Barrios de Colorado O

• Oak Valley Ranch (7)
• Oberon East (1)
• Old Colorado City (19)
• Old Farm (8)
• Old North Boulder (4)
• Old Town Fort Collins (14)
• Olde Town Arvada (3)
• Outer Aurora (109)
• Outer Central (7)
• Outer Lakewood-West Corridor (39)
• Outer Stapleton-East Denver (18)
• Overland (16)