Grimes County, Texas

Grimes County
The Grimes County Courthouse in Anderson
Location within the U.S. state of Texas
Texas's location within the U.S.
Coordinates: 30°33′N 95°59′W / 30.55°N 95.98°W / 30.55; -95.98
Country United States
State Texas
Founded1846
Named afterJesse Grimes
SeatAnderson
Largest cityNavasota
Area
  Total
802 sq mi (2,080 km2)
  Land787 sq mi (2,040 km2)
  Water14 sq mi (40 km2)  1.8%
Population
 (2020)
  Total
29,268
  Density36/sq mi (14/km2)
Time zoneUTC−6 (Central)
  Summer (DST)UTC−5 (CDT)
Congressional district10th
Websitegrimescountytexas.gov

Grimes County is a county located in southeastern Texas, United States. As of the 2020 census, its population was 29,268. The seat of the county is Anderson. The county was formed from Montgomery County in 1846. It is named for Jesse Grimes, a signer of the Texas Declaration of Independence and early European-American settler of the county.

The Navasota and Brazos Rivers form the western boundary of the county. Eastern areas of the county are part of the watershed of the San Jacinto River.