Rockwall County, Texas in the context of Heath, Texas

Dallas is a city in the U.S. state of Texas. Located in the state's northern region, it is the ninth-most populous city in the United States and third-most populous city in Texas, with a population of 1.3 million at the 2020 census. Along with nearby Fort Worth, Dallas anchors the Dallas–Fort Worth metroplex, which is the fourth-most populous metropolitan area in the U.S. and the most populous metropolitan area in Texas, at 7.5 million people in 2020. Dallas is a core city of the largest metropolitan area in the Southern U.S. and the largest inland metropolitan area in the U.S. that lacks any navigable link to the sea. It is the seat of Dallas County, covering nearly 386 square miles (1,000 km) and extending into Collin, Denton, Kaufman, and Rockwall counties.

Both Dallas and Fort Worth were initially developed as a product of the construction of major railroad lines through the area allowing access to cotton, cattle, and later oil in North and East Texas. The construction of the Interstate Highway System reinforced Dallas's prominence as a transportation hub, with four major interstate highways converging in the city and a fifth interstate loop around it. Dallas then developed as a strong industrial and financial center and a major inland port, due to the convergence of major railroad lines, interstate highways, and the construction of Dallas Fort Worth International Airport, one of the largest and busiest airports in the world. In addition, Dallas Area Rapid Transit (DART) operates rail and bus transit services throughout the city and its surrounding suburbs.

Rockwall is a city in the U.S. state of Texas and the county seat of Rockwall County. The U.S. Census Bureau estimates that as of 2023, Rockwall's population is 52,918, up from 47,251 in the 2020 census. The name Rockwall is derived from a naturally jointed geological formation, which has the appearance of an artificial wall.

Royse City is a city in Rockwall County in the U.S. state of Texas. It also extends into Collin and Hunt counties. The population was 2,957 at the 2000 census, rising to 9,349 in 2010. The estimated population in 2018 was 12,998. In 2020, its population grew to 13,508.

Fate is a city located in the center of Rockwall County, Texas, United States. The population in 2020 was 17,958, an increase from 6,357 in 2010, and 602 in 2000. In 2022, Fate's population was estimated to have grown to just under 23,000.

McLendon-Chisholm is a city in Rockwall and Kaufman counties, Texas, United States. The population was 1,373 at the 2010 census.

Mobile City is a city in Rockwall County, Texas, United States on the outskirts of Rockwall. The population was 142 at the 2020 census. It currently has the highest population density of any city in Texas, and is the only Texas city (and the smallest city in the country) with a population density of over 10,000 people per square mile.

Rowlett (/raʊˈlɛt/, traditionally /ˈraʊlɪt/) is a city in Dallas and Rockwall Counties in Texas, United States, and an eastern suburb of Dallas. It is a growing, upscale community with nearly $1.5 billion in development in the Dallas–Fort Worth metroplex, located on Lake Ray Hubbard.

The population was 62,535 at the 2020 census, and according to 2023 census estimates, the city is estimated to have a population of 66,813.