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 |
|---|---|---|---|---|---|
| 100 | Movil | MOVISTAR | Saucillo | Chihuahua | Saucillo |
| 100 | Movil | MOVISTAR | Saucillo | Chihuahua | Saucillo |
| 101 | Fijo | DIRECTO | Saucillo | Chihuahua | Saucillo |
| 101 | Fijo | DIRECTO | Saucillo | Chihuahua | Saucillo |
| 102 | Movil | SERVITRON | Saucillo | Chihuahua | Saucillo |
| 103 | Fijo | UC TELECOM | Saucillo | Chihuahua | Saucillo |
| 104 | Fijo | TV REY | Saucillo | Chihuahua | Saucillo |
| 105 | Movil | ALTÁN | Saucillo | Chihuahua | Saucillo |
| 105 | Fijo | ALTÁN | Saucillo | Chihuahua | Saucillo |
| 106 | Fijo | MCM | Saucillo | Chihuahua | Saucillo |
| 107 | Fijo | OPERBES | Saucillo | Chihuahua | Saucillo |
| 108 | Movil | ALTÁN | Saucillo | Chihuahua | Saucillo |
| 109 | Fijo | ROBOT | Saucillo | Chihuahua | Col. carlos a. madrazo (ampl. kilometro 59) |
| 109 | Fijo | ROBOT | Saucillo | Chihuahua | Col. carlos a. madrazo (ampl. kilometro 59) |
| 110 | Movil | VIRGIN | Saucillo | Chihuahua | Saucillo |
| 111 | Fijo | CENTERNEXT | Saucillo | Chihuahua | Saucillo |
| 112 | Fijo | INBTEL | Saucillo | Chihuahua | Saucillo |
| 113 | Fijo | TELIGENTIA | Saucillo | Chihuahua | Saucillo |
| 296 | Movil | TELCEL | Saucillo | Chihuahua | Saucillo |
| 296 | Movil | TELCEL | Saucillo | Chihuahua | Saucillo |
| 296 | Movil | TELCEL | Saucillo | Chihuahua | Saucillo |
| 296 | Movil | TELCEL | Saucillo | Chihuahua | Saucillo |
| 296 | Movil | TELCEL | Saucillo | Chihuahua | Saucillo |
| 296 | Movil | TELCEL | Saucillo | Chihuahua | Saucillo |
| 296 | Movil | TELCEL | Saucillo | Chihuahua | Saucillo |
| 296 | Movil | TELCEL | Saucillo | Chihuahua | Saucillo |
| 296 | Movil | TELCEL | Saucillo | Chihuahua | Saucillo |
| 475 | Fijo | TELMEX | Saucillo | Chihuahua | Saucillo |
| 475 | Fijo | TELMEX | Saucillo | Chihuahua | Saucillo |
| 475 | Fijo | TELMEX | Saucillo | Chihuahua | Saucillo |
| 475 | Fijo | TELMEX | Saucillo | Chihuahua | Saucillo |
| 475 | Fijo | TELMEX | Saucillo | Chihuahua | Saucillo |
| 475 | Fijo | TELMEX | Saucillo | Chihuahua | Saucillo |
| 475 | Fijo | TELMEX | Saucillo | Chihuahua | Saucillo |
| 475 | Fijo | TELMEX | Saucillo | Chihuahua | Saucillo |
| 476 | Fijo | TELMEX | Saucillo | Chihuahua | Naica |
| 476 | Fijo | TELMEX | Saucillo | Chihuahua | Naica |
| 476 | Fijo | TELMEX | Saucillo | Chihuahua | Naica |
| 476 | Fijo | TELMEX | Saucillo | Chihuahua | Parritas |
| 478 | Fijo | TELMEX | Julimes | Chihuahua | Julimes |
| 478 | Fijo | TELMEX | Julimes | Chihuahua | Julimes |
| 478 | Fijo | TELMEX | Julimes | Chihuahua | Julimes |
| 478 | Fijo | TELMEX | Saucillo | Chihuahua | Santa gertrudis (la hacienda) |
| 478 | Fijo | TELMEX | Saucillo | Chihuahua | Santa gertrudis (la hacienda) |
| 488 | Fijo | TELMEX | Saucillo | Chihuahua | Parritas |
| 596 | Fijo | TELMEX | Saucillo | Chihuahua | Saucillo |
| 688 | Fijo | TELMEX | Saucillo | Chihuahua | Colonia vicente guerrero |
| 688 | Fijo | TELMEX | Saucillo | Chihuahua | Col. carlos a. madrazo (ampl. kilometro 59) |
| 689 | Fijo | TELMEX | Saucillo | Chihuahua | Gomeño, el |
| 690 | Fijo | MEGACABLE | Saucillo | Chihuahua | Saucillo |