Cities in area code 557
Which places use area code 557? 7 rate centers in Missouri, the biggest being Saint Louis, Ladue, Kirkwood. Data below is NANPA's official prefix-to-rate-center mapping.
By numbering footprint the leading localities are Saint Louis, Ladue, Kirkwood, Creve Coeur, Mehlville, Sappington and Oakville. Prefix counts track lines in service, so the ranking is a reasonable proxy for where the code's subscribers actually are.
7 of the localities fall within FCC top-100 metropolitan statistical areas; the rest are smaller communities.
7 of these localities are also reachable through other area codes — overlay territory where the same place answers to several codes.
All of the code's territory keeps Central time.
Remember that people keep numbers when they relocate, so a 557 number is a where-it-was-issued fact, not a where-they-are fact.
| Locality (rate center) | Active prefixes | Metro area | All codes serving it |
|---|---|---|---|
| Saint Louis | 30 | St. Louis, MO-IL | 314, 557 |
| Ladue | 13 | St. Louis, MO-IL | 314, 557 |
| Kirkwood | 9 | St. Louis, MO-IL | 314, 557 |
| Creve Coeur | 5 | St. Louis, MO-IL | 314, 557 |
| Mehlville | 4 | St. Louis, MO-IL | 314, 557 |
| Sappington | 4 | St. Louis, MO-IL | 314, 557 |
| Oakville | 1 | St. Louis, MO-IL | 314, 557 |
FAQ
What is the biggest city in area code 557?
Saint Louis holds the most active prefixes (30), making it the code's largest numbering locality.
How many places does 557 cover?
7 rate centers in Missouri hold active 557 prefixes, from Saint Louis down to communities with a single prefix.
Does a 557 number guarantee the caller lives in one of these places?
No — the tables show where number blocks were issued. Porting and VoIP let people keep or acquire numbers anywhere.