Provinces or States with O

• Ohio

  U.S. state in the Midwest, capital is Columbus.

• Oklahoma

  U.S. state in the south-central region, capital Oklahoma City.

• Odisha

  State of India on east coast, capital Bhubaneswar.

• Okinawa

  Prefecture (province-level) of Japan, island region.

• Oaxaca

  State of Mexico, capital Oaxaca de Juárez.

• Oxfordshire

  Ceremonial and historic county in England.

• ONTARIO

  Canadian province; capital is Toronto.

• Oriental Mindoro

  Philippine province on Mindoro island.

• Oceania

The words in the list Provinces or States with O come from players of the word game City, Country, River.