Missouri, United States
Central Time
6:31 PM
Area Code
557
State / Province
Missouri
Country
United States
Time Zone
Central Time
Area code 557 covers 7 cities and communities across Missouri, based on telephone company rate center data.
Use the E.164 format for clickable phone links (RFC 3966):
<a href="tel:+15575550100">+15575550100</a><a href="tel:+15575550199">+15575550199</a>Look up which exchange in Missouri a specific 557 number is homed to, and whether its block is wireline or wireless. See what a reverse lookup can establish before relying on the answer.
80 active prefixes in this area code, assigned as 833 thousands-blocks — pooling splits one prefix across several carriers, so each block is listed separately with the rate centre it is homed to, its carrier of record, and the switch that serves it.
Showing blocks 1–100 of 833
| NPA-NXX | Block | Rate centre | Type | Carrier (OCN) | Switch | LATA | LIR | Dates |
|---|---|---|---|---|---|---|---|---|
| 557-200 | 0 | Ladue | Landline or VoIP | TELNYX LLC (073H) | STLSMOWQ8MD | 520 | — | — |
| 557-200 | 1 | Ladue | Wireless | NEW CINGULAR WIRELESS PCS, LLC - IL (6534) | NWTPMOABGT1 | 520 | — | — |
| 557-200 | 2 | Ladue | Wireless | NEW CINGULAR WIRELESS PCS, LLC - IL (6534) | NWTPMOABGT1 | 520 | — | — |
| 557-200 | 3 | Ladue | Landline or VoIP | ONVOY, LLC - MO (093F) | ST LOUIS | 520 | — | — |
| 557-200 | 4 | Ladue | Landline or VoIP | ONVOY, LLC - MO (093F) | ST LOUIS | 520 | — | — |
| 557-200 | 5 | Ladue | Landline or VoIP | ONVOY, LLC - MO (093F) | ST LOUIS | 520 | — | — |
| 557-200 | 6 | Ladue | Landline or VoIP | ONVOY, LLC - MO (093F) | ST LOUIS | 520 | — | — |
| 557-200 | 7 | Ladue | Landline or VoIP | ONVOY, LLC - MO (093F) | ST LOUIS | 520 | — | — |
| 557-200 | 8 | Ladue | Landline or VoIP | ONVOY, LLC - MO (093F) | ST LOUIS | 520 | — | — |
| 557-200 | 9 | Ladue | Wireless | NEW CINGULAR WIRELESS PCS, LLC - IL (6534) | NWTPMOABGT1 | 520 | — | — |
| 557-200 | A | Ladue | Landline or VoIP | ONVOY, LLC - MO (093F) | ST LOUIS | 520 | — | — |
| 557-201 | 0 | Kirkwood | Landline or VoIP | TELNYX LLC (073H) | STLSMOWQ8MD | 520 | — | — |
| 557-201 | 1 | Kirkwood | Landline or VoIP | ONVOY, LLC - MO (093F) | ST LOUIS | 520 | — | — |
| 557-201 | 2 | Kirkwood | Landline or VoIP | ONVOY, LLC - MO (093F) | ST LOUIS | 520 | — | — |
| 557-201 | 3 | Kirkwood | Landline or VoIP | ONVOY, LLC - MO (093F) | ST LOUIS | 520 | — | — |
| 557-201 | 4 | Kirkwood | Landline or VoIP | ONVOY, LLC - MO (093F) | ST LOUIS | 520 | — | — |
| 557-201 | 5 | Kirkwood | Landline or VoIP | ONVOY, LLC - MO (093F) | ST LOUIS | 520 | — | — |
| 557-201 | 6 | Kirkwood | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MO (7218) | STLSMO09XMD | 520 | — | — |
| 557-201 | 7 | Kirkwood | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MO (7218) | STLSMO09XMD | 520 | — | — |
| 557-201 | 8 | Kirkwood | Landline or VoIP | ONVOY, LLC - MO (093F) | ST LOUIS | 520 | — | — |
| 557-201 | 9 | Kirkwood | Landline or VoIP | ONVOY, LLC - MO (093F) | ST LOUIS | 520 | — | — |
| 557-201 | A | Kirkwood | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MO (7218) | STLSMO09XMD | 520 | — | — |
| 557-202 | 0 | St Louis | Landline or VoIP | ONVOY, LLC - MO (093F) | ST LOUIS | 520 | — | — |
| 557-202 | 1 | St Louis | Landline or VoIP | COMCAST IP PHONE, LLC (318J) | STLSMO05XWX | 520 | — | — |
| 557-202 | 2 | St Louis | Wireless | NEW CINGULAR WIRELESS PCS, LLC - IL (6534) | NWTPMOABGT1 | 520 | — | — |
| 557-202 | 3 | St Louis | Landline or VoIP | ONVOY, LLC - MO (093F) | STLSMO05XLX | 520 | — | — |
| 557-202 | 4 | St Louis | Landline or VoIP | ONVOY, LLC - MO (093F) | STLSMO05XLX | 520 | — | — |
| 557-202 | 5 | St Louis | Landline or VoIP | ONVOY, LLC - MO (093F) | STLSMO05XLX | 520 | — | — |
| 557-202 | 6 | St Louis | Landline or VoIP | ONVOY, LLC - MO (093F) | ST LOUIS | 520 | — | — |
| 557-202 | 7 | St Louis | Landline or VoIP | ONVOY, LLC - MO (093F) | ST LOUIS | 520 | — | — |
| 557-202 | 8 | St Louis | Wireless | BOOST SUBSCRIBERCO L.L.C. (490J) | STLSMOGZLMD | 520 | — | — |
| 557-202 | 9 | St Louis | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MO (7218) | STLSMO09XMD | 520 | — | — |
| 557-202 | A | St Louis | Landline or VoIP | COMCAST IP PHONE, LLC (318J) | STLSMO05XWX | 520 | — | — |
| 557-203 | 0 | Mehlville | Landline or VoIP | ONVOY, LLC - MO (093F) | ST LOUIS | 520 | — | — |
| 557-203 | 1 | Mehlville | Landline or VoIP | ONVOY, LLC - MO (093F) | ST LOUIS | 520 | — | — |
| 557-203 | 2 | Mehlville | Landline or VoIP | ONVOY, LLC - MO (093F) | ST LOUIS | 520 | — | — |
| 557-203 | 3 | Mehlville | Landline or VoIP | ONVOY, LLC - MO (093F) | ST LOUIS | 520 | — | — |
| 557-203 | 4 | Mehlville | Landline or VoIP | ONVOY, LLC - MO (093F) | ST LOUIS | 520 | — | — |
| 557-203 | 5 | Mehlville | Landline or VoIP | ONVOY, LLC - MO (093F) | ST LOUIS | 520 | — | — |
| 557-203 | 6 | Mehlville | Wireless | NEW CINGULAR WIRELESS PCS, LLC - IL (6534) | NWTPMOABGT1 | 520 | — | — |
| 557-203 | 7 | Mehlville | Wireless | T-MOBILE USA, INC. (6529) | STLVMOOH6MD | 520 | — | — |
| 557-203 | 8 | Mehlville | Wireless | T-MOBILE USA, INC. (6529) | STLVMOOH6MD | 520 | — | — |
| 557-203 | 9 | Mehlville | Landline or VoIP | TERRA NOVA TELECOM INC. (145J) | STLSMOGZEMD | 520 | — | — |
| 557-203 | A | Mehlville | Wireless | T-MOBILE USA, INC. (6529) | STLVMOOH6MD | 520 | — | — |
| 557-204 | 0 | St Louis | Landline or VoIP | FIVE9, INC. (598J) | STLSMOGZUMD | 520 | — | — |
| 557-204 | 1 | St Louis | Landline or VoIP | ONVOY, LLC - MO (093F) | ST LOUIS | 520 | — | — |
| 557-204 | 2 | St Louis | Wireless | NEW CINGULAR WIRELESS PCS, LLC - IL (6534) | NWTPMOABGT1 | 520 | — | — |
| 557-204 | 3 | St Louis | Landline or VoIP | VONAGE AMERICA LLC (197D) | STLSMOPL5MD | 520 | — | — |
| 557-204 | 4 | St Louis | Wireless | BOOST SUBSCRIBERCO L.L.C. (490J) | STLSMOGZLMD | 520 | — | — |
| 557-204 | 5 | St Louis | Wireless | NEW CINGULAR WIRELESS PCS, LLC - IL (6534) | NWTPMOABGT1 | 520 | — | — |
| 557-204 | 6 | St Louis | Landline or VoIP | TELNYX LLC (073H) | STLSMOWQ8MD | 520 | — | — |
| 557-204 | 7 | St Louis | Landline or VoIP | TELNYX LLC (073H) | STLSMOWQ8MD | 520 | — | — |
| 557-204 | 8 | St Louis | Landline or VoIP | ONVOY, LLC - MO (093F) | ST LOUIS | 520 | — | — |
| 557-204 | 9 | St Louis | Wireless | NEW CINGULAR WIRELESS PCS, LLC - IL (6534) | NWTPMOABGT1 | 520 | — | — |
| 557-204 | A | St Louis | Landline or VoIP | FIVE9, INC. (598J) | STLSMOGZUMD | 520 | — | — |
| 557-205 | 0 | St Louis | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MO (7218) | STLSMO09XMD | 520 | — | — |
| 557-205 | 1 | St Louis | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MO (7218) | STLSMO09XMD | 520 | — | — |
| 557-205 | 2 | St Louis | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MO (7218) | STLSMO09XMD | 520 | — | — |
| 557-205 | 3 | St Louis | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MO (7218) | STLSMO09XMD | 520 | — | — |
| 557-205 | 4 | St Louis | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MO (7218) | STLSMO09XMD | 520 | — | — |
| 557-205 | 5 | St Louis | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MO (7218) | STLSMO09XMD | 520 | — | — |
| 557-205 | 6 | St Louis | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MO (7218) | STLSMO09XMD | 520 | — | — |
| 557-205 | 7 | St Louis | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MO (7218) | STLSMO09XMD | 520 | — | — |
| 557-205 | 8 | St Louis | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MO (7218) | STLSMO09XMD | 520 | — | — |
| 557-205 | 9 | St Louis | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MO (7218) | STLSMO09XMD | 520 | — | — |
| 557-205 | A | St Louis | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MO (7218) | STLSMO09XMD | 520 | — | — |
| 557-206 | 0 | St Louis | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MO (7218) | STLSMO09XMD | 520 | — | — |
| 557-206 | 1 | St Louis | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MO (7218) | STLSMO09XMD | 520 | — | — |
| 557-206 | 2 | St Louis | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MO (7218) | STLSMO09XMD | 520 | — | — |
| 557-206 | 3 | St Louis | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MO (7218) | STLSMO09XMD | 520 | — | — |
| 557-206 | 4 | St Louis | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MO (7218) | STLSMO09XMD | 520 | — | — |
| 557-206 | 5 | St Louis | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MO (7218) | STLSMO09XMD | 520 | — | — |
| 557-206 | 6 | St Louis | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MO (7218) | STLSMO09XMD | 520 | — | — |
| 557-206 | 7 | St Louis | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MO (7218) | STLSMO09XMD | 520 | — | — |
| 557-206 | 8 | St Louis | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MO (7218) | STLSMO09XMD | 520 | — | — |
| 557-206 | 9 | St Louis | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MO (7218) | STLSMO09XMD | 520 | — | — |
| 557-206 | A | St Louis | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MO (7218) | STLSMO09XMD | 520 | — | — |
| 557-207 | 0 | Oakville | Landline or VoIP | FIVE9, INC. (598J) | STLSMOGZVMD | 520 | — | — |
| 557-207 | 1 | Oakville | Landline or VoIP | ONVOY, LLC - MO (093F) | ST LOUIS | 520 | — | — |
| 557-207 | 2 | Oakville | Landline or VoIP | ONVOY, LLC - MO (093F) | ST LOUIS | 520 | — | — |
| 557-207 | 3 | Oakville | Landline or VoIP | ONVOY, LLC - MO (093F) | ST LOUIS | 520 | — | — |
| 557-207 | 4 | Oakville | Landline or VoIP | ONVOY, LLC - MO (093F) | ST LOUIS | 520 | — | — |
| 557-207 | 5 | Oakville | Landline or VoIP | ONVOY, LLC - MO (093F) | ST LOUIS | 520 | — | — |
| 557-207 | 6 | Oakville | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MO (7218) | STLSMO09XMD | 520 | — | — |
| 557-207 | 7 | Oakville | Landline or VoIP | ONVOY, LLC - MO (093F) | ST LOUIS | 520 | — | — |
| 557-207 | 8 | Oakville | Landline or VoIP | ONVOY, LLC - MO (093F) | ST LOUIS | 520 | — | — |
| 557-207 | 9 | Oakville | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - MO (993E) | STLSMO05RMD | 520 | — | — |
| 557-207 | A | Oakville | Landline or VoIP | FIVE9, INC. (598J) | STLSMOGZVMD | 520 | — | — |
| 557-208 | 0 | Ladue | Wireless | NEW CINGULAR WIRELESS PCS, LLC - IL (6534) | NWTPMOABGT1 | 520 | — | — |
| 557-208 | 1 | Ladue | Wireless | NEW CINGULAR WIRELESS PCS, LLC - IL (6534) | NWTPMOABGT1 | 520 | — | — |
| 557-208 | 2 | Ladue | Landline or VoIP | ONVOY, LLC - MO (093F) | ST LOUIS | 520 | — | — |
| 557-208 | 3 | Ladue | Landline or VoIP | ONVOY, LLC - MO (093F) | ST LOUIS | 520 | — | — |
| 557-208 | 4 | Ladue | Landline or VoIP | ONVOY, LLC - MO (093F) | ST LOUIS | 520 | — | — |
| 557-208 | 5 | Ladue | Landline or VoIP | ONVOY, LLC - MO (093F) | ST LOUIS | 520 | — | — |
| 557-208 | 6 | Ladue | Wireless | ONVOY SPECTRUM, LLC (624H) | STLSMO05XMX | 520 | — | — |
| 557-208 | 7 | Ladue | Wireless | ONVOY SPECTRUM, LLC (624H) | STLSMO05XMX | 520 | — | — |
| 557-208 | 8 | Ladue | Wireless | ONVOY SPECTRUM, LLC (624H) | STLSMO05XMX | 520 | — | — |
| 557-208 | 9 | Ladue | Wireless | ONVOY SPECTRUM, LLC (624H) | STLSMO05XMX | 520 | — | — |
| 557-208 | A | Ladue | Landline or VoIP | ONVOY, LLC - MO (093F) | ST LOUIS | 520 | — | — |
| 557-209 | 0 | Kirkwood | Landline or VoIP | ONVOY, LLC - MO (093F) | ST LOUIS | 520 | — | — |
Block-level assignments from the North American Numbering Plan administrator, via localcallingguide.com.
Assigned Prefixes
80
Assignment Blocks
833
Rate Centers
7
Carriers of Record
25
| Type | Blocks | Share |
|---|---|---|
| Landline or VoIP | 461 | 55% |
| Wireless | 372 | 45% |
| Carrier | Blocks |
|---|---|
| NEW CINGULAR WIRELESS PCS, LLC - IL | 271 |
| ONVOY, LLC - MO | 243 |
| TELEPORT COMMUNICATIONS AMERICA, LLC - MO | 155 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO | 53 |
| ONVOY SPECTRUM, LLC | 25 |
| BOOST SUBSCRIBERCO L.L.C. | 17 |
| BANDWIDTH.COM CLEC, LLC - MO | 13 |
| NUSO, LLC | 9 |
| HD CARRIER LLC | 5 |
| T-MOBILE USA, INC. | 5 |
| 15 other carriers | 37 |
Carrier of record for each block. Numbers ported to another carrier keep their original block assignment, so this is not a lookup of who serves a given number today.
| Rate Center | Prefixes | Blocks |
|---|---|---|
| St Louis | 34 | 357 |
| Ladue | 16 | 176 |
| Kirkwood | 12 | 132 |
| Creve Coeur | 6 | 59 |
| Mehlville | 5 | 50 |
| Sappington | 5 | 46 |
| Oakville | 2 | 13 |
A rate center is the telephone exchange area a number is homed to. It sets local calling boundaries, and is not the caller's current location.
Area code 557 is a North American Numbering Plan (NANP) telephone area code assigned to Missouri, United States. It is one of 9 area codes serving Missouri. As population and demand for phone numbers grew, the region was divided into multiple numbering plan areas to avoid exhausting the available 7-digit number pool.
Yes. 557 is an active North American Numbering Plan (NANP) area code, currently assigned to Missouri, United States. It is safe to answer or dial calls using this area code.
Area code 557 covers 7 cities and communities in Missouri, including Creve Coeur, Kirkwood, Ladue, Mehlville, Oakville, and 2 more localities. This is based on telephone company rate center data — the geographic areas carriers use to determine local calling boundaries and to assign numbers when a business or individual requests a phone number in a specific city.
All numbers in the 557 area code observe Central Time (IANA timezone: America/Chicago). Central Time is UTC−6 in winter (CST) and UTC−5 in summer (CDT). When placing a call to a 557 number from a different time zone, check the current local time above to avoid calling outside of business hours.
From within Missouri, dial the 7-digit local number directly if calling within the same rate center, or dial 1 + 557 + 7-digit number for long-distance calls within North America. From outside the US or Canada, dial your country's international exit code followed by 1 557 XXX XXXX. The country code for both the United States and Canada in NANP is +1.
Format 557 numbers using E.164 notation as required by RFC 3966: prefix with +1 and omit dashes and parentheses (e.g., +15575550100). This format ensures tel: links work correctly on all mobile browsers and VoIP apps. See the tel: URI formatting guide for complete examples.