Name | Population | Altitude | Latitude | Longitude |
Oacoma (Oacoma) : | 403 | 413 m | 43°47'46.0" N | 99°23'43.1" W |
Oahe : |
| 494 m | 44°27'28.1" N | 100°31'51.6" W |
Oak Hills Addition : |
| 374 m | 42°52'0.1" N | 97°31'57.0" W |
Oak Park Estates : |
| 457 m | 43°43'50.2" N | 96°29'30.1" W |
Oelrichs (Oelrichs) : | 143 | 1 036 m | 43°10'44.0" N | 103°13'48.0" W |
Oglala (Oglala) : | 1 637 | 923 m | 43°11'19.0" N | 102°44'20.4" W |
Okaton (Okaton) : | 30 | 701 m | 43°53'10.0" N | 100°53'27.6" W |
Okobojo : |
|
| 44°38'57.1" N | 100°23'42.0" W |
Okreek : |
| 701 m | 43°21'43.9" N | 100°23'9.6" W |
Ola : |
| 533 m | 43°36'2.9" N | 99°12'37.1" W |
Oldham (Oldham) : | 180 | 529 m | 44°13'39.0" N | 97°18'27.0" W |
Olivet (Olivet) : | 64 | 372 m | 43°14'26.9" N | 97°40'30.0" W |
Olsonville : |
| 853 m | 43°7'40.1" N | 100°36'32.4" W |
Onaka (Onaka) : | 28 | 564 m | 45°11'34.1" N | 99°27'56.9" W |
Onida (Onida) : | 657 | 579 m | 44°42'29.2" N | 100°3'32.4" W |
Opal : |
| 807 m | 44°53'30.1" N | 102°27'0.0" W |
Oral : |
| 914 m | 43°24'18.0" N | 103°16'8.4" W |
Ordway : |
| 399 m | 45°34'43.0" N | 98°24'42.1" W |
Oreville : |
| 1 644 m | 43°52'3.0" N | 103°37'19.2" W |
Orient (Orient) : | 51 | 485 m | 44°54'1.1" N | 99°5'20.0" W |
Orland : |
| 547 m | 43°53'30.1" N | 97°11'20.0" W |
Ortley (Ortley) : | 54 | 564 m | 45°19'55.9" N | 97°11'43.1" W |
Orton : |
| 610 m | 44°42'37.1" N | 100°50'31.2" W |
Osceola : |
| 437 m | 44°28'3.0" N | 97°50'17.9" W |
Ottumwa : |
| 676 m | 44°14'1.0" N | 101°20'49.2" W |
Owanka : |
| 772 m | 44°1'19.9" N | 102°35'13.2" W |
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