Frederick, Colorado

ZIP codes in Frederick

Area codes for Frederick

• Area code 303

  In service since 1947. Shares its area with 720 and 983. Local calls are dialed with ten digits; dialing 1 plus ten digits also works.

• Area code 720

  In service since June 1, 1998. Shares its area with 303 and 983. Local calls are dialed with ten digits; dialing 1 plus ten digits also works.

• Area code 983

  In service since June 17, 2022. Shares its area with 303 and 720. Local calls are dialed with ten digits; dialing 1 plus ten digits also works.

Area codes here are matched from telephone rate centers, so a place near a boundary can have local numbers from either side of it.

Time zone

Frederick is in the Mountain Time zone.

Towns near Frederick

• Dacono1.6 km (1.0 mi)
• Firestone1.7 km (1.1 mi)
• Fort Lupton10.9 km (6.8 mi)
• Erie12.6 km (7.8 mi)
• Todd Creek14.2 km (8.8 mi)
• Longmont14.4 km (8.9 mi)
• Aristocrat Ranchettes14.4 km (8.9 mi)
• Leyner16 km (9.9 mi)