Williams Grove is an unincorporated community in Monroe Township, Cumberland County, Pennsylvania, United States.

[2] In 1850, they began hosting picnics on their property, in a grove next to the Yellow Breeches Creek.

On May 22, 1989, two men who lived at the Williams Grove Mobile Home Park tossed illegal fireworks onto the roof of Ashcombe's.

[5] In 2007, Williams Grove Historical Steam Engine Association purchased a 90-acre plot of land that they had previously been using for festivals.

This Cumberland County, Pennsylvania state location article is a stub.