License & bar number lookup
Wisconsin Attorney License Lookup
Search 26,361 attorneys registered with the State Bar of Wisconsin by name or bar number. Every record shows the official license status and as-of date.
How to verify a Wisconsin attorney
- Search the attorney by name or bar number in the search box above — it pulls the official State Bar of Wisconsin 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 bar number and admission year against anything the attorney told you.
Wisconsin attorneys — last name “O”
Active Wisconsin attorneys with last names starting “O.” Use the search box above for an exact name or bar number.
Larry W. O'Brien
WI attorney
- Bar #
- 1011472
- Admitted
- 1967 · 59 yrs
Sarah B. O'Brien
WI attorney
- Bar #
- 1017023
- Admitted
- 1974 · 52 yrs
Thomas C. O'Brien
WI attorney
- Bar #
- 1002481
- Admitted
- 1966 · 60 yrs
- Firm
- Law Offices of Thomas C O'Brien
Thomas W. O'Brien
WI attorney
- Bar #
- 1009330
- Admitted
- 1967 · 59 yrs
Diane K. O'Connor
WI attorney
- Bar #
- 1017853
- Admitted
- 1976 · 50 yrs
John O'Connor, V
WI attorney
- Bar #
- 1014548
- Admitted
- 1973 · 53 yrs
- Firm
- The Law Offices of John V O'Connor LLC
Kevin J. O'Connor
WI attorney
- Bar #
- 1016693
- Admitted
- 1976 · 50 yrs
- Firm
- Godfrey & Kahn Sc
Daniel J. O'Brien
WI attorney
- Bar #
- 1018324
- Admitted
- 1978 · 48 yrs
- Firm
- Wisconsin Department of Justice
Bruce M. O'Brien
WI attorney
- Bar #
- 1015367
- Admitted
- 1982 · 44 yrs
- Firm
- Higgs, Fletcher & Mack
James P. O'Brien
WI attorney
- Bar #
- 1006428
- Admitted
- 1983 · 43 yrs
- Firm
- Baker & McKenzie LLP
Dana L. O'Brien
WI attorney
- Bar #
- 1013006
- Admitted
- 1984 · 42 yrs
Michael D. O'Brien
WI attorney
- Bar #
- 1010012
- Admitted
- 1984 · 42 yrs
Philip R. O'Brien
WI attorney
- Bar #
- 1015549
- Admitted
- 1984 · 42 yrs
- Firm
- Reinhart Boerner van Deuren Sc
Daniel J. O'Brien
WI attorney
- Bar #
- 1005303
- Admitted
- 1986 · 40 yrs
- Firm
- Halling & Cayo Sc
Tamara Hayes O'Brien
WI attorney
- Bar #
- 1019189
- Admitted
- 1986 · 40 yrs
- Firm
- Husch Blackwell LLP
Judith O. O'Connell
WI attorney
- Bar #
- 1016440
- Admitted
- 1986 · 40 yrs
- Firm
- Burbach & Stansbury Sc
Barbara A. O'Brien
WI attorney
- Bar #
- 1018341
- Admitted
- 1987 · 39 yrs
Linda D. O'Brien
WI attorney
- Bar #
- 1011452
- Admitted
- 1987 · 39 yrs
John K. O'Connell
WI attorney
- Bar #
- 1010063
- Admitted
- 1987 · 39 yrs
- Firm
- John K O'Connell
Timothy Joseph O'Brien
WI attorney
- Bar #
- 1003571
- Admitted
- 1988 · 38 yrs
- Firm
- Bakke Norman Sc
John M. O'Boyle
WI attorney
- Bar #
- 1017287
- Admitted
- 1989 · 37 yrs
Sean D. O'Brien
WI attorney
- Bar #
- 1006459
- Admitted
- 1989 · 37 yrs
- Firm
- City of Schenectady
Meghan M. O'Callaghan
WI attorney
- Bar #
- 1001266
- Admitted
- 1990 · 36 yrs
- Firm
- The Northern Trust Company
Daniel W L O'Brien
WI attorney
- Bar #
- 1031717
- Admitted
- 1991 · 35 yrs
- Firm
- Daniel W L O'Brien Attorney At Law
Marta G. O'Brien
WI attorney
- Bar #
- 1019542
- Admitted
- 1992 · 34 yrs
- Firm
- Legacy Private Trust Co
Karine E. O'Byrne
WI attorney
- Bar #
- 1018157
- Admitted
- 1992 · 34 yrs
- Firm
- Milwaukee County District Attorney'S Office
Michael A. O'Brien
WI attorney
- Bar #
- 1090898
- Admitted
- 1993 · 33 yrs
- Firm
- O'Brien Law Offices PC
Mary T. O'Brien-Heinzen
WI attorney
- Bar #
- 1022788
- Admitted
- 1993 · 33 yrs
- Firm
- Renning Lewis & Lacy Sc
Andrea Renee O'Brien
WI attorney
- Bar #
- 1030755
- Admitted
- 1996 · 30 yrs
- Firm
- Kane County Judicial Center
Connie L. O'Connell
WI attorney
- Bar #
- 1026209
- Admitted
- 1996 · 30 yrs
- Firm
- O'Connell Law LLC
Dana O'Brien
WI attorney
- Bar #
- 1130061
- Admitted
- 1997 · 29 yrs
- Firm
- McCalla Raymer Leibert Pierce LLP
Chela Bordas O'Connor
WI attorney
- Bar #
- 1028186
- Admitted
- 1998 · 28 yrs
Jeffrey O'Brien
WI attorney
- Bar #
- 1058550
- Admitted
- 2000 · 26 yrs
- Firm
- Husch Blackwell
Erin E. O'Connor
WI attorney
- Bar #
- 1054888
- Admitted
- 2000 · 26 yrs
Margaret S. O'Connor
WI attorney
- Bar #
- 1030536
- Admitted
- 2000 · 26 yrs
- Firm
- O'Connor Law Office
Michael T. O'Brien
WI attorney
- Bar #
- 1077531
- Admitted
- 2002 · 24 yrs
- Firm
- Carroll County State Attorneys Office
Brandon G. O'Bryon
WI attorney
- Bar #
- 1036074
- Admitted
- 2002 · 24 yrs
- Firm
- O'Bryon Law Firm LLC
Caitlin M. O'Connell
WI attorney
- Bar #
- 1066382
- Admitted
- 2003 · 23 yrs
- Firm
- Jp Morgan Chase Bank Na
Caitlin M. O'Connor
WI attorney
- Bar #
- 1049535
- Admitted
- 2003 · 23 yrs
- Firm
- International Institute of St Louis
Michael James O'Brien
WI attorney
- Bar #
- 1079124
- Admitted
- 2004 · 22 yrs
- Firm
- O'Brien & Brasch Law Office LLC
Erin Maureen O'Connell
WI attorney
- Bar #
- 1135384
- Admitted
- 2004 · 22 yrs
Nicholas J. O'Connell
WI attorney
- Bar #
- 1054977
- Admitted
- 2004 · 22 yrs
- Firm
- Intact Insurance Group USA
Daniel A. O'Callaghan
Madison, WI
- Bar #
- 1042866
- Admitted
- 2005 · 21 yrs
- Firm
- Carlson Black O'Callaghan & Battenberg LLP
Donald James O'Brien
WI attorney
- Bar #
- 1053952
- Admitted
- 2006 · 20 yrs
- Firm
- Andrus Intellectual Property Law LLP
Timothy T. O'Connell
WI attorney
- Bar #
- 1063957
- Admitted
- 2006 · 20 yrs
- Firm
- O'Connell Law Office
Anna Gonis O'Connor
WI attorney
- Bar #
- 1091423
- Admitted
- 2006 · 20 yrs
- Firm
- Third Coast Lawyers LLC
Maureen S. O'Brien
WI attorney
- Bar #
- 1069402
- Admitted
- 2008 · 18 yrs
- Firm
- Ramsey County Attorney'S Office
Brandon P. O'Connor
WI attorney
- Bar #
- 1086864
- Admitted
- 2011 · 15 yrs
- Firm
- Ellison & O'Connor LLC
Matthew Michael O'Brien
WI attorney
- Bar #
- 1081789
- Admitted
- 2013 · 13 yrs
- Firm
- Department of Natural Resources
Karina O'Brien
WI attorney
- Bar #
- 1087946
- Admitted
- 2014 · 12 yrs
- Firm
- Kostner, Koslo & Brovold LLC
Kellen J. O'Brien
WI attorney
- Bar #
- 1101629
- Admitted
- 2014 · 12 yrs
- Firm
- Peckerman, Klein & van Kirk LLP
Shaun O'Connell
WI attorney
- Bar #
- 1090459
- Admitted
- 2014 · 12 yrs
- Firm
- State Public Defenders Office
Benjamin R. O'Connor
WI attorney
- Bar #
- 1144148
- Admitted
- 2015 · 11 yrs
- Firm
- Hilliard Law LLP
Edward F. O'Brien
WI attorney
- Bar #
- 1102526
- Admitted
- 2016 · 10 yrs
- Firm
- Mapfre USA Corp
Portia O'Bryant
WI attorney
- Bar #
- 1097544
- Admitted
- 2018 · 8 yrs
Angela O'Brien
WI attorney
- Bar #
- 1113069
- Admitted
- 2020 · 6 yrs
- Firm
- Wisconsin Elections Commision
Emily O'Brien
WI attorney
- Bar #
- 1115609
- Admitted
- 2021 · 5 yrs
- Firm
- Supreme Court of Michigan
Alex O'Connor
WI attorney
- Bar #
- 1121740
- Admitted
- 2022 · 4 yrs
- Firm
- M3 Insurance Solutions Inc
Madeline O'Connor
WI attorney
- Bar #
- 1125425
- Admitted
- 2022 · 4 yrs
- Firm
- Carlson Black O'Callaghan & Battenberg LLP
Seamus O'Connell
WI attorney
- Bar #
- 1148092
- Admitted
- 2026 · 0 yrs
- Firm
- Attolles Law Sc
Disciplinary actions
See Wisconsin attorney disciplinary actions (393 attorneys currently disbarred or suspended of record).
Frequently asked questions
How do I check if a lawyer is licensed in Wisconsin?
Search their name or bar number in the lookup above. It returns the official State Bar of Wisconsin record, including current license status and admission year. If no record comes back, the person may not be licensed in Wisconsin.
How many attorneys are registered in Wisconsin?
26,361 attorneys are registered with the State Bar of Wisconsin, and 26,163 are on active status. Every record here shows the official license status and as-of date.
Is Wisconsin attorney discipline public?
Yes. License status, including disbarment and suspension of record, is public information published by the State Bar of Wisconsin. 393 Wisconsin attorneys are currently disbarred or suspended of record.
What is a bar number?
A bar number is the unique ID the State Bar of Wisconsin assigns to each admitted attorney. It is the most reliable way to confirm you are looking at the right person, especially for common names.
Does this cost anything?
No. Looking up a Wisconsin attorney's license and disciplinary standing on this site is free and requires no account.
Data sources & last updated
- Licensing roster & status: State Bar of Wisconsin. Roster reconciled against the ABA resident-active benchmark below.
- 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.