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 971, POSTVILLE, IA 52162-0971
PO BOX 972, POSTVILLE, IA 52162-0972
PO BOX 973, POSTVILLE, IA 52162-0973
PO BOX 974, POSTVILLE, IA 52162-0974
PO BOX 975, POSTVILLE, IA 52162-0975
PO BOX 976, POSTVILLE, IA 52162-0976
PO BOX 977, POSTVILLE, IA 52162-0977
PO BOX 978, POSTVILLE, IA 52162-0978
PO BOX 979, POSTVILLE, IA 52162-0979
PO BOX 980, POSTVILLE, IA 52162-0980
PO BOX 981, POSTVILLE, IA 52162-0981
PO BOX 982, POSTVILLE, IA 52162-0982
PO BOX 983, POSTVILLE, IA 52162-0983
PO BOX 984, POSTVILLE, IA 52162-0984
PO BOX 985, POSTVILLE, IA 52162-0985
PO BOX 986, POSTVILLE, IA 52162-0986
PO BOX 987, POSTVILLE, IA 52162-0987
PO BOX 988, POSTVILLE, IA 52162-0988
PO BOX 989, POSTVILLE, IA 52162-0989
PO BOX 990, POSTVILLE, IA 52162-0990
PO BOX 991, POSTVILLE, IA 52162-0991
PO BOX 992, POSTVILLE, IA 52162-0992
PO BOX 993, POSTVILLE, IA 52162-0993
PO BOX 994, POSTVILLE, IA 52162-0994
PO BOX 995, POSTVILLE, IA 52162-0995
PO BOX 996, POSTVILLE, IA 52162-0996
PO BOX 997, POSTVILLE, IA 52162-0997
PO BOX 998, POSTVILLE, IA 52162-0998
PO BOX 999, POSTVILLE, IA 52162-0999
PO BOX 1000, POSTVILLE, IA 52162-1000
PO BOX 1001, POSTVILLE, IA 52162-1001
PO BOX 1002, POSTVILLE, IA 52162-1002
PO BOX 1003, POSTVILLE, IA 52162-1003
PO BOX 1004, POSTVILLE, IA 52162-1004
PO BOX 1005, POSTVILLE, IA 52162-1005
PO BOX 1006, POSTVILLE, IA 52162-1006
PO BOX 1007, POSTVILLE, IA 52162-1007
PO BOX 1008, POSTVILLE, IA 52162-1008
PO BOX 1009, POSTVILLE, IA 52162-1009
PO BOX 1010, POSTVILLE, IA 52162-1010
PO BOX 1011, POSTVILLE, IA 52162-1011
PO BOX 1012, POSTVILLE, IA 52162-1012
PO BOX 1013, POSTVILLE, IA 52162-1013
PO BOX 1014, POSTVILLE, IA 52162-1014
PO BOX 1015, POSTVILLE, IA 52162-1015
PO BOX 1016, POSTVILLE, IA 52162-1016
PO BOX 1017, POSTVILLE, IA 52162-1017
PO BOX 1018, POSTVILLE, IA 52162-1018
PO BOX 1019, POSTVILLE, IA 52162-1019
PO BOX 1020, POSTVILLE, IA 52162-1020
PO BOX 1021, POSTVILLE, IA 52162-1021
PO BOX 1022, POSTVILLE, IA 52162-1022
PO BOX 1023, POSTVILLE, IA 52162-1023
PO BOX 1024, POSTVILLE, IA 52162-1024
PO BOX 1025, POSTVILLE, IA 52162-1025
PO BOX 1026, POSTVILLE, IA 52162-1026
PO BOX 1027, POSTVILLE, IA 52162-1027
PO BOX 1028, POSTVILLE, IA 52162-1028
PO BOX 1029, POSTVILLE, IA 52162-1029
PO BOX 1030, POSTVILLE, IA 52162-1030
PO BOX 1031, POSTVILLE, IA 52162-1031
PO BOX 1032, POSTVILLE, IA 52162-1032
PO BOX 1033, POSTVILLE, IA 52162-1033
PO BOX 1034, POSTVILLE, IA 52162-1034
PO BOX 1035, POSTVILLE, IA 52162-1035
PO BOX 1036, POSTVILLE, IA 52162-1036
PO BOX 1037, POSTVILLE, IA 52162-1037
PO BOX 1038, POSTVILLE, IA 52162-1038
PO BOX 1039, POSTVILLE, IA 52162-1039
PO BOX 1040, POSTVILLE, IA 52162-1040
PO BOX 1041, POSTVILLE, IA 52162-1041
PO BOX 1042, POSTVILLE, IA 52162-1042
PO BOX 1043, POSTVILLE, IA 52162-1043
PO BOX 1044, POSTVILLE, IA 52162-1044
PO BOX 1045, POSTVILLE, IA 52162-1045
PO BOX 1046, POSTVILLE, IA 52162-1046
PO BOX 1047, POSTVILLE, IA 52162-1047
PO BOX 1048, POSTVILLE, IA 52162-1048
PO BOX 1049, POSTVILLE, IA 52162-1049
PO BOX 1050, POSTVILLE, IA 52162-1050
PO BOX 1051, POSTVILLE, IA 52162-1051
PO BOX 1052, POSTVILLE, IA 52162-1052
PO BOX 1053, POSTVILLE, IA 52162-1053
PO BOX 1054, POSTVILLE, IA 52162-1054
PO BOX 1055, POSTVILLE, IA 52162-1055
PO BOX 1056, POSTVILLE, IA 52162-1056
PO BOX 1057, POSTVILLE, IA 52162-1057
PO BOX 1058, POSTVILLE, IA 52162-1058
PO BOX 1059, POSTVILLE, IA 52162-1059
PO BOX 1060, POSTVILLE, IA 52162-1060
PO BOX 1061, POSTVILLE, IA 52162-1061
PO BOX 1062, POSTVILLE, IA 52162-1062
PO BOX 1063, POSTVILLE, IA 52162-1063
PO BOX 1064, POSTVILLE, IA 52162-1064
PO BOX 1065, POSTVILLE, IA 52162-1065
PO BOX 1066, POSTVILLE, IA 52162-1066
PO BOX 1067, POSTVILLE, IA 52162-1067
PO BOX 1068, POSTVILLE, IA 52162-1068
PO BOX 1069, POSTVILLE, IA 52162-1069
PO BOX 1070, POSTVILLE, IA 52162-1070
PO BOX 1071, POSTVILLE, IA 52162-1071
PO BOX 1072, POSTVILLE, IA 52162-1072
PO BOX 1073, POSTVILLE, IA 52162-1073
PO BOX 1074, POSTVILLE, IA 52162-1074
PO BOX 1075, POSTVILLE, IA 52162-1075
PO BOX 1076, POSTVILLE, IA 52162-1076
PO BOX 1077, POSTVILLE, IA 52162-1077
PO BOX 1078, POSTVILLE, IA 52162-1078
PO BOX 1079, POSTVILLE, IA 52162-1079
PO BOX 1080, POSTVILLE, IA 52162-1080
PO BOX 1081, POSTVILLE, IA 52162-1081
PO BOX 1082, POSTVILLE, IA 52162-1082
PO BOX 1083, POSTVILLE, IA 52162-1083
PO BOX 1084, POSTVILLE, IA 52162-1084
PO BOX 1085, POSTVILLE, IA 52162-1085
PO BOX 1086, POSTVILLE, IA 52162-1086
PO BOX 1087, POSTVILLE, IA 52162-1087
PO BOX 1088, POSTVILLE, IA 52162-1088
PO BOX 1089, POSTVILLE, IA 52162-1089
PO BOX 1090, POSTVILLE, IA 52162-1090
PO BOX 1091, POSTVILLE, IA 52162-1091
PO BOX 1092, POSTVILLE, IA 52162-1092
PO BOX 1093, POSTVILLE, IA 52162-1093
PO BOX 1094, POSTVILLE, IA 52162-1094
PO BOX 1095, POSTVILLE, IA 52162-1095
PO BOX 1096, POSTVILLE, IA 52162-1096
PO BOX 1097, POSTVILLE, IA 52162-1097
PO BOX 1098, POSTVILLE, IA 52162-1098
PO BOX 1099, POSTVILLE, IA 52162-1099
PO BOX 1100, POSTVILLE, IA 52162-1100
PO BOX 1101, POSTVILLE, IA 52162-1101
PO BOX 1102, POSTVILLE, IA 52162-1102
PO BOX 1103, POSTVILLE, IA 52162-1103
PO BOX 1104, POSTVILLE, IA 52162-1104
PO BOX 1105, POSTVILLE, IA 52162-1105
PO BOX 1106, POSTVILLE, IA 52162-1106
PO BOX 1107, POSTVILLE, IA 52162-1107
PO BOX 1108, POSTVILLE, IA 52162-1108
PO BOX 1109, POSTVILLE, IA 52162-1109
PO BOX 1110, POSTVILLE, IA 52162-1110
PO BOX 1111, POSTVILLE, IA 52162-1111
PO BOX 1112, POSTVILLE, IA 52162-1112
PO BOX 1113, POSTVILLE, IA 52162-1113
PO BOX 1114, POSTVILLE, IA 52162-1114
PO BOX 1115, POSTVILLE, IA 52162-1115
PO BOX 1116, POSTVILLE, IA 52162-1116
PO BOX 1117, POSTVILLE, IA 52162-1117
PO BOX 1118, POSTVILLE, IA 52162-1118
PO BOX 1119, POSTVILLE, IA 52162-1119
PO BOX 1120, POSTVILLE, IA 52162-1120
PO BOX 1121, POSTVILLE, IA 52162-1121
PO BOX 1122, POSTVILLE, IA 52162-1122
PO BOX 1123, POSTVILLE, IA 52162-1123
PO BOX 1124, POSTVILLE, IA 52162-1124
PO BOX 1125, POSTVILLE, IA 52162-1125
PO BOX 1126, POSTVILLE, IA 52162-1126
PO BOX 1127, POSTVILLE, IA 52162-1127
PO BOX 1128, POSTVILLE, IA 52162-1128
PO BOX 1129, POSTVILLE, IA 52162-1129
PO BOX 1130, POSTVILLE, IA 52162-1130
PO BOX 1131, POSTVILLE, IA 52162-1131
PO BOX 1132, POSTVILLE, IA 52162-1132
PO BOX 1133, POSTVILLE, IA 52162-1133
PO BOX 1134, POSTVILLE, IA 52162-1134
PO BOX 1135, POSTVILLE, IA 52162-1135
PO BOX 1136, POSTVILLE, IA 52162-1136
PO BOX 1137, POSTVILLE, IA 52162-1137
PO BOX 1138, POSTVILLE, IA 52162-1138
PO BOX 1139, POSTVILLE, IA 52162-1139
PO BOX 1140, POSTVILLE, IA 52162-1140
PO BOX 1141, POSTVILLE, IA 52162-1141
PO BOX 1142, POSTVILLE, IA 52162-1142
PO BOX 1143, POSTVILLE, IA 52162-1143
PO BOX 1144, POSTVILLE, IA 52162-1144
PO BOX 1145, POSTVILLE, IA 52162-1145
PO BOX 1146, POSTVILLE, IA 52162-1146
PO BOX 1147, POSTVILLE, IA 52162-1147
PO BOX 1148, POSTVILLE, IA 52162-1148
PO BOX 1149, POSTVILLE, IA 52162-1149
PO BOX 1150, POSTVILLE, IA 52162-1150
PO BOX 1151, POSTVILLE, IA 52162-1151
PO BOX 1152, POSTVILLE, IA 52162-1152
PO BOX 1153, POSTVILLE, IA 52162-1153
PO BOX 1154, POSTVILLE, IA 52162-1154
PO BOX 1155, POSTVILLE, IA 52162-1155
PO BOX 1156, POSTVILLE, IA 52162-1156
PO BOX 1157, POSTVILLE, IA 52162-1157
PO BOX 1158, POSTVILLE, IA 52162-1158
PO BOX 1159, POSTVILLE, IA 52162-1159
PO BOX 1160, POSTVILLE, IA 52162-1160
PO BOX 1161, POSTVILLE, IA 52162-1161
PO BOX 1162, POSTVILLE, IA 52162-1162
PO BOX 1163, POSTVILLE, IA 52162-1163
PO BOX 1164, POSTVILLE, IA 52162-1164
PO BOX 1165, POSTVILLE, IA 52162-1165
PO BOX 1166, POSTVILLE, IA 52162-1166
PO BOX 1167, POSTVILLE, IA 52162-1167
PO BOX 1168, POSTVILLE, IA 52162-1168
PO BOX 1169, POSTVILLE, IA 52162-1169
PO BOX 1170, POSTVILLE, IA 52162-1170
PO BOX 1171, POSTVILLE, IA 52162-1171
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