720 Area Code: Denver Location, Time Zone & Scam Check (2026)
The 720 area code covers Denver-Boulder, Colorado — the Mile High City. Learn its history, Mountain time zone, scam risk, 300+ days of sunshine, and how to call Denver internationally.
The 720 area code covers the Denver-Boulder metropolitan area in north-central Colorado. Created in 1998 as an overlay to 303, it serves approximately 3.9 million people across 10 counties along the Front Range — America's Mile High City.
Quick Facts
- Location: Denver, Boulder, Aurora, Lakewood, Arvada, Westminster
- Time Zone: Mountain Time (MT) — UTC-7 / UTC-6 DST
- Created: 1998 (overlay of 303)
- Counties: Denver, Jefferson, Arapahoe, Adams, Boulder, Douglas + 4 more
- Fun fact: Denver averages 300+ days of sunshine per year
Is 720 a Scam Area Code?
Colorado ranks #4 nationally for imposter scam reports. Coloradans received over 290 million scam calls in 9 months of 2025. Verify calls with our Spam Number Checker.
How to Call 720 Internationally
Dial exit code + 1 + 720 + 7-digit number. On mobile: +1-720-XXX-XXXX. Use Best Time to Call for Mountain Time info. Check our rates.
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