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 961, SIOUX CITY, IA 51102-0961
PO BOX 962, SIOUX CITY, IA 51102-0962
PO BOX 963, SIOUX CITY, IA 51102-0963
PO BOX 964, SIOUX CITY, IA 51102-0964
PO BOX 965, SIOUX CITY, IA 51102-0965
PO BOX 966, SIOUX CITY, IA 51102-0966
PO BOX 967, SIOUX CITY, IA 51102-0967
PO BOX 968, SIOUX CITY, IA 51102-0968
PO BOX 969, SIOUX CITY, IA 51102-0969
PO BOX 970, SIOUX CITY, IA 51102-0970
PO BOX 971, SIOUX CITY, IA 51102-0971
PO BOX 972, SIOUX CITY, IA 51102-0972
PO BOX 973, SIOUX CITY, IA 51102-0973
PO BOX 974, SIOUX CITY, IA 51102-0974
PO BOX 975, SIOUX CITY, IA 51102-0975
PO BOX 976, SIOUX CITY, IA 51102-0976
PO BOX 977, SIOUX CITY, IA 51102-0977
PO BOX 978, SIOUX CITY, IA 51102-0978
PO BOX 979, SIOUX CITY, IA 51102-0979
PO BOX 980, SIOUX CITY, IA 51102-0980
PO BOX 981, SIOUX CITY, IA 51102-0981
PO BOX 982, SIOUX CITY, IA 51102-0982
PO BOX 983, SIOUX CITY, IA 51102-0983
PO BOX 984, SIOUX CITY, IA 51102-0984
PO BOX 985, SIOUX CITY, IA 51102-0985
PO BOX 986, SIOUX CITY, IA 51102-0986
PO BOX 987, SIOUX CITY, IA 51102-0987
PO BOX 988, SIOUX CITY, IA 51102-0988
PO BOX 989, SIOUX CITY, IA 51102-0989
PO BOX 990, SIOUX CITY, IA 51102-0990
PO BOX 991, SIOUX CITY, IA 51102-0991
PO BOX 992, SIOUX CITY, IA 51102-0992
PO BOX 993, SIOUX CITY, IA 51102-0993
PO BOX 994, SIOUX CITY, IA 51102-0994
PO BOX 995, SIOUX CITY, IA 51102-0995
PO BOX 996, SIOUX CITY, IA 51102-0996
PO BOX 997, SIOUX CITY, IA 51102-0997
PO BOX 998, SIOUX CITY, IA 51102-0998
PO BOX 999, SIOUX CITY, IA 51102-0999
PO BOX 1000, SIOUX CITY, IA 51102-1000
PO BOX 1001, SIOUX CITY, IA 51102-1001
PO BOX 1002, SIOUX CITY, IA 51102-1002
PO BOX 1003, SIOUX CITY, IA 51102-1003
PO BOX 1004, SIOUX CITY, IA 51102-1004
PO BOX 1005, SIOUX CITY, IA 51102-1005
PO BOX 1006, SIOUX CITY, IA 51102-1006
PO BOX 1007, SIOUX CITY, IA 51102-1007
PO BOX 1008, SIOUX CITY, IA 51102-1008
PO BOX 1009, SIOUX CITY, IA 51102-1009
PO BOX 1010, SIOUX CITY, IA 51102-1010
PO BOX 1011, SIOUX CITY, IA 51102-1011
PO BOX 1012, SIOUX CITY, IA 51102-1012
PO BOX 1013, SIOUX CITY, IA 51102-1013
PO BOX 1014, SIOUX CITY, IA 51102-1014
PO BOX 1015, SIOUX CITY, IA 51102-1015
PO BOX 1016, SIOUX CITY, IA 51102-1016
PO BOX 1017, SIOUX CITY, IA 51102-1017
PO BOX 1018, SIOUX CITY, IA 51102-1018
PO BOX 1019, SIOUX CITY, IA 51102-1019
PO BOX 1020, SIOUX CITY, IA 51102-1020
PO BOX 1021, SIOUX CITY, IA 51102-1021
PO BOX 1022, SIOUX CITY, IA 51102-1022
PO BOX 1023, SIOUX CITY, IA 51102-1023
PO BOX 1024, SIOUX CITY, IA 51102-1024
PO BOX 1025, SIOUX CITY, IA 51102-1025
PO BOX 1026, SIOUX CITY, IA 51102-1026
PO BOX 1027, SIOUX CITY, IA 51102-1027
PO BOX 1028, SIOUX CITY, IA 51102-1028
PO BOX 1029, SIOUX CITY, IA 51102-1029
PO BOX 1030, SIOUX CITY, IA 51102-1030
PO BOX 1031, SIOUX CITY, IA 51102-1031
PO BOX 1032, SIOUX CITY, IA 51102-1032
PO BOX 1033, SIOUX CITY, IA 51102-1033
PO BOX 1034, SIOUX CITY, IA 51102-1034
PO BOX 1035, SIOUX CITY, IA 51102-1035
PO BOX 1036, SIOUX CITY, IA 51102-1036
PO BOX 1037, SIOUX CITY, IA 51102-1037
PO BOX 1038, SIOUX CITY, IA 51102-1038
PO BOX 1039, SIOUX CITY, IA 51102-1039
PO BOX 1040, SIOUX CITY, IA 51102-1040
PO BOX 1041, SIOUX CITY, IA 51102-1041
PO BOX 1042, SIOUX CITY, IA 51102-1042
PO BOX 1043, SIOUX CITY, IA 51102-1043
PO BOX 1044, SIOUX CITY, IA 51102-1044
PO BOX 1045, SIOUX CITY, IA 51102-1045
PO BOX 1046, SIOUX CITY, IA 51102-1046
PO BOX 1047, SIOUX CITY, IA 51102-1047
PO BOX 1048, SIOUX CITY, IA 51102-1048
PO BOX 1049, SIOUX CITY, IA 51102-1049
PO BOX 1050, SIOUX CITY, IA 51102-1050
PO BOX 1051, SIOUX CITY, IA 51102-1051
PO BOX 1052, SIOUX CITY, IA 51102-1052
PO BOX 1053, SIOUX CITY, IA 51102-1053
PO BOX 1054, SIOUX CITY, IA 51102-1054
PO BOX 1055, SIOUX CITY, IA 51102-1055
PO BOX 1056, SIOUX CITY, IA 51102-1056
PO BOX 1057, SIOUX CITY, IA 51102-1057
PO BOX 1058, SIOUX CITY, IA 51102-1058
PO BOX 1059, SIOUX CITY, IA 51102-1059
PO BOX 1060, SIOUX CITY, IA 51102-1060
PO BOX 1061, SIOUX CITY, IA 51102-1061
PO BOX 1062, SIOUX CITY, IA 51102-1062
PO BOX 1063, SIOUX CITY, IA 51102-1063
PO BOX 1064, SIOUX CITY, IA 51102-1064
PO BOX 1065, SIOUX CITY, IA 51102-1065
PO BOX 1066, SIOUX CITY, IA 51102-1066
PO BOX 1067, SIOUX CITY, IA 51102-1067
PO BOX 1068, SIOUX CITY, IA 51102-1068
PO BOX 1069, SIOUX CITY, IA 51102-1069
PO BOX 1070, SIOUX CITY, IA 51102-1070
PO BOX 1071, SIOUX CITY, IA 51102-1071
PO BOX 1072, SIOUX CITY, IA 51102-1072
PO BOX 1073, SIOUX CITY, IA 51102-1073
PO BOX 1074, SIOUX CITY, IA 51102-1074
PO BOX 1075, SIOUX CITY, IA 51102-1075
PO BOX 1076, SIOUX CITY, IA 51102-1076
PO BOX 1077, SIOUX CITY, IA 51102-1077
PO BOX 1078, SIOUX CITY, IA 51102-1078
PO BOX 1079, SIOUX CITY, IA 51102-1079
PO BOX 1080, SIOUX CITY, IA 51102-1080
PO BOX 1081, SIOUX CITY, IA 51102-1081
PO BOX 1082, SIOUX CITY, IA 51102-1082
PO BOX 1083, SIOUX CITY, IA 51102-1083
PO BOX 1084, SIOUX CITY, IA 51102-1084
PO BOX 1085, SIOUX CITY, IA 51102-1085
PO BOX 1086, SIOUX CITY, IA 51102-1086
PO BOX 1087, SIOUX CITY, IA 51102-1087
PO BOX 1088, SIOUX CITY, IA 51102-1088
PO BOX 1089, SIOUX CITY, IA 51102-1089
PO BOX 1090, SIOUX CITY, IA 51102-1090
PO BOX 1091, SIOUX CITY, IA 51102-1091
PO BOX 1092, SIOUX CITY, IA 51102-1092
PO BOX 1093, SIOUX CITY, IA 51102-1093
PO BOX 1094, SIOUX CITY, IA 51102-1094
PO BOX 1095, SIOUX CITY, IA 51102-1095
PO BOX 1096, SIOUX CITY, IA 51102-1096
PO BOX 1097, SIOUX CITY, IA 51102-1097
PO BOX 1098, SIOUX CITY, IA 51102-1098
PO BOX 1099, SIOUX CITY, IA 51102-1099
PO BOX 1100, SIOUX CITY, IA 51102-1100
PO BOX 1101, SIOUX CITY, IA 51102-1101
PO BOX 1102, SIOUX CITY, IA 51102-1102
PO BOX 1103, SIOUX CITY, IA 51102-1103
PO BOX 1104, SIOUX CITY, IA 51102-1104
PO BOX 1105, SIOUX CITY, IA 51102-1105
PO BOX 1106, SIOUX CITY, IA 51102-1106
PO BOX 1107, SIOUX CITY, IA 51102-1107
PO BOX 1108, SIOUX CITY, IA 51102-1108
PO BOX 1109, SIOUX CITY, IA 51102-1109
PO BOX 1110, SIOUX CITY, IA 51102-1110
PO BOX 1111, SIOUX CITY, IA 51102-1111
PO BOX 1112, SIOUX CITY, IA 51102-1112
PO BOX 1113, SIOUX CITY, IA 51102-1113
PO BOX 1114, SIOUX CITY, IA 51102-1114
PO BOX 1115, SIOUX CITY, IA 51102-1115
PO BOX 1116, SIOUX CITY, IA 51102-1116
PO BOX 1117, SIOUX CITY, IA 51102-1117
PO BOX 1118, SIOUX CITY, IA 51102-1118
PO BOX 1119, SIOUX CITY, IA 51102-1119
PO BOX 1120, SIOUX CITY, IA 51102-1120
PO BOX 1121, SIOUX CITY, IA 51102-1121
PO BOX 1122, SIOUX CITY, IA 51102-1122
PO BOX 1123, SIOUX CITY, IA 51102-1123
PO BOX 1124, SIOUX CITY, IA 51102-1124
PO BOX 1125, SIOUX CITY, IA 51102-1125
PO BOX 1126, SIOUX CITY, IA 51102-1126
PO BOX 1127, SIOUX CITY, IA 51102-1127
PO BOX 1128, SIOUX CITY, IA 51102-1128
PO BOX 1129, SIOUX CITY, IA 51102-1129
PO BOX 1130, SIOUX CITY, IA 51102-1130
PO BOX 1131, SIOUX CITY, IA 51102-1131
PO BOX 1132, SIOUX CITY, IA 51102-1132
PO BOX 1133, SIOUX CITY, IA 51102-1133
PO BOX 1134, SIOUX CITY, IA 51102-1134
PO BOX 1135, SIOUX CITY, IA 51102-1135
PO BOX 1136, SIOUX CITY, IA 51102-1136
PO BOX 1137, SIOUX CITY, IA 51102-1137
PO BOX 1138, SIOUX CITY, IA 51102-1138
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