| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Oma | city | Arkansas | United States | 34.40 | -93.26 | 830 | |
| Oma | city | Mississippi | United States | 31.73 | -90.14 | 200 | |
| Omaha | city | Arkansas | United States | 36.45 | -93.19 | 1197 | |
| Omaha | city | Alabama | United States | 33.30 | -85.31 | 1174 | |
| Omaha | city | Georgia | United States | 32.15 | -85.01 | 298 | |
| Omaha | city | Illinois | United States | 37.89 | -88.30 | 360 | |
| Omaha | city | Kentucky | United States | 37.28 | -82.84 | 1669 | |
| Omaha | city | Missouri | United States | 40.53 | -92.80 | 954 | |
| Omaha | city | Nebraska | United States | 41.26 | -95.94 | 1059 | |
| Omaha | city | Texas | United States | 33.18 | -94.74 | 400 | |
| Omaha | city | Virginia | United States | 37.10 | -82.43 | 2509 | |
| Omaha Heights | city | California | United States | 34.08 | -118.19 | 830 | |
| Omaha Regency | city | Nebraska | United States | 41.27 | -96.19 | 1105 | |
| Omaha Springs | city | Georgia | United States | 33.17 | -82.54 | 400 | |
| Omak | city | Washington | United States | 48.41 | -119.53 | 872 | |
| Omans | city | Washington | United States | 47.60 | -118.08 | 2509 | |
| Omar | city | Delaware | United States | 38.53 | -75.20 | 19 | |
| Omar | city | Illinois | United States | 37.50 | -88.97 | 830 | |
| Omar | city | New York | United States | 44.26 | -75.97 | 298 | |
| Omar | city | Ohio | United States | 41.12 | -82.87 | 898 | |
| Omar | city | West Virginia | United States | 37.76 | -82.00 | 931 | |
| Omar | city | Florida | United States | 27.92 | -82.53 | 6 | |
| Omar (historical) | city | Maryland | United States | 39.06 | -76.60 | 49 | |
| Omar Acres | city | Maryland | United States | 39.54 | -77.02 | 830 | |
| Omas Pine Mobile Home Park | city | Mississippi | United States | 30.43 | -88.74 | 22 | |
| Omba (historical) | city | Missouri | United States | 36.87 | -92.16 | 935 | |
| Omco | city | Nevada | United States | 38.61 | -117.89 | 6171 | |
| Omega | city | Arkansas | United States | 33.82 | -91.48 | 154 | |
| Omega | city | Alabama | United States | 31.98 | -85.78 | 396 | |
| Omega | city | Colorado | United States | 40.54 | -105.08 | 5029 | |
| Omega | city | Georgia | United States | 31.34 | -83.59 | 334 | |
| Omega | city | Idaho | United States | 47.33 | -116.48 | 2775 | |
| Omega | city | Illinois | United States | 38.70 | -88.78 | 830 | |
| Omega | city | Indiana | United States | 40.20 | -85.94 | 846 | |
| Omega | city | Kentucky | United States | 36.95 | -84.51 | 875 | |
| Omega | city | Louisiana | United States | 32.52 | -91.14 | 82 | |
| Omega | city | Louisiana | United States | 31.57 | -91.80 | 49 | |
| Omega | city | Mississippi | United States | 33.12 | -90.31 | 101 | |
| Omega | city | New Mexico | United States | 34.32 | -108.37 | 7549 | |
| Omega | city | Ohio | United States | 39.15 | -82.91 | 830 | |
| Omega | city | Oklahoma | United States | 35.87 | -98.20 | 1200 | |
| Omega | city | Virginia | United States | 36.67 | -78.81 | 830 | |
| Omega | city | California | United States | 39.33 | -120.75 | 4471 | |
| Omega (historical) | city | Tennessee | United States | 36.24 | -87.54 | 830 | |
| Omega (historical) | city | Rhode Island | United States | 41.84 | -71.36 | 19 | |
| Omemee | city | North Dakota | United States | 48.71 | -100.36 | 1669 | |
| Omen | city | Texas | United States | 32.22 | -95.10 | 830 | |
| Omena | city | Michigan | United States | 45.06 | -85.59 | 830 | |
| Omer | city | Michigan | United States | 44.05 | -83.85 | 830 | |
| Omi | city | New York | United States | 42.33 | -73.68 | 298 | |
| Omill | city | Idaho | United States | 46.49 | -115.93 | 3349 | |
| Omira | city | California | United States | 39.97 | -120.08 | 4389 | |
| Omlee | city | New Mexico | United States | 32.84 | -105.97 | 4189 | |
| Omni | city | Alabama | United States | 31.32 | -85.81 | 262 | |
| Omo (historical) | city | Louisiana | United States | 30.81 | -92.26 | 45 | |
| Omo Ranch | city | California | United States | 38.58 | -120.57 | 3599 | |
| Omro | city | New York | United States | 42.78 | -76.43 | 1669 | |
| Omro | city | Wisconsin | United States | 44.04 | -88.74 | 830 | |
| Omus | city | California | United States | 38.72 | -122.92 | 232 |