Colorado area codes

Colorado has 6 area codes: 303, 719, 720, 748, 970, 983.

• 303 — Denver
• 719 — Colorado Springs-Main
• 720 — Denver
• 748 — Fort Collins
• 970 — Fort Collins
• 983 — Denver

Area codes by city in Colorado

• Denver area codes
• Colorado Springs area codes
• Boulder area codes
• Aurora area codes
• Fort Collins area codes
• Grand Junction area codes
• Lakewood area codes
• Greeley area codes
• Longmont area codes
• Loveland area codes
• Westminster area codes
• Brighton area codes
• Littleton area codes

Sourced from the official NANPA (North American Numbering Plan Administrator) numbering database, current as of June 20, 2026. Refreshed monthly.