Philadelphia is an unincorporated community and census-designated place in western Marion County, Missouri, United States.

[7] Philadelphia was first listed as a census-designated place for the 2020 census, at which time it had a population of 206.

Hannibal, the largest city in Marion County, is 25 miles (40 km) to the southeast on the Mississippi River.

According to the U.S. Census Bureau, the Philadelphia CDP has an area of 0.76 square miles (1.97 km2), all land.

This Marion County, Missouri state location article is a stub.