Area Code 303 – Colorado

Area Code Details

Area Code

303

State / Province

Colorado

Country

United States

Time Zone

MT

IANA Zone

America/Denver

Country Code

US

Cities & Counties

Denver County

Denver

Arapahoe County

Aurora

Boulder County

Boulder

Other Area Codes in Colorado (3)

• 719 — MT
• 720 — MT
• 970 — MT

Nearby Area Codes

• 302 — Delaware (US • ET)
• 304 — West Virginia (US • ET)
• 301 — Maryland (US • ET)
• 305 — Florida (US • ET)
• 306 — Saskatchewan (CA • CT)
• 307 — Wyoming (US • MT)

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Frequently Asked Questions

What time zone is area code 303 in?

Area code 303 is in the MT time zone (America/Denver). It serves Colorado, United States.

Where is area code 303 located?

Area code 303 covers Colorado in United States. Major cities include Denver, Aurora, Boulder.

What cities use area code 303?

Cities served by area code 303 include: Denver, Aurora, Boulder.

What is the current time in area code 303?

The live clock on this page shows the real-time current time for area code 303 (MT time zone). It updates every second.

Is area code 303 in the US or Canada?

Area code 303 is in United States (US), specifically in Colorado.

What other area codes are in Colorado?

Other area codes in Colorado include: 719, 720, 970.

How do I call area code 303 from another time zone?

When calling area code 303, remember it's in the MT time zone. Use the time converter above to find the best time to call.

What counties does area code 303 cover?

Area code 303 covers: Denver County, Arapahoe County, Boulder County.