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, CARLSBAD, NM 88221-0901
PO BOX 902, CARLSBAD, NM 88221-0902
PO BOX 903, CARLSBAD, NM 88221-0903
PO BOX 904, CARLSBAD, NM 88221-0904
PO BOX 905, CARLSBAD, NM 88221-0905
PO BOX 906, CARLSBAD, NM 88221-0906
PO BOX 907, CARLSBAD, NM 88221-0907
PO BOX 908, CARLSBAD, NM 88221-0908
PO BOX 909, CARLSBAD, NM 88221-0909
PO BOX 910, CARLSBAD, NM 88221-0910
PO BOX 911, CARLSBAD, NM 88221-0911
PO BOX 912, CARLSBAD, NM 88221-0912
PO BOX 913, CARLSBAD, NM 88221-0913
PO BOX 914, CARLSBAD, NM 88221-0914
PO BOX 915, CARLSBAD, NM 88221-0915
PO BOX 916, CARLSBAD, NM 88221-0916
PO BOX 917, CARLSBAD, NM 88221-0917
PO BOX 918, CARLSBAD, NM 88221-0918
PO BOX 919, CARLSBAD, NM 88221-0919
PO BOX 920, CARLSBAD, NM 88221-0920
PO BOX 921, CARLSBAD, NM 88221-0921
PO BOX 922, CARLSBAD, NM 88221-0922
PO BOX 923, CARLSBAD, NM 88221-0923
PO BOX 924, CARLSBAD, NM 88221-0924
PO BOX 925, CARLSBAD, NM 88221-0925
PO BOX 926, CARLSBAD, NM 88221-0926
PO BOX 927, CARLSBAD, NM 88221-0927
PO BOX 928, CARLSBAD, NM 88221-0928
PO BOX 929, CARLSBAD, NM 88221-0929
PO BOX 930, CARLSBAD, NM 88221-0930
PO BOX 931, CARLSBAD, NM 88221-0931
PO BOX 932, CARLSBAD, NM 88221-0932
PO BOX 933, CARLSBAD, NM 88221-0933
PO BOX 934, CARLSBAD, NM 88221-0934
PO BOX 935, CARLSBAD, NM 88221-0935
PO BOX 936, CARLSBAD, NM 88221-0936
PO BOX 937, CARLSBAD, NM 88221-0937
PO BOX 938, CARLSBAD, NM 88221-0938
PO BOX 939, CARLSBAD, NM 88221-0939
PO BOX 940, CARLSBAD, NM 88221-0940
PO BOX 941, CARLSBAD, NM 88221-0941
PO BOX 942, CARLSBAD, NM 88221-0942
PO BOX 943, CARLSBAD, NM 88221-0943
PO BOX 944, CARLSBAD, NM 88221-0944
PO BOX 945, CARLSBAD, NM 88221-0945
PO BOX 946, CARLSBAD, NM 88221-0946
PO BOX 947, CARLSBAD, NM 88221-0947
PO BOX 948, CARLSBAD, NM 88221-0948
PO BOX 949, CARLSBAD, NM 88221-0949
PO BOX 950, CARLSBAD, NM 88221-0950
PO BOX 951, CARLSBAD, NM 88221-0951
PO BOX 952, CARLSBAD, NM 88221-0952
PO BOX 953, CARLSBAD, NM 88221-0953
PO BOX 954, CARLSBAD, NM 88221-0954
PO BOX 955, CARLSBAD, NM 88221-0955
PO BOX 956, CARLSBAD, NM 88221-0956
PO BOX 957, CARLSBAD, NM 88221-0957
PO BOX 958, CARLSBAD, NM 88221-0958
PO BOX 959, CARLSBAD, NM 88221-0959
PO BOX 960, CARLSBAD, NM 88221-0960
PO BOX 961, CARLSBAD, NM 88221-0961
PO BOX 962, CARLSBAD, NM 88221-0962
PO BOX 963, CARLSBAD, NM 88221-0963
PO BOX 964, CARLSBAD, NM 88221-0964
PO BOX 965, CARLSBAD, NM 88221-0965
PO BOX 966, CARLSBAD, NM 88221-0966
PO BOX 967, CARLSBAD, NM 88221-0967
PO BOX 968, CARLSBAD, NM 88221-0968
PO BOX 969, CARLSBAD, NM 88221-0969
PO BOX 970, CARLSBAD, NM 88221-0970
PO BOX 971, CARLSBAD, NM 88221-0971
PO BOX 972, CARLSBAD, NM 88221-0972
PO BOX 973, CARLSBAD, NM 88221-0973
PO BOX 974, CARLSBAD, NM 88221-0974
PO BOX 975, CARLSBAD, NM 88221-0975
PO BOX 976, CARLSBAD, NM 88221-0976
PO BOX 977, CARLSBAD, NM 88221-0977
PO BOX 978, CARLSBAD, NM 88221-0978
PO BOX 979, CARLSBAD, NM 88221-0979
PO BOX 980, CARLSBAD, NM 88221-0980
PO BOX 981, CARLSBAD, NM 88221-0981
PO BOX 982, CARLSBAD, NM 88221-0982
PO BOX 983, CARLSBAD, NM 88221-0983
PO BOX 984, CARLSBAD, NM 88221-0984
PO BOX 985, CARLSBAD, NM 88221-0985
PO BOX 986, CARLSBAD, NM 88221-0986
PO BOX 987, CARLSBAD, NM 88221-0987
PO BOX 988, CARLSBAD, NM 88221-0988
PO BOX 989, CARLSBAD, NM 88221-0989
PO BOX 990, CARLSBAD, NM 88221-0990
PO BOX 991, CARLSBAD, NM 88221-0991
PO BOX 992, CARLSBAD, NM 88221-0992
PO BOX 993, CARLSBAD, NM 88221-0993
PO BOX 994, CARLSBAD, NM 88221-0994
PO BOX 995, CARLSBAD, NM 88221-0995
PO BOX 996, CARLSBAD, NM 88221-0996
PO BOX 997, CARLSBAD, NM 88221-0997
PO BOX 998, CARLSBAD, NM 88221-0998
PO BOX 999, CARLSBAD, NM 88221-0999
PO BOX 1000, CARLSBAD, NM 88221-1000
PO BOX 1001, CARLSBAD, NM 88221-1001
PO BOX 1002, CARLSBAD, NM 88221-1002
PO BOX 1003, CARLSBAD, NM 88221-1003
PO BOX 1004, CARLSBAD, NM 88221-1004
PO BOX 1005, CARLSBAD, NM 88221-1005
PO BOX 1006, CARLSBAD, NM 88221-1006
PO BOX 1007, CARLSBAD, NM 88221-1007
PO BOX 1008, CARLSBAD, NM 88221-1008
PO BOX 1009, CARLSBAD, NM 88221-1009
PO BOX 1010, CARLSBAD, NM 88221-1010
PO BOX 1011, CARLSBAD, NM 88221-1011
PO BOX 1012, CARLSBAD, NM 88221-1012
PO BOX 1013, CARLSBAD, NM 88221-1013
PO BOX 1014, CARLSBAD, NM 88221-1014
PO BOX 1015, CARLSBAD, NM 88221-1015
PO BOX 1016, CARLSBAD, NM 88221-1016
PO BOX 1017, CARLSBAD, NM 88221-1017
PO BOX 1018, CARLSBAD, NM 88221-1018
PO BOX 1019, CARLSBAD, NM 88221-1019
PO BOX 1020, CARLSBAD, NM 88221-1020
PO BOX 1021, CARLSBAD, NM 88221-1021
PO BOX 1022, CARLSBAD, NM 88221-1022
PO BOX 1023, CARLSBAD, NM 88221-1023
PO BOX 1024, CARLSBAD, NM 88221-1024
PO BOX 1025, CARLSBAD, NM 88221-1025
PO BOX 1026, CARLSBAD, NM 88221-1026
PO BOX 1027, CARLSBAD, NM 88221-1027
PO BOX 1028, CARLSBAD, NM 88221-1028
PO BOX 1029, CARLSBAD, NM 88221-1029
PO BOX 1030, CARLSBAD, NM 88221-1030
PO BOX 1031, CARLSBAD, NM 88221-1031
PO BOX 1032, CARLSBAD, NM 88221-1032
PO BOX 1033, CARLSBAD, NM 88221-1033
PO BOX 1034, CARLSBAD, NM 88221-1034
PO BOX 1035, CARLSBAD, NM 88221-1035
PO BOX 1036, CARLSBAD, NM 88221-1036
PO BOX 1037, CARLSBAD, NM 88221-1037
PO BOX 1038, CARLSBAD, NM 88221-1038
PO BOX 1039, CARLSBAD, NM 88221-1039
PO BOX 1040, CARLSBAD, NM 88221-1040
PO BOX 1041, CARLSBAD, NM 88221-1041
PO BOX 1042, CARLSBAD, NM 88221-1042
PO BOX 1043, CARLSBAD, NM 88221-1043
PO BOX 1044, CARLSBAD, NM 88221-1044
PO BOX 1045, CARLSBAD, NM 88221-1045
PO BOX 1046, CARLSBAD, NM 88221-1046
PO BOX 1047, CARLSBAD, NM 88221-1047
PO BOX 1048, CARLSBAD, NM 88221-1048
PO BOX 1049, CARLSBAD, NM 88221-1049
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