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O'Fallon Post Office, Illinois O'Fallon Post Office is a post office located in St. Clair County, IL at N38.58197° W89.91175° (NAD83) and at an elevation of 561 ft MSL. It can be seen on the USGS 1:24K topographic map O'Fallon, IL.
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Note: Coordinates in the location and feature list above are referenced to NAD83 datum. |