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 1301, IOWA CITY, IA 52244-1301
PO BOX 1302, IOWA CITY, IA 52244-1302
PO BOX 1303, IOWA CITY, IA 52244-1303
PO BOX 1304, IOWA CITY, IA 52244-1304
PO BOX 1305, IOWA CITY, IA 52244-1305
PO BOX 1306, IOWA CITY, IA 52244-1306
PO BOX 1307, IOWA CITY, IA 52244-1307
PO BOX 1308, IOWA CITY, IA 52244-1308
PO BOX 1309, IOWA CITY, IA 52244-1309
PO BOX 1310, IOWA CITY, IA 52244-1310
PO BOX 1311, IOWA CITY, IA 52244-1311
PO BOX 1312, IOWA CITY, IA 52244-1312
PO BOX 1313, IOWA CITY, IA 52244-1313
PO BOX 1314, IOWA CITY, IA 52244-1314
PO BOX 1315, IOWA CITY, IA 52244-1315
PO BOX 1316, IOWA CITY, IA 52244-1316
PO BOX 1317, IOWA CITY, IA 52244-1317
PO BOX 1318, IOWA CITY, IA 52244-1318
PO BOX 1319, IOWA CITY, IA 52244-1319
PO BOX 1320, IOWA CITY, IA 52244-1320
PO BOX 1321, IOWA CITY, IA 52244-1321
PO BOX 1322, IOWA CITY, IA 52244-1322
PO BOX 1323, IOWA CITY, IA 52244-1323
PO BOX 1324, IOWA CITY, IA 52244-1324
PO BOX 1325, IOWA CITY, IA 52244-1325
PO BOX 1326, IOWA CITY, IA 52244-1326
PO BOX 1327, IOWA CITY, IA 52244-1327
PO BOX 1328, IOWA CITY, IA 52244-1328
PO BOX 1329, IOWA CITY, IA 52244-1329
PO BOX 1330, IOWA CITY, IA 52244-1330
PO BOX 1331, IOWA CITY, IA 52244-1331
PO BOX 1332, IOWA CITY, IA 52244-1332
PO BOX 1333, IOWA CITY, IA 52244-1333
PO BOX 1334, IOWA CITY, IA 52244-1334
PO BOX 1335, IOWA CITY, IA 52244-1335
PO BOX 1336, IOWA CITY, IA 52244-1336
PO BOX 1337, IOWA CITY, IA 52244-1337
PO BOX 1338, IOWA CITY, IA 52244-1338
PO BOX 1339, IOWA CITY, IA 52244-1339
PO BOX 1340, IOWA CITY, IA 52244-1340
PO BOX 1341, IOWA CITY, IA 52244-1341
PO BOX 1342, IOWA CITY, IA 52244-1342
PO BOX 1343, IOWA CITY, IA 52244-1343
PO BOX 1344, IOWA CITY, IA 52244-1344
PO BOX 1345, IOWA CITY, IA 52244-1345
PO BOX 1346, IOWA CITY, IA 52244-1346
PO BOX 1347, IOWA CITY, IA 52244-1347
PO BOX 1348, IOWA CITY, IA 52244-1348
PO BOX 1349, IOWA CITY, IA 52244-1349
PO BOX 1350, IOWA CITY, IA 52244-1350
PO BOX 1351, IOWA CITY, IA 52244-1351
PO BOX 1352, IOWA CITY, IA 52244-1352
PO BOX 1353, IOWA CITY, IA 52244-1353
PO BOX 1354, IOWA CITY, IA 52244-1354
PO BOX 1355, IOWA CITY, IA 52244-1355
PO BOX 1356, IOWA CITY, IA 52244-1356
PO BOX 1357, IOWA CITY, IA 52244-1357
PO BOX 1358, IOWA CITY, IA 52244-1358
PO BOX 1359, IOWA CITY, IA 52244-1359
PO BOX 1360, IOWA CITY, IA 52244-1360
PO BOX 1361, IOWA CITY, IA 52244-1361
PO BOX 1362, IOWA CITY, IA 52244-1362
PO BOX 1363, IOWA CITY, IA 52244-1363
PO BOX 1364, IOWA CITY, IA 52244-1364
PO BOX 1365, IOWA CITY, IA 52244-1365
PO BOX 1366, IOWA CITY, IA 52244-1366
PO BOX 1367, IOWA CITY, IA 52244-1367
PO BOX 1368, IOWA CITY, IA 52244-1368
PO BOX 1369, IOWA CITY, IA 52244-1369
PO BOX 1370, IOWA CITY, IA 52244-1370
PO BOX 1371, IOWA CITY, IA 52244-1371
PO BOX 1372, IOWA CITY, IA 52244-1372
PO BOX 1373, IOWA CITY, IA 52244-1373
PO BOX 1374, IOWA CITY, IA 52244-1374
PO BOX 1375, IOWA CITY, IA 52244-1375
PO BOX 1376, IOWA CITY, IA 52244-1376
PO BOX 1377, IOWA CITY, IA 52244-1377
PO BOX 1378, IOWA CITY, IA 52244-1378
PO BOX 1379, IOWA CITY, IA 52244-1379
PO BOX 1380, IOWA CITY, IA 52244-1380
PO BOX 1381, IOWA CITY, IA 52244-1381
PO BOX 1382, IOWA CITY, IA 52244-1382
PO BOX 1383, IOWA CITY, IA 52244-1383
PO BOX 1384, IOWA CITY, IA 52244-1384
PO BOX 1385, IOWA CITY, IA 52244-1385
PO BOX 1386, IOWA CITY, IA 52244-1386
PO BOX 1387, IOWA CITY, IA 52244-1387
PO BOX 1388, IOWA CITY, IA 52244-1388
PO BOX 1389, IOWA CITY, IA 52244-1389
PO BOX 1390, IOWA CITY, IA 52244-1390
PO BOX 1391, IOWA CITY, IA 52244-1391
PO BOX 1392, IOWA CITY, IA 52244-1392
PO BOX 1393, IOWA CITY, IA 52244-1393
PO BOX 1394, IOWA CITY, IA 52244-1394
PO BOX 1395, IOWA CITY, IA 52244-1395
PO BOX 1396, IOWA CITY, IA 52244-1396
PO BOX 1397, IOWA CITY, IA 52244-1397
PO BOX 1398, IOWA CITY, IA 52244-1398
PO BOX 1399, IOWA CITY, IA 52244-1399
PO BOX 1400, IOWA CITY, IA 52244-1400
PO BOX 1401, IOWA CITY, IA 52244-1401
PO BOX 1402, IOWA CITY, IA 52244-1402
PO BOX 1403, IOWA CITY, IA 52244-1403
PO BOX 1404, IOWA CITY, IA 52244-1404
PO BOX 1405, IOWA CITY, IA 52244-1405
PO BOX 1406, IOWA CITY, IA 52244-1406
PO BOX 1407, IOWA CITY, IA 52244-1407
PO BOX 1408, IOWA CITY, IA 52244-1408
PO BOX 1409, IOWA CITY, IA 52244-1409
PO BOX 1410, IOWA CITY, IA 52244-1410
PO BOX 1411, IOWA CITY, IA 52244-1411
PO BOX 1412, IOWA CITY, IA 52244-1412
PO BOX 1413, IOWA CITY, IA 52244-1413
PO BOX 1414, IOWA CITY, IA 52244-1414
PO BOX 1415, IOWA CITY, IA 52244-1415
PO BOX 1416, IOWA CITY, IA 52244-1416
PO BOX 1417, IOWA CITY, IA 52244-1417
PO BOX 1418, IOWA CITY, IA 52244-1418
PO BOX 1419, IOWA CITY, IA 52244-1419
PO BOX 1420, IOWA CITY, IA 52244-1420
PO BOX 1421, IOWA CITY, IA 52244-1421
PO BOX 1422, IOWA CITY, IA 52244-1422
PO BOX 1423, IOWA CITY, IA 52244-1423
PO BOX 1424, IOWA CITY, IA 52244-1424
PO BOX 1425, IOWA CITY, IA 52244-1425
PO BOX 1426, IOWA CITY, IA 52244-1426
PO BOX 1427, IOWA CITY, IA 52244-1427
PO BOX 1428, IOWA CITY, IA 52244-1428
PO BOX 1429, IOWA CITY, IA 52244-1429
PO BOX 1430, IOWA CITY, IA 52244-1430
PO BOX 1431, IOWA CITY, IA 52244-1431
PO BOX 1432, IOWA CITY, IA 52244-1432
PO BOX 1433, IOWA CITY, IA 52244-1433
PO BOX 1434, IOWA CITY, IA 52244-1434
PO BOX 1435, IOWA CITY, IA 52244-1435
PO BOX 1436, IOWA CITY, IA 52244-1436
PO BOX 1437, IOWA CITY, IA 52244-1437
PO BOX 1438, IOWA CITY, IA 52244-1438
PO BOX 1439, IOWA CITY, IA 52244-1439
PO BOX 1440, IOWA CITY, IA 52244-1440
PO BOX 1441, IOWA CITY, IA 52244-1441
PO BOX 1442, IOWA CITY, IA 52244-1442
PO BOX 1443, IOWA CITY, IA 52244-1443
PO BOX 1444, IOWA CITY, IA 52244-1444
PO BOX 1445, IOWA CITY, IA 52244-1445
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