> 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/law-practice/ # Law Firms in Chicago, IL The bigger law firms 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 law firms counted in Chicago, IL, the biggest by headcount range include Kirkland & Ellis, Sidley Austin LLP and Winston & Strawn LLP. They are mostly very small: 70% have 50 or fewer employees. ## Which law firms are in Chicago? Among the companies whose public profile lists Law Practice as their industry and Chicago, IL as their headquarters, the biggest by headcount range include Kirkland & Ellis, Sidley Austin LLP, Winston & Strawn LLP, Seyfarth Shaw LLP and Katten Muchin Rosenman LLP. Names link to a company profile where we have one. | Company | Employees | | --- | --- | | Kirkland & Ellis | 5,001 to 10,000 | | Sidley Austin LLP | 1,001 to 5,000 | | Winston & Strawn LLP | 1,001 to 5,000 | | Seyfarth Shaw LLP | 1,001 to 5,000 | | Katten Muchin Rosenman LLP | 1,001 to 5,000 | | Locke Lord LLP | 1,001 to 5,000 | | Jenner & Block | 501 to 1,000 | | Vedder | 501 to 1,000 | | O'hagan Meyer | 501 to 1,000 | | Hinshaw & Culbertson LLP | 501 to 1,000 | | Litchfield Cavo LLP | 501 to 1,000 | | Hlai | 501 to 1,000 | | Amundsen Davis | 201 to 500 | | Chapman And Cutler LLP | 201 to 500 | | Keller Postman | 201 to 500 | | Segal Mccambridge | 201 to 500 | | Clausen Miller P.C | 201 to 500 | | Banner Witcoff | 201 to 500 | | Johnson & Bell, Trial Lawyers | 201 to 500 | | Mandarich Law Group, LLP | 201 to 500 | | Brinks Gilson And Lione | 201 to 500 | | City Of Chicago Department Of Law | 201 to 500 | | Federal Bar Association Chicago Chapter | 201 to 500 | | National Docketing Association | 201 to 500 | | Thomas More Society | 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. ## How big are they? 70% of the law firms 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 law firms in Chicago.** Seven columns for the share of counted law firms in Chicago in each employee range: 11 to 50 70%, 51 to 200 20%, 201 to 500 5%, 501 to 1,000 2%, 1,001 to 5,000 2%, 5,001 to 10,000 0%, 10,001+ 0%. *Share of counted law firms in Chicago in each employee range.* ## How old are they? Most were founded in the 1990s (22%), then the 2010s (19%). **Figure: When law firms in Chicago were founded.** Eight columns for the share of counted law firms in Chicago founded in each era: Before 1960 15%, 1960s 3%, 1970s 6%, 1980s 12%, 1990s 22%, 2000s 18%, 2010s 19%, 2020s 5%. *Share of counted law firms in Chicago by the era they were founded in, for the ones that list a founding year.* ## How law firms compare - 23% were founded in 2010 or later, against 54% across other cities on this site. ## How do you reach the people at law firms in Chicago? The people to talk to are usually managing partners and heads of operations. 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 law firms 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 managing partners and heads of operations at law firms 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/)[Advertising Agencies](https://enrich.chat/companies-in/chicago-il/advertising-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/)[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/) Law Firms in other cities: [New York, NY](https://enrich.chat/companies-in/new-york-ny/law-practice/)[Los Angeles, CA](https://enrich.chat/companies-in/los-angeles-ca/law-practice/)[Houston, TX](https://enrich.chat/companies-in/houston-tx/law-practice/)[Dallas, TX](https://enrich.chat/companies-in/dallas-tx/law-practice/)[Washington, DC](https://enrich.chat/companies-in/washington-dc/law-practice/)[Atlanta, GA](https://enrich.chat/companies-in/atlanta-ga/law-practice/)[Philadelphia, PA](https://enrich.chat/companies-in/philadelphia-pa/law-practice/)[San Francisco, CA](https://enrich.chat/companies-in/san-francisco-ca/law-practice/)[Miami, FL](https://enrich.chat/companies-in/miami-fl/law-practice/)[Boston, MA](https://enrich.chat/companies-in/boston-ma/law-practice/) ## Frequently asked questions ### Which are the biggest law firms in Chicago? Among those counted, they include Kirkland & Ellis, Sidley Austin LLP, Winston & Strawn LLP, Seyfarth Shaw LLP and Katten Muchin Rosenman LLP, ranked by headcount range. ### How big are law firms in Chicago? 70% 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 law practice? Companies whose public profile lists Law Practice as their industry and whose headquarters are in Chicago, IL. ## Try this prompt Find the people at law firms in Chicago ```text Use www.enrich.chat to find the managing partners and heads of operations at law firms 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/) - [Advertising Agencies in Chicago](https://enrich.chat/companies-in/chicago-il/advertising-services/) - [Law Firms in New York](https://enrich.chat/companies-in/new-york-ny/law-practice/) - [Law Firms in Los Angeles](https://enrich.chat/companies-in/los-angeles-ca/law-practice/) - [Law Firms in Houston](https://enrich.chat/companies-in/houston-tx/law-practice/) - [Law Firms in Dallas](https://enrich.chat/companies-in/dallas-tx/law-practice/) - [Tech stack lookup](https://enrich.chat/tools/tech-stack-lookup/)