Length: 188 mi. Missouri Route 21 (MO 21) is a highway in the eastern part of Missouri, that begins at the Arkansas state line (Highway 115), and ends in Affton. The road goes through the counties of Ripley, Carter, Reynolds, Iron, Washington, Jefferson, and St. Louis. It was inaugurated in 1922.
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Missouri Route 21
Location:
Missouri
Type:
Information sign