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 751, CARLSBAD, NM 88221-0751
PO BOX 752, CARLSBAD, NM 88221-0752
PO BOX 753, CARLSBAD, NM 88221-0753
PO BOX 754, CARLSBAD, NM 88221-0754
PO BOX 755, CARLSBAD, NM 88221-0755
PO BOX 756, CARLSBAD, NM 88221-0756
PO BOX 757, CARLSBAD, NM 88221-0757
PO BOX 758, CARLSBAD, NM 88221-0758
PO BOX 759, CARLSBAD, NM 88221-0759
PO BOX 760, CARLSBAD, NM 88221-0760
PO BOX 761, CARLSBAD, NM 88221-0761
PO BOX 762, CARLSBAD, NM 88221-0762
PO BOX 763, CARLSBAD, NM 88221-0763
PO BOX 764, CARLSBAD, NM 88221-0764
PO BOX 765, CARLSBAD, NM 88221-0765
PO BOX 766, CARLSBAD, NM 88221-0766
PO BOX 767, CARLSBAD, NM 88221-0767
PO BOX 768, CARLSBAD, NM 88221-0768
PO BOX 769, CARLSBAD, NM 88221-0769
PO BOX 770, CARLSBAD, NM 88221-0770
PO BOX 771, CARLSBAD, NM 88221-0771
PO BOX 772, CARLSBAD, NM 88221-0772
PO BOX 773, CARLSBAD, NM 88221-0773
PO BOX 774, CARLSBAD, NM 88221-0774
PO BOX 775, CARLSBAD, NM 88221-0775
PO BOX 776, CARLSBAD, NM 88221-0776
PO BOX 777, CARLSBAD, NM 88221-0777
PO BOX 778, CARLSBAD, NM 88221-0778
PO BOX 779, CARLSBAD, NM 88221-0779
PO BOX 780, CARLSBAD, NM 88221-0780
PO BOX 781, CARLSBAD, NM 88221-0781
PO BOX 782, CARLSBAD, NM 88221-0782
PO BOX 783, CARLSBAD, NM 88221-0783
PO BOX 784, CARLSBAD, NM 88221-0784
PO BOX 785, CARLSBAD, NM 88221-0785
PO BOX 786, CARLSBAD, NM 88221-0786
PO BOX 787, CARLSBAD, NM 88221-0787
PO BOX 788, CARLSBAD, NM 88221-0788
PO BOX 789, CARLSBAD, NM 88221-0789
PO BOX 790, CARLSBAD, NM 88221-0790
PO BOX 791, CARLSBAD, NM 88221-0791
PO BOX 792, CARLSBAD, NM 88221-0792
PO BOX 793, CARLSBAD, NM 88221-0793
PO BOX 794, CARLSBAD, NM 88221-0794
PO BOX 795, CARLSBAD, NM 88221-0795
PO BOX 796, CARLSBAD, NM 88221-0796
PO BOX 797, CARLSBAD, NM 88221-0797
PO BOX 798, CARLSBAD, NM 88221-0798
PO BOX 799, CARLSBAD, NM 88221-0799
PO BOX 800, CARLSBAD, NM 88221-0800
PO BOX 801, CARLSBAD, NM 88221-0801
PO BOX 802, CARLSBAD, NM 88221-0802
PO BOX 803, CARLSBAD, NM 88221-0803
PO BOX 804, CARLSBAD, NM 88221-0804
PO BOX 805, CARLSBAD, NM 88221-0805
PO BOX 806, CARLSBAD, NM 88221-0806
PO BOX 807, CARLSBAD, NM 88221-0807
PO BOX 808, CARLSBAD, NM 88221-0808
PO BOX 809, CARLSBAD, NM 88221-0809
PO BOX 810, CARLSBAD, NM 88221-0810
PO BOX 811, CARLSBAD, NM 88221-0811
PO BOX 812, CARLSBAD, NM 88221-0812
PO BOX 813, CARLSBAD, NM 88221-0813
PO BOX 814, CARLSBAD, NM 88221-0814
PO BOX 815, CARLSBAD, NM 88221-0815
PO BOX 816, CARLSBAD, NM 88221-0816
PO BOX 817, CARLSBAD, NM 88221-0817
PO BOX 818, CARLSBAD, NM 88221-0818
PO BOX 819, CARLSBAD, NM 88221-0819
PO BOX 820, CARLSBAD, NM 88221-0820
PO BOX 821, CARLSBAD, NM 88221-0821
PO BOX 822, CARLSBAD, NM 88221-0822
PO BOX 823, CARLSBAD, NM 88221-0823
PO BOX 824, CARLSBAD, NM 88221-0824
PO BOX 825, CARLSBAD, NM 88221-0825
PO BOX 826, CARLSBAD, NM 88221-0826
PO BOX 827, CARLSBAD, NM 88221-0827
PO BOX 828, CARLSBAD, NM 88221-0828
PO BOX 829, CARLSBAD, NM 88221-0829
PO BOX 830, CARLSBAD, NM 88221-0830
PO BOX 831, CARLSBAD, NM 88221-0831
PO BOX 832, CARLSBAD, NM 88221-0832
PO BOX 833, CARLSBAD, NM 88221-0833
PO BOX 834, CARLSBAD, NM 88221-0834
PO BOX 835, CARLSBAD, NM 88221-0835
PO BOX 836, CARLSBAD, NM 88221-0836
PO BOX 837, CARLSBAD, NM 88221-0837
PO BOX 838, CARLSBAD, NM 88221-0838
PO BOX 839, CARLSBAD, NM 88221-0839
PO BOX 840, CARLSBAD, NM 88221-0840
PO BOX 841, CARLSBAD, NM 88221-0841
PO BOX 842, CARLSBAD, NM 88221-0842
PO BOX 843, CARLSBAD, NM 88221-0843
PO BOX 844, CARLSBAD, NM 88221-0844
PO BOX 845, CARLSBAD, NM 88221-0845
PO BOX 846, CARLSBAD, NM 88221-0846
PO BOX 847, CARLSBAD, NM 88221-0847
PO BOX 848, CARLSBAD, NM 88221-0848
PO BOX 849, CARLSBAD, NM 88221-0849
PO BOX 850, CARLSBAD, NM 88221-0850
PO BOX 851, CARLSBAD, NM 88221-0851
PO BOX 852, CARLSBAD, NM 88221-0852
PO BOX 853, CARLSBAD, NM 88221-0853
PO BOX 854, CARLSBAD, NM 88221-0854
PO BOX 855, CARLSBAD, NM 88221-0855
PO BOX 856, CARLSBAD, NM 88221-0856
PO BOX 857, CARLSBAD, NM 88221-0857
PO BOX 858, CARLSBAD, NM 88221-0858
PO BOX 859, CARLSBAD, NM 88221-0859
PO BOX 860, CARLSBAD, NM 88221-0860
PO BOX 861, CARLSBAD, NM 88221-0861
PO BOX 862, CARLSBAD, NM 88221-0862
PO BOX 863, CARLSBAD, NM 88221-0863
PO BOX 864, CARLSBAD, NM 88221-0864
PO BOX 865, CARLSBAD, NM 88221-0865
PO BOX 866, CARLSBAD, NM 88221-0866
PO BOX 867, CARLSBAD, NM 88221-0867
PO BOX 868, CARLSBAD, NM 88221-0868
PO BOX 869, CARLSBAD, NM 88221-0869
PO BOX 870, CARLSBAD, NM 88221-0870
PO BOX 871, CARLSBAD, NM 88221-0871
PO BOX 872, CARLSBAD, NM 88221-0872
PO BOX 873, CARLSBAD, NM 88221-0873
PO BOX 874, CARLSBAD, NM 88221-0874
PO BOX 875, CARLSBAD, NM 88221-0875
PO BOX 876, CARLSBAD, NM 88221-0876
PO BOX 877, CARLSBAD, NM 88221-0877
PO BOX 878, CARLSBAD, NM 88221-0878
PO BOX 879, CARLSBAD, NM 88221-0879
PO BOX 880, CARLSBAD, NM 88221-0880
PO BOX 881, CARLSBAD, NM 88221-0881
PO BOX 882, CARLSBAD, NM 88221-0882
PO BOX 883, CARLSBAD, NM 88221-0883
PO BOX 884, CARLSBAD, NM 88221-0884
PO BOX 885, CARLSBAD, NM 88221-0885
PO BOX 886, CARLSBAD, NM 88221-0886
PO BOX 887, CARLSBAD, NM 88221-0887
PO BOX 888, CARLSBAD, NM 88221-0888
PO BOX 889, CARLSBAD, NM 88221-0889
PO BOX 890, CARLSBAD, NM 88221-0890
PO BOX 891, CARLSBAD, NM 88221-0891
PO BOX 892, CARLSBAD, NM 88221-0892
PO BOX 893, CARLSBAD, NM 88221-0893
PO BOX 894, CARLSBAD, NM 88221-0894
PO BOX 895, CARLSBAD, NM 88221-0895
PO BOX 896, CARLSBAD, NM 88221-0896
PO BOX 897, CARLSBAD, NM 88221-0897
PO BOX 898, CARLSBAD, NM 88221-0898
PO BOX 899, CARLSBAD, NM 88221-0899
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