Missouri · Central Time
314 Area Code
Area code 314 is in Missouri, serving St. Louis city and most of St. Louis County in eastern Missouri. It is in the Central Time zone. It shares its territory with overlay code 557, so 10-digit dialing is required.
Last updated October 1, 2026 · Source: NANPA
Where is the 314 area code?
314 is a Missouri area code covering St. Louis city and most of St. Louis County in eastern Missouri. In the wider directory it sits in the Midwest region.
Cities in the 314 area code
- St. Louis
- Florissant
- University City
- Kirkwood
- Maryland Heights
- Webster Groves
- Hazelwood
- Ferguson
- Creve Coeur
- Clayton
- Oakville
- Mehlville
- Affton
Counties served by 314
St. Louis County and City of St. Louis.
314 overlay codes and dialing
The 314 territory is covered by an overlay of 2 area codes: 314, 557. All of them serve the same geographic area, and the original code is 314. Because more than one code covers the same ground, 10-digit dialing is mandatory — you must dial the area code for every local call. New phone lines may be assigned any of these codes.
History of the 314 area code
314 is one of the original area codes assigned in 1947, when AT&T and Bell Laboratories created the North American Numbering Plan and divided the country into the first 86 numbering plan areas. It has served the St. Louis area ever since, with 557 later added as an overlay to supply more numbers.
Is 314 a scam or spam risk?
314 is a legitimate geographic area code, not a premium or toll line, so a call from it costs you nothing extra. That said, scammers frequently spoof real local area codes to look familiar on caller ID. A genuine 314 number on your screen is no guarantee the caller is in St. Louis, MO or trustworthy. See spam & scam-risk area codes for how spoofing works and how to respond.
Other Missouri area codes
Explore more
See every code in Missouri, compare codes across the Midwest region, or view all Central Time codes. You can also browse the 3XX block or the complete numeric list of US area codes.
New to how this all works? Start with how area codes work, then read up on overlays, 10-digit dialing, and spam & scam-risk codes. To check another number, use the area code lookup tool.
Quick answers
314 area code FAQ
Where is the 314 area code?
The 314 area code is in Missouri, covering St. Louis city and most of St. Louis County in eastern Missouri, in the Midwest region.
What cities are in the 314 area code?
Cities in the 314 area code include St. Louis, Florissant, University City, Kirkwood, Maryland Heights, Webster Groves, Hazelwood, Ferguson, Creve Coeur and Clayton.
What time zone is 314 in?
314 is in the Central Time zone.
What is the overlay for the 314 area code?
314 shares its territory with 557. Both codes (314, 557) serve the same area, so 10-digit dialing is required for every call.
When did the 314 area code start?
314 went into service on January 1, 1947 as one of the original 1947 North American area codes.
Do I have to dial 10 digits for 314?
Yes. Because 314 is an overlay area, you must dial the full 10-digit number (area code + 7 digits) for every call.
Is 314 a toll-free or premium code?
No. 314 is a standard geographic area code, so calling it costs the same as any local or long-distance call on your plan. Toll-free calls use 800, 888, 877, 866, 855, 844 or 833.