What time zone is area code 636 in?

Area code 636 uses Central Time.

Is a call from area code 636 a scam?

The area code alone doesn’t tell you. Most calls from 636 are ordinary local calls, but scammers can fake (“spoof”) any number. If you don’t recognize a 636 number, let it go to voicemail.

When did area code 636 start?

636 went into service in 1999. It was created from area code 314.

Can a 636 number be outside Missouri?

Yes. People keep their numbers when they move and when they switch to mobile or internet phone services, so a 636 caller can be anywhere.

Area code 636

Where is area code 636?

St. Peters, St. Charles and Chesterfield, Missouri

Local time: … (Central Time)

State	Missouri
Country	United States
Main cities	St. Peters, St. Charles and Chesterfield
Time zone	Central Time
Overlay area codes	None
In service since	1999 (created from 314)
Assigned prefixes	435
Dialing format	(636) XXX-XXXX · +1 636 XXX XXXX from abroad

Look up a 636 number

Cities and towns in area code 636

Listed by how many phone prefixes (the 3 digits after the area code) are assigned to each place in 636.

St. Peters, MO (51)
St. Charles, MO (44)
Chesterfield, MO (36)
Ballwin, MO (27)
O'Fallon, MO (24)
Fenton, MO (16)
Festus, MO (16)
Valleypark, MO (14)
Wentzville, MO (14)
Arnold, MO (13)
Washington, MO (13)
Union, MO (12)
Troy, MO (11)
High Ridge, MO (10)
Imperial, MO (10)
Warrenton, MO (10)
Cedar Hill, MO (8)
De Soto, MO (7)
Pond, MO (7)
Portagsiux, MO (7)
Antonia, MO (6)
Eureka, MO (6)
Lake Saint Louis, MO (6)
Pacific, MO (6)
Saint Clair, MO (6)
Foristell, MO (5)
Graysummit, MO (5)
Hillsboro, MO (5)
Pevely, MO (5)
Winfield, MO (4)
Ware, MO (3)
Wright City, MO (3)
Augusta, MO (2)
Defiance, MO (2)
Foley, MO (2)
Hawk Point, MO (2)
Holstein, MO (2)
Jonesburg, MO (2)
Marthasville, MO (2)
Moscow Ml, MO (2)
New Melle, MO (2)
Old Monroe, MO (2)
Orchardfrm, MO (2)
High Hill, MO (1)
House Springs, MO (1)
Truxton, MO (1)

Phone companies in area code 636

The carriers that hold the most 636 prefixes. People can move their number to another carrier, so this shows who first issued a number, not who serves it today.

Prefixes	Carrier
110	Southwestern Bell (AT&T)
49	Brightspeed of Missouri
36	Onvoy
35	T-Mobile USA
29	New Cingular Wireless PCS (AT&T)
29	Level 3 Communications
28	Mcimetro Access Transmission Services
25	Paetec Itel

All 435 prefixes in area code 636

Pick the 3 digits after the area code to see that prefix’s city and carrier.

Questions

Where is area code 636?: Area code 636 is in Missouri. It serves St. Peters, St. Charles, Chesterfield, Ballwin and O'Fallon and 41 other cities and towns.
What time zone is area code 636 in?: Area code 636 uses Central Time.
Is a call from area code 636 a scam?: The area code alone doesn’t tell you. Most calls from 636 are ordinary local calls, but scammers can fake (“spoof”) any number. If you don’t recognize a 636 number, let it go to voicemail.
When did area code 636 start?: 636 went into service in 1999. It was created from area code 314.
Can a 636 number be outside Missouri?: Yes. People keep their numbers when they move and when they switch to mobile or internet phone services, so a 636 caller can be anywhere.

Other area codes in Missouri

Area code	Main cities
235	Birch Tree, Cape Girardeau and Columbia
314	St. Louis, Crevecoeur and Florissant
417	Springfield, Joplin and Branson
557	St. Louis and Crevecoeur
573	Columbia, Jefferson City and Cape Girardeau
660	Sedalia, Kirksville and Warrensburg
816	Kansas City, St. Joseph and Lee's Summit
975	Kansas City, Blue Springs and Adrian