Originally a mobile home park outside of city limits, it was incorporated on January 25, 1990 so that a beer, wine, and liquor store could open.

After incorporation, the roads through the park were paved for the first time and full-time security was provided to the residents at no charge to them.

Until fall 2007 it was the only city within Rockwall County that allowed alcohol sales (excluding restaurants).

[5] According to the United States Census Bureau, the city has a total area of 0.02 square miles (0.052 km2), all land.

Mobile City is served by the Rockwall Independent School District.