Summer Hill is an unincorporated village located in the U.S. state of Illinois. It is within Pike County, U.S. Route 54 goes through the town. It coordinates at 39°32′47″N 90°55′09″W. In 1845, Summer Hill was founded by a local merchant named Lyman Scott. As of the 2000 census data, it had a total population of 250. It has Zip code 62363.