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, SALINA, OK 74365-0661
PO BOX 662, SALINA, OK 74365-0662
PO BOX 663, SALINA, OK 74365-0663
PO BOX 664, SALINA, OK 74365-0664
PO BOX 665, SALINA, OK 74365-0665
PO BOX 666, SALINA, OK 74365-0666
PO BOX 667, SALINA, OK 74365-0667
PO BOX 668, SALINA, OK 74365-0668
PO BOX 669, SALINA, OK 74365-0669
PO BOX 670, SALINA, OK 74365-0670
PO BOX 671, SALINA, OK 74365-0671
PO BOX 672, SALINA, OK 74365-0672
PO BOX 673, SALINA, OK 74365-0673
PO BOX 674, SALINA, OK 74365-0674
PO BOX 675, SALINA, OK 74365-0675
PO BOX 676, SALINA, OK 74365-0676
PO BOX 677, SALINA, OK 74365-0677
PO BOX 678, SALINA, OK 74365-0678
PO BOX 679, SALINA, OK 74365-0679
PO BOX 680, SALINA, OK 74365-0680
PO BOX 681, SALINA, OK 74365-0681
PO BOX 682, SALINA, OK 74365-0682
PO BOX 683, SALINA, OK 74365-0683
PO BOX 684, SALINA, OK 74365-0684
PO BOX 685, SALINA, OK 74365-0685
PO BOX 686, SALINA, OK 74365-0686
PO BOX 687, SALINA, OK 74365-0687
PO BOX 688, SALINA, OK 74365-0688
PO BOX 689, SALINA, OK 74365-0689
PO BOX 690, SALINA, OK 74365-0690
PO BOX 691, SALINA, OK 74365-0691
PO BOX 692, SALINA, OK 74365-0692
PO BOX 693, SALINA, OK 74365-0693
PO BOX 694, SALINA, OK 74365-0694
PO BOX 695, SALINA, OK 74365-0695
PO BOX 696, SALINA, OK 74365-0696
PO BOX 697, SALINA, OK 74365-0697
PO BOX 698, SALINA, OK 74365-0698
PO BOX 699, SALINA, OK 74365-0699
PO BOX 700, SALINA, OK 74365-0700
PO BOX 701, SALINA, OK 74365-0701
PO BOX 702, SALINA, OK 74365-0702
PO BOX 703, SALINA, OK 74365-0703
PO BOX 704, SALINA, OK 74365-0704
PO BOX 705, SALINA, OK 74365-0705
PO BOX 706, SALINA, OK 74365-0706
PO BOX 707, SALINA, OK 74365-0707
PO BOX 708, SALINA, OK 74365-0708
PO BOX 709, SALINA, OK 74365-0709
PO BOX 710, SALINA, OK 74365-0710
PO BOX 711, SALINA, OK 74365-0711
PO BOX 712, SALINA, OK 74365-0712
PO BOX 713, SALINA, OK 74365-0713
PO BOX 714, SALINA, OK 74365-0714
PO BOX 715, SALINA, OK 74365-0715
PO BOX 716, SALINA, OK 74365-0716
PO BOX 717, SALINA, OK 74365-0717
PO BOX 718, SALINA, OK 74365-0718
PO BOX 719, SALINA, OK 74365-0719
PO BOX 720, SALINA, OK 74365-0720
PO BOX 721, SALINA, OK 74365-0721
PO BOX 722, SALINA, OK 74365-0722
PO BOX 723, SALINA, OK 74365-0723
PO BOX 724, SALINA, OK 74365-0724
PO BOX 725, SALINA, OK 74365-0725
PO BOX 726, SALINA, OK 74365-0726
PO BOX 727, SALINA, OK 74365-0727
PO BOX 728, SALINA, OK 74365-0728
PO BOX 729, SALINA, OK 74365-0729
PO BOX 730, SALINA, OK 74365-0730
PO BOX 731, SALINA, OK 74365-0731
PO BOX 732, SALINA, OK 74365-0732
PO BOX 733, SALINA, OK 74365-0733
PO BOX 734, SALINA, OK 74365-0734
PO BOX 735, SALINA, OK 74365-0735
PO BOX 736, SALINA, OK 74365-0736
PO BOX 737, SALINA, OK 74365-0737
PO BOX 738, SALINA, OK 74365-0738
PO BOX 739, SALINA, OK 74365-0739
PO BOX 740, SALINA, OK 74365-0740
PO BOX 741, SALINA, OK 74365-0741
PO BOX 742, SALINA, OK 74365-0742
PO BOX 743, SALINA, OK 74365-0743
PO BOX 744, SALINA, OK 74365-0744
PO BOX 745, SALINA, OK 74365-0745
PO BOX 746, SALINA, OK 74365-0746
PO BOX 747, SALINA, OK 74365-0747
PO BOX 748, SALINA, OK 74365-0748
PO BOX 749, SALINA, OK 74365-0749
PO BOX 750, SALINA, OK 74365-0750
PO BOX 751, SALINA, OK 74365-0751
PO BOX 752, SALINA, OK 74365-0752
PO BOX 753, SALINA, OK 74365-0753
PO BOX 754, SALINA, OK 74365-0754
PO BOX 755, SALINA, OK 74365-0755
PO BOX 756, SALINA, OK 74365-0756
PO BOX 757, SALINA, OK 74365-0757
PO BOX 758, SALINA, OK 74365-0758
PO BOX 759, SALINA, OK 74365-0759
PO BOX 760, SALINA, OK 74365-0760
PO BOX 761, SALINA, OK 74365-0761
PO BOX 762, SALINA, OK 74365-0762
PO BOX 763, SALINA, OK 74365-0763
PO BOX 764, SALINA, OK 74365-0764
PO BOX 765, SALINA, OK 74365-0765
PO BOX 766, SALINA, OK 74365-0766
PO BOX 767, SALINA, OK 74365-0767
PO BOX 768, SALINA, OK 74365-0768
PO BOX 769, SALINA, OK 74365-0769
PO BOX 770, SALINA, OK 74365-0770
PO BOX 771, SALINA, OK 74365-0771
PO BOX 772, SALINA, OK 74365-0772
PO BOX 773, SALINA, OK 74365-0773
PO BOX 774, SALINA, OK 74365-0774
PO BOX 775, SALINA, OK 74365-0775
PO BOX 776, SALINA, OK 74365-0776
PO BOX 777, SALINA, OK 74365-0777
PO BOX 778, SALINA, OK 74365-0778
PO BOX 779, SALINA, OK 74365-0779
PO BOX 780, SALINA, OK 74365-0780
PO BOX 781, SALINA, OK 74365-0781
PO BOX 782, SALINA, OK 74365-0782
PO BOX 783, SALINA, OK 74365-0783
PO BOX 784, SALINA, OK 74365-0784
PO BOX 785, SALINA, OK 74365-0785
PO BOX 786, SALINA, OK 74365-0786
PO BOX 787, SALINA, OK 74365-0787
PO BOX 788, SALINA, OK 74365-0788
PO BOX 789, SALINA, OK 74365-0789
PO BOX 790, SALINA, OK 74365-0790
PO BOX 791, SALINA, OK 74365-0791
PO BOX 792, SALINA, OK 74365-0792
PO BOX 793, SALINA, OK 74365-0793
PO BOX 794, SALINA, OK 74365-0794
PO BOX 795, SALINA, OK 74365-0795
PO BOX 796, SALINA, OK 74365-0796
PO BOX 797, SALINA, OK 74365-0797
PO BOX 798, SALINA, OK 74365-0798
PO BOX 799, SALINA, OK 74365-0799
PO BOX 800, SALINA, OK 74365-0800
PO BOX 801, SALINA, OK 74365-0801
PO BOX 802, SALINA, OK 74365-0802
PO BOX 803, SALINA, OK 74365-0803
PO BOX 804, SALINA, OK 74365-0804
PO BOX 805, SALINA, OK 74365-0805
PO BOX 806, SALINA, OK 74365-0806
PO BOX 807, SALINA, OK 74365-0807
PO BOX 808, SALINA, OK 74365-0808
PO BOX 809, SALINA, OK 74365-0809
PO BOX 810, SALINA, OK 74365-0810
PO BOX 811, SALINA, OK 74365-0811
PO BOX 812, SALINA, OK 74365-0812
PO BOX 813, SALINA, OK 74365-0813
PO BOX 814, SALINA, OK 74365-0814
PO BOX 815, SALINA, OK 74365-0815
PO BOX 816, SALINA, OK 74365-0816
PO BOX 817, SALINA, OK 74365-0817
PO BOX 818, SALINA, OK 74365-0818
PO BOX 819, SALINA, OK 74365-0819
PO BOX 820, SALINA, OK 74365-0820
PO BOX 821, SALINA, OK 74365-0821
PO BOX 822, SALINA, OK 74365-0822
PO BOX 823, SALINA, OK 74365-0823
PO BOX 824, SALINA, OK 74365-0824
PO BOX 825, SALINA, OK 74365-0825
PO BOX 826, SALINA, OK 74365-0826
PO BOX 827, SALINA, OK 74365-0827
PO BOX 828, SALINA, OK 74365-0828
PO BOX 829, SALINA, OK 74365-0829
PO BOX 830, SALINA, OK 74365-0830
PO BOX 831, SALINA, OK 74365-0831
PO BOX 832, SALINA, OK 74365-0832
PO BOX 833, SALINA, OK 74365-0833
PO BOX 834, SALINA, OK 74365-0834
PO BOX 835, SALINA, OK 74365-0835
PO BOX 836, SALINA, OK 74365-0836
PO BOX 837, SALINA, OK 74365-0837
PO BOX 838, SALINA, OK 74365-0838
PO BOX 839, SALINA, OK 74365-0839
PO BOX 840, SALINA, OK 74365-0840
PO BOX 841, SALINA, OK 74365-0841
PO BOX 842, SALINA, OK 74365-0842
PO BOX 843, SALINA, OK 74365-0843
PO BOX 844, SALINA, OK 74365-0844
PO BOX 845, SALINA, OK 74365-0845
PO BOX 846, SALINA, OK 74365-0846
PO BOX 847, SALINA, OK 74365-0847
PO BOX 848, SALINA, OK 74365-0848
PO BOX 849, SALINA, OK 74365-0849
PO BOX 850, SALINA, OK 74365-0850
PO BOX 851, SALINA, OK 74365-0851
PO BOX 852, SALINA, OK 74365-0852
PO BOX 853, SALINA, OK 74365-0853
PO BOX 854, SALINA, OK 74365-0854
PO BOX 855, SALINA, OK 74365-0855
PO BOX 856, SALINA, OK 74365-0856
PO BOX 857, SALINA, OK 74365-0857
PO BOX 858, SALINA, OK 74365-0858
PO BOX 859, SALINA, OK 74365-0859
PO BOX 860, SALINA, OK 74365-0860
PO BOX 861, SALINA, OK 74365-0861
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