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Stonefort is a village located mainly in Saline County, Illinois, with a portion of the village extending into Williamson County.

Stonefort is named for an ancient rock fortification that stood in the vicinity when the first settlers arrived in the early 1800s; the fort's builders have variously been claimed to be Spanish soldiers of the sixteenth century, an aboriginal people who preceded the Indians, or George Rogers Clark's company on its 1778 march to Kaskaskia.

The original village of Stonefort was established in the late 1850s near the edge of a bluff, and it became a post office on February 15, 1858, with Willis Stucker as its first postmaster.

When the Cairo and Vincennes Railroad was completed through the area in the 1870s, Stonefort's public buildings were dismantled and moved about a mile northwest to the village's present location beside the tracks; the abandoned original site is still shown as "Oldtown" on maps.

The relocated town was platted as Bolton in 1872 and incorporated as the village of Bolton on June 21, 1875, even though its post office and railroad station were called Stonefort, a confusion that lasted until 1936, when the village council determined that Stonefort would be the official name.

The 2020 census counted 224 people in Stonefort, down from 297 at the 2010 census.

Stonefort spreads its small population of 224 over about 1.46 square miles, a density of only about 154 people per square mile, and sits about 400 feet above sea level.