Ontonagon County, Michigan

• Marriage licenses, local vital records, and elections

  Ontonagon County clerk

  Start with the clerk for a marriage license, a county-filed birth or death record, election information, and other county records.

  Open the official county site(opens in a new tab)-> Getting married in Michigan->

• Deeds, mortgages, and recorded land documents

  Ontonagon County register of deeds

  Use this office for recorded property documents. It does not decide ownership disputes or tell you whether a deed is legally sufficient.

  Open the state office list(opens in a new tab)-> Michigan land and property guide->

• Delinquent real-property tax and foreclosure questions

  Ontonagon County treasurer

  Current bills usually begin with the city or township treasurer. After the local collection period, delinquent real-property tax moves to the county or the state foreclosing unit.

  Open the official county site(opens in a new tab)-> Michigan property-tax basics->

• Private wells, septic systems, and local health services

  Local health department

  Michigan has county and multi-county health departments. Use the state finder to see which department serves this county before applying or making an appointment.

  Find the local health department(opens in a new tab)-> Michigan well and septic guide->

• District, circuit, probate, or family-court business

  Michigan trial courts serving this county

  The court depends on the case type and sometimes the city or district. The judiciary directory lists court locations, websites, and contact information by county.

  Find the right trial court(opens in a new tab)->

• Countywide assessment data and equalization

  Ontonagon County equalization

  Your local assessor and Board of Review handle an individual parcel first. County equalization studies values across local units and supports assessment administration.

  Open the official county site(opens in a new tab)-> How to appeal a Michigan assessment->

County websites are checked against the State of Michigan county website directory . State and court finders are used where one office or district can serve more than one county. Directory reviewed July 12, 2026. Office roles were checked against Michigan Vital Records, Michigan Treasury taxpayer resources, and State Tax Commission guidance.