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 821, SPARTANBURG, SC 29304-0821
PO BOX 822, SPARTANBURG, SC 29304-0822
PO BOX 823, SPARTANBURG, SC 29304-0823
PO BOX 824, SPARTANBURG, SC 29304-0824
PO BOX 825, SPARTANBURG, SC 29304-0825
PO BOX 826, SPARTANBURG, SC 29304-0826
PO BOX 827, SPARTANBURG, SC 29304-0827
PO BOX 828, SPARTANBURG, SC 29304-0828
PO BOX 829, SPARTANBURG, SC 29304-0829
PO BOX 830, SPARTANBURG, SC 29304-0830
PO BOX 831, SPARTANBURG, SC 29304-0831
PO BOX 832, SPARTANBURG, SC 29304-0832
PO BOX 833, SPARTANBURG, SC 29304-0833
PO BOX 834, SPARTANBURG, SC 29304-0834
PO BOX 835, SPARTANBURG, SC 29304-0835
PO BOX 836, SPARTANBURG, SC 29304-0836
PO BOX 837, SPARTANBURG, SC 29304-0837
PO BOX 838, SPARTANBURG, SC 29304-0838
PO BOX 839, SPARTANBURG, SC 29304-0839
PO BOX 840, SPARTANBURG, SC 29304-0840
PO BOX 841, SPARTANBURG, SC 29304-0841
PO BOX 842, SPARTANBURG, SC 29304-0842
PO BOX 843, SPARTANBURG, SC 29304-0843
PO BOX 844, SPARTANBURG, SC 29304-0844
PO BOX 845, SPARTANBURG, SC 29304-0845
PO BOX 846, SPARTANBURG, SC 29304-0846
PO BOX 847, SPARTANBURG, SC 29304-0847
PO BOX 848, SPARTANBURG, SC 29304-0848
PO BOX 849, SPARTANBURG, SC 29304-0849
PO BOX 850, SPARTANBURG, SC 29304-0850
PO BOX 851, SPARTANBURG, SC 29304-0851
PO BOX 852, SPARTANBURG, SC 29304-0852
PO BOX 853, SPARTANBURG, SC 29304-0853
PO BOX 854, SPARTANBURG, SC 29304-0854
PO BOX 855, SPARTANBURG, SC 29304-0855
PO BOX 856, SPARTANBURG, SC 29304-0856
PO BOX 857, SPARTANBURG, SC 29304-0857
PO BOX 858, SPARTANBURG, SC 29304-0858
PO BOX 859, SPARTANBURG, SC 29304-0859
PO BOX 860, SPARTANBURG, SC 29304-0860
PO BOX 861, SPARTANBURG, SC 29304-0861
PO BOX 862, SPARTANBURG, SC 29304-0862
PO BOX 863, SPARTANBURG, SC 29304-0863
PO BOX 864, SPARTANBURG, SC 29304-0864
PO BOX 865, SPARTANBURG, SC 29304-0865
PO BOX 866, SPARTANBURG, SC 29304-0866
PO BOX 867, SPARTANBURG, SC 29304-0867
PO BOX 868, SPARTANBURG, SC 29304-0868
PO BOX 869, SPARTANBURG, SC 29304-0869
PO BOX 870, SPARTANBURG, SC 29304-0870
PO BOX 871, SPARTANBURG, SC 29304-0871
PO BOX 872, SPARTANBURG, SC 29304-0872
PO BOX 873, SPARTANBURG, SC 29304-0873
PO BOX 874, SPARTANBURG, SC 29304-0874
PO BOX 875, SPARTANBURG, SC 29304-0875
PO BOX 876, SPARTANBURG, SC 29304-0876
PO BOX 877, SPARTANBURG, SC 29304-0877
PO BOX 878, SPARTANBURG, SC 29304-0878
PO BOX 879, SPARTANBURG, SC 29304-0879
PO BOX 880, SPARTANBURG, SC 29304-0880
PO BOX 881, SPARTANBURG, SC 29304-0881
PO BOX 882, SPARTANBURG, SC 29304-0882
PO BOX 883, SPARTANBURG, SC 29304-0883
PO BOX 884, SPARTANBURG, SC 29304-0884
PO BOX 885, SPARTANBURG, SC 29304-0885
PO BOX 886, SPARTANBURG, SC 29304-0886
PO BOX 887, SPARTANBURG, SC 29304-0887
PO BOX 888, SPARTANBURG, SC 29304-0888
PO BOX 889, SPARTANBURG, SC 29304-0889
PO BOX 890, SPARTANBURG, SC 29304-0890
PO BOX 891, SPARTANBURG, SC 29304-0891
PO BOX 892, SPARTANBURG, SC 29304-0892
PO BOX 893, SPARTANBURG, SC 29304-0893
PO BOX 894, SPARTANBURG, SC 29304-0894
PO BOX 895, SPARTANBURG, SC 29304-0895
PO BOX 896, SPARTANBURG, SC 29304-0896
PO BOX 897, SPARTANBURG, SC 29304-0897
PO BOX 898, SPARTANBURG, SC 29304-0898
PO BOX 899, SPARTANBURG, SC 29304-0899
PO BOX 900, SPARTANBURG, SC 29304-0900
PO BOX 901, SPARTANBURG, SC 29304-0901
PO BOX 902, SPARTANBURG, SC 29304-0902
PO BOX 903, SPARTANBURG, SC 29304-0903
PO BOX 904, SPARTANBURG, SC 29304-0904
PO BOX 905, SPARTANBURG, SC 29304-0905
PO BOX 906, SPARTANBURG, SC 29304-0906
PO BOX 907, SPARTANBURG, SC 29304-0907
PO BOX 908, SPARTANBURG, SC 29304-0908
PO BOX 909, SPARTANBURG, SC 29304-0909
PO BOX 910, SPARTANBURG, SC 29304-0910
PO BOX 911, SPARTANBURG, SC 29304-0911
PO BOX 912, SPARTANBURG, SC 29304-0912
PO BOX 913, SPARTANBURG, SC 29304-0913
PO BOX 914, SPARTANBURG, SC 29304-0914
PO BOX 915, SPARTANBURG, SC 29304-0915
PO BOX 916, SPARTANBURG, SC 29304-0916
PO BOX 917, SPARTANBURG, SC 29304-0917
PO BOX 918, SPARTANBURG, SC 29304-0918
PO BOX 919, SPARTANBURG, SC 29304-0919
PO BOX 920, SPARTANBURG, SC 29304-0920
PO BOX 921, SPARTANBURG, SC 29304-0921
PO BOX 922, SPARTANBURG, SC 29304-0922
PO BOX 923, SPARTANBURG, SC 29304-0923
PO BOX 924, SPARTANBURG, SC 29304-0924
PO BOX 925, SPARTANBURG, SC 29304-0925
PO BOX 926, SPARTANBURG, SC 29304-0926
PO BOX 927, SPARTANBURG, SC 29304-0927
PO BOX 928, SPARTANBURG, SC 29304-0928
PO BOX 929, SPARTANBURG, SC 29304-0929
PO BOX 930, SPARTANBURG, SC 29304-0930
PO BOX 931, SPARTANBURG, SC 29304-0931
PO BOX 932, SPARTANBURG, SC 29304-0932
PO BOX 933, SPARTANBURG, SC 29304-0933
PO BOX 934, SPARTANBURG, SC 29304-0934
PO BOX 935, SPARTANBURG, SC 29304-0935
PO BOX 936, SPARTANBURG, SC 29304-0936
PO BOX 937, SPARTANBURG, SC 29304-0937
PO BOX 938, SPARTANBURG, SC 29304-0938
PO BOX 939, SPARTANBURG, SC 29304-0939
PO BOX 940, SPARTANBURG, SC 29304-0940
PO BOX 941, SPARTANBURG, SC 29304-0941
PO BOX 942, SPARTANBURG, SC 29304-0942
PO BOX 943, SPARTANBURG, SC 29304-0943
PO BOX 944, SPARTANBURG, SC 29304-0944
PO BOX 945, SPARTANBURG, SC 29304-0945
PO BOX 946, SPARTANBURG, SC 29304-0946
PO BOX 947, SPARTANBURG, SC 29304-0947
PO BOX 948, SPARTANBURG, SC 29304-0948
PO BOX 949, SPARTANBURG, SC 29304-0949
PO BOX 950, SPARTANBURG, SC 29304-0950
PO BOX 951, SPARTANBURG, SC 29304-0951
PO BOX 952, SPARTANBURG, SC 29304-0952
PO BOX 953, SPARTANBURG, SC 29304-0953
PO BOX 954, SPARTANBURG, SC 29304-0954
PO BOX 955, SPARTANBURG, SC 29304-0955
PO BOX 956, SPARTANBURG, SC 29304-0956
PO BOX 957, SPARTANBURG, SC 29304-0957
PO BOX 958, SPARTANBURG, SC 29304-0958
PO BOX 959, SPARTANBURG, SC 29304-0959
PO BOX 960, SPARTANBURG, SC 29304-0960
PO BOX 961, SPARTANBURG, SC 29304-0961
PO BOX 962, SPARTANBURG, SC 29304-0962
PO BOX 963, SPARTANBURG, SC 29304-0963
PO BOX 964, SPARTANBURG, SC 29304-0964
PO BOX 965, SPARTANBURG, SC 29304-0965
PO BOX 966, SPARTANBURG, SC 29304-0966
PO BOX 967, SPARTANBURG, SC 29304-0967
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