Transportation Services, Not Elsewhere Classified
1,475 companies
SIC 4789
Companies in Ontario
Behind every street in Ontario sits a business. 34,288 of them, to be exact, all registered in the United States business register. The biggest single industry is Transportation Services, Not Elsewhere Classified with 1,475 companies, roughly 4% of everything that does business in the city.
34,288 businesses indexed
Prime Healthcare Services INCPrime Healthcare Services INC
| Company Name | Country | City | Address 1 | State/Province | Postal Code | Website | Founding Year | Yearly Revenue in U.S. Dollars | Employees Total | Business Legal Type - Description | Number of Companies in Group | Company Registration Number | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Prime Healthcare Services INC | USA | Ontario | 3480 E Guasti Rd | San Diego | 91761-7684 | primehealthcare.***** | 2000 | $4,254,080,590 | 3,720 | Corporation | 170 | 3201141 |
| 2 | Prime Healthcare Foundation, INC. | USA | Ontario | 3480 E Guasti Rd | San Diego | 91761-7684 | primehealthcare.***** | 2006 | $776,307,206 | 10,500 | Corporation | 170 | 4267566 |
| 3 | Citizens Business Bank, National Association | USA | Ontario | 701 N Haven Ave Ste 280 | San Diego | 91764-4920 | cbbank.***** | 1973 | $712,405,000 | 1,053 | Corporation | 86 | 0704881 |
| 4 | Cvb Financial CORP. | USA | Ontario | 701 N Haven Ave Ste 350 | San Diego | 91764-4920 | cbbank.***** | 1974 | $648,472,000 | 1,079 | Corporation | 86 | 1042528 |
| 5 | City Of Ontario | USA | Ontario | 303 E B St | San Diego | 91764-4196 | ontarioca.***** | 1891 | $616,940,755 | 1,053 | Corporation | 27 | N/A |
| 6 | Ajinomoto Foods North America, INC. | USA | Ontario | 4200 Concours Ste 100 | San Diego | 91764 | ajinomotofoods.***** | 2024 | $610,528,935 | 2,800 | Corporation | 393 | 90561698 |
| 7 | New-Indy Jv CORP. | USA | Ontario | 3500 Porsche Way Ste 150 | San Diego | 91764-4969 | newindycontainerboard.***** | 2014 | $600,005,928 | 500 | Corporation | 26 | 5656922 |
| 8 | Z Squad LLC | USA | Ontario | 2910 S Archibald Ave Ste 426 | San Diego | 91761-7323 | N/A | 2021 | $543,000,000 | 1 | Corporation | N/A | 202130910884 |
| 9 | Chaffey Joint Union High School District | USA | Ontario | 211 W 5th St | San Diego | 91762-1698 | cjuhsd.***** | 1958 | $508,986,289 | 2,000 | Corporation | 14 | 956000560 |
| 10 | Ontario-Montclair School District | USA | Ontario | 950 W D St | San Diego | 91762 | omsd.***** | 1884 | $462,328,139 | 2,114 | Corporation | 39 | 2000443 |
| 11 | Heritage Grocers Group, LLC | USA | Ontario | 2501 E Guasti Rd | San Diego | 91761-7657 | heritagegrocersgroup.***** | 2016 | $329,695,434 | 8,531 | Corporation | 64 | 6165486 |
| 12 | Gold Star Foods, INC. | USA | Ontario | 2855 E Guasti Rd Ste 600 | San Diego | 91761-1250 | goldstarfoods.***** | 2019 | $329,251,469 | 270 | Corporation | 24 | 4435085 |
| 13 | Prime Healthcare Management, INC. | USA | Ontario | 3480 E Guasti Rd | San Diego | 91761-7684 | primehealthcare.***** | 2004 | $209,185,072 | 10,495 | Corporation | 22 | 2578229 |
| 14 | Test-Rite Products CORP. | USA | Ontario | 1900 Burgundy Pl | San Diego | 91761-2308 | testritegroup.***** | 1975 | $183,803,432 | 176 | Corporation | 40 | 2266568 |
| 15 | Test-Rite International (U.S.) CO., LTD. | USA | Ontario | 1900 Burgundy Pl | San Diego | 91761-2308 | testritegroup.***** | 1991 | $183,803,432 | 176 | Corporation | 40 | 2266791 |
| 16 | Avita Ontario Hospital, LLC | USA | Ontario | 715 Richland Mall | Richland | 44906-3802 | wexnermedical.***** | 2018 | $131,161,585 | 39 | Corporation | N/A | 2416889 |
| 17 | Ontario International Airport Authority | USA | Ontario | 1923 E Avion Ave | San Diego | 91761-7720 | flyontario.***** | 2016 | $125,058,556 | 128 | Corporation | N/A | N/A |
| 18 | Hci Systems, INC. | USA | Ontario | 1219 E Elm St | San Diego | 91761-4585 | hcisystems.***** | 2008 | $122,035,480 | 50 | Corporation | 6 | 3072097 |
| 19 | Taylored Services Holdings, LLC | USA | Ontario | 1495 E Locust St | San Diego | 91761-4570 | tayloredservices.***** | 2023 | $118,567,518 | 520 | Corporation | 888 | 4510169 |
| 20 | Taylored Services, LLC | USA | Ontario | 1495 E Locust St | San Diego | 91761-4570 | tayloredservices.***** | 1992 | $104,153,301 | 520 | Corporation | 888 | 4532013 |
| 21 | Jacks Torin INC | USA | Ontario | 4355 E Brickell St | San Diego | 91761-3700 | torinjacks.***** | 1993 | $99,260,608 | 35 | Corporation | N/A | 1723350 |
| 22 | Tropicale Foods, LLC | USA | Ontario | 1237 W State St | San Diego | 91762-4015 | tropicalefoods.***** | 1999 | $97,514,393 | 150 | Corporation | 5 | 201933110071 |
| 23 | Mnx Global Logistics CORP. | USA | Ontario | 1754 E Cedar St Ste A | San Diego | 91761-8059 | mnx.***** | 2023 | $94,141,190 | 500 | Corporation | 3289 | 2236699 |
| 24 | Ashtel Studios, INC | USA | Ontario | 1610 E Philadelphia St | San Diego | 91761-5759 | ashtelstudios.***** | 2006 | $80,132,819 | 54 | Corporation | N/A | 2824195 |
| 25 | Wheel Group Holdings, LLC | USA | Ontario | 1050 N Vineyard Ave | San Diego | 91764-3172 | thewheelgroup.***** | 1969 | $74,549,214 | 184 | Corporation | 20 | 5852957 |
Showing 25 of 34,288 companies
Request Free SampleLargest industries in Ontario
The biggest industry groups in Ontario by registered company count, with the top five companies by revenue in each.
General business services
1,384 companies
SIC 7389
Restaurants and eating places
1,093 companies
SIC 5812
Local Trucking Without Storage
827 companies
SIC 4212
Business Consulting Services, Not Elsewhere Classified
761 companies
SIC 8748
General Contractors-Single-Family Houses
734 companies
SIC 1521
Wholesale of nondurable goods
629 companies
SIC 5199
Real estate agents and managers
628 companies
SIC 6531
All industries in Ontario
Together, Transportation Services, Not Elsewhere Classified, general business services and restaurants and eating places make up the top three industries in Ontario, accounting for 12% of the city's commercial activity. The oldest company we can find in Ontario is St Paul Lutheran Church INC, founded in 1831, with First Presbyterian Church Of Ontario Center not far behind. They're still here, along with hundreds of thousands of others.
Everyday trade sets the tone here, with warehouses, workshops, retailers and family-run services handling the practical work that keeps a growing American city supplied. All of them are in our data. Search Ontario businesses in the live tool below, get the full list delivered as an Excel file, or pull the records straight into your own systems through our API.
- Nonclassifiable Establishments4,336
- Transportation Services, Not Elsewhere Classified1,475
- Business Services, Not Elsewhere Classified1,384
- Eating Places1,093
- Local Trucking Without Storage827
- Business Consulting Services, Not Elsewhere Classified761
- General Contractors-Single-Family Houses734
- Nondurable Goods, Not Elsewhere Classified629
- Real Estate Agents and Managers628
- Investors, Not Elsewhere Classified593
- Other industries21,828
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Our Ontario business directory currently lists every registered legal entity with a Ontario address in the official United States business register. The exact count is shown live at the top of this page.
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