OAHALS - Nidaros
OAKS - Girard
OBERT - Dead Lake, Star Lake
OCHSNER - Girard
ODEGAARD - Eagle Lake
OHTONEN - Newton
OKEEFE - Oak Valley
OKERSON - Erhard Grove
OKESON - Eagle Lake
OKINS - Woodside
OLANG - Dane Prairie
OLANSEN - Nidaros
OLEMB - Erhard Grove
OLESEN - St. Olaf, Tumuli
OLESON - Dane Prairie, Deer Creek, Fergus Falls, Sinclair, St. Olaf, Sverdrup
OLIVER - Butler, Frieburg
OLIVERSON - Tumuli
OLLIKAINE - Newton
OLSEN - Aastad, Aurdal, Blowers, Buse, Clitherall, Dane Prairie, Dead Lake, Dunn, Eagle Lake, Effington, Elizabeth, Erhard Grove, Folden, Henning, Inman, Leaf Mountain, Nidaros, Norwegian Grove, Oscar, Otto, Pelican, Sinclair, St. Olaf, Sverdrup, Tordenskjold, Trondjem, Tumuli
OLSON - Aastad, Aurdal, Carlisle, Clitherall, Dane Prairie, Eagle Lake, Eastern, Effington, Elmo, Erhard Grove, Folden, Frieburg, Henning, Leaf Mountain, Maine, Maplewood, Nidaros, Norwegian Grove, Oscar, Parkers Prairie, Pelican, Sinclair, St. Elmo, St. Olaf, Sverdrup, Tordenskjold, Trondjem, Tumuli, Western
OLSSON - Bluffton, Dane Prairie, Eagle Lake, Nidaros, Parkers Prairie
OLSTAD - Tordenskjold
OMANS - Corliss, Hobart
ONSUM - Pelican
OPHUS - Pelican
OPPEGAARD - Leaf Lake
OPPERMEN - Fergus Falls
OREILLY - Dunn
OREN - Eagle Lake
ORR - Elmo, St. Elmo
ORTON - Oscar
ORVIS - Compton
ORZEL - Edna
OSBORN - Oak Valley
OSMUN - Sverdrup
OSMUNDSON - Erhard Grove
OSNES - St. Olaf
OSTRANDER - Bluffton, Woodside
OSTRUM - Elizabeth
OSWALD - Corliss
OTT - Dora, Star Lake
OUREN - Trondjem
OUSE - Buse, Frieburg
OVERLAND - Clitherall