O Cities in Pennsylvania

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17 Pennsylvania cities and towns start with O, from Oakdale to Oxford. The largest is Oil City, with an estimated 9,368 people in July 2024, per the US Census Bureau.

Oakdale Oakland Oakmont Ohiopyle Ohioville Oil City Oklahoma Old Forge Olyphant Orangeville Orbisonia Orrstown Orwigsburg Osborne Osceola Mills Oswayo Oxford