A PO BOX number can be less than or more than four digit. For post office boxes, the general rule is that each box has its own ZIP+4 code.
The last four digit is often one of the following:
1. Zero plus the last three digits of the box number (eg. PO BOX 1001, Los Angeles CA 90001-0001).
2. The last four digits of the box number (eg. PO BOX 9991, Twin Peaks CA 92391-9991).
3. If the box number is less than four digits, enough zeros prepended to the front of the box number to produce a four-digit number(eg. PO BOX 1, Shreveport LA 71161-0001).
However, there is no uniform rule, the zip code plus four is for reference only, the ZIP+4 code must be looked up individually for each box in the USPS offical website.
PO BOX 691, MAYAGUEZ, PR 00681-0691
PO BOX 692, MAYAGUEZ, PR 00681-0692
PO BOX 693, MAYAGUEZ, PR 00681-0693
PO BOX 694, MAYAGUEZ, PR 00681-0694
PO BOX 695, MAYAGUEZ, PR 00681-0695
PO BOX 696, MAYAGUEZ, PR 00681-0696
PO BOX 697, MAYAGUEZ, PR 00681-0697
PO BOX 698, MAYAGUEZ, PR 00681-0698
PO BOX 699, MAYAGUEZ, PR 00681-0699
PO BOX 700, MAYAGUEZ, PR 00681-0700
PO BOX 701, MAYAGUEZ, PR 00681-0701
PO BOX 702, MAYAGUEZ, PR 00681-0702
PO BOX 703, MAYAGUEZ, PR 00681-0703
PO BOX 704, MAYAGUEZ, PR 00681-0704
PO BOX 705, MAYAGUEZ, PR 00681-0705
PO BOX 706, MAYAGUEZ, PR 00681-0706
PO BOX 707, MAYAGUEZ, PR 00681-0707
PO BOX 708, MAYAGUEZ, PR 00681-0708
PO BOX 709, MAYAGUEZ, PR 00681-0709
PO BOX 710, MAYAGUEZ, PR 00681-0710
PO BOX 711, MAYAGUEZ, PR 00681-0711
PO BOX 712, MAYAGUEZ, PR 00681-0712
PO BOX 713, MAYAGUEZ, PR 00681-0713
PO BOX 714, MAYAGUEZ, PR 00681-0714
PO BOX 715, MAYAGUEZ, PR 00681-0715
PO BOX 716, MAYAGUEZ, PR 00681-0716
PO BOX 717, MAYAGUEZ, PR 00681-0717
PO BOX 718, MAYAGUEZ, PR 00681-0718
PO BOX 719, MAYAGUEZ, PR 00681-0719
PO BOX 720, MAYAGUEZ, PR 00681-0720
PO BOX 721, MAYAGUEZ, PR 00681-0721
PO BOX 722, MAYAGUEZ, PR 00681-0722
PO BOX 723, MAYAGUEZ, PR 00681-0723
PO BOX 724, MAYAGUEZ, PR 00681-0724
PO BOX 725, MAYAGUEZ, PR 00681-0725
PO BOX 726, MAYAGUEZ, PR 00681-0726
PO BOX 727, MAYAGUEZ, PR 00681-0727
PO BOX 728, MAYAGUEZ, PR 00681-0728
PO BOX 729, MAYAGUEZ, PR 00681-0729
PO BOX 730, MAYAGUEZ, PR 00681-0730
PO BOX 731, MAYAGUEZ, PR 00681-0731
PO BOX 732, MAYAGUEZ, PR 00681-0732
PO BOX 733, MAYAGUEZ, PR 00681-0733
PO BOX 734, MAYAGUEZ, PR 00681-0734
PO BOX 735, MAYAGUEZ, PR 00681-0735
PO BOX 736, MAYAGUEZ, PR 00681-0736
PO BOX 737, MAYAGUEZ, PR 00681-0737
PO BOX 738, MAYAGUEZ, PR 00681-0738
PO BOX 739, MAYAGUEZ, PR 00681-0739
PO BOX 740, MAYAGUEZ, PR 00681-0740
PO BOX 741, MAYAGUEZ, PR 00681-0741
PO BOX 742, MAYAGUEZ, PR 00681-0742
PO BOX 743, MAYAGUEZ, PR 00681-0743
PO BOX 744, MAYAGUEZ, PR 00681-0744
PO BOX 745, MAYAGUEZ, PR 00681-0745
PO BOX 746, MAYAGUEZ, PR 00681-0746
PO BOX 747, MAYAGUEZ, PR 00681-0747
PO BOX 748, MAYAGUEZ, PR 00681-0748
PO BOX 749, MAYAGUEZ, PR 00681-0749
PO BOX 750, MAYAGUEZ, PR 00681-0750
PO BOX 751, MAYAGUEZ, PR 00681-0751
PO BOX 752, MAYAGUEZ, PR 00681-0752
PO BOX 753, MAYAGUEZ, PR 00681-0753
PO BOX 754, MAYAGUEZ, PR 00681-0754
PO BOX 755, MAYAGUEZ, PR 00681-0755
PO BOX 756, MAYAGUEZ, PR 00681-0756
PO BOX 757, MAYAGUEZ, PR 00681-0757
PO BOX 758, MAYAGUEZ, PR 00681-0758
PO BOX 759, MAYAGUEZ, PR 00681-0759
PO BOX 760, MAYAGUEZ, PR 00681-0760
PO BOX 761, MAYAGUEZ, PR 00681-0761
PO BOX 762, MAYAGUEZ, PR 00681-0762
PO BOX 763, MAYAGUEZ, PR 00681-0763
PO BOX 764, MAYAGUEZ, PR 00681-0764
PO BOX 765, MAYAGUEZ, PR 00681-0765
PO BOX 766, MAYAGUEZ, PR 00681-0766
PO BOX 767, MAYAGUEZ, PR 00681-0767
PO BOX 768, MAYAGUEZ, PR 00681-0768
PO BOX 769, MAYAGUEZ, PR 00681-0769
PO BOX 770, MAYAGUEZ, PR 00681-0770
PO BOX 771, MAYAGUEZ, PR 00681-0771
PO BOX 772, MAYAGUEZ, PR 00681-0772
PO BOX 773, MAYAGUEZ, PR 00681-0773
PO BOX 774, MAYAGUEZ, PR 00681-0774
PO BOX 775, MAYAGUEZ, PR 00681-0775
PO BOX 776, MAYAGUEZ, PR 00681-0776
PO BOX 777, MAYAGUEZ, PR 00681-0777
PO BOX 778, MAYAGUEZ, PR 00681-0778
PO BOX 779, MAYAGUEZ, PR 00681-0779
PO BOX 780, MAYAGUEZ, PR 00681-0780
PO BOX 781, MAYAGUEZ, PR 00681-0781
PO BOX 782, MAYAGUEZ, PR 00681-0782
PO BOX 783, MAYAGUEZ, PR 00681-0783
PO BOX 784, MAYAGUEZ, PR 00681-0784
PO BOX 785, MAYAGUEZ, PR 00681-0785
PO BOX 786, MAYAGUEZ, PR 00681-0786
PO BOX 787, MAYAGUEZ, PR 00681-0787
PO BOX 788, MAYAGUEZ, PR 00681-0788
PO BOX 789, MAYAGUEZ, PR 00681-0789
PO BOX 790, MAYAGUEZ, PR 00681-0790
PO BOX 791, MAYAGUEZ, PR 00681-0791
PO BOX 792, MAYAGUEZ, PR 00681-0792
PO BOX 793, MAYAGUEZ, PR 00681-0793
PO BOX 794, MAYAGUEZ, PR 00681-0794
PO BOX 795, MAYAGUEZ, PR 00681-0795
PO BOX 796, MAYAGUEZ, PR 00681-0796
PO BOX 797, MAYAGUEZ, PR 00681-0797
PO BOX 798, MAYAGUEZ, PR 00681-0798
PO BOX 799, MAYAGUEZ, PR 00681-0799
PO BOX 800, MAYAGUEZ, PR 00681-0800
PO BOX 801, MAYAGUEZ, PR 00681-0801
PO BOX 802, MAYAGUEZ, PR 00681-0802
PO BOX 803, MAYAGUEZ, PR 00681-0803
PO BOX 804, MAYAGUEZ, PR 00681-0804
PO BOX 805, MAYAGUEZ, PR 00681-0805
PO BOX 806, MAYAGUEZ, PR 00681-0806
PO BOX 807, MAYAGUEZ, PR 00681-0807
PO BOX 808, MAYAGUEZ, PR 00681-0808
PO BOX 809, MAYAGUEZ, PR 00681-0809
PO BOX 810, MAYAGUEZ, PR 00681-0810
PO BOX 811, MAYAGUEZ, PR 00681-0811
PO BOX 812, MAYAGUEZ, PR 00681-0812
PO BOX 813, MAYAGUEZ, PR 00681-0813
PO BOX 814, MAYAGUEZ, PR 00681-0814
PO BOX 815, MAYAGUEZ, PR 00681-0815
PO BOX 816, MAYAGUEZ, PR 00681-0816
PO BOX 817, MAYAGUEZ, PR 00681-0817
PO BOX 818, MAYAGUEZ, PR 00681-0818
PO BOX 819, MAYAGUEZ, PR 00681-0819
PO BOX 820, MAYAGUEZ, PR 00681-0820
PO BOX 821, MAYAGUEZ, PR 00681-0821
PO BOX 822, MAYAGUEZ, PR 00681-0822
PO BOX 823, MAYAGUEZ, PR 00681-0823
PO BOX 824, MAYAGUEZ, PR 00681-0824
PO BOX 825, MAYAGUEZ, PR 00681-0825
PO BOX 826, MAYAGUEZ, PR 00681-0826
PO BOX 827, MAYAGUEZ, PR 00681-0827
PO BOX 828, MAYAGUEZ, PR 00681-0828
PO BOX 829, MAYAGUEZ, PR 00681-0829
PO BOX 830, MAYAGUEZ, PR 00681-0830
PO BOX 831, MAYAGUEZ, PR 00681-0831
PO BOX 832, MAYAGUEZ, PR 00681-0832
PO BOX 833, MAYAGUEZ, PR 00681-0833
PO BOX 834, MAYAGUEZ, PR 00681-0834
PO BOX 835, MAYAGUEZ, PR 00681-0835
PO BOX 836, MAYAGUEZ, PR 00681-0836
PO BOX 837, MAYAGUEZ, PR 00681-0837
PO BOX 838, MAYAGUEZ, PR 00681-0838
PO BOX 839, MAYAGUEZ, PR 00681-0839
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