Oviedo, Asturias, is the largest "O" city in Spain; its population is 214,883 and it is Spain's 23rd-largest city overall.
The one that comes to mind, though, is Oporto, Portugal. Oporto (Porto in Portuguese) is Portugal's second-largest city, and is internationally known for its main export, port wine.
The next-largest Portuguese city starting with "O" is Odivelas, in Lisboa province; Odivelas's population ranks 14th in the country, with 54,624 people.
Some southern US cities that start with the letter O:Oak Ridge, TennesseeOcilla, GeorgiaOdessa, TexasOpelika, AlabamaOlive Branch, MississippiOpelousas, LouisianaOrangeburg, South CarolinaOrlando, FloridaOzark, Arkansas
Cities in Illinois that start with the letter T:TaylorvilleTolucaToulonTroyTuscola
there are no cities in Washington that start with the letter j
Some NJ cities that start with B are:BayoneBloomfieldBridgewaterBerkeleyBergenfieldBernardsBridgeton
Oregon cities that start with the letter N:NehalemNewbergNewportNorth BendNorth PlainsNorth PowderNyssa
Ohio?
OregonOxford
I am not aware of any cities in Massachusetts that start with the letter O. However, Oxford, Orange, Orleans, Oak Bluff, and Otis are towns in Massachusetts.
orange, orwell, and Orleans
Oxford
Ocala
· Onida, South Dakota
Oklahoma, Ohio, and Oregon.
i don't know many but there is one called ohio- in america.
· Oak Ridge, Tennessee · White House, Tennessee
Reno, Nevada or Rio Claro, Colombia
Orange is a city in New South Wales, Australia.