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 1441, PORTERVILLE, CA 93258-1441
PO BOX 1442, PORTERVILLE, CA 93258-1442
PO BOX 1443, PORTERVILLE, CA 93258-1443
PO BOX 1444, PORTERVILLE, CA 93258-1444
PO BOX 1445, PORTERVILLE, CA 93258-1445
PO BOX 1446, PORTERVILLE, CA 93258-1446
PO BOX 1447, PORTERVILLE, CA 93258-1447
PO BOX 1448, PORTERVILLE, CA 93258-1448
PO BOX 1449, PORTERVILLE, CA 93258-1449
PO BOX 1450, PORTERVILLE, CA 93258-1450
PO BOX 1451, PORTERVILLE, CA 93258-1451
PO BOX 1452, PORTERVILLE, CA 93258-1452
PO BOX 1453, PORTERVILLE, CA 93258-1453
PO BOX 1454, PORTERVILLE, CA 93258-1454
PO BOX 1455, PORTERVILLE, CA 93258-1455
PO BOX 1456, PORTERVILLE, CA 93258-1456
PO BOX 1457, PORTERVILLE, CA 93258-1457
PO BOX 1458, PORTERVILLE, CA 93258-1458
PO BOX 1459, PORTERVILLE, CA 93258-1459
PO BOX 1460, PORTERVILLE, CA 93258-1460
PO BOX 1461, PORTERVILLE, CA 93258-1461
PO BOX 1462, PORTERVILLE, CA 93258-1462
PO BOX 1463, PORTERVILLE, CA 93258-1463
PO BOX 1464, PORTERVILLE, CA 93258-1464
PO BOX 1465, PORTERVILLE, CA 93258-1465
PO BOX 1466, PORTERVILLE, CA 93258-1466
PO BOX 1467, PORTERVILLE, CA 93258-1467
PO BOX 1468, PORTERVILLE, CA 93258-1468
PO BOX 1469, PORTERVILLE, CA 93258-1469
PO BOX 1470, PORTERVILLE, CA 93258-1470
PO BOX 1471, PORTERVILLE, CA 93258-1471
PO BOX 1472, PORTERVILLE, CA 93258-1472
PO BOX 1473, PORTERVILLE, CA 93258-1473
PO BOX 1474, PORTERVILLE, CA 93258-1474
PO BOX 1475, PORTERVILLE, CA 93258-1475
PO BOX 1476, PORTERVILLE, CA 93258-1476
PO BOX 1477, PORTERVILLE, CA 93258-1477
PO BOX 1478, PORTERVILLE, CA 93258-1478
PO BOX 1479, PORTERVILLE, CA 93258-1479
PO BOX 1480, PORTERVILLE, CA 93258-1480
PO BOX 1481, PORTERVILLE, CA 93258-1481
PO BOX 1482, PORTERVILLE, CA 93258-1482
PO BOX 1483, PORTERVILLE, CA 93258-1483
PO BOX 1484, PORTERVILLE, CA 93258-1484
PO BOX 1485, PORTERVILLE, CA 93258-1485
PO BOX 1486, PORTERVILLE, CA 93258-1486
PO BOX 1487, PORTERVILLE, CA 93258-1487
PO BOX 1488, PORTERVILLE, CA 93258-1488
PO BOX 1489, PORTERVILLE, CA 93258-1489
PO BOX 1490, PORTERVILLE, CA 93258-1490
PO BOX 1491, PORTERVILLE, CA 93258-1491
PO BOX 1492, PORTERVILLE, CA 93258-1492
PO BOX 1493, PORTERVILLE, CA 93258-1493
PO BOX 1494, PORTERVILLE, CA 93258-1494
PO BOX 1495, PORTERVILLE, CA 93258-1495
PO BOX 1496, PORTERVILLE, CA 93258-1496
PO BOX 1497, PORTERVILLE, CA 93258-1497
PO BOX 1498, PORTERVILLE, CA 93258-1498
PO BOX 1499, PORTERVILLE, CA 93258-1499
PO BOX 1500, PORTERVILLE, CA 93258-1500
PO BOX 1501, PORTERVILLE, CA 93258-1501
PO BOX 1502, PORTERVILLE, CA 93258-1502
PO BOX 1503, PORTERVILLE, CA 93258-1503
PO BOX 1504, PORTERVILLE, CA 93258-1504
PO BOX 1505, PORTERVILLE, CA 93258-1505
PO BOX 1506, PORTERVILLE, CA 93258-1506
PO BOX 1507, PORTERVILLE, CA 93258-1507
PO BOX 1508, PORTERVILLE, CA 93258-1508
PO BOX 1509, PORTERVILLE, CA 93258-1509
PO BOX 1510, PORTERVILLE, CA 93258-1510
PO BOX 1511, PORTERVILLE, CA 93258-1511
PO BOX 1512, PORTERVILLE, CA 93258-1512
PO BOX 1513, PORTERVILLE, CA 93258-1513
PO BOX 1514, PORTERVILLE, CA 93258-1514
PO BOX 1515, PORTERVILLE, CA 93258-1515
PO BOX 1516, PORTERVILLE, CA 93258-1516
PO BOX 1517, PORTERVILLE, CA 93258-1517
PO BOX 1518, PORTERVILLE, CA 93258-1518
PO BOX 1519, PORTERVILLE, CA 93258-1519
PO BOX 1520, PORTERVILLE, CA 93258-1520
PO BOX 1521, PORTERVILLE, CA 93258-1521
PO BOX 1522, PORTERVILLE, CA 93258-1522
PO BOX 1523, PORTERVILLE, CA 93258-1523
PO BOX 1524, PORTERVILLE, CA 93258-1524
PO BOX 1525, PORTERVILLE, CA 93258-1525
PO BOX 1526, PORTERVILLE, CA 93258-1526
PO BOX 1527, PORTERVILLE, CA 93258-1527
PO BOX 1528, PORTERVILLE, CA 93258-1528
PO BOX 1529, PORTERVILLE, CA 93258-1529
PO BOX 1530, PORTERVILLE, CA 93258-1530
PO BOX 1531, PORTERVILLE, CA 93258-1531
PO BOX 1532, PORTERVILLE, CA 93258-1532
PO BOX 1533, PORTERVILLE, CA 93258-1533
PO BOX 1534, PORTERVILLE, CA 93258-1534
PO BOX 1535, PORTERVILLE, CA 93258-1535
PO BOX 1536, PORTERVILLE, CA 93258-1536
PO BOX 1537, PORTERVILLE, CA 93258-1537
PO BOX 1538, PORTERVILLE, CA 93258-1538
PO BOX 1539, PORTERVILLE, CA 93258-1539
PO BOX 1540, PORTERVILLE, CA 93258-1540
PO BOX 1541, PORTERVILLE, CA 93258-1541
PO BOX 1542, PORTERVILLE, CA 93258-1542
PO BOX 1543, PORTERVILLE, CA 93258-1543
PO BOX 1544, PORTERVILLE, CA 93258-1544
PO BOX 1545, PORTERVILLE, CA 93258-1545
PO BOX 1546, PORTERVILLE, CA 93258-1546
PO BOX 1547, PORTERVILLE, CA 93258-1547
PO BOX 1548, PORTERVILLE, CA 93258-1548
PO BOX 1549, PORTERVILLE, CA 93258-1549
PO BOX 1550, PORTERVILLE, CA 93258-1550
PO BOX 1551, PORTERVILLE, CA 93258-1551
PO BOX 1552, PORTERVILLE, CA 93258-1552
PO BOX 1553, PORTERVILLE, CA 93258-1553
PO BOX 1554, PORTERVILLE, CA 93258-1554
PO BOX 1555, PORTERVILLE, CA 93258-1555
PO BOX 1556, PORTERVILLE, CA 93258-1556
PO BOX 1557, PORTERVILLE, CA 93258-1557
PO BOX 1558, PORTERVILLE, CA 93258-1558
PO BOX 1559, PORTERVILLE, CA 93258-1559
PO BOX 1560, PORTERVILLE, CA 93258-1560
PO BOX 1561, PORTERVILLE, CA 93258-1561
PO BOX 1562, PORTERVILLE, CA 93258-1562
PO BOX 1563, PORTERVILLE, CA 93258-1563
PO BOX 1564, PORTERVILLE, CA 93258-1564
PO BOX 1565, PORTERVILLE, CA 93258-1565
PO BOX 1566, PORTERVILLE, CA 93258-1566
PO BOX 1567, PORTERVILLE, CA 93258-1567
PO BOX 1568, PORTERVILLE, CA 93258-1568
PO BOX 1569, PORTERVILLE, CA 93258-1569
PO BOX 1570, PORTERVILLE, CA 93258-1570
PO BOX 1571, PORTERVILLE, CA 93258-1571
PO BOX 1572, PORTERVILLE, CA 93258-1572
PO BOX 1573, PORTERVILLE, CA 93258-1573
PO BOX 1574, PORTERVILLE, CA 93258-1574
PO BOX 1575, PORTERVILLE, CA 93258-1575
PO BOX 1576, PORTERVILLE, CA 93258-1576
PO BOX 1577, PORTERVILLE, CA 93258-1577
PO BOX 1578, PORTERVILLE, CA 93258-1578
PO BOX 1579, PORTERVILLE, CA 93258-1579
PO BOX 1580, PORTERVILLE, CA 93258-1580
PO BOX 1581, PORTERVILLE, CA 93258-1581
PO BOX 1582, PORTERVILLE, CA 93258-1582
PO BOX 1583, PORTERVILLE, CA 93258-1583
PO BOX 1584, PORTERVILLE, CA 93258-1584
PO BOX 1585, PORTERVILLE, CA 93258-1585
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