La serie son los 4 número siguiente a la lada, los cuales se utilizan para identificar la compañia y el asentamiento al que pertenece el número telefónico.
| Serie | Tipo | Compañia | Municipio | Estado | Asentamiento |
|---|---|---|---|---|---|
| 426 | Movil | TELECOMUNICACIONES 360 | Tampico | Tamaulipas | Tampico |
| 427 | Movil | TELCEL | Tampico | Tamaulipas | Tampico |
| 428 | Movil | TELCEL | Tampico | Tamaulipas | Tampico |
| 429 | Movil | TELCEL | Tampico | Tamaulipas | Tampico |
| 430 | Movil | TELCEL | Tampico | Tamaulipas | Tampico |
| 431 | Movil | TELCEL | Tampico | Tamaulipas | Tampico |
| 431 | Movil | TELCEL | Tampico | Tamaulipas | Tampico |
| 432 | Fijo | BESTPHONE | Tampico | Tamaulipas | Tampico |
| 433 | Movil | IBO CELL | Tampico | Tamaulipas | Tampico |
| 434 | Movil | QBOCEL | Tampico | Tamaulipas | Tampico |
| 435 | Movil | TELCEL | Tampico | Tamaulipas | Tampico |
| 436 | Movil | TELCEL | Tampico | Tamaulipas | Tampico |
| 437 | Movil | TELCEL | Tampico | Tamaulipas | Tampico |
| 438 | Movil | TELCEL | Tampico | Tamaulipas | Tampico |
| 439 | Movil | TELCEL | Tampico | Tamaulipas | Tampico |
| 440 | Movil | TELCEL | Tampico | Tamaulipas | Tampico |
| 441 | Movil | TELCEL | Tampico | Tamaulipas | Tampico |
| 442 | Movil | TELCEL | Tampico | Tamaulipas | Tampico |
| 443 | Movil | TELCEL | Tampico | Tamaulipas | Tampico |
| 444 | Movil | TELCEL | Tampico | Tamaulipas | Tampico |
| 445 | Movil | TELCEL | Tampico | Tamaulipas | Tampico |
| 446 | Movil | TELCEL | Tampico | Tamaulipas | Tampico |
| 447 | Movil | TELCEL | Tampico | Tamaulipas | Tampico |
| 448 | Movil | TELCEL | Tampico | Tamaulipas | Tampico |
| 449 | Movil | TELCEL | Tampico | Tamaulipas | Tampico |
| 450 | Movil | TELCEL | Tampico | Tamaulipas | Tampico |
| 451 | Movil | TELCEL | Tampico | Tamaulipas | Tampico |
| 452 | Movil | TELCEL | Tampico | Tamaulipas | Tampico |
| 453 | Movil | TELCEL | Tampico | Tamaulipas | Tampico |
| 454 | Fijo | BESTPHONE | Tampico | Tamaulipas | Tampico |
| 455 | Fijo | BESTPHONE | Tampico | Tamaulipas | Tampico |
| 456 | Fijo | BESTPHONE | Tampico | Tamaulipas | Tampico |
| 456 | Fijo | BESTPHONE | Tampico | Tamaulipas | Tampico |
| 457 | Fijo | TOTAL PLAY | Tampico | Tamaulipas | Tampico |
| 458 | Fijo | UC TELECOM | Tampico | Tamaulipas | Tampico |
| 458 | Fijo | UC TELECOM | Tampico | Tamaulipas | Tampico |
| 459 | Fijo | CABLEVISIONRED | Tampico | Tamaulipas | Tampico |
| 459 | Fijo | CABLEVISIONRED | Ciudad Madero | Tamaulipas | Ciudad madero |
| 460 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 461 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 461 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 462 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 463 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 463 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 464 | Movil | AT&T | Ciudad Madero | Tamaulipas | Ciudad madero |
| 465 | Movil | MEGA TEL | Tampico | Tamaulipas | Tampico |
| 466 | Fijo | BESTPHONE | Tampico | Tamaulipas | Tampico |
| 467 | Fijo | BESTPHONE | Tampico | Tamaulipas | Tampico |
| 468 | Fijo | BESTPHONE | Tampico | Tamaulipas | Tampico |
| 469 | Fijo | BESTPHONE | Tampico | Tamaulipas | Tampico |
| 469 | Fijo | BESTPHONE | Tampico | Tamaulipas | Tampico |
| 470 | Fijo | DIALOGA | Tampico | Tamaulipas | Tampico |
| 471 | Fijo | CABLEVISIONRED | Tampico | Tamaulipas | Tampico |
| 472 | Fijo | AVANTEL | Tampico | Tamaulipas | Tampico |
| 473 | Fijo | CONVERGIA | Tampico | Tamaulipas | Tampico |
| 473 | Fijo | CONVERGIA | Tampico | Tamaulipas | Tampico |
| 474 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 475 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 475 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 476 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 477 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 477 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 478 | Fijo | ALESTRA | Tampico | Tamaulipas | Tampico |
| 479 | Fijo | BESTPHONE | Tampico | Tamaulipas | Tampico |
| 480 | Fijo | BESTPHONE | Tampico | Tamaulipas | Tampico |
| 481 | Fijo | BESTPHONE | Tampico | Tamaulipas | Tampico |
| 482 | Fijo | BESTPHONE | Tampico | Tamaulipas | Tampico |
| 483 | Fijo | BESTPHONE | Tampico | Tamaulipas | Tampico |
| 484 | Fijo | BESTPHONE | Tampico | Tamaulipas | Tampico |
| 485 | Fijo | BESTPHONE | Tampico | Tamaulipas | Tampico |
| 486 | Fijo | BESTPHONE | Tampico | Tamaulipas | Tampico |
| 486 | Fijo | BESTPHONE | Tampico | Tamaulipas | Tampico |
| 487 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 488 | Fijo | TELMEX | Ciudad Madero | Tamaulipas | Ciudad madero |
| 488 | Fijo | TELMEX | Tampico Alto | Veracruz de Ignacio de la Llave | Llano de bustos |
| 488 | Fijo | TELMEX | Tampico Alto | Veracruz de Ignacio de la Llave | Llano de bustos |
| 489 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 490 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 490 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 491 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 492 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 493 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 493 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 494 | Movil | MOVISTAR | Tampico | Tamaulipas | Tampico |
| 495 | Movil | MOVISTAR | Tampico | Tamaulipas | Tampico |
| 496 | Movil | MOVISTAR | Tampico | Tamaulipas | Tampico |
| 497 | Movil | MOVISTAR | Tampico | Tamaulipas | Tampico |
| 498 | Movil | MOVISTAR | Tampico | Tamaulipas | Tampico |
| 499 | Movil | MOVISTAR | Tampico | Tamaulipas | Tampico |
| 500 | Fijo | ALESTRA | Tampico | Tamaulipas | Tampico |
| 501 | Movil | MOVISTAR | Tampico | Tamaulipas | Tampico |
| 502 | Movil | MOVISTAR | Tampico | Tamaulipas | Tampico |
| 503 | Movil | MOVISTAR | Tampico | Tamaulipas | Tampico |
| 504 | Movil | MOVISTAR | Tampico | Tamaulipas | Tampico |
| 505 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 505 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 506 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 506 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 507 | Movil | ALTÁN | Tampico | Tamaulipas | Tampico |
| 508 | Movil | ALTÁN | Tampico | Tamaulipas | Tampico |