Company lists · Data refreshed October 2026

Top 25 IT contractor agencies based in Chicago, United States

Name: IT contractor agencies based in Chicago, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Oct 17, 2026 238 companies tracked

RevenueBase identified 238 company matches for IT contractor agencies associated with Chicago, United States as of October 2026 and tracks 11,406 professional contacts across them, including 2,050 with verified work emails. Across the United States, New York is the largest hub for this category (534 companies); Chicago has 238.

This list covers company matches for IT contractor agencies associated with Chicago, 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 October 17, 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 Oct 17, 2026 How this list was built

238Companies

11,406Contacts tracked

2,050Verified emails

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The 25 largest IT contractor agencies based in Chicago, United States

Ranked by team size

Top 25 of 238 company matches for IT contractor agencies based in Chicago, United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 17, 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	Addison Group	Exact match	Chicago, IL, United StatesHQ recorded Oct 17, 2026	1,001-5,000	1,972 contacts →
	Exact match “Addison Group provides comprehensive talent solutions and consulting services across diverse practice areas, including Non-Clinical Healthcare, Information Technology (IT), Human…” Recorded in the RevenueBase company graph · Oct 17, 2026 · View company records in RevenueBase
2	MEDIX	Exact match	Chicago, IL, United StatesHQ recorded Oct 17, 2026	501-1,000	1,836 contacts →
	Exact match “Medix provides workforce solutions to clients and creates opportunity for talent in the Healthcare, Life Sciences, Engineering and Technology fields.” Recorded in the RevenueBase company graph · Oct 17, 2026 · View company records in RevenueBase
3	Elite Staffing INC	Exact match	Chicago, IL, United StatesHQ recorded Oct 17, 2026	10001+	1,755 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Oct 17, 2026 · View company records in RevenueBase
4	Lasalle Network	Exact match	Chicago, IL, United StatesHQ recorded Oct 17, 2026	201-500	678 contacts →
	Exact match “Keeping business transformations on track is essential to maintaining market advantage.” Recorded in the RevenueBase company graph · Oct 17, 2026 · View company records in RevenueBase
5	Connect Search, LLC	Exact match	Chicago, IL, United StatesHQ recorded Oct 17, 2026	51-200	346 contacts →
	Exact match “Connect Search, LLC is a boutique staffing firm founded by a group of partners who share the same vision and are all recruiters at heart.” Recorded in the RevenueBase company graph · Oct 17, 2026 · View company records in RevenueBase
6	The Jacobson Group	Exact match	Chicago, IL, United StatesHQ recorded Oct 17, 2026	51-200	286 contacts →
	Exact match “The Jacobson Group is the leading provider of talent to the insurance industry.” Recorded in the RevenueBase company graph · Oct 17, 2026 · View company records in RevenueBase
7	Crystal Equation Corporation	Exact match	Chicago, IL, United StatesHQ recorded Oct 17, 2026	201-500	274 contacts →
	Exact match “Crystal Equation (CE) is a certified Women-Owned Business that empowers people and advances technology initiatives by building trust.” Recorded in the RevenueBase company graph · Oct 17, 2026 · View company records in RevenueBase
8	Synectics INC	Exact match	Chicago, IL, United StatesHQ recorded Oct 17, 2026	201-500	274 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Oct 17, 2026 · View company records in RevenueBase
9	Advanced Resources	Exact match	Chicago, IL, United StatesHQ recorded Oct 17, 2026	n/a	242 contacts →
	Exact match “Over our 30+ year history, Advanced Resources has supported thousands of clients as they tackle their human capital challenges by providing staffing, direct hire, and consulting…” Recorded in the RevenueBase company graph · Oct 17, 2026 · View company records in RevenueBase
10	SWOON	Exact match	Chicago, IL, United StatesHQ recorded Oct 17, 2026	501-1,000	240 contacts →
	Exact match “A bold vision can only take you so far.” Recorded in the RevenueBase company graph · Oct 17, 2026 · View company records in RevenueBase
11	Brilliant	Exact match	Chicago, IL, United StatesHQ recorded Oct 17, 2026	51-200	186 contacts →
	Exact match “About Brilliant® Brilliant is an award-winning staffing and recruiting firm that provides direct-hire and contract staffing services in accounting, finance, technology, and…” Recorded in the RevenueBase company graph · Oct 17, 2026 · View company records in RevenueBase
12	City Staffing	Exact match	Chicago, IL, United StatesHQ recorded Oct 17, 2026	1,001-5,000	160 contacts →
	Exact match “City Staffing partners with organizations that need talent fast and at scale-without sacrificing quality.” Recorded in the RevenueBase company graph · Oct 17, 2026 · View company records in RevenueBase
13	Mack & Associates, LTD	Exact match	Chicago, IL, United StatesHQ recorded Oct 17, 2026	11-50	140 contacts →
	Exact match “For over 25 years, Mack & Associates has been the boutique staffing firm of choice for Chicagoland’s top professional services firms.” Recorded in the RevenueBase company graph · Oct 17, 2026 · View company records in RevenueBase
14	Hirewell	Exact match	Chicago, IL, United StatesHQ recorded Oct 17, 2026	51-200	137 contacts →
	Exact match “Hirewell is a global talent solutions provider that combines domain expert recruiters with modern hiring strategy to deliver people who make a difference.” Recorded in the RevenueBase company graph · Oct 17, 2026 · View company records in RevenueBase
15	Gforce Life Sciences	Exact match	Chicago, IL, United StatesHQ recorded Oct 17, 2026	51-200	119 contacts →
	Exact match “Multi-Year Award Winner Inc.” Recorded in the RevenueBase company graph · Oct 17, 2026 · View company records in RevenueBase
16	Proficientnow, INC	Exact match	Chicago, IL, United StatesHQ recorded Oct 17, 2026	51-200	116 contacts →
	Exact match “Proficient Now Inc is a nationwide talent firm located in Lisle, IL.” Recorded in the RevenueBase company graph · Oct 17, 2026 · View company records in RevenueBase
17	MMD Services	Exact match	Chicago, IL, United StatesHQ recorded Oct 17, 2026	n/a	111 contacts →
	Exact match “MMD Services Inc.” Recorded in the RevenueBase company graph · Oct 17, 2026 · View company records in RevenueBase
18	Harmer	Exact match	Chicago, IL, United StatesHQ recorded Oct 17, 2026	51-200	85 contacts →
	Exact match “Founded in 1986, Harmer is a trusted recruiting partner specializing in Accounting, Finance, and Information Technology.” Recorded in the RevenueBase company graph · Oct 17, 2026 · View company records in RevenueBase
19	Altastaff	Exact match	Chicago, IL, United StatesHQ recorded Oct 17, 2026	201-500	59 contacts →
	Exact match “AltaStaff is a certified WBE and IL BEP staffing company that provides direct hire, temp-to-hire, and temporary staffing.” Recorded in the RevenueBase company graph · Oct 17, 2026 · View company records in RevenueBase
20	North Bridge Staffing Group	Exact match	Chicago, IL, United StatesHQ recorded Oct 17, 2026	51-200	40 contacts →
	Exact match “North Bridge Staffing was established in 2002 by Gerrie and Pat Dugan, who believed there was a need to provide customized talent solutions to clients, associates, and candidates.” Recorded in the RevenueBase company graph · Oct 17, 2026 · View company records in RevenueBase
21	Talution Group	Exact match	Chicago, IL, United StatesHQ recorded Oct 17, 2026	11-50	38 contacts →
	Exact match “Talution Group was established in 2009 to address the IT market’s growing demand for staff augmentation, with a focus on application development, Salesforce, functional roles…” Recorded in the RevenueBase company graph · Oct 17, 2026 · View company records in RevenueBase
22	Talent Solutions Group, INC	Exact match	Chicago, IL, United StatesHQ recorded Oct 17, 2026	11-50	37 contacts →
	Exact match “Talent Solutions Group is a specialized recruiting and talent solutions firm focused on connecting exceptional professionals with leading organizations across Capital Markets…” Recorded in the RevenueBase company graph · Oct 17, 2026 · View company records in RevenueBase
23	BCI	Exact match	Chicago, IL, United StatesHQ recorded Oct 17, 2026	11-50	37 contacts →
	Exact match “BCI is a boutique recruiting firm that has served the financial services industry nationwide for more than 25 years.” Recorded in the RevenueBase company graph · Oct 17, 2026 · View company records in RevenueBase
24	ARETÊ	Exact match	Chicago, IL, United StatesHQ recorded Oct 17, 2026	201-500	33 contacts →
	Exact match “What We Do: Arete is a direct hiring partner for several of the Nation's Largest Employers!” Recorded in the RevenueBase company graph · Oct 17, 2026 · View company records in RevenueBase
25	Access Search, INC	Exact match	Chicago, IL, United StatesHQ recorded Oct 17, 2026	11-50	31 contacts →
	Exact match “ASI is more than just a reliable search firm; we are a trustworthy business partner.” Recorded in the RevenueBase company graph · Oct 17, 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 “IT contractor 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 25 of 238 IT contractor agencies based in Chicago, United States

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IT contractor agencies based in Chicago, United States at a glance

As of Oct 17, 2026

18.0%Verified-email coverage

47.9Average contacts per company

11-50Median size (employees)

Oct 17, 2026Page data refreshed

Companies by employee count

1-10

101

11-50

51-200

201-500

501-1,000

1,001-5,000

10001+

Email recency for this list is measured across the whole United States list rather than for Chicago, so it is reported there. Company counts and contact totals on this page are exact for Chicago, over 238 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 Chicago, United States whose business descriptions match “IT contractor 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 2,050 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 October 17, 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.

IT contractor 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 “IT contractor agencies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many IT contractor agencies are there based in Chicago, United States?

RevenueBase identified 238 company matches for IT contractor agencies associated with Chicago, United States as of October 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?

Addison Group 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 IT contractor agencies?

New York leads the United States with 534 company records, followed by Houston (412) and Dallas (314). Chicago has 238.

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 2,050 professional contacts with verified work emails tracked across these 238 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 October 17, 2026.

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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.