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, PASADENA, CA 91102-0681
PO BOX 682, PASADENA, CA 91102-0682
PO BOX 683, PASADENA, CA 91102-0683
PO BOX 684, PASADENA, CA 91102-0684
PO BOX 685, PASADENA, CA 91102-0685
PO BOX 686, PASADENA, CA 91102-0686
PO BOX 687, PASADENA, CA 91102-0687
PO BOX 688, PASADENA, CA 91102-0688
PO BOX 689, PASADENA, CA 91102-0689
PO BOX 690, PASADENA, CA 91102-0690
PO BOX 691, PASADENA, CA 91102-0691
PO BOX 692, PASADENA, CA 91102-0692
PO BOX 693, PASADENA, CA 91102-0693
PO BOX 694, PASADENA, CA 91102-0694
PO BOX 695, PASADENA, CA 91102-0695
PO BOX 696, PASADENA, CA 91102-0696
PO BOX 697, PASADENA, CA 91102-0697
PO BOX 698, PASADENA, CA 91102-0698
PO BOX 699, PASADENA, CA 91102-0699
PO BOX 700, PASADENA, CA 91102-0700
PO BOX 701, PASADENA, CA 91102-0701
PO BOX 702, PASADENA, CA 91102-0702
PO BOX 703, PASADENA, CA 91102-0703
PO BOX 704, PASADENA, CA 91102-0704
PO BOX 705, PASADENA, CA 91102-0705
PO BOX 706, PASADENA, CA 91102-0706
PO BOX 707, PASADENA, CA 91102-0707
PO BOX 708, PASADENA, CA 91102-0708
PO BOX 709, PASADENA, CA 91102-0709
PO BOX 710, PASADENA, CA 91102-0710
PO BOX 711, PASADENA, CA 91102-0711
PO BOX 712, PASADENA, CA 91102-0712
PO BOX 713, PASADENA, CA 91102-0713
PO BOX 714, PASADENA, CA 91102-0714
PO BOX 715, PASADENA, CA 91102-0715
PO BOX 716, PASADENA, CA 91102-0716
PO BOX 717, PASADENA, CA 91102-0717
PO BOX 718, PASADENA, CA 91102-0718
PO BOX 719, PASADENA, CA 91102-0719
PO BOX 720, PASADENA, CA 91102-0720
PO BOX 721, PASADENA, CA 91102-0721
PO BOX 722, PASADENA, CA 91102-0722
PO BOX 723, PASADENA, CA 91102-0723
PO BOX 724, PASADENA, CA 91102-0724
PO BOX 725, PASADENA, CA 91102-0725
PO BOX 726, PASADENA, CA 91102-0726
PO BOX 727, PASADENA, CA 91102-0727
PO BOX 728, PASADENA, CA 91102-0728
PO BOX 729, PASADENA, CA 91102-0729
PO BOX 730, PASADENA, CA 91102-0730
PO BOX 731, PASADENA, CA 91102-0731
PO BOX 732, PASADENA, CA 91102-0732
PO BOX 733, PASADENA, CA 91102-0733
PO BOX 734, PASADENA, CA 91102-0734
PO BOX 735, PASADENA, CA 91102-0735
PO BOX 736, PASADENA, CA 91102-0736
PO BOX 737, PASADENA, CA 91102-0737
PO BOX 738, PASADENA, CA 91102-0738
PO BOX 739, PASADENA, CA 91102-0739
PO BOX 740, PASADENA, CA 91102-0740
PO BOX 741, PASADENA, CA 91102-0741
PO BOX 742, PASADENA, CA 91102-0742
PO BOX 743, PASADENA, CA 91102-0743
PO BOX 744, PASADENA, CA 91102-0744
PO BOX 745, PASADENA, CA 91102-0745
PO BOX 746, PASADENA, CA 91102-0746
PO BOX 747, PASADENA, CA 91102-0747
PO BOX 748, PASADENA, CA 91102-0748
PO BOX 749, PASADENA, CA 91102-0749
PO BOX 750, PASADENA, CA 91102-0750
PO BOX 751, PASADENA, CA 91102-0751
PO BOX 752, PASADENA, CA 91102-0752
PO BOX 753, PASADENA, CA 91102-0753
PO BOX 754, PASADENA, CA 91102-0754
PO BOX 755, PASADENA, CA 91102-0755
PO BOX 756, PASADENA, CA 91102-0756
PO BOX 757, PASADENA, CA 91102-0757
PO BOX 758, PASADENA, CA 91102-0758
PO BOX 759, PASADENA, CA 91102-0759
PO BOX 760, PASADENA, CA 91102-0760
PO BOX 761, PASADENA, CA 91102-0761
PO BOX 762, PASADENA, CA 91102-0762
PO BOX 763, PASADENA, CA 91102-0763
PO BOX 764, PASADENA, CA 91102-0764
PO BOX 765, PASADENA, CA 91102-0765
PO BOX 766, PASADENA, CA 91102-0766
PO BOX 767, PASADENA, CA 91102-0767
PO BOX 768, PASADENA, CA 91102-0768
PO BOX 769, PASADENA, CA 91102-0769
PO BOX 770, PASADENA, CA 91102-0770
PO BOX 771, PASADENA, CA 91102-0771
PO BOX 772, PASADENA, CA 91102-0772
PO BOX 773, PASADENA, CA 91102-0773
PO BOX 774, PASADENA, CA 91102-0774
PO BOX 775, PASADENA, CA 91102-0775
PO BOX 776, PASADENA, CA 91102-0776
PO BOX 777, PASADENA, CA 91102-0777
PO BOX 778, PASADENA, CA 91102-0778
PO BOX 779, PASADENA, CA 91102-0779
PO BOX 780, PASADENA, CA 91102-0780
PO BOX 781, PASADENA, CA 91102-0781
PO BOX 782, PASADENA, CA 91102-0782
PO BOX 783, PASADENA, CA 91102-0783
PO BOX 784, PASADENA, CA 91102-0784
PO BOX 785, PASADENA, CA 91102-0785
PO BOX 786, PASADENA, CA 91102-0786
PO BOX 787, PASADENA, CA 91102-0787
PO BOX 788, PASADENA, CA 91102-0788
PO BOX 789, PASADENA, CA 91102-0789
PO BOX 790, PASADENA, CA 91102-0790
PO BOX 791, PASADENA, CA 91102-0791
PO BOX 792, PASADENA, CA 91102-0792
PO BOX 793, PASADENA, CA 91102-0793
PO BOX 794, PASADENA, CA 91102-0794
PO BOX 795, PASADENA, CA 91102-0795
PO BOX 796, PASADENA, CA 91102-0796
PO BOX 797, PASADENA, CA 91102-0797
PO BOX 798, PASADENA, CA 91102-0798
PO BOX 799, PASADENA, CA 91102-0799
PO BOX 800, PASADENA, CA 91102-0800
PO BOX 801, PASADENA, CA 91102-0801
PO BOX 802, PASADENA, CA 91102-0802
PO BOX 803, PASADENA, CA 91102-0803
PO BOX 804, PASADENA, CA 91102-0804
PO BOX 805, PASADENA, CA 91102-0805
PO BOX 806, PASADENA, CA 91102-0806
PO BOX 807, PASADENA, CA 91102-0807
PO BOX 808, PASADENA, CA 91102-0808
PO BOX 809, PASADENA, CA 91102-0809
PO BOX 810, PASADENA, CA 91102-0810
PO BOX 811, PASADENA, CA 91102-0811
PO BOX 812, PASADENA, CA 91102-0812
PO BOX 813, PASADENA, CA 91102-0813
PO BOX 814, PASADENA, CA 91102-0814
PO BOX 815, PASADENA, CA 91102-0815
PO BOX 816, PASADENA, CA 91102-0816
PO BOX 817, PASADENA, CA 91102-0817
PO BOX 818, PASADENA, CA 91102-0818
PO BOX 819, PASADENA, CA 91102-0819
PO BOX 820, PASADENA, CA 91102-0820
PO BOX 821, PASADENA, CA 91102-0821
PO BOX 822, PASADENA, CA 91102-0822
PO BOX 823, PASADENA, CA 91102-0823
PO BOX 824, PASADENA, CA 91102-0824
PO BOX 825, PASADENA, CA 91102-0825
PO BOX 826, PASADENA, CA 91102-0826
PO BOX 827, PASADENA, CA 91102-0827
PO BOX 828, PASADENA, CA 91102-0828
PO BOX 829, PASADENA, CA 91102-0829
PO BOX 830, PASADENA, CA 91102-0830
PO BOX 831, PASADENA, CA 91102-0831
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