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 | TELCEL | Cortazar | Guanajuato | Cortazar |
| 100 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 101 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 101 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 102 | Movil | MOVISTAR | Cortazar | Guanajuato | Cortazar |
| 102 | Movil | MOVISTAR | Cortazar | Guanajuato | Cortazar |
| 103 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 103 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 103 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 103 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 103 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 104 | Movil | MOVISTAR | Cortazar | Guanajuato | Cortazar |
| 105 | Movil | MOVISTAR | Cortazar | Guanajuato | Cortazar |
| 106 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 106 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 106 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 107 | Fijo | TELMEX | Cortazar | Guanajuato | Cortazar |
| 107 | Fijo | TELMEX | Villagrán | Guanajuato | Villagran |
| 108 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 108 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 108 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 108 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 108 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 109 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 109 | Movil | AT&T | Yuriria | Guanajuato | Calera, la (el canario) |
| 110 | Movil | AT&T | Yuriria | Guanajuato | Calera, la (el canario) |
| 110 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 111 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 112 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 113 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 114 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 114 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 114 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 115 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 115 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 115 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 116 | Movil | MOVISTAR | Cortazar | Guanajuato | Cortazar |
| 117 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 118 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 118 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 118 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 118 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 118 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 118 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 119 | Fijo | TELMEX | Cortazar | Guanajuato | Cortazar |
| 119 | Fijo | TELMEX | Cortazar | Guanajuato | Cañada de caracheo |
| 119 | Fijo | TELMEX | Cortazar | Guanajuato | Cortazar |
| 120 | Fijo | TOTAL PLAY | Cortazar | Guanajuato | Cortazar |
| 120 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 121 | Movil | MOVISTAR | Cortazar | Guanajuato | Cortazar |
| 122 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 122 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 123 | Movil | MOVISTAR | Cortazar | Guanajuato | Cortazar |
| 124 | Movil | MOVISTAR | Cortazar | Guanajuato | Cortazar |
| 125 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 126 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 126 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 127 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 127 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 127 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 128 | Fijo | MOVISTAR | Cortazar | Guanajuato | Cortazar |
| 129 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 130 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 130 | Movil | AT&T | Yuriria | Guanajuato | Calera, la (el canario) |
| 130 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 131 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 131 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 132 | Movil | MOVISTAR | Cortazar | Guanajuato | Cortazar |
| 132 | Movil | MOVISTAR | Cortazar | Guanajuato | Cortazar |
| 133 | Movil | MOVISTAR | Cortazar | Guanajuato | Cortazar |
| 133 | Movil | MOVISTAR | Cortazar | Guanajuato | Cortazar |
| 134 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 134 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 135 | Movil | MOVISTAR | Cortazar | Guanajuato | Cortazar |
| 136 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 136 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 137 | Movil | CELMAX | Cortazar | Guanajuato | Cortazar |
| 137 | Movil | CELMAX | Cortazar | Guanajuato | Cortazar |
| 138 | Fijo | TOTAL PLAY | Cortazar | Guanajuato | Cortazar |
| 139 | Fijo | TV REY | Cortazar | Guanajuato | Cortazar |
| 140 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 140 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 141 | Movil | MOVISTAR | Cortazar | Guanajuato | Cortazar |
| 142 | Movil | MOVISTAR | Cortazar | Guanajuato | Cortazar |
| 142 | Movil | MOVISTAR | Cortazar | Guanajuato | Cortazar |
| 143 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 144 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 145 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 145 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 146 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 146 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 147 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 147 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 148 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 149 | Movil | QBOCEL | Cortazar | Guanajuato | Cortazar |
| 150 | Fijo | BESTPHONE | Cortazar | Guanajuato | Cortazar |
| 151 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 151 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 152 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 152 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |