License lookup

Illinois Attorney License Lookup

Search 206,900 attorneys registered with the Illinois Attorney Registration & Disciplinary Commission (ARDC) by name. Every record shows the official license status and as-of date.

206,900

currently registered attorneys

Illinois Attorney Registration & Disciplinary Commission publishes no single roster total; verified against the ABA resident-active benchmark (62,093)

84,758

on active status

reconciles to Illinois Attorney Registration & Disciplinary Commission 85,068 active/registered (-0.4%)

59,798+

active with a Illinois business address

lower bound; 2,746 actives have no address on file

How to verify a Illinois attorney

Search the attorney by name in the search box above — it pulls the official Illinois Attorney Registration & Disciplinary Commission (ARDC) record.
Confirm the license status reads "active" (not suspended, disbarred, inactive, or not eligible).
Check the disciplinary standing — disbarred or suspended is a public record you can see before you hire.
Cross-check the name, city, and admission year against anything the attorney told you. This state's public roster does not publish an official bar number here.

Illinois attorneys — last name “O”

Active Illinois attorneys with last names starting “O.” Use the search box above for an exact name.

Donald Allyn O'Brien

Geneva, IL

Active

ID: 0966728a-ab64-eb11-b810-000d3a9f4eeb
Admitted: 1977 · 49 yrs

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Dennis Sean O'Brien

Chicago, IL

Active

ID: 2ce9574d-ab64-eb11-b810-000d3a9f4eeb
Admitted: 1978 · 48 yrs

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James Vincent O'Brien

Brentwood, MO

Active

ID: b73da1bc-ab64-eb11-b810-000d3a9f4eeb
Admitted: 1980 · 46 yrs

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Jay Timothy O'Brien

Mokena, IL

Active

ID: 6ecc8e5f-ab64-eb11-b810-000d3a9f4eeb
Admitted: 1981 · 45 yrs

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Darren William O'Brien

Orland Park, IL

Active

ID: b9d54ac6-aa64-eb11-b810-000d3a9f4eeb
Admitted: 1983 · 43 yrs

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James Patrick O'Brien

Chicago, IL

Active

ID: e95322b5-a964-eb11-b810-000d3a9f4eeb
Admitted: 1983 · 43 yrs

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Norah A. O'Brian

West Bloomfield, MI

Active

ID: bb729859-ab64-eb11-b810-000d3a9f4eeb
Admitted: 1985 · 41 yrs

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Daniel Edward O'Brien

Geneva, IL

Active

ID: 29873aa3-a964-eb11-b810-000d3a9f4eeb
Admitted: 1989 · 37 yrs

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Gerard James O'Brien

Palatine, IL

Active

ID: 21fa2497-a964-eb11-b810-000d3a9f4eeb
Admitted: 1989 · 37 yrs

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Anne Maureen O'Brien

Chicago, IL

Active

ID: 866f19c7-a964-eb11-b810-000d3a9f4eeb
Admitted: 1991 · 35 yrs

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Daniel W. L. O'Brien

Carlinville, IL

Active

ID: d687029c-aa64-eb11-b810-000d3a9f4eeb
Admitted: 1991 · 35 yrs

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Candace Marie O'Brien

Miami, FL

Active

ID: 229adb21-aa64-eb11-b810-000d3a9f4eeb
Admitted: 1992 · 34 yrs

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Daniel Emmett O'Brien

Chicago, IL

Active

ID: 7d2e399d-a964-eb11-b810-000d3a9f4eeb
Admitted: 1992 · 34 yrs

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Dana Keone O'Banion

Rosemont, IL

Active

ID: c1fc10cd-a964-eb11-b810-000d3a9f4eeb
Admitted: 1993 · 33 yrs

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Brien Joseph O'Brien

IL attorney

Active

ID: fe14b927-ab64-eb11-b810-000d3a9f4eeb
Admitted: 1993 · 33 yrs

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Andrew A. O'Brien

Saint Louis, MO

Active

ID: 694521c1-a964-eb11-b810-000d3a9f4eeb
Admitted: 1995 · 31 yrs

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Brendan Alan O'Brien

IL attorney

Active

ID: 12981c91-a964-eb11-b810-000d3a9f4eeb
Admitted: 1996 · 30 yrs

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Charles Thomas II O'Brien

Stamford, CT

Active

ID: 0d8852f1-aa64-eb11-b810-000d3a9f4eeb
Admitted: 1997 · 29 yrs

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Cheryl L. O'Brien

Winnetka, IL

Active

ID: 5a9f520f-ab64-eb11-b810-000d3a9f4eeb
Admitted: 1997 · 29 yrs

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Dana N. O'Brien

Chicago, IL

Active

ID: 95f92497-a964-eb11-b810-000d3a9f4eeb
Admitted: 1998 · 28 yrs

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Daniel Mark O'Brien

Wilmette, IL

Active

ID: 82385d15-ab64-eb11-b810-000d3a9f4eeb
Admitted: 1998 · 28 yrs

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Donal Maurice O'Brien

Chicago, IL

Active

ID: 419f520f-ab64-eb11-b810-000d3a9f4eeb
Admitted: 1998 · 28 yrs

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Anthony Michael O'Brien

Chicago, IL

Active

ID: 182adbd8-aa64-eb11-b810-000d3a9f4eeb
Admitted: 2000 · 26 yrs

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Erin Elizabeth O'Brien

Chicago, IL

Active

ID: 6b0aa371-ab64-eb11-b810-000d3a9f4eeb
Admitted: 2000 · 26 yrs

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Barton James O'Brien

Chicago, IL

Active

ID: 191a9765-ab64-eb11-b810-000d3a9f4eeb
Admitted: 2002 · 24 yrs

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Andrew Patrick O'Brien

Chicago, IL

Active

ID: 48ea9a09-aa64-eb11-b810-000d3a9f4eeb
Admitted: 2003 · 23 yrs

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Bridget Kathleen O'Brien

Markham, IL

Active

ID: de1b9765-ab64-eb11-b810-000d3a9f4eeb
Admitted: 2004 · 22 yrs

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Colin Thomas Jefferson O'Brien

Chicago, IL

Active

ID: d3400de5-aa64-eb11-b810-000d3a9f4eeb
Admitted: 2004 · 22 yrs

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Daniel Joseph O'Brien

Springfield, IL

Active

ID: 0da47a03-aa64-eb11-b810-000d3a9f4eeb
Admitted: 2004 · 22 yrs

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Erin Webster O'Brien

Joliet, IL

Active

ID: 9d592fc0-aa64-eb11-b810-000d3a9f4eeb
Admitted: 2004 · 22 yrs

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Alexander Scott O'Brien

Kankakee, IL

Active

ID: 0b7019c7-a964-eb11-b810-000d3a9f4eeb
Admitted: 2006 · 20 yrs

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Elizabeth Ann O'Brien

Atlanta, GA

Active

ID: 8ca515df-aa64-eb11-b810-000d3a9f4eeb
Admitted: 2006 · 20 yrs

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Elizabeth Colsant O'Brien

Chicago, IL

Active

ID: 8b6843ae-aa64-eb11-b810-000d3a9f4eeb
Admitted: 2006 · 20 yrs

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Eleanor Kennedy O'Brien

Chicago, IL

Active

ID: 77a57a03-aa64-eb11-b810-000d3a9f4eeb
Admitted: 2008 · 18 yrs

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Shannon Frances O'Boye

Northbrook, IL

Active

ID: b58552f1-aa64-eb11-b810-000d3a9f4eeb
Admitted: 2009 · 17 yrs

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Erin Lucille O'Boyle

Springfield, IL

Active

ID: 2d5222b5-a964-eb11-b810-000d3a9f4eeb
Admitted: 2009 · 17 yrs

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Daniel Mark O'Brien

Chicago, IL

Active

ID: b80d00c9-ab64-eb11-b810-000d3a9f4eeb
Admitted: 2009 · 17 yrs

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Conor Logan O'Brien

Denver, CO

Active

ID: 5d1832a9-a964-eb11-b810-000d3a9f4eeb
Admitted: 2010 · 16 yrs

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Erin Elizabeth O'Brien

Chicago, IL

Active

ID: 650e00c9-ab64-eb11-b810-000d3a9f4eeb
Admitted: 2011 · 15 yrs

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Claire Kaltenbach O'Brien

St. Louis, MO

Active

ID: cc024ffd-aa64-eb11-b810-000d3a9f4eeb
Admitted: 2013 · 13 yrs

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Emily O'Brien

Chicago, IL

Active

ID: 55df248b-a964-eb11-b810-000d3a9f4eeb
Admitted: 2013 · 13 yrs

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Susan E. O'Banion

Riverwoods, IL

Active

ID: 68f4f37d-ab64-eb11-b810-000d3a9f4eeb
Admitted: 2014 · 12 yrs

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Jason Charles O'Brien

Fpo

Active

ID: 5dcf5aeb-aa64-eb11-b810-000d3a9f4eeb
Admitted: 2014 · 12 yrs

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Jennifer Lynn O'Brien

Alexandria, VA

Active

ID: 2b0d5df7-a964-eb11-b810-000d3a9f4eeb
Admitted: 2014 · 12 yrs

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Casey Kathleen O'Brien

Minneapolis, MN

Active

ID: 20981c91-a964-eb11-b810-000d3a9f4eeb
Admitted: 2017 · 9 yrs

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Daniel Richard O'Brien

St. Louis, MO

Active

ID: 9ba5920f-aa64-eb11-b810-000d3a9f4eeb
Admitted: 2017 · 9 yrs

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Jeffrey Michael O'Brien

Quncy, IL

Active

ID: 1a2e399d-a964-eb11-b810-000d3a9f4eeb
Admitted: 2018 · 8 yrs

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Donncha O Tuama

Dallas, TX

Active

ID: 86264a09-ab64-eb11-b810-000d3a9f4eeb
Admitted: 2019 · 7 yrs

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Sean Patrick O Sullivan

Lebanon, TN

Active

ID: 7060683a-ab64-eb11-b810-000d3a9f4eeb
Admitted: 2020 · 6 yrs

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David Joseph O Connor

Chicago, IL

Active

ID: d42c2fd1-7848-ec11-b842-000d3a90a8fc
Admitted: 2021 · 5 yrs

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Kaitlyn Marie O'Boye

Chicago, IL

Active

ID: 5ee920ab-71b2-eb11-b81e-000d3a9f4eeb
Admitted: 2021 · 5 yrs

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Ashlyn Christine O'Brien

Morrisville, NC

Active

ID: d0024aeb-71b2-eb11-b81e-000d3a9f4eeb
Admitted: 2021 · 5 yrs

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Camille O'Brien

Chicago, IL

Active

ID: 705cb3d9-70de-eb11-b82f-000d3a907e09
Admitted: 2021 · 5 yrs

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Emily A. O'Brien

Lansing, MI

Active

ID: 09302fd1-7848-ec11-b842-000d3a90a8fc
Admitted: 2021 · 5 yrs

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James Patrick O'Brien

Chicago, IL

Active

ID: 77302fd1-7848-ec11-b842-000d3a90a8fc
Admitted: 2021 · 5 yrs

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Jeffrey O'Boyle

Wheaton, IL

Active

ID: 7aac629b-eb6c-ed11-b85c-000d3a90a8fc
Admitted: 2022 · 4 yrs

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Seamus O Connor

Arlington Heights, IL

Active

ID: 5646c806-ffbe-f011-b8ac-000d3a92ce24
Admitted: 2025 · 1 yr

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Matthew James O'Boyle

Chicago, IL

Active

ID: e849c806-ffbe-f011-b8ac-000d3a92ce24
Admitted: 2025 · 1 yr

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Catherine Rose Clinton O'Brien

Chicago, IL

Active

ID: e047c806-ffbe-f011-b8ac-000d3a92ce24
Admitted: 2025 · 1 yr

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Robert Ames O'Boyle

Chicago, IL

Active

ID: f5a99801-ef55-f111-b8c7-000d3a92ce24
Admitted: 2026 · 0 yrs

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Disciplinary actions

See Illinois attorney disciplinary actions (2,992 attorneys currently disbarred or suspended of record).

Frequently asked questions

How do I check if a lawyer is licensed in Illinois?

Search their name in the lookup above. It returns the official Illinois Attorney Registration & Disciplinary Commission (ARDC) record, including current license status and admission year. If no record comes back, the person may not be licensed in Illinois.

How many attorneys are registered in Illinois?

206,900 attorneys are registered with the Illinois Attorney Registration & Disciplinary Commission (ARDC), and 84,758 are on active status. Every record here shows the official license status and as-of date.

Is Illinois attorney discipline public?

Yes. License status, including disbarment and suspension of record, is public information published by the Illinois Attorney Registration & Disciplinary Commission (ARDC). 2,992 Illinois attorneys are currently disbarred or suspended of record.

Does this cost anything?

No. Looking up a Illinois attorney's license and disciplinary standing on this site is free and requires no account.

Data sources & last updated

Licensing roster & status: Illinois Attorney Registration & Disciplinary Commission (ARDC). Published active-attorney total (2025 Annual Report).
Resident-attorney benchmark: ABA National Lawyer Population Survey 2024.
Data on this page as of 2026-06-13 (last roster ingest).

This site republishes official public records and is not legal advice, a lawyer referral service, or a consumer reporting agency. Information here may not be used to make decisions about employment, tenancy, or credit (FCRA). Records are shown as published by their official sources and may contain errors or be out of date; consult the linked official source to verify. To correct or dispute a record, contact the licensing authority of record.