Saint Charles (also known as Isis) [ citation needed ] is an unincorporated community in Butler County, in the U.S. state of Ohio. [1]
A post office called Saint Charles was established in 1850, and remained in operation until 1905. [2] The U.S. Geographic Names Information System (GNIS) lists the historical location of the post office at 39°23′30″N84°44′35″W / 39.3916667°N 84.7430556°W . [3]
The community was named for Charles Stewart, an early settler. [4]