Resident Population in Grimes County, TX was 32.38400 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Grimes County, TX reached a record high of 32.38400 in January of 2023 and a record low of 11.85500 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Grimes County, TX - last updated from the United States Federal Reserve on May of 2024.