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 5600, HARLAN, IA 51593-1100
PO BOX 5601, HARLAN, IA 51593-1101
PO BOX 5602, HARLAN, IA 51593-1102
PO BOX 5603, HARLAN, IA 51593-1103
PO BOX 5604, HARLAN, IA 51593-1104
PO BOX 5605, HARLAN, IA 51593-1105
PO BOX 5606, HARLAN, IA 51593-1106
PO BOX 5607, HARLAN, IA 51593-1107
PO BOX 5608, HARLAN, IA 51593-1108
PO BOX 5609, HARLAN, IA 51593-1109
PO BOX 5610, HARLAN, IA 51593-1110
PO BOX 5611, HARLAN, IA 51593-1111
PO BOX 5612, HARLAN, IA 51593-1112
PO BOX 5613, HARLAN, IA 51593-1113
PO BOX 5614, HARLAN, IA 51593-1114
PO BOX 5615, HARLAN, IA 51593-1115
PO BOX 5616, HARLAN, IA 51593-1116
PO BOX 5617, HARLAN, IA 51593-1117
PO BOX 5618, HARLAN, IA 51593-1118
PO BOX 5619, HARLAN, IA 51593-1119
PO BOX 5620, HARLAN, IA 51593-1120
PO BOX 5621, HARLAN, IA 51593-1121
PO BOX 5622, HARLAN, IA 51593-1122
PO BOX 5623, HARLAN, IA 51593-1123
PO BOX 5624, HARLAN, IA 51593-1124
PO BOX 5625, HARLAN, IA 51593-1125
PO BOX 5626, HARLAN, IA 51593-1126
PO BOX 5627, HARLAN, IA 51593-1127
PO BOX 5628, HARLAN, IA 51593-1128
PO BOX 5629, HARLAN, IA 51593-1129
PO BOX 5630, HARLAN, IA 51593-1130
PO BOX 5631, HARLAN, IA 51593-1131
PO BOX 5632, HARLAN, IA 51593-1132
PO BOX 5633, HARLAN, IA 51593-1133
PO BOX 5634, HARLAN, IA 51593-1134
PO BOX 5635, HARLAN, IA 51593-1135
PO BOX 5636, HARLAN, IA 51593-1136
PO BOX 5637, HARLAN, IA 51593-1137
PO BOX 5638, HARLAN, IA 51593-1138
PO BOX 5639, HARLAN, IA 51593-1139
PO BOX 5640, HARLAN, IA 51593-1140
PO BOX 5641, HARLAN, IA 51593-1141
PO BOX 5642, HARLAN, IA 51593-1142
PO BOX 5643, HARLAN, IA 51593-1143
PO BOX 5644, HARLAN, IA 51593-1144
PO BOX 5645, HARLAN, IA 51593-1145
PO BOX 5646, HARLAN, IA 51593-1146
PO BOX 5647, HARLAN, IA 51593-1147
PO BOX 5648, HARLAN, IA 51593-1148
PO BOX 5649, HARLAN, IA 51593-1149
PO BOX 5650, HARLAN, IA 51593-1150
PO BOX 5651, HARLAN, IA 51593-1151
PO BOX 5652, HARLAN, IA 51593-1152
PO BOX 5653, HARLAN, IA 51593-1153
PO BOX 5654, HARLAN, IA 51593-1154
PO BOX 5655, HARLAN, IA 51593-1155
PO BOX 5656, HARLAN, IA 51593-1156
PO BOX 5657, HARLAN, IA 51593-1157
PO BOX 5658, HARLAN, IA 51593-1158
PO BOX 5659, HARLAN, IA 51593-1159
PO BOX 5660, HARLAN, IA 51593-1160
PO BOX 5661, HARLAN, IA 51593-1161
PO BOX 5662, HARLAN, IA 51593-1162
PO BOX 5663, HARLAN, IA 51593-1163
PO BOX 5664, HARLAN, IA 51593-1164
PO BOX 5665, HARLAN, IA 51593-1165
PO BOX 5666, HARLAN, IA 51593-1166
PO BOX 5667, HARLAN, IA 51593-1167
PO BOX 5668, HARLAN, IA 51593-1168
PO BOX 5669, HARLAN, IA 51593-1169
PO BOX 5670, HARLAN, IA 51593-1170
PO BOX 5671, HARLAN, IA 51593-1171
PO BOX 5672, HARLAN, IA 51593-1172
PO BOX 5673, HARLAN, IA 51593-1173
PO BOX 5674, HARLAN, IA 51593-1174
PO BOX 5675, HARLAN, IA 51593-1175
PO BOX 5676, HARLAN, IA 51593-1176
PO BOX 5677, HARLAN, IA 51593-1177
PO BOX 5678, HARLAN, IA 51593-1178
PO BOX 5679, HARLAN, IA 51593-1179
PO BOX 5680, HARLAN, IA 51593-1180
PO BOX 5681, HARLAN, IA 51593-1181
PO BOX 5682, HARLAN, IA 51593-1182
PO BOX 5683, HARLAN, IA 51593-1183
PO BOX 5684, HARLAN, IA 51593-1184
PO BOX 5685, HARLAN, IA 51593-1185
PO BOX 5686, HARLAN, IA 51593-1186
PO BOX 5687, HARLAN, IA 51593-1187
PO BOX 5688, HARLAN, IA 51593-1188
PO BOX 5689, HARLAN, IA 51593-1189
PO BOX 5690, HARLAN, IA 51593-1190
PO BOX 5691, HARLAN, IA 51593-1191
PO BOX 5692, HARLAN, IA 51593-1192
PO BOX 5693, HARLAN, IA 51593-1193
PO BOX 5694, HARLAN, IA 51593-1194
PO BOX 5695, HARLAN, IA 51593-1195
PO BOX 5696, HARLAN, IA 51593-1196
PO BOX 5697, HARLAN, IA 51593-1197
PO BOX 5698, HARLAN, IA 51593-1198
PO BOX 5699, HARLAN, IA 51593-1199
PO BOX 5700, HARLAN, IA 51593-1200
PO BOX 5701, HARLAN, IA 51593-1201
PO BOX 5702, HARLAN, IA 51593-1202
PO BOX 5703, HARLAN, IA 51593-1203
PO BOX 5704, HARLAN, IA 51593-1204
PO BOX 5705, HARLAN, IA 51593-1205
PO BOX 5706, HARLAN, IA 51593-1206
PO BOX 5707, HARLAN, IA 51593-1207
PO BOX 5708, HARLAN, IA 51593-1208
PO BOX 5709, HARLAN, IA 51593-1209
PO BOX 5710, HARLAN, IA 51593-1210
PO BOX 5711, HARLAN, IA 51593-1211
PO BOX 5712, HARLAN, IA 51593-1212
PO BOX 5713, HARLAN, IA 51593-1213
PO BOX 5714, HARLAN, IA 51593-1214
PO BOX 5715, HARLAN, IA 51593-1215
PO BOX 5716, HARLAN, IA 51593-1216
PO BOX 5717, HARLAN, IA 51593-1217
PO BOX 5718, HARLAN, IA 51593-1218
PO BOX 5719, HARLAN, IA 51593-1219
PO BOX 5720, HARLAN, IA 51593-1220
PO BOX 5721, HARLAN, IA 51593-1221
PO BOX 5722, HARLAN, IA 51593-1222
PO BOX 5723, HARLAN, IA 51593-1223
PO BOX 5724, HARLAN, IA 51593-1224
PO BOX 5725, HARLAN, IA 51593-1225
PO BOX 5726, HARLAN, IA 51593-1226
PO BOX 5727, HARLAN, IA 51593-1227
PO BOX 5728, HARLAN, IA 51593-1228
PO BOX 5729, HARLAN, IA 51593-1229
PO BOX 5730, HARLAN, IA 51593-1230
PO BOX 5731, HARLAN, IA 51593-1231
PO BOX 5732, HARLAN, IA 51593-1232
PO BOX 5733, HARLAN, IA 51593-1233
PO BOX 5734, HARLAN, IA 51593-1234
PO BOX 5735, HARLAN, IA 51593-1235
PO BOX 5736, HARLAN, IA 51593-1236
PO BOX 5737, HARLAN, IA 51593-1237
PO BOX 5738, HARLAN, IA 51593-1238
PO BOX 5739, HARLAN, IA 51593-1239
PO BOX 5740, HARLAN, IA 51593-1240
PO BOX 5741, HARLAN, IA 51593-1241
PO BOX 5742, HARLAN, IA 51593-1242
PO BOX 5743, HARLAN, IA 51593-1243
PO BOX 5744, HARLAN, IA 51593-1244
PO BOX 5745, HARLAN, IA 51593-1245
PO BOX 5746, HARLAN, IA 51593-1246
PO BOX 5747, HARLAN, IA 51593-1247
PO BOX 5748, HARLAN, IA 51593-1248
PO BOX 5749, HARLAN, IA 51593-1249
PO BOX 5750, HARLAN, IA 51593-1250
PO BOX 5751, HARLAN, IA 51593-1251
PO BOX 5752, HARLAN, IA 51593-1252
PO BOX 5753, HARLAN, IA 51593-1253
PO BOX 5754, HARLAN, IA 51593-1254
PO BOX 5755, HARLAN, IA 51593-1255
PO BOX 5756, HARLAN, IA 51593-1256
PO BOX 5757, HARLAN, IA 51593-1257
PO BOX 5758, HARLAN, IA 51593-1258
PO BOX 5759, HARLAN, IA 51593-1259
PO BOX 5760, HARLAN, IA 51593-1260
PO BOX 5761, HARLAN, IA 51593-1261
PO BOX 5762, HARLAN, IA 51593-1262
PO BOX 5763, HARLAN, IA 51593-1263
PO BOX 5764, HARLAN, IA 51593-1264
PO BOX 5765, HARLAN, IA 51593-1265
PO BOX 5766, HARLAN, IA 51593-1266
PO BOX 5767, HARLAN, IA 51593-1267
PO BOX 5768, HARLAN, IA 51593-1268
PO BOX 5769, HARLAN, IA 51593-1269
PO BOX 5770, HARLAN, IA 51593-1270
PO BOX 5771, HARLAN, IA 51593-1271
PO BOX 5772, HARLAN, IA 51593-1272
PO BOX 5773, HARLAN, IA 51593-1273
PO BOX 5774, HARLAN, IA 51593-1274
PO BOX 5775, HARLAN, IA 51593-1275
PO BOX 5776, HARLAN, IA 51593-1276
PO BOX 5777, HARLAN, IA 51593-1277
PO BOX 5778, HARLAN, IA 51593-1278
PO BOX 5779, HARLAN, IA 51593-1279
PO BOX 5780, HARLAN, IA 51593-1280
PO BOX 5781, HARLAN, IA 51593-1281
PO BOX 5782, HARLAN, IA 51593-1282
PO BOX 5783, HARLAN, IA 51593-1283
PO BOX 5784, HARLAN, IA 51593-1284
PO BOX 5785, HARLAN, IA 51593-1285
PO BOX 5786, HARLAN, IA 51593-1286
PO BOX 5787, HARLAN, IA 51593-1287
PO BOX 5788, HARLAN, IA 51593-1288
PO BOX 5789, HARLAN, IA 51593-1289
PO BOX 5790, HARLAN, IA 51593-1290
PO BOX 5791, HARLAN, IA 51593-1291
PO BOX 5792, HARLAN, IA 51593-1292
PO BOX 5793, HARLAN, IA 51593-1293
PO BOX 5794, HARLAN, IA 51593-1294
PO BOX 5795, HARLAN, IA 51593-1295
PO BOX 5796, HARLAN, IA 51593-1296
PO BOX 5797, HARLAN, IA 51593-1297
PO BOX 5798, HARLAN, IA 51593-1298
PO BOX 5799, HARLAN, IA 51593-1299
PO BOX 5800, HARLAN, IA 51593-1300
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