United States Cities Starting with O
Cities in the United States with population greater than 10,000 starting with the letter O.
| City | 2020 Population | State |
|---|
| Oklahoma City | 655,407 | Oklahoma |
| Omaha | 470,702 | Nebraska |
| Oakland | 435,224 | California |
| Orlando | 291,739 | Florida |
| Oxnard | 212,715 | California |
| Overland Park | 196,636 | Kansas |
| Ontario | 186,653 | California |
| Oceanside | 176,950 | California |
| Olathe | 142,841 | Kansas |
| Orange | 138,816 | California |
| Odessa | 119,738 | Texas |
| Orem | 99,045 | Utah |
| O'Fallon | 90,684 | Missouri |
| Ogden | 88,061 | Utah |
| Oshkosh | 66,831 | Wisconsin |
| Ocala | 61,719 | Florida |
| Owensboro | 60,323 | Kentucky |
| Orland Park | 57,634 | Illinois |
| Oak Lawn | 54,555 | Illinois |
| Olympia | 54,427 | Washington |
| Oak Park | 52,443 | Illinois |
| Ocoee | 50,394 | Florida |
| Oro Valley | 46,933 | Arizona |
| Oakland Park | 46,771 | Florida |
| Ormond Beach | 44,985 | Florida |
| Oviedo | 44,395 | Florida |
| Oakley | 43,991 | California |
| Odenton | 41,846 | Maryland |
| Olive Branch | 39,837 | Mississippi |
| Oregon City | 37,839 | Oregon |
| Oakton | 37,185 | Virginia |
| Owasso | 37,116 | Oklahoma |
| Oak Creek | 37,006 | Wisconsin |
| Oakville | 36,827 | Missouri |
| Oswego | 36,013 | Illinois |
| Olney | 35,280 | Maryland |
| Orangevale | 34,757 | California |
| Oildale | 34,723 | California |
| Owings Mills | 34,477 | Maryland |
| Opelika | 31,455 | Alabama |
| Oceanside | 31,185 | New York |
| Orcutt | 30,493 | California |
| O'Fallon | 29,918 | Illinois |
| Oak Park | 29,450 | Michigan |
| Oak Ridge | 29,363 | Tennessee |
| Oakdale | 28,088 | Minnesota |
| Oakleaf Plantation | 27,252 | Florida |
| Oak Forest | 26,920 | Illinois |
| Owatonna | 25,950 | Minnesota |
| Oxford | 25,884 | Mississippi |
| Ossining | 24,722 | New York |
| Oakdale | 24,385 | California |
| Ottumwa | 24,148 | Iowa |
| Oak Harbor | 24,067 | Washington |
| Okemos | 23,912 | Michigan |
| Oxford | 23,859 | Ohio |
| Oak Ridge | 23,712 | Florida |
| Old Bridge | 23,607 | New Jersey |
| Orchards | 23,020 | Washington |
| Ozark | 21,338 | Missouri |
| Oxford | 21,117 | Alabama |
| Orinda | 20,152 | California |
| Oregon | 19,822 | Ohio |
| Oroville | 19,456 | California |
| Old Jamestown | 19,439 | Missouri |
| Onalaska | 18,827 | Wisconsin |
| Otsego | 18,581 | Minnesota |
| Orange | 18,336 | Texas |
| Ocean Springs | 18,099 | Mississippi |
| Ottawa | 17,996 | Illinois |
| Oxon Hill | 17,720 | Maryland |
| Ojus | 17,462 | Florida |
| Oconomowoc | 17,195 | Wisconsin |
| Oak Grove | 17,183 | Oregon |
| Oswego | 17,103 | New York |
| Ocean Acres | 16,803 | New Jersey |
| Opa-locka | 16,304 | Florida |
| Opelousas | 15,876 | Louisiana |
| Overland | 15,461 | Missouri |
| Oldsmar | 15,201 | Florida |
| Olympia Heights | 14,536 | Florida |
| Owosso | 14,380 | Michigan |
| Ozark | 14,197 | Alabama |
| Oneonta | 14,158 | New York |
| Ocean Pointe | 14,037 | Hawaii |
| Orange | 13,937 | Connecticut |
| Oak Park | 13,730 | California |
| Oatfield | 13,531 | Oregon |
| Olean | 13,395 | New York |
| Olivehurst | 13,309 | California |
| Oakland | 13,081 | New Jersey |
| Orangeburg | 12,749 | South Carolina |
| Overlea | 12,384 | Maryland |
| Ottawa | 12,337 | Kansas |
| Ocean Pines | 12,246 | Maryland |
| Orange City | 12,156 | Florida |
| Oak Hills | 11,962 | Oregon |
| Okmulgee | 11,587 | Oklahoma |
| Oskaloosa | 11,490 | Iowa |
| Ontario | 11,108 | Oregon |
| Oak Grove | 10,993 | South Carolina |
| Ocean City | 10,873 | New Jersey |
| Oregon | 10,820 | Wisconsin |
| Oneida | 10,684 | New York |
| Ogdensburg | 10,323 | New York |