Area codes in St Louis, Missouri
St Louis, Missouri uses 2 area codes — 314 and 557. The main St Louis area code is 314.
Area codes serving St Louis
Phone numbers in St Louis are written as ten digits — for example (314) 555-0190 — and fall in the Central Time zone.
How St Louis came to have 2 area codes
The original St Louis area code is 314, in service since 1947. As the area ran low on available numbers, an overlay code was added over the same region for new phone lines: 557 (2022). Existing numbers kept their original code — an overlay never forces anyone to change their number — which is why St Louis now uses all 2 codes and every local call is dialed with ten digits.
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Frequently asked questions
What is the area code for St Louis?
The main area code for St Louis, Missouri is 314. St Louis is now served by 2 area codes in total: 314, 557.
How many area codes does St Louis have?
St Louis has 2 area codes: 314, 557.
Why does St Louis have more than one area code?
As St Louis used up the numbers available in its original area code (314, in service since 1947), additional "overlay" codes were added over the same area so new phone numbers could keep being assigned.
How do you dial a St Louis number?
Dial all 10 digits — the area code (314 or 557) followed by the 7-digit local number. From abroad, dial +1, then the area code and number.
Sourced from the official NANPA (North American Numbering Plan Administrator) numbering database, current as of August 2, 2026. Refreshed monthly.