Rockwall is located in Rockwall County, Texas and a suburb of Dallas and part of the Dallas/Fort Worth Metroplex. It is the county seat of Rockwall County. As the second wealthiest county in the state of Texas in terms of median income, the majority of its residents enjoy a relatively high standard of living. The population was 37,490 at the 2010 census. The name Rockwall is derived from a naturally jointed geological formation, which has the appearance of an artificial wall.
The median income for a household in the city was $65,411, and the median income for a family was $75,121. Males had a median income of $55,370 versus $35,139 for females. The per capita income for the city was $29,843. About 3.2% of families and 3.9% of the population were below the poverty line, including 4.6% of those under age 18 and 3.0% of those age 65 or over.