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, CHAPEL HILL, NC 27514-0821
PO BOX 822, CHAPEL HILL, NC 27514-0822
PO BOX 823, CHAPEL HILL, NC 27514-0823
PO BOX 824, CHAPEL HILL, NC 27514-0824
PO BOX 825, CHAPEL HILL, NC 27514-0825
PO BOX 826, CHAPEL HILL, NC 27514-0826
PO BOX 827, CHAPEL HILL, NC 27514-0827
PO BOX 828, CHAPEL HILL, NC 27514-0828
PO BOX 829, CHAPEL HILL, NC 27514-0829
PO BOX 830, CHAPEL HILL, NC 27514-0830
PO BOX 831, CHAPEL HILL, NC 27514-0831
PO BOX 832, CHAPEL HILL, NC 27514-0832
PO BOX 833, CHAPEL HILL, NC 27514-0833
PO BOX 834, CHAPEL HILL, NC 27514-0834
PO BOX 835, CHAPEL HILL, NC 27514-0835
PO BOX 836, CHAPEL HILL, NC 27514-0836
PO BOX 837, CHAPEL HILL, NC 27514-0837
PO BOX 838, CHAPEL HILL, NC 27514-0838
PO BOX 839, CHAPEL HILL, NC 27514-0839
PO BOX 840, CHAPEL HILL, NC 27514-0840
PO BOX 841, CHAPEL HILL, NC 27514-0841
PO BOX 842, CHAPEL HILL, NC 27514-0842
PO BOX 843, CHAPEL HILL, NC 27514-0843
PO BOX 844, CHAPEL HILL, NC 27514-0844
PO BOX 845, CHAPEL HILL, NC 27514-0845
PO BOX 846, CHAPEL HILL, NC 27514-0846
PO BOX 847, CHAPEL HILL, NC 27514-0847
PO BOX 848, CHAPEL HILL, NC 27514-0848
PO BOX 849, CHAPEL HILL, NC 27514-0849
PO BOX 850, CHAPEL HILL, NC 27514-0850
PO BOX 851, CHAPEL HILL, NC 27514-0851
PO BOX 852, CHAPEL HILL, NC 27514-0852
PO BOX 853, CHAPEL HILL, NC 27514-0853
PO BOX 854, CHAPEL HILL, NC 27514-0854
PO BOX 855, CHAPEL HILL, NC 27514-0855
PO BOX 856, CHAPEL HILL, NC 27514-0856
PO BOX 857, CHAPEL HILL, NC 27514-0857
PO BOX 858, CHAPEL HILL, NC 27514-0858
PO BOX 859, CHAPEL HILL, NC 27514-0859
PO BOX 860, CHAPEL HILL, NC 27514-0860
PO BOX 861, CHAPEL HILL, NC 27514-0861
PO BOX 862, CHAPEL HILL, NC 27514-0862
PO BOX 863, CHAPEL HILL, NC 27514-0863
PO BOX 864, CHAPEL HILL, NC 27514-0864
PO BOX 865, CHAPEL HILL, NC 27514-0865
PO BOX 866, CHAPEL HILL, NC 27514-0866
PO BOX 867, CHAPEL HILL, NC 27514-0867
PO BOX 868, CHAPEL HILL, NC 27514-0868
PO BOX 869, CHAPEL HILL, NC 27514-0869
PO BOX 870, CHAPEL HILL, NC 27514-0870
PO BOX 871, CHAPEL HILL, NC 27514-0871
PO BOX 872, CHAPEL HILL, NC 27514-0872
PO BOX 873, CHAPEL HILL, NC 27514-0873
PO BOX 874, CHAPEL HILL, NC 27514-0874
PO BOX 875, CHAPEL HILL, NC 27514-0875
PO BOX 876, CHAPEL HILL, NC 27514-0876
PO BOX 877, CHAPEL HILL, NC 27514-0877
PO BOX 878, CHAPEL HILL, NC 27514-0878
PO BOX 879, CHAPEL HILL, NC 27514-0879
PO BOX 880, CHAPEL HILL, NC 27514-0880
PO BOX 881, CHAPEL HILL, NC 27514-0881
PO BOX 882, CHAPEL HILL, NC 27514-0882
PO BOX 883, CHAPEL HILL, NC 27514-0883
PO BOX 884, CHAPEL HILL, NC 27514-0884
PO BOX 885, CHAPEL HILL, NC 27514-0885
PO BOX 886, CHAPEL HILL, NC 27514-0886
PO BOX 887, CHAPEL HILL, NC 27514-0887
PO BOX 888, CHAPEL HILL, NC 27514-0888
PO BOX 889, CHAPEL HILL, NC 27514-0889
PO BOX 890, CHAPEL HILL, NC 27514-0890
PO BOX 891, CHAPEL HILL, NC 27514-0891
PO BOX 892, CHAPEL HILL, NC 27514-0892
PO BOX 893, CHAPEL HILL, NC 27514-0893
PO BOX 894, CHAPEL HILL, NC 27514-0894
PO BOX 895, CHAPEL HILL, NC 27514-0895
PO BOX 896, CHAPEL HILL, NC 27514-0896
PO BOX 897, CHAPEL HILL, NC 27514-0897
PO BOX 898, CHAPEL HILL, NC 27514-0898
PO BOX 899, CHAPEL HILL, NC 27514-0899
PO BOX 900, CHAPEL HILL, NC 27514-0900
PO BOX 901, CHAPEL HILL, NC 27514-0901
PO BOX 902, CHAPEL HILL, NC 27514-0902
PO BOX 903, CHAPEL HILL, NC 27514-0903
PO BOX 904, CHAPEL HILL, NC 27514-0904
PO BOX 905, CHAPEL HILL, NC 27514-0905
PO BOX 906, CHAPEL HILL, NC 27514-0906
PO BOX 907, CHAPEL HILL, NC 27514-0907
PO BOX 908, CHAPEL HILL, NC 27514-0908
PO BOX 909, CHAPEL HILL, NC 27514-0909
PO BOX 910, CHAPEL HILL, NC 27514-0910
PO BOX 911, CHAPEL HILL, NC 27514-0911
PO BOX 912, CHAPEL HILL, NC 27514-0912
PO BOX 913, CHAPEL HILL, NC 27514-0913
PO BOX 914, CHAPEL HILL, NC 27514-0914
PO BOX 915, CHAPEL HILL, NC 27514-0915
PO BOX 916, CHAPEL HILL, NC 27514-0916
PO BOX 917, CHAPEL HILL, NC 27514-0917
PO BOX 918, CHAPEL HILL, NC 27514-0918
PO BOX 919, CHAPEL HILL, NC 27514-0919
PO BOX 920, CHAPEL HILL, NC 27514-0920
PO BOX 921, CHAPEL HILL, NC 27514-0921
PO BOX 922, CHAPEL HILL, NC 27514-0922
PO BOX 923, CHAPEL HILL, NC 27514-0923
PO BOX 924, CHAPEL HILL, NC 27514-0924
PO BOX 925, CHAPEL HILL, NC 27514-0925
PO BOX 926, CHAPEL HILL, NC 27514-0926
PO BOX 927, CHAPEL HILL, NC 27514-0927
PO BOX 928, CHAPEL HILL, NC 27514-0928
PO BOX 929, CHAPEL HILL, NC 27514-0929
PO BOX 930, CHAPEL HILL, NC 27514-0930
PO BOX 931, CHAPEL HILL, NC 27514-0931
PO BOX 932, CHAPEL HILL, NC 27514-0932
PO BOX 933, CHAPEL HILL, NC 27514-0933
PO BOX 934, CHAPEL HILL, NC 27514-0934
PO BOX 935, CHAPEL HILL, NC 27514-0935
PO BOX 936, CHAPEL HILL, NC 27514-0936
PO BOX 937, CHAPEL HILL, NC 27514-0937
PO BOX 938, CHAPEL HILL, NC 27514-0938
PO BOX 939, CHAPEL HILL, NC 27514-0939
PO BOX 940, CHAPEL HILL, NC 27514-0940
PO BOX 941, CHAPEL HILL, NC 27514-0941
PO BOX 942, CHAPEL HILL, NC 27514-0942
PO BOX 943, CHAPEL HILL, NC 27514-0943
PO BOX 944, CHAPEL HILL, NC 27514-0944
PO BOX 945, CHAPEL HILL, NC 27514-0945
PO BOX 946, CHAPEL HILL, NC 27514-0946
PO BOX 947, CHAPEL HILL, NC 27514-0947
PO BOX 948, CHAPEL HILL, NC 27514-0948
PO BOX 949, CHAPEL HILL, NC 27514-0949
PO BOX 950, CHAPEL HILL, NC 27514-0950
PO BOX 951, CHAPEL HILL, NC 27514-0951
PO BOX 952, CHAPEL HILL, NC 27514-0952
PO BOX 953, CHAPEL HILL, NC 27514-0953
PO BOX 954, CHAPEL HILL, NC 27514-0954
PO BOX 955, CHAPEL HILL, NC 27514-0955
PO BOX 956, CHAPEL HILL, NC 27514-0956
PO BOX 957, CHAPEL HILL, NC 27514-0957
PO BOX 958, CHAPEL HILL, NC 27514-0958
PO BOX 959, CHAPEL HILL, NC 27514-0959
PO BOX 960, CHAPEL HILL, NC 27514-0960
PO BOX 961, CHAPEL HILL, NC 27514-0961
PO BOX 962, CHAPEL HILL, NC 27514-0962
PO BOX 963, CHAPEL HILL, NC 27514-0963
PO BOX 964, CHAPEL HILL, NC 27514-0964
PO BOX 965, CHAPEL HILL, NC 27514-0965
PO BOX 966, CHAPEL HILL, NC 27514-0966
PO BOX 967, CHAPEL HILL, NC 27514-0967
PO BOX 968, CHAPEL HILL, NC 27514-0968
PO BOX 969, CHAPEL HILL, NC 27514-0969
PO BOX 970, CHAPEL HILL, NC 27514-0970
PO BOX 971, CHAPEL HILL, NC 27514-0971
PO BOX 972, CHAPEL HILL, NC 27514-0972
PO BOX 973, CHAPEL HILL, NC 27514-0973
PO BOX 974, CHAPEL HILL, NC 27514-0974
PO BOX 975, CHAPEL HILL, NC 27514-0975
PO BOX 976, CHAPEL HILL, NC 27514-0976
PO BOX 977, CHAPEL HILL, NC 27514-0977
PO BOX 978, CHAPEL HILL, NC 27514-0978
PO BOX 979, CHAPEL HILL, NC 27514-0979
PO BOX 980, CHAPEL HILL, NC 27514-0980
PO BOX 981, CHAPEL HILL, NC 27514-0981
PO BOX 982, CHAPEL HILL, NC 27514-0982
PO BOX 983, CHAPEL HILL, NC 27514-0983
PO BOX 984, CHAPEL HILL, NC 27514-0984
PO BOX 985, CHAPEL HILL, NC 27514-0985
PO BOX 986, CHAPEL HILL, NC 27514-0986
PO BOX 987, CHAPEL HILL, NC 27514-0987
PO BOX 988, CHAPEL HILL, NC 27514-0988
PO BOX 989, CHAPEL HILL, NC 27514-0989
PO BOX 990, CHAPEL HILL, NC 27514-0990
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