Bladensburg is a small unincorporated community in Wapello County, Iowa, United States. It lies midway between Agency and Batavia at a distance of from each, and the largest nearby city is Ottumwa, to the west-southwest.
The village of Bladensburg was established in 1853. It had a post office from 1855 to 1906.
Bladensburg's population was 82 in 1902, and 39 in 1925. The population was 39 in 1940.