- Oak Creek (Population: 28,456)
- Oak Grove (Population: 1,522)
- Oakfield (Population: 1,012)
- Oakland (Population: 3,135)
- Oconomowoc (Population: 12,382)
- Oconto Falls (Population: 2,843)
- Oconto (Population: 4,708)
- Okauchee Lake (Population: 3,916)
- Omro (Population: 3,177)
- Onalaska (Population: 14,839)
- Oneida (Population: 4,001)
- Oostburg (Population: 2,660)
- Oregon (Population: 7,514)
- Orfordville (Population: 1,272)
- Osborn (Population: 1,029)
- Osceola (Population: 2,421)
- Oshkosh (Population: 62,916)
- Osseo (Population: 1,669)
- Ottawa (Population: 3,758)
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