Company lists · Data verified August 2026

Top 25 Advertising agencies based in Chicago, United States

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

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 550 companies tracked

There are 550 advertising agencies headquartered in Chicago, United States (RevenueBase, August 2026). RevenueBase tracks 27,409 professional contacts across them, including 5,356 with verified work emails and 6,003 with mobile numbers. New York is the largest hub.

This list covers advertising 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. Data current as of August 28, 2026.

550Companies

27,409Contacts tracked

5,356Verified emails

6,003Mobile numbers

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The 25 largest advertising agencies based in Chicago, United States

Ranked by team size

Top 25 of 550 advertising agencies based in Chicago, United States, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	Starcom	Chicago, IL	5,001-10,000	5,574	1,665
2	LEO Burnett	Chicago, IL	5,001-10,000	5,394	462
3	Thompson	Chicago, IL	5,001-10,000	3,576	73
4	Spark Foundry	Chicago, IL	1,001-5,000	2,882	1,440
5	Marketing Werks	Chicago, IL	n/a	2,176	18
6	KWT Global	Chicago, IL	51-200	363	11
7	Abelsontaylor Group	Chicago, IL	201-500	267	92
8	Empower Media	Chicago, IL	201-500	213	61
9	Energy Bbdo	Chicago, IL	201-500	152	34
10	Highdive	Chicago, IL	51-200	137	98
11	Paragon Marketing Group	Chicago, IL	51-200	133	66
12	TRIAD	Chicago, IL	201-500	117	30
13	HY Connect	Chicago, IL	51-200	102	1
14	The Food Group	Chicago, IL	51-200	100	58
15	Mabbly	Chicago, IL	51-200	83	26
16	Upshot Agency	Chicago, IL	51-200	83	2
17	Bbc, A B2B Creative Agency	Chicago, IL	51-200	79	53
18	Mindstream Media Group	Chicago, IL	51-200	78	61
19	MOZ WEB Media LLC	Chicago, IL	51-200	74	4
20	AL Media Strategy	Chicago, IL	51-200	70	35
21	Envisionit	Chicago, IL	51-200	69	42
22	Eleven, INC	Chicago, IL	51-200	69	4
23	Eicoff	Chicago, IL	51-200	68	26
24	Thunder Tech	Chicago, IL	51-200	50	33
25	Fluent360	Chicago, IL	51-200	49	31

Showing 25 of 550 advertising agencies based in Chicago, United States

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Advertising agencies based in Chicago, United States at a glance

As of Aug 28, 2026

1-10Median size (employees)

New YorkLargest hub · 1747 HQs

6,003Contacts with mobile numbers

35Emails re-verified in last 30 days

Companies by employee count

1-10

350

11-50

131

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Advertising agencies by metro in the United States

Metro	Companies
Advertising agencies in New York	1747
Advertising agencies in Los Angeles	1195
Advertising agencies in Chicago	550
Advertising agencies in Miami	542
Advertising agencies in Atlanta	500
Advertising agencies in Dallas	383
Advertising agencies in Houston	345

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “advertising agencies”, with match quality audited by blind human judging, and headquartered in Chicago, United States.
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: Contact records re-verify on a rolling cadence; 35 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

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

There are 550 advertising agencies headquartered in Chicago, United States as of August 2026 (RevenueBase).

What is the largest company on this list?

Starcom, headquartered in Chicago, tops this list with the largest team on record.

Which city has the most advertising agencies?

New York leads with 1747 headquartered companies, followed by Los Angeles (1195) and Chicago (550).

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 5,356 verified decision-maker contacts tracked across these 550 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.