Richland Hills is a city in Tarrant County, Texas, United States. The population was 8,132 at the 2000 census. According to the United States Census Bureau, the city has a total area of 3.2square miles (8.2Square kilometers), all of it land. As of the census of 2000, there were 8,132 people, 3,197 households, and 2,196families residing in the city. The population density was 2,584.6people per square mile (996.8Square kilometers). There were 3,334housing units at an average density of 1,059.6per square mile (408.7Square kilometers).