Sidley Austin LLP
Headquartered in Chicago, Illinois, Sidley Austin LLP employs 1,693 lawyers across the United States, according to The Law360 400 (2026).
- Office
- Chicago, Illinois
- Website
- sidley.com
- Practice areas
- Appellate, International trade
- Size
- 1,693 lawyers in the United StatesFirm-wide count, The Law360 400 (2026)
- Headquarters
- This office
- Traces its history to
- 1866
Chicago, Illinois
Is this your firm?
Send corrections to hello@lawfirmwebagency.com. And if your website is not winning the clients this listing sends you, we can fix that in seven days.
About Sidley Austin LLP
Headquartered in Chicago, Illinois, Sidley Austin LLP employs 1,693 lawyers across the United States, according to The Law360 400 (2026). Its main areas of practice include appellate and international trade.
It is one of 83 law firms we list in Chicago and one of 396 across Illinois. By U.S. lawyer headcount, it ranks number 3 among the firms we list with an office in Chicago. Chapman and Cutler LLP is listed at nearly the same location.
The firm's website is sidley.com.
Firm profile
Multinational law firm founded in Chicago in 1866 and headquartered at One South Dearborn in the Loop, with about 2,300 lawyers in 21 offices in North America, Europe, Asia and Australia. Its practice includes appellate and international trade work.
Sidley Austin LLP traces its history to 1866.
Source: en.wikipedia.org
Areas of practice
- Appellate
- International trade
From the firm's published profile.
Check a Lawyer's License in Illinois
Lawyers who practice in Illinois are licensed by Attorney Registration and Disciplinary Commission of the Supreme Court of Illinois. Before you hire anyone at Sidley Austin LLP, confirm that the lawyer is licensed and in good standing with its Lawyer Search.
Lawyer SearchLaw Firms Near Sidley Austin LLP
Largest Law Firms in Chicago
See all 83- 01Kirkland & Ellis LLP3,629 U.S. lawyersHeadquarters
- 02Greenberg Traurig, LLP2,364 U.S. lawyers360 North Green Street
- 03McDermott Will & Schulte LLP1,370 U.S. lawyersHeadquarters
- 04Morgan & Morgan1,270 U.S. lawyers55 East Monroe Street
- 05Mayer Brown LLP1,190 U.S. lawyersHeadquarters
- 06Seyfarth Shaw LLP908 U.S. lawyersHeadquarters
- 07Winston Taylor LLP908 U.S. lawyersHeadquarters
- 08Katten Muchin Rosenman LLP598 U.S. lawyersHeadquarters
Sidley Austin LLP: Questions and Answers
- Where is Sidley Austin LLP located?
- Sidley Austin LLP is in Chicago, Illinois.
- How do I contact Sidley Austin LLP?
- The firm's website is sidley.com.
- What kind of law does Sidley Austin LLP practice?
- Appellate and International trade. From the firm's published profile.
- How many lawyers does Sidley Austin LLP have?
- Sidley Austin LLP has 1,693 lawyers in the United States, according to The Law360 400 (2026). That count covers the whole firm, not only its Chicago office.
- Where is Sidley Austin LLP headquartered?
- Sidley Austin LLP is headquartered in Chicago, Illinois. This office is its headquarters.
- When was Sidley Austin LLP founded?
- Sidley Austin LLP traces its history to 1866, counting the oldest firm it grew from.
- Which law firms are near Sidley Austin LLP?
- The closest firms in the directory are Chapman and Cutler LLP (same location), Hinshaw & Culbertson LLP (same location) and Jenner & Block LLP (same location).
- How can I check that a lawyer at Sidley Austin LLP is licensed?
- Lawyers in Illinois are licensed by Attorney Registration and Disciplinary Commission of the Supreme Court of Illinois. Use its Lawyer Search at iardc.org to confirm a lawyer is licensed and in good standing.
Listing from © OpenStreetMap contributors, lawyer count from The Law360 400 (2026), last checked October 2026. LawFirmWebAgency is not affiliated with this firm, and a listing is not an endorsement or a measure of quality.
Is your firm the one people find first in Chicago?
Your listing tells a prospective client where you are. Your website decides whether they call. We build law firm websites that win that decision, live in seven days, with no monthly retainer.
- Where we work
- All 50 states
- Reply
- Within one business day