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 1501, BORREGO SPRINGS, CA 92004-1501
PO BOX 1502, BORREGO SPRINGS, CA 92004-1502
PO BOX 1503, BORREGO SPRINGS, CA 92004-1503
PO BOX 1504, BORREGO SPRINGS, CA 92004-1504
PO BOX 1505, BORREGO SPRINGS, CA 92004-1505
PO BOX 1506, BORREGO SPRINGS, CA 92004-1506
PO BOX 1507, BORREGO SPRINGS, CA 92004-1507
PO BOX 1508, BORREGO SPRINGS, CA 92004-1508
PO BOX 1509, BORREGO SPRINGS, CA 92004-1509
PO BOX 1510, BORREGO SPRINGS, CA 92004-1510
PO BOX 1511, BORREGO SPRINGS, CA 92004-1511
PO BOX 1512, BORREGO SPRINGS, CA 92004-1512
PO BOX 1513, BORREGO SPRINGS, CA 92004-1513
PO BOX 1514, BORREGO SPRINGS, CA 92004-1514
PO BOX 1515, BORREGO SPRINGS, CA 92004-1515
PO BOX 1516, BORREGO SPRINGS, CA 92004-1516
PO BOX 1517, BORREGO SPRINGS, CA 92004-1517
PO BOX 1518, BORREGO SPRINGS, CA 92004-1518
PO BOX 1519, BORREGO SPRINGS, CA 92004-1519
PO BOX 1520, BORREGO SPRINGS, CA 92004-1520
PO BOX 1521, BORREGO SPRINGS, CA 92004-1521
PO BOX 1522, BORREGO SPRINGS, CA 92004-1522
PO BOX 1523, BORREGO SPRINGS, CA 92004-1523
PO BOX 1524, BORREGO SPRINGS, CA 92004-1524
PO BOX 1525, BORREGO SPRINGS, CA 92004-1525
PO BOX 1526, BORREGO SPRINGS, CA 92004-1526
PO BOX 1527, BORREGO SPRINGS, CA 92004-1527
PO BOX 1528, BORREGO SPRINGS, CA 92004-1528
PO BOX 1529, BORREGO SPRINGS, CA 92004-1529
PO BOX 1530, BORREGO SPRINGS, CA 92004-1530
PO BOX 1531, BORREGO SPRINGS, CA 92004-1531
PO BOX 1532, BORREGO SPRINGS, CA 92004-1532
PO BOX 1533, BORREGO SPRINGS, CA 92004-1533
PO BOX 1534, BORREGO SPRINGS, CA 92004-1534
PO BOX 1535, BORREGO SPRINGS, CA 92004-1535
PO BOX 1536, BORREGO SPRINGS, CA 92004-1536
PO BOX 1537, BORREGO SPRINGS, CA 92004-1537
PO BOX 1538, BORREGO SPRINGS, CA 92004-1538
PO BOX 1539, BORREGO SPRINGS, CA 92004-1539
PO BOX 1540, BORREGO SPRINGS, CA 92004-1540
PO BOX 1541, BORREGO SPRINGS, CA 92004-1541
PO BOX 1542, BORREGO SPRINGS, CA 92004-1542
PO BOX 1543, BORREGO SPRINGS, CA 92004-1543
PO BOX 1544, BORREGO SPRINGS, CA 92004-1544
PO BOX 1545, BORREGO SPRINGS, CA 92004-1545
PO BOX 1546, BORREGO SPRINGS, CA 92004-1546
PO BOX 1547, BORREGO SPRINGS, CA 92004-1547
PO BOX 1548, BORREGO SPRINGS, CA 92004-1548
PO BOX 1549, BORREGO SPRINGS, CA 92004-1549
PO BOX 1550, BORREGO SPRINGS, CA 92004-1550
PO BOX 1551, BORREGO SPRINGS, CA 92004-1551
PO BOX 1552, BORREGO SPRINGS, CA 92004-1552
PO BOX 1553, BORREGO SPRINGS, CA 92004-1553
PO BOX 1554, BORREGO SPRINGS, CA 92004-1554
PO BOX 1555, BORREGO SPRINGS, CA 92004-1555
PO BOX 1556, BORREGO SPRINGS, CA 92004-1556
PO BOX 1557, BORREGO SPRINGS, CA 92004-1557
PO BOX 1558, BORREGO SPRINGS, CA 92004-1558
PO BOX 1559, BORREGO SPRINGS, CA 92004-1559
PO BOX 1560, BORREGO SPRINGS, CA 92004-1560
PO BOX 1561, BORREGO SPRINGS, CA 92004-1561
PO BOX 1562, BORREGO SPRINGS, CA 92004-1562
PO BOX 1563, BORREGO SPRINGS, CA 92004-1563
PO BOX 1564, BORREGO SPRINGS, CA 92004-1564
PO BOX 1565, BORREGO SPRINGS, CA 92004-1565
PO BOX 1566, BORREGO SPRINGS, CA 92004-1566
PO BOX 1567, BORREGO SPRINGS, CA 92004-1567
PO BOX 1568, BORREGO SPRINGS, CA 92004-1568
PO BOX 1569, BORREGO SPRINGS, CA 92004-1569
PO BOX 1570, BORREGO SPRINGS, CA 92004-1570
PO BOX 1571, BORREGO SPRINGS, CA 92004-1571
PO BOX 1572, BORREGO SPRINGS, CA 92004-1572
PO BOX 1573, BORREGO SPRINGS, CA 92004-1573
PO BOX 1574, BORREGO SPRINGS, CA 92004-1574
PO BOX 1575, BORREGO SPRINGS, CA 92004-1575
PO BOX 1576, BORREGO SPRINGS, CA 92004-1576
PO BOX 1577, BORREGO SPRINGS, CA 92004-1577
PO BOX 1578, BORREGO SPRINGS, CA 92004-1578
PO BOX 1579, BORREGO SPRINGS, CA 92004-1579
PO BOX 1580, BORREGO SPRINGS, CA 92004-1580
PO BOX 1581, BORREGO SPRINGS, CA 92004-1581
PO BOX 1582, BORREGO SPRINGS, CA 92004-1582
PO BOX 1583, BORREGO SPRINGS, CA 92004-1583
PO BOX 1584, BORREGO SPRINGS, CA 92004-1584
PO BOX 1585, BORREGO SPRINGS, CA 92004-1585
PO BOX 1586, BORREGO SPRINGS, CA 92004-1586
PO BOX 1587, BORREGO SPRINGS, CA 92004-1587
PO BOX 1588, BORREGO SPRINGS, CA 92004-1588
PO BOX 1589, BORREGO SPRINGS, CA 92004-1589
PO BOX 1590, BORREGO SPRINGS, CA 92004-1590
PO BOX 1591, BORREGO SPRINGS, CA 92004-1591
PO BOX 1592, BORREGO SPRINGS, CA 92004-1592
PO BOX 1593, BORREGO SPRINGS, CA 92004-1593
PO BOX 1594, BORREGO SPRINGS, CA 92004-1594
PO BOX 1595, BORREGO SPRINGS, CA 92004-1595
PO BOX 1596, BORREGO SPRINGS, CA 92004-1596
PO BOX 1597, BORREGO SPRINGS, CA 92004-1597
PO BOX 1598, BORREGO SPRINGS, CA 92004-1598
PO BOX 1599, BORREGO SPRINGS, CA 92004-1599
PO BOX 1600, BORREGO SPRINGS, CA 92004-1600
PO BOX 1601, BORREGO SPRINGS, CA 92004-1601
PO BOX 1602, BORREGO SPRINGS, CA 92004-1602
PO BOX 1603, BORREGO SPRINGS, CA 92004-1603
PO BOX 1604, BORREGO SPRINGS, CA 92004-1604
PO BOX 1605, BORREGO SPRINGS, CA 92004-1605
PO BOX 1606, BORREGO SPRINGS, CA 92004-1606
PO BOX 1607, BORREGO SPRINGS, CA 92004-1607
PO BOX 1608, BORREGO SPRINGS, CA 92004-1608
PO BOX 1609, BORREGO SPRINGS, CA 92004-1609
PO BOX 1610, BORREGO SPRINGS, CA 92004-1610
PO BOX 1611, BORREGO SPRINGS, CA 92004-1611
PO BOX 1612, BORREGO SPRINGS, CA 92004-1612
PO BOX 1613, BORREGO SPRINGS, CA 92004-1613
PO BOX 1614, BORREGO SPRINGS, CA 92004-1614
PO BOX 1615, BORREGO SPRINGS, CA 92004-1615
PO BOX 1616, BORREGO SPRINGS, CA 92004-1616
PO BOX 1617, BORREGO SPRINGS, CA 92004-1617
PO BOX 1618, BORREGO SPRINGS, CA 92004-1618
PO BOX 1619, BORREGO SPRINGS, CA 92004-1619
PO BOX 1620, BORREGO SPRINGS, CA 92004-1620
PO BOX 1621, BORREGO SPRINGS, CA 92004-1621
PO BOX 1622, BORREGO SPRINGS, CA 92004-1622
PO BOX 1623, BORREGO SPRINGS, CA 92004-1623
PO BOX 1624, BORREGO SPRINGS, CA 92004-1624
PO BOX 1625, BORREGO SPRINGS, CA 92004-1625
PO BOX 1626, BORREGO SPRINGS, CA 92004-1626
PO BOX 1627, BORREGO SPRINGS, CA 92004-1627
PO BOX 1628, BORREGO SPRINGS, CA 92004-1628
PO BOX 1629, BORREGO SPRINGS, CA 92004-1629
PO BOX 1630, BORREGO SPRINGS, CA 92004-1630
PO BOX 1631, BORREGO SPRINGS, CA 92004-1631
PO BOX 1632, BORREGO SPRINGS, CA 92004-1632
PO BOX 1633, BORREGO SPRINGS, CA 92004-1633
PO BOX 1634, BORREGO SPRINGS, CA 92004-1634
PO BOX 1635, BORREGO SPRINGS, CA 92004-1635
PO BOX 1636, BORREGO SPRINGS, CA 92004-1636
PO BOX 1637, BORREGO SPRINGS, CA 92004-1637
PO BOX 1638, BORREGO SPRINGS, CA 92004-1638
PO BOX 1639, BORREGO SPRINGS, CA 92004-1639
PO BOX 1640, BORREGO SPRINGS, CA 92004-1640
PO BOX 1641, BORREGO SPRINGS, CA 92004-1641
PO BOX 1642, BORREGO SPRINGS, CA 92004-1642
PO BOX 1643, BORREGO SPRINGS, CA 92004-1643
PO BOX 1644, BORREGO SPRINGS, CA 92004-1644
PO BOX 1645, BORREGO SPRINGS, CA 92004-1645
PO BOX 1646, BORREGO SPRINGS, CA 92004-1646
PO BOX 1647, BORREGO SPRINGS, CA 92004-1647
PO BOX 1648, BORREGO SPRINGS, CA 92004-1648
PO BOX 1649, BORREGO SPRINGS, CA 92004-1649
PO BOX 1650, BORREGO SPRINGS, CA 92004-1650
PO BOX 1651, BORREGO SPRINGS, CA 92004-1651
PO BOX 1652, BORREGO SPRINGS, CA 92004-1652
PO BOX 1653, BORREGO SPRINGS, CA 92004-1653
PO BOX 1654, BORREGO SPRINGS, CA 92004-1654
PO BOX 1655, BORREGO SPRINGS, CA 92004-1655
PO BOX 1656, BORREGO SPRINGS, CA 92004-1656
PO BOX 1657, BORREGO SPRINGS, CA 92004-1657
PO BOX 1658, BORREGO SPRINGS, CA 92004-1658
PO BOX 1659, BORREGO SPRINGS, CA 92004-1659
PO BOX 1660, BORREGO SPRINGS, CA 92004-1660
PO BOX 1661, BORREGO SPRINGS, CA 92004-1661
PO BOX 1662, BORREGO SPRINGS, CA 92004-1662
PO BOX 1663, BORREGO SPRINGS, CA 92004-1663
PO BOX 1664, BORREGO SPRINGS, CA 92004-1664
PO BOX 1665, BORREGO SPRINGS, CA 92004-1665
PO BOX 1666, BORREGO SPRINGS, CA 92004-1666
PO BOX 1667, BORREGO SPRINGS, CA 92004-1667
PO BOX 1668, BORREGO SPRINGS, CA 92004-1668
PO BOX 1669, BORREGO SPRINGS, CA 92004-1669
PO BOX 1670, BORREGO SPRINGS, CA 92004-1670
PO BOX 1671, BORREGO SPRINGS, CA 92004-1671
PO BOX 1672, BORREGO SPRINGS, CA 92004-1672
PO BOX 1673, BORREGO SPRINGS, CA 92004-1673
PO BOX 1674, BORREGO SPRINGS, CA 92004-1674
PO BOX 1675, BORREGO SPRINGS, CA 92004-1675
PO BOX 1676, BORREGO SPRINGS, CA 92004-1676
PO BOX 1677, BORREGO SPRINGS, CA 92004-1677
PO BOX 1678, BORREGO SPRINGS, CA 92004-1678
PO BOX 1679, BORREGO SPRINGS, CA 92004-1679
PO BOX 1680, BORREGO SPRINGS, CA 92004-1680
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