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 861, ELK GROVE VILLAGE, IL 60009-0861
PO BOX 862, ELK GROVE VILLAGE, IL 60009-0862
PO BOX 863, ELK GROVE VILLAGE, IL 60009-0863
PO BOX 864, ELK GROVE VILLAGE, IL 60009-0864
PO BOX 865, ELK GROVE VILLAGE, IL 60009-0865
PO BOX 866, ELK GROVE VILLAGE, IL 60009-0866
PO BOX 867, ELK GROVE VILLAGE, IL 60009-0867
PO BOX 868, ELK GROVE VILLAGE, IL 60009-0868
PO BOX 869, ELK GROVE VILLAGE, IL 60009-0869
PO BOX 870, ELK GROVE VILLAGE, IL 60009-0870
PO BOX 871, ELK GROVE VILLAGE, IL 60009-0871
PO BOX 872, ELK GROVE VILLAGE, IL 60009-0872
PO BOX 873, ELK GROVE VILLAGE, IL 60009-0873
PO BOX 874, ELK GROVE VILLAGE, IL 60009-0874
PO BOX 875, ELK GROVE VILLAGE, IL 60009-0875
PO BOX 876, ELK GROVE VILLAGE, IL 60009-0876
PO BOX 877, ELK GROVE VILLAGE, IL 60009-0877
PO BOX 878, ELK GROVE VILLAGE, IL 60009-0878
PO BOX 879, ELK GROVE VILLAGE, IL 60009-0879
PO BOX 880, ELK GROVE VILLAGE, IL 60009-0880
PO BOX 881, ELK GROVE VILLAGE, IL 60009-0881
PO BOX 882, ELK GROVE VILLAGE, IL 60009-0882
PO BOX 883, ELK GROVE VILLAGE, IL 60009-0883
PO BOX 884, ELK GROVE VILLAGE, IL 60009-0884
PO BOX 885, ELK GROVE VILLAGE, IL 60009-0885
PO BOX 886, ELK GROVE VILLAGE, IL 60009-0886
PO BOX 887, ELK GROVE VILLAGE, IL 60009-0887
PO BOX 888, ELK GROVE VILLAGE, IL 60009-0888
PO BOX 889, ELK GROVE VILLAGE, IL 60009-0889
PO BOX 890, ELK GROVE VILLAGE, IL 60009-0890
PO BOX 891, ELK GROVE VILLAGE, IL 60009-0891
PO BOX 892, ELK GROVE VILLAGE, IL 60009-0892
PO BOX 893, ELK GROVE VILLAGE, IL 60009-0893
PO BOX 894, ELK GROVE VILLAGE, IL 60009-0894
PO BOX 895, ELK GROVE VILLAGE, IL 60009-0895
PO BOX 896, ELK GROVE VILLAGE, IL 60009-0896
PO BOX 897, ELK GROVE VILLAGE, IL 60009-0897
PO BOX 898, ELK GROVE VILLAGE, IL 60009-0898
PO BOX 899, ELK GROVE VILLAGE, IL 60009-0899
PO BOX 900, ELK GROVE VILLAGE, IL 60009-0900
PO BOX 901, ELK GROVE VILLAGE, IL 60009-0901
PO BOX 902, ELK GROVE VILLAGE, IL 60009-0902
PO BOX 903, ELK GROVE VILLAGE, IL 60009-0903
PO BOX 904, ELK GROVE VILLAGE, IL 60009-0904
PO BOX 905, ELK GROVE VILLAGE, IL 60009-0905
PO BOX 906, ELK GROVE VILLAGE, IL 60009-0906
PO BOX 907, ELK GROVE VILLAGE, IL 60009-0907
PO BOX 908, ELK GROVE VILLAGE, IL 60009-0908
PO BOX 909, ELK GROVE VILLAGE, IL 60009-0909
PO BOX 910, ELK GROVE VILLAGE, IL 60009-0910
PO BOX 911, ELK GROVE VILLAGE, IL 60009-0911
PO BOX 912, ELK GROVE VILLAGE, IL 60009-0912
PO BOX 913, ELK GROVE VILLAGE, IL 60009-0913
PO BOX 914, ELK GROVE VILLAGE, IL 60009-0914
PO BOX 915, ELK GROVE VILLAGE, IL 60009-0915
PO BOX 916, ELK GROVE VILLAGE, IL 60009-0916
PO BOX 917, ELK GROVE VILLAGE, IL 60009-0917
PO BOX 918, ELK GROVE VILLAGE, IL 60009-0918
PO BOX 919, ELK GROVE VILLAGE, IL 60009-0919
PO BOX 920, ELK GROVE VILLAGE, IL 60009-0920
PO BOX 921, ELK GROVE VILLAGE, IL 60009-0921
PO BOX 922, ELK GROVE VILLAGE, IL 60009-0922
PO BOX 923, ELK GROVE VILLAGE, IL 60009-0923
PO BOX 924, ELK GROVE VILLAGE, IL 60009-0924
PO BOX 925, ELK GROVE VILLAGE, IL 60009-0925
PO BOX 926, ELK GROVE VILLAGE, IL 60009-0926
PO BOX 927, ELK GROVE VILLAGE, IL 60009-0927
PO BOX 928, ELK GROVE VILLAGE, IL 60009-0928
PO BOX 929, ELK GROVE VILLAGE, IL 60009-0929
PO BOX 930, ELK GROVE VILLAGE, IL 60009-0930
PO BOX 931, ELK GROVE VILLAGE, IL 60009-0931
PO BOX 932, ELK GROVE VILLAGE, IL 60009-0932
PO BOX 933, ELK GROVE VILLAGE, IL 60009-0933
PO BOX 934, ELK GROVE VILLAGE, IL 60009-0934
PO BOX 935, ELK GROVE VILLAGE, IL 60009-0935
PO BOX 936, ELK GROVE VILLAGE, IL 60009-0936
PO BOX 937, ELK GROVE VILLAGE, IL 60009-0937
PO BOX 938, ELK GROVE VILLAGE, IL 60009-0938
PO BOX 939, ELK GROVE VILLAGE, IL 60009-0939
PO BOX 940, ELK GROVE VILLAGE, IL 60009-0940
PO BOX 941, ELK GROVE VILLAGE, IL 60009-0941
PO BOX 942, ELK GROVE VILLAGE, IL 60009-0942
PO BOX 943, ELK GROVE VILLAGE, IL 60009-0943
PO BOX 944, ELK GROVE VILLAGE, IL 60009-0944
PO BOX 945, ELK GROVE VILLAGE, IL 60009-0945
PO BOX 946, ELK GROVE VILLAGE, IL 60009-0946
PO BOX 947, ELK GROVE VILLAGE, IL 60009-0947
PO BOX 948, ELK GROVE VILLAGE, IL 60009-0948
PO BOX 949, ELK GROVE VILLAGE, IL 60009-0949
PO BOX 950, ELK GROVE VILLAGE, IL 60009-0950
PO BOX 951, ELK GROVE VILLAGE, IL 60009-0951
PO BOX 952, ELK GROVE VILLAGE, IL 60009-0952
PO BOX 953, ELK GROVE VILLAGE, IL 60009-0953
PO BOX 954, ELK GROVE VILLAGE, IL 60009-0954
PO BOX 955, ELK GROVE VILLAGE, IL 60009-0955
PO BOX 956, ELK GROVE VILLAGE, IL 60009-0956
PO BOX 957, ELK GROVE VILLAGE, IL 60009-0957
PO BOX 958, ELK GROVE VILLAGE, IL 60009-0958
PO BOX 959, ELK GROVE VILLAGE, IL 60009-0959
PO BOX 960, ELK GROVE VILLAGE, IL 60009-0960
PO BOX 961, ELK GROVE VILLAGE, IL 60009-0961
PO BOX 962, ELK GROVE VILLAGE, IL 60009-0962
PO BOX 963, ELK GROVE VILLAGE, IL 60009-0963
PO BOX 964, ELK GROVE VILLAGE, IL 60009-0964
PO BOX 965, ELK GROVE VILLAGE, IL 60009-0965
PO BOX 966, ELK GROVE VILLAGE, IL 60009-0966
PO BOX 967, ELK GROVE VILLAGE, IL 60009-0967
PO BOX 968, ELK GROVE VILLAGE, IL 60009-0968
PO BOX 969, ELK GROVE VILLAGE, IL 60009-0969
PO BOX 970, ELK GROVE VILLAGE, IL 60009-0970
PO BOX 971, ELK GROVE VILLAGE, IL 60009-0971
PO BOX 972, ELK GROVE VILLAGE, IL 60009-0972
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