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In 1848, approximately 70 followers of the French utopian socialist Etienne Cabet arrived in what is now Justin to found an Icarian community. The attempt failed.
Contrary to popular belief, the town is not named after or related to the Justin Boot Company. In January 1887 the community petitioned postal authorities for a post office to be named Justin, in honor of Justin Sherman, a chief engineer with the Santa Fe Railroad.
The Texas Motor Speedway had a Justin mailing address until July 9, 2005. Because it is physically located in the city of Fort Worth, the United States Postal Service changed the mailing address to Fort Worth, Texas.
WFAA-TV, Channel 8 operates a 750,000 watt doppler radar out of Justin since January 25,1995.
According to the United States Census Bureau, the city has a total area of 2.4 square miles (6.1 km²), all of it land.
Some areas of Justin along FM 156 and Hwy 114 use the Justin ZIP code (76247) even though the land is owned by the City of Fort Worth.