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, SAN MARCOS, CA 92079-1501
PO BOX 1502, SAN MARCOS, CA 92079-1502
PO BOX 1503, SAN MARCOS, CA 92079-1503
PO BOX 1504, SAN MARCOS, CA 92079-1504
PO BOX 1505, SAN MARCOS, CA 92079-1505
PO BOX 1506, SAN MARCOS, CA 92079-1506
PO BOX 1507, SAN MARCOS, CA 92079-1507
PO BOX 1508, SAN MARCOS, CA 92079-1508
PO BOX 1509, SAN MARCOS, CA 92079-1509
PO BOX 1510, SAN MARCOS, CA 92079-1510
PO BOX 1511, SAN MARCOS, CA 92079-1511
PO BOX 1512, SAN MARCOS, CA 92079-1512
PO BOX 1513, SAN MARCOS, CA 92079-1513
PO BOX 1514, SAN MARCOS, CA 92079-1514
PO BOX 1515, SAN MARCOS, CA 92079-1515
PO BOX 1516, SAN MARCOS, CA 92079-1516
PO BOX 1517, SAN MARCOS, CA 92079-1517
PO BOX 1518, SAN MARCOS, CA 92079-1518
PO BOX 1519, SAN MARCOS, CA 92079-1519
PO BOX 1520, SAN MARCOS, CA 92079-1520
PO BOX 1521, SAN MARCOS, CA 92079-1521
PO BOX 1522, SAN MARCOS, CA 92079-1522
PO BOX 1523, SAN MARCOS, CA 92079-1523
PO BOX 1524, SAN MARCOS, CA 92079-1524
PO BOX 1525, SAN MARCOS, CA 92079-1525
PO BOX 1526, SAN MARCOS, CA 92079-1526
PO BOX 1527, SAN MARCOS, CA 92079-1527
PO BOX 1528, SAN MARCOS, CA 92079-1528
PO BOX 1529, SAN MARCOS, CA 92079-1529
PO BOX 1530, SAN MARCOS, CA 92079-1530
PO BOX 1531, SAN MARCOS, CA 92079-1531
PO BOX 1532, SAN MARCOS, CA 92079-1532
PO BOX 1533, SAN MARCOS, CA 92079-1533
PO BOX 1534, SAN MARCOS, CA 92079-1534
PO BOX 1535, SAN MARCOS, CA 92079-1535
PO BOX 1536, SAN MARCOS, CA 92079-1536
PO BOX 1537, SAN MARCOS, CA 92079-1537
PO BOX 1538, SAN MARCOS, CA 92079-1538
PO BOX 1539, SAN MARCOS, CA 92079-1539
PO BOX 1540, SAN MARCOS, CA 92079-1540
PO BOX 1541, SAN MARCOS, CA 92079-1541
PO BOX 1542, SAN MARCOS, CA 92079-1542
PO BOX 1543, SAN MARCOS, CA 92079-1543
PO BOX 1544, SAN MARCOS, CA 92079-1544
PO BOX 1545, SAN MARCOS, CA 92079-1545
PO BOX 1546, SAN MARCOS, CA 92079-1546
PO BOX 1547, SAN MARCOS, CA 92079-1547
PO BOX 1548, SAN MARCOS, CA 92079-1548
PO BOX 1549, SAN MARCOS, CA 92079-1549
PO BOX 1550, SAN MARCOS, CA 92079-1550
PO BOX 1551, SAN MARCOS, CA 92079-1551
PO BOX 1552, SAN MARCOS, CA 92079-1552
PO BOX 1553, SAN MARCOS, CA 92079-1553
PO BOX 1554, SAN MARCOS, CA 92079-1554
PO BOX 1555, SAN MARCOS, CA 92079-1555
PO BOX 1556, SAN MARCOS, CA 92079-1556
PO BOX 1557, SAN MARCOS, CA 92079-1557
PO BOX 1558, SAN MARCOS, CA 92079-1558
PO BOX 1559, SAN MARCOS, CA 92079-1559
PO BOX 1560, SAN MARCOS, CA 92079-1560
PO BOX 1561, SAN MARCOS, CA 92079-1561
PO BOX 1562, SAN MARCOS, CA 92079-1562
PO BOX 1563, SAN MARCOS, CA 92079-1563
PO BOX 1564, SAN MARCOS, CA 92079-1564
PO BOX 1565, SAN MARCOS, CA 92079-1565
PO BOX 1566, SAN MARCOS, CA 92079-1566
PO BOX 1567, SAN MARCOS, CA 92079-1567
PO BOX 1568, SAN MARCOS, CA 92079-1568
PO BOX 1569, SAN MARCOS, CA 92079-1569
PO BOX 1570, SAN MARCOS, CA 92079-1570
PO BOX 1571, SAN MARCOS, CA 92079-1571
PO BOX 1572, SAN MARCOS, CA 92079-1572
PO BOX 1573, SAN MARCOS, CA 92079-1573
PO BOX 1574, SAN MARCOS, CA 92079-1574
PO BOX 1575, SAN MARCOS, CA 92079-1575
PO BOX 1576, SAN MARCOS, CA 92079-1576
PO BOX 1577, SAN MARCOS, CA 92079-1577
PO BOX 1578, SAN MARCOS, CA 92079-1578
PO BOX 1579, SAN MARCOS, CA 92079-1579
PO BOX 1580, SAN MARCOS, CA 92079-1580
PO BOX 1581, SAN MARCOS, CA 92079-1581
PO BOX 1582, SAN MARCOS, CA 92079-1582
PO BOX 1583, SAN MARCOS, CA 92079-1583
PO BOX 1584, SAN MARCOS, CA 92079-1584
PO BOX 1585, SAN MARCOS, CA 92079-1585
PO BOX 1586, SAN MARCOS, CA 92079-1586
PO BOX 1587, SAN MARCOS, CA 92079-1587
PO BOX 1588, SAN MARCOS, CA 92079-1588
PO BOX 1589, SAN MARCOS, CA 92079-1589
PO BOX 1590, SAN MARCOS, CA 92079-1590
PO BOX 1591, SAN MARCOS, CA 92079-1591
PO BOX 1592, SAN MARCOS, CA 92079-1592
PO BOX 1593, SAN MARCOS, CA 92079-1593
PO BOX 1594, SAN MARCOS, CA 92079-1594
PO BOX 1595, SAN MARCOS, CA 92079-1595
PO BOX 1596, SAN MARCOS, CA 92079-1596
PO BOX 1597, SAN MARCOS, CA 92079-1597
PO BOX 1598, SAN MARCOS, CA 92079-1598
PO BOX 1599, SAN MARCOS, CA 92079-1599
PO BOX 1600, SAN MARCOS, CA 92079-1600
PO BOX 1601, SAN MARCOS, CA 92079-1601
PO BOX 1602, SAN MARCOS, CA 92079-1602
PO BOX 1603, SAN MARCOS, CA 92079-1603
PO BOX 1604, SAN MARCOS, CA 92079-1604
PO BOX 1605, SAN MARCOS, CA 92079-1605
PO BOX 1606, SAN MARCOS, CA 92079-1606
PO BOX 1607, SAN MARCOS, CA 92079-1607
PO BOX 1608, SAN MARCOS, CA 92079-1608
PO BOX 1609, SAN MARCOS, CA 92079-1609
PO BOX 1610, SAN MARCOS, CA 92079-1610
PO BOX 1611, SAN MARCOS, CA 92079-1611
PO BOX 1612, SAN MARCOS, CA 92079-1612
PO BOX 1613, SAN MARCOS, CA 92079-1613
PO BOX 1614, SAN MARCOS, CA 92079-1614
PO BOX 1615, SAN MARCOS, CA 92079-1615
PO BOX 1616, SAN MARCOS, CA 92079-1616
PO BOX 1617, SAN MARCOS, CA 92079-1617
PO BOX 1618, SAN MARCOS, CA 92079-1618
PO BOX 1619, SAN MARCOS, CA 92079-1619
PO BOX 1620, SAN MARCOS, CA 92079-1620
PO BOX 1621, SAN MARCOS, CA 92079-1621
PO BOX 1622, SAN MARCOS, CA 92079-1622
PO BOX 1623, SAN MARCOS, CA 92079-1623
PO BOX 1624, SAN MARCOS, CA 92079-1624
PO BOX 1625, SAN MARCOS, CA 92079-1625
PO BOX 1626, SAN MARCOS, CA 92079-1626
PO BOX 1627, SAN MARCOS, CA 92079-1627
PO BOX 1628, SAN MARCOS, CA 92079-1628
PO BOX 1629, SAN MARCOS, CA 92079-1629
PO BOX 1630, SAN MARCOS, CA 92079-1630
PO BOX 1631, SAN MARCOS, CA 92079-1631
PO BOX 1632, SAN MARCOS, CA 92079-1632
PO BOX 1633, SAN MARCOS, CA 92079-1633
PO BOX 1634, SAN MARCOS, CA 92079-1634
PO BOX 1635, SAN MARCOS, CA 92079-1635
PO BOX 1636, SAN MARCOS, CA 92079-1636
PO BOX 1637, SAN MARCOS, CA 92079-1637
PO BOX 1638, SAN MARCOS, CA 92079-1638
PO BOX 1639, SAN MARCOS, CA 92079-1639
PO BOX 1640, SAN MARCOS, CA 92079-1640
PO BOX 1641, SAN MARCOS, CA 92079-1641
PO BOX 1642, SAN MARCOS, CA 92079-1642
PO BOX 1643, SAN MARCOS, CA 92079-1643
PO BOX 1644, SAN MARCOS, CA 92079-1644
PO BOX 1645, SAN MARCOS, CA 92079-1645
PO BOX 1646, SAN MARCOS, CA 92079-1646
PO BOX 1647, SAN MARCOS, CA 92079-1647
PO BOX 1648, SAN MARCOS, CA 92079-1648
PO BOX 1649, SAN MARCOS, CA 92079-1649
PO BOX 1650, SAN MARCOS, CA 92079-1650
PO BOX 1651, SAN MARCOS, CA 92079-1651
PO BOX 1652, SAN MARCOS, CA 92079-1652
PO BOX 1653, SAN MARCOS, CA 92079-1653
PO BOX 1654, SAN MARCOS, CA 92079-1654
PO BOX 1655, SAN MARCOS, CA 92079-1655
PO BOX 1656, SAN MARCOS, CA 92079-1656
PO BOX 1657, SAN MARCOS, CA 92079-1657
PO BOX 1658, SAN MARCOS, CA 92079-1658
PO BOX 1659, SAN MARCOS, CA 92079-1659
PO BOX 1660, SAN MARCOS, CA 92079-1660
PO BOX 1661, SAN MARCOS, CA 92079-1661
PO BOX 1662, SAN MARCOS, CA 92079-1662
PO BOX 1663, SAN MARCOS, CA 92079-1663
PO BOX 1664, SAN MARCOS, CA 92079-1664
PO BOX 1665, SAN MARCOS, CA 92079-1665
PO BOX 1666, SAN MARCOS, CA 92079-1666
PO BOX 1667, SAN MARCOS, CA 92079-1667
PO BOX 1668, SAN MARCOS, CA 92079-1668
PO BOX 1669, SAN MARCOS, CA 92079-1669
PO BOX 1670, SAN MARCOS, CA 92079-1670
PO BOX 1671, SAN MARCOS, CA 92079-1671
PO BOX 1672, SAN MARCOS, CA 92079-1672
PO BOX 1673, SAN MARCOS, CA 92079-1673
PO BOX 1674, SAN MARCOS, CA 92079-1674
PO BOX 1675, SAN MARCOS, CA 92079-1675
PO BOX 1676, SAN MARCOS, CA 92079-1676
PO BOX 1677, SAN MARCOS, CA 92079-1677
PO BOX 1678, SAN MARCOS, CA 92079-1678
PO BOX 1679, SAN MARCOS, CA 92079-1679
PO BOX 1680, SAN MARCOS, CA 92079-1680
PO BOX 1681, SAN MARCOS, CA 92079-1681
PO BOX 1682, SAN MARCOS, CA 92079-1682
PO BOX 1683, SAN MARCOS, CA 92079-1683
PO BOX 1684, SAN MARCOS, CA 92079-1684
PO BOX 1685, SAN MARCOS, CA 92079-1685
PO BOX 1686, SAN MARCOS, CA 92079-1686
PO BOX 1687, SAN MARCOS, CA 92079-1687
PO BOX 1688, SAN MARCOS, CA 92079-1688
PO BOX 1689, SAN MARCOS, CA 92079-1689
PO BOX 1690, SAN MARCOS, CA 92079-1690
PO BOX 1691, SAN MARCOS, CA 92079-1691
PO BOX 1692, SAN MARCOS, CA 92079-1692
PO BOX 1693, SAN MARCOS, CA 92079-1693
PO BOX 1694, SAN MARCOS, CA 92079-1694
PO BOX 1695, SAN MARCOS, CA 92079-1695
PO BOX 1696, SAN MARCOS, CA 92079-1696
PO BOX 1697, SAN MARCOS, CA 92079-1697
PO BOX 1698, SAN MARCOS, CA 92079-1698
PO BOX 1699, SAN MARCOS, CA 92079-1699
PO BOX 1700, SAN MARCOS, CA 92079-1700
PO BOX 1701, SAN MARCOS, CA 92079-1701
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