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 |
|---|---|---|---|---|---|
| 181 | Movil | MOVISTAR | Mexicali | Baja California | Mexicali |
| 182 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 183 | Movil | AT&T | Mexicali | Baja California | Mexicali |
| 184 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 185 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 186 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 187 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 188 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 189 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 190 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 191 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 192 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 193 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 194 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 195 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 196 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 197 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 198 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 199 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 200 | Fijo | TELNOR | Mexicali | Baja California | Mexicali |
| 200 | Fijo | TELNOR | Mexicali | Baja California | Mexicali |
| 200 | Fijo | TELNOR | Mexicali | Baja California | Mexicali |
| 200 | Fijo | TELNOR | Mexicali | Baja California | Mexicali |
| 200 | Fijo | TELNOR | Mexicali | Baja California | Mexicali |
| 201 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 202 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 203 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 204 | Movil | MOVISTAR | Mexicali | Baja California | Mexicali |
| 205 | Movil | MOVISTAR | Mexicali | Baja California | Mexicali |
| 206 | Movil | MOVISTAR | Mexicali | Baja California | Mexicali |
| 207 | Movil | MOVISTAR | Mexicali | Baja California | Mexicali |
| 208 | Movil | MOVISTAR | Mexicali | Baja California | Mexicali |
| 208 | Movil | MOVISTAR | Mexicali | Baja California | Mexicali |
| 208 | Movil | MOVISTAR | Mexicali | Baja California | Mexicali |
| 209 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 210 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 211 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 212 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 213 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 214 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 215 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 216 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 217 | Fijo | STARTEL | Mexicali | Baja California | Mexicali |
| 217 | Fijo | STARTEL | Mexicali | Baja California | San felipe |
| 218 | Fijo | AXTEL | Mexicali | Baja California | Mexicali |
| 219 | Fijo | AXTEL | Mexicali | Baja California | Mexicali |
| 220 | Fijo | AXTEL | Mexicali | Baja California | Mexicali |
| 221 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 222 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 223 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 224 | Movil | AT&T | Mexicali | Baja California | Mexicali |
| 224 | Movil | AT&T | Mexicali | Baja California | Mexicali |
| 224 | Movil | AT&T | Mexicali | Baja California | Mexicali |
| 225 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 226 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 227 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 228 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 229 | Movil | AT&T | Mexicali | Baja California | Mexicali |
| 230 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 231 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 232 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 233 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 234 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 235 | Movil | AT&T | Mexicali | Baja California | Mexicali |
| 236 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 237 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 238 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 239 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 240 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 241 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 242 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 242 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 243 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 244 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 245 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 246 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 247 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 248 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 248 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 249 | Movil | AT&T | Mexicali | Baja California | Mexicali |
| 250 | Movil | AT&T | Mexicali | Baja California | Mexicali |
| 251 | Fijo | CABLEMAS | Mexicali | Baja California | Mexicali |
| 252 | Fijo | CABLEMAS | Mexicali | Baja California | Mexicali |
| 253 | Fijo | CABLEMAS | Mexicali | Baja California | Mexicali |
| 254 | Movil | AT&T | Mexicali | Baja California | Mexicali |
| 254 | Movil | AT&T | Mexicali | Baja California | Mexicali |
| 255 | Movil | MOVISTAR | Mexicali | Baja California | Mexicali |
| 256 | Movil | MOVISTAR | Mexicali | Baja California | Mexicali |
| 257 | Movil | MOVISTAR | Mexicali | Baja California | Mexicali |
| 258 | Movil | MOVISTAR | Mexicali | Baja California | Mexicali |
| 259 | Movil | MOVISTAR | Mexicali | Baja California | Mexicali |
| 260 | Movil | MOVISTAR | Mexicali | Baja California | Mexicali |
| 261 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 262 | Movil | TELCEL | Mexicali | Baja California | Mexicali |
| 263 | Movil | MOVISTAR | Mexicali | Baja California | Mexicali |
| 264 | Movil | MOVISTAR | Mexicali | Baja California | Mexicali |
| 265 | Movil | MOVISTAR | Mexicali | Baja California | Mexicali |
| 266 | Movil | MOVISTAR | Mexicali | Baja California | Mexicali |
| 267 | Movil | MOVISTAR | Mexicali | Baja California | Mexicali |
| 268 | Movil | MOVISTAR | Mexicali | Baja California | Mexicali |