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 801, SANFORD, ME 04073-0801
PO BOX 802, SANFORD, ME 04073-0802
PO BOX 803, SANFORD, ME 04073-0803
PO BOX 804, SANFORD, ME 04073-0804
PO BOX 805, SANFORD, ME 04073-0805
PO BOX 806, SANFORD, ME 04073-0806
PO BOX 807, SANFORD, ME 04073-0807
PO BOX 808, SANFORD, ME 04073-0808
PO BOX 809, SANFORD, ME 04073-0809
PO BOX 810, SANFORD, ME 04073-0810
PO BOX 811, SANFORD, ME 04073-0811
PO BOX 812, SANFORD, ME 04073-0812
PO BOX 813, SANFORD, ME 04073-0813
PO BOX 814, SANFORD, ME 04073-0814
PO BOX 815, SANFORD, ME 04073-0815
PO BOX 816, SANFORD, ME 04073-0816
PO BOX 817, SANFORD, ME 04073-0817
PO BOX 818, SANFORD, ME 04073-0818
PO BOX 819, SANFORD, ME 04073-0819
PO BOX 820, SANFORD, ME 04073-0820
PO BOX 821, SANFORD, ME 04073-0821
PO BOX 822, SANFORD, ME 04073-0822
PO BOX 823, SANFORD, ME 04073-0823
PO BOX 824, SANFORD, ME 04073-0824
PO BOX 825, SANFORD, ME 04073-0825
PO BOX 826, SANFORD, ME 04073-0826
PO BOX 827, SANFORD, ME 04073-0827
PO BOX 828, SANFORD, ME 04073-0828
PO BOX 829, SANFORD, ME 04073-0829
PO BOX 830, SANFORD, ME 04073-0830
PO BOX 831, SANFORD, ME 04073-0831
PO BOX 832, SANFORD, ME 04073-0832
PO BOX 833, SANFORD, ME 04073-0833
PO BOX 834, SANFORD, ME 04073-0834
PO BOX 835, SANFORD, ME 04073-0835
PO BOX 836, SANFORD, ME 04073-0836
PO BOX 837, SANFORD, ME 04073-0837
PO BOX 838, SANFORD, ME 04073-0838
PO BOX 839, SANFORD, ME 04073-0839
PO BOX 840, SANFORD, ME 04073-0840
PO BOX 841, SANFORD, ME 04073-0841
PO BOX 842, SANFORD, ME 04073-0842
PO BOX 843, SANFORD, ME 04073-0843
PO BOX 844, SANFORD, ME 04073-0844
PO BOX 845, SANFORD, ME 04073-0845
PO BOX 846, SANFORD, ME 04073-0846
PO BOX 847, SANFORD, ME 04073-0847
PO BOX 848, SANFORD, ME 04073-0848
PO BOX 849, SANFORD, ME 04073-0849
PO BOX 850, SANFORD, ME 04073-0850
PO BOX 851, SANFORD, ME 04073-0851
PO BOX 852, SANFORD, ME 04073-0852
PO BOX 853, SANFORD, ME 04073-0853
PO BOX 854, SANFORD, ME 04073-0854
PO BOX 855, SANFORD, ME 04073-0855
PO BOX 856, SANFORD, ME 04073-0856
PO BOX 857, SANFORD, ME 04073-0857
PO BOX 858, SANFORD, ME 04073-0858
PO BOX 859, SANFORD, ME 04073-0859
PO BOX 860, SANFORD, ME 04073-0860
PO BOX 861, SANFORD, ME 04073-0861
PO BOX 862, SANFORD, ME 04073-0862
PO BOX 863, SANFORD, ME 04073-0863
PO BOX 864, SANFORD, ME 04073-0864
PO BOX 865, SANFORD, ME 04073-0865
PO BOX 866, SANFORD, ME 04073-0866
PO BOX 867, SANFORD, ME 04073-0867
PO BOX 868, SANFORD, ME 04073-0868
PO BOX 869, SANFORD, ME 04073-0869
PO BOX 870, SANFORD, ME 04073-0870
PO BOX 871, SANFORD, ME 04073-0871
PO BOX 872, SANFORD, ME 04073-0872
PO BOX 873, SANFORD, ME 04073-0873
PO BOX 874, SANFORD, ME 04073-0874
PO BOX 875, SANFORD, ME 04073-0875
PO BOX 876, SANFORD, ME 04073-0876
PO BOX 877, SANFORD, ME 04073-0877
PO BOX 878, SANFORD, ME 04073-0878
PO BOX 879, SANFORD, ME 04073-0879
PO BOX 880, SANFORD, ME 04073-0880
PO BOX 881, SANFORD, ME 04073-0881
PO BOX 882, SANFORD, ME 04073-0882
PO BOX 883, SANFORD, ME 04073-0883
PO BOX 884, SANFORD, ME 04073-0884
PO BOX 885, SANFORD, ME 04073-0885
PO BOX 886, SANFORD, ME 04073-0886
PO BOX 887, SANFORD, ME 04073-0887
PO BOX 888, SANFORD, ME 04073-0888
PO BOX 889, SANFORD, ME 04073-0889
PO BOX 890, SANFORD, ME 04073-0890
PO BOX 891, SANFORD, ME 04073-0891
PO BOX 892, SANFORD, ME 04073-0892
PO BOX 893, SANFORD, ME 04073-0893
PO BOX 894, SANFORD, ME 04073-0894
PO BOX 895, SANFORD, ME 04073-0895
PO BOX 896, SANFORD, ME 04073-0896
PO BOX 897, SANFORD, ME 04073-0897
PO BOX 898, SANFORD, ME 04073-0898
PO BOX 899, SANFORD, ME 04073-0899
PO BOX 900, SANFORD, ME 04073-0900
PO BOX 901, SANFORD, ME 04073-0901
PO BOX 902, SANFORD, ME 04073-0902
PO BOX 903, SANFORD, ME 04073-0903
PO BOX 904, SANFORD, ME 04073-0904
PO BOX 905, SANFORD, ME 04073-0905
PO BOX 906, SANFORD, ME 04073-0906
PO BOX 907, SANFORD, ME 04073-0907
PO BOX 908, SANFORD, ME 04073-0908
PO BOX 909, SANFORD, ME 04073-0909
PO BOX 910, SANFORD, ME 04073-0910
PO BOX 911, SANFORD, ME 04073-0911
PO BOX 912, SANFORD, ME 04073-0912
PO BOX 913, SANFORD, ME 04073-0913
PO BOX 914, SANFORD, ME 04073-0914
PO BOX 915, SANFORD, ME 04073-0915
PO BOX 916, SANFORD, ME 04073-0916
PO BOX 917, SANFORD, ME 04073-0917
PO BOX 918, SANFORD, ME 04073-0918
PO BOX 919, SANFORD, ME 04073-0919
PO BOX 920, SANFORD, ME 04073-0920
PO BOX 921, SANFORD, ME 04073-0921
PO BOX 922, SANFORD, ME 04073-0922
PO BOX 923, SANFORD, ME 04073-0923
PO BOX 924, SANFORD, ME 04073-0924
PO BOX 925, SANFORD, ME 04073-0925
PO BOX 926, SANFORD, ME 04073-0926
PO BOX 927, SANFORD, ME 04073-0927
PO BOX 928, SANFORD, ME 04073-0928
PO BOX 929, SANFORD, ME 04073-0929
PO BOX 930, SANFORD, ME 04073-0930
PO BOX 931, SANFORD, ME 04073-0931
PO BOX 932, SANFORD, ME 04073-0932
PO BOX 933, SANFORD, ME 04073-0933
PO BOX 934, SANFORD, ME 04073-0934
PO BOX 935, SANFORD, ME 04073-0935
PO BOX 936, SANFORD, ME 04073-0936
PO BOX 937, SANFORD, ME 04073-0937
PO BOX 938, SANFORD, ME 04073-0938
PO BOX 939, SANFORD, ME 04073-0939
PO BOX 940, SANFORD, ME 04073-0940
PO BOX 941, SANFORD, ME 04073-0941
PO BOX 942, SANFORD, ME 04073-0942
PO BOX 943, SANFORD, ME 04073-0943
PO BOX 944, SANFORD, ME 04073-0944
PO BOX 945, SANFORD, ME 04073-0945
PO BOX 946, SANFORD, ME 04073-0946
PO BOX 947, SANFORD, ME 04073-0947
PO BOX 948, SANFORD, ME 04073-0948
PO BOX 949, SANFORD, ME 04073-0949
PO BOX 950, SANFORD, ME 04073-0950
PO BOX 951, SANFORD, ME 04073-0951
PO BOX 952, SANFORD, ME 04073-0952
PO BOX 953, SANFORD, ME 04073-0953
PO BOX 954, SANFORD, ME 04073-0954
PO BOX 955, SANFORD, ME 04073-0955
PO BOX 956, SANFORD, ME 04073-0956
PO BOX 957, SANFORD, ME 04073-0957
PO BOX 958, SANFORD, ME 04073-0958
PO BOX 959, SANFORD, ME 04073-0959
PO BOX 960, SANFORD, ME 04073-0960
PO BOX 961, SANFORD, ME 04073-0961
PO BOX 962, SANFORD, ME 04073-0962
PO BOX 963, SANFORD, ME 04073-0963
PO BOX 964, SANFORD, ME 04073-0964
PO BOX 965, SANFORD, ME 04073-0965
PO BOX 966, SANFORD, ME 04073-0966
PO BOX 967, SANFORD, ME 04073-0967
PO BOX 968, SANFORD, ME 04073-0968
PO BOX 969, SANFORD, ME 04073-0969
PO BOX 970, SANFORD, ME 04073-0970
PO BOX 971, SANFORD, ME 04073-0971
PO BOX 972, SANFORD, ME 04073-0972
PO BOX 973, SANFORD, ME 04073-0973
PO BOX 974, SANFORD, ME 04073-0974
PO BOX 975, SANFORD, ME 04073-0975
PO BOX 976, SANFORD, ME 04073-0976
PO BOX 977, SANFORD, ME 04073-0977
PO BOX 978, SANFORD, ME 04073-0978
PO BOX 979, SANFORD, ME 04073-0979
PO BOX 980, SANFORD, ME 04073-0980
PO BOX 981, SANFORD, ME 04073-0981
PO BOX 982, SANFORD, ME 04073-0982
PO BOX 983, SANFORD, ME 04073-0983
PO BOX 984, SANFORD, ME 04073-0984
PO BOX 985, SANFORD, ME 04073-0985
PO BOX 986, SANFORD, ME 04073-0986
PO BOX 987, SANFORD, ME 04073-0987
PO BOX 988, SANFORD, ME 04073-0988
PO BOX 989, SANFORD, ME 04073-0989
PO BOX 990, SANFORD, ME 04073-0990
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