Johnston is a town in Edgefield County, South Carolina, United States.

The town's official welcome sign states that it is "Peach Capital of the World".

Johnston is called The Hub of the Ridge because it is located at the meeting place of the three river systems which flow away from the Ridge, a fertile plateau about 30 miles (48 km) long between clay hills to the north and sand hills to the south.

In 1791 as George Washington traveled through the area on his triumphal tour through the country, he stopped at the Lott family plantation, just east of Johnston.

Today, the Ridge produces about 60 percent of South Carolina's peaches.

[6] South Carolina Highway 23 passes through the center of town as Calhoun Street, leading southwest 8 miles (13 km) to Edgefield, the county seat, and northeast 4.5 miles (7.2 km) to Ward.

South Carolina Highway 121 (Lee Street) crosses SC 23 at the town center, leading north 12 miles (19 km) to Saluda and south 7 miles (11 km) to Trenton.

[8] As of the 2020 United States census, there were 1,997 people, 811 households, and 531 families residing in the town.