| Name | Population | Altitude | Latitude | Longitude | 
Oak Acres : | 
 | 236 m | 39°13'19.9" N | 81°40'54.1" W | 
Oak Drive Subdivision : | 
 | 246 m | 38°49'5.9" N | 81°21'50.0" W | 
Oak Flat : | 
 | 472 m | 38°39'33.8" N | 79°12'47.2" W | 
Oak Grove : | 
 | 779 m | 37°23'13.9" N | 81°3'49.0" W | 
Oak Hill (Oak Hill) : | 7 589 | 576 m | 37°58'19.9" N | 81°8'56.0" W | 
Oak Hill Junction : | 
 | 579 m | 37°58'55.9" N | 81°10'27.8" W | 
Oak Ridge : | 
 | 518 m | 38°4'30.0" N | 81°6'34.9" W | 
Oakbrook : | 
 | 205 m | 39°10'50.2" N | 81°31'14.9" W | 
Oakdale : | 
 | 365 m | 39°26'57.1" N | 80°23'46.0" W | 
Oakland : | 
 | 210 m | 38°10'23.2" N | 81°18'16.9" W | 
Oakmont : | 
 | 637 m | 39°22'0.1" N | 79°11'19.0" W | 
Oakmont Hills : | 
 | 337 m | 40°4'3.0" N | 80°40'19.9" W | 
Oakton : | 
 | 257 m | 38°29'16.1" N | 81°2'51.0" W | 
Oakvale (Oakvale) : | 137 | 547 m | 37°20'3.1" N | 80°57'46.1" W | 
Oakview : | 
 | 280 m | 39°40'0.1" N | 79°58'14.2" W | 
Oakview Heights : | 
 | 200 m | 38°23'28.0" N | 82°34'58.1" W | 
Oakwood : | 
 | 296 m | 38°20'31.9" N | 81°39'50.0" W | 
Oakwood Estates : | 
 | 238 m | 38°27'6.8" N | 81°55'18.8" W | 
Oceana (Oceana) : | 1 472 | 399 m | 37°41'30.8" N | 81°37'27.1" W | 
Odaville : | 
 | 243 m | 38°55'57.0" N | 81°38'26.9" W | 
Odd : | 
 | 822 m | 37°35'35.9" N | 81°11'39.1" W | 
Odell : | 
 | 305 m | 38°23'25.1" N | 81°21'56.2" W | 
Odell Town : | 
 | 792 m | 38°11'52.1" N | 80°42'49.0" W | 
Odessa : | 
 | 303 m | 38°25'43.0" N | 81°14'17.2" W | 
Ogden : | 
 | 508 m | 37°58'36.8" N | 81°7'45.1" W | 
Ohley : | 
 | 279 m | 38°6'24.8" N | 81°26'57.1" W | 
Oil Spring : | 
 | 304 m | 39°13'19.9" N | 81°17'19.0" W | 
Oilville : | 
 | 335 m | 37°43'40.1" N | 82°2'13.9" W | 
Oka : | 
 | 274 m | 38°39'22.0" N | 81°8'12.1" W | 
Okonoko : | 
 | 213 m | 39°31'23.2" N | 78°31'32.2" W | 
Olcott : | 
 | 247 m | 38°14'3.8" N | 81°43'27.8" W | 
Old Fields : | 
 | 246 m | 39°8'4.9" N | 78°57'0.0" W | 
Old Gauley : | 
 | 455 m | 38°9'22.0" N | 81°11'30.8" W | 
Old Mill Village : | 
 | 746 m | 37°46'22.1" N | 81°13'5.2" W | 
Olive : | 
 | 349 m | 39°20'52.1" N | 80°27'32.0" W | 
Omar : | 
 | 284 m | 37°45'20.2" N | 81°59'58.9" W | 
Ona : | 
 | 
 | 38°25'28.9" N | 82°12'47.9" W | 
Onego : | 
 | 579 m | 38°50'52.1" N | 79°25'19.9" W | 
Onoto : | 
 | 739 m | 38°16'16.0" N | 80°6'24.8" W | 
Opal : | 
 | 660 m | 38°23'12.1" N | 80°45'59.0" W | 
Opekiska : | 
 | 326 m | 39°33'25.9" N | 80°3'20.9" W | 
Oral Lake : | 
 | 319 m | 39°16'31.1" N | 80°12'56.9" W | 
Oreide : | 
 | 365 m | 39°21'40.0" N | 80°12'0.0" W | 
Organ Cave : | 
 | 696 m | 37°42'46.1" N | 80°26'29.0" W | 
Orgas : | 
 | 244 m | 38°3'29.9" N | 81°34'21.0" W | 
Orient Hill : | 
 | 913 m | 38°1'41.2" N | 80°43'34.0" W | 
Orlando : | 
 | 244 m | 38°52'16.0" N | 80°35'38.0" W | 
Orleans Cross Roads : | 
 | 152 m | 39°37'27.8" N | 78°22'45.8" W | 
Orma : | 
 | 272 m | 38°44'53.2" N | 81°5'60.0" W | 
Orndoff : | 
 | 623 m | 38°32'15.0" N | 80°25'27.8" W | 
Orr : | 
 | 750 m | 39°33'11.9" N | 79°31'43.0" W | 
Ortin Heights : | 
 | 198 m | 38°26'51.0" N | 81°49'5.2" W | 
Orton : | 
 | 244 m | 38°50'6.0" N | 80°55'43.0" W | 
Orville : | 
 | 434 m | 37°48'51.1" N | 81°53'31.9" W | 
Osage (Osage) : | 163 | 288 m | 39°39'31.0" N | 80°0'28.1" W | 
Osborne : | 
 | 258 m | 38°29'57.1" N | 81°20'55.0" W | 
Osbornes Mills : | 
 | 214 m | 38°32'39.1" N | 81°18'29.2" W | 
Oscar : | 
 | 727 m | 38°3'31.0" N | 80°22'4.1" W | 
Osceola : | 
 | 1 097 m | 38°42'50.0" N | 79°38'1.0" W | 
Osgood : | 
 | 312 m | 39°34'0.1" N | 80°4'37.9" W | 
Ossia : | 
 | 276 m | 38°35'20.0" N | 81°1'36.8" W | 
Otsego : | 
 | 495 m | 37°36'45.0" N | 81°22'32.2" W | 
Ottawa : | 
 | 363 m | 37°57'31.0" N | 81°49'0.1" W | 
Otto : | 
 | 244 m | 38°45'7.9" N | 81°13'16.0" W | 
Ovapa : | 
 | 306 m | 38°31'17.0" N | 81°8'56.0" W | 
Overfield : | 
 | 365 m | 39°10'9.1" N | 80°12'15.8" W | 
Overhill : | 
 | 488 m | 38°57'42.8" N | 80°9'6.1" W | 
Owens Crossing : | 
 | 213 m | 38°21'5.0" N | 82°16'23.9" W | 
Owings : | 
 | 354 m | 39°22'45.8" N | 80°15'33.1" W | 
Oxbow : | 
 | 244 m | 39°5'38.0" N | 81°12'42.1" W | 
Oxford : | 
 | 273 m | 39°12'20.2" N | 80°51'54.0" W | 
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