Area Code 314

Missouri

Area code 314 serves Missouri, primarily St. Louis, in the Central Time (CT) time zone. It has served the region since 01-Jan-1947.

Published: Updated:

Overlay Area Code

This area code is part of an overlay region, meaning the same geographic area is served by multiple area codes. Overlay codes were introduced to meet growing demand for phone numbers without requiring existing customers to change their numbers.

This area code shares its geographic region with: area code 557 (St. Louis).

In service since: 01-Jan-1947

Learn more about overlay and split area codes →

Area Code Splits

Parts of this area code’s original geographic region were later assigned new area codes through splits. When a split occurs, some customers in the original area code region are assigned the new area code.

Split into: area code 573 (Columbia), area code 636 (O'Fallon).

Learn more about overlay and split area codes →

Demographics & Economics

Total Population
1,346,864
Population Density
2,582 people/sq mi
above U.S. average (U.S.: 93 people/sq mi)
Median Household Income
$81,340
near U.S. median (U.S.: $75,144)
Poverty Rate
13.8%
above U.S. average (U.S.: 11.5%)
Unemployment Rate
4.5%
above U.S. average (U.S.: 3.6%)
Education Attainment
Bachelor's Degree+
44.1%
above U.S. average (U.S.: 33.7%)
High School or Lower
24.7%

Statistics are population-weighted aggregations from Census ACS 5-year estimates. Population figures are approximate — see Sources & Methodology for details on how area code populations are derived.

See how this area code compares to all US area codes in the Statistics dashboard.

Time Zone

  • Central Time (CT)

NANPA Relief Status

According to the latest NANPA analysis (July 2026), this area code is not currently listed as exhausting within the next 36 months. No relief planning is in progress for this NPA.

Source: NANPA NPA Relief Planning Reports · See all relief planning statuses

Current Time

Central Time (CT)
 
 

Prefix Utilization

Geographic Coverage

State

MO

Major Cities

  • St. Louis
  • Florissant
  • Chesterfield
  • Oakville
  • University City
  • Kirkwood
  • Mehlville
  • Maryland Heights
  • Hazelwood
  • Webster Groves
  • Old Jamestown
  • Affton
  • Creve Coeur
  • Ferguson
  • Spanish Lake
  • Concord
  • Clayton
  • Lemay
  • Overland
  • Jennings
  • St. Ann
  • Crestwood
  • Town and Country
  • Bridgeton

and 66 more cities

Area Code 314 geographic coverage map (light mode)

Historical Timeline of Area Code 314

Area code 314 was created on January 1, 1947, as one of the original 86 North American area codes, covering all of eastern Missouri. Missouri was divided into two NPAs: 314 for the eastern half and 816 for the western half. St. Louis was designated a Regional Center in AT&T's 1929 General Toll Switching Plan, one of six nationwide. The code has undergone two geographic splits and one overlay implementation across 79 years. Source: Wikipedia

  • 1947: Created as the original area code for eastern Missouri. St. Louis designated as a Regional Center in AT&T's 1929 General Toll Switching Plan. Source: Wikipedia
  • 1996: Geographic split. Area code 573 created January 7, 1996. Central and southeastern Missouri (Jefferson City, Columbia, Cape Girardeau) moved to 573. Missouri PSC ordered the split over industry's preferred overlay. Source: Missouri PSC
  • 1999: Geographic split. Area code 636 created May 22, 1999. Outer St. Louis suburbs moved to 636, reducing 314 to core St. Louis area including Webster Groves, Ferguson, Kirkwood, and Mehlville. Source: Wikipedia
  • 2000: All-services overlay approved. Missouri PSC approved 557 as relief area code (Case No. TO-2000-374). Implementation originally scheduled for 2002. Source: Missouri PSC
  • 2001: Implementation suspended. 557 overlay suspended indefinitely September 25, 2001, after number conservation measures extended 314's usable life. Source: Wikipedia
  • 2022: 557 overlay went into service August 12, 2022. Mandatory 10-digit dialing took effect July 15, 2022 to accommodate the 988 National Suicide Prevention Lifeline code. Source: Missouri PSC

The 557 overlay was approved in 2000 but delayed for over 21 years due to successful number conservation efforts, including number pooling. This delay ranks among the longest between overlay approval and implementation in the North American Numbering Plan.

Regulatory History

Area code 314 has been shaped by six significant regulatory events over 27 years, from the initial 573 split order through the 2022 557 overlay implementation. The FCC and Missouri PSC governed these actions through a combination of state commission orders and federal oversight. Source: FCC

YearEventDocketRegulatory Action & Impact
1995573 Geographic SplitCase TO-95-289Missouri PSC ordered geographic split of 314 NPA, creating area code 573 for central and southeastern Missouri. The Commission rejected the overlay plan proposed by Southwestern Bell. Split effective January 7, 1996. Source: Missouri PSC
1998FCC Guideline WarningDA-98-2636FCC approved 314/636 split relief despite NANPA's objection about projected lifetime imbalance (314 until 2012, 636 until 2045). FCC warned it would "review carefully and critically any future area code relief plans that are clearly outside the industry guidelines." Source: FCC DA-98-2636
2000557 Overlay ApprovedCase TO-2000-374Missouri PSC approved all-services overlay for 314 NPA with 557 as the relief area code. Implementation originally scheduled for 2002. NANPA recommended retroactive overlay (extending 636 to cover 314). Source: Missouri PSC
2001557 Overlay SuspendedCase TO-2000-374Missouri PSC suspended 557 overlay implementation indefinitely on September 25, 2001. Number conservation measures, including number pooling, proved effective and extended 314's usable life by over 20 years. Source: Wikipedia
2021Notice to ProceedFile TO-2022-0010Missouri PSC issued notice to proceed with 557 overlay implementation. NANPA PL-567 issued October 28, 2021. Mandatory 10-digit dialing transitioned by July 15, 2022 to accommodate 988 lifeline code. Source: Missouri PSC
2022557 In ServiceFile TO-2022-0010557 overlay went into service August 12, 2022. All local calls within 314/557 region require 10-digit dialing. 557 codes available only when all 314 codes exhausted. Source: Missouri PSC

County Coverage

Population-weighted county share based on aggregated ZCTA population (100% = total mapped population for area code 314).

CountyPopulationShare
St. Louis, MO794,29959.0%
St. Louis city, MO552,56541.0%

Area Code 314 Family Tree

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314557573636235
5
Total Codes
2
Splits
2
Overlays
2
Max Depth

All Descendants

Code ▲StateType In Service Parent
235MOoverlay24-Mar-2024573
557MOoverlay12-Aug-2022314
573MOsplit07-Jan-1996314
636MOsplit22-May-1999314

Area code 314 was originally assigned in 01-Jan-1947 to serve MO. Over the years, it has generated 4 descendant area codes through a combination of geographic splits and overlays as demand for telephone numbers grew.

Call Context

High-density metropolitan area

This area code serves a major metropolitan region with high population density in MO. The primary city is St. Louis.

Nearby Area Codes

Area codes geographically closest to 314.

Area code 636 map card showing O'Fallon (light mode)
636MOO'FallonCentral Time (CT)Split
Area code 235 map card showing Columbia (light mode)
235MOColumbiaCentral Time (CT)Overlay
Area code 573 map card showing Columbia (light mode)
573MOColumbiaCentral Time (CT)Geographic
Area code 618 map card showing Belleville (light mode)
618ILBellevilleCentral Time (CT)Geographic
Area code 730 map card showing Belleville (light mode)
730ILBellevilleCentral Time (CT)Overlay
Area code 217 map card showing Springfield (light mode)
217ILSpringfieldCentral Time (CT)Geographic
Area code 447 map card showing Springfield (light mode)
447ILSpringfieldCentral Time (CT)Overlay

Other Area Codes in Missouri

Area codes that also serve Missouri, linked for easy comparison.