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, STAMFORD, CT 06904-0821
PO BOX 822, STAMFORD, CT 06904-0822
PO BOX 823, STAMFORD, CT 06904-0823
PO BOX 824, STAMFORD, CT 06904-0824
PO BOX 825, STAMFORD, CT 06904-0825
PO BOX 826, STAMFORD, CT 06904-0826
PO BOX 827, STAMFORD, CT 06904-0827
PO BOX 828, STAMFORD, CT 06904-0828
PO BOX 829, STAMFORD, CT 06904-0829
PO BOX 830, STAMFORD, CT 06904-0830
PO BOX 831, STAMFORD, CT 06904-0831
PO BOX 832, STAMFORD, CT 06904-0832
PO BOX 833, STAMFORD, CT 06904-0833
PO BOX 834, STAMFORD, CT 06904-0834
PO BOX 835, STAMFORD, CT 06904-0835
PO BOX 836, STAMFORD, CT 06904-0836
PO BOX 837, STAMFORD, CT 06904-0837
PO BOX 838, STAMFORD, CT 06904-0838
PO BOX 839, STAMFORD, CT 06904-0839
PO BOX 840, STAMFORD, CT 06904-0840
PO BOX 841, STAMFORD, CT 06904-0841
PO BOX 842, STAMFORD, CT 06904-0842
PO BOX 843, STAMFORD, CT 06904-0843
PO BOX 844, STAMFORD, CT 06904-0844
PO BOX 845, STAMFORD, CT 06904-0845
PO BOX 846, STAMFORD, CT 06904-0846
PO BOX 847, STAMFORD, CT 06904-0847
PO BOX 848, STAMFORD, CT 06904-0848
PO BOX 849, STAMFORD, CT 06904-0849
PO BOX 850, STAMFORD, CT 06904-0850
PO BOX 851, STAMFORD, CT 06904-0851
PO BOX 852, STAMFORD, CT 06904-0852
PO BOX 853, STAMFORD, CT 06904-0853
PO BOX 854, STAMFORD, CT 06904-0854
PO BOX 855, STAMFORD, CT 06904-0855
PO BOX 856, STAMFORD, CT 06904-0856
PO BOX 857, STAMFORD, CT 06904-0857
PO BOX 858, STAMFORD, CT 06904-0858
PO BOX 859, STAMFORD, CT 06904-0859
PO BOX 860, STAMFORD, CT 06904-0860
PO BOX 861, STAMFORD, CT 06904-0861
PO BOX 862, STAMFORD, CT 06904-0862
PO BOX 863, STAMFORD, CT 06904-0863
PO BOX 864, STAMFORD, CT 06904-0864
PO BOX 865, STAMFORD, CT 06904-0865
PO BOX 866, STAMFORD, CT 06904-0866
PO BOX 867, STAMFORD, CT 06904-0867
PO BOX 868, STAMFORD, CT 06904-0868
PO BOX 869, STAMFORD, CT 06904-0869
PO BOX 870, STAMFORD, CT 06904-0870
PO BOX 871, STAMFORD, CT 06904-0871
PO BOX 872, STAMFORD, CT 06904-0872
PO BOX 873, STAMFORD, CT 06904-0873
PO BOX 874, STAMFORD, CT 06904-0874
PO BOX 875, STAMFORD, CT 06904-0875
PO BOX 876, STAMFORD, CT 06904-0876
PO BOX 877, STAMFORD, CT 06904-0877
PO BOX 878, STAMFORD, CT 06904-0878
PO BOX 879, STAMFORD, CT 06904-0879
PO BOX 880, STAMFORD, CT 06904-0880
PO BOX 881, STAMFORD, CT 06904-0881
PO BOX 882, STAMFORD, CT 06904-0882
PO BOX 883, STAMFORD, CT 06904-0883
PO BOX 884, STAMFORD, CT 06904-0884
PO BOX 885, STAMFORD, CT 06904-0885
PO BOX 886, STAMFORD, CT 06904-0886
PO BOX 887, STAMFORD, CT 06904-0887
PO BOX 888, STAMFORD, CT 06904-0888
PO BOX 889, STAMFORD, CT 06904-0889
PO BOX 890, STAMFORD, CT 06904-0890
PO BOX 891, STAMFORD, CT 06904-0891
PO BOX 892, STAMFORD, CT 06904-0892
PO BOX 893, STAMFORD, CT 06904-0893
PO BOX 894, STAMFORD, CT 06904-0894
PO BOX 895, STAMFORD, CT 06904-0895
PO BOX 896, STAMFORD, CT 06904-0896
PO BOX 897, STAMFORD, CT 06904-0897
PO BOX 898, STAMFORD, CT 06904-0898
PO BOX 899, STAMFORD, CT 06904-0899
PO BOX 900, STAMFORD, CT 06904-0900
PO BOX 901, STAMFORD, CT 06904-0901
PO BOX 902, STAMFORD, CT 06904-0902
PO BOX 903, STAMFORD, CT 06904-0903
PO BOX 904, STAMFORD, CT 06904-0904
PO BOX 905, STAMFORD, CT 06904-0905
PO BOX 906, STAMFORD, CT 06904-0906
PO BOX 907, STAMFORD, CT 06904-0907
PO BOX 908, STAMFORD, CT 06904-0908
PO BOX 909, STAMFORD, CT 06904-0909
PO BOX 910, STAMFORD, CT 06904-0910
PO BOX 911, STAMFORD, CT 06904-0911
PO BOX 912, STAMFORD, CT 06904-0912
PO BOX 913, STAMFORD, CT 06904-0913
PO BOX 914, STAMFORD, CT 06904-0914
PO BOX 915, STAMFORD, CT 06904-0915
PO BOX 916, STAMFORD, CT 06904-0916
PO BOX 917, STAMFORD, CT 06904-0917
PO BOX 918, STAMFORD, CT 06904-0918
PO BOX 919, STAMFORD, CT 06904-0919
PO BOX 920, STAMFORD, CT 06904-0920
PO BOX 921, STAMFORD, CT 06904-0921
PO BOX 922, STAMFORD, CT 06904-0922
PO BOX 923, STAMFORD, CT 06904-0923
PO BOX 924, STAMFORD, CT 06904-0924
PO BOX 925, STAMFORD, CT 06904-0925
PO BOX 926, STAMFORD, CT 06904-0926
PO BOX 927, STAMFORD, CT 06904-0927
PO BOX 928, STAMFORD, CT 06904-0928
PO BOX 929, STAMFORD, CT 06904-0929
PO BOX 930, STAMFORD, CT 06904-0930
PO BOX 931, STAMFORD, CT 06904-0931
PO BOX 932, STAMFORD, CT 06904-0932
PO BOX 933, STAMFORD, CT 06904-0933
PO BOX 934, STAMFORD, CT 06904-0934
PO BOX 935, STAMFORD, CT 06904-0935
PO BOX 936, STAMFORD, CT 06904-0936
PO BOX 937, STAMFORD, CT 06904-0937
PO BOX 938, STAMFORD, CT 06904-0938
PO BOX 939, STAMFORD, CT 06904-0939
PO BOX 940, STAMFORD, CT 06904-0940
PO BOX 941, STAMFORD, CT 06904-0941
PO BOX 942, STAMFORD, CT 06904-0942
PO BOX 943, STAMFORD, CT 06904-0943
PO BOX 944, STAMFORD, CT 06904-0944
PO BOX 945, STAMFORD, CT 06904-0945
PO BOX 946, STAMFORD, CT 06904-0946
PO BOX 947, STAMFORD, CT 06904-0947
PO BOX 948, STAMFORD, CT 06904-0948
PO BOX 949, STAMFORD, CT 06904-0949
PO BOX 950, STAMFORD, CT 06904-0950
PO BOX 951, STAMFORD, CT 06904-0951
PO BOX 952, STAMFORD, CT 06904-0952
PO BOX 953, STAMFORD, CT 06904-0953
PO BOX 954, STAMFORD, CT 06904-0954
PO BOX 955, STAMFORD, CT 06904-0955
PO BOX 956, STAMFORD, CT 06904-0956
PO BOX 957, STAMFORD, CT 06904-0957
PO BOX 958, STAMFORD, CT 06904-0958
PO BOX 959, STAMFORD, CT 06904-0959
PO BOX 960, STAMFORD, CT 06904-0960
PO BOX 961, STAMFORD, CT 06904-0961
PO BOX 962, STAMFORD, CT 06904-0962
PO BOX 963, STAMFORD, CT 06904-0963
PO BOX 964, STAMFORD, CT 06904-0964
PO BOX 965, STAMFORD, CT 06904-0965
PO BOX 966, STAMFORD, CT 06904-0966
PO BOX 967, STAMFORD, CT 06904-0967
PO BOX 968, STAMFORD, CT 06904-0968
PO BOX 969, STAMFORD, CT 06904-0969
PO BOX 970, STAMFORD, CT 06904-0970
PO BOX 971, STAMFORD, CT 06904-0971
PO BOX 972, STAMFORD, CT 06904-0972
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