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Area code 557

Area code 557 St. Louis, Missouri

Area code 557 is one of the newer area codes, added in 2022 to Missouri, with numbers assigned in St. Louis, Ladue, Kirkwood and 4 more places. It’s 11:12 PM there now.

State
Missouri9 area codes in Missouri
Time zone
Central11:12 PM there now
Exchanges
847 places
Overlay
314Same area, 10-digit dialing
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Where area code 557 is

Numbers in 557 are assigned to 7 places in 2 counties: St. Louis County and St. Louis city.

St. Louis has the most, 43% of the exchanges; the rest are spread across 6 other places.

  • St. Louis36
  • Ladue17
  • Kirkwood13
  • Creve Coeur6
  • Mehlville5
  • Sappington5
  • Oakville2

Phone companies in 557

84 blocks of numbers in 557 are held by 18 phone companies. The most belong to AT&T Mobility (23), Inteliquent (19) and AT&T (TCG) (15).

A large share, about 56%, belongs to competitive and internet phone carriers; wireless networks hold 39% and local phone and cable companies 5%.

A block’s holder is the company it was first assigned to; numbers can move to other carriers since.

History and overlays

557 went into service in 2022, added to the area of 314.

314 (since 1947) shares the same area, so a new number there can get any of these codes and local calls are dialed with all 10 digits.

84 new exchanges were assigned since 2021, the latest in October 2026.

Calling 557

It’s 11:12 PM Central time in 557 right now.

From elsewhere in the U.S., dial 1, 557 and the 7-digit number; inside the area, all 10 digits too.

Nearby area codes

Missouri has 9 area codes: 235, 314, 417, 557, 573, 636, 660, 816 and 975.

From the North American Numbering Plan Administrator’s area code and exchange records (10/22/2026) and U.S. Census place and county names. Places and companies are where number blocks were assigned, not where anyone lives or which carrier a number uses today.

Map of the 557 area code

Map of the 557 area code around St. Louis, Ladue and Kirkwood, Missouri.

Interactive map © OpenStreetMap contributors

Cities on the map

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Questions about 557

Where is area code 557?

In Missouri, covering St. Louis, Ladue and Kirkwood and other places across 2 counties.

What time zone is 557 in?

Central time. It was 11:12 PM there when this page loaded.

Is 557 an overlay?

Yes. 314 serves the same area, so dial all 10 digits for local calls.

Which phone companies have 557 numbers?

18 companies hold blocks; the most belong to AT&T Mobility, Inteliquent and AT&T (TCG). About 39% of blocks are wireless.

Is 557 running out of numbers?

Not on record. 84 new exchanges have been assigned since 2021.