| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Old Oak Trails Estates Mobile Home Park | city | Michigan | United States | 43.66 | -84.32 | 830 | |
| Old Oaken Bucket Homestead | city | Massachusetts | United States | 42.18 | -70.76 | 45 | |
| Old Oaks | city | Virginia | United States | 37.63 | -77.79 | 219 | |
| Old Oaks | city | Illinois | United States | 41.57 | -88.18 | 830 | |
| Old Oaks Estates | city | Illinois | United States | 41.64 | -87.94 | 830 | |
| Old Ocean | city | Texas | United States | 29.08 | -95.75 | 32 | |
| Old Olga | city | Kentucky | United States | 36.93 | -85.17 | 941 | |
| Old Orchard | city | South Carolina | United States | 32.72 | -79.94 | 3 | |
| Old Orchard | city | Virginia | United States | 37.11 | -76.54 | 3 | |
| Old Orchard | city | Pennsylvania | United States | 40.66 | -75.26 | 200 | |
| Old Orchard Beach | city | Maine | United States | 43.52 | -70.38 | 0 | |
| Old Orchard Cove | city | New York | United States | 42.80 | -77.70 | 984 | |
| Old Orchard Estates | city | Maryland | United States | 39.30 | -77.31 | 830 | |
| Old Orchard Mobile Home Park | city | Iowa | United States | 42.01 | -93.63 | 902 | |
| Old Orchard Point | city | New York | United States | 42.79 | -77.71 | 853 | |
| Old Orchard Trailer Park | city | New York | United States | 41.57 | -74.20 | 360 | |
| Old Orchid | city | South Carolina | United States | 35.00 | -80.96 | 830 | |
| Old Ornbaun Hot Springs | city | California | United States | 38.91 | -123.31 | 1669 | |
| Old Oscar Nance Place | city | Texas | United States | 30.48 | -103.19 | 5029 | |
| Old Overton (historical) | city | Nevada | United States | 36.56 | -114.44 | 1669 |