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