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 |
|---|---|---|---|---|---|
| 165 | Fijo | TELMEX | Cortazar | Guanajuato | Cortazar |
| 166 | Fijo | UC TELECOM | Cortazar | Guanajuato | Tierra fria |
| 167 | Fijo | DIRECTO | Jaral del Progreso | Guanajuato | Hacienda de la bolsa (la bolsa) |
| 167 | Fijo | DIRECTO | Jaral del Progreso | Guanajuato | Hacienda de la bolsa (la bolsa) |
| 168 | Fijo | TELMEX | Cortazar | Guanajuato | San isidro culiacan |
| 168 | Fijo | TELMEX | Cortazar | Guanajuato | San isidro culiacan |
| 168 | Fijo | TELMEX | Jaral del Progreso | Guanajuato | Victoria de cortazar |
| 168 | Fijo | TELMEX | Jaral del Progreso | Guanajuato | Victoria de cortazar |
| 168 | Fijo | TELMEX | Jaral del Progreso | Guanajuato | Victoria de cortazar |
| 169 | Movil | SERVITRON | Cortazar | Guanajuato | Cortazar |
| 170 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 171 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 172 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 173 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 174 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 174 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 175 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 176 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 177 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 178 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 178 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 179 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 180 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 181 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 182 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 183 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 184 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 185 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 186 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 187 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 188 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 188 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 189 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 190 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 191 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 192 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 193 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 194 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 194 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 194 | Movil | AT&T | Yuriria | Guanajuato | Calera, la (el canario) |
| 194 | Movil | AT&T | Yuriria | Guanajuato | Calera, la (el canario) |
| 194 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 195 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 196 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 197 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 198 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 198 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 199 | Movil | MOVISTAR | Cortazar | Guanajuato | Cortazar |
| 200 | Movil | MOVISTAR | Cortazar | Guanajuato | Cortazar |
| 201 | Fijo | COEFICIENTE | Villagrán | Guanajuato | Villagran |
| 202 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 203 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 204 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 205 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 206 | Movil | FREEDOMPOP | Cortazar | Guanajuato | Cortazar |
| 206 | Movil | FREEDOMPOP | Cortazar | Guanajuato | Cortazar |
| 207 | Fijo | OPENIP | Cortazar | Guanajuato | Cortazar |
| 207 | Fijo | OPENIP | Cortazar | Guanajuato | Cortazar |
| 207 | Fijo | OPENIP | Cortazar | Guanajuato | Cortazar |
| 208 | Movil | ALTÁN | Cortazar | Guanajuato | Cortazar |
| 208 | Movil | ALTÁN | Cortazar | Guanajuato | Cortazar |
| 209 | Fijo | MEGACABLE | Cortazar | Guanajuato | Cortazar |
| 209 | Fijo | MEGACABLE | Cortazar | Guanajuato | Cortazar |
| 209 | Fijo | MEGACABLE | Cortazar | Guanajuato | Cortazar |
| 209 | Movil | MEGACABLE | Cortazar | Guanajuato | Cortazar |
| 209 | Movil | MEGACABLE | Villagrán | Guanajuato | Villagran |
| 209 | Fijo | MEGACABLE | Cortazar | Guanajuato | Cortazar |
| 210 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 211 | Movil | TELCEL | Cortazar | Guanajuato | Cortazar |
| 212 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 213 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 214 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 215 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 216 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 217 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 218 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 219 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 220 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 221 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 222 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 223 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 224 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 225 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 226 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 227 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 227 | Movil | AT&T | Yuriria | Guanajuato | Calera, la (el canario) |
| 228 | Fijo | ROBOT | Cortazar | Guanajuato | Cortazar |
| 228 | Fijo | ROBOT | Cortazar | Guanajuato | Cortazar |
| 228 | Fijo | ROBOT | Cortazar | Guanajuato | Cortazar |
| 229 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 230 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 231 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 232 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 233 | Fijo | TELIGENTIA | Cortazar | Guanajuato | Cortazar |
| 234 | Movil | AT&T | Yuriria | Guanajuato | Calera, la (el canario) |
| 234 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 235 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 236 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 236 | Movil | AT&T | Cortazar | Guanajuato | Cortazar |
| 237 | Fijo | NEUROTECH | Cortazar | Guanajuato | Cortazar |