Summit is an unincorporated community in eastern Washington County, in the U.S. state of Missouri.
The community is situated on a ridge (elevation 1007 feet) at the intersection of Missouri Route 8 and the Missouri Pacific Railroad line. Potosi is approximately 4.5 miles to the northwest on Route 8.[1]
A variant name was "Summitville". A post office called Summitville was established in 1882, the name was changed to Summit in 1886, and the post office closed in 1928.[2] Summit is so named on account of the lofty elevation of the site.[3]