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 951, VALLEY CENTER, CA 92082-0951
PO BOX 952, VALLEY CENTER, CA 92082-0952
PO BOX 953, VALLEY CENTER, CA 92082-0953
PO BOX 954, VALLEY CENTER, CA 92082-0954
PO BOX 955, VALLEY CENTER, CA 92082-0955
PO BOX 956, VALLEY CENTER, CA 92082-0956
PO BOX 957, VALLEY CENTER, CA 92082-0957
PO BOX 958, VALLEY CENTER, CA 92082-0958
PO BOX 959, VALLEY CENTER, CA 92082-0959
PO BOX 960, VALLEY CENTER, CA 92082-0960
PO BOX 961, VALLEY CENTER, CA 92082-0961
PO BOX 962, VALLEY CENTER, CA 92082-0962
PO BOX 963, VALLEY CENTER, CA 92082-0963
PO BOX 964, VALLEY CENTER, CA 92082-0964
PO BOX 965, VALLEY CENTER, CA 92082-0965
PO BOX 966, VALLEY CENTER, CA 92082-0966
PO BOX 967, VALLEY CENTER, CA 92082-0967
PO BOX 968, VALLEY CENTER, CA 92082-0968
PO BOX 969, VALLEY CENTER, CA 92082-0969
PO BOX 970, VALLEY CENTER, CA 92082-0970
PO BOX 971, VALLEY CENTER, CA 92082-0971
PO BOX 972, VALLEY CENTER, CA 92082-0972
PO BOX 973, VALLEY CENTER, CA 92082-0973
PO BOX 974, VALLEY CENTER, CA 92082-0974
PO BOX 975, VALLEY CENTER, CA 92082-0975
PO BOX 976, VALLEY CENTER, CA 92082-0976
PO BOX 977, VALLEY CENTER, CA 92082-0977
PO BOX 978, VALLEY CENTER, CA 92082-0978
PO BOX 979, VALLEY CENTER, CA 92082-0979
PO BOX 980, VALLEY CENTER, CA 92082-0980
PO BOX 981, VALLEY CENTER, CA 92082-0981
PO BOX 982, VALLEY CENTER, CA 92082-0982
PO BOX 983, VALLEY CENTER, CA 92082-0983
PO BOX 984, VALLEY CENTER, CA 92082-0984
PO BOX 985, VALLEY CENTER, CA 92082-0985
PO BOX 986, VALLEY CENTER, CA 92082-0986
PO BOX 987, VALLEY CENTER, CA 92082-0987
PO BOX 988, VALLEY CENTER, CA 92082-0988
PO BOX 989, VALLEY CENTER, CA 92082-0989
PO BOX 990, VALLEY CENTER, CA 92082-0990
PO BOX 991, VALLEY CENTER, CA 92082-0991
PO BOX 992, VALLEY CENTER, CA 92082-0992
PO BOX 993, VALLEY CENTER, CA 92082-0993
PO BOX 994, VALLEY CENTER, CA 92082-0994
PO BOX 995, VALLEY CENTER, CA 92082-0995
PO BOX 996, VALLEY CENTER, CA 92082-0996
PO BOX 997, VALLEY CENTER, CA 92082-0997
PO BOX 998, VALLEY CENTER, CA 92082-0998
PO BOX 999, VALLEY CENTER, CA 92082-0999
PO BOX 1000, VALLEY CENTER, CA 92082-1000
PO BOX 1001, VALLEY CENTER, CA 92082-1001
PO BOX 1002, VALLEY CENTER, CA 92082-1002
PO BOX 1003, VALLEY CENTER, CA 92082-1003
PO BOX 1004, VALLEY CENTER, CA 92082-1004
PO BOX 1005, VALLEY CENTER, CA 92082-1005
PO BOX 1006, VALLEY CENTER, CA 92082-1006
PO BOX 1007, VALLEY CENTER, CA 92082-1007
PO BOX 1008, VALLEY CENTER, CA 92082-1008
PO BOX 1009, VALLEY CENTER, CA 92082-1009
PO BOX 1010, VALLEY CENTER, CA 92082-1010
PO BOX 1011, VALLEY CENTER, CA 92082-1011
PO BOX 1012, VALLEY CENTER, CA 92082-1012
PO BOX 1013, VALLEY CENTER, CA 92082-1013
PO BOX 1014, VALLEY CENTER, CA 92082-1014
PO BOX 1015, VALLEY CENTER, CA 92082-1015
PO BOX 1016, VALLEY CENTER, CA 92082-1016
PO BOX 1017, VALLEY CENTER, CA 92082-1017
PO BOX 1018, VALLEY CENTER, CA 92082-1018
PO BOX 1019, VALLEY CENTER, CA 92082-1019
PO BOX 1020, VALLEY CENTER, CA 92082-1020
PO BOX 1021, VALLEY CENTER, CA 92082-1021
PO BOX 1022, VALLEY CENTER, CA 92082-1022
PO BOX 1023, VALLEY CENTER, CA 92082-1023
PO BOX 1024, VALLEY CENTER, CA 92082-1024
PO BOX 1025, VALLEY CENTER, CA 92082-1025
PO BOX 1026, VALLEY CENTER, CA 92082-1026
PO BOX 1027, VALLEY CENTER, CA 92082-1027
PO BOX 1028, VALLEY CENTER, CA 92082-1028
PO BOX 1029, VALLEY CENTER, CA 92082-1029
PO BOX 1030, VALLEY CENTER, CA 92082-1030
PO BOX 1031, VALLEY CENTER, CA 92082-1031
PO BOX 1032, VALLEY CENTER, CA 92082-1032
PO BOX 1033, VALLEY CENTER, CA 92082-1033
PO BOX 1034, VALLEY CENTER, CA 92082-1034
PO BOX 1035, VALLEY CENTER, CA 92082-1035
PO BOX 1036, VALLEY CENTER, CA 92082-1036
PO BOX 1037, VALLEY CENTER, CA 92082-1037
PO BOX 1038, VALLEY CENTER, CA 92082-1038
PO BOX 1039, VALLEY CENTER, CA 92082-1039
PO BOX 1040, VALLEY CENTER, CA 92082-1040
PO BOX 1041, VALLEY CENTER, CA 92082-1041
PO BOX 1042, VALLEY CENTER, CA 92082-1042
PO BOX 1043, VALLEY CENTER, CA 92082-1043
PO BOX 1044, VALLEY CENTER, CA 92082-1044
PO BOX 1045, VALLEY CENTER, CA 92082-1045
PO BOX 1046, VALLEY CENTER, CA 92082-1046
PO BOX 1047, VALLEY CENTER, CA 92082-1047
PO BOX 1048, VALLEY CENTER, CA 92082-1048
PO BOX 1049, VALLEY CENTER, CA 92082-1049
PO BOX 1050, VALLEY CENTER, CA 92082-1050
PO BOX 1051, VALLEY CENTER, CA 92082-1051
PO BOX 1052, VALLEY CENTER, CA 92082-1052
PO BOX 1053, VALLEY CENTER, CA 92082-1053
PO BOX 1054, VALLEY CENTER, CA 92082-1054
PO BOX 1055, VALLEY CENTER, CA 92082-1055
PO BOX 1056, VALLEY CENTER, CA 92082-1056
PO BOX 1057, VALLEY CENTER, CA 92082-1057
PO BOX 1058, VALLEY CENTER, CA 92082-1058
PO BOX 1059, VALLEY CENTER, CA 92082-1059
PO BOX 1060, VALLEY CENTER, CA 92082-1060
PO BOX 1061, VALLEY CENTER, CA 92082-1061
PO BOX 1062, VALLEY CENTER, CA 92082-1062
PO BOX 1063, VALLEY CENTER, CA 92082-1063
PO BOX 1064, VALLEY CENTER, CA 92082-1064
PO BOX 1065, VALLEY CENTER, CA 92082-1065
PO BOX 1066, VALLEY CENTER, CA 92082-1066
PO BOX 1067, VALLEY CENTER, CA 92082-1067
PO BOX 1068, VALLEY CENTER, CA 92082-1068
PO BOX 1069, VALLEY CENTER, CA 92082-1069
PO BOX 1070, VALLEY CENTER, CA 92082-1070
PO BOX 1071, VALLEY CENTER, CA 92082-1071
PO BOX 1072, VALLEY CENTER, CA 92082-1072
PO BOX 1073, VALLEY CENTER, CA 92082-1073
PO BOX 1074, VALLEY CENTER, CA 92082-1074
PO BOX 1075, VALLEY CENTER, CA 92082-1075
PO BOX 1076, VALLEY CENTER, CA 92082-1076
PO BOX 1077, VALLEY CENTER, CA 92082-1077
PO BOX 1078, VALLEY CENTER, CA 92082-1078
PO BOX 1079, VALLEY CENTER, CA 92082-1079
PO BOX 1080, VALLEY CENTER, CA 92082-1080
PO BOX 1081, VALLEY CENTER, CA 92082-1081
PO BOX 1082, VALLEY CENTER, CA 92082-1082
PO BOX 1083, VALLEY CENTER, CA 92082-1083
PO BOX 1084, VALLEY CENTER, CA 92082-1084
PO BOX 1085, VALLEY CENTER, CA 92082-1085
PO BOX 1086, VALLEY CENTER, CA 92082-1086
PO BOX 1087, VALLEY CENTER, CA 92082-1087
PO BOX 1088, VALLEY CENTER, CA 92082-1088
PO BOX 1089, VALLEY CENTER, CA 92082-1089
PO BOX 1090, VALLEY CENTER, CA 92082-1090
PO BOX 1091, VALLEY CENTER, CA 92082-1091
PO BOX 1092, VALLEY CENTER, CA 92082-1092
PO BOX 1093, VALLEY CENTER, CA 92082-1093
PO BOX 1094, VALLEY CENTER, CA 92082-1094
PO BOX 1095, VALLEY CENTER, CA 92082-1095
PO BOX 1096, VALLEY CENTER, CA 92082-1096
PO BOX 1097, VALLEY CENTER, CA 92082-1097
PO BOX 1098, VALLEY CENTER, CA 92082-1098
PO BOX 1099, VALLEY CENTER, CA 92082-1099
PO BOX 1100, VALLEY CENTER, CA 92082-1100
PO BOX 1101, VALLEY CENTER, CA 92082-1101
PO BOX 1102, VALLEY CENTER, CA 92082-1102
PO BOX 1103, VALLEY CENTER, CA 92082-1103
PO BOX 1104, VALLEY CENTER, CA 92082-1104
PO BOX 1105, VALLEY CENTER, CA 92082-1105
PO BOX 1106, VALLEY CENTER, CA 92082-1106
PO BOX 1107, VALLEY CENTER, CA 92082-1107
PO BOX 1108, VALLEY CENTER, CA 92082-1108
PO BOX 1109, VALLEY CENTER, CA 92082-1109
PO BOX 1110, VALLEY CENTER, CA 92082-1110
PO BOX 1111, VALLEY CENTER, CA 92082-1111
PO BOX 1112, VALLEY CENTER, CA 92082-1112
PO BOX 1113, VALLEY CENTER, CA 92082-1113
PO BOX 1114, VALLEY CENTER, CA 92082-1114
PO BOX 1115, VALLEY CENTER, CA 92082-1115
PO BOX 1116, VALLEY CENTER, CA 92082-1116
PO BOX 1117, VALLEY CENTER, CA 92082-1117
PO BOX 1118, VALLEY CENTER, CA 92082-1118
PO BOX 1119, VALLEY CENTER, CA 92082-1119
PO BOX 1120, VALLEY CENTER, CA 92082-1120
PO BOX 1121, VALLEY CENTER, CA 92082-1121
PO BOX 1122, VALLEY CENTER, CA 92082-1122
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