Area Code 557
Area code 557 is in Missouri, USA , spanning 1 county and serving 21 cities, including St Louis, University City or Mehlville; it currently uses 52 prefixes, assigned from 557-200-XXXX through 557-999-XXXX.
In service since August 12, 2022, area code 557 is an overlay Numbering Plan Area, part of overlay complex 314/557.
The current local time is .
For exact NPA boundaries see official 557 area code map
Phone number lookup
More Missouri area codes:
Locate any 557-NXX prefix:
| NPANXX | Area Served1 | Date1 |
|---|---|---|
| 557-200 | Ladue | 8/8/2022 |
| 557-201 | Kirkwood | 04/14/2023 |
| 557-202 | St Louis | 03/27/2023 |
| 557-203 | Mehlville | 05/19/2023 |
| 557-204 | St Louis | 05/22/2023 |
| 557-205 | St Louis | 06/01/2023 |
| 557-206 | St Louis | 06/01/2023 |
| 557-207 | Oakville | 06/15/2023 |
| 557-208 | Ladue | 09/07/2023 |
| 557-209 | Kirkwood | 02/29/2024 |
| 557-210 | Ladue | 09/21/2023 |
| 557-212 | Mehlville | 09/29/2023 |
| 557-213 | St Louis | 09/29/2023 |
| 557-214 | St Louis | 11/13/2023 |
| 557-215 | St Louis | 11/15/2023 |
| 557-216 | St Louis | 06/01/2023 |
| 557-217 | Sappington | 11/15/2023 |
| 557-218 | Ladue | 12/22/2023 |
| 557-219 | Ladue | 01/18/2024 |
| 557-220 | Creve Coeur | 01/23/2024 |
| 557-221 | Mehlville | 04/10/2024 |
| 557-222 | St Louis | 05/04/2023 |
| 557-223 | Ladue | 04/10/2024 |
| 557-224 | Creve Coeur | 12/15/2023 |
| 557-225 | Ladue | 04/10/2024 |
| 557-226 | Creve Coeur | 06/05/2024 |
| 557-227 | Kirkwood | 07/31/2024 |
| 557-228 | St Louis | 11/25/2024 |
| 557-229 | Kirkwood | 11/27/2024 |
| 557-230 | Sappington | 12/30/2024 |
| 557-231 | St Louis | 01/03/2025 |
| 557-232 | Ladue | 02/18/2025 |
| 557-233 | St Louis | 02/25/2025 |
| 557-234 | St Louis | 03/13/2025 |
| 557-235 | Kirkwood | 03/31/2025 |
| 557-236 | Ladue | 04/24/2025 |
| 557-237 | Ladue | 05/23/2025 |
| 557-273 | St Louis | 01/25/2023 |
| 557-362 | St Louis | 01/25/2023 |
| 557-454 | St Louis | 01/25/2023 |
| 557-467 | St Louis | 8/8/2022 |
| 557-500 | St Louis | 8/12/2022 |
| 557-507 | St Louis | 08/16/2023 |
| 557-557 | St Louis | 05/15/2023 |
| 557-567 | Kirkwood | 11/07/2024 |
| 557-653 | St Louis | 01/25/2023 |
| 557-747 | St Louis | 01/25/2023 |
| 557-777 | Creve Coeur | 8/24/2022 |
| 557-888 | Kirkwood | 9/16/2022 |
| 557-953 | St Louis | 01/25/2023 |
| 557-996 | St Louis | 01/25/2023 |
| 557-999 | Sappington | 9/16/2022 |
- For 'Area served' we list the rate center. In the North American Numbering Plan a rate center is a geographic area used to determine local calling boundaries for billing purposes. Its name is generally a locality, often not the only one served by an NPA-NXX combination.
- Assignment date.
- NXX prefixes last updated: June 3, 2025
Cities in area code 557
| City1 | County | Time Zone1 |
|---|---|---|
| Affton | St Louis | C |
| Bridgeton | St Louis | C |
| Creve Coeur | St Louis | C |
| Earth City | St Louis | C |
| Ferguson | St Louis | C |
| Florissant | St Louis | C |
| Glencoe | St Louis | C |
| Hazelwood | St Louis | C |
| Kirkwood | St Louis | C |
| Ladue | St Louis | C |
| Maryland Heights | St Louis | C |
| Mehlville | St Louis | C |
| Oakville | St Louis | C |
| Overland | St Louis | C |
| Sappington | St Louis | C |
| Spanish Lake | St Louis | C |
| St Ann | St Louis | C |
| St Louis | St Louis | C |
| University City | St Louis | C |
| Valley Park | St Louis | C |
| Webster Groves | St Louis | C |
- Listed above are most places served by USA area code 557. When multiple places in a US state share the same name we list the largest one only. Cities with population over 50,000 are displayed in bold text.
- C stands for Central Time (currently ).