Company lists · Data refreshed September 2026

Top 25 Interim agencies based in Chicago, United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 188 companies tracked

RevenueBase identified 188 interim agencies headquartered in Chicago, United States as of September 2026 and tracks 11,988 professional contacts across them, including 1,816 with verified work emails. New York is the largest hub.

This list covers interim agencies headquartered in Chicago, United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 21, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, 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 HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 21, 2026 86% judged on-target in blind review

188Companies

11,988Contacts tracked

1,816Verified emails

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The 25 largest interim agencies based in Chicago, United States

Ranked by team size

Top 25 of 188 interim agencies based in Chicago, United States, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to interim agencies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Staff Management SMX	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	501-1,000	2,680 contacts →
	Indirect evidence “Founded in 1988, Staff Management is a recognized leader of comprehensive workforce solutions that deliver best talent, drive compliance, yield tangible savings and build…” Source: RevenueBase Database · checked Sep 21, 2026
2	Addison Group	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,840 contacts →
	Indirect evidence “Addison Group provides comprehensive talent solutions and consulting services across diverse practice areas, including Non-Clinical Healthcare, Information Technology (IT), Human…” Source: RevenueBase Database · checked Sep 21, 2026
3	MEDIX	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	501-1,000	1,753 contacts →
	Indirect evidence “Medix provides workforce solutions to clients and creates opportunity for talent in the Healthcare, Life Sciences, Engineering and Technology fields.” Source: RevenueBase Database · checked Sep 21, 2026
4	Elite Staffing INC	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	10001+	1,661 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026
5	Lasalle Network	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	201-500	605 contacts →
	Indirect evidence “Keeping business transformations on track is essential to maintaining market advantage.” Source: RevenueBase Database · checked Sep 21, 2026
6	Connect Search, LLC	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	51-200	310 contacts →
	Indirect evidence “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.” Source: RevenueBase Database · checked Sep 21, 2026
7	Crystal Equation Corporation	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	201-500	262 contacts →
	Indirect evidence “Crystal Equation (CE) is a certified Women-Owned Business that empowers people and advances technology initiatives by building trust.” Source: RevenueBase Database · checked Sep 21, 2026
8	The Jacobson Group	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	51-200	251 contacts →
	Indirect evidence “The Jacobson Group is the leading provider of talent to the insurance industry.” Source: RevenueBase Database · checked Sep 21, 2026
9	Synectics INC	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	201-500	248 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026
10	Advanced Resources	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	n/a	223 contacts →
	Indirect evidence “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…” Source: RevenueBase Database · checked Sep 21, 2026
11	Brilliant	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	51-200	162 contacts →
	Indirect evidence “About Brilliant® Brilliant is an award-winning staffing and recruiting firm that provides direct-hire and contract staffing services in accounting, finance, technology, and…” Source: RevenueBase Database · checked Sep 21, 2026
12	City Staffing	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	1,001-5,000	148 contacts →
	Indirect evidence “City Staffing partners with organizations that need talent fast and at scale-without sacrificing quality.” Source: RevenueBase Database · checked Sep 21, 2026
13	Hirewell	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	51-200	134 contacts →
	Indirect evidence “Hirewell is a global talent solutions provider that combines domain expert recruiters with modern hiring strategy to deliver people who make a difference.” Source: RevenueBase Database · checked Sep 21, 2026
14	Mack & Associates, LTD	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	11-50	132 contacts →
	Indirect evidence “For over 25 years, Mack & Associates has been the boutique staffing firm of choice for Chicagoland’s top professional services firms.” Source: RevenueBase Database · checked Sep 21, 2026
15	Proficientnow, INC	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	51-200	112 contacts →
	Indirect evidence “Proficient Now Inc is a nationwide talent firm located in Lisle, IL.” Source: RevenueBase Database · checked Sep 21, 2026
16	MMD Services	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	n/a	104 contacts →
	Indirect evidence “MMD Services Inc.” Source: RevenueBase Database · checked Sep 21, 2026
17	Labor Temps	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	201-500	72 contacts →
	Indirect evidence “Labor Temps is a team of staffing professionals that understands your business and is eager to help you and your organization meet your business objectives.” Source: RevenueBase Database · checked Sep 21, 2026
18	Altastaff	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	201-500	56 contacts →
	Indirect evidence “AltaStaff is a certified WBE and IL BEP staffing company that provides direct hire, temp-to-hire, and temporary staffing.” Source: RevenueBase Database · checked Sep 21, 2026
19	Talent Solutions Group, INC	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	11-50	37 contacts →
	Indirect evidence “Talent Solutions Group is a specialized recruiting and talent solutions firm focused on connecting exceptional professionals with leading organizations across Capital Markets…” Source: RevenueBase Database · checked Sep 21, 2026
20	North Bridge Staffing Group	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	51-200	37 contacts →
	Indirect evidence “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.” Source: RevenueBase Database · checked Sep 21, 2026
21	The Hire Company	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	n/a	33 contacts →
	Indirect evidence “The Hire Company is a woman-owned, boutique recruiting firm who puts people first.” Source: RevenueBase Database · checked Sep 21, 2026
22	ARETÊ	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	201-500	31 contacts →
	Indirect evidence “What We Do: Arete is a direct hiring partner for several of the Nation's Largest Employers!” Source: RevenueBase Database · checked Sep 21, 2026
23	Primary Staffing	Indirect evidence	Chicago, United StatesHQ checked Sep 21, 2026	51-200	29 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026
24	The Larko Group	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	11-50	24 contacts →
	Indirect evidence “Founded in 1993, Larko is a nationwide, women-owned recruitment & staffing firm committed to creating a streamlined experience for both clients and candidates.” Source: RevenueBase Database · checked Sep 21, 2026
25	Arlington Resources	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	11-50	24 contacts →
	Indirect evidence “Arlington Resources specializes in the placement of Human Resources Professionals for direct hire, contract and temporary services.” Source: RevenueBase Database · checked Sep 21, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: interim agencies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names interim agencies.
Partial evidence: Its own public description names part of interim agencies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name interim agencies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 188 interim agencies based in Chicago, United States

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Interim agencies based in Chicago, United States at a glance

As of Sep 21, 2026

15.1%Verified-email coverage

63.8Average contacts per company

11-50Median size (employees)

223.4%Largest-city concentration · New York

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

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 188 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among interim agencies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in Chicago, United States whose own description of what they do matches “interim agencies”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names interim agencies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among interim agencies, and records with no verified work email. Companies headquartered outside Chicago are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
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 listed company carries at least one verified work email, 1,816 across the full list. 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 21, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Interim agencies by metro in the United States

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names interim agencies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

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

RevenueBase identified 188 interim agencies headquartered in Chicago, United States as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Staff Management SMX, headquartered in Chicago, tops this list with the largest team on record.

Which city has the most interim agencies?

New York leads with 420 headquartered companies, followed by Houston (354) and Dallas (255).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 1,816 verified decision-maker contacts tracked across these 188 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 21, 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 Smart Search, 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.