Transportation Services, Not Elsewhere Classified
1,437 companies
SIC 4789
Companies in Ontario
Behind every street in Ontario sits a business. 33,785 of them, to be exact, all registered in the United States business register. The biggest single industry is Transportation Services, Not Elsewhere Classified with 1,437 companies, roughly 4% of everything that does business in the city.
33,785 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 | $4,260,525,307 | 3,720 | Corporation | 171 | 3201141 |
| 2 | Prime Healthcare Foundation, INC. | USA | Ontario | 3480 E Guasti Rd | San Diego | 91761-7684 | primehealthcare.***** | 2006 | $776,307,206 | 10,500 | Corporation | 171 | 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 | New-Indy Jv CORP. | USA | Ontario | 3500 Porsche Way Ste 150 | San Diego | 91764-4969 | newindycontainerboard.***** | 2014 | $600,005,928 | 500 | Corporation | 26 | 5656922 |
| 7 | 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 |
| 8 | 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 |
| 9 | Ajinomoto Foods North America, INC. | USA | Ontario | 4200 Concours Ste 100 | San Diego | 91764-4982 | ajinomotofoods.***** | 2024 | $495,456,492 | 2,800 | Corporation | 398 | 90561698 |
| 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 | 8,533 | 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 | $288,721,404 | 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 | Prime Healthcare Services - Shasta, LLC | USA | Ontario | 3300 E Guasti Rd | San Diego | 91761-8655 | saintclares.***** | 2008 | $168,094,562 | 1,000 | Corporation | 171 | 4607807 |
| 17 | Avita Ontario Hospital, LLC | USA | Ontario | 715 Richland Mall | Richland | 44906-3802 | wexnermedical.***** | 2018 | $131,161,585 | 39 | Corporation | N/A | 2416889 |
| 18 | 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 |
| 19 | Hci Systems, INC. | USA | Ontario | 1219 E Elm St | San Diego | 91761-4585 | hcisystems.***** | 2008 | $122,035,480 | 50 | Corporation | 6 | 3072097 |
| 20 | Tropicale Foods, LLC | USA | Ontario | 1237 W State St | San Diego | 91762-4015 | tropicalefoods.***** | 1999 | $119,945,428 | 150 | Corporation | 5 | 201933110071 |
| 21 | Taylored Services Holdings, LLC | USA | Ontario | 1495 E Locust St | San Diego | 91761-4570 | tayloredservices.***** | 2023 | $118,567,518 | 520 | Corporation | 889 | 4510169 |
| 22 | Mnx Global Logistics CORP. | USA | Ontario | 1754 E Cedar St Ste A | San Diego | 91761-8059 | mnx.***** | 2023 | $118,324,849 | 500 | Corporation | 3336 | 2236699 |
| 23 | Haliburton International Foods, INC. | USA | Ontario | 3855 Jurupa St | San Diego | 91761-1404 | haliburton.***** | 1993 | $100,000,000 | 250 | Corporation | 2 | 1862932 |
| 24 | Jacks Torin INC | USA | Ontario | 4355 E Brickell St | San Diego | 91761-3700 | torinjacks.***** | 1993 | $99,260,608 | 35 | Corporation | N/A | 1723350 |
| 25 | Idb Holdings, INC. | USA | Ontario | 601 S Rockefeller Ave | San Diego | 91761-7871 | distribution-plus.***** | 1989 | $82,610,013 | 1,500 | Corporation | 47 | 2217247 |
Showing 25 of 33,785 companies
Request Free SampleLargest companies in Ontario
Which company is the largest in Ontario depends on how you measure. You can look at valuation, at revenue or at how many people work there. Valuations are private for most companies, so here we stick to revenue and headcount.
By revenue, Prime Healthcare Services INC comes first in Ontario. It is part of a group with $4.3 billion in yearly revenue. By headcount, James Jones Company comes first with 3,190 employees. We only looked at the 21,582 corporations in Ontario for this; sole traders, foundations and other legal forms are left out.
The two tables below show how all 33,785 companies in Ontario are spread across revenue and headcount bands.
Yearly revenue
46.1%of companies have less than $100,000 in yearly revenue
| Revenue (USD) | Count | Share |
|---|---|---|
| up to $100,000 | 15,565 | 46.1% |
| $100,000 to $500,000 | 12,622 | 37.4% |
| $500,000 to $1M | 1,119 | 3.3% |
| $1M to $5M | 1,023 | 3.0% |
| $5M to $10M | 166 | 0.5% |
| $10M to $50M | 135 | 0.4% |
| $50M to $100M | 15 | <0.1% |
| $100M to $500M | 15 | <0.1% |
| $500M to $1B | 7 | <0.1% |
| $1B or more | 1 | <0.1% |
| Unknown | 3,117 | 9.2% |
Headcount
83.5%of companies have 1 to 4 employees
| Employees | Count | Share |
|---|---|---|
| 1-4 | 28,215 | 83.5% |
| 5-9 | 2,832 | 8.4% |
| 10-19 | 1,092 | 3.2% |
| 20-49 | 691 | 2.0% |
| 50-99 | 282 | 0.8% |
| 100-199 | 139 | 0.4% |
| 200-499 | 69 | 0.2% |
| 500-999 | 15 | <0.1% |
| 1,000-4,999 | 7 | <0.1% |
| Unknown | 443 | 1.3% |
Source: business register and CompanyData. "Unknown" means no published figure.
Largest 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
1,279 companies
SIC 7389
Restaurants and eating places
1,068 companies
SIC 5812
Local Trucking Without Storage
886 companies
SIC 4212
Business Consulting Services, Not Elsewhere Classified
722 companies
SIC 8748
General Contractors-Single-Family Houses
717 companies
SIC 1521
Wholesale of nondurable goods
683 companies
SIC 5199
Investors, Not Elsewhere Classified
583 companies
SIC 6799
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 11% 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 are still here, along with 33,783 other businesses in Ontario.
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. Look up a company in the table at the top of this page, get the full list delivered as an Excel file, or pull the records straight into your own systems through our API.
- Nonclassifiable Establishments4,319
- Transportation Services, Not Elsewhere Classified1,437
- Business Services, Not Elsewhere Classified1,279
- Eating Places1,068
- Local Trucking Without Storage886
- Business Consulting Services, Not Elsewhere Classified722
- General Contractors-Single-Family Houses717
- Nondurable Goods, Not Elsewhere Classified683
- Investors, Not Elsewhere Classified583
- Real Estate Agents and Managers582
- Other industries21,509
How you receive Ontario business data
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Open the search toolFrequently Asked Questions
Common questions about searching, filtering, and ordering Ontario company data.
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.
Ontario records are sourced directly from the official United States business register and enriched with 50+ data points: revenue, employees, industry codes, contact details, and ownership.
Core registry fields are refreshed weekly. Enriched fields (revenue, employees, contact) are refreshed monthly so your Ontario list never goes stale.
Yes. Every Ontario record is tagged with SIC industry codes. You can request your directory filtered by one or several SIC codes, employee size bands, or revenue thresholds.
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