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 901, CHRISTIANSBURG, VA 24068-0901
PO BOX 902, CHRISTIANSBURG, VA 24068-0902
PO BOX 903, CHRISTIANSBURG, VA 24068-0903
PO BOX 904, CHRISTIANSBURG, VA 24068-0904
PO BOX 905, CHRISTIANSBURG, VA 24068-0905
PO BOX 906, CHRISTIANSBURG, VA 24068-0906
PO BOX 907, CHRISTIANSBURG, VA 24068-0907
PO BOX 908, CHRISTIANSBURG, VA 24068-0908
PO BOX 909, CHRISTIANSBURG, VA 24068-0909
PO BOX 910, CHRISTIANSBURG, VA 24068-0910
PO BOX 911, CHRISTIANSBURG, VA 24068-0911
PO BOX 912, CHRISTIANSBURG, VA 24068-0912
PO BOX 913, CHRISTIANSBURG, VA 24068-0913
PO BOX 914, CHRISTIANSBURG, VA 24068-0914
PO BOX 915, CHRISTIANSBURG, VA 24068-0915
PO BOX 916, CHRISTIANSBURG, VA 24068-0916
PO BOX 917, CHRISTIANSBURG, VA 24068-0917
PO BOX 918, CHRISTIANSBURG, VA 24068-0918
PO BOX 919, CHRISTIANSBURG, VA 24068-0919
PO BOX 920, CHRISTIANSBURG, VA 24068-0920
PO BOX 921, CHRISTIANSBURG, VA 24068-0921
PO BOX 922, CHRISTIANSBURG, VA 24068-0922
PO BOX 923, CHRISTIANSBURG, VA 24068-0923
PO BOX 924, CHRISTIANSBURG, VA 24068-0924
PO BOX 925, CHRISTIANSBURG, VA 24068-0925
PO BOX 926, CHRISTIANSBURG, VA 24068-0926
PO BOX 927, CHRISTIANSBURG, VA 24068-0927
PO BOX 928, CHRISTIANSBURG, VA 24068-0928
PO BOX 929, CHRISTIANSBURG, VA 24068-0929
PO BOX 930, CHRISTIANSBURG, VA 24068-0930
PO BOX 931, CHRISTIANSBURG, VA 24068-0931
PO BOX 932, CHRISTIANSBURG, VA 24068-0932
PO BOX 933, CHRISTIANSBURG, VA 24068-0933
PO BOX 934, CHRISTIANSBURG, VA 24068-0934
PO BOX 935, CHRISTIANSBURG, VA 24068-0935
PO BOX 936, CHRISTIANSBURG, VA 24068-0936
PO BOX 937, CHRISTIANSBURG, VA 24068-0937
PO BOX 938, CHRISTIANSBURG, VA 24068-0938
PO BOX 939, CHRISTIANSBURG, VA 24068-0939
PO BOX 940, CHRISTIANSBURG, VA 24068-0940
PO BOX 941, CHRISTIANSBURG, VA 24068-0941
PO BOX 942, CHRISTIANSBURG, VA 24068-0942
PO BOX 943, CHRISTIANSBURG, VA 24068-0943
PO BOX 944, CHRISTIANSBURG, VA 24068-0944
PO BOX 945, CHRISTIANSBURG, VA 24068-0945
PO BOX 946, CHRISTIANSBURG, VA 24068-0946
PO BOX 947, CHRISTIANSBURG, VA 24068-0947
PO BOX 948, CHRISTIANSBURG, VA 24068-0948
PO BOX 949, CHRISTIANSBURG, VA 24068-0949
PO BOX 950, CHRISTIANSBURG, VA 24068-0950
PO BOX 951, CHRISTIANSBURG, VA 24068-0951
PO BOX 952, CHRISTIANSBURG, VA 24068-0952
PO BOX 953, CHRISTIANSBURG, VA 24068-0953
PO BOX 954, CHRISTIANSBURG, VA 24068-0954
PO BOX 955, CHRISTIANSBURG, VA 24068-0955
PO BOX 956, CHRISTIANSBURG, VA 24068-0956
PO BOX 957, CHRISTIANSBURG, VA 24068-0957
PO BOX 958, CHRISTIANSBURG, VA 24068-0958
PO BOX 959, CHRISTIANSBURG, VA 24068-0959
PO BOX 960, CHRISTIANSBURG, VA 24068-0960
PO BOX 961, CHRISTIANSBURG, VA 24068-0961
PO BOX 962, CHRISTIANSBURG, VA 24068-0962
PO BOX 963, CHRISTIANSBURG, VA 24068-0963
PO BOX 964, CHRISTIANSBURG, VA 24068-0964
PO BOX 965, CHRISTIANSBURG, VA 24068-0965
PO BOX 966, CHRISTIANSBURG, VA 24068-0966
PO BOX 967, CHRISTIANSBURG, VA 24068-0967
PO BOX 968, CHRISTIANSBURG, VA 24068-0968
PO BOX 969, CHRISTIANSBURG, VA 24068-0969
PO BOX 970, CHRISTIANSBURG, VA 24068-0970
PO BOX 971, CHRISTIANSBURG, VA 24068-0971
PO BOX 972, CHRISTIANSBURG, VA 24068-0972
PO BOX 973, CHRISTIANSBURG, VA 24068-0973
PO BOX 974, CHRISTIANSBURG, VA 24068-0974
PO BOX 975, CHRISTIANSBURG, VA 24068-0975
PO BOX 976, CHRISTIANSBURG, VA 24068-0976
PO BOX 977, CHRISTIANSBURG, VA 24068-0977
PO BOX 978, CHRISTIANSBURG, VA 24068-0978
PO BOX 979, CHRISTIANSBURG, VA 24068-0979
PO BOX 980, CHRISTIANSBURG, VA 24068-0980
PO BOX 981, CHRISTIANSBURG, VA 24068-0981
PO BOX 982, CHRISTIANSBURG, VA 24068-0982
PO BOX 983, CHRISTIANSBURG, VA 24068-0983
PO BOX 984, CHRISTIANSBURG, VA 24068-0984
PO BOX 985, CHRISTIANSBURG, VA 24068-0985
PO BOX 986, CHRISTIANSBURG, VA 24068-0986
PO BOX 987, CHRISTIANSBURG, VA 24068-0987
PO BOX 988, CHRISTIANSBURG, VA 24068-0988
PO BOX 989, CHRISTIANSBURG, VA 24068-0989
PO BOX 990, CHRISTIANSBURG, VA 24068-0990
PO BOX 991, CHRISTIANSBURG, VA 24068-0991
PO BOX 992, CHRISTIANSBURG, VA 24068-0992
PO BOX 993, CHRISTIANSBURG, VA 24068-0993
PO BOX 994, CHRISTIANSBURG, VA 24068-0994
PO BOX 995, CHRISTIANSBURG, VA 24068-0995
PO BOX 996, CHRISTIANSBURG, VA 24068-0996
PO BOX 997, CHRISTIANSBURG, VA 24068-0997
PO BOX 998, CHRISTIANSBURG, VA 24068-0998
PO BOX 999, CHRISTIANSBURG, VA 24068-0999
PO BOX 1000, CHRISTIANSBURG, VA 24068-1000
PO BOX 1001, CHRISTIANSBURG, VA 24068-1001
PO BOX 1002, CHRISTIANSBURG, VA 24068-1002
PO BOX 1003, CHRISTIANSBURG, VA 24068-1003
PO BOX 1004, CHRISTIANSBURG, VA 24068-1004
PO BOX 1005, CHRISTIANSBURG, VA 24068-1005
PO BOX 1006, CHRISTIANSBURG, VA 24068-1006
PO BOX 1007, CHRISTIANSBURG, VA 24068-1007
PO BOX 1008, CHRISTIANSBURG, VA 24068-1008
PO BOX 1009, CHRISTIANSBURG, VA 24068-1009
PO BOX 1010, CHRISTIANSBURG, VA 24068-1010
PO BOX 1011, CHRISTIANSBURG, VA 24068-1011
PO BOX 1012, CHRISTIANSBURG, VA 24068-1012
PO BOX 1013, CHRISTIANSBURG, VA 24068-1013
PO BOX 1014, CHRISTIANSBURG, VA 24068-1014
PO BOX 1015, CHRISTIANSBURG, VA 24068-1015
PO BOX 1016, CHRISTIANSBURG, VA 24068-1016
PO BOX 1017, CHRISTIANSBURG, VA 24068-1017
PO BOX 1018, CHRISTIANSBURG, VA 24068-1018
PO BOX 1019, CHRISTIANSBURG, VA 24068-1019
PO BOX 1020, CHRISTIANSBURG, VA 24068-1020
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