St. Charles, Missouri

Nearest ZIP codes to St. Charles

These are the ZIP codes nearest to St. Charles, each listed with the post office it is named after.

Area codes for St. Charles

• Area code 636

  In service since May 22, 1999. Local calls are dialed with seven digits.

• Area code 314

  In service since 1947. Shares its area with 557. Local calls are dialed with ten digits; dialing 1 plus ten digits also works.

• Area code 557

  In service since August 12, 2022. Shares its area with 314. 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

St. Charles is in the Central Time zone.

Towns near St. Charles

• Saint Charles3.4 km (2.1 mi)
• Earth City5.2 km (3.2 mi)
• Flinthill5.3 km (3.3 mi)
• Champ7.8 km (4.8 mi)
• St. Peters7.9 km (4.9 mi)
• Saint Peters9.5 km (5.9 mi)
• Bridgeton10 km (6.2 mi)
• Maryland Heights10 km (6.2 mi)