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 1481, SPRING VALLEY, CA 91979-1481
PO BOX 1482, SPRING VALLEY, CA 91979-1482
PO BOX 1483, SPRING VALLEY, CA 91979-1483
PO BOX 1484, SPRING VALLEY, CA 91979-1484
PO BOX 1485, SPRING VALLEY, CA 91979-1485
PO BOX 1486, SPRING VALLEY, CA 91979-1486
PO BOX 1487, SPRING VALLEY, CA 91979-1487
PO BOX 1488, SPRING VALLEY, CA 91979-1488
PO BOX 1489, SPRING VALLEY, CA 91979-1489
PO BOX 1490, SPRING VALLEY, CA 91979-1490
PO BOX 1491, SPRING VALLEY, CA 91979-1491
PO BOX 1492, SPRING VALLEY, CA 91979-1492
PO BOX 1493, SPRING VALLEY, CA 91979-1493
PO BOX 1494, SPRING VALLEY, CA 91979-1494
PO BOX 1495, SPRING VALLEY, CA 91979-1495
PO BOX 1496, SPRING VALLEY, CA 91979-1496
PO BOX 1497, SPRING VALLEY, CA 91979-1497
PO BOX 1498, SPRING VALLEY, CA 91979-1498
PO BOX 1499, SPRING VALLEY, CA 91979-1499
PO BOX 1500, SPRING VALLEY, CA 91979-1500
PO BOX 1501, SPRING VALLEY, CA 91979-1501
PO BOX 1502, SPRING VALLEY, CA 91979-1502
PO BOX 1503, SPRING VALLEY, CA 91979-1503
PO BOX 1504, SPRING VALLEY, CA 91979-1504
PO BOX 1505, SPRING VALLEY, CA 91979-1505
PO BOX 1506, SPRING VALLEY, CA 91979-1506
PO BOX 1507, SPRING VALLEY, CA 91979-1507
PO BOX 1508, SPRING VALLEY, CA 91979-1508
PO BOX 1509, SPRING VALLEY, CA 91979-1509
PO BOX 1510, SPRING VALLEY, CA 91979-1510
PO BOX 1511, SPRING VALLEY, CA 91979-1511
PO BOX 1512, SPRING VALLEY, CA 91979-1512
PO BOX 1513, SPRING VALLEY, CA 91979-1513
PO BOX 1514, SPRING VALLEY, CA 91979-1514
PO BOX 1515, SPRING VALLEY, CA 91979-1515
PO BOX 1516, SPRING VALLEY, CA 91979-1516
PO BOX 1517, SPRING VALLEY, CA 91979-1517
PO BOX 1518, SPRING VALLEY, CA 91979-1518
PO BOX 1519, SPRING VALLEY, CA 91979-1519
PO BOX 1520, SPRING VALLEY, CA 91979-1520
PO BOX 1521, SPRING VALLEY, CA 91979-1521
PO BOX 1522, SPRING VALLEY, CA 91979-1522
PO BOX 1523, SPRING VALLEY, CA 91979-1523
PO BOX 1524, SPRING VALLEY, CA 91979-1524
PO BOX 1525, SPRING VALLEY, CA 91979-1525
PO BOX 1526, SPRING VALLEY, CA 91979-1526
PO BOX 1527, SPRING VALLEY, CA 91979-1527
PO BOX 1528, SPRING VALLEY, CA 91979-1528
PO BOX 1529, SPRING VALLEY, CA 91979-1529
PO BOX 1530, SPRING VALLEY, CA 91979-1530
PO BOX 1531, SPRING VALLEY, CA 91979-1531
PO BOX 1532, SPRING VALLEY, CA 91979-1532
PO BOX 1533, SPRING VALLEY, CA 91979-1533
PO BOX 1534, SPRING VALLEY, CA 91979-1534
PO BOX 1535, SPRING VALLEY, CA 91979-1535
PO BOX 1536, SPRING VALLEY, CA 91979-1536
PO BOX 1537, SPRING VALLEY, CA 91979-1537
PO BOX 1538, SPRING VALLEY, CA 91979-1538
PO BOX 1539, SPRING VALLEY, CA 91979-1539
PO BOX 1540, SPRING VALLEY, CA 91979-1540
PO BOX 1541, SPRING VALLEY, CA 91979-1541
PO BOX 1542, SPRING VALLEY, CA 91979-1542
PO BOX 1543, SPRING VALLEY, CA 91979-1543
PO BOX 1544, SPRING VALLEY, CA 91979-1544
PO BOX 1545, SPRING VALLEY, CA 91979-1545
PO BOX 1546, SPRING VALLEY, CA 91979-1546
PO BOX 1547, SPRING VALLEY, CA 91979-1547
PO BOX 1548, SPRING VALLEY, CA 91979-1548
PO BOX 1549, SPRING VALLEY, CA 91979-1549
PO BOX 1550, SPRING VALLEY, CA 91979-1550
PO BOX 1551, SPRING VALLEY, CA 91979-1551
PO BOX 1552, SPRING VALLEY, CA 91979-1552
PO BOX 1553, SPRING VALLEY, CA 91979-1553
PO BOX 1554, SPRING VALLEY, CA 91979-1554
PO BOX 1555, SPRING VALLEY, CA 91979-1555
PO BOX 1556, SPRING VALLEY, CA 91979-1556
PO BOX 1557, SPRING VALLEY, CA 91979-1557
PO BOX 1558, SPRING VALLEY, CA 91979-1558
PO BOX 1559, SPRING VALLEY, CA 91979-1559
PO BOX 1560, SPRING VALLEY, CA 91979-1560
PO BOX 1561, SPRING VALLEY, CA 91979-1561
PO BOX 1562, SPRING VALLEY, CA 91979-1562
PO BOX 1563, SPRING VALLEY, CA 91979-1563
PO BOX 1564, SPRING VALLEY, CA 91979-1564
PO BOX 1565, SPRING VALLEY, CA 91979-1565
PO BOX 1566, SPRING VALLEY, CA 91979-1566
PO BOX 1567, SPRING VALLEY, CA 91979-1567
PO BOX 1568, SPRING VALLEY, CA 91979-1568
PO BOX 1569, SPRING VALLEY, CA 91979-1569
PO BOX 1570, SPRING VALLEY, CA 91979-1570
PO BOX 1571, SPRING VALLEY, CA 91979-1571
PO BOX 1572, SPRING VALLEY, CA 91979-1572
PO BOX 1573, SPRING VALLEY, CA 91979-1573
PO BOX 1574, SPRING VALLEY, CA 91979-1574
PO BOX 1575, SPRING VALLEY, CA 91979-1575
PO BOX 1576, SPRING VALLEY, CA 91979-1576
PO BOX 1577, SPRING VALLEY, CA 91979-1577
PO BOX 1578, SPRING VALLEY, CA 91979-1578
PO BOX 1579, SPRING VALLEY, CA 91979-1579
PO BOX 1580, SPRING VALLEY, CA 91979-1580
PO BOX 1581, SPRING VALLEY, CA 91979-1581
PO BOX 1582, SPRING VALLEY, CA 91979-1582
PO BOX 1583, SPRING VALLEY, CA 91979-1583
PO BOX 1584, SPRING VALLEY, CA 91979-1584
PO BOX 1585, SPRING VALLEY, CA 91979-1585
PO BOX 1586, SPRING VALLEY, CA 91979-1586
PO BOX 1587, SPRING VALLEY, CA 91979-1587
PO BOX 1588, SPRING VALLEY, CA 91979-1588
PO BOX 1589, SPRING VALLEY, CA 91979-1589
PO BOX 1590, SPRING VALLEY, CA 91979-1590
PO BOX 1591, SPRING VALLEY, CA 91979-1591
PO BOX 1592, SPRING VALLEY, CA 91979-1592
PO BOX 1593, SPRING VALLEY, CA 91979-1593
PO BOX 1594, SPRING VALLEY, CA 91979-1594
PO BOX 1595, SPRING VALLEY, CA 91979-1595
PO BOX 1596, SPRING VALLEY, CA 91979-1596
PO BOX 1597, SPRING VALLEY, CA 91979-1597
PO BOX 1598, SPRING VALLEY, CA 91979-1598
PO BOX 1599, SPRING VALLEY, CA 91979-1599
PO BOX 1600, SPRING VALLEY, CA 91979-1600
PO BOX 1601, SPRING VALLEY, CA 91979-1601
PO BOX 1602, SPRING VALLEY, CA 91979-1602
PO BOX 1603, SPRING VALLEY, CA 91979-1603
PO BOX 1604, SPRING VALLEY, CA 91979-1604
PO BOX 1605, SPRING VALLEY, CA 91979-1605
PO BOX 1606, SPRING VALLEY, CA 91979-1606
PO BOX 1607, SPRING VALLEY, CA 91979-1607
PO BOX 1608, SPRING VALLEY, CA 91979-1608
PO BOX 1609, SPRING VALLEY, CA 91979-1609
PO BOX 1610, SPRING VALLEY, CA 91979-1610
PO BOX 1611, SPRING VALLEY, CA 91979-1611
PO BOX 1612, SPRING VALLEY, CA 91979-1612
PO BOX 1613, SPRING VALLEY, CA 91979-1613
PO BOX 1614, SPRING VALLEY, CA 91979-1614
PO BOX 1615, SPRING VALLEY, CA 91979-1615
PO BOX 1616, SPRING VALLEY, CA 91979-1616
PO BOX 1617, SPRING VALLEY, CA 91979-1617
PO BOX 1618, SPRING VALLEY, CA 91979-1618
PO BOX 1619, SPRING VALLEY, CA 91979-1619
PO BOX 1620, SPRING VALLEY, CA 91979-1620
PO BOX 1621, SPRING VALLEY, CA 91979-1621
PO BOX 1622, SPRING VALLEY, CA 91979-1622
PO BOX 1623, SPRING VALLEY, CA 91979-1623
PO BOX 1624, SPRING VALLEY, CA 91979-1624
PO BOX 1625, SPRING VALLEY, CA 91979-1625
PO BOX 1626, SPRING VALLEY, CA 91979-1626
PO BOX 1627, SPRING VALLEY, CA 91979-1627
PO BOX 1628, SPRING VALLEY, CA 91979-1628
PO BOX 1629, SPRING VALLEY, CA 91979-1629
PO BOX 1630, SPRING VALLEY, CA 91979-1630
PO BOX 1631, SPRING VALLEY, CA 91979-1631
PO BOX 1632, SPRING VALLEY, CA 91979-1632
PO BOX 1633, SPRING VALLEY, CA 91979-1633
PO BOX 1634, SPRING VALLEY, CA 91979-1634
PO BOX 1635, SPRING VALLEY, CA 91979-1635
PO BOX 1636, SPRING VALLEY, CA 91979-1636
PO BOX 1637, SPRING VALLEY, CA 91979-1637
PO BOX 1638, SPRING VALLEY, CA 91979-1638
PO BOX 1639, SPRING VALLEY, CA 91979-1639
PO BOX 1640, SPRING VALLEY, CA 91979-1640
PO BOX 1641, SPRING VALLEY, CA 91979-1641
PO BOX 1642, SPRING VALLEY, CA 91979-1642
PO BOX 1643, SPRING VALLEY, CA 91979-1643
PO BOX 1644, SPRING VALLEY, CA 91979-1644
PO BOX 1645, SPRING VALLEY, CA 91979-1645
PO BOX 1646, SPRING VALLEY, CA 91979-1646
PO BOX 1647, SPRING VALLEY, CA 91979-1647
PO BOX 1648, SPRING VALLEY, CA 91979-1648
PO BOX 1649, SPRING VALLEY, CA 91979-1649
PO BOX 1650, SPRING VALLEY, CA 91979-1650
PO BOX 1651, SPRING VALLEY, CA 91979-1651
PO BOX 1652, SPRING VALLEY, CA 91979-1652
PO BOX 1653, SPRING VALLEY, CA 91979-1653
PO BOX 1654, SPRING VALLEY, CA 91979-1654
PO BOX 1655, SPRING VALLEY, CA 91979-1655
PO BOX 1656, SPRING VALLEY, CA 91979-1656
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