Ogallala, Nebraska was an old cattle town. Cattle drives reached the Union Pacific Railroad at Ogallala.
Omaha
oats are eaten by cattle
Oakey and Ourimbah are towns in Australia. Old Junee is a town in Australia.
Overdrive?
Old Navy, Osh Kosh
old
Old English SheepdogOx
Obstinate Orderly Old fashioned Opportunistic Odd
You could use Northwest Ordinance or "old"
· OshKosh B'Gosh
Old Oat
otterhound old English sheep dog old English bulldog