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 1321, MAYAGUEZ, PR 00681-1321
PO BOX 1322, MAYAGUEZ, PR 00681-1322
PO BOX 1323, MAYAGUEZ, PR 00681-1323
PO BOX 1324, MAYAGUEZ, PR 00681-1324
PO BOX 1325, MAYAGUEZ, PR 00681-1325
PO BOX 1326, MAYAGUEZ, PR 00681-1326
PO BOX 1327, MAYAGUEZ, PR 00681-1327
PO BOX 1328, MAYAGUEZ, PR 00681-1328
PO BOX 1329, MAYAGUEZ, PR 00681-1329
PO BOX 1330, MAYAGUEZ, PR 00681-1330
PO BOX 1331, MAYAGUEZ, PR 00681-1331
PO BOX 1332, MAYAGUEZ, PR 00681-1332
PO BOX 1333, MAYAGUEZ, PR 00681-1333
PO BOX 1334, MAYAGUEZ, PR 00681-1334
PO BOX 1335, MAYAGUEZ, PR 00681-1335
PO BOX 1336, MAYAGUEZ, PR 00681-1336
PO BOX 1337, MAYAGUEZ, PR 00681-1337
PO BOX 1338, MAYAGUEZ, PR 00681-1338
PO BOX 1339, MAYAGUEZ, PR 00681-1339
PO BOX 1340, MAYAGUEZ, PR 00681-1340
PO BOX 1341, MAYAGUEZ, PR 00681-1341
PO BOX 1342, MAYAGUEZ, PR 00681-1342
PO BOX 1343, MAYAGUEZ, PR 00681-1343
PO BOX 1344, MAYAGUEZ, PR 00681-1344
PO BOX 1345, MAYAGUEZ, PR 00681-1345
PO BOX 1346, MAYAGUEZ, PR 00681-1346
PO BOX 1347, MAYAGUEZ, PR 00681-1347
PO BOX 1348, MAYAGUEZ, PR 00681-1348
PO BOX 1349, MAYAGUEZ, PR 00681-1349
PO BOX 1350, MAYAGUEZ, PR 00681-1350
PO BOX 1351, MAYAGUEZ, PR 00681-1351
PO BOX 1352, MAYAGUEZ, PR 00681-1352
PO BOX 1353, MAYAGUEZ, PR 00681-1353
PO BOX 1354, MAYAGUEZ, PR 00681-1354
PO BOX 1355, MAYAGUEZ, PR 00681-1355
PO BOX 1356, MAYAGUEZ, PR 00681-1356
PO BOX 1357, MAYAGUEZ, PR 00681-1357
PO BOX 1358, MAYAGUEZ, PR 00681-1358
PO BOX 1359, MAYAGUEZ, PR 00681-1359
PO BOX 1360, MAYAGUEZ, PR 00681-1360
PO BOX 1361, MAYAGUEZ, PR 00681-1361
PO BOX 1362, MAYAGUEZ, PR 00681-1362
PO BOX 1363, MAYAGUEZ, PR 00681-1363
PO BOX 1364, MAYAGUEZ, PR 00681-1364
PO BOX 1365, MAYAGUEZ, PR 00681-1365
PO BOX 1366, MAYAGUEZ, PR 00681-1366
PO BOX 1367, MAYAGUEZ, PR 00681-1367
PO BOX 1368, MAYAGUEZ, PR 00681-1368
PO BOX 1369, MAYAGUEZ, PR 00681-1369
PO BOX 1370, MAYAGUEZ, PR 00681-1370
PO BOX 1371, MAYAGUEZ, PR 00681-1371
PO BOX 1372, MAYAGUEZ, PR 00681-1372
PO BOX 1373, MAYAGUEZ, PR 00681-1373
PO BOX 1374, MAYAGUEZ, PR 00681-1374
PO BOX 1375, MAYAGUEZ, PR 00681-1375
PO BOX 1376, MAYAGUEZ, PR 00681-1376
PO BOX 1377, MAYAGUEZ, PR 00681-1377
PO BOX 1378, MAYAGUEZ, PR 00681-1378
PO BOX 1379, MAYAGUEZ, PR 00681-1379
PO BOX 1380, MAYAGUEZ, PR 00681-1380
PO BOX 1381, MAYAGUEZ, PR 00681-1381
PO BOX 1382, MAYAGUEZ, PR 00681-1382
PO BOX 1383, MAYAGUEZ, PR 00681-1383
PO BOX 1384, MAYAGUEZ, PR 00681-1384
PO BOX 1385, MAYAGUEZ, PR 00681-1385
PO BOX 1386, MAYAGUEZ, PR 00681-1386
PO BOX 1387, MAYAGUEZ, PR 00681-1387
PO BOX 1388, MAYAGUEZ, PR 00681-1388
PO BOX 1389, MAYAGUEZ, PR 00681-1389
PO BOX 1390, MAYAGUEZ, PR 00681-1390
PO BOX 1391, MAYAGUEZ, PR 00681-1391
PO BOX 1392, MAYAGUEZ, PR 00681-1392
PO BOX 1393, MAYAGUEZ, PR 00681-1393
PO BOX 1394, MAYAGUEZ, PR 00681-1394
PO BOX 1395, MAYAGUEZ, PR 00681-1395
PO BOX 1396, MAYAGUEZ, PR 00681-1396
PO BOX 1397, MAYAGUEZ, PR 00681-1397
PO BOX 1398, MAYAGUEZ, PR 00681-1398
PO BOX 1399, MAYAGUEZ, PR 00681-1399
PO BOX 1400, MAYAGUEZ, PR 00681-1400
PO BOX 1401, MAYAGUEZ, PR 00681-1401
PO BOX 1402, MAYAGUEZ, PR 00681-1402
PO BOX 1403, MAYAGUEZ, PR 00681-1403
PO BOX 1404, MAYAGUEZ, PR 00681-1404
PO BOX 1405, MAYAGUEZ, PR 00681-1405
PO BOX 1406, MAYAGUEZ, PR 00681-1406
PO BOX 1407, MAYAGUEZ, PR 00681-1407
PO BOX 1408, MAYAGUEZ, PR 00681-1408
PO BOX 1409, MAYAGUEZ, PR 00681-1409
PO BOX 1410, MAYAGUEZ, PR 00681-1410
PO BOX 1411, MAYAGUEZ, PR 00681-1411
PO BOX 1412, MAYAGUEZ, PR 00681-1412
PO BOX 1413, MAYAGUEZ, PR 00681-1413
PO BOX 1414, MAYAGUEZ, PR 00681-1414
PO BOX 1415, MAYAGUEZ, PR 00681-1415
PO BOX 1416, MAYAGUEZ, PR 00681-1416
PO BOX 1417, MAYAGUEZ, PR 00681-1417
PO BOX 1418, MAYAGUEZ, PR 00681-1418
PO BOX 1419, MAYAGUEZ, PR 00681-1419
PO BOX 1420, MAYAGUEZ, PR 00681-1420
PO BOX 1421, MAYAGUEZ, PR 00681-1421
PO BOX 1422, MAYAGUEZ, PR 00681-1422
PO BOX 1423, MAYAGUEZ, PR 00681-1423
PO BOX 1424, MAYAGUEZ, PR 00681-1424
PO BOX 1425, MAYAGUEZ, PR 00681-1425
PO BOX 1426, MAYAGUEZ, PR 00681-1426
PO BOX 1427, MAYAGUEZ, PR 00681-1427
PO BOX 1428, MAYAGUEZ, PR 00681-1428
PO BOX 1429, MAYAGUEZ, PR 00681-1429
PO BOX 1430, MAYAGUEZ, PR 00681-1430
PO BOX 1431, MAYAGUEZ, PR 00681-1431
PO BOX 1432, MAYAGUEZ, PR 00681-1432
PO BOX 1433, MAYAGUEZ, PR 00681-1433
PO BOX 1434, MAYAGUEZ, PR 00681-1434
PO BOX 1435, MAYAGUEZ, PR 00681-1435
PO BOX 1436, MAYAGUEZ, PR 00681-1436
PO BOX 1437, MAYAGUEZ, PR 00681-1437
PO BOX 1438, MAYAGUEZ, PR 00681-1438
PO BOX 1439, MAYAGUEZ, PR 00681-1439
PO BOX 1440, MAYAGUEZ, PR 00681-1440
PO BOX 1441, MAYAGUEZ, PR 00681-1441
PO BOX 1442, MAYAGUEZ, PR 00681-1442
PO BOX 1443, MAYAGUEZ, PR 00681-1443
PO BOX 1444, MAYAGUEZ, PR 00681-1444
PO BOX 1445, MAYAGUEZ, PR 00681-1445
PO BOX 1446, MAYAGUEZ, PR 00681-1446
PO BOX 1447, MAYAGUEZ, PR 00681-1447
PO BOX 1448, MAYAGUEZ, PR 00681-1448
PO BOX 1449, MAYAGUEZ, PR 00681-1449
PO BOX 1450, MAYAGUEZ, PR 00681-1450
PO BOX 1451, MAYAGUEZ, PR 00681-1451
PO BOX 1452, MAYAGUEZ, PR 00681-1452
PO BOX 1453, MAYAGUEZ, PR 00681-1453
PO BOX 1454, MAYAGUEZ, PR 00681-1454
PO BOX 1455, MAYAGUEZ, PR 00681-1455
PO BOX 1456, MAYAGUEZ, PR 00681-1456
PO BOX 1457, MAYAGUEZ, PR 00681-1457
PO BOX 1458, MAYAGUEZ, PR 00681-1458
PO BOX 1459, MAYAGUEZ, PR 00681-1459
PO BOX 1460, MAYAGUEZ, PR 00681-1460
PO BOX 1461, MAYAGUEZ, PR 00681-1461
PO BOX 1462, MAYAGUEZ, PR 00681-1462
PO BOX 1463, MAYAGUEZ, PR 00681-1463
PO BOX 1464, MAYAGUEZ, PR 00681-1464
PO BOX 1465, MAYAGUEZ, PR 00681-1465
PO BOX 1466, MAYAGUEZ, PR 00681-1466
PO BOX 1467, MAYAGUEZ, PR 00681-1467
PO BOX 1468, MAYAGUEZ, PR 00681-1468
PO BOX 1469, MAYAGUEZ, PR 00681-1469
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