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 |
|---|---|---|---|---|---|
| 721 | Fijo | TOTAL PLAY | Tampico | Tamaulipas | Tampico |
| 721 | Fijo | TOTAL PLAY | Tampico | Tamaulipas | Tampico |
| 722 | Fijo | TOTAL PLAY | Tampico | Tamaulipas | Tampico |
| 722 | Fijo | TOTAL PLAY | Tampico | Tamaulipas | Tampico |
| 723 | Fijo | TELECO NETWORKS | Tampico | Tamaulipas | Tampico |
| 724 | Fijo | ENTRETENIMIENTO Y TELECOMUNICACIONE | Tampico | Tamaulipas | Tampico |
| 725 | Fijo | TOTAL PLAY | Tampico | Tamaulipas | Tampico |
| 725 | Fijo | TOTAL PLAY | Tampico | Tamaulipas | Tampico |
| 726 | Fijo | CABLEVISIONRED | Tampico | Tamaulipas | Tampico |
| 726 | Movil | CABLEVISIONRED | Tampico | Tamaulipas | Tampico |
| 726 | Fijo | CABLEVISIONRED | Tampico | Tamaulipas | Tampico |
| 727 | Fijo | PROCOM | Tampico | Tamaulipas | Tampico |
| 728 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 729 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 729 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 730 | Fijo | TOTAL PLAY | Tampico | Tamaulipas | Tampico |
| 730 | Fijo | TOTAL PLAY | Tampico | Tamaulipas | Tampico |
| 731 | Fijo | TOTAL PLAY | Tampico | Tamaulipas | Tampico |
| 731 | Fijo | TOTAL PLAY | Tampico | Tamaulipas | Tampico |
| 732 | Fijo | INFORMÁTICA ARQUISYSTEMS | Tampico | Tamaulipas | Tampico |
| 733 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 734 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 734 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 735 | Fijo | TOTAL PLAY | Tampico | Tamaulipas | Tampico |
| 735 | Fijo | TOTAL PLAY | Tampico | Tamaulipas | Tampico |
| 736 | Fijo | NEUROTECH | Tampico | Tamaulipas | Tampico |
| 737 | Fijo | TOTAL PLAY | Tampico | Tamaulipas | Tampico |
| 737 | Fijo | TOTAL PLAY | Tampico | Tamaulipas | Tampico |
| 738 | Movil | CABLEVISIONRED | Tampico | Tamaulipas | Tampico |
| 739 | Fijo | TELCOTRADER | Tampico | Tamaulipas | Tampico |
| 740 | Fijo | SANDUR | Tampico | Tamaulipas | Tampico |
| 741 | Fijo | FLYNODE | Tampico | Tamaulipas | Tampico |
| 742 | Fijo | GIRNET | Tampico | Tamaulipas | Tampico |
| 743 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 744 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 745 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 746 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 747 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 747 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 748 | Fijo | CABLEVISIONRED | Tampico | Tamaulipas | Tampico |
| 748 | Movil | CABLEVISIONRED | Tampico | Tamaulipas | Tampico |
| 749 | Fijo | TOTAL PLAY | Tampico | Tamaulipas | Tampico |
| 749 | Fijo | TOTAL PLAY | Tampico | Tamaulipas | Tampico |
| 750 | Movil | CABLEVISIONRED | Tampico | Tamaulipas | Tampico |
| 750 | Fijo | CABLEVISIONRED | Tampico | Tamaulipas | Tampico |
| 751 | Fijo | FOREVERFLOW | Tampico | Tamaulipas | Tampico |
| 752 | Fijo | KARLA_ALICIA | Tampico | Tamaulipas | Tampico |
| 753 | Fijo | ASAL | Tampico | Tamaulipas | Tampico |
| 754 | Fijo | ARDO | Tampico | Tamaulipas | Tampico |
| 755 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 756 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 757 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 758 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 759 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 760 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 761 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 761 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 762 | Fijo | SPARKTELECOMM | Tampico | Tamaulipas | Tampico |
| 762 | Fijo | SPARKTELECOMM | Tampico | Tamaulipas | Tampico |
| 762 | Fijo | SPARKTELECOMM | Tampico | Tamaulipas | Tampico |
| 762 | Fijo | SPARKTELECOMM | Tampico | Tamaulipas | Tampico |
| 763 | Fijo | ROBOT | Tampico | Tamaulipas | Tampico |
| 763 | Fijo | ROBOT | Altamira | Tamaulipas | Altamira |
| 763 | Fijo | ROBOT | Ciudad Madero | Tamaulipas | Ciudad madero |
| 764 | Movil | YONDER | Tampico | Tamaulipas | Tampico |
| 765 | Fijo | ANYNESS | Tampico | Tamaulipas | Tampico |
| 766 | Fijo | SERVICIO DE TELECABLE DE HUEJUTLA | Tampico | Tamaulipas | Tampico |
| 767 | Fijo | CABLEVISIONRED | Tampico | Tamaulipas | Tampico |
| 767 | Fijo | CABLEVISIONRED | Altamira | Tamaulipas | Altamira |
| 768 | Fijo | CABLEVISIONRED | Tampico | Tamaulipas | Tampico |
| 769 | Movil | TALENTO NET | Tampico | Tamaulipas | Tampico |
| 770 | Fijo | IMPULSORA BALDER | Tampico | Tamaulipas | Tampico |
| 771 | Fijo | SPARKTELECOMM | Tampico | Tamaulipas | Tampico |
| 772 | Movil | FREEDOMPOP | Tampico | Tamaulipas | Tampico |
| 773 | Fijo | SPARKTELECOMM | Tampico | Tamaulipas | Tampico |
| 774 | Fijo | TOTAL PLAY | Tampico | Tamaulipas | Tampico |
| 774 | Fijo | TOTAL PLAY | Tampico | Tamaulipas | Tampico |
| 775 | Fijo | MCM | Tampico | Tamaulipas | Tampico |
| 776 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 777 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 778 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 779 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 780 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 781 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 782 | Movil | AT&T | Tampico | Tamaulipas | Tampico |
| 783 | Movil | VIRGIN | Ciudad Madero | Tamaulipas | Ciudad madero |
| 783 | Movil | VIRGIN | Altamira | Tamaulipas | Altamira |
| 783 | Movil | VIRGIN | Tampico | Tamaulipas | Tampico |
| 784 | Fijo | SPARKTELECOMM | Tampico | Tamaulipas | Tampico |
| 785 | Fijo | TOTAL PLAY | Tampico | Tamaulipas | Tampico |
| 786 | Fijo | TOTAL PLAY | Tampico | Tamaulipas | Tampico |
| 787 | Fijo | TOTAL PLAY | Tampico | Tamaulipas | Tampico |
| 788 | Fijo | JAPIFON | Tampico | Tamaulipas | Tampico |
| 789 | Fijo | SPARKTELECOMM | Tampico | Tamaulipas | Tampico |
| 790 | Fijo | DIGITAL COMUNICATIONS | Tampico | Tamaulipas | Tampico |
| 791 | Fijo | TELECOMMERCE HOLDING | Tampico | Tamaulipas | Tampico |
| 792 | Movil | ALTÁN | Tampico | Tamaulipas | Tampico |
| 793 | Movil | ALTÁN | Tampico | Tamaulipas | Tampico |
| 794 | Fijo | SPARKTELECOMM | Tampico | Tamaulipas | Tampico |
| 800 | Fijo | ALESTRA | Tampico | Tamaulipas | Tampico |