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 681, PORTERVILLE, CA 93258-0681
PO BOX 682, PORTERVILLE, CA 93258-0682
PO BOX 683, PORTERVILLE, CA 93258-0683
PO BOX 684, PORTERVILLE, CA 93258-0684
PO BOX 685, PORTERVILLE, CA 93258-0685
PO BOX 686, PORTERVILLE, CA 93258-0686
PO BOX 687, PORTERVILLE, CA 93258-0687
PO BOX 688, PORTERVILLE, CA 93258-0688
PO BOX 689, PORTERVILLE, CA 93258-0689
PO BOX 690, PORTERVILLE, CA 93258-0690
PO BOX 691, PORTERVILLE, CA 93258-0691
PO BOX 692, PORTERVILLE, CA 93258-0692
PO BOX 693, PORTERVILLE, CA 93258-0693
PO BOX 694, PORTERVILLE, CA 93258-0694
PO BOX 695, PORTERVILLE, CA 93258-0695
PO BOX 696, PORTERVILLE, CA 93258-0696
PO BOX 697, PORTERVILLE, CA 93258-0697
PO BOX 698, PORTERVILLE, CA 93258-0698
PO BOX 699, PORTERVILLE, CA 93258-0699
PO BOX 700, PORTERVILLE, CA 93258-0700
PO BOX 701, PORTERVILLE, CA 93258-0701
PO BOX 702, PORTERVILLE, CA 93258-0702
PO BOX 703, PORTERVILLE, CA 93258-0703
PO BOX 704, PORTERVILLE, CA 93258-0704
PO BOX 705, PORTERVILLE, CA 93258-0705
PO BOX 706, PORTERVILLE, CA 93258-0706
PO BOX 707, PORTERVILLE, CA 93258-0707
PO BOX 708, PORTERVILLE, CA 93258-0708
PO BOX 709, PORTERVILLE, CA 93258-0709
PO BOX 710, PORTERVILLE, CA 93258-0710
PO BOX 711, PORTERVILLE, CA 93258-0711
PO BOX 712, PORTERVILLE, CA 93258-0712
PO BOX 713, PORTERVILLE, CA 93258-0713
PO BOX 714, PORTERVILLE, CA 93258-0714
PO BOX 715, PORTERVILLE, CA 93258-0715
PO BOX 716, PORTERVILLE, CA 93258-0716
PO BOX 717, PORTERVILLE, CA 93258-0717
PO BOX 718, PORTERVILLE, CA 93258-0718
PO BOX 719, PORTERVILLE, CA 93258-0719
PO BOX 720, PORTERVILLE, CA 93258-0720
PO BOX 721, PORTERVILLE, CA 93258-0721
PO BOX 722, PORTERVILLE, CA 93258-0722
PO BOX 723, PORTERVILLE, CA 93258-0723
PO BOX 724, PORTERVILLE, CA 93258-0724
PO BOX 725, PORTERVILLE, CA 93258-0725
PO BOX 726, PORTERVILLE, CA 93258-0726
PO BOX 727, PORTERVILLE, CA 93258-0727
PO BOX 728, PORTERVILLE, CA 93258-0728
PO BOX 729, PORTERVILLE, CA 93258-0729
PO BOX 730, PORTERVILLE, CA 93258-0730
PO BOX 731, PORTERVILLE, CA 93258-0731
PO BOX 732, PORTERVILLE, CA 93258-0732
PO BOX 733, PORTERVILLE, CA 93258-0733
PO BOX 734, PORTERVILLE, CA 93258-0734
PO BOX 735, PORTERVILLE, CA 93258-0735
PO BOX 736, PORTERVILLE, CA 93258-0736
PO BOX 737, PORTERVILLE, CA 93258-0737
PO BOX 738, PORTERVILLE, CA 93258-0738
PO BOX 739, PORTERVILLE, CA 93258-0739
PO BOX 740, PORTERVILLE, CA 93258-0740
PO BOX 741, PORTERVILLE, CA 93258-0741
PO BOX 742, PORTERVILLE, CA 93258-0742
PO BOX 743, PORTERVILLE, CA 93258-0743
PO BOX 744, PORTERVILLE, CA 93258-0744
PO BOX 745, PORTERVILLE, CA 93258-0745
PO BOX 746, PORTERVILLE, CA 93258-0746
PO BOX 747, PORTERVILLE, CA 93258-0747
PO BOX 748, PORTERVILLE, CA 93258-0748
PO BOX 749, PORTERVILLE, CA 93258-0749
PO BOX 750, PORTERVILLE, CA 93258-0750
PO BOX 751, PORTERVILLE, CA 93258-0751
PO BOX 752, PORTERVILLE, CA 93258-0752
PO BOX 753, PORTERVILLE, CA 93258-0753
PO BOX 754, PORTERVILLE, CA 93258-0754
PO BOX 755, PORTERVILLE, CA 93258-0755
PO BOX 756, PORTERVILLE, CA 93258-0756
PO BOX 757, PORTERVILLE, CA 93258-0757
PO BOX 758, PORTERVILLE, CA 93258-0758
PO BOX 759, PORTERVILLE, CA 93258-0759
PO BOX 760, PORTERVILLE, CA 93258-0760
PO BOX 761, PORTERVILLE, CA 93258-0761
PO BOX 762, PORTERVILLE, CA 93258-0762
PO BOX 763, PORTERVILLE, CA 93258-0763
PO BOX 764, PORTERVILLE, CA 93258-0764
PO BOX 765, PORTERVILLE, CA 93258-0765
PO BOX 766, PORTERVILLE, CA 93258-0766
PO BOX 767, PORTERVILLE, CA 93258-0767
PO BOX 768, PORTERVILLE, CA 93258-0768
PO BOX 769, PORTERVILLE, CA 93258-0769
PO BOX 770, PORTERVILLE, CA 93258-0770
PO BOX 771, PORTERVILLE, CA 93258-0771
PO BOX 772, PORTERVILLE, CA 93258-0772
PO BOX 773, PORTERVILLE, CA 93258-0773
PO BOX 774, PORTERVILLE, CA 93258-0774
PO BOX 775, PORTERVILLE, CA 93258-0775
PO BOX 776, PORTERVILLE, CA 93258-0776
PO BOX 777, PORTERVILLE, CA 93258-0777
PO BOX 778, PORTERVILLE, CA 93258-0778
PO BOX 779, PORTERVILLE, CA 93258-0779
PO BOX 780, PORTERVILLE, CA 93258-0780
PO BOX 781, PORTERVILLE, CA 93258-0781
PO BOX 782, PORTERVILLE, CA 93258-0782
PO BOX 783, PORTERVILLE, CA 93258-0783
PO BOX 784, PORTERVILLE, CA 93258-0784
PO BOX 785, PORTERVILLE, CA 93258-0785
PO BOX 786, PORTERVILLE, CA 93258-0786
PO BOX 787, PORTERVILLE, CA 93258-0787
PO BOX 788, PORTERVILLE, CA 93258-0788
PO BOX 789, PORTERVILLE, CA 93258-0789
PO BOX 790, PORTERVILLE, CA 93258-0790
PO BOX 791, PORTERVILLE, CA 93258-0791
PO BOX 792, PORTERVILLE, CA 93258-0792
PO BOX 793, PORTERVILLE, CA 93258-0793
PO BOX 794, PORTERVILLE, CA 93258-0794
PO BOX 795, PORTERVILLE, CA 93258-0795
PO BOX 796, PORTERVILLE, CA 93258-0796
PO BOX 797, PORTERVILLE, CA 93258-0797
PO BOX 798, PORTERVILLE, CA 93258-0798
PO BOX 799, PORTERVILLE, CA 93258-0799
PO BOX 800, PORTERVILLE, CA 93258-0800
PO BOX 801, PORTERVILLE, CA 93258-0801
PO BOX 802, PORTERVILLE, CA 93258-0802
PO BOX 803, PORTERVILLE, CA 93258-0803
PO BOX 804, PORTERVILLE, CA 93258-0804
PO BOX 805, PORTERVILLE, CA 93258-0805
PO BOX 806, PORTERVILLE, CA 93258-0806
PO BOX 807, PORTERVILLE, CA 93258-0807
PO BOX 808, PORTERVILLE, CA 93258-0808
PO BOX 809, PORTERVILLE, CA 93258-0809
PO BOX 810, PORTERVILLE, CA 93258-0810
PO BOX 811, PORTERVILLE, CA 93258-0811
PO BOX 812, PORTERVILLE, CA 93258-0812
PO BOX 813, PORTERVILLE, CA 93258-0813
PO BOX 814, PORTERVILLE, CA 93258-0814
PO BOX 815, PORTERVILLE, CA 93258-0815
PO BOX 816, PORTERVILLE, CA 93258-0816
PO BOX 817, PORTERVILLE, CA 93258-0817
PO BOX 818, PORTERVILLE, CA 93258-0818
PO BOX 819, PORTERVILLE, CA 93258-0819
PO BOX 820, PORTERVILLE, CA 93258-0820
PO BOX 821, PORTERVILLE, CA 93258-0821
PO BOX 822, PORTERVILLE, CA 93258-0822
PO BOX 823, PORTERVILLE, CA 93258-0823
PO BOX 824, PORTERVILLE, CA 93258-0824
PO BOX 825, PORTERVILLE, CA 93258-0825
PO BOX 826, PORTERVILLE, CA 93258-0826
PO BOX 827, PORTERVILLE, CA 93258-0827
PO BOX 828, PORTERVILLE, CA 93258-0828
PO BOX 829, PORTERVILLE, CA 93258-0829
PO BOX 830, PORTERVILLE, CA 93258-0830
PO BOX 831, PORTERVILLE, CA 93258-0831
PO BOX 832, PORTERVILLE, CA 93258-0832
PO BOX 833, PORTERVILLE, CA 93258-0833
PO BOX 834, PORTERVILLE, CA 93258-0834
PO BOX 835, PORTERVILLE, CA 93258-0835
PO BOX 836, PORTERVILLE, CA 93258-0836
PO BOX 837, PORTERVILLE, CA 93258-0837
PO BOX 838, PORTERVILLE, CA 93258-0838
PO BOX 839, PORTERVILLE, CA 93258-0839
PO BOX 840, PORTERVILLE, CA 93258-0840
PO BOX 841, PORTERVILLE, CA 93258-0841
PO BOX 842, PORTERVILLE, CA 93258-0842
PO BOX 843, PORTERVILLE, CA 93258-0843
PO BOX 844, PORTERVILLE, CA 93258-0844
PO BOX 845, PORTERVILLE, CA 93258-0845
PO BOX 846, PORTERVILLE, CA 93258-0846
PO BOX 847, PORTERVILLE, CA 93258-0847
PO BOX 848, PORTERVILLE, CA 93258-0848
PO BOX 849, PORTERVILLE, CA 93258-0849
PO BOX 850, PORTERVILLE, CA 93258-0850
PO BOX 851, PORTERVILLE, CA 93258-0851
PO BOX 852, PORTERVILLE, CA 93258-0852
PO BOX 853, PORTERVILLE, CA 93258-0853
PO BOX 854, PORTERVILLE, CA 93258-0854
PO BOX 855, PORTERVILLE, CA 93258-0855
PO BOX 856, PORTERVILLE, CA 93258-0856
PO BOX 857, PORTERVILLE, CA 93258-0857
PO BOX 858, PORTERVILLE, CA 93258-0858
PO BOX 859, PORTERVILLE, CA 93258-0859
PO BOX 860, PORTERVILLE, CA 93258-0860
PO BOX 861, PORTERVILLE, CA 93258-0861
PO BOX 862, PORTERVILLE, CA 93258-0862
PO BOX 863, PORTERVILLE, CA 93258-0863
PO BOX 864, PORTERVILLE, CA 93258-0864
PO BOX 865, PORTERVILLE, CA 93258-0865
PO BOX 866, PORTERVILLE, CA 93258-0866
PO BOX 867, PORTERVILLE, CA 93258-0867
PO BOX 868, PORTERVILLE, CA 93258-0868
PO BOX 869, PORTERVILLE, CA 93258-0869
PO BOX 870, PORTERVILLE, CA 93258-0870
PO BOX 871, PORTERVILLE, CA 93258-0871
PO BOX 872, PORTERVILLE, CA 93258-0872
PO BOX 873, PORTERVILLE, CA 93258-0873
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