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 |
|---|---|---|---|---|---|
| 420 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 421 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 422 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 423 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 424 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 425 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 426 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 427 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 427 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 428 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 429 | Fijo | TOTAL PLAY | Mazatlán | Sinaloa | Mazatlan |
| 430 | Fijo | TOTAL PLAY | Mazatlán | Sinaloa | Mazatlan |
| 431 | Movil | TELCEL | Mazatlán | Sinaloa | Mazatlan |
| 432 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 433 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 434 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 434 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 435 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 436 | Movil | ALTÁN | Mazatlán | Sinaloa | Mazatlan |
| 437 | Movil | ALTÁN | Mazatlán | Sinaloa | Mazatlan |
| 438 | Movil | ALTÁN | Mazatlán | Sinaloa | Mazatlan |
| 439 | Movil | MEGACABLE | Mazatlán | Sinaloa | Villa union |
| 439 | Movil | MEGACABLE | Mazatlán | Sinaloa | Mazatlan |
| 439 | Fijo | MEGACABLE | Mazatlán | Sinaloa | Mazatlan |
| 440 | Fijo | ROBOT | Mazatlán | Sinaloa | Castillo, el |
| 440 | Fijo | ROBOT | Mazatlán | Sinaloa | Mazatlan |
| 440 | Fijo | ROBOT | Mazatlán | Sinaloa | Castillo, el |
| 440 | Fijo | ROBOT | Mazatlán | Sinaloa | Castillo, el |
| 440 | Fijo | ROBOT | Mazatlán | Sinaloa | Mazatlan |
| 440 | Fijo | ROBOT | Mazatlán | Sinaloa | Castillo, el |
| 440 | Fijo | ROBOT | Mazatlán | Sinaloa | Mazatlan |
| 441 | Movil | TELCEL | Mazatlán | Sinaloa | Mazatlan |
| 442 | Fijo | NGX NETWORKS | Mazatlán | Sinaloa | Mazatlan |
| 443 | Fijo | INBTEL | Mazatlán | Sinaloa | Mazatlan |
| 444 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 445 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 446 | Movil | TELCEL | Mazatlán | Sinaloa | Mazatlan |
| 447 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 448 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 449 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 450 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 451 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 452 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 453 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 454 | Fijo | BESTPHONE | Mazatlán | Sinaloa | Mazatlan |
| 455 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 455 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 456 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 457 | Fijo | TOTAL PLAY | Mazatlán | Sinaloa | Mazatlan |
| 458 | Fijo | TV CABLE | Mazatlán | Sinaloa | Mazatlan |
| 458 | Fijo | TV CABLE | Mazatlán | Sinaloa | Mazatlan |
| 459 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 460 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 460 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 461 | Fijo | MEGACABLE | Mazatlán | Sinaloa | Mazatlan |
| 461 | Fijo | MEGACABLE | Mazatlán | Sinaloa | Mazatlan |
| 462 | Fijo | NEUROTECH | Mazatlán | Sinaloa | Mazatlan |
| 463 | Fijo | LAYER7 | Mazatlán | Sinaloa | Mazatlan |
| 464 | Fijo | FLYNODE | Mazatlán | Sinaloa | Mazatlan |
| 465 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 466 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 467 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 468 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 469 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 469 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 470 | Fijo | MEGACABLE | Mazatlán | Sinaloa | Mazatlan |
| 471 | Movil | CABLEVISIONRED | Mazatlán | Sinaloa | Mazatlan |
| 472 | Fijo | TV CABLE | Mazatlán | Sinaloa | Mazatlan |
| 472 | Fijo | TV CABLE | Mazatlán | Sinaloa | Mazatlan |
| 473 | Movil | ALTÁN | Mazatlán | Sinaloa | Mazatlan |
| 474 | Movil | ALTÁN | Mazatlán | Sinaloa | Mazatlan |
| 475 | Movil | ALTÁN | Mazatlán | Sinaloa | Mazatlan |
| 476 | Movil | ALTÁN | Mazatlán | Sinaloa | Mazatlan |
| 477 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 478 | Fijo | ALESTRA | Mazatlán | Sinaloa | Mazatlan |
| 479 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 480 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 481 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 482 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 483 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 484 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 484 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 485 | Fijo | TELECOMMERCE | Mazatlán | Sinaloa | Mazatlan |
| 486 | Fijo | ARDO | Mazatlán | Sinaloa | Mazatlan |
| 487 | Fijo | SPARKTELECOMM | Mazatlán | Sinaloa | Mazatlan |
| 487 | Fijo | SPARKTELECOMM | Mazatlán | Sinaloa | Mazatlan |
| 487 | Fijo | SPARKTELECOMM | Mazatlán | Sinaloa | Mazatlan |
| 487 | Fijo | SPARKTELECOMM | Mazatlán | Sinaloa | Mazatlan |
| 488 | Fijo | TELMEX | Mazatlán | Sinaloa | Mazatlan |
| 488 | Fijo | TELMEX | Mazatlán | Sinaloa | Bajio, el |
| 488 | Fijo | TELMEX | Mazatlán | Sinaloa | Zapote, el |
| 489 | Movil | YONDER | Mazatlán | Sinaloa | Mazatlan |
| 490 | Fijo | SERVNET | Mazatlán | Sinaloa | Zapote, el |
| 491 | Fijo | SPARKTELECOMM | Mazatlán | Sinaloa | Mazatlan |
| 492 | Movil | FREEDOMPOP | Mazatlán | Sinaloa | Mazatlan |
| 493 | Fijo | SPARKTELECOMM | Mazatlán | Sinaloa | Mazatlan |
| 494 | Fijo | TV CABLE | Mazatlán | Sinaloa | Mazatlan |
| 495 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 496 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |
| 497 | Movil | AT&T | Mazatlán | Sinaloa | Mazatlan |