[2] It has an estimated elevation of 427 feet (130 m) above sea level, and is served by the Warminster Post Office ZIP code of 18974.

Hartsville was named for Colonel William Hart, who served during the Revolutionary War.

After relocating to the village during the late 1700s, he opened a new inn which he called "The Sign of the Hart.

[8] A collection in the Metropolitan Museum of Art includes an 1843 cut-paper silhouette portrait of a Hartsville resident identified as Mrs. James P.

[10][11] In 2019, water from private wells in the community was reportedly unsafe to drink because of contamination by per- and polyfluoroalkyl substances (PFAS) chemicals, possibly from toxic waste from closed military facilities nearby.