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 661, SAN MARCOS, CA 92079-0661
PO BOX 662, SAN MARCOS, CA 92079-0662
PO BOX 663, SAN MARCOS, CA 92079-0663
PO BOX 664, SAN MARCOS, CA 92079-0664
PO BOX 665, SAN MARCOS, CA 92079-0665
PO BOX 666, SAN MARCOS, CA 92079-0666
PO BOX 667, SAN MARCOS, CA 92079-0667
PO BOX 668, SAN MARCOS, CA 92079-0668
PO BOX 669, SAN MARCOS, CA 92079-0669
PO BOX 670, SAN MARCOS, CA 92079-0670
PO BOX 671, SAN MARCOS, CA 92079-0671
PO BOX 672, SAN MARCOS, CA 92079-0672
PO BOX 673, SAN MARCOS, CA 92079-0673
PO BOX 674, SAN MARCOS, CA 92079-0674
PO BOX 675, SAN MARCOS, CA 92079-0675
PO BOX 676, SAN MARCOS, CA 92079-0676
PO BOX 677, SAN MARCOS, CA 92079-0677
PO BOX 678, SAN MARCOS, CA 92079-0678
PO BOX 679, SAN MARCOS, CA 92079-0679
PO BOX 680, SAN MARCOS, CA 92079-0680
PO BOX 681, SAN MARCOS, CA 92079-0681
PO BOX 682, SAN MARCOS, CA 92079-0682
PO BOX 683, SAN MARCOS, CA 92079-0683
PO BOX 684, SAN MARCOS, CA 92079-0684
PO BOX 685, SAN MARCOS, CA 92079-0685
PO BOX 686, SAN MARCOS, CA 92079-0686
PO BOX 687, SAN MARCOS, CA 92079-0687
PO BOX 688, SAN MARCOS, CA 92079-0688
PO BOX 689, SAN MARCOS, CA 92079-0689
PO BOX 690, SAN MARCOS, CA 92079-0690
PO BOX 691, SAN MARCOS, CA 92079-0691
PO BOX 692, SAN MARCOS, CA 92079-0692
PO BOX 693, SAN MARCOS, CA 92079-0693
PO BOX 694, SAN MARCOS, CA 92079-0694
PO BOX 695, SAN MARCOS, CA 92079-0695
PO BOX 696, SAN MARCOS, CA 92079-0696
PO BOX 697, SAN MARCOS, CA 92079-0697
PO BOX 698, SAN MARCOS, CA 92079-0698
PO BOX 699, SAN MARCOS, CA 92079-0699
PO BOX 700, SAN MARCOS, CA 92079-0700
PO BOX 701, SAN MARCOS, CA 92079-0701
PO BOX 702, SAN MARCOS, CA 92079-0702
PO BOX 703, SAN MARCOS, CA 92079-0703
PO BOX 704, SAN MARCOS, CA 92079-0704
PO BOX 705, SAN MARCOS, CA 92079-0705
PO BOX 706, SAN MARCOS, CA 92079-0706
PO BOX 707, SAN MARCOS, CA 92079-0707
PO BOX 708, SAN MARCOS, CA 92079-0708
PO BOX 709, SAN MARCOS, CA 92079-0709
PO BOX 710, SAN MARCOS, CA 92079-0710
PO BOX 711, SAN MARCOS, CA 92079-0711
PO BOX 712, SAN MARCOS, CA 92079-0712
PO BOX 713, SAN MARCOS, CA 92079-0713
PO BOX 714, SAN MARCOS, CA 92079-0714
PO BOX 715, SAN MARCOS, CA 92079-0715
PO BOX 716, SAN MARCOS, CA 92079-0716
PO BOX 717, SAN MARCOS, CA 92079-0717
PO BOX 718, SAN MARCOS, CA 92079-0718
PO BOX 719, SAN MARCOS, CA 92079-0719
PO BOX 720, SAN MARCOS, CA 92079-0720
PO BOX 721, SAN MARCOS, CA 92079-0721
PO BOX 722, SAN MARCOS, CA 92079-0722
PO BOX 723, SAN MARCOS, CA 92079-0723
PO BOX 724, SAN MARCOS, CA 92079-0724
PO BOX 725, SAN MARCOS, CA 92079-0725
PO BOX 726, SAN MARCOS, CA 92079-0726
PO BOX 727, SAN MARCOS, CA 92079-0727
PO BOX 728, SAN MARCOS, CA 92079-0728
PO BOX 729, SAN MARCOS, CA 92079-0729
PO BOX 730, SAN MARCOS, CA 92079-0730
PO BOX 731, SAN MARCOS, CA 92079-0731
PO BOX 732, SAN MARCOS, CA 92079-0732
PO BOX 733, SAN MARCOS, CA 92079-0733
PO BOX 734, SAN MARCOS, CA 92079-0734
PO BOX 735, SAN MARCOS, CA 92079-0735
PO BOX 736, SAN MARCOS, CA 92079-0736
PO BOX 737, SAN MARCOS, CA 92079-0737
PO BOX 738, SAN MARCOS, CA 92079-0738
PO BOX 739, SAN MARCOS, CA 92079-0739
PO BOX 740, SAN MARCOS, CA 92079-0740
PO BOX 741, SAN MARCOS, CA 92079-0741
PO BOX 742, SAN MARCOS, CA 92079-0742
PO BOX 743, SAN MARCOS, CA 92079-0743
PO BOX 744, SAN MARCOS, CA 92079-0744
PO BOX 745, SAN MARCOS, CA 92079-0745
PO BOX 746, SAN MARCOS, CA 92079-0746
PO BOX 747, SAN MARCOS, CA 92079-0747
PO BOX 748, SAN MARCOS, CA 92079-0748
PO BOX 749, SAN MARCOS, CA 92079-0749
PO BOX 750, SAN MARCOS, CA 92079-0750
PO BOX 751, SAN MARCOS, CA 92079-0751
PO BOX 752, SAN MARCOS, CA 92079-0752
PO BOX 753, SAN MARCOS, CA 92079-0753
PO BOX 754, SAN MARCOS, CA 92079-0754
PO BOX 755, SAN MARCOS, CA 92079-0755
PO BOX 756, SAN MARCOS, CA 92079-0756
PO BOX 757, SAN MARCOS, CA 92079-0757
PO BOX 758, SAN MARCOS, CA 92079-0758
PO BOX 759, SAN MARCOS, CA 92079-0759
PO BOX 760, SAN MARCOS, CA 92079-0760
PO BOX 761, SAN MARCOS, CA 92079-0761
PO BOX 762, SAN MARCOS, CA 92079-0762
PO BOX 763, SAN MARCOS, CA 92079-0763
PO BOX 764, SAN MARCOS, CA 92079-0764
PO BOX 765, SAN MARCOS, CA 92079-0765
PO BOX 766, SAN MARCOS, CA 92079-0766
PO BOX 767, SAN MARCOS, CA 92079-0767
PO BOX 768, SAN MARCOS, CA 92079-0768
PO BOX 769, SAN MARCOS, CA 92079-0769
PO BOX 770, SAN MARCOS, CA 92079-0770
PO BOX 771, SAN MARCOS, CA 92079-0771
PO BOX 772, SAN MARCOS, CA 92079-0772
PO BOX 773, SAN MARCOS, CA 92079-0773
PO BOX 774, SAN MARCOS, CA 92079-0774
PO BOX 775, SAN MARCOS, CA 92079-0775
PO BOX 776, SAN MARCOS, CA 92079-0776
PO BOX 777, SAN MARCOS, CA 92079-0777
PO BOX 778, SAN MARCOS, CA 92079-0778
PO BOX 779, SAN MARCOS, CA 92079-0779
PO BOX 780, SAN MARCOS, CA 92079-0780
PO BOX 781, SAN MARCOS, CA 92079-0781
PO BOX 782, SAN MARCOS, CA 92079-0782
PO BOX 783, SAN MARCOS, CA 92079-0783
PO BOX 784, SAN MARCOS, CA 92079-0784
PO BOX 785, SAN MARCOS, CA 92079-0785
PO BOX 786, SAN MARCOS, CA 92079-0786
PO BOX 787, SAN MARCOS, CA 92079-0787
PO BOX 788, SAN MARCOS, CA 92079-0788
PO BOX 789, SAN MARCOS, CA 92079-0789
PO BOX 790, SAN MARCOS, CA 92079-0790
PO BOX 791, SAN MARCOS, CA 92079-0791
PO BOX 792, SAN MARCOS, CA 92079-0792
PO BOX 793, SAN MARCOS, CA 92079-0793
PO BOX 794, SAN MARCOS, CA 92079-0794
PO BOX 795, SAN MARCOS, CA 92079-0795
PO BOX 796, SAN MARCOS, CA 92079-0796
PO BOX 797, SAN MARCOS, CA 92079-0797
PO BOX 798, SAN MARCOS, CA 92079-0798
PO BOX 799, SAN MARCOS, CA 92079-0799
PO BOX 800, SAN MARCOS, CA 92079-0800
PO BOX 801, SAN MARCOS, CA 92079-0801
PO BOX 802, SAN MARCOS, CA 92079-0802
PO BOX 803, SAN MARCOS, CA 92079-0803
PO BOX 804, SAN MARCOS, CA 92079-0804
PO BOX 805, SAN MARCOS, CA 92079-0805
PO BOX 806, SAN MARCOS, CA 92079-0806
PO BOX 807, SAN MARCOS, CA 92079-0807
PO BOX 808, SAN MARCOS, CA 92079-0808
PO BOX 809, SAN MARCOS, CA 92079-0809
PO BOX 810, SAN MARCOS, CA 92079-0810
PO BOX 811, SAN MARCOS, CA 92079-0811
PO BOX 812, SAN MARCOS, CA 92079-0812
PO BOX 813, SAN MARCOS, CA 92079-0813
PO BOX 814, SAN MARCOS, CA 92079-0814
PO BOX 815, SAN MARCOS, CA 92079-0815
PO BOX 816, SAN MARCOS, CA 92079-0816
PO BOX 817, SAN MARCOS, CA 92079-0817
PO BOX 818, SAN MARCOS, CA 92079-0818
PO BOX 819, SAN MARCOS, CA 92079-0819
PO BOX 820, SAN MARCOS, CA 92079-0820
PO BOX 821, SAN MARCOS, CA 92079-0821
PO BOX 822, SAN MARCOS, CA 92079-0822
PO BOX 823, SAN MARCOS, CA 92079-0823
PO BOX 824, SAN MARCOS, CA 92079-0824
PO BOX 825, SAN MARCOS, CA 92079-0825
PO BOX 826, SAN MARCOS, CA 92079-0826
PO BOX 827, SAN MARCOS, CA 92079-0827
PO BOX 828, SAN MARCOS, CA 92079-0828
PO BOX 829, SAN MARCOS, CA 92079-0829
PO BOX 830, SAN MARCOS, CA 92079-0830
PO BOX 831, SAN MARCOS, CA 92079-0831
PO BOX 832, SAN MARCOS, CA 92079-0832
PO BOX 833, SAN MARCOS, CA 92079-0833
PO BOX 834, SAN MARCOS, CA 92079-0834
PO BOX 835, SAN MARCOS, CA 92079-0835
PO BOX 836, SAN MARCOS, CA 92079-0836
PO BOX 837, SAN MARCOS, CA 92079-0837
PO BOX 838, SAN MARCOS, CA 92079-0838
PO BOX 839, SAN MARCOS, CA 92079-0839
PO BOX 840, SAN MARCOS, CA 92079-0840
PO BOX 841, SAN MARCOS, CA 92079-0841
PO BOX 842, SAN MARCOS, CA 92079-0842
PO BOX 843, SAN MARCOS, CA 92079-0843
PO BOX 844, SAN MARCOS, CA 92079-0844
PO BOX 845, SAN MARCOS, CA 92079-0845
PO BOX 846, SAN MARCOS, CA 92079-0846
PO BOX 847, SAN MARCOS, CA 92079-0847
PO BOX 848, SAN MARCOS, CA 92079-0848
PO BOX 849, SAN MARCOS, CA 92079-0849
PO BOX 850, SAN MARCOS, CA 92079-0850
PO BOX 851, SAN MARCOS, CA 92079-0851
PO BOX 852, SAN MARCOS, CA 92079-0852
PO BOX 853, SAN MARCOS, CA 92079-0853
PO BOX 854, SAN MARCOS, CA 92079-0854
PO BOX 855, SAN MARCOS, CA 92079-0855
PO BOX 856, SAN MARCOS, CA 92079-0856
PO BOX 857, SAN MARCOS, CA 92079-0857
PO BOX 858, SAN MARCOS, CA 92079-0858
PO BOX 859, SAN MARCOS, CA 92079-0859
PO BOX 860, SAN MARCOS, CA 92079-0860
PO BOX 861, SAN MARCOS, CA 92079-0861
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