Rockwall is a city in Rockwall County, Texas, United States, and a suburb of Dallas and part of the Dallas/Fort Worth Metroplex. It is the county seat of Rockwall County,[3] which is the third wealthiest county in the state of Texas. 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 wallVisit RockwallInRealTime.com for News, Events, Reviews, Updates, and Entertainment all about Rockwall, TX.