| Name | Population | Altitude | Latitude | Longitude | 
Obonai : | 
 | 245 m | 39°42'0.0" N | 140°43'1.2" E | 
Ochiai : | 
 | 169 m | 39°17'60.0" N | 140°37'58.8" E | 
Oda : | 
 | 100 m | 39°21'0.0" N | 140°22'58.8" E | 
Odate (Odate) : | 64 543 | 60 m | 40°16'7.0" N | 140°34'4.8" E | 
Ogida : | 
 | 61 m | 40°13'18.8" N | 140°35'6.0" E | 
Ogita : | 
 | 61 m | 40°13'18.8" N | 140°35'6.0" E | 
Oide : | 
 | 400 m | 40°24'33.1" N | 140°51'14.4" E | 
Oikata : | 
 | 125 m | 39°17'60.0" N | 140°16'58.8" E | 
Oiwake : | 
 | 10 m | 39°47'60.0" N | 140°3'0.0" E | 
Okawamachi : | 
 | 13 m | 39°40'59.9" N | 140°5'60.0" E | 
Okubomachi : | 
 | 18 m | 39°52'0.1" N | 140°3'0.0" E | 
Okubo : | 
 | 18 m | 39°52'0.1" N | 140°3'0.0" E | 
Okuzo : | 
 | 300 m | 40°7'0.1" N | 140°40'1.2" E | 
Okuzu : | 
 | 300 m | 40°7'0.1" N | 140°40'1.2" E | 
Omagari (Omagari) : | 38 805 | 30 m | 39°27'0.0" N | 140°28'58.8" E | 
Omori : | 
 | 48 m | 39°21'0.0" N | 140°25'58.8" E | 
Onnagawa : | 
 | 16 m | 39°52'0.1" N | 139°49'1.2" E | 
Osarizawakozan : | 
 | 286 m | 40°10'59.9" N | 140°45'0.0" E | 
Osarizawa : | 
 | 286 m | 40°10'59.9" N | 140°45'0.0" E | 
Osawagoshuku : | 
 | 96 m | 39°31'0.1" N | 140°18'0.0" E | 
Osawa : | 
 | 100 m | 39°16'0.1" N | 140°22'58.8" E | 
Ota : | 
 | 100 m | 39°21'0.0" N | 140°22'58.8" E | 
Otate : | 
 | 140 m | 39°8'60.0" N | 140°34'1.2" E | 
Oyachi : | 
 | 1 m | 40°4'0.1" N | 139°58'1.2" E | 
Oyaji : | 
 | 1 m | 40°4'0.1" N | 139°58'1.2" E | 
Oyanagi : | 
 | 416 m | 39°4'59.9" N | 140°43'1.2" E | 
Oyasu : | 
 | 275 m | 39°1'59.9" N | 140°39'0.0" E | 
Oyu : | 
 | 200 m | 40°17'17.2" N | 140°49'33.6" E | 
Ozarizawa : | 
 | 286 m | 40°10'59.9" N | 140°45'0.0" E | 
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