is a city in Clinton County, Missouri, along the Little Platte River. The population was 2,354 at the 2000 census. It is the county seat of Clinton County. Originally, the city was called Concord, which is currently still the name of the man-made lake and surrounding housing development there. Later the city was re-named Springfield until it was discovered there was already a Springfield, Missouri. The name "Plattsburg" was borrowed from Plattsburgh, New York, which is the county seat of Clinton County, New York which in turn was named for George Clinton (who is the namesake for Clinton County, Missouri).
Plattsburg is located at (39.564311, -94.453395). According to the United States Census Bureau, the city has a total area of 3.6 square miles (9.2 km²), of which, 3.5 square miles (9.2 km²) of it is land and 0.04 square miles (0.1 km²) of it (0.84%) is water.