Signal Mountain, Tennessee

ZIP codes in Signal Mountain

Area codes for Signal Mountain

• Area code 423

  In service since September 11, 1995. Shares its area with 729. Local calls are dialed with ten digits; dialing 1 plus ten digits also works.

• Area code 729

  In service since September 5, 2025. Shares its area with 423. 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.

Towns near Signal Mountain

• Walden2.9 km (1.8 mi)
• Fairmount4.2 km (2.6 mi)
• Red Bank5.6 km (3.5 mi)
• Lone Oak6.4 km (4.0 mi)
• Lupton City8.3 km (5.2 mi)
• Falling Water8.7 km (5.4 mi)
• Hixson10.8 km (6.7 mi)
• Chattanooga12.9 km (8.0 mi)