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• O'Hara Township (Population: 8,856)
• Oak Hills (Population: 2,335)
• Oakdale (Population: 1,551)
• Oakland (Population: 622)
• Oakmont (Population: 6,911)
• Oakwood (Population: 2,249)
• Ohioville (Population: 3,759)
• Oil City (Population: 11,504)
• Old Forge (Population: 8,798)
• Old Orchard (Population: 2,443)
• Oliver (Population: 2,925)
• Olyphant (Population: 4,978)
• Orchard Hills (Population: 2,152)
• Oreland (Population: 5,509)
• Orwigsburg (Population: 3,106)
• Osceola Mills (Population: 1,249)
• Oxford (Population: 4,315)

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