Process Serving in Wisconsin

Wisconsin’s circuit courts are the state’s trial courts and have original jurisdiction over civil and criminal matters. They operate in branches across the counties, with certain counties sharing judges. Civil process is governed by Wisconsin statutes, including the rules for who may serve a summons and how it may be delivered. County circuit courts handle civil actions, including matters that may have different procedures under specific statutes. Court Runner USA connects you with process servers who serve papers across Wisconsin.

General information, not legal advice. Last checked October 2026.

Sources:

• Wisconsin Circuit Courts
• Wis. Stat. § 801.10–.11

Wisconsin permits service of an authenticated summons by an adult resident of the state where service takes place, provided the server is not a party to the action. A person from Illinois, Iowa, Michigan or Minnesota who is an adult and not a party may also serve an authenticated summons in Wisconsin. Service must be made with reasonable diligence. A sheriff or deputy may serve process, and Wisconsin law specifies that the sheriff’s or deputy’s official title must appear when that officer serves. The statutes cited here do not establish a statewide process-server license or certification requirement. Rules governing other kinds of papers, special proceedings or local court practices may differ; confirm the requirements for the particular process and county before arranging service.

Sources:

• Wis. Stat. § 801.10

For an individual, Wisconsin law allows personal delivery. If reasonable diligence does not permit personal service, a summons may be left at the person’s usual abode with a competent family member at least 14 years old, or a competent adult who currently lives there; the recipient must be told what the summons contains. Publication and mailing are available after reasonable diligence fails to achieve personal or substituted service. If the address is known or can be found with reasonable diligence, the summons and complaint must be mailed at or immediately before the first publication. Corporations and LLCs may be served through an officer, director or managing agent, or under another applicable statute through an authorized agent. The applicable statutes also provide service routes for partnerships, public entities and insurers. Registered-agent service is governed by entity-specific law; subpoenas and other specialized process may have distinct rules.

Sources:

• Wis. Stat. § 801.11
• Wis. Stat. § 180.1510

A Wisconsin civil action seeking a personal judgment is commenced against a defendant when the summons and complaint are filed, provided authenticated copies are served under the applicable chapter within 90 days after filing. The usual deadline to answer is 20 days after service of the complaint. The period is 45 days when the defendant is the state or a covered state officer, employee, agent or agency, when a defendant is an insurer, or when a claim is founded in tort. A summons served by publication uses the response date stated in the summons, which must be at least 40 days after the first required publication. Wisconsin law requires the server to deliver proof to the person who requested service, who must promptly file it. These general civil deadlines may not govern proceedings with special statutory rules.

Sources:

• Wis. Stat. § 801.02
• Wis. Stat. § 801.09
• Wis. Stat. § 802.06
• Wis. Stat. § 801.10

A person serving an authenticated summons must be an adult and must not be a party to the action, subject to Wisconsin’s stated allowance for qualifying adult residents of Illinois, Iowa, Michigan and Minnesota serving in Wisconsin. The statute calls for reasonable diligence in making service. For substituted service at an individual’s abode, the recipient must meet the statutory age and competency conditions and be informed of the summons’s contents. Wisconsin’s civil summons provisions do not state a general time-of-day restriction in the sections cited here. The separate rules for computing procedural deadlines provide that a period whose last day falls on a Saturday, Sunday or legal holiday is extended; that deadline-calculation rule is not itself a rule about when a server may deliver process. Check any special proceeding or court order for additional terms.

Sources:

• Wis. Stat. § 801.10–.11
• Wis. Stat. § 801.15

At the time of service, the server must sign the summons and note the time and date, place, manner of service and the person served. A sheriff or deputy must also state the officer’s official title. The server must make and deliver proof of service to the person on whose behalf service was made; that person must promptly file it. If service is challenged, Wisconsin law describes the proof that may be required: an affidavit for personal or substituted personal service, a sheriff’s or deputy’s certificate in the specified circumstances, or affidavits documenting publication and mailing. The affidavit for personal or substituted service includes the time, date, place and manner, server eligibility, identification and delivery details, and, for substituted service, where and with whom the papers were left and facts showing reasonable diligence. The statute does not make failure to file proof invalidate otherwise valid service.

Sources:

• Wis. Stat. § 801.10