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 430900, SAN YSIDRO, CA 92143-0900
PO BOX 430901, SAN YSIDRO, CA 92143-0901
PO BOX 430902, SAN YSIDRO, CA 92143-0902
PO BOX 430903, SAN YSIDRO, CA 92143-0903
PO BOX 430904, SAN YSIDRO, CA 92143-0904
PO BOX 430905, SAN YSIDRO, CA 92143-0905
PO BOX 430906, SAN YSIDRO, CA 92143-0906
PO BOX 430907, SAN YSIDRO, CA 92143-0907
PO BOX 430908, SAN YSIDRO, CA 92143-0908
PO BOX 430909, SAN YSIDRO, CA 92143-0909
PO BOX 430910, SAN YSIDRO, CA 92143-0910
PO BOX 430911, SAN YSIDRO, CA 92143-0911
PO BOX 430912, SAN YSIDRO, CA 92143-0912
PO BOX 430913, SAN YSIDRO, CA 92143-0913
PO BOX 430914, SAN YSIDRO, CA 92143-0914
PO BOX 430915, SAN YSIDRO, CA 92143-0915
PO BOX 430916, SAN YSIDRO, CA 92143-0916
PO BOX 430917, SAN YSIDRO, CA 92143-0917
PO BOX 430918, SAN YSIDRO, CA 92143-0918
PO BOX 430919, SAN YSIDRO, CA 92143-0919
PO BOX 430920, SAN YSIDRO, CA 92143-0920
PO BOX 430921, SAN YSIDRO, CA 92143-0921
PO BOX 430922, SAN YSIDRO, CA 92143-0922
PO BOX 430923, SAN YSIDRO, CA 92143-0923
PO BOX 430924, SAN YSIDRO, CA 92143-0924
PO BOX 430925, SAN YSIDRO, CA 92143-0925
PO BOX 430926, SAN YSIDRO, CA 92143-0926
PO BOX 430927, SAN YSIDRO, CA 92143-0927
PO BOX 430928, SAN YSIDRO, CA 92143-0928
PO BOX 430929, SAN YSIDRO, CA 92143-0929
PO BOX 430930, SAN YSIDRO, CA 92143-0930
PO BOX 430931, SAN YSIDRO, CA 92143-0931
PO BOX 430932, SAN YSIDRO, CA 92143-0932
PO BOX 430933, SAN YSIDRO, CA 92143-0933
PO BOX 430934, SAN YSIDRO, CA 92143-0934
PO BOX 430935, SAN YSIDRO, CA 92143-0935
PO BOX 430936, SAN YSIDRO, CA 92143-0936
PO BOX 430937, SAN YSIDRO, CA 92143-0937
PO BOX 430938, SAN YSIDRO, CA 92143-0938
PO BOX 430939, SAN YSIDRO, CA 92143-0939
PO BOX 430940, SAN YSIDRO, CA 92143-0940
PO BOX 430941, SAN YSIDRO, CA 92143-0941
PO BOX 430942, SAN YSIDRO, CA 92143-0942
PO BOX 430943, SAN YSIDRO, CA 92143-0943
PO BOX 430944, SAN YSIDRO, CA 92143-0944
PO BOX 430945, SAN YSIDRO, CA 92143-0945
PO BOX 430946, SAN YSIDRO, CA 92143-0946
PO BOX 430947, SAN YSIDRO, CA 92143-0947
PO BOX 430948, SAN YSIDRO, CA 92143-0948
PO BOX 430949, SAN YSIDRO, CA 92143-0949
PO BOX 430950, SAN YSIDRO, CA 92143-0950
PO BOX 430951, SAN YSIDRO, CA 92143-0951
PO BOX 430952, SAN YSIDRO, CA 92143-0952
PO BOX 430953, SAN YSIDRO, CA 92143-0953
PO BOX 430954, SAN YSIDRO, CA 92143-0954
PO BOX 430955, SAN YSIDRO, CA 92143-0955
PO BOX 430956, SAN YSIDRO, CA 92143-0956
PO BOX 430957, SAN YSIDRO, CA 92143-0957
PO BOX 430958, SAN YSIDRO, CA 92143-0958
PO BOX 430959, SAN YSIDRO, CA 92143-0959
PO BOX 430960, SAN YSIDRO, CA 92143-0960
PO BOX 430961, SAN YSIDRO, CA 92143-0961
PO BOX 430962, SAN YSIDRO, CA 92143-0962
PO BOX 430963, SAN YSIDRO, CA 92143-0963
PO BOX 430964, SAN YSIDRO, CA 92143-0964
PO BOX 430965, SAN YSIDRO, CA 92143-0965
PO BOX 430966, SAN YSIDRO, CA 92143-0966
PO BOX 430967, SAN YSIDRO, CA 92143-0967
PO BOX 430968, SAN YSIDRO, CA 92143-0968
PO BOX 430969, SAN YSIDRO, CA 92143-0969
PO BOX 430970, SAN YSIDRO, CA 92143-0970
PO BOX 430971, SAN YSIDRO, CA 92143-0971
PO BOX 430972, SAN YSIDRO, CA 92143-0972
PO BOX 430973, SAN YSIDRO, CA 92143-0973
PO BOX 430974, SAN YSIDRO, CA 92143-0974
PO BOX 430975, SAN YSIDRO, CA 92143-0975
PO BOX 430976, SAN YSIDRO, CA 92143-0976
PO BOX 430977, SAN YSIDRO, CA 92143-0977
PO BOX 430978, SAN YSIDRO, CA 92143-0978
PO BOX 430979, SAN YSIDRO, CA 92143-0979
PO BOX 430980, SAN YSIDRO, CA 92143-0980
PO BOX 430981, SAN YSIDRO, CA 92143-0981
PO BOX 430982, SAN YSIDRO, CA 92143-0982
PO BOX 430983, SAN YSIDRO, CA 92143-0983
PO BOX 430984, SAN YSIDRO, CA 92143-0984
PO BOX 430985, SAN YSIDRO, CA 92143-0985
PO BOX 430986, SAN YSIDRO, CA 92143-0986
PO BOX 430987, SAN YSIDRO, CA 92143-0987
PO BOX 430988, SAN YSIDRO, CA 92143-0988
PO BOX 430989, SAN YSIDRO, CA 92143-0989
PO BOX 430990, SAN YSIDRO, CA 92143-0990
PO BOX 430991, SAN YSIDRO, CA 92143-0991
PO BOX 430992, SAN YSIDRO, CA 92143-0992
PO BOX 430993, SAN YSIDRO, CA 92143-0993
PO BOX 430994, SAN YSIDRO, CA 92143-0994
PO BOX 430995, SAN YSIDRO, CA 92143-0995
PO BOX 430996, SAN YSIDRO, CA 92143-0996
PO BOX 430997, SAN YSIDRO, CA 92143-0997
PO BOX 430998, SAN YSIDRO, CA 92143-0998
PO BOX 430999, SAN YSIDRO, CA 92143-0999
PO BOX 431000, SAN YSIDRO, CA 92143-1000
PO BOX 431001, SAN YSIDRO, CA 92143-1001
PO BOX 431002, SAN YSIDRO, CA 92143-1002
PO BOX 431003, SAN YSIDRO, CA 92143-1003
PO BOX 431004, SAN YSIDRO, CA 92143-1004
PO BOX 431005, SAN YSIDRO, CA 92143-1005
PO BOX 431006, SAN YSIDRO, CA 92143-1006
PO BOX 431007, SAN YSIDRO, CA 92143-1007
PO BOX 431008, SAN YSIDRO, CA 92143-1008
PO BOX 431009, SAN YSIDRO, CA 92143-1009
PO BOX 431010, SAN YSIDRO, CA 92143-1010
PO BOX 431011, SAN YSIDRO, CA 92143-1011
PO BOX 431012, SAN YSIDRO, CA 92143-1012
PO BOX 431013, SAN YSIDRO, CA 92143-1013
PO BOX 431014, SAN YSIDRO, CA 92143-1014
PO BOX 431015, SAN YSIDRO, CA 92143-1015
PO BOX 431016, SAN YSIDRO, CA 92143-1016
PO BOX 431017, SAN YSIDRO, CA 92143-1017
PO BOX 431018, SAN YSIDRO, CA 92143-1018
PO BOX 431019, SAN YSIDRO, CA 92143-1019
PO BOX 431020, SAN YSIDRO, CA 92143-1020
PO BOX 431021, SAN YSIDRO, CA 92143-1021
PO BOX 431022, SAN YSIDRO, CA 92143-1022
PO BOX 431023, SAN YSIDRO, CA 92143-1023
PO BOX 431024, SAN YSIDRO, CA 92143-1024
PO BOX 431025, SAN YSIDRO, CA 92143-1025
PO BOX 431026, SAN YSIDRO, CA 92143-1026
PO BOX 431027, SAN YSIDRO, CA 92143-1027
PO BOX 431028, SAN YSIDRO, CA 92143-1028
PO BOX 431029, SAN YSIDRO, CA 92143-1029
PO BOX 431030, SAN YSIDRO, CA 92143-1030
PO BOX 431031, SAN YSIDRO, CA 92143-1031
PO BOX 431032, SAN YSIDRO, CA 92143-1032
PO BOX 431033, SAN YSIDRO, CA 92143-1033
PO BOX 431034, SAN YSIDRO, CA 92143-1034
PO BOX 431035, SAN YSIDRO, CA 92143-1035
PO BOX 431036, SAN YSIDRO, CA 92143-1036
PO BOX 431037, SAN YSIDRO, CA 92143-1037
PO BOX 431038, SAN YSIDRO, CA 92143-1038
PO BOX 431039, SAN YSIDRO, CA 92143-1039
PO BOX 431040, SAN YSIDRO, CA 92143-1040
PO BOX 431041, SAN YSIDRO, CA 92143-1041
PO BOX 431042, SAN YSIDRO, CA 92143-1042
PO BOX 431043, SAN YSIDRO, CA 92143-1043
PO BOX 431044, SAN YSIDRO, CA 92143-1044
PO BOX 431045, SAN YSIDRO, CA 92143-1045
PO BOX 431046, SAN YSIDRO, CA 92143-1046
PO BOX 431047, SAN YSIDRO, CA 92143-1047
PO BOX 431048, SAN YSIDRO, CA 92143-1048
PO BOX 431049, SAN YSIDRO, CA 92143-1049
PO BOX 431050, SAN YSIDRO, CA 92143-1050
PO BOX 431051, SAN YSIDRO, CA 92143-1051
PO BOX 431052, SAN YSIDRO, CA 92143-1052
PO BOX 431053, SAN YSIDRO, CA 92143-1053
PO BOX 431054, SAN YSIDRO, CA 92143-1054
PO BOX 431055, SAN YSIDRO, CA 92143-1055
PO BOX 431056, SAN YSIDRO, CA 92143-1056
PO BOX 431057, SAN YSIDRO, CA 92143-1057
PO BOX 431058, SAN YSIDRO, CA 92143-1058
PO BOX 431059, SAN YSIDRO, CA 92143-1059
PO BOX 431060, SAN YSIDRO, CA 92143-1060
PO BOX 431061, SAN YSIDRO, CA 92143-1061
PO BOX 431062, SAN YSIDRO, CA 92143-1062
PO BOX 431063, SAN YSIDRO, CA 92143-1063
PO BOX 431064, SAN YSIDRO, CA 92143-1064
PO BOX 431065, SAN YSIDRO, CA 92143-1065
PO BOX 431066, SAN YSIDRO, CA 92143-1066
PO BOX 431067, SAN YSIDRO, CA 92143-1067
PO BOX 431068, SAN YSIDRO, CA 92143-1068
PO BOX 431069, SAN YSIDRO, CA 92143-1069
PO BOX 431070, SAN YSIDRO, CA 92143-1070
PO BOX 431071, SAN YSIDRO, CA 92143-1071
PO BOX 431072, SAN YSIDRO, CA 92143-1072
PO BOX 431073, SAN YSIDRO, CA 92143-1073
PO BOX 431074, SAN YSIDRO, CA 92143-1074
PO BOX 431075, SAN YSIDRO, CA 92143-1075
PO BOX 431076, SAN YSIDRO, CA 92143-1076
PO BOX 431077, SAN YSIDRO, CA 92143-1077
PO BOX 431078, SAN YSIDRO, CA 92143-1078
PO BOX 431079, SAN YSIDRO, CA 92143-1079
PO BOX 431080, SAN YSIDRO, CA 92143-1080
PO BOX 431081, SAN YSIDRO, CA 92143-1081
PO BOX 431082, SAN YSIDRO, CA 92143-1082
PO BOX 431083, SAN YSIDRO, CA 92143-1083
PO BOX 431084, SAN YSIDRO, CA 92143-1084
PO BOX 431085, SAN YSIDRO, CA 92143-1085
PO BOX 431086, SAN YSIDRO, CA 92143-1086
PO BOX 431087, SAN YSIDRO, CA 92143-1087
PO BOX 431088, SAN YSIDRO, CA 92143-1088
PO BOX 431089, SAN YSIDRO, CA 92143-1089
PO BOX 431090, SAN YSIDRO, CA 92143-1090
PO BOX 431091, SAN YSIDRO, CA 92143-1091
PO BOX 431092, SAN YSIDRO, CA 92143-1092
PO BOX 431093, SAN YSIDRO, CA 92143-1093
PO BOX 431094, SAN YSIDRO, CA 92143-1094
PO BOX 431095, SAN YSIDRO, CA 92143-1095
PO BOX 431096, SAN YSIDRO, CA 92143-1096
PO BOX 431097, SAN YSIDRO, CA 92143-1097
PO BOX 431098, SAN YSIDRO, CA 92143-1098
PO BOX 431099, SAN YSIDRO, CA 92143-1099
PO BOX 431100, SAN YSIDRO, CA 92143-1100
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