Grundy County is a county located in the U.S. state of Missouri. As of the 2020 census, the population was 9,808. Its county seat is Trenton. The county was organized January 2, 1841, from part of Livingston County, Missouri and named after U.S. Attorney General Felix Grundy.
Geography
According to the U.S. Census Bureau, the county has a total area of , of which is land and (0.6%) is water.
Adjacent counties
- Mercer County (north)
- Sullivan County (east)
- Linn County (southeast)
- Livingston County (south)
- Daviess County (southwest)
- Harrison County (northwest)
Major highways
- 20px U.S. Route 65
- 20px Route 6
- 20px Route 128
- 20px Route 139
- 20px Route 146
- 20px Route 190