 PA 124 was designated in 1928 to run from PA 74 in York east to U.S. Route 222 (US 222) in Lancaster.The route ran east to Craley before it continued southeast to the York Furnace area, where it crossed the Susquehanna River.From here, PA 124 continued northeast through Lancaster County along Pequea Boulevard, Marticville Road, Penn Grant Road, and New Danville Pike to Lancaster.