Chappell Hill is an unincorporated community in the eastern portion of Washington County, Texas, United States. It is located inside Stephen F. Austin's original colony, and the land is some of the oldest Anglo-settled in the state. According to the Handbook of Texas, the community had a population of 600 in 2000. It is located within the Greater Houston me…Chappell Hill is an unincorporated community in the eastern portion of Washington County, Texas, United States. It is located inside Stephen F. Austin's original colony, and the land is some of the oldest Anglo-settled in the state. According to the Handbook of Texas, the community had a population of 600 in 2000. It is located within the Greater Houston metropolitan area.