The City of Rockwall is the county seat of Rockwall County, Texas. Rockwall County is the smallest county in the state. Don’t let Rockwall fool you. There is a lot gong on in this city and in this county, which lies just east of Dallas-Fort Worth. In fact, Rockwall County is one of the fastest growing counties in the United States.When Rockwall County began to expand, so did the local governance’s view of the future. Concerned citizens like the quality of life in Rockwall. When Rockwallians considered growth, they first looked to the future. Development means change but as long as change is in the cards, it had to be positive change, change with a future.