Barrios de Colorado O

• Oak Hills (3)
• Oak Valley Ranch (12)
• Old Colorado City (35)
• Old Farm (8)
• Old North Boulder (3)
• Old Town Fort Collins (17)
• Olde Town Arvada (5)
• Outer Aurora (164)
• Outer Central (12)
• Outer Lakewood-West Corridor (27)
• Outer Stapleton-East Denver (22)
• Overland (23)