Red Hill is a borough in Montgomery County, Pennsylvania, United States. It is primarily a lakeshore, lowlands, suburban community northwest of Philadelphia in the Delaware River Valley watershed, as is the balance of its county. Its population was 2,383 at the 2010 census. Red Hill is served by the Upper Perkiomen School District. It is also part of the strip of small towns that run together along Route 29, Red Hill, Pennsburg, and East Greenville, colloquially known as East Penn Hill.