Gap is a census-designated place (CDP) and unincorporated community in Salisbury Township, Lancaster County, Pennsylvania, United States, with a ZIP code of 17527.

[4] U.S. Route 30 passes through the town, which is also the terminus for four Pennsylvania highways: 772, 741, 897, and the heavily used 41, which leads toward Wilmington, Delaware.

[7] From 1792, the Rising Sun Tavern stood on the Philadelphia–Lancaster Pike (which is now U.S. Route 30) and had a small village with blacksmith shop.

[8] Most of the buildings stood until circa 2020–2021, when they were removed for redevelopment; the site now contains a large convenience store and gas station.

[9] Nearby to the west, and traditionally closely associated with Gap, is White Chimneys, a country estate that began as a Church Dutch family farm much like any other in the area but eventually became known for wealth because it was the home of the Slaymaker family, who owned the Slaymaker Lock Company of Lancaster City.

The community occupies the center of the gap and extends northward downslope into Salisbury Township.

According to the United States Census Bureau, the CDP has a total area of 2.8 square miles (7.3 km2), of which 2.0 acres (7,943 m2), or 0.11%, are water.

Pennsylvania Route 41 begins in Gap at US 30 and leads southeast 30 miles (48 km) to the Wilmington, Delaware, area.

It leads northwest 21 miles (34 km) to Lititz, passing through Intercourse, Leola, Brownstown, and Rothsville along the way.

Pennsylvania Route 741 starts at the intersection of PA 41 and Bridge Street in the center of the gap.

The fire company was originally located atop Pequea Avenue by their water refilling area.

The Gap Town Clock, built in 1892, is a Lancaster County Historic Preservation Trust Site.