| Zipcode | Community | City | State | Metro Area |
|---|---|---|---|---|
| 06360 | Occum | Norwich | Connecticut | Norwich-New London CT |
| 07712 | Ocean | Asbury park | New Jersey | New York-Newark-Jersey City NY-NJ-PA |
| 17739 | Okome | Jersey mills | Pennsylvania | Williamsport PA |
| 27371 | Okeewemee | Troy | North Carolina | |
| 30732 | Oakman | Oakman | Georgia | Calhoun GA |
| 31067 | Oconee | Oconee | Georgia | |
| 34660 | Ozona | Ozona | Florida | Tampa-St. Petersburg-Clearwater FL |
| 35579 | Oakman | Oakman | Alabama | Birmingham-Hoover AL |
| 37854 | Ozone | Rockwood | Tennessee | Knoxville TN |
| 39426 | Ozona | Carriere | Mississippi | Picayune MS |
| 45053 | Okeana | Okeana | Ohio | Cincinnati OH-KY-IN |
| 46777 | Ossian | Ossian | Indiana | Fort Wayne IN |
| 52161 | Ossian | Ossian | Iowa | |
| 54459 | Ogema | Ogema | Wisconsin | |
| 56569 | Ogema | Ogema | Minnesota | |
| 57365 | Oacoma | Oacoma | South Dakota | |
| 62553 | Oconee | Oconee | Illinois | |
| 71855 | Ozan | Ozan | Arkansas | |
| 72449 | O kean | O kean | Arkansas | |
| 72854 | Ozone | Ozone | Arkansas | |
| 73763 | Okeene | Okeene | Oklahoma | |
| 78945 | Oquinn | La grange | Texas | |
| 93445 | Oceano | Oceano | California | San Luis Obispo-Paso Robles-Arroyo Grand |
| 93475 | Oceano | Oceano | California | San Luis Obispo-Paso Robles-Arroyo Grand |