Erie, MO

ERIE, a small post-village, capital of Camden county, Missouri, on the Osage river, just below the Niangua, 60 miles S. W. from Jefferson City. (Baldwin & Thomas, A New and Complete Gazetteer of the United States ... 1854) 

Note: "Erie was located in northern Osage T. on the S bank of the Osage R. It was the county seat from 1841 to 1855, after which it was largely abandoned. It was originally called Oregon."  (USGS)