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 1081, SIOUX FALLS, SD 57101-1081
PO BOX 1082, SIOUX FALLS, SD 57101-1082
PO BOX 1083, SIOUX FALLS, SD 57101-1083
PO BOX 1084, SIOUX FALLS, SD 57101-1084
PO BOX 1085, SIOUX FALLS, SD 57101-1085
PO BOX 1086, SIOUX FALLS, SD 57101-1086
PO BOX 1087, SIOUX FALLS, SD 57101-1087
PO BOX 1088, SIOUX FALLS, SD 57101-1088
PO BOX 1089, SIOUX FALLS, SD 57101-1089
PO BOX 1090, SIOUX FALLS, SD 57101-1090
PO BOX 1091, SIOUX FALLS, SD 57101-1091
PO BOX 1092, SIOUX FALLS, SD 57101-1092
PO BOX 1093, SIOUX FALLS, SD 57101-1093
PO BOX 1094, SIOUX FALLS, SD 57101-1094
PO BOX 1095, SIOUX FALLS, SD 57101-1095
PO BOX 1096, SIOUX FALLS, SD 57101-1096
PO BOX 1097, SIOUX FALLS, SD 57101-1097
PO BOX 1098, SIOUX FALLS, SD 57101-1098
PO BOX 1099, SIOUX FALLS, SD 57101-1099
PO BOX 1100, SIOUX FALLS, SD 57101-1100
PO BOX 1101, SIOUX FALLS, SD 57101-1101
PO BOX 1102, SIOUX FALLS, SD 57101-1102
PO BOX 1103, SIOUX FALLS, SD 57101-1103
PO BOX 1104, SIOUX FALLS, SD 57101-1104
PO BOX 1105, SIOUX FALLS, SD 57101-1105
PO BOX 1106, SIOUX FALLS, SD 57101-1106
PO BOX 1107, SIOUX FALLS, SD 57101-1107
PO BOX 1108, SIOUX FALLS, SD 57101-1108
PO BOX 1109, SIOUX FALLS, SD 57101-1109
PO BOX 1110, SIOUX FALLS, SD 57101-1110
PO BOX 1111, SIOUX FALLS, SD 57101-1111
PO BOX 1112, SIOUX FALLS, SD 57101-1112
PO BOX 1113, SIOUX FALLS, SD 57101-1113
PO BOX 1114, SIOUX FALLS, SD 57101-1114
PO BOX 1115, SIOUX FALLS, SD 57101-1115
PO BOX 1116, SIOUX FALLS, SD 57101-1116
PO BOX 1117, SIOUX FALLS, SD 57101-1117
PO BOX 1118, SIOUX FALLS, SD 57101-1118
PO BOX 1119, SIOUX FALLS, SD 57101-1119
PO BOX 1120, SIOUX FALLS, SD 57101-1120
PO BOX 1121, SIOUX FALLS, SD 57101-1121
PO BOX 1122, SIOUX FALLS, SD 57101-1122
PO BOX 1123, SIOUX FALLS, SD 57101-1123
PO BOX 1124, SIOUX FALLS, SD 57101-1124
PO BOX 1125, SIOUX FALLS, SD 57101-1125
PO BOX 1126, SIOUX FALLS, SD 57101-1126
PO BOX 1127, SIOUX FALLS, SD 57101-1127
PO BOX 1128, SIOUX FALLS, SD 57101-1128
PO BOX 1129, SIOUX FALLS, SD 57101-1129
PO BOX 1130, SIOUX FALLS, SD 57101-1130
PO BOX 1131, SIOUX FALLS, SD 57101-1131
PO BOX 1132, SIOUX FALLS, SD 57101-1132
PO BOX 1133, SIOUX FALLS, SD 57101-1133
PO BOX 1134, SIOUX FALLS, SD 57101-1134
PO BOX 1135, SIOUX FALLS, SD 57101-1135
PO BOX 1136, SIOUX FALLS, SD 57101-1136
PO BOX 1137, SIOUX FALLS, SD 57101-1137
PO BOX 1138, SIOUX FALLS, SD 57101-1138
PO BOX 1139, SIOUX FALLS, SD 57101-1139
PO BOX 1140, SIOUX FALLS, SD 57101-1140
PO BOX 1141, SIOUX FALLS, SD 57101-1141
PO BOX 1142, SIOUX FALLS, SD 57101-1142
PO BOX 1143, SIOUX FALLS, SD 57101-1143
PO BOX 1144, SIOUX FALLS, SD 57101-1144
PO BOX 1145, SIOUX FALLS, SD 57101-1145
PO BOX 1146, SIOUX FALLS, SD 57101-1146
PO BOX 1147, SIOUX FALLS, SD 57101-1147
PO BOX 1148, SIOUX FALLS, SD 57101-1148
PO BOX 1149, SIOUX FALLS, SD 57101-1149
PO BOX 1150, SIOUX FALLS, SD 57101-1150
PO BOX 1151, SIOUX FALLS, SD 57101-1151
PO BOX 1152, SIOUX FALLS, SD 57101-1152
PO BOX 1153, SIOUX FALLS, SD 57101-1153
PO BOX 1154, SIOUX FALLS, SD 57101-1154
PO BOX 1155, SIOUX FALLS, SD 57101-1155
PO BOX 1156, SIOUX FALLS, SD 57101-1156
PO BOX 1157, SIOUX FALLS, SD 57101-1157
PO BOX 1158, SIOUX FALLS, SD 57101-1158
PO BOX 1159, SIOUX FALLS, SD 57101-1159
PO BOX 1160, SIOUX FALLS, SD 57101-1160
PO BOX 1161, SIOUX FALLS, SD 57101-1161
PO BOX 1162, SIOUX FALLS, SD 57101-1162
PO BOX 1163, SIOUX FALLS, SD 57101-1163
PO BOX 1164, SIOUX FALLS, SD 57101-1164
PO BOX 1165, SIOUX FALLS, SD 57101-1165
PO BOX 1166, SIOUX FALLS, SD 57101-1166
PO BOX 1167, SIOUX FALLS, SD 57101-1167
PO BOX 1168, SIOUX FALLS, SD 57101-1168
PO BOX 1169, SIOUX FALLS, SD 57101-1169
PO BOX 1170, SIOUX FALLS, SD 57101-1170
PO BOX 1171, SIOUX FALLS, SD 57101-1171
PO BOX 1172, SIOUX FALLS, SD 57101-1172
PO BOX 1173, SIOUX FALLS, SD 57101-1173
PO BOX 1174, SIOUX FALLS, SD 57101-1174
PO BOX 1175, SIOUX FALLS, SD 57101-1175
PO BOX 1176, SIOUX FALLS, SD 57101-1176
PO BOX 1177, SIOUX FALLS, SD 57101-1177
PO BOX 1178, SIOUX FALLS, SD 57101-1178
PO BOX 1179, SIOUX FALLS, SD 57101-1179
PO BOX 1180, SIOUX FALLS, SD 57101-1180
PO BOX 1181, SIOUX FALLS, SD 57101-1181
PO BOX 1182, SIOUX FALLS, SD 57101-1182
PO BOX 1183, SIOUX FALLS, SD 57101-1183
PO BOX 1184, SIOUX FALLS, SD 57101-1184
PO BOX 1185, SIOUX FALLS, SD 57101-1185
PO BOX 1186, SIOUX FALLS, SD 57101-1186
PO BOX 1187, SIOUX FALLS, SD 57101-1187
PO BOX 1188, SIOUX FALLS, SD 57101-1188
PO BOX 1189, SIOUX FALLS, SD 57101-1189
PO BOX 1190, SIOUX FALLS, SD 57101-1190
PO BOX 1191, SIOUX FALLS, SD 57101-1191
PO BOX 1192, SIOUX FALLS, SD 57101-1192
PO BOX 1193, SIOUX FALLS, SD 57101-1193
PO BOX 1194, SIOUX FALLS, SD 57101-1194
PO BOX 1195, SIOUX FALLS, SD 57101-1195
PO BOX 1196, SIOUX FALLS, SD 57101-1196
PO BOX 1197, SIOUX FALLS, SD 57101-1197
PO BOX 1198, SIOUX FALLS, SD 57101-1198
PO BOX 1199, SIOUX FALLS, SD 57101-1199
PO BOX 1200, SIOUX FALLS, SD 57101-1200
PO BOX 1201, SIOUX FALLS, SD 57101-1201
PO BOX 1202, SIOUX FALLS, SD 57101-1202
PO BOX 1203, SIOUX FALLS, SD 57101-1203
PO BOX 1204, SIOUX FALLS, SD 57101-1204
PO BOX 1205, SIOUX FALLS, SD 57101-1205
PO BOX 1206, SIOUX FALLS, SD 57101-1206
PO BOX 1207, SIOUX FALLS, SD 57101-1207
PO BOX 1208, SIOUX FALLS, SD 57101-1208
PO BOX 1209, SIOUX FALLS, SD 57101-1209
PO BOX 1210, SIOUX FALLS, SD 57101-1210
PO BOX 1211, SIOUX FALLS, SD 57101-1211
PO BOX 1212, SIOUX FALLS, SD 57101-1212
PO BOX 1213, SIOUX FALLS, SD 57101-1213
PO BOX 1214, SIOUX FALLS, SD 57101-1214
PO BOX 1215, SIOUX FALLS, SD 57101-1215
PO BOX 1216, SIOUX FALLS, SD 57101-1216
PO BOX 1217, SIOUX FALLS, SD 57101-1217
PO BOX 1218, SIOUX FALLS, SD 57101-1218
PO BOX 1219, SIOUX FALLS, SD 57101-1219
PO BOX 1220, SIOUX FALLS, SD 57101-1220
PO BOX 1221, SIOUX FALLS, SD 57101-1221
PO BOX 1222, SIOUX FALLS, SD 57101-1222
PO BOX 1223, SIOUX FALLS, SD 57101-1223
PO BOX 1224, SIOUX FALLS, SD 57101-1224
PO BOX 1225, SIOUX FALLS, SD 57101-1225
PO BOX 1226, SIOUX FALLS, SD 57101-1226
PO BOX 1227, SIOUX FALLS, SD 57101-1227
PO BOX 1228, SIOUX FALLS, SD 57101-1228
PO BOX 1229, SIOUX FALLS, SD 57101-1229
PO BOX 1230, SIOUX FALLS, SD 57101-1230
PO BOX 1231, SIOUX FALLS, SD 57101-1231
PO BOX 1232, SIOUX FALLS, SD 57101-1232
PO BOX 1233, SIOUX FALLS, SD 57101-1233
PO BOX 1234, SIOUX FALLS, SD 57101-1234
PO BOX 1235, SIOUX FALLS, SD 57101-1235
PO BOX 1236, SIOUX FALLS, SD 57101-1236
PO BOX 1237, SIOUX FALLS, SD 57101-1237
PO BOX 1238, SIOUX FALLS, SD 57101-1238
PO BOX 1239, SIOUX FALLS, SD 57101-1239
PO BOX 1240, SIOUX FALLS, SD 57101-1240
PO BOX 1241, SIOUX FALLS, SD 57101-1241
PO BOX 1242, SIOUX FALLS, SD 57101-1242
PO BOX 1243, SIOUX FALLS, SD 57101-1243
PO BOX 1244, SIOUX FALLS, SD 57101-1244
PO BOX 1245, SIOUX FALLS, SD 57101-1245
PO BOX 1246, SIOUX FALLS, SD 57101-1246
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