[6] Hart became an organized town in 1925 after the Fort Worth and Denver South Plains Railway announced plans to establish a depot at the site.

[6] Hart is located in southeastern Castro County at 34°23′12″N 102°6′54″W / 34.38667°N 102.11500°W / 34.38667; -102.11500 (34.386723, –102.115035),[7] along Texas State Highway 194.

According to the United States Census Bureau, Hart has a total area of 0.73 square miles (1.9 km2), all land.

[8] As of the 2020 United States census, there were 869 people, 313 households, and 249 families residing in the city.

A rare type of meteorite unique to the Western Hemisphere was discovered near Hart in March 2010.

A field worker found a single, large, dense brownish stone weighing 966 grams beside a road located 0.25 miles from the town of Hart.

The stone was analyzed at the University of Washington and was classified as a Carbonaceous Chondrite (CK3), the most massive example of one of 25 known specimens in the world.