Flag Spring (also called Flag Springs) is an unincorporated community in northeastern Phelps County, in the U.S. state of Missouri.[1]
The community is located on Missouri Route B, approximately one mile north of St. James and Interstate 44.[2]
The community once contained a schoolhouse called Flag Spring School.[3] The area most likely took its name from a nearby spring noted for the flag irises along its course.[4] A cemetery marks the site.[5]