> Enrich.chat gives AI agents verified work emails and mobiles. To use it from an agent, read https://enrich.chat/agents.md . This is the Markdown version of https://enrich.chat/companies-in/chicago-il/advertising-services/ # Advertising Agencies in Chicago, IL The bigger advertising agencies headquartered in Chicago, IL, with what they do, their sizes and how to reach their people. By Enrich.chat Editorial. Updated October 22, 2026. **Short answer:** Among the advertising agencies counted in Chicago, IL, the biggest by headcount range include Leo Burnett, Starcom and Shareasale, Owned By Awin. They are mostly very small: 76% have 50 or fewer employees. ## Which advertising agencies are in Chicago? Among the companies whose public profile lists Advertising Services as their industry and Chicago, IL as their headquarters, the biggest by headcount range include Leo Burnett, Starcom, Shareasale, Owned By Awin, Merge and Okrp. Names link to a company profile where we have one. | Company | Employees | | --- | --- | | Leo Burnett | 5,001 to 10,000 | | Starcom | 5,001 to 10,000 | | Shareasale, Owned By Awin | 1,001 to 5,000 | | Merge | 501 to 1,000 | | Okrp | 501 to 1,000 | | Meet Rise | 201 to 500 | | The Plumtree Group Global | 201 to 500 | | Revolution | 201 to 500 | | Blue Chip | 201 to 500 | | Empower Media | 201 to 500 | | Energy Bbdo | 201 to 500 | | Abelsontaylor Group | 201 to 500 | | 3q Dept | 201 to 500 | | Legacy Marketing | 201 to 500 | | Vaniam Group | 201 to 500 | | Yes Marketing | 201 to 500 | | Aisle Rocket | 201 to 500 | | Rapid Displays | 201 to 500 | | 9rooftops | 201 to 500 | | Dialogtech Now Invoca | 201 to 500 | | Color Communications | 201 to 500 | | Yieldsolutions | 201 to 500 | | Convergensee | 201 to 500 | | Highdive | 51 to 200 | | Semasio | 51 to 200 | The table shows the 25 biggest by headcount range, with ties broken by audience size. The charts and percentages below cover every company counted for this page, not just these 25, and companies with fewer than 11 employees are not counted. Headquarters is the location on each company's public profile. ## What do advertising agencies in Chicago do? Advertising Services is a broad label. The most common NAICS codes among them are 541613 (26%), 541810 (16%) and 541430 (7%). **Figure: What advertising agencies in Chicago do.** Bars for the share of counted advertising agencies with each code: 541613 26%, 541810 16%, 541430 7%, 517810 5%, 541511 3%. *Share of counted advertising agencies in Chicago by their NAICS code.* [NAICS 541613](https://enrich.chat/naics/541613/)[NAICS 541810](https://enrich.chat/naics/541810/)[NAICS 541430](https://enrich.chat/naics/541430/)[NAICS 517810](https://enrich.chat/naics/517810/)[NAICS 541511](https://enrich.chat/naics/541511/) ## How big are they? 76% of the advertising agencies counted in Chicago have 50 or fewer employees, and the middle one is in the 11 to 50 range. Companies with fewer than 11 employees are not counted. **Figure: Size of advertising agencies in Chicago.** Seven columns for the share of counted advertising agencies in Chicago in each employee range: 11 to 50 76%, 51 to 200 19%, 201 to 500 4%, 501 to 1,000 0%, 1,001 to 5,000 0%, 5,001 to 10,000 0%, 10,001+ 0%. *Share of counted advertising agencies in Chicago in each employee range.* ## How old are they? Most were founded in the 2010s (44%), then the 2000s (28%). **Figure: When advertising agencies in Chicago were founded.** Eight columns for the share of counted advertising agencies in Chicago founded in each era: Before 1960 2%, 1960s 1%, 1970s 2%, 1980s 6%, 1990s 9%, 2000s 28%, 2010s 44%, 2020s 8%. *Share of counted advertising agencies in Chicago by the era they were founded in, for the ones that list a founding year.* ## How do you reach the people at advertising agencies in Chicago? The people to talk to are usually agency owners, account and operations leaders. Build the list in three prompts to your AI agent. ### 1. Count them (free) Counting who matches never uses credits. ```text Use www.enrich.chat to count the advertising agencies in Chicago, IL ``` ### 2. Find the people (5 credits per person) Name the roles you sell to. Each person returned is 5 credits, and name, title and company are included. ```text Use www.enrich.chat to find the agency owners, account and operations leaders at advertising agencies in Chicago, IL, with their titles ``` ### 3. Get their work emails (10 credits each) An email is 10 credits only when one is found. Every email comes with a status: verified, catch-all or unknown. ```text Use www.enrich.chat to find the work emails for these people and tell me which ones are verified ``` ## More to explore Other industries in Chicago: [Real Estate Companies](https://enrich.chat/companies-in/chicago-il/real-estate/)[IT Services Companies](https://enrich.chat/companies-in/chicago-il/it-services-and-it-consulting/)[Financial Services Companies](https://enrich.chat/companies-in/chicago-il/financial-services/)[Software Companies](https://enrich.chat/companies-in/chicago-il/software-development/)[Construction Companies](https://enrich.chat/companies-in/chicago-il/construction/)[Hospitals and Health Care Organizations](https://enrich.chat/companies-in/chicago-il/hospitals-and-health-care/)[Consulting Firms](https://enrich.chat/companies-in/chicago-il/business-consulting-and-services/)[Nonprofit Organizations](https://enrich.chat/companies-in/chicago-il/non-profit-organizations/)[Law Firms](https://enrich.chat/companies-in/chicago-il/law-practice/)[Technology and Internet Companies](https://enrich.chat/companies-in/chicago-il/technology-information-and-internet/)[Staffing and Recruiting Firms](https://enrich.chat/companies-in/chicago-il/staffing-and-recruiting/)[Legal Services Firms](https://enrich.chat/companies-in/chicago-il/legal-services/)[Education Organizations](https://enrich.chat/companies-in/chicago-il/education-administration-programs/)[Logistics and Supply Chain Companies](https://enrich.chat/companies-in/chicago-il/transportation-logistics-supply-chain-and-storage/)[Colleges and Universities](https://enrich.chat/companies-in/chicago-il/higher-education/)[Insurance Companies](https://enrich.chat/companies-in/chicago-il/insurance/)[Architecture Firms](https://enrich.chat/companies-in/chicago-il/architecture-and-planning/)[Manufacturers](https://enrich.chat/companies-in/chicago-il/manufacturing/)[Food and Beverage Manufacturers](https://enrich.chat/companies-in/chicago-il/food-and-beverage-manufacturing/)[All of Chicago](https://enrich.chat/companies-in/chicago-il/) Advertising Agencies in other cities: [New York, NY](https://enrich.chat/companies-in/new-york-ny/advertising-services/)[Los Angeles, CA](https://enrich.chat/companies-in/los-angeles-ca/advertising-services/)[Miami, FL](https://enrich.chat/companies-in/miami-fl/advertising-services/)[Atlanta, GA](https://enrich.chat/companies-in/atlanta-ga/advertising-services/)[San Francisco, CA](https://enrich.chat/companies-in/san-francisco-ca/advertising-services/)[Austin, TX](https://enrich.chat/companies-in/austin-tx/advertising-services/)[Dallas, TX](https://enrich.chat/companies-in/dallas-tx/advertising-services/)[Houston, TX](https://enrich.chat/companies-in/houston-tx/advertising-services/)[San Diego, CA](https://enrich.chat/companies-in/san-diego-ca/advertising-services/)[Denver, CO](https://enrich.chat/companies-in/denver-co/advertising-services/) ## Frequently asked questions ### Which are the biggest advertising agencies in Chicago? Among those counted, they include Leo Burnett, Starcom, Shareasale, Owned By Awin, Merge and Okrp, ranked by headcount range. ### How big are advertising agencies in Chicago? 76% of those counted have 50 or fewer employees, and the middle one is in the 11 to 50 range. Companies with fewer than 11 employees are not counted. ### Which companies count as advertising services? Companies whose public profile lists Advertising Services as their industry and whose headquarters are in Chicago, IL. ## Try this prompt Find the people at advertising agencies in Chicago ```text Use www.enrich.chat to find the agency owners, account and operations leaders at advertising agencies in Chicago, IL, with titles and verified work emails ``` ## Related - [Companies using a technology](https://enrich.chat/companies-using/) - [Real Estate Companies in Chicago](https://enrich.chat/companies-in/chicago-il/real-estate/) - [IT Services Companies in Chicago](https://enrich.chat/companies-in/chicago-il/it-services-and-it-consulting/) - [Financial Services Companies in Chicago](https://enrich.chat/companies-in/chicago-il/financial-services/) - [Software Companies in Chicago](https://enrich.chat/companies-in/chicago-il/software-development/) - [Advertising Agencies in New York](https://enrich.chat/companies-in/new-york-ny/advertising-services/) - [Advertising Agencies in Los Angeles](https://enrich.chat/companies-in/los-angeles-ca/advertising-services/) - [Advertising Agencies in Miami](https://enrich.chat/companies-in/miami-fl/advertising-services/) - [Advertising Agencies in Atlanta](https://enrich.chat/companies-in/atlanta-ga/advertising-services/) - [Tech stack lookup](https://enrich.chat/tools/tech-stack-lookup/)