Castle Rock, Colorado

ZIP codes in Castle Rock

Area codes for Castle Rock

• 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

Castle Rock is in the Mountain Time zone.

Towns near Castle Rock

• Castle Pines7.6 km (4.7 mi)
• The Pinery12 km (7.5 mi)
• Franktown12.6 km (7.8 mi)
• Parker13.9 km (8.6 mi)
• Stepping Stone14 km (8.7 mi)
• Louviers14.9 km (9.3 mi)
• Sierra Ridge15.6 km (9.7 mi)
• Stonegate16.7 km (10 mi)