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Top 54 law firms in Illinois

Tamtam tracks 54 law firms headquartered in Illinois. This list ranks all of them by number of employees on LinkedIn, led by Baker McKenzie, Kirkland & Ellis and Sidley Austin LLP. Their median headcount is 355. Half of them were founded in 1977 or later. The most common headquarters are Chicago (40) and Peoria (2).

馃嚭馃嚫 Illinois54 companiesUpdated Nov 2, 2026
#CompanyIndustryHeadquarters EmployeesFounded
1
Baker McKenziebakermckenzie.com

Provide practical legal advice combining local knowledge and international expertise to help businesses succeed across global markets.

Law Practice 馃嚭馃嚫 Chicago 11,895 n/a
2
Kirkland & Elliskirkland.com

Providing top-tier legal services in corporate transactions, litigation, investigations, and asset management with global reach and innovative approach.

Law Practice 馃嚭馃嚫 Chicago 8,683 1909
3
Sidley Austin LLPsidley.com

Providing comprehensive legal services worldwide, specializing in complex transactions, restructuring, investigations, regulatory, and litigation matters across multiple industries.

Law Practice 馃嚭馃嚫 Chicago 5,113 1866
4
Mayer Brownmayerbrown.com

Representation of major corporations, funds, and financial institutions in complex transactions and disputes across international markets.

Law Practice 馃嚭馃嚫 Chicago 4,544 n/a
5
Provanaprovana.com

A company providing credit and collection solutions aimed at driving growth and profitability through workforce optimization and streamlined processes

IT Services and IT Consulting 馃嚭馃嚫 Lisle 3,049 2011
6
Seyfarth Shaw LLPseyfarth.com

Specialized legal firm providing innovative, high-caliber representation in complex litigation, transformational deals, and cross-border projects globally.

Law Practice 馃嚭馃嚫 Chicago 2,326 1945
7
Relativityrelativity.com

A software company offering RelativityOne, a SaaS product for data organization, truth discovery, and action during litigation and investigations in various sectors globally

Software Development 馃嚭馃嚫 Chicago 1,856 n/a
8
Winston & Strawn LLPwinstontaylor.com

Provides comprehensive legal services including litigation, transactions, regulatory advice, and business solutions with a focus on client partnership and inclusion.

Law Practice 馃嚭馃嚫 Chicago 1,752 n/a
9
Katten Muchin Rosenman LLPkatten.com

A full-service law firm with nearly 700 attorneys offering high-value legal services globally, specializing in corporate, financial services, litigation, real estate, and more

Law Practice 馃嚭馃嚫 Chicago 1,550 1974
10
Literalitera.com

It specializes in legal technology, offering AI-driven solutions for document management, due diligence, and collaboration for legal teams globally.

Artificial Intelligence 馃嚭馃嚫 Chicago 1,535 n/a
11
Hinshaw & Culbertson LLPhinshawlaw.com

A US law firm with offices nationwide and in London specializing in insurance, professional services, banking, finance, debt collection, and litigation services

Law Practice 馃嚭馃嚫 Chicago 1,274 1934
12
Jenner & Blockjenner.com

Jenner & Block is a renowned law firm with over 500 lawyers known for fearless advocacy, creative solutions, and shaping legal outcomes

Law Practice 馃嚭馃嚫 Chicago 1,226 1914
13
Cook County State鈥檚 Attorney鈥檚 Officecookcountystatesattorney.org

This company is the second largest prosecutor's office in the nation, responsible for prosecuting crimes in Cook County and providing legal counsel

Law Enforcement 馃嚭馃嚫 Chicago 1,020 n/a
14
Veddervedderprice.com

A global law firm with over 400 professionals providing high-value legal counsel in M&A, banking, litigation, executive compensation, employment law, and more

Law Practice 馃嚭馃嚫 Chicago 899 1952
15
Illinois Attorney General's Officeillinoisattorneygeneral.gov

The company represents the State of Illinois, enforces laws, provides legal representation, and advocates for the people's interests

Legal Services 馃嚭馃嚫 Chicago 823 n/a
16
Locke Lord LLPtroutman.com

Premier full-service law firm specializing in complex litigation, regulatory, and transactional work for clients globally, with a focus on diverse industries

Law Practice 馃嚭馃嚫 Chicago 816 1887
17
O'Hagan Meyerohaganmeyer.com

A national law firm specializing in defending corporations in litigation cases, providing tailored services for clients across multiple locations nationwide

Law Practice 馃嚭馃嚫 Chicago 686 n/a
18
Cook County Public Defendercookcountypublicdefender.org

A leading criminal defense firm in Cook County, Illinois, providing legal representation to thousands of individuals facing criminal charges and child protection violations

Legal Services 馃嚭馃嚫 Chicago 596 n/a
19
Chapman and Cutler LLPchapman.com

A finance-focused law firm providing strategic legal advice to financial companies and investors, offering innovative solutions and fostering a collaborative culture

Law Practice 馃嚭馃嚫 Chicago 583 1913
20
Amundsen Davis, LLCamundsendavislaw.com

A Midwest law firm with 180 attorneys specializing in business law, offering full service in transactional, labor, employment, and litigation matters across the US

Law Practice 馃嚭馃嚫 Chicago 549 1997
21
Faegre Baker Daniels LLP

Faegre Drinker is a combined entity formed by the merger of Faegre Baker Daniels and Drinker Biddle & Reath in February 2020

Law Practice 馃嚭馃嚫 Chicago 440 n/a
22
Litchfield Cavo LLPlitchfieldcavo.com

A national law firm specializing in insurance and business defense matters with offices across the country, providing innovative solutions to clients

Law Practice 馃嚭馃嚫 Chicago 423 1998
23
Envoy Globalenvoyglobal.com

Global immigration services provider offering a platform for seamless international workforce management, combining legal representation and technology to support talent acquisition and compliance

Human Resources Services 馃嚭馃嚫 Chicago 415 1998
24
Segal McCambridgesegalmccambridge.com

A national law firm with accomplished trial attorneys, representing clients in complex litigation matters across the United States

Law Practice 馃嚭馃嚫 Chicago 398 1986
25
HaystackIDhaystackid.com

HaystackID offers innovative solutions for legal, compliance, regulatory, and cyber challenges worldwide, including advisory services, data discovery, AI-managed review, and custom enterprise solutions

Legal Services 馃嚭馃嚫 Chicago 383 2011
26
Keller Postman LLCkellerpostman.com

National law firm representing plaintiffs in complex litigation at trial and appellate levels, handling class actions, mass actions, arbitrations, and multi-jurisdictional matters

Law Practice 馃嚭馃嚫 Chicago 370 2018
27
Neal, Gerber & Eisenberg LLPnge.com

Provides personalized legal business solutions and litigation services to diverse clients, including Fortune 100 companies and nonprofits.

Law Practice 馃嚭馃嚫 Chicago 355 1986
28
Fulcrum GTfulcrumgt.com

Leader in legal management solutions, offering a comprehensive ecosystem on SAP platform with pre-configured processes, analytics, financials, and world-class support services

Software Development 馃嚭馃嚫 Chicago 347 n/a
29
LegalShield Independent Associate - James Younglegalshield.com

The company offers legal plans to provide accessible and affordable legal protection, offering 24/7 access to top-quality law firms for various legal matters

Legal Services 馃嚭馃嚫 Bartlett 342 2013
30
Heyl Roysterheylroyster.com

Regional law firm with over 100 lawyers across seven offices in Illinois and Missouri, offering legal services to businesses, professionals, healthcare organizations, and more

Law Practice 馃嚭馃嚫 Peoria 310 1910
31
LAFlegalaidchicago.org

The company provides free legal services to Cook County residents in poverty, seniors, veterans, and survivors of domestic violence, ensuring equal access to justice

Legal Services 馃嚭馃嚫 Chicago 308 1972
32
Johnson & Bell, Trial Lawyersjohnsonandbell.com

Providing efficient legal counsel to diverse clients in various sectors, delivering viable solutions through courtroom representation, mediation, and business transactions

Law Practice 馃嚭馃嚫 Chicago 245 1975
33
Office of the State Appellate Defenderillinois.gov

A state agency representing indigent individuals in criminal appeals across Illinois, with district offices in five appellate court districts

Law Practice 馃嚭馃嚫 Springfield 240 n/a
34
Legal Aid Chicagolegalaidchicago.org

Providing free legal services in civil matters to Cook County residents in poverty and other vulnerable individuals for over 50 years

Legal Services 馃嚭馃嚫 Chicago 225 1972
35
HeplerBroom LLCheplerbroom.com

A legal firm committed to excellence, integrity, and results, providing compelling courtroom advocacy, master strategy, and winning outcomes for clients regionally

Law Practice 馃嚭馃嚫 Edwardsville 216 1894
36
Goldberg Kohn Ltd.goldbergkohn.com

A Chicago-based commercial law firm specializing in business litigation, finance, bankruptcy, corporate transactions, intellectual property, labor, employment, real estate, and taxation

Law Practice 馃嚭馃嚫 Chicago 186 1976
37
The Codilis Family of Firmscodilis.com

A legal services firm in multiple states, specializing in foreclosure, bankruptcy, and REO title and closing services with a commitment to excellent customer service

Legal Services 馃嚭馃嚫 Burr Ridge 185 1977
38
Hennessy & Roach, P.C.hennessyroach.com

Midwest defense law firm handling Workers Compensation, General Litigation, Auto, Trucking, Premises, Construction, Product, Labor & Employment, Senior Care, and Insurance Defense matters in multiple states Founded in 1993

Law Practice 馃嚭馃嚫 Chicago 183 1993
39
Kopka Lawkopkalaw.com

Regional law firm specializing in defense for corporations and insurance companies in various litigated matters across multiple states, focusing on exceeding client expectations

Law Practice 馃嚭馃嚫 Gurnee 183 n/a
40
Hire Counselhirecounsel.com

An agile legal talent company providing on-demand legal professionals to enhance matter management results while prioritizing employee benefits and development

Legal Services 馃嚭馃嚫 Chicago 182 1987
41
HANDLER THAYER, LLPhandlerthayer.com

A full-service law firm offering business, corporate, real estate, estate planning, taxation, and sports/entertainment legal services to a diverse client base

Legal Services 馃嚭馃嚫 Chicago 30 n/a
42
Williams, Bax & Saltzman, P.C.wbs-law.com

This company provides exceptional, personalized, and cost-effective legal representation, leveraging over 15 years of experience to achieve effective solutions for clients

Law Practice 馃嚭馃嚫 Chicago 19 2000
43
McCarthy Duffy LLPmccarthyduffy.com

A business-focused law firm providing legal services to businesses, executives, investors, and individuals in various corporate, commercial, banking, transactional, and litigation matters

Law Practice 馃嚭馃嚫 Chicago 18 1886
44
Foster, Buick, Conklin, Lundgren & Gottschalk, LLCfosterbuick.com

Established in 1963, our law firm offers a diverse range of legal services including estate planning, probate, real estate, business planning, and trial practice

Legal Services 馃嚭馃嚫 Sycamore 18 1963
45
Messer Strickler Burnette, Ltdmesserstricklerburnette.com

Boutique law firm based in Chicago, serving businesses nationwide with transactional and litigation services, expanding presence in Southeast and Midwest

Law Practice 馃嚭馃嚫 Barrington 18 2016
46
Metcalf & Associates, P.C.askimmigration.com

A legal services firm specializing in providing legal support and expertise to individuals and businesses

Law Practice 馃嚭馃嚫 Hoffman Estates 15 1996
47
Burke Burns & Pinelli, Ltd.bbp-chicago.com

Providing top-notch legal advice by combining the resources of a large firm with the personalized service of a small firm

Law Practice 馃嚭馃嚫 Chicago 13 1992
48
Johnson, Bunce & Noble, P.C.peorialawyers.com

A law firm based in Peoria, IL offering services in business, real estate, estate planning, elder law, governmental law, taxation, and litigation

Law Practice 馃嚭馃嚫 Peoria 13 1946
49
O鈥橰ourke & Moody LLPorourkellp.com

Boutique law firm specializing in Gaming, Corporate, Real Estate Law and Litigation, providing personalized, practical, and creative counsel tailored to client needs

Law Practice 馃嚭馃嚫 Chicago 12 1995
50
Churchill, Quinn, Hamilton, & Van Donselaar, Ltd.grayslakelaw.com

A long-standing legal firm in northeast Illinois offering expertise in various legal areas, combining large firm experience with personalized service

Legal Services 馃嚭馃嚫 Grayslake 12 1903
51
Klein, Daday, Aretos & O'Donoghue, LLCkdaolaw.com

A law firm committed to understanding and achieving clients' goals through timely, efficient, and ethical legal services in various practice areas

Law Practice 馃嚭馃嚫 Schaumburg 12 1985
52
Wood, DeVary, Armstrong & Houska, P.C.wdalawyers.com

A full-service law firm providing excellence in legal representation for clients in areas such as estate planning, real estate, business law, and civil litigation

Law Practice 馃嚭馃嚫 Bloomington 7 1977
53
Courthouse Couriercourthousecourier.org

A private process serving firm with offices in multiple Illinois cities, specializing in legal document delivery Member of professional associations

Legal Services 馃嚭馃嚫 Chicago 6 1999
54
Walker Morton LLPwalkermortonllp.com

A full service law firm specializing in corporate, employment, capital markets, estate administration, investment funds, litigation, real estate, and tax law

Law Practice 馃嚭馃嚫 Chicago 4 n/a

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How this list is built

Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 2, 2026.

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