Colorado area codes

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

• 303 — Denver
• 719 — Colorado Springs
• 720 — Denver
• 748 — Boulder
• 970 — Boulder
• 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

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