New Castle, Colorado

ZIP codes in New Castle

Area codes for New Castle

• Area code 970

  In service since April 2, 1995. Shares its area with 748. Local calls are dialed with ten digits; dialing 1 plus ten digits also works.

• Area code 748

  In service since July 7, 2025. Shares its area with 970. 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

New Castle is in the Mountain Time zone.

Towns near New Castle

• Chacra7.6 km (4.7 mi)
• Silt13 km (8.1 mi)
• Glenwood Springs19 km (12 mi)
• Rifle21.3 km (13 mi)
• No Name21.5 km (13 mi)
• Carbonate26.1 km (16 mi)
• Cattle Creek26.9 km (17 mi)
• Mulford37.2 km (23 mi)