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 1251, ROCKFORD, IL 61105-1251
PO BOX 1252, ROCKFORD, IL 61105-1252
PO BOX 1253, ROCKFORD, IL 61105-1253
PO BOX 1254, ROCKFORD, IL 61105-1254
PO BOX 1255, ROCKFORD, IL 61105-1255
PO BOX 1256, ROCKFORD, IL 61105-1256
PO BOX 1257, ROCKFORD, IL 61105-1257
PO BOX 1258, ROCKFORD, IL 61105-1258
PO BOX 1259, ROCKFORD, IL 61105-1259
PO BOX 1260, ROCKFORD, IL 61105-1260
PO BOX 1261, ROCKFORD, IL 61105-1261
PO BOX 1262, ROCKFORD, IL 61105-1262
PO BOX 1263, ROCKFORD, IL 61105-1263
PO BOX 1264, ROCKFORD, IL 61105-1264
PO BOX 1265, ROCKFORD, IL 61105-1265
PO BOX 1266, ROCKFORD, IL 61105-1266
PO BOX 1267, ROCKFORD, IL 61105-1267
PO BOX 1268, ROCKFORD, IL 61105-1268
PO BOX 1269, ROCKFORD, IL 61105-1269
PO BOX 1270, ROCKFORD, IL 61105-1270
PO BOX 1271, ROCKFORD, IL 61105-1271
PO BOX 1272, ROCKFORD, IL 61105-1272
PO BOX 1273, ROCKFORD, IL 61105-1273
PO BOX 1274, ROCKFORD, IL 61105-1274
PO BOX 1275, ROCKFORD, IL 61105-1275
PO BOX 1276, ROCKFORD, IL 61105-1276
PO BOX 1277, ROCKFORD, IL 61105-1277
PO BOX 1278, ROCKFORD, IL 61105-1278
PO BOX 1279, ROCKFORD, IL 61105-1279
PO BOX 1280, ROCKFORD, IL 61105-1280
PO BOX 1281, ROCKFORD, IL 61105-1281
PO BOX 1282, ROCKFORD, IL 61105-1282
PO BOX 1283, ROCKFORD, IL 61105-1283
PO BOX 1284, ROCKFORD, IL 61105-1284
PO BOX 1285, ROCKFORD, IL 61105-1285
PO BOX 1286, ROCKFORD, IL 61105-1286
PO BOX 1287, ROCKFORD, IL 61105-1287
PO BOX 1288, ROCKFORD, IL 61105-1288
PO BOX 1289, ROCKFORD, IL 61105-1289
PO BOX 1290, ROCKFORD, IL 61105-1290
PO BOX 1291, ROCKFORD, IL 61105-1291
PO BOX 1292, ROCKFORD, IL 61105-1292
PO BOX 1293, ROCKFORD, IL 61105-1293
PO BOX 1294, ROCKFORD, IL 61105-1294
PO BOX 1295, ROCKFORD, IL 61105-1295
PO BOX 1296, ROCKFORD, IL 61105-1296
PO BOX 1297, ROCKFORD, IL 61105-1297
PO BOX 1298, ROCKFORD, IL 61105-1298
PO BOX 1299, ROCKFORD, IL 61105-1299
PO BOX 1300, ROCKFORD, IL 61105-1300
PO BOX 1301, ROCKFORD, IL 61105-1301
PO BOX 1302, ROCKFORD, IL 61105-1302
PO BOX 1303, ROCKFORD, IL 61105-1303
PO BOX 1304, ROCKFORD, IL 61105-1304
PO BOX 1305, ROCKFORD, IL 61105-1305
PO BOX 1306, ROCKFORD, IL 61105-1306
PO BOX 1307, ROCKFORD, IL 61105-1307
PO BOX 1308, ROCKFORD, IL 61105-1308
PO BOX 1309, ROCKFORD, IL 61105-1309
PO BOX 1310, ROCKFORD, IL 61105-1310
PO BOX 1311, ROCKFORD, IL 61105-1311
PO BOX 1312, ROCKFORD, IL 61105-1312
PO BOX 1313, ROCKFORD, IL 61105-1313
PO BOX 1314, ROCKFORD, IL 61105-1314
PO BOX 1315, ROCKFORD, IL 61105-1315
PO BOX 1316, ROCKFORD, IL 61105-1316
PO BOX 1317, ROCKFORD, IL 61105-1317
PO BOX 1318, ROCKFORD, IL 61105-1318
PO BOX 1319, ROCKFORD, IL 61105-1319
PO BOX 1320, ROCKFORD, IL 61105-1320
PO BOX 1321, ROCKFORD, IL 61105-1321
PO BOX 1322, ROCKFORD, IL 61105-1322
PO BOX 1323, ROCKFORD, IL 61105-1323
PO BOX 1324, ROCKFORD, IL 61105-1324
PO BOX 1325, ROCKFORD, IL 61105-1325
PO BOX 1326, ROCKFORD, IL 61105-1326
PO BOX 1327, ROCKFORD, IL 61105-1327
PO BOX 1328, ROCKFORD, IL 61105-1328
PO BOX 1329, ROCKFORD, IL 61105-1329
PO BOX 1330, ROCKFORD, IL 61105-1330
PO BOX 1331, ROCKFORD, IL 61105-1331
PO BOX 1332, ROCKFORD, IL 61105-1332
PO BOX 1333, ROCKFORD, IL 61105-1333
PO BOX 1334, ROCKFORD, IL 61105-1334
PO BOX 1335, ROCKFORD, IL 61105-1335
PO BOX 1336, ROCKFORD, IL 61105-1336
PO BOX 1337, ROCKFORD, IL 61105-1337
PO BOX 1338, ROCKFORD, IL 61105-1338
PO BOX 1339, ROCKFORD, IL 61105-1339
PO BOX 1340, ROCKFORD, IL 61105-1340
PO BOX 1341, ROCKFORD, IL 61105-1341
PO BOX 1342, ROCKFORD, IL 61105-1342
PO BOX 1343, ROCKFORD, IL 61105-1343
PO BOX 1344, ROCKFORD, IL 61105-1344
PO BOX 1345, ROCKFORD, IL 61105-1345
PO BOX 1346, ROCKFORD, IL 61105-1346
PO BOX 1347, ROCKFORD, IL 61105-1347
PO BOX 1348, ROCKFORD, IL 61105-1348
PO BOX 1349, ROCKFORD, IL 61105-1349
PO BOX 1350, ROCKFORD, IL 61105-1350
PO BOX 1351, ROCKFORD, IL 61105-1351
PO BOX 1352, ROCKFORD, IL 61105-1352
PO BOX 1353, ROCKFORD, IL 61105-1353
PO BOX 1354, ROCKFORD, IL 61105-1354
PO BOX 1355, ROCKFORD, IL 61105-1355
PO BOX 1356, ROCKFORD, IL 61105-1356
PO BOX 1357, ROCKFORD, IL 61105-1357
PO BOX 1358, ROCKFORD, IL 61105-1358
PO BOX 1359, ROCKFORD, IL 61105-1359
PO BOX 1360, ROCKFORD, IL 61105-1360
PO BOX 1361, ROCKFORD, IL 61105-1361
PO BOX 1362, ROCKFORD, IL 61105-1362
PO BOX 1363, ROCKFORD, IL 61105-1363
PO BOX 1364, ROCKFORD, IL 61105-1364
PO BOX 1365, ROCKFORD, IL 61105-1365
PO BOX 1366, ROCKFORD, IL 61105-1366
PO BOX 1367, ROCKFORD, IL 61105-1367
PO BOX 1368, ROCKFORD, IL 61105-1368
PO BOX 1369, ROCKFORD, IL 61105-1369
PO BOX 1370, ROCKFORD, IL 61105-1370
PO BOX 1371, ROCKFORD, IL 61105-1371
PO BOX 1372, ROCKFORD, IL 61105-1372
PO BOX 1373, ROCKFORD, IL 61105-1373
PO BOX 1374, ROCKFORD, IL 61105-1374
PO BOX 1375, ROCKFORD, IL 61105-1375
PO BOX 1376, ROCKFORD, IL 61105-1376
PO BOX 1377, ROCKFORD, IL 61105-1377
PO BOX 1378, ROCKFORD, IL 61105-1378
PO BOX 1379, ROCKFORD, IL 61105-1379
PO BOX 1380, ROCKFORD, IL 61105-1380
PO BOX 1381, ROCKFORD, IL 61105-1381
PO BOX 1382, ROCKFORD, IL 61105-1382
PO BOX 1383, ROCKFORD, IL 61105-1383
PO BOX 1384, ROCKFORD, IL 61105-1384
PO BOX 1385, ROCKFORD, IL 61105-1385
PO BOX 1386, ROCKFORD, IL 61105-1386
PO BOX 1387, ROCKFORD, IL 61105-1387
PO BOX 1388, ROCKFORD, IL 61105-1388
PO BOX 1389, ROCKFORD, IL 61105-1389
PO BOX 1390, ROCKFORD, IL 61105-1390
PO BOX 1391, ROCKFORD, IL 61105-1391
PO BOX 1392, ROCKFORD, IL 61105-1392
PO BOX 1393, ROCKFORD, IL 61105-1393
PO BOX 1394, ROCKFORD, IL 61105-1394
PO BOX 1395, ROCKFORD, IL 61105-1395
PO BOX 1396, ROCKFORD, IL 61105-1396
PO BOX 1397, ROCKFORD, IL 61105-1397
PO BOX 1398, ROCKFORD, IL 61105-1398
PO BOX 1399, ROCKFORD, IL 61105-1399
PO BOX 1400, ROCKFORD, IL 61105-1400
PO BOX 1401, ROCKFORD, IL 61105-1401
PO BOX 1402, ROCKFORD, IL 61105-1402
PO BOX 1403, ROCKFORD, IL 61105-1403
PO BOX 1404, ROCKFORD, IL 61105-1404
PO BOX 1405, ROCKFORD, IL 61105-1405
PO BOX 1406, ROCKFORD, IL 61105-1406
PO BOX 1407, ROCKFORD, IL 61105-1407
PO BOX 1408, ROCKFORD, IL 61105-1408
PO BOX 1409, ROCKFORD, IL 61105-1409
PO BOX 1410, ROCKFORD, IL 61105-1410
PO BOX 1411, ROCKFORD, IL 61105-1411
PO BOX 1412, ROCKFORD, IL 61105-1412
PO BOX 1413, ROCKFORD, IL 61105-1413
PO BOX 1414, ROCKFORD, IL 61105-1414
PO BOX 1415, ROCKFORD, IL 61105-1415
PO BOX 1416, ROCKFORD, IL 61105-1416
PO BOX 1417, ROCKFORD, IL 61105-1417
PO BOX 1418, ROCKFORD, IL 61105-1418
PO BOX 1419, ROCKFORD, IL 61105-1419
PO BOX 1420, ROCKFORD, IL 61105-1420
PO BOX 1421, ROCKFORD, IL 61105-1421
PO BOX 1422, ROCKFORD, IL 61105-1422
PO BOX 1423, ROCKFORD, IL 61105-1423
PO BOX 1424, ROCKFORD, IL 61105-1424
PO BOX 1425, ROCKFORD, IL 61105-1425
PO BOX 1426, ROCKFORD, IL 61105-1426
PO BOX 1427, ROCKFORD, IL 61105-1427
PO BOX 1428, ROCKFORD, IL 61105-1428
PO BOX 1429, ROCKFORD, IL 61105-1429
PO BOX 1430, ROCKFORD, IL 61105-1430
PO BOX 1431, ROCKFORD, IL 61105-1431
PO BOX 1432, ROCKFORD, IL 61105-1432
PO BOX 1433, ROCKFORD, IL 61105-1433
PO BOX 1434, ROCKFORD, IL 61105-1434
PO BOX 1435, ROCKFORD, IL 61105-1435
PO BOX 1436, ROCKFORD, IL 61105-1436
PO BOX 1437, ROCKFORD, IL 61105-1437
PO BOX 1438, ROCKFORD, IL 61105-1438
PO BOX 1439, ROCKFORD, IL 61105-1439
PO BOX 1440, ROCKFORD, IL 61105-1440
PO BOX 1441, ROCKFORD, IL 61105-1441
PO BOX 1442, ROCKFORD, IL 61105-1442
PO BOX 1443, ROCKFORD, IL 61105-1443
PO BOX 1444, ROCKFORD, IL 61105-1444
PO BOX 1445, ROCKFORD, IL 61105-1445
PO BOX 1446, ROCKFORD, IL 61105-1446
PO BOX 1447, ROCKFORD, IL 61105-1447
PO BOX 1448, ROCKFORD, IL 61105-1448
PO BOX 1449, ROCKFORD, IL 61105-1449
PO BOX 1450, ROCKFORD, IL 61105-1450
PO BOX 1451, ROCKFORD, IL 61105-1451
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