Circuit Court

Pursuant to the order of the Supreme Court filed May 21, 2021, Green Lake County Circuit Court has rescinded its Covid-19 Operational Plan.  Click the link below to review the order:

Counsel and/or an unrepresented party may request to appear by Zoom conference. However, this is subject to Court approval as some hearings require an in-person appearance. For criminal, family, and civil matters call 920-294-4142. For probate or juvenile matters call 920-294-4044.

The circuit court is the trial court of general jurisdiction in Wisconsin. It has original jurisdiction in both civil and criminal matters unless exclusive jurisdiction is given to another court. It also reviews state agency decisions and hears appeals from municipal courts. Jury trials are conducted only in circuit courts.

How to Participate in Remote Court Hearings


Slate, Mark T.
Circuit Court Judge

Judge Slate was born and raised in Markesan and graduated Markesan High School. He received an undergraduate degree from UW-Oshkosh and became a Police Officer in the City of Janesville. He went to Wisconsin Law School and upon graduation went into the practice of law with his father, Bill Slate, in Markesan where he practiced general law. In 2011 he ran for Circuit Court Judge and was elected to serve the citizens of Green Lake County.

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Family Court Commissoner

The Family Court Commissioner hears all Mediation Screenings, Temporary Orders in divorce cases and Stipulated Divorce Hearings. If you need to contact the Family Court Commissioner you can contact him by mail at the courthouse address, or call.

Conti, Henry

Mediation Request Form

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Circuit Court Commissioner

If you need to contact the Circuit Court Commissioner you can contact him by mail at the courthouse address, or call.

Blazel, John

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Past Judges of Green Lake County

Franklin B. Hawes

A.G. Myers

Thomas B. Ryan

J. Edmund Millard

Sherman G. Potter

Perry Nekern

George Ostrander

David C. Willis


W.M. McMonigal

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Court Reporters

Court reporters, although sometimes taken for granted because they are seldom heard or seen, play a critical function in the courtroom. Court reporters take a verbatim transcript of everything that happens in the courtroom.

Blair, Karen

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Local Court Rules

Green Lake County Small Claims Local Rules
(This rule shall be effective March 1, 2014)

I. Service of Summons. The Court authorizes service by mail, as allowed under Wis. Stat. 799.12(2) and in eviction proceedings by certified mail as allowed under Wis. Stat. 799.12(3). Contempt proceedings must be personally served.

II. Pleading. All pleadings shall be in writing. A defendant, or their attorney, may file an Answer, Counterclaim or Affirmative Defense with the Clerk of Court and opposing party at or before the return date, or, if appearing at the return date in person and orally claimed, within 10 calendar days of the return date. Failure to do so may result in a default judgment.

III. Personal Appearance. Parties do need not appear in person at the return date EXCEPT for evictions and contempt proceedings, which they MUST appear in person.

Other County Circuit Court Rules

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Contact Us

  • Office Hours:
    8:00am – 4:30pm
  • Address:
    571 County Road A
    Green Lake, WI 54941
  • Phone: 920-294-4044