| Zipcode | Community | City | State | Metro Area |
|---|---|---|---|---|
| 14766 | Otto | Otto | New York | Olean NY |
| 17821 | Ottawa | Danville | Pennsylvania | Bloomsburg-Berwick PA |
| 17963 | Outwood | Pine grove | Pennsylvania | Pottsville PA |
| 25149 | Ottawa | Ottawa | West Virginia | Charleston WV |
| 25902 | Odd | Odd | West Virginia | Beckley WV |
| 28763 | Otto | Otto | North Carolina | |
| 39464 | Ouetti | Ovett | Mississippi | Laurel MS |
| 45657 | Otway | Otway | Ohio | Portsmouth OH |
| 50569 | Otho | Otho | Iowa | Fort Dodge IA |
| 51044 | Oto | Oto | Iowa | Sioux City IA-NE-SD |
| 61350 | Ottawa | Ottawa | Illinois | Ottawa-Peru IL |
| 63052 | Otto | Imperial | Missouri | St. Louis MO-IL |
| 66067 | Ottawa | Ottawa | Kansas | Ottawa KS |
| 68417 | Otoe | Otoe | Nebraska | |
| 72173 | Otto | Vilonia | Arkansas | Little Rock-North Little Rock-Conway AR |
| 76682 | Otto | Riesel | Texas | Waco TX |
| 82434 | Otto | Otto | Wyoming | |
| 98550 | Oyhat | Hoquiam | Washington | Aberdeen WA |
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