Circuit Court

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.


In response to public health concerns associated with the COVID-19 outbreak, access to the Circuit Court and Register in Probate’s Office is limited at this time.

  • Filing of court documents will continue to be processed via eFiling and by mail. Paper documents will NOT be accepted in person. Instead, please place the documents in the drop box located at the Security Station in the Justice Center. Be sure to include the appropriate filing fee, if applicable. These documents will be processed on a daily basis.
  • Payments can be made by placing in the drop box. Check or money order only, NO CASH PAYMENTS AT THIS TIME. You may also make payment online by using the WI Court’s payment system at; by using GovPay Now at, enter Pay Location Code (PLC) 4421 or 1-888-604-7888; or by calling the Register in Probate’s office at 920-294-4044.
  • Be sure to include your telephone number with all drop box submissions so that we may contact you if we have questions about your documents.
  • Requests for copies can be submitted in writing at our drop box, by email at, or by phone at 920-294-4044.
  • If you wish to review any probate files, please call the Register in Probate’s Office to schedule an appointment.
  • If you need further assistance, please contact the Register in Probate’s Office at 920-294-4044.


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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Register in Probate

The Register in Probate oversees the Probate Court. Probate is the court-supervised process for the orderly transfer of a decedent’s assets to those who are entitled to them. The process ensures that notice is properly given, that all debts, taxes, and expenses are paid, that the assets are distributed in accordance with the last Will or to the heirs as determined by statute.

Register in Probate
Casandra Ewerdt
(920) 294-4044

A guide on informal probate

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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