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, MORENO VALLEY, CA 92556-0901
PO BOX 902, MORENO VALLEY, CA 92556-0902
PO BOX 903, MORENO VALLEY, CA 92556-0903
PO BOX 904, MORENO VALLEY, CA 92556-0904
PO BOX 905, MORENO VALLEY, CA 92556-0905
PO BOX 906, MORENO VALLEY, CA 92556-0906
PO BOX 907, MORENO VALLEY, CA 92556-0907
PO BOX 908, MORENO VALLEY, CA 92556-0908
PO BOX 909, MORENO VALLEY, CA 92556-0909
PO BOX 910, MORENO VALLEY, CA 92556-0910
PO BOX 911, MORENO VALLEY, CA 92556-0911
PO BOX 912, MORENO VALLEY, CA 92556-0912
PO BOX 913, MORENO VALLEY, CA 92556-0913
PO BOX 914, MORENO VALLEY, CA 92556-0914
PO BOX 915, MORENO VALLEY, CA 92556-0915
PO BOX 916, MORENO VALLEY, CA 92556-0916
PO BOX 917, MORENO VALLEY, CA 92556-0917
PO BOX 918, MORENO VALLEY, CA 92556-0918
PO BOX 919, MORENO VALLEY, CA 92556-0919
PO BOX 920, MORENO VALLEY, CA 92556-0920
PO BOX 921, MORENO VALLEY, CA 92556-0921
PO BOX 922, MORENO VALLEY, CA 92556-0922
PO BOX 923, MORENO VALLEY, CA 92556-0923
PO BOX 924, MORENO VALLEY, CA 92556-0924
PO BOX 925, MORENO VALLEY, CA 92556-0925
PO BOX 926, MORENO VALLEY, CA 92556-0926
PO BOX 927, MORENO VALLEY, CA 92556-0927
PO BOX 928, MORENO VALLEY, CA 92556-0928
PO BOX 929, MORENO VALLEY, CA 92556-0929
PO BOX 930, MORENO VALLEY, CA 92556-0930
PO BOX 931, MORENO VALLEY, CA 92556-0931
PO BOX 932, MORENO VALLEY, CA 92556-0932
PO BOX 933, MORENO VALLEY, CA 92556-0933
PO BOX 934, MORENO VALLEY, CA 92556-0934
PO BOX 935, MORENO VALLEY, CA 92556-0935
PO BOX 936, MORENO VALLEY, CA 92556-0936
PO BOX 937, MORENO VALLEY, CA 92556-0937
PO BOX 938, MORENO VALLEY, CA 92556-0938
PO BOX 939, MORENO VALLEY, CA 92556-0939
PO BOX 940, MORENO VALLEY, CA 92556-0940
PO BOX 941, MORENO VALLEY, CA 92556-0941
PO BOX 942, MORENO VALLEY, CA 92556-0942
PO BOX 943, MORENO VALLEY, CA 92556-0943
PO BOX 944, MORENO VALLEY, CA 92556-0944
PO BOX 945, MORENO VALLEY, CA 92556-0945
PO BOX 946, MORENO VALLEY, CA 92556-0946
PO BOX 947, MORENO VALLEY, CA 92556-0947
PO BOX 948, MORENO VALLEY, CA 92556-0948
PO BOX 949, MORENO VALLEY, CA 92556-0949
PO BOX 950, MORENO VALLEY, CA 92556-0950
PO BOX 951, MORENO VALLEY, CA 92556-0951
PO BOX 952, MORENO VALLEY, CA 92556-0952
PO BOX 953, MORENO VALLEY, CA 92556-0953
PO BOX 954, MORENO VALLEY, CA 92556-0954
PO BOX 955, MORENO VALLEY, CA 92556-0955
PO BOX 956, MORENO VALLEY, CA 92556-0956
PO BOX 957, MORENO VALLEY, CA 92556-0957
PO BOX 958, MORENO VALLEY, CA 92556-0958
PO BOX 959, MORENO VALLEY, CA 92556-0959
PO BOX 960, MORENO VALLEY, CA 92556-0960
PO BOX 961, MORENO VALLEY, CA 92556-0961
PO BOX 962, MORENO VALLEY, CA 92556-0962
PO BOX 963, MORENO VALLEY, CA 92556-0963
PO BOX 964, MORENO VALLEY, CA 92556-0964
PO BOX 965, MORENO VALLEY, CA 92556-0965
PO BOX 966, MORENO VALLEY, CA 92556-0966
PO BOX 967, MORENO VALLEY, CA 92556-0967
PO BOX 968, MORENO VALLEY, CA 92556-0968
PO BOX 969, MORENO VALLEY, CA 92556-0969
PO BOX 970, MORENO VALLEY, CA 92556-0970
PO BOX 971, MORENO VALLEY, CA 92556-0971
PO BOX 972, MORENO VALLEY, CA 92556-0972
PO BOX 973, MORENO VALLEY, CA 92556-0973
PO BOX 974, MORENO VALLEY, CA 92556-0974
PO BOX 975, MORENO VALLEY, CA 92556-0975
PO BOX 976, MORENO VALLEY, CA 92556-0976
PO BOX 977, MORENO VALLEY, CA 92556-0977
PO BOX 978, MORENO VALLEY, CA 92556-0978
PO BOX 979, MORENO VALLEY, CA 92556-0979
PO BOX 980, MORENO VALLEY, CA 92556-0980
PO BOX 981, MORENO VALLEY, CA 92556-0981
PO BOX 982, MORENO VALLEY, CA 92556-0982
PO BOX 983, MORENO VALLEY, CA 92556-0983
PO BOX 984, MORENO VALLEY, CA 92556-0984
PO BOX 985, MORENO VALLEY, CA 92556-0985
PO BOX 986, MORENO VALLEY, CA 92556-0986
PO BOX 987, MORENO VALLEY, CA 92556-0987
PO BOX 988, MORENO VALLEY, CA 92556-0988
PO BOX 989, MORENO VALLEY, CA 92556-0989
PO BOX 990, MORENO VALLEY, CA 92556-0990
PO BOX 991, MORENO VALLEY, CA 92556-0991
PO BOX 992, MORENO VALLEY, CA 92556-0992
PO BOX 993, MORENO VALLEY, CA 92556-0993
PO BOX 994, MORENO VALLEY, CA 92556-0994
PO BOX 995, MORENO VALLEY, CA 92556-0995
PO BOX 996, MORENO VALLEY, CA 92556-0996
PO BOX 997, MORENO VALLEY, CA 92556-0997
PO BOX 998, MORENO VALLEY, CA 92556-0998
PO BOX 999, MORENO VALLEY, CA 92556-0999
PO BOX 1000, MORENO VALLEY, CA 92556-1000
PO BOX 1001, MORENO VALLEY, CA 92556-1001
PO BOX 1002, MORENO VALLEY, CA 92556-1002
PO BOX 1003, MORENO VALLEY, CA 92556-1003
PO BOX 1004, MORENO VALLEY, CA 92556-1004
PO BOX 1005, MORENO VALLEY, CA 92556-1005
PO BOX 1006, MORENO VALLEY, CA 92556-1006
PO BOX 1007, MORENO VALLEY, CA 92556-1007
PO BOX 1008, MORENO VALLEY, CA 92556-1008
PO BOX 1009, MORENO VALLEY, CA 92556-1009
PO BOX 1010, MORENO VALLEY, CA 92556-1010
PO BOX 1011, MORENO VALLEY, CA 92556-1011
PO BOX 1012, MORENO VALLEY, CA 92556-1012
PO BOX 1013, MORENO VALLEY, CA 92556-1013
PO BOX 1014, MORENO VALLEY, CA 92556-1014
PO BOX 1015, MORENO VALLEY, CA 92556-1015
PO BOX 1016, MORENO VALLEY, CA 92556-1016
PO BOX 1017, MORENO VALLEY, CA 92556-1017
PO BOX 1018, MORENO VALLEY, CA 92556-1018
PO BOX 1019, MORENO VALLEY, CA 92556-1019
PO BOX 1020, MORENO VALLEY, CA 92556-1020
PO BOX 1021, MORENO VALLEY, CA 92556-1021
PO BOX 1022, MORENO VALLEY, CA 92556-1022
PO BOX 1023, MORENO VALLEY, CA 92556-1023
PO BOX 1024, MORENO VALLEY, CA 92556-1024
PO BOX 1025, MORENO VALLEY, CA 92556-1025
PO BOX 1026, MORENO VALLEY, CA 92556-1026
PO BOX 1027, MORENO VALLEY, CA 92556-1027
PO BOX 1028, MORENO VALLEY, CA 92556-1028
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