Area Code Overview

Area code 636 is a geographic telephone area code in Missouri that went into service on May 22, 1999. The geographic regions covered by this area code overlay has a population of approximately 1,012,776.

Overlay and Dialing Rules

Area Code: 636
State: Missouri
Type: General Purpose Code
In Service Date: May 22, 1999
Overlay Complex: 636
Local Dialing Plan: This area does not require you to dial the area code when calling locally.

Estimated Number of Assigned Phone Numbers in Area Code 636

This area code is ranked 255th out of 363 nationwide in estimated assigned phone numbers. Within the state territory it serves, it is ranked 6th out of 9.

3,091,000

Estimated Service-Type Mix of Assigned Phone Numbers in Area Code 636

Total assigned 3,091,000

Wireless

911,000 assigned

29.47%

Wireline and VoIP

1,932,000 assigned

62.50%

Other / Unclassified

248,000 assigned

8.02%

Estimated Share of Wireless Numbers Originally Assigned to Each Carrier in Area Code 636

Estimated assigned wireless phone numbers: 911,000

Numbers may later be ported to another carrier, but this chart reflects original number assignment, not current subscriber share.

AT&T Wireless 403,000 (44.24%)

T-Mobile 346,000 (37.98%)

Verizon Wireless 162,000 (17.78%)

Estimated Share of Wireline and VoIP Numbers Originally Assigned to Each Carrier in Area Code 636

Estimated assigned wireline and VoIP phone numbers: 1,932,000

Onvoy 562,000 (29.09%)

AT&T 452,000 (23.40%)

MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 162,000 (8.39%)

Bandwidth 156,000 (8.07%)

Lumen 138,000 (7.14%)

CHARTER IP ENABLED SERVICES, LLC 110,000 (5.69%)

Peerless Network 97,000 (5.02%)

Spectrum 65,000 (3.36%)

TERRA NOVA TELECOM INC. 61,000 (3.16%)

PAETEC ITEL, LLC 53,000 (2.74%)

Telnyx 50,000 (2.59%)

Commio 20,000 (1.04%)

Other / Unclassified Assigned Numbering in Area Code 636

Estimated assigned other or unclassified phone numbers: 248,000

BRIGHTSPEED OF MISSOURI, LLC 132,000 (53.23%)

TELEPORT COMMUNICATIONS AMERICA, LLC - MO 40,000 (16.13%)

IP HORIZON LLC 25,000 (10.08%)

SPOK, INC. 20,000 (8.06%)

AMERICAN MESSAGING SERVICES, LLC 10,000 (4.03%)

TON80 COMMUNICATIONS, LLC 9,000 (3.63%)

AURORA COMMUNICATIONS, INC. - MO 3,000 (1.21%)

FRACTEL, LLC 3,000 (1.21%)

HD CARRIER LLC 3,000 (1.21%)

CHARITON VALLEY COMMUNICATIONS CORPORATION 2,000 (0.81%)

EXIANT COMMUNICATIONS LLC 1,000 (0.40%)

Cities and Towns in Area Code 636

Antonia, Missouri Augusta, Missouri Cedar Hill, Missouri Chesterfield, Missouri Dardenne, Missouri De Soto, Missouri Defiance, Missouri Eureka, Missouri Fenton, Missouri Festus, Missouri Foley, Missouri Foristell, Missouri Gray Summit, Missouri Harvester, Missouri Hawk Point, Missouri Herculaneum, Missouri High Hill, Missouri High Ridge, Missouri Hillsboro, Missouri Holstein, Missouri Imperial, Missouri Jonesburg, Missouri Manchester, Missouri Marthasville, Missouri Maxville, Missouri Moscow, Missouri New Melle, Missouri O Fallon, Missouri Old Monroe, Missouri Orchard Farm, Missouri Pacific, Missouri Pond, Missouri Saint Charles, Missouri Saint Clair, Missouri Saint Peters, Missouri Troy, Missouri Truxton, Missouri Union, Missouri Valley Park, Missouri Ware, Missouri Warrenton, Missouri Washington, Missouri Wentzville, Missouri Winfield, Missouri Wright City, Missouri

How These Figures Were Built

These figures are estimates based on public phone-number assignment records. They are meant to show the likely mix of assigned phone numbers associated with area code 636, not live customer counts.

Some providers may have assigned phone numbers tied to this area code even if they do not actively market or sell service locally. These figures reflect public number-assignment records, not confirmed local service availability.

They also do not reflect number portability at the individual phone-number level, so some numbers may now be used on a different network or by a different provider than the original assignment records suggest.

Population data and locality matching provided by GeoNames.

Last refreshed: April 15, 2026 6:22 pm