Illinois is home to some of the largest and most prestigious law firms in the United States. These firms handle a wide range of legal matters, from complex corporate transactions to high-stakes litigation. Here are the five largest law firms in Illinois, ranked by number of attorneys:
- Sidley Austin LLP: Sidley Austin is a global law firm with over 2,000 attorneys in offices around the world. The firm’s Chicago office is its largest, with over 500 attorneys. Sidley Austin is known for its work in corporate law, finance, litigation, and intellectual property.
- Kirkland & Ellis LLP: Kirkland & Ellis is another global law firm with over 2,000 attorneys in offices around the world. The firm’s Chicago office is its second-largest, with over 400 attorneys. Kirkland & Ellis is known for its work in corporate law, finance, litigation, and antitrust law.
- Winston & Strawn LLP: Winston & Strawn is a global law firm with over 1,000 attorneys in offices around the world. The firm’s Chicago office is its largest, with over 300 attorneys. Winston & Strawn is known for its work in corporate law, finance, litigation, and real estate law.
- Katten Muchin Rosenman LLP: Katten Muchin Rosenman is a national law firm with over 600 attorneys in offices across the United States. The firm’s Chicago office is its largest, with over 200 attorneys. Katten Muchin Rosenman is known for its work in corporate law, finance, litigation, and intellectual property law.
- Seyfarth Shaw LLP: Seyfarth Shaw is a national law firm with over 900 attorneys in offices across the United States. The firm’s Chicago office is its largest, with over 200 attorneys. Seyfarth Shaw is known for its work in labor and employment law, corporate law, litigation, and intellectual property law.

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The 7 Biggest Law Firm near Illinois
Ankin Law
- Address: 10 N Dearborn St #500, Chicago, IL 60602, United States
- Map: Click here
- Rating: 4.6 (1091)
- Phone: +1 312-500-7866
- Website: Link
- Opening hours:
Monday: Open 24 hoursTuesday: Open 24 hoursWednesday: Open 24 hoursThursday: Open 24 hoursFriday: Open 24 hoursSaturday: Open 24 hoursSunday: Open 24 hours - Reviews:
3 months agoI highly recommend! The whole process with Ankin Law was professional and required patience. The wait was well worth it and had a great outcome! I was not stressed with their help, they took care of everything and ensured I didn’t have to pay anything out of pocket. Thank you to everyone who helped me with my case and settled out my case i Truly appreciate you all! If you was looking into trying them out, DO IT!2 months agoWhen I was injured in a hit and run last year by a stolen vehicle, I had no choice than to recover from my damages through my insurance. I received so many calls from attorneys looking to gain my business. I turned them all down. I chose Ankin Law because of my familiarity with the Firm as I’ve seen Mr. Howard Ankin active on my job campus and speaking to many of the union members. He’s always kind and informative so there was no hesitation for me to reach out to his legal team. It was only right. I was connected with attorney Maria Merman. I initially misjudged her thinking she was too nice and not aggressive enough to go up against my own insurance. Oh boy was I wrong. It took time but it was well worth the wait especially considering how low the first offer from StateFarm was. She was able to get a best and final offer that surpassed the initial. She was great! And I recommend her and the Ankin Law team to all!a week agoThis is Bridget W. Raquel Gross was so thorough with my case. She fought really hard for me to get what I deserve. She is an excellent attorney, and I will recommend anyone who needs help with a personal injury case to have Raquel to represent them. Thank you, Raquel.a month agoI would like to thank Mr.Lax And Mrs.Griffith for helping me through one of the most challenging times in me and my family lives, being injured brings a ton anxiety and displacement , Mr.Lax insured me that he was 100% for me and fought for my respect and integrity It wasn’t easy however they remain transparent of the road that had to be traveled They both kept me updated and involved in the decision making process I’m grateful they recognized and represented the values and work ethic that I represented in myself. I got back. what I deserve but most importantly dignity and a reset .Thank you Both3 weeks agoAnkin Law is the real deal. I was in an Auto Accident and My Attorney; Maria Merman and her Assistant; Adriana Carrillo, were able to get me twice the gross Settlement being offered and they were able to get me a bigger net settlement by reducing all my Medical costs from what I was being charged. This was something I thought could not be done as I thought you paid for the cost of medical procedures at full price. what I really appreciated was how Maria guided through this process by educating me on how Auto Accident cases worked. I had never been in a Car Crash before and how all that worked in terms of getting my medical bills paid and so forth was new to me. Maria was very Knowledgeable and answered all my questions that I had. If anyone reading this review is looking for an Attorney who will fight for them, I would Recommend Maria Merman because she is a Warrior.
Malman Law
- Address: 505 W University Ave Suite 119, Champaign, IL 61820, United States
- Map: Click here
- Rating: 5 (1019)
- Phone: +1 312-629-0099
- Website: Link
- Opening hours:
Monday: Open 24 hoursTuesday: Open 24 hoursWednesday: Open 24 hoursThursday: Open 24 hoursFriday: Open 24 hoursSaturday: Open 24 hoursSunday: Open 24 hours - Reviews:
a week agoI would highly recommend them they were perfect I’m handling my case thank you so much for your hard work2 months agoAlexis did a great job, Paul came out handed my check hand delivered great experience, thank you guys !!!2 months agoPaul came out from the law firm. He was very professional and friendly delivered my documents in a timely manner. Highly recommend this law firm.a month agoMr. Paul has definitely come through he’s the super man????????2 months agoPaul came out on time and handed me my paperwork.It saved me time and money They all were very kind
I will recommend to all
Lerner and Rowe Injury Attorneys
- Address: 114 E Cermak Rd, Chicago, IL 60616, United States
- Map: Click here
- Rating: 4.9 (830)
Levin & Perconti
- Address: 325 N La Salle Dr Suite 300, Chicago, IL 60654, United States
- Map: Click here
- Rating: 4.7 (521)
M&A Law Firm, P.C.
- Address: 10 N Martingale Rd, Schaumburg, IL 60173, United States
- Map: Click here
- Rating: 4.9 (344)
Godoy Law Office Immigration Lawyers
- Address: 915 Harger Rd Suite 300, Oak Brook, IL 60523, United States
- Map: Click here
- Rating: 4.7 (316)
Gainsberg Law, P.C.
- Address: 77 W Washington St Suite 1215, Chicago, IL 60602, United States
- Map: Click here
- Rating: 4.9 (290)

Discover top consulting firms in various states, like those mentioned in Ohio, Georgia and North Carolina, to understand the dynamic business scene across the United States. These companies play a crucial role in shaping the vibrant business environment, positioning Illinois, USA as a center for strategic insights and cutting-edge solutions.
Top Law Firm Alternatives in Illinois
The Biggest Law Firm in United States
Illinois is home to many reputable law firms that offer a wide range of legal services. However, there are also several alternative options that have gained popularity in recent years. These alternatives provide clients with more flexible and cost-effective solutions for their legal needs. Here are three top law firm alternatives that are very popular in Illinois:
- 1. Legal Technology Platforms: Legal technology platforms like LegalZoom and Rocket Lawyer have revolutionized the way people access legal services. These online platforms offer a range of services, including legal document templates, DIY legal guides, and access to licensed attorneys for consultations. They are particularly beneficial for individuals or small businesses with straightforward legal needs, such as drafting contracts or creating wills. These platforms are convenient, affordable, and user-friendly, making them a popular choice for those who want to save time and money on legal matters.
- 2. Alternative Dispute Resolution (ADR) Providers: ADR providers offer alternative methods for resolving legal disputes outside of traditional courtroom litigation. Mediation and arbitration are the two most common types of ADR. Mediation involves a neutral third party (the mediator) who helps facilitate negotiations between the parties to reach a mutually satisfactory resolution. Arbitration, on the other hand, is more formal and involves a neutral third party (the arbitrator) who makes a final decision after hearing arguments from both sides. ADR providers are popular because they offer a faster and less expensive alternative to traditional litigation, and the process is generally more flexible and confidential. Many law firms in Illinois now offer ADR services alongside their traditional legal services.
- 3. Virtual Law Firms: Virtual law firms, also known as tele-law firms or online law firms, are law practices that operate entirely online. These firms provide legal services remotely through video conferencing, email, and other digital communication tools. Virtual law firms offer clients greater flexibility and convenience, as they eliminate the need for in-person meetings and physical office spaces. They often have lower overhead costs compared to traditional brick-and-mortar law firms, allowing them to offer more competitive pricing. Virtual law firms are particularly popular among tech-savvy clients who prefer the convenience of accessing legal services from anywhere at any time.
These three law firm alternatives have gained significant popularity in Illinois due to their convenience, cost-effectiveness, and flexibility. Whether individuals or businesses, these alternatives provide viable options for accessing legal services that meet their specific needs.
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