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Largest law firms in Illinois

636 firms with at least 10 Illinois-licensed attorneys, 23,682 attorneys between them. Counted from Illinois ARDC records, refreshed 2026-09-06.

#FirmAttorneysShare of ranked
1 Kirkland & Ellis, LLP 805 3.4%
2 Cook County State's Attorney's Office 784 3.3%
3 Law Office of the Cook County Public Defender 554 2.3%
4 Sidley Austin LLP One South Dearborn Street 434 1.8%
5 Mayer Brown, LLP 379 1.6%
6 City of Chicago - Department of Law 303 1.3%
7 Latham & Watkins, LLP 294 1.2%
8 Winston Taylor LLP 289 1.2%
9 Illinois Attorney General 276 1.2%
10 McDermott Will & Schulte LLP 275 1.2%
11 Jenner & Block LLP 249 1.1%
12 Katten Muchin Rosenman LLP 247 1.0%
13 Greenberg Traurig, LLP 202 0.9%
14 Seyfarth Shaw, LLP 194 0.8%
15 Hinshaw & Culbertson, LLP 190 0.8%
16 Office of the State Appellate Defender 188 0.8%
17 Chapman and Cutler, LLP Union Station Tower 181 0.8%
18 Vedder Price, P.C. 177 0.7%
19 Jones Day 173 0.7%
20 Taft, Stettinius & Hollister, LLP 166 0.7%
21 DLA Piper (U.S), LLP 154 0.7%
22 ArentFox Schiff LLP 145 0.6%
23 Benesch, Friedlander, Coplan & Aronoff, LLP 144 0.6%
24 Swanson, Martin & Bell, LLP 140 0.6%
25 Neal, Gerber & Eisenberg LLP 134 0.6%
26 Polsinelli PC 132 0.6%
27 Barack, Ferrazzano, Kirschbaum & Nagelberg, LLP 125 0.5%
28 Foley & Lardner LLP 122 0.5%
29 Baker & McKenzie, LLP 121 0.5%
30 Faegre Drinker Biddle & Reath, LLP 121 0.5%
31 Levenfeld Pearlstein, LLC 119 0.5%
32 Office of the Cook County Public Guardian 119 0.5%
33 Willkie Farr & Gallagher LLP 118 0.5%
34 Amundsen Davis, LLC 117 0.5%
35 Office of the Illinois Attorney General 116 0.5%
36 Morgan, Lewis & Bockius, LLP 115 0.5%
37 Ropes & Gray, LLP 115 0.5%
38 Reed Smith, LLP 111 0.5%
39 PO BOX 109 0.5%
40 Prairie State Legal Services, Inc. 109 0.5%
41 DuPage County State's Attorney Office 108 0.5%
42 Skadden, Arps, Slate, Meagher & Flom, LLP 108 0.5%
43 Legal Aid Chicago 107 0.5%
44 Barnes & Thornburg, LLP One North Wacker Drive Suite 105 0.4%
45 Quarles & Brady, LLP 103 0.4%
46 Troutman Pepper Locke LLP 102 0.4%
47 DENTONS US LLP 96 0.4%
48 Much Shelist, P.C. 95 0.4%
49 Goldberg Kohn, Ltd. 93 0.4%
50 McDonald's Corporation 93 0.4%
51 Ashurst Perkins Coie US LLP 90 0.4%
52 Kane County State's Attorney's Office 89 0.4%
53 P. O. Box 89 0.4%
54 Lewis, Brisbois, Bisgaard & Smith, LLP 88 0.4%
55 Johnson & Bell, Ltd. 86 0.4%
56 Nixon Peabody LLP 83 0.4%
57 Clark HIll PLC 82 0.3%
58 Paul Hastings, LLP 80 0.3%
59 Holland & Knight, LLP 79 0.3%
60 Thompson Coburn, LLP 79 0.3%
61 Croke Fairchild Duarte & Beres, LLC 78 0.3%
62 Marshall, Gerstein & Borun, LLP 78 0.3%
63 Riley Safer Holmes & Cancila LLP 78 0.3%
64 Hepler Broom, LLC 77 0.3%
65 AbbVie, Inc. 74 0.3%
66 Ernst & Young, LLC 73 0.3%
67 Husch Blackwell LLP. 73 0.3%
68 Wilson, Elser, Moskowitz, Edelman & Dicker, LLP 71 0.3%
69 Cassiday Schade, LLP 69 0.3%
70 Crowell & Moring LLP 68 0.3%
71 Heyl Royster Voelker & Allen , PC 68 0.3%
72 K & L Gates, LLP Three First National Plaza 66 0.3%
73 King & Spalding, LLP 66 0.3%
74 Chuhak & Tecson, P.C. 64 0.3%
75 Gordon, Rees, Scully, Mansukhani, LLP 63 0.3%
76 O'Hagan Meyer 63 0.3%
77 Tressler, LLP 62 0.3%
78 Duane Morris, LLP 61 0.3%
79 BatesCarey, LLP 60 0.3%
80 Dykema Gossett, PLLC 60 0.3%
81 Honigman, LLP 60 0.3%
82 Chicago Transit Authority 59 0.2%
83 Saul Ewing, LLP 59 0.2%
84 Aronberg Goldgehn Davis & Garmisa, LLC 58 0.2%
85 STATE OF ILLINOIS 58 0.2%
86 Kilpatrick Townsend & Stockton, LLP 57 0.2%
87 Laner Muchin, Ltd. 57 0.2%
88 McGuire Woods, LLP 56 0.2%
89 Nicolaides Fink Thorpe Michaelides Sullivan LLP 56 0.2%
90 Sheppard, Mullin, Richter & Hampton, LLP 56 0.2%
91 Smith Gambrell Russell 56 0.2%
92 White & Case, LLP 56 0.2%
93 The Northern Trust Company 55 0.2%
94 Bartlit Beck LLP Courthouse Place 53 0.2%
95 ICE MILLER LLP 53 0.2%
96 McAndrews, Held & Malloy, LTD. 53 0.2%
97 Abbott Laboratories, Inc. 52 0.2%
98 Michael Best & Friedrich, LLP 52 0.2%
99 Akerman, LLP 51 0.2%
100 Cooley LLP 51 0.2%
101 Arnold & Porter 50 0.2%
102 Huck Bouma, PC 50 0.2%
103 McDonnell Boehnen Hulbert & Berghoff LLP 50 0.2%
104 Applegate & Thorne-Thomsen, P.C. 49 0.2%
105 Clyde & Co. US LLP 49 0.2%
106 Fox, Swibel, Levin & Carroll, LLP 49 0.2%
107 Illinois Attorney General's Office 49 0.2%
108 Illinois Commerce Commission 49 0.2%
109 Littler Mendelson, P.C. 49 0.2%
110 Loeb & Loeb LLP 49 0.2%
111 McDonald Hopkins LLC 49 0.2%
112 Zurich North America 49 0.2%
113 Burke, Warren, MacKay & Serritella, P.C. 48 0.2%
114 Harrison LLP 48 0.2%
115 Kovitz Shifrin Nesbit, P.C. 48 0.2%
116 Simmons Hanly Conroy LLP One Court Street 48 0.2%
117 Litchfield Cavo, LLP 46 0.2%
118 Social Security Administration 46 0.2%
119 Accenture, LLP 45 0.2%
120 Banner & Witcoff, Ltd. 44 0.2%
121 Beermann, LLP 44 0.2%
122 Caterpillar, Inc. 44 0.2%
123 Gould & Ratner, LLP 43 0.2%
124 Illinois Department of Children and Family Services 43 0.2%
125 KPMG, LLP 43 0.2%
126 Meltzer, Purtill & Stelle, LLC 43 0.2%
127 Patzik, Frank & Samotny, Ltd. 43 0.2%
128 Law Offices of Steven J. Malman & Associates, P.C. 42 0.2%
129 LOEVY & LOEVY 42 0.2%
130 Berger Schatz LLP 41 0.2%
131 Land of Lincoln Legal Aid, Inc. 41 0.2%
132 Deloitte Tax, LLP 40 0.2%
133 Illinois Department of Revenue 40 0.2%
134 Manning Gross + Massenburg LLP 40 0.2%
135 QUINN EMANUEL URQUHART & SULLIVAN, LLP 40 0.2%
136 Walker Wilcox Matousek LLP One North Franklin Street Suite 40 0.2%
137 Foran Glennon Palandech Ponzi & Rudloff PC 39 0.2%
138 Goldberg Segalla LLP 39 0.2%
139 Hennessy & Roach, P.C. 39 0.2%
140 Hughes Socol Piers Resnick & Dym, Ltd. 39 0.2%
141 IFMK Law, Ltd. 39 0.2%
142 Illinois Department of Financial and Professional Regulation 39 0.2%
143 Sperling Kenny Nachwalter LLC 39 0.2%
144 United Airlines, Inc. 39 0.2%
145 Franczek P.C. 38 0.2%
146 Schiller, DuCanto & Fleck, LLP 38 0.2%
147 Cboe Global Markets, Inc. 37 0.2%
148 Goldman Ismail Tomaselli Brennan & Baum LLP 37 0.2%
149 Illinois Department of Employment Security 37 0.2%
150 McGuireWoods, LLP 37 0.2%
151 DLA PIPER, LLP (US) 36 0.2%
152 Hall Prangle LLC 36 0.2%
153 JPMorgan Chase & Co. 36 0.2%
154 JPMorgan Chase Bank, N. A. 36 0.2%
155 Latimer LeVay Fyock LLC 36 0.2%
156 Legal Aid Society of Metropolitan Family Services (LAS) 35 0.1%
157 Michael D. Gallo & Associates 35 0.1%
158 Quintairos, Prieto, Wood & Boyer, P.A. 35 0.1%
159 Will County State's Attorney's Office 35 0.1%
160 Barnes & Thornburg, LLP 33 0.1%
161 Codilis and Assoc., P.C. 33 0.1%
162 Donohue Brown Smyth LLC 33 0.1%
163 Edelson PC 33 0.1%
164 Equip For Equality, Inc. 33 0.1%
165 Illinois Workers' Compensation Commission 33 0.1%
166 Kelleher + Holland, LLC 33 0.1%
167 Lake County State's Attorney's Office 33 0.1%
168 Langhenry, Gillen, Lundquist & Johnson, LLC 33 0.1%
169 Masuda, Funai, Eifert & Mitchell, Ltd. 33 0.1%
170 CME Group, Inc. 32 0.1%
171 Dinsmore & Shohl LLP. 32 0.1%
172 Greer, Burns & Crain, Ltd. 32 0.1%
173 Jackson Lewis LLP 32 0.1%
174 Rusin Law, Ltd. 32 0.1%
175 UB Greensfelder, LLP 32 0.1%
176 Venable LLP 32 0.1%
177 Walgreen Co. 32 0.1%
178 Brown, Hay & Stephens, LLP 31 0.1%
179 Geraci Law, LLC 31 0.1%
180 Keller Postman, LLC 31 0.1%
181 Land of Lincoln, Legal Assistance Foundation, Incorporated 31 0.1%
182 Shook, Hardy & Bacon L.L.P. 31 0.1%
183 Thompson Hine LLP 31 0.1%
184 Bryan Cave Leighton Paisner LLP 30 0.1%
185 Illinois Environmental Protection Agency 30 0.1%
186 Leahy, Eisenberg & Fraenkel, LTD. 30 0.1%
187 Meyer Capel, A Professional Corporation 30 0.1%
188 Ogletree, Deakins, Nash, Smoak & Stewart, P.C. 30 0.1%
189 Ottosen DiNolfo Hasenbalg & Castaldo, Ltd. 30 0.1%
190 Rock, Fusco, & Connelly, LLC 30 0.1%
191 Downey & Lenkov LLC 29 0.1%
192 Northern Trust 29 0.1%
193 Office of the State Appellate Defender One Douglas Avenue 29 0.1%
194 Sinars Slowikowski LLC 29 0.1%
195 U. S. Securities and Exchange Commission 29 0.1%
196 Wiedner & McAuliffe, LTD. 29 0.1%
197 Ancel Glink, P.C. 28 0.1%
198 Best, Vanderlaan & Harrington Attorneys At Law 28 0.1%
199 Blank Rome LLP 28 0.1%
200 BMO Bank, N.A. 28 0.1%

Showing the top 200 of 636 ranked firms.

An attorney counts toward a firm in Illinois when their Illinois licence is active and their bar record names that firm. Attorneys who report no firm are not counted, so these are floors rather than totals. Method →