North American Numbers Source-cited · ownership disclosed
Area code
314
In service
United States · since 1947

St. Louis

One of Missouri's two original 1947 area codes, 314 now serves the city of St. Louis and its inner-ring suburbs in St. Louis County. It is overlaid by 557.

The essentials Numbering data · NumberResearch · as of 2026-09-18
Place
St. Louis
Type
geographic
Status
in service
In service since
1947
Projected exhaust
2060 Q4

Status, dates and counts are read from NumberResearch (NANPA / CNAC / FCC records). Assignment records show initial assignees, not the carrier serving a number today.

A · Where it is

Where 314 is

City of St. Louis and inner St. Louis County suburbs..

Communities served wholly or partly by 314:

St. LouisKirkwoodWebster GrovesFergusonFlorissantBridgetonHazelwood

Reduced to core St. Louis exchanges after successive 1996 and 1999 splits.

B · Relationships

How it relates to other codes

The codes 314 was split from, spawned, or shares its area with. A split divides the map and changes some numbers; an overlay shares the same ground and changes none — what's the difference?

Spawned · 1996 573 Columbia / Jefferson City / eastern Missouri 573 split off from 314 for eastern/southeastern Missouri outside the metro.
Spawned · 1999 636 St. Charles / western St. Louis suburbs 636 split off from 314 for the western/outer St. Louis suburbs.
Overlay · 2022 557 St. Louis (overlay) All-services overlay covering the same 314 geography.
Related · 1947 618 Southern Illinois (Metro East) Southern Illinois, across the Mississippi River to the east.
What's changing. Overlaid by 557 since August 12, 2022; 10-digit dialing required.
C · History

How 314 got here

1947
Assigned as one of two original Missouri area codes (with 816).
Source: Wikipedia
1996-01-07
Geographic split created 573 for regions outside the St. Louis metro.
Source: Wikipedia
1999-05-22
Geographic split created 636 for outer suburbs; 314 reduced to core St. Louis.
Source: Wikipedia
2022-08-12
Area code 557 overlaid as 314 numbers neared exhaustion.
Source: Wikipedia
D · Capacity

How full it is

Prefixes assigned
800
Prefixes available
0
Thousands-blocks assigned
3,374

Prefix-assignment counts describe allocation to carriers, not how many individual numbers are in use. Full technical records: NumberResearch ↗.

Compare 314 with another code →
Sources
Wikipedia ↗
Area codes 314 and 557
NumberResearch.org ↗
Live status, dates, assignment counts and exhaust forecast — data as of 2026-09-18 (CC BY 4.0).

Place, relationships and history above are compiled by North American Numbers from the sources listed and last checked 2026-09-18. A check date is not an expert review — see how this is made. Flag an error.