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  3. Area code 636
Missouri (MO)Central Time (CT)

Area Code 636

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

1.0M

Population

67

ZIP codes

Missouri

Primary state

Central Time (CT)

Time zones

What stands out

  • Coverage: 1.0M people across 67 ZIP codes.
  • Major cities: Saint Charles, Ballwin, Chesterfield.
Primary state:Missouri (MO)/Major cities:Saint Charles, Ballwin, Chesterfield, O Fallon, Wildwood, Arnold, Augusta, Barnhart

Browse sections

Basics

Percentiles compare this area code to other area codes nationwide.

Population

1.0M

ZIP codes

67

Median age

40.8 yrs

Population density

376.1/sq mi

Mean commute time

27 min

Avg. household size

2.5

Neighbors

Neighboring area codes

314557573618730
Notes & Sources
  • Area-code boundaries can change over time; verify official assignments with NANPA for critical use.
  • This page aggregates ZIP-based crosswalks for orientation and does not indicate phone-number availability.

Data freshness

ACS 5-year
2020–2024
Page updated
2026-02-23

Release schedule and upstream dates: Sources.

Data sources

U.S. Census (ACS 5-year)U.S. Census TIGER/LineNANPA

Derived statistics

  • Area codes are not Census geographies; statistics are estimated by aggregating ZCTA (ZIP) values for associated ZIPs.
  • ZIP↔area code associations are derived from NPA boundary polygons and ZCTA centroid points, and can be approximate.
  • Median age, mean commute, and household size are population-weighted; population density uses summed ZIP land area.
Area code overlays and service areas are primarily governed by NANPA; this page uses aggregated geographic overlays for orientation only.

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.