Workplace injury records in Mason City, IA
203 establishments in Mason City filed an OSHA Form 300A summary at least once between 2016 and 2025. The largest industries here: Health Care and Social Assistance (39), Manufacturing (31), Retail Trade (30). 87 had 30 to 200 employees at their latest filing.
| Establishment | Industry | Avg. employees (last filing) | Years filed | TRIR (last filing) | Industry median TRIR |
|---|---|---|---|---|---|
| "MASON CITY IA - 3094" "Menards" | "Home Centers" | 170 | 2018–2025 · 7 | 3.39 | 2.10 |
| 02480 STORE 02480 Dollar Tree Stores Inc. STORE 02480 | All Other General Merchandise Retailers | 23 | 2018–2024 · 3 | 0.00 | 0.00 |
| 056 Mason City IA Barnhart Crane and Rigging LLC Barnhart Crane and Rigging LLC | Crane and rigging | 23 | 2023–2025 · 3 | 3.96 | 0.00 |
| 056 Mason City IA Barnhart Plant Services LLC Barnhart Plant Services LLC | Crane and rigging | 23 | 2023–2025 · 2 | 0.00 | 0.00 |
| 056 Mason City IA Crane Sales and Service LLC Crane Sales and Service LLC | Crane and rigging | 23 | 2023–2025 · 3 | — | 0.00 |
| 056 Mason City IA Barnhart Energy Co LLC FKA Barnhart Engineers and Contractors LLC Barnhart Energy Co LLC FKA Barnhart Engineers and Contractors LLC | Crane rental with operator | 19 | 2023 · 1 | — | 0.00 |
| 056 Mason City IA Barnhart Northeast Inc Barnhart Northeast Inc | Crane rental with operator | 19 | 2023 · 1 | — | 0.00 |
| 068-MSI Dayton Freight Lines Inc. | Transportation | 8 | 2022–2025 · 4 | 11.43 | 2.83 |
| 0705601 Mason City Drugstore - Main Store HY-VEE, INC. | Supermarkets and Other Grocery (except Convenience) Stores | 51 | 2022 · 1 | 0.00 | 4.52 |
| 0804 - Mason City Target | Discount Department Stores | 226 | 2019–2025 · 5 | 2.64 | 2.13 |
| 0804 - Mason City Target | — | 252 | 2023 · 1 | 9.33 | 2.92 |
| 0854 - MASON CITY, IA Harbor Freight Tools, Inc | Retail Stores | 15 | 2017–2018 · 2 | 28.10 | 6.26 |
| 185760-MASON CITY PO US Postal Service | Mail and Parcel Delivery | 65 | 2017–2022 · 6 | 21.02 | 9.22 |
| 2044-20440019-51014 Coca-Cola | Other grocery and related products merchant wholesalers | 96 | 2016 · 1 | 2.09 | 2.79 |
| 24 - Mason City The Martin-Brower Company LLC | — | 98 | 2017–2025 · 9 | 6.26 | 3.31 |
| 38 Ashley HomeStore Furniture Mart | FurnitureRetail | 14 | 2023–2024 · 2 | 0.00 | 0.00 |
| 4186-08598 Dollar Tree | Dollar Stores | 27 | 2021 · 1 | 0.00 | 0.00 |
| 4223-M2900 | All Other General Merchandise Stores | 127 | 2018–2023 · 5 | 5.11 | 5.17 |
| 504 FedEx Ground Package System, Inc. | Couriers and express delivery services | 27 | 2016–2018 · 3 | 21.75 | 8.04 |
| 550502 Iowa Department of Transportation | 2 | 55 | 2017 · 1 | 0.00 | 0.16 |
| 57033 Adapt Health LLC | Medical | 6 | 2022 · 1 | 0.00 | 0.00 |
| 577 Mason City, IA Batteries Plus Bulbs | All Other Miscellaneous Store Retailers (except Tobacco Stores) | 4 | 2018 · 1 | 0.00 | 0.00 |
| 80001002-ZMSN G-MASON CITY FEDEX GROUND | Courier and Express Delivery Services | 43 | 2019–2023 · 5 | 18.80 | 8.29 |
| 80001021-MACI MASON CITY-G504 FEDERAL EXPRESS CORPORATION | Courier and Express Delivery Services | 52 | 2024–2025 · 2 | 7.79 | 7.17 |
| 995 MASON CITY Kohls Inc. | — | 46 | 2016–2025 · 9 | 12.41 | 2.56 |
| AERON Advanced Manufacturing | Septic tanks, plastics or fiberglass, manufacturing | 70 | 2019–2025 · 3 | 12.31 | 1.96 |
| Aeron Advanced MFG | Airfreshners manufacturing | 38 | 2016–2018 · 3 | 23.97 | 1.72 |
| Ag Processing Inc | Soybean oil, crude, manufacturing | 39 | 2016–2025 · 10 | 2.41 | 2.23 |
| All For One # 755 MASON CITY, IA | Retail Other | — | 2016 · 1 | — | 3.91 |
| Alter Metal Recycling - Behr Iron - Mason City Alter Trading | General-line scrap merchant wholesalers | 19 | 2016–2023 · 5 | 4.59 | 1.60 |
| AP IA CEN Mason City IEH Auto Parts, LLC | Motor Vehicles parts & Supplies"" | 77 | 2017–2018 · 2 | 5.52 | 3.28 |
| ASSA ABLOY WOOD DOORS ASSA ABLOY | Doors, wood and covered wood, manufacturing | 208 | 2016 · 1 | 13.14 | 5.58 |
| ASSA ABLOY Wood Doors - Graham Masonite | Door frames and sash, wood and covered wood, manufacturing | 219 | 2017–2018 · 2 | 8.55 | 5.40 |
| Auto Plus Mason City IEH Auto Parts, LLC | Auto body shop supplies, merchant wholesalers | 53 | 2016 · 1 | 2.01 | 3.42 |
| B&E FRANCHISES INC dba AMERICAN INDUSTRIAL Peoplease | — | 9 | 2022 · 1 | 0.00 | 0.00 |
| Big Lots Store # 1256 MASON CITY, IA | Retail Other | — | 2016 · 1 | — | 3.91 |
| BLAZEK ELECTRIC, INC | Low voltage electrical work | 27 | 2018 · 1 | 0.00 | 2.26 |
| Bushel Boy - Mason City Bushel Boy | Tomato farming, grown under cover | 61 | 2021–2024 · 4 | 13.39 | 2.96 |
| CC Mason City Covenant Medical Center | Ofcs of Physicians Exc mental hlth | 4 | 2016 · 1 | 0.00 | 1.16 |
| Cerro Gordo County Extension Iowa State University | Colleges, universities, and professional schools | 9,558 | 2016 · 1 | 0.00 | 1.03 |
| Church & Dwight | Blending animal feed | 37 | 2023 · 1 | 3.89 | 1.93 |
| Church & Dwight Manufacturing Mason City Iowa Church & Dwight Manufacturing Inc. | Feed supplements, animal (except cat, dog), manufacturing | 35 | 2022 · 1 | 0.00 | 2.79 |
| Church Dwight Mason City Church & Dwight | Livestock feeds, supplements, concentrates and premixes, manufacturing | 41 | 2024–2025 · 2 | 4.56 | 1.73 |
| City of Mason City | Executive and legislative office combinations | 353 | 2016–2025 · 10 | 6.41 | 0.39 |
| Country Meadow Place Country Meadow Place, LLC | Assisted-living facilities without on-site nursing care facilities | 41 | 2017–2025 · 7 | 7.29 | 4.90 |
| Courthouse Cerro Gordo County | Executive offices, federal, state, and local (e.g., governor, mayor, president) | 70 | 2016–2025 · 10 | 1.65 | 0.39 |
| Crescent Park Corporation - M2 Crescent Park | Warehouse clubs (i.e., food and general merchandise) | 20 | 2017–2025 · 9 | 0.00 | 0.00 |
| Croell Inc. - Mason City Croell Inc. | Ready-mix concrete manufacturing and distributing | 27 | 2017–2019 · 3 | 20.11 | 3.56 |
| CURRIES ASSA ABLOY | Windows, metal, manufacturing | 743 | 2016–2025 · 7 | 3.46 | 2.71 |
| Dealerbuilt | Applications software programming services, custom computer | 98 | 2017–2018 · 2 | 0.95 | 0.00 |
| Dimensional Graphics Corp | Looseleaf binders and devices manufacturing | 40 | 2016–2025 · 4 | 0.00 | 1.35 |
| Eggs-Mason City IA Cargill | Eggs, processed, manufacturing | 282 | 2016–2025 · 10 | 3.68 | 2.22 |
| Engineer Admin Building Cerro Gordo County | General public administration | 15 | 2022–2025 · 4 | 7.53 | 0.39 |
| FAR 47 ALDI INC. | — | 20 | 2020 · 1 | 0.00 | 4.24 |
| FAREWAY STORES, INC. 491 MASON CITY FAREWAY STORES, INC. | Grocery stores | 74 | 2020–2025 · 4 | 2.53 | 3.16 |
| Forte Opening Solutions IBP Solutions | Doors, wood and covered wood, manufacturing | 131 | 2024 · 1 | 5.58 | 4.00 |
| Fortrex - 0096 Smithfield Packaged Meats Corp. - Mason City Fortrex | Janitorial Services | 19 | 2017–2025 · 7 | 0.00 | 0.00 |
| FRC Component Products | Capacitors, electronic, fixed and variable, manufacturing | 74 | 2022–2025 · 4 | 6.40 | 0.23 |
| Golden Grain Energy LLC | Denatured alcohol manufacturing | 55 | 2017–2025 · 9 | 1.84 | 0.00 |
| Good Shepherd Geriatric Center | Nursing homes | 236 | 2016–2025 · 6 | 2.37 | 4.17 |
| Hampton Inn & Suites Mason City | Hotels (except casino hotels) | 22 | 2016–2025 · 10 | 0.00 | 2.90 |
| Headwater Development, LLC (HPIH) Stoney Creek Hospitality Corporation | Hotels (except casino hotels) | 25 | 2023–2024 · 2 | 0.00 | 2.81 |
| Heartland Asphalt, Inc. | Pavement, highway, road, street, bridge or airport runway, construction | 62 | 2016–2025 · 9 | 2.75 | 1.05 |
| Henkel Construction Company | Commercial building construction | 32 | 2017–2025 · 8 | 0.00 | 0.00 |
| Henkel General Construction, LLC | Commercial building construction | 93 | 2021–2025 · 4 | 1.21 | 0.00 |
| Heritage Care and Rehabilitation Center ABCM COrporation | Skilled nursing facilities | 86 | 2016–2024 · 9 | 2.33 | 4.70 |
| Hosmer Honda | Automobile dealers, new only or new and used | 19 | 2017–2018 · 2 | 0.00 | 3.09 |
| Hosmer Toyota | Automobile dealers, new only or new and used | 36 | 2017–2018 · 2 | 0.00 | 3.09 |
| HPI Partners Stoney Creek Hospitality | Hotels (except casino hotels) | 21 | 2016–2021 · 4 | 0.00 | 2.82 |
| HUBER SUPPLY COMPANY INC. MASON CITY, IA HUBER SUPPLY COMPANY INC. | Gases, compressed and liquefied (except liquefied petroleum gas), merchant wholesalers | 25 | 2019 · 1 | 0.00 | 0.00 |
| IA-Mason City-389-YRC Freight YRC Freight | Freight Trucking lTL | 4 | 2019–2023 · 3 | 25.00 | 2.81 |
| IAMAS Fastenal Company | Hardware Merchant Wholesalers | 7 | 2016–2017 · 2 | 0.00 | 0.00 |
| IAMAS - MASON CITY UPS | Couriers and Express Delivery Services | 90 | 2019–2025 · 7 | 7.97 | 7.17 |
| IOOF HOME AND COMMUNITY THERAPY CENTER IOOF HOME | Skilled nursing facilities | 105 | 2016–2017 · 2 | 27.07 | 5.78 |
| IOOF HOME AND CPMMUNITY THERAPY CENTER IOOF HOME AND COMMUNITY THERAPY CENTER | Nursing homes | 107 | 2021 · 1 | 8.84 | 7.06 |
| Iowa DOT - District 2 Maintenance Iowa Department of Transportation | Government - Transportation | 50 | 2019–2022 · 4 | 0.00 | 0.00 |
| Kraft Heinz Mason City Kraftheinz Foods | Puddings, canned dessert, manufacturing | 176 | 2024–2025 · 2 | 2.25 | 2.22 |
| KraftHeinz Mason City Iowa Kraft Heinz | Puddings, dessert, manufacturing | 1,545 | 2017–2019 · 3 | — | 3.24 |
| Leeds West Groups - IA Big O Mason City - 5019 Leeds West Groups | Automotive Repair | 8 | 2023–2024 · 2 | 0.00 | 0.00 |
| Linden House Access Inc | Homes with or without health care, intellectual and developmental disability | 5 | 2017–2019 · 3 | 0.00 | 2.33 |
| MAC-ODFL Old Dominion Freight Line Inc | General Freight Trucking, long-distance, LTL | 20 | 2021 · 1 | 12.89 | 2.50 |
| MAC-ODFL Old Dominion Freight Line Inc | General Freight Trucking, long-distance, LTL | 20 | 2021 · 1 | 12.89 | 2.50 |
| Mason City Ziegler | Construction machinery and equipment merchant wholesalers | 51 | 2016–2022 · 7 | 3.70 | 0.00 |
| Mason City Dohrn Transfer Company | — | 25 | 2016–2025 · 3 | 6.40 | 2.83 |
| Mason City LaRue Distributing, Inc. | Coffee merchant wholesalers | 2 | 2017 · 1 | 0.00 | 4.52 |
| MASON CITY McLane Company Inc | General Line Grocery | 45 | 2018–2024 · 7 | 0.00 | 3.45 |
| Mason City | MANUFACTURED ICE | — | 2021 · 1 | — | 3.67 |
| Mason City VAN-WALL EQUIPMENT INC | 423820 Farm and Garden Machinery and Equipment Merchant Wholesalers | 28 | 2021–2025 · 5 | 3.61 | 0.00 |
| Mason City Midwest Motor Express Inc. | Trucking | 7 | 2022 · 1 | 12.47 | 2.54 |
| Mason City RC Dermatology | Dermatologists' offices (e.g., centers, clinics) | 4 | 2025 · 1 | 0.00 | 0.00 |
| Mason City Forte Opening Solutions | Doors, wood and covered wood, manufacturing | 58 | 2025 · 1 | 1.70 | 3.26 |
| Mason City EmpWorkCtrCd 30000493 ROLLING FRITO LAY SALES | Confectionery Merchant Wholesalers | 10 | 2024 · 1 | 0.00 | 3.45 |
| MASON CITY (IAMAS) United Parcel Service | Courier Services Except by Air | 83 | 2016–2018 · 3 | 4.90 | 8.04 |
| Mason City (MAS) BASELINE FITNESS | 713940 Fitness and Recreational Sports Centers | 12 | 2022–2025 · 4 | 0.00 | 0.00 |
| MASON CITY - 3094 Menard, Inc | — | 179 | 2016 · 1 | 5.06 | 5.64 |
| Mason City - CULVER - 4435 Consolidated Electrical Distributors Inc | Electrical Apparatus and Equipment, Wiring Supplies, and Related Equipment Merchant Wholesalers | 20 | 2016–2025 · 10 | 0.00 | 0.00 |
| Mason City 1 - Main Store HY-VEE, INC. | Supermarkets and Other Grocery except Convenience Stores | 162 | 2022–2025 · 4 | 3.87 | 3.16 |
| MASON CITY 18047 Auto Plus Auto Parts | Warehousing and storage | 45 | 2022 · 1 | 6.78 | 2.47 |
| Mason City 2 - Main Store HY-VEE, INC. | Supermarkets and Other Grocery except Convenience Stores | 182 | 2022–2025 · 4 | 5.78 | 3.16 |
| MASON CITY 35TH STREET FIVE STAR COOPERATIVE | Grain elevators merchant wholesalers grain | 19 | 2017 · 1 | 5.46 | 0.00 |
| Mason City 619 McLane | distribution of a general line (wide range) of groceries | 28 | 2025 · 1 | 5.49 | 3.31 |
| Mason City Branch Atlantic Bottling Company | Beverages, soft drink (including artificially carbonated waters), manufacturing | 69 | 2016–2025 · 10 | 1.57 | 2.89 |
| MASON CITY CLINIC, P.C. | MDs' (medical doctors), mental health, offices (e.g., centers, clinics) | 228 | 2017 · 1 | 4.23 | 1.48 |
| Mason City Crest Services American Baptist Homes of the Midwest | Group homes, intellectual and developmental disability | 6 | 2025 · 1 | 0.00 | 0.00 |
| Mason City Drugstore - Main Store HY-VEE, INC. | Supermarkets and Other Grocery except Convenience Stores | 50 | 2022–2025 · 4 | 0.00 | 3.16 |
| Mason City EmpWorkCtrCd 30000493 Rolling Frito Lay Sales | Confectionery Merchant Wholesalers | 9 | 2025 · 1 | 0.00 | 3.31 |
| MASON CITY IA PEPSICO BEV SALES | Other Grocery and Related Products Merchant Wholesalers | 29 | 2016–2025 · 10 | 8.97 | 3.31 |
| MASON CITY IA - 3094 Menard | — | 181 | 2020 · 1 | 1.50 | 4.67 |
| MASON CITY IA 121-460 AEROCARE EMPLOYEE BENEFITS INC | Medical | 9 | 2021 · 1 | 0.00 | 0.00 |
| Mason City IA Caregiving LLC Cornerstone Caregiving East LLC | Home health care agencies | 1 | 2025 · 1 | — | 1.04 |
| Mason City IA FXFE-MCW FedEx Freight | Less Than Truckload General Freight Trucking | 28 | 2016–2025 · 7 | 3.94 | 2.83 |
| Mason City IA FXFE-MCW FedEx Freight | Less Than Truckload General Freight Trucking | 30 | 2023 · 1 | 7.16 | 2.81 |
| Mason City IA Lumber Builders Firstsource Inc | Other Building Materials Dealers | 11 | 2016 · 1 | 0.00 | 5.64 |
| MASON CITY IA SALES CENTER Bimbo Bakeries USA Inc | Private warehousing and storage general merchandise | 10 | 2024 · 1 | 19.39 | 1.74 |
| Mason City IA Site Mediacom | Telecommunications carriers, wired | 24 | 2016–2025 · 10 | 7.99 | 0.36 |
| Mason City IA Skilled Nursing Facility LLC D/B/A Heritage Health and Rehab Center Mason City IA Skilled Nursing Facility | Homes for the elderly with nursing care | 88 | 2025 · 1 | 3.82 | 4.17 |
| Mason City IA Skilled Nursing Facility LLC dba Heritage Health and Rehab Center | Skilled nursing facilities | 88 | 2024–2025 · 2 | 3.82 | 4.17 |
| Mason City IA Yard Builders FirstSource | Other Building Material Dealers | 8 | 2023–2025 · 3 | 0.00 | 2.10 |
| MASON CITY IA_1372088 | Mail and Parcel Delivery | 59 | 2023–2025 · 3 | 6.58 | 6.06 |
| Mason City Office Principal Financial Group | Life insurance carriers, direct | 303 | 2017–2018 · 2 | 0.67 | 0.00 |
| Mason City Operations | — | 52 | 2016–2025 · 10 | 1.93 | 0.00 |
| Mason City Plant Stellar Industries | Manufacturing of truck equipment and Trailers | 61 | 2025 · 1 | 3.93 | 2.73 |
| Mason City Red Power Bancroft Implement Inc | Agricultural machinery and equipment merchant wholesalers | 35 | 2024 · 1 | 5.02 | 0.00 |
| Mason City Tire Center | Tire Dealers | 7 | 2016–2022 · 6 | 0.00 | 4.67 |
| Mason City, IA Hirschbach Motor Lines, Inc | General freight trucking, long-distance, truckload (TL) | 5 | 2023 · 1 | 0.00 | 2.81 |
| MASON CITY, IA #00854 Harbor Freight Tools | Retail Hardware Stores | 11 | 2019–2025 · 7 | 0.00 | 2.10 |
| Mason City, IA - 1609 19th St SW J.B. Hunt Transport | — | — | 2021–2022 · 2 | — | 2.54 |
| Mason City, IA - 57035 Adapt Health LLC | 5047 | 9 | 2025 · 1 | 12.09 | 0.00 |
| Masonite - Mason City Masonite | Doors, wood and covered wood, manufacturing | 197 | 2022–2023 · 2 | 1.73 | 4.41 |
| McKiness Excavating, Inc. Bob McKiness Excavating & Grading, Inc. | Utility line (i.e., sewer, water), construction | 18 | 2016–2025 · 10 | 5.15 | 0.16 |
| MCW FedEx Freight Inc. | General freight trucking, long-distance, less-than-truckload (LTL) | 35 | 2017–2018 · 2 | 2.92 | 4.21 |
| Mechancial Air Systems Co | HVAC | 21 | 2017–2025 · 7 | 0.00 | 1.10 |
| MED-TRANS MERCY AIR MED - Operations Air Medical Group Holdings | Medical Transport | 4 | 2018 · 1 | 0.00 | 3.10 |
| MEDTRANS MERCY AIR MED Operations Global Medical Response Inc | Medical Transport | 4 | 2019 · 1 | 0.00 | 0.00 |
| Mercy Dermatology Center MercyOne North Iowa Medical Center | Dermatologists' offices (e.g., centers, clinics) | 20 | 2016–2023 · 7 | 5.32 | 0.00 |
| Mercy Family Clinic - Bariatric Center Mercy Medical Center - North Iowa | MDs' (medical doctors, except mental health) offices (e.g., centers, clinics) | 2 | 2016 · 1 | 0.00 | 1.16 |
| Mercy Family Clinic - Women's Health Center Mercy Medical Center - North Iowa | Gynecologists' offices (e.g., centers, clinics) | 20 | 2016–2018 · 3 | 0.00 | 1.15 |
| Mercy Medical Center North Iowa-West Campus-Including Pediatric Clinic-MHS-IA/NE MercyOne North Iowa Medical Center | Skilled nursing facilities | 210 | 2016–2025 · 9 | 1.90 | 4.17 |
| Mercy Medical Center-Mason City-MHS-IA/NE MercyOne North Iowa Medical Center | General medical and surgical hospitals | 1,621 | 2016–2025 · 8 | 4.11 | 4.08 |
| Mercy Vascular & Wound Center | MDs' (medical doctors, except mental health) offices (e.g., centers, clinics) | 18 | 2017–2018 · 2 | 0.00 | 1.15 |
| MercyOne Cheslea Creek Rehab MercyOne North Iowa Medical Center | Physical therapy offices (e.g., centers, clinics) | 24 | 2016–2023 · 7 | 50.06 | 0.00 |
| MercyOne Family Clinic - Diabetes Center MercyOne North Iowa Medical Center | Medical doctors' (MDs, except mental health) offices (e.g., centers, clinics) | 20 | 2016–2023 · 6 | 0.00 | 0.00 |
| MercyOne Family Clinic - Forest Park MercyOne North Iowa Medical Center | Family physicians' offices (e.g., centers, clinics) | 61 | 2016–2023 · 7 | 0.00 | 0.00 |
| MercyOne Family Clinic - Internal Medicine MercyOne North Iowa Medical Center | Family physicians' offices (e.g., centers, clinics) | 25 | 2016–2023 · 7 | 0.00 | 0.00 |
| MercyOne Family Clinic - Internal Medicine MercyOne North Iowa Medical Center | Family physicians' offices (e.g., centers, clinics) | 49 | 2019 · 1 | 2.94 | 0.76 |
| MercyOne Family Clinic - Mason City Pediatric & Adolescent MercyOne North Iowa Medical Center | Family physicians' offices (e.g., centers, clinics) | 23 | 2019 · 1 | 12.38 | 0.76 |
| MercyOne Family Clinic - Obstetrics and Gynecology MercyOne North Iowa Medical Center | Obstetricians' offices (e.g., centers, clinics) | 25 | 2016–2023 · 5 | 0.00 | 0.00 |
| MercyOne Family Clinic - Obstetrics and Gynecology MercyOne North Iowa Medical Center | Obstetricians' offices (e.g., centers, clinics) | 27 | 2019 · 1 | 8.52 | 0.76 |
| MercyOne Family Clinic - Regency MercyOne North Iowa Medical Center | Family physicians' offices (e.g., centers, clinics) | 29 | 2016–2023 · 7 | 0.00 | 0.00 |
| MercyOne Family Clinic - Residency MercyOne North Iowa Medical Center | Family physicians' offices (e.g., centers, clinics) | 26 | 2016–2023 · 6 | 0.00 | 0.00 |
| MercyOne Family Clinic - Residency MercyOne North Iowa Medical Center | Family physicians' offices (e.g., centers, clinics) | 43 | 2019 · 1 | 0.00 | 0.76 |
| MercyOne Family Clinic - Womens' Health Center MercyOne North Iowa Medical Center | Gynecologists' offices (e.g., centers, clinics) | 19 | 2019 · 1 | 0.00 | 0.76 |
| MercyOne Heart Center MercyOne North Iowa Medical Center | Cardiologists' offices (e.g., centers, clinics) | 69 | 2017–2021 · 4 | 0.00 | 0.00 |
| MercyOne Home Care MercyOne North Iowa Medical Center | Home health care agencies | 51 | 2016–2023 · 7 | 0.00 | 1.09 |
| MercyOne North Iowa Hospice MercyOne North Iowa Medical Center | Hospices, inpatient care | 37 | 2016–2023 · 7 | 7.86 | 5.00 |
| MercyOne North Iowa Medical Center | General medical and surgical hospitals | 1,652 | 2019 · 1 | 6.58 | 4.70 |
| MercyOne North Iowa Medical Center West MercyOne North Iowa Medical Center | Skilled nursing facilities | 118 | 2019 · 1 | 6.34 | 5.44 |
| MercyOne Textile Services MercyOne North Iowa Medical Center | Cooperative hospital laundries (i.e., linen supply services) | 28 | 2016–2023 · 7 | 10.61 | 2.24 |
| MH Mason City | Forklift repair and maintenance services | 24 | 2019–2025 · 7 | 4.82 | 0.42 |
| Mid-West Roofing Company | Roofing Contractor | 29 | 2016–2018 · 3 | 15.73 | 3.45 |
| MN Rubber & Plastics - Mason City Quadion LLC | Extruded, molded or lathe-cut rubber goods manufacturing | 35 | 2016–2020 · 5 | 0.00 | 2.53 |
| Nassco Inc - Mason City Nassco Inc | Janitorial equipment and supplies merchant wholesalers | 9 | 2024–2025 · 2 | 0.00 | 0.00 |
| North Iowa Community Action Organization | Accident prevention associations | 139 | 2021 · 1 | 0.00 | 1.30 |
| North Iowa Cooperative - Portland North Iowa Cooperative | Soybeans merchant wholesalers | 25 | 2016–2025 · 10 | 17.51 | 0.00 |
| North Iowa Cooperative-DBA United LP Co. | Oil, petroleum, merchant wholesalers (except bulk stations, terminals) | 4 | 2016–2025 · 10 | 0.00 | 0.00 |
| Nutra Blend Mason City | Feed premixes, animal, manufacturing | 31 | 2022 · 1 | 17.69 | 2.79 |
| Nutra Blend Mason City | Grain grinding, custom, for animal feed | 34 | 2024–2025 · 2 | 0.00 | 1.73 |
| OP MASON CITY, LLC | BUILDINGS OPERATION BY CONTRACTORS | — | 2025 · 1 | — | 0.00 |
| Oro Valley AG Services LLC - Mason City oro | Farm labor contractors | 12 | 2023 · 1 | 0.00 | 1.82 |
| Plumb Supply Company - Mason City Plumb Supply Company | Plumbing and heating valves merchant wholesalers | 27 | 2022–2024 · 3 | 18.15 | 0.00 |
| PSSI / SMITHFIELD PACKAGED MEATS CORP. - MASON CITY PSSI Holdings LLC | Building Maintenance Services | 25 | 2018 · 1 | 0.00 | 2.64 |
| Public Health Cerro Gordo County | Community health programs administration | 37 | 2016–2025 · 10 | 0.00 | 0.00 |
| REG Mason City, LLC Chevron Renewable Energy Group | Transesterification of vegetable oils to produce fuels or fuel additives | 36 | 2016–2025 · 10 | 0.00 | 0.00 |
| S03170 - IA Mason City WM | — | 21 | 2020–2025 · 5 | 10.67 | 2.86 |
| S03170 - WM of Southern MN - Mason City WM Corp | — | 34 | 2016–2019 · 4 | 4.23 | 4.27 |
| Satellite Peds Cardiology Covenant Medical Center | Physicians' (except mental health) offices (e.g., centers, clinics) | 4 | 2022 · 1 | 0.00 | 0.00 |
| SCI Columbia, LLC Stoney Creek Hospitality Corporation | Hotels (except casino hotels) | 35 | 2023–2024 · 2 | 6.76 | 2.81 |
| SCI Des Moines, LLC Stoney Creek Hospitality Corporation | Hotels (except casino hotels) | 34 | 2023–2024 · 2 | 0.00 | 2.81 |
| SCI East Peoria, LLC Stoney Creek Hospitality Corporation | Hotels (except casino hotels) | 29 | 2023–2024 · 2 | 0.00 | 2.81 |
| SCI Galena, LLC Stoney Creek Hospitality Corporation | Hotels (except casino hotels) | 18 | 2023–2024 · 2 | 7.38 | 2.81 |
| SCI La Crosse Onalaska, LLC Stoney Creek Hospitality Corporation | Hotels (except casino hotels) | 38 | 2023–2024 · 2 | 12.83 | 2.81 |
| SCI Moline, LLC Stoney Creek Hospitality Corporation | Hotels (except casino hotels) | 35 | 2023–2024 · 2 | 13.94 | 2.81 |
| SCI Quincy, LLC Stoney Creek Hospitality Corporation | Hotels (except casino hotels) | 15 | 2023–2024 · 2 | 8.72 | 2.81 |
| SCI Sioux City, LLC Stoney Creek Hospitality Corporation | Hotels (except casino hotels) | 45 | 2023–2024 · 2 | 3.75 | 2.81 |
| SCI St Joseph, LLC Stoney Creek Hospitality Corporation | Hotels (except casino hotels) | 26 | 2023–2024 · 2 | 0.00 | 2.81 |
| SEH - Mason City Short Elliott Hendrickson Inc. | Engineering Services | 11 | 2021–2025 · 5 | 9.13 | 0.00 |
| Sheriff's Department Cerro Gordo County | Jails (except private operation of) | 76 | 2016–2025 · 10 | 9.14 | 3.68 |
| Shopko Store #52 (Mason City, IA) Shopko Stores Operating Company LLC | Department Stores | 63 | 2016–2018 · 3 | 5.14 | 2.16 |
| Smithfield Foods | Meat products canning (except baby, pet food, poultry) made from purchased carcasses | 205 | 2016–2025 · 8 | 6.95 | 2.90 |
| SPEE DEE DELIVERY SERVICE, INC - MASON CITY SPEE DEE DELIVERY SERVICE, INC | Delivery service (except as part of intercity carrier network, U.S. Postal Service) | 58 | 2016–2023 · 8 | 4.98 | 9.08 |
| Stellar Industries Mason City North Stellar Industries | Boxes, truck (e.g., cargo, dump, utility, van), assembled on purchased chassis | 61 | 2021–2025 · 5 | 3.93 | 4.42 |
| Stellar Truck and Trailer | Installation of Truck Equipment | 47 | 2016–2025 · 9 | 13.30 | 2.73 |
| Stoney Creek Hospitality Stoney Creek Hospitality Corporation | Hotels (except casino hotels) | 18 | 2016–2024 · 7 | 0.00 | 2.81 |
| Stoney Creek Investors of Broken Arrow Stoney Creek Hospitality Corporation | Hotels (except casino hotels) | 55 | 2023–2024 · 2 | 18.29 | 2.81 |
| Stoney Creek Investors of Independence Stoney Creek Hospitality Corporation | Hotels (except casino hotels) | 55 | 2023–2024 · 2 | 0.00 | 2.81 |
| Taco Bell - 26758 Timberline Management, Inc. | Fast-food restaurants | 16 | 2016 · 1 | 0.00 | 3.19 |
| Torgerson-Thompson and Co Stoney Creek Hospitality | Hotels (except casino hotels) | 1 | 2016–2021 · 4 | 0.00 | 2.82 |
| VS Inc - IA Visu-Sewer, LLC | Construction management, water and sewer line | 5 | 2023–2025 · 3 | 0.00 | 0.16 |
| WM 810 Walmart Inc. | Warehouse Clubs and Supercenters | 361 | 2016–2025 · 10 | 3.81 | 4.92 |
| Woodharbor Molding & Millwork | Cabinets, kitchen (except freestanding), stock or custom wood, manufacturing | 185 | 2016–2017 · 2 | — | 3.77 |
| Woodharbor Molding & Millworks, LLC Woodharbor Molding & Millworks, Inc. | Cabinets, kitchen (except freestanding), stock or custom wood, manufacturing | 191 | 2018–2023 · 3 | 3.23 | 3.20 |
| Younkers Bonton | Department stores (except discount department stores) | 67 | 2016 · 1 | 0.00 | 2.55 |
| Z'mariks Noodle Cafe | Family restaurants, limited-service | 51 | 2017–2018 · 2 | 12.97 | 3.03 |
Alphabetical order — this site ranks no one. TRIR = recordable cases × 200,000 ÷ hours worked, for the latest year the establishment filed. The industry median is that of establishments filing with OSHA in the same 4-digit NAICS industry and year; a median of 0.00 means that at least half of them recorded no case that year. Select a name for the full year-by-year record. How to read this.