- Oakland (1)
- Oelwein (2)
- Ogden (1)
- Okoboji (3)
- Orange City (14)
- Osceola (4)
- Oskaloosa (8)
- Ottumwa (11)
- Oxford Junction
- Today Oelwein's population numbers 6, 772 within its city limits with several hundred more living on the outskirts of our fair city and twenty industries call Oelwein their home.www.oelwein.com
- Directory of churches in Oelwein, Iowa.www.churchangel.com/WEBIA/oelwein.htm
- Directory of Churches in Orange City, IAwww.churchangel.com/WEBIA/orangecity.htm