Click here to view US cities and towns arranged by State
Alphabetical Listing of US Cities and Towns
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| City/Town | State |
| O'Fallon | Illinois |
| O'Fallon | Missouri |
| O'Hara Township | Pennsylvania |
| Oak Brook | Illinois |
| Oak Creek | Wisconsin |
| Oak Forest | Illinois |
| Oak Grove | Kentucky |
| Oak Grove | South Carolina |
| Oak Grove | Oregon |
| Oak Grove | Minnesota |
| Oak Harbor | Washington |
| Oak Hill | West Virginia |
| Oak Hills | Oregon |
| Oak Hills Place | Louisiana |
| Oak Island | North Carolina |
| Oak Lawn | Illinois |
| Oak Park | Illinois |
| Oak Park | Michigan |
| Oak Ridge | Tennessee |
| Oak Ridge | Florida |
| Oakbrook | Kentucky |
| Oakdale | Louisiana |
| Oakdale | California |
| Oakdale | Minnesota |
| Oakdale | New York |
| Oakland | New Jersey |
| Oakland | California |
| Oakland Park | Florida |
| Oakley | California |
| Oakmont | Pennsylvania |
| Oakton | Virginia |
| Oakville | Missouri |
| Oakville | Connecticut |
| Oakwood | Ohio |
| Oatfield | Oregon |
| Oberlin | Ohio |
| Ocala | Florida |
| Ocean Acres | New Jersey |
| Ocean City | New Jersey |
| Ocean City | Maryland |
| Ocean Pines | Maryland |
| Ocean Springs | Mississippi |
| Oceano | California |
| Oceanside | California |
| Oceanside | New York |
| Ocoee | Florida |
| Oconomowoc | Wisconsin |
| Oconomowoc | Wisconsin |
| Odenton | Maryland |
| Odessa | Texas |
| Oelwein | Iowa |
| Offutt AFB | Nebraska |
| Ogden | New York |
| Ogden | Utah |
| Ogdensburg | New York |
| Oil City | Pennsylvania |
| Oildale | California |
| Ojai | California |
| Ojus | Florida |
| Okemos | Michigan |
| Oklahoma City | Oklahoma |
| Okmulgee | Oklahoma |
| Okolona | Kentucky |
| Olathe | Kansas |
| Old Bridge | New Jersey |
| Old Forge | Pennsylvania |
| Old Lyme | Connecticut |
| Old Orchard Beach | Maine |
| Old Orchard Beach | Maine |
| Old Saybrook | Connecticut |
| Old Town | Maine |
| Oldsmar | Florida |
| Olean | New York |
| Olive Branch | Mississippi |
| Olivehurst | California |
| Olivette | Missouri |
| Olmsted Falls | Ohio |
| Olney | Maryland |
| Olney | Illinois |
| Olympia | Washington |
| Olympia Heights | Florida |
| Omaha | Nebraska |
| Onalaska | Wisconsin |
| Oneida | New York |
| Oneonta | New York |
| Onondaga | New York |
| Ontario | New York |
| Ontario | Oregon |
| Ontario | California |
| Opa-locka | Florida |
| Opa-locka North | Florida |
| Opal Cliffs | California |
| Opelika | Alabama |
| Opelousas | Louisiana |
| Opp | Alabama |
| Opportunity | Washington |
| Oquirrh | Utah |
| Oradell | New Jersey |
| Orange | New Jersey |
| Orange | Massachusetts |
| Orange | Texas |
| Orange | Connecticut |
| Orange | California |
| Orange | Connecticut |
| Orange City | Florida |
| Orange Cove | California |
| Orange Lake | New York |
| Orange Park | Florida |
| Orangeburg | South Carolina |
| Orangetown | New York |
| Orangevale | California |
| Orchard Mesa | Colorado |
| Orchard Park | New York |
| Orchards | Washington |
| Orcutt | California |
| Oregon | Ohio |
| Oregon | Wisconsin |
| Oregon City | Oregon |
| Orem | Utah |
| Orinda | California |
| Orland | California |
| Orland Hills | Illinois |
| Orland Park | Illinois |
| Orlando | Florida |
| Orleans | Massachusetts |
| Orlovista | Florida |
| Ormond Beach | Florida |
| Ormond-By-The-Sea | Florida |
| Oro Valley | Arizona |
| Orono | Maine |
| Orono | Maine |
| Orono | Minnesota |
| Orosi | California |
| Oroville | California |
| Oroville East | California |
| Orrville | Ohio |
| Osceola | Arkansas |
| Oshkosh | Wisconsin |
| Oskaloosa | Iowa |
| Ossining | New York |
| Ossining | New York |
| Oswego | New York |
| Oswego | New York |
| Oswego | Illinois |
| Otis Orchards-East Farms | Washington |
| Otsego | Minnesota |
| Ottawa | Illinois |
| Ottawa | Kansas |
| Ottumwa | Iowa |
| Overland | Missouri |
| Overland Park | Kansas |
| Overlea | Maryland |
| Oviedo | Florida |
| Owasso | Oklahoma |
| Owatonna | Minnesota |
| Owego | New York |
| Owensboro | Kentucky |
| Owings Mills | Maryland |
| Owosso | Michigan |
| Oxford | Massachusetts |
| Oxford | Mississippi |
| Oxford | North Carolina |
| Oxford | Ohio |
| Oxford | Connecticut |
| Oxford | Alabama |
| Oxnard | California |
| Oxon Hill-Glassmanor | Maryland |
| Oyster Bay | New York |
| Oyster Bay | New York |
| Ozark | Missouri |
| Ozark | Alabama |
