Company lists · Data refreshed September 2026

Top 14 Professional staffing agencies based in Ontario, United States

Name: Professional staffing agencies based in Ontario, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 5, 2026 29 companies tracked

RevenueBase identified 29 company matches for professional staffing agencies associated with Ontario, United States as of September 2026 and tracks 901 professional contacts across them, including 227 with verified work emails. Across the United States, New York is the largest hub for this category (960 companies); Ontario has 29.

This list covers company matches for professional staffing agencies associated with Ontario, United States, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 5, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list RevenueBase SmartSearch · Exact Recorded Sep 5, 2026 How this list was built

29Companies

901Contacts tracked

227Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 14 largest professional staffing agencies based in Ontario, United States

Ranked by team size

Top 14 of 29 company matches for professional staffing agencies based in Ontario, United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 5, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Full Steam Staffing	Exact match	Ontario, CA, United StatesHQ recorded Sep 5, 2026	5,001-10,000	289 contacts →
	Exact match “Full Steam Staffing LLC is a privately owned national leader in providing recruitment, staffing, and human resources solutions.” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
2	Workforce Enterprises	Exact match	Ontario, CA, United StatesHQ recorded Sep 5, 2026	201-500	129 contacts →
	Exact match “At WORKFORCE Enterprises, temporary and contract staffing is what we do.” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
3	Empire Workforce Solutions	Exact match	Ontario, CA, United StatesHQ recorded Sep 5, 2026	201-500	119 contacts →
	Exact match “Premiere Staffing & Recruiting” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
4	Arena Family Of Companies	Exact match	Ontario, CA, United StatesHQ recorded Sep 5, 2026	11-50	111 contacts →
	Exact match “Arena Staffing is a California headquartered employment services organization providing compliant, customized staffing solutions for small and mid-sized businesses.” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
5	VIR Consultant LLC	Exact match	Ontario, CA, United StatesHQ recorded Sep 5, 2026	51-200	38 contacts →
	Exact match “VIR Consultant LLC, emerging as a global strategy consulting brand, has established a strong presence with offices in the USA, India, and Colombia.” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
6	It's Caliber	Exact match	Ontario, CA, United StatesHQ recorded Sep 5, 2026	11-50	21 contacts →
	Exact match “IT’S CALIBER has over a decade of experience providing professional staffing services to clients with both long and short-term workforce needs.” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
7	Changing Lives Staffing INC	Exact match	Ontario, CA, United StatesHQ recorded Sep 5, 2026	1,001-5,000	17 contacts →
	Exact match “Changing Lives Staffing is a California based staffing service, that focuses on building people, and communites, putting people back to work is how we do it!” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
8	People First Employment	Exact match	Ontario, United StatesHQ recorded Sep 5, 2026	51-200	13 contacts →
	Exact match “Specializing in the placement of professionals in the Logistics and Manufacturing world, People First Employment can help you find the talent your company needs to get to the next…” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
9	A Train Staffing LLC	Exact match	Ontario, CA, United StatesHQ recorded Sep 5, 2026	1-10	9 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
10	Employee Force Provider	Exact match	Ontario, CA, United StatesHQ recorded Sep 5, 2026	51-200	6 contacts →
	Exact match “We are aware that you have options, but why Employee Force Provider you may ask?” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
11	Elite Staffing Group	Exact match	Ontario, CA, United StatesHQ recorded Sep 5, 2026	51-200	4 contacts →
	Exact match “At Elite Staffing Group, we believe that people create success through the strong relationships we forge with job seekers and our clients.” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
12	Greatfit Talent Recruitment	Exact match	Ontario, CA, United StatesHQ recorded Sep 5, 2026	1-10	4 contacts →
	Exact match “At GreatFit Talent Recruitment, we are committed to matching top-tier Technology and Healthcare talent with mid-sized to large companies across the nation.” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
13	Ultra Personnel	Exact match	Ontario, CA, United StatesHQ recorded Sep 5, 2026	501-1,000	4 contacts →
	Exact match “At Ultra Personnel, our mission is to empower businesses across Southern and Northern California by providing comprehensive workforce solutions that go beyond traditional staffing.” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
14	Proworks Staffing	Exact match	Ontario, CA, United StatesHQ recorded Sep 5, 2026	51-200	3 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “professional staffing agencies”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 14 of 29 professional staffing agencies based in Ontario, United States

See the full list, filter by size, metro and specialty, and access 227 tracked professional contacts with verified work emails. Direct dials are available where recorded.

Free signup · no credit card

View the full list →

Professional staffing agencies based in Ontario, United States at a glance

As of Sep 5, 2026

25.2%Verified-email coverage

31.1Average contacts per company

51-200Median size (employees)

Sep 5, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Email recency for this list is measured across the whole United States list rather than for Ontario, so it is reported there. Company counts and contact totals on this page are exact for Ontario, over 29 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Company records associated with Ontario, United States whose business descriptions match “professional staffing agencies” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every displayed company carries at least one verified work email. RevenueBase tracks 227 professional contacts with verified work emails across the full matched dataset. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 5, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Professional staffing agencies by metro in the United States

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “professional staffing agencies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many professional staffing agencies are there based in Ontario, United States?

RevenueBase identified 29 company matches for professional staffing agencies associated with Ontario, United States as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Full Steam Staffing tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city in the United States has the most professional staffing agencies?

New York leads the United States with 960 company records, followed by Houston (611) and Atlanta (448). Ontario has 29.

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 227 professional contacts with verified work emails tracked across these 29 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 5, 2026.

Ready to reach these companies? Verified emails and direct dials for all 29 professional staffing agencies based in Ontario, United States. Start with a free account, no credit card.

Download this list →

Related lists

Professional staffing agencies by geography

Browse the directory

About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase SmartSearch, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.