Welcome the website for Grundy County Missouri.
Established January 29, 1841 from Livingston County, Grundy County, Missouri is named for Tennessee Senator and United States Attorney General, Felix Grundy.
Grundy County is located in the north/central region of the state of Missouri. The county seat of Grundy County is Trenton.
It is bordered on the north by Mercer County, on the east by Sullivan County, and on the southeast lies Linn County. It’s bordered on the south by Livingston County, to the southwest by Daviess County, and to the Northwest by Harrison County.

As of the 2021 census estimate Grundy County had a population of 9,720 persons.
Latest News..
- Tax bills have been mailed.Your 2023 tax bill has been mailed. If you have not yet received the bill…
- courthouse closed November 23rd and 24th.in observance of the thanksgiving holiday the courthouse in Trenton will be closed November 23rd…
- courthouse closed November 10th.in observance of veterans Day the grundy county courthouse will be closed November 10th 2023.
- Collector: 2023 Tax bills mailed soonThe 2023 Grundy County tax bills are being prepared and will be mailed around November…
- Bid solicitation: Snow removal.The Grundy County Commission is seeking bids for snow removal and ice melt applications for…
- Assessor office: Help wantedThe Grundy County Assessor’s Office is seeking candidates for the entry-level position of GIS Coordinator/Field…
- Offices closed Oct 9thState and county offices will be closed October 9th 2023 in observance of the Columbus…



