Hartford is a city in Sebastian County, Arkansas, United States.

According to the United States Census Bureau, the city has a total area of 1.8 square miles (4.7 km2), all land.

By 1891 there were several businesses, a public school, and a Union Church edifice used respectively by Methodists, Baptists, and Cumberland Presbyterians.

[5] A labor conflict known the Hartford coal mine riot occurred in and around the town on July 12, 1914.

The city was also home to significant mining activity, which has returned to a limited extent.

Hartford is the home of the last working coal mine in the state of Arkansas.

[10] West Hartford is a populated place to the southwest, about halfway to the Oklahoma state border.

The National Register of Historic Places-listed Sebastian County Road 4G Bridge is nearby.