Area Code 636

Missouri (MO) • Saint Charles, Ballwin, Chesterfield, O Fallon, Wildwood, Arnold, Augusta, Barnhart • Central Time (CT)

What Stands Out

•Coverage: 1.0M people across 67 ZIP codes.
•Major cities: Saint Charles, Ballwin, Chesterfield.

Spotlight: Coverage

Snapshot highlights for area code 636.

Income

82nd

Home values

68th

Poverty rate

29th

Area Code Basics

Primary State

Missouri (MO)

States Served

Missouri (MO)

Major Cities

Saint Charles, Ballwin, Chesterfield, O Fallon, Wildwood, Arnold, Augusta, Barnhart

Time Zone(s)

Central Time (CT)

Est. Population

1.0M

ZIP Codes

Data accuracy & methodology

This report aggregates 2020–2024 ACS 5-year estimates and geographic overlays for orientation. Area-code service areas can cross ZIP/state boundaries and change over time; verify official assignments with NANPA for critical use.