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City of O Fallon
Directory area code 636 and prefix 251 available at City of O Fallon
Directory Numbers
+1 (636) 251-XXXX
Here are the components:
Country Code: +1 (both the USA and Canada share the same country code).
Area Code: A 3-digit code that designates a specific geographic area or region.
Prefix: A 3-digit code that narrows the location within the area covered by the area code.
Line Number: A 4-digit number unique to the individual or business within that prefix.