Gray Summit is an unincorporated community and census-designated place (CDP) in Franklin County, Missouri, United States.

[6] Gray Summit is located in northeastern Franklin County along Missouri Route 100 and just north of Interstate 44.

Missouri Route 100 leads northwest approximately 11 miles (18 km) to Washington from the west end of Gray Summit.

There were 1,032 housing units at an average density of 138.8 per square mile (53.6/km2).

17.3% of all households were made up of individuals, and 5.9% had someone living alone who was 65 years of age or older.