NULL Of 254 counties in the state, Grimes County is 203rd in terms of its size (801 square miles). Grimes County is in Brazos Texas. Grimes County, Texas, has approximately 1,000 acres of riverfront land and property for sale based on recent Land Network data. The combined market value of farms and ranches for sale here was approximately $6 million. Browse all waterfront property for sale in Grimes County on the Land Network to find the marina, lakefront and other recreational property that meets your needs, from waterside land perfect as a retirement investment to existing residential waterfront land and property for hunting, fishing and other outdoor-recreation pursuits! The most common type of land for sale by combined acreage in Grimes County is undeveloped land.