| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| On-a-Slant Village historical | city | North Dakota | United States | 46.76694 | -100.84639 | 1699 | 13868 |
| Ona | city | Oregon | United States | 44.50417 | -124.02111 | 131 | 2137 |
| Ona | city | West Virginia | United States | 38.42472 | -82.21333 | 767 | 6251 |
| Ona | city | Florida | United States | 27.48167 | -81.91917 | 82 | 2186 |
| Ona historical | city | Arkansas | United States | 34.55194 | -91.54778 | 213 | 3316 |
| Onaga | city | Kansas | United States | 39.48889 | -96.16972 | 1095 | 354 |
| Onaka | city | South Dakota | United States | 45.19278 | -99.46583 | 1850 | 109 |
| Onalaska | city | Washington | United States | 46.57528 | -122.71694 | 600 | 1322 |
| Onalaska | city | Texas | United States | 30.80556 | -95.11611 | 147 | 3424 |
| Onalaska | city | Wisconsin | United States | 43.88444 | -91.235 | 679 | 24044 |
| Onalaska historical | city | Arkansas | United States | 33.67 | -92.74 | 127 | 1075 |
| Onamia | city | Minnesota | United States | 46.07056 | -93.6675 | 1249 | 605 |
| Onan | city | Virginia | United States | 37.98806 | -78.82444 | 803 | 2028 |
| Onancock | city | Virginia | United States | 37.71167 | -75.74944 | 19 | 4008 |
| Onapa | city | Oklahoma | United States | 35.40583 | -95.55306 | 666 | 1858 |
| Onarga | city | Illinois | United States | 40.715 | -88.00611 | 659 | 1664 |
| Onativia | city | New York | United States | 42.88944 | -76.08833 | 898 | 5087 |
| Onava | city | New Mexico | United States | 35.69667 | -105.09389 | 6706 | 131 |
| Onawa | city | Iowa | United States | 42.02667 | -96.09694 | 1046 | 3348 |
| Onawa | city | Maine | United States | 45.36667 | -69.37222 | 698 | 161 |
| Onawa Junction | city | Iowa | United States | 42.725 | -95.5575 | 1240 | 4870 |
| Onaway | city | Idaho | United States | 46.92833 | -116.89 | 2598 | 369 |
| Onaway | city | Michigan | United States | 45.3575 | -84.22389 | 885 | 864 |
| Onberg | city | Pennsylvania | United States | 40.66694 | -79.05528 | 1204 | 4156 |
| Onchiota | city | New York | United States | 44.49417 | -74.12389 | 1699 | 439 |
| Onda | city | Arkansas | United States | 35.86639 | -94.29167 | 1699 | 2316 |
| One Hundred One Pines subdivision | city | Washington | United States | 47.31306 | -122.04056 | 534 | 13034 |
| One Hundred Palms | city | California | United States | 33.56194 | -116.17167 | -52 | 2384 |
| One Hundred and One Ranch | city | Missouri | United States | 38.35056 | -90.66556 | 593 | 5778 |
| One Mile | city | Arizona | United States | 36.805 | -112.05361 | 6433 | 33 |
| One North Place | city | Louisiana | United States | 32.60694 | -93.84306 | 183 | 8069 |
| Oneco | city | Illinois | United States | 42.4875 | -89.66417 | 849 | 1488 |
| Oneco | city | Florida | United States | 27.44722 | -82.54639 | 22 | 113395 |
| Oneco | city | Connecticut | United States | 41.69361 | -71.80889 | 367 | 5378 |
| Onega | city | Minnesota | United States | 47.31861 | -92.82722 | 1299 | 615 |
| Onego | city | West Virginia | United States | 38.84778 | -79.42222 | 1899 | 411 |
| Oneida | city | Washington | United States | 46.31444 | -123.6775 | 101 | 377 |
| Oneida | city | Oklahoma | United States | 35.97083 | -98.06694 | 1095 | 322 |
| Oneida | city | Kansas | United States | 39.86389 | -95.93889 | 1223 | 918 |
| Oneida | city | Iowa | United States | 42.54278 | -91.35333 | 1033 | 1132 |
| Oneida | city | Louisiana | United States | 30.01917 | -90.79778 | 13 | 2105 |
| Oneida | city | Arkansas | United States | 34.46139 | -90.78306 | 164 | 884 |
| Oneida | city | Illinois | United States | 41.07222 | -90.22528 | 807 | 937 |
| Oneida | city | Wisconsin | United States | 44.49861 | -88.18278 | 662 | 5012 |
| Oneida | city | Tennessee | United States | 36.49806 | -84.51278 | 1476 | 2922 |
| Oneida | city | Ohio | United States | 39.47833 | -84.39028 | 705 | 58193 |
| Oneida | city | Kentucky | United States | 37.26944 | -83.64917 | 889 | 1548 |
| Oneida | city | Ohio | United States | 40.69861 | -81.14917 | 1092 | 7184 |
| Oneida | city | Pennsylvania | United States | 40.92167 | -79.88 | 1072 | 10396 |
| Oneida | city | Pennsylvania | United States | 40.9075 | -76.12583 | 1696 | 3660 |
| Oneida | city | New York | United States | 43.0925 | -75.65167 | 456 | 14325 |
| Oneida Castle | city | New York | United States | 43.0825 | -75.63389 | 475 | 14340 |
| Oneida Corners | city | New York | United States | 43.37528 | -73.62917 | 344 | 7605 |
| Oneida Lake Beach East | city | New York | United States | 43.16639 | -75.76472 | 377 | 5746 |
| Oneida Lake Beach West | city | New York | United States | 43.1575 | -75.84583 | 396 | 5193 |
| Oneida Subdivision | city | Tennessee | United States | 35.87222 | -85.08556 | 1860 | 2060 |
| Oneida Valley | city | New York | United States | 43.15444 | -75.72167 | 383 | 6414 |
| Oneill historical | city | Montana | United States | 46.14861 | -105.15 | 2598 | 14 |
| Onekama | city | Michigan | United States | 44.36361 | -86.205 | 587 | 1896 |
| Onekama Junction | city | Michigan | United States | 44.33694 | -86.2025 | 862 | 1896 |
| Onemo | city | Virginia | United States | 37.39556 | -76.27306 | 3 | 2264 |
| Onenoa | city | American Samoa | United States | -14.25667 | -170.57972 | 3 | 4690 |
| Oneoneloa | city | American Samoa | United States | -14.31278 | -170.69444 | 0 | 15543 |
| Oneonta | city | Alabama | United States | 33.94806 | -86.47278 | 885 | 3676 |
| Oneonta | city | Kentucky | United States | 38.975 | -84.30167 | 469 | 11893 |
| Oneonta | city | New York | United States | 42.45278 | -75.06417 | 1095 | 18009 |
| Oneonta historical | city | Kansas | United States | 39.65 | -97.88333 | 1423 | 247 |
| Oneota | city | Minnesota | United States | 46.74639 | -92.16583 | 656 | 38087 |
| Oneota historical | city | Nevada | United States | 37.93778 | -118.28889 | 7650 | 24 |
| Oneota historical | city | Nevada | United States | 38.025 | -115.34167 | 5003 | 4 |
| Oneta | city | Oklahoma | United States | 36.01889 | -95.70778 | 725 | 12618 |
| Ong | city | Kansas | United States | 40.39861 | -97.83556 | 1676 | 470 |
| Ong | city | New Jersey | United States | 39.91083 | -74.62111 | 98 | 9048 |
| Ongo | city | Missouri | United States | 36.99056 | -92.89389 | 1315 | 1124 |
| Onia | city | Arkansas | United States | 35.91889 | -92.32694 | 843 | 567 |
| Onida | city | South Dakota | United States | 44.70806 | -100.05944 | 1899 | 61 |
| Onie historical | city | West Virginia | United States | 39.61972 | -80.63111 | 1397 | 1204 |
| Onigum | city | Minnesota | United States | 47.10944 | -94.54444 | 1299 | 779 |
| Onion Creek | city | Washington | United States | 48.78389 | -117.81056 | 2591 | 465 |
| Onion Creek | city | Texas | United States | 30.13639 | -97.78389 | 600 | 54104 |
| Onion Creek | city | Texas | United States | 32.22417 | -96.62139 | 377 | 2704 |
| Onion Spring | city | Texas | United States | 29.4 | -103.33333 | 3405 | 28 |
| Oniontown | city | Pennsylvania | United States | 41.34667 | -80.34056 | 1115 | 9969 |
| Oniontown | city | New York | United States | 43.11722 | -75.83028 | 380 | 8246 |
| Oniontown | city | New York | United States | 41.72278 | -73.58444 | 396 | 5441 |
| Onks | city | Tennessee | United States | 36.29861 | -82.44222 | 1797 | 25283 |
| Onley | city | Virginia | United States | 37.69083 | -75.71639 | 42 | 3749 |
| Only | city | Missouri | United States | 37.91667 | -92.95028 | 1085 | 965 |
| Only | city | Tennessee | United States | 35.86167 | -87.69167 | 597 | 673 |
| Onnalinda | city | Pennsylvania | United States | 40.30944 | -78.68028 | 2385 | 5854 |
| Ono | city | California | United States | 40.47528 | -122.61694 | 918 | 285 |
| Ono | city | Wisconsin | United States | 44.65556 | -92.25611 | 1148 | 924 |
| Ono | city | Kentucky | United States | 36.98861 | -84.96667 | 902 | 1946 |
| Ono | city | Pennsylvania | United States | 40.40278 | -76.535 | 429 | 9104 |
| Onomea historical | city | Hawaii | United States | 19.81667 | -155.10361 | 226 | 1953 |
| Onondaga | city | Michigan | United States | 42.44417 | -84.56222 | 898 | 2987 |
| Onondaga Castle | city | New York | United States | 42.97056 | -76.14139 | 590 | 78697 |
| Onondaga Hill | city | New York | United States | 43.00472 | -76.18361 | 833 | 128255 |
| Onota | city | Michigan | United States | 46.47111 | -86.99583 | 1000 | 519 |
| Onoto | city | West Virginia | United States | 38.27111 | -80.10694 | 2424 | 484 |
| Onoville | city | New York | United States | 42.02694 | -78.96556 | 1433 | 2241 |
| Onset | city | Massachusetts | United States | 41.74167 | -70.65833 | 0 | 17182 |
| Onset Station | city | Massachusetts | United States | 41.75611 | -70.6775 | 9 | 15780 |
| Onslow | city | Washington | United States | 47.17056 | -124.11306 | 85 | 1444 |
| Onslow | city | Iowa | United States | 42.10694 | -91.015 | 872 | 876 |
| Onslow Gardens subdivision | city | North Carolina | United States | 34.77917 | -77.42389 | 29 | 41337 |
| Onspaugh Corners | city | Pennsylvania | United States | 41.64722 | -80.20889 | 1171 | 7183 |
| Onsted | city | Michigan | United States | 42.00611 | -84.19 | 987 | 3928 |
| Ontario | city | California | United States | 34.06333 | -117.65 | 990 | 237596 |
| Ontario | city | Oregon | United States | 44.02667 | -116.96194 | 2106 | 12218 |
| Ontario | city | Kansas | United States | 39.56667 | -95.88194 | 1164 | 375 |
| Ontario | city | Oklahoma | United States | 36.9875 | -94.76278 | 839 | 4698 |
| Ontario | city | Iowa | United States | 42.03583 | -93.68139 | 997 | 32929 |
| Ontario | city | Wisconsin | United States | 43.72583 | -90.59139 | 882 | 1081 |
| Ontario | city | Illinois | United States | 41.07861 | -90.3075 | 797 | 1540 |
| Ontario | city | Indiana | United States | 41.70222 | -85.3825 | 895 | 4266 |
| Ontario | city | Ohio | United States | 40.75944 | -82.59028 | 1377 | 20068 |
| Ontario | city | Pennsylvania | United States | 40.10333 | -80.07472 | 1095 | 7048 |
| Ontario | city | Virginia | United States | 36.98833 | -78.48639 | 600 | 1188 |
| Ontario | city | New York | United States | 43.22083 | -77.28333 | 459 | 9379 |
| Ontario Beach | city | New York | United States | 43.26 | -77.61139 | 262 | 48053 |
| Ontario Center | city | New York | United States | 43.22583 | -77.30611 | 439 | 10028 |
| Ontario Heights | city | Oregon | United States | 44.07056 | -117.0225 | 2237 | 6666 |
| Ontario on the Lake | city | New York | United States | 43.27806 | -77.34861 | 298 | 9655 |
| Ontario subdivision | city | Utah | United States | 40.74722 | -111.90056 | 4284 | 188046 |
| Ontarioville | city | Illinois | United States | 41.9875 | -88.15 | 800 | 141863 |
| Ontelaunee | city | Pennsylvania | United States | 40.41694 | -75.94472 | 298 | 21765 |
| Onteo Beach | city | New York | United States | 43.35639 | -77.91056 | 246 | 4674 |
| Onteora Park | city | New York | United States | 42.22 | -74.13583 | 2198 | 971 |
| Onton | city | Kentucky | United States | 37.555 | -87.43694 | 426 | 1457 |
| Ontonagon | city | Michigan | United States | 46.87111 | -89.31389 | 613 | 489 |
| Onvil | city | North Carolina | United States | 35.28056 | -79.86722 | 498 | 1892 |
| Onville historical | city | Virginia | United States | 38.49111 | -77.445 | 147 | 24258 |
| Onward | city | Mississippi | United States | 32.72528 | -90.94194 | 98 | 437 |
| Onward | city | Indiana | United States | 40.69472 | -86.195 | 770 | 5236 |
| Onway Lake | city | New Hampshire | United States | 43.03417 | -71.21667 | 265 | 9214 |
| Onycha | city | Alabama | United States | 31.21389 | -86.28333 | 337 | 4304 |
| Onyx | city | California | United States | 35.69028 | -118.21972 | 2821 | 361 |
| Onyx | city | Arkansas | United States | 34.85139 | -93.40778 | 702 | 322 |
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