Old Post Office ist der Name folgender im NRHP gelisteten Objekte:
Old Post Office (Garland County, Arkansas), ID-Nr. 90000547 Old Post Office (Polk County, Arkansas), ID-Nr. 91000686 Old Post Office (Washington County, Arkansas), ID-Nr. 74000503 Old Post Office (Iowa), ID-Nr. 79000905 Old Post Office (Kalifornien), ID-Nr. 79000559 Old Post Office (Louisiana), ID-Nr. 80001718 Old Post Office (Kennebec County, Maine), ID-Nr. 74000172 Old Post Office (Waldo County, Maine), ID-Nr. 73000149 Old Post Office (Maine), ID-Nr. 74000172 Old Post Office (Massachusetts), ID-Nr. 82005270 Old Post Office (New Hampshire), ID-Nr. 73000269 Old Post Office (New Mexico), ID-Nr. 80002544 Old Post Office (Albany County, New York), ID-Nr. 72000814 Old Post Office (Otsego County, New York), ID-Nr. 78001895 Old Post Office (Tennessee), ID-Nr. 73001777
Siehe auch: Old Post Office Pavilion in Washington, D.C., ID-Nr. 73002105 Old Post Office Building Old Federal Building and Post Office Old US Post Office