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, IMPERIAL BEACH, CA 91933-1501
PO BOX 1502, IMPERIAL BEACH, CA 91933-1502
PO BOX 1503, IMPERIAL BEACH, CA 91933-1503
PO BOX 1504, IMPERIAL BEACH, CA 91933-1504
PO BOX 1505, IMPERIAL BEACH, CA 91933-1505
PO BOX 1506, IMPERIAL BEACH, CA 91933-1506
PO BOX 1507, IMPERIAL BEACH, CA 91933-1507
PO BOX 1508, IMPERIAL BEACH, CA 91933-1508
PO BOX 1509, IMPERIAL BEACH, CA 91933-1509
PO BOX 1510, IMPERIAL BEACH, CA 91933-1510
PO BOX 1511, IMPERIAL BEACH, CA 91933-1511
PO BOX 1512, IMPERIAL BEACH, CA 91933-1512
PO BOX 1513, IMPERIAL BEACH, CA 91933-1513
PO BOX 1514, IMPERIAL BEACH, CA 91933-1514
PO BOX 1515, IMPERIAL BEACH, CA 91933-1515
PO BOX 1516, IMPERIAL BEACH, CA 91933-1516
PO BOX 1517, IMPERIAL BEACH, CA 91933-1517
PO BOX 1518, IMPERIAL BEACH, CA 91933-1518
PO BOX 1519, IMPERIAL BEACH, CA 91933-1519
PO BOX 1520, IMPERIAL BEACH, CA 91933-1520
PO BOX 1521, IMPERIAL BEACH, CA 91933-1521
PO BOX 1522, IMPERIAL BEACH, CA 91933-1522
PO BOX 1523, IMPERIAL BEACH, CA 91933-1523
PO BOX 1524, IMPERIAL BEACH, CA 91933-1524
PO BOX 1525, IMPERIAL BEACH, CA 91933-1525
PO BOX 1526, IMPERIAL BEACH, CA 91933-1526
PO BOX 1527, IMPERIAL BEACH, CA 91933-1527
PO BOX 1528, IMPERIAL BEACH, CA 91933-1528
PO BOX 1529, IMPERIAL BEACH, CA 91933-1529
PO BOX 1530, IMPERIAL BEACH, CA 91933-1530
PO BOX 1531, IMPERIAL BEACH, CA 91933-1531
PO BOX 1532, IMPERIAL BEACH, CA 91933-1532
PO BOX 1533, IMPERIAL BEACH, CA 91933-1533
PO BOX 1534, IMPERIAL BEACH, CA 91933-1534
PO BOX 1535, IMPERIAL BEACH, CA 91933-1535
PO BOX 1536, IMPERIAL BEACH, CA 91933-1536
PO BOX 1537, IMPERIAL BEACH, CA 91933-1537
PO BOX 1538, IMPERIAL BEACH, CA 91933-1538
PO BOX 1539, IMPERIAL BEACH, CA 91933-1539
PO BOX 1540, IMPERIAL BEACH, CA 91933-1540
PO BOX 1541, IMPERIAL BEACH, CA 91933-1541
PO BOX 1542, IMPERIAL BEACH, CA 91933-1542
PO BOX 1543, IMPERIAL BEACH, CA 91933-1543
PO BOX 1544, IMPERIAL BEACH, CA 91933-1544
PO BOX 1545, IMPERIAL BEACH, CA 91933-1545
PO BOX 1546, IMPERIAL BEACH, CA 91933-1546
PO BOX 1547, IMPERIAL BEACH, CA 91933-1547
PO BOX 1548, IMPERIAL BEACH, CA 91933-1548
PO BOX 1549, IMPERIAL BEACH, CA 91933-1549
PO BOX 1550, IMPERIAL BEACH, CA 91933-1550
PO BOX 1551, IMPERIAL BEACH, CA 91933-1551
PO BOX 1552, IMPERIAL BEACH, CA 91933-1552
PO BOX 1553, IMPERIAL BEACH, CA 91933-1553
PO BOX 1554, IMPERIAL BEACH, CA 91933-1554
PO BOX 1555, IMPERIAL BEACH, CA 91933-1555
PO BOX 1556, IMPERIAL BEACH, CA 91933-1556
PO BOX 1557, IMPERIAL BEACH, CA 91933-1557
PO BOX 1558, IMPERIAL BEACH, CA 91933-1558
PO BOX 1559, IMPERIAL BEACH, CA 91933-1559
PO BOX 1560, IMPERIAL BEACH, CA 91933-1560
PO BOX 1561, IMPERIAL BEACH, CA 91933-1561
PO BOX 1562, IMPERIAL BEACH, CA 91933-1562
PO BOX 1563, IMPERIAL BEACH, CA 91933-1563
PO BOX 1564, IMPERIAL BEACH, CA 91933-1564
PO BOX 1565, IMPERIAL BEACH, CA 91933-1565
PO BOX 1566, IMPERIAL BEACH, CA 91933-1566
PO BOX 1567, IMPERIAL BEACH, CA 91933-1567
PO BOX 1568, IMPERIAL BEACH, CA 91933-1568
PO BOX 1569, IMPERIAL BEACH, CA 91933-1569
PO BOX 1570, IMPERIAL BEACH, CA 91933-1570
PO BOX 1571, IMPERIAL BEACH, CA 91933-1571
PO BOX 1572, IMPERIAL BEACH, CA 91933-1572
PO BOX 1573, IMPERIAL BEACH, CA 91933-1573
PO BOX 1574, IMPERIAL BEACH, CA 91933-1574
PO BOX 1575, IMPERIAL BEACH, CA 91933-1575
PO BOX 1576, IMPERIAL BEACH, CA 91933-1576
PO BOX 1577, IMPERIAL BEACH, CA 91933-1577
PO BOX 1578, IMPERIAL BEACH, CA 91933-1578
PO BOX 1579, IMPERIAL BEACH, CA 91933-1579
PO BOX 1580, IMPERIAL BEACH, CA 91933-1580
PO BOX 1581, IMPERIAL BEACH, CA 91933-1581
PO BOX 1582, IMPERIAL BEACH, CA 91933-1582
PO BOX 1583, IMPERIAL BEACH, CA 91933-1583
PO BOX 1584, IMPERIAL BEACH, CA 91933-1584
PO BOX 1585, IMPERIAL BEACH, CA 91933-1585
PO BOX 1586, IMPERIAL BEACH, CA 91933-1586
PO BOX 1587, IMPERIAL BEACH, CA 91933-1587
PO BOX 1588, IMPERIAL BEACH, CA 91933-1588
PO BOX 1589, IMPERIAL BEACH, CA 91933-1589
PO BOX 1590, IMPERIAL BEACH, CA 91933-1590
PO BOX 1591, IMPERIAL BEACH, CA 91933-1591
PO BOX 1592, IMPERIAL BEACH, CA 91933-1592
PO BOX 1593, IMPERIAL BEACH, CA 91933-1593
PO BOX 1594, IMPERIAL BEACH, CA 91933-1594
PO BOX 1595, IMPERIAL BEACH, CA 91933-1595
PO BOX 1596, IMPERIAL BEACH, CA 91933-1596
PO BOX 1597, IMPERIAL BEACH, CA 91933-1597
PO BOX 1598, IMPERIAL BEACH, CA 91933-1598
PO BOX 1599, IMPERIAL BEACH, CA 91933-1599
PO BOX 1600, IMPERIAL BEACH, CA 91933-1600
PO BOX 1601, IMPERIAL BEACH, CA 91933-1601
PO BOX 1602, IMPERIAL BEACH, CA 91933-1602
PO BOX 1603, IMPERIAL BEACH, CA 91933-1603
PO BOX 1604, IMPERIAL BEACH, CA 91933-1604
PO BOX 1605, IMPERIAL BEACH, CA 91933-1605
PO BOX 1606, IMPERIAL BEACH, CA 91933-1606
PO BOX 1607, IMPERIAL BEACH, CA 91933-1607
PO BOX 1608, IMPERIAL BEACH, CA 91933-1608
PO BOX 1609, IMPERIAL BEACH, CA 91933-1609
PO BOX 1610, IMPERIAL BEACH, CA 91933-1610
PO BOX 1611, IMPERIAL BEACH, CA 91933-1611
PO BOX 1612, IMPERIAL BEACH, CA 91933-1612
PO BOX 1613, IMPERIAL BEACH, CA 91933-1613
PO BOX 1614, IMPERIAL BEACH, CA 91933-1614
PO BOX 1615, IMPERIAL BEACH, CA 91933-1615
PO BOX 1616, IMPERIAL BEACH, CA 91933-1616
PO BOX 1617, IMPERIAL BEACH, CA 91933-1617
PO BOX 1618, IMPERIAL BEACH, CA 91933-1618
PO BOX 1619, IMPERIAL BEACH, CA 91933-1619
PO BOX 1620, IMPERIAL BEACH, CA 91933-1620
PO BOX 1621, IMPERIAL BEACH, CA 91933-1621
PO BOX 1622, IMPERIAL BEACH, CA 91933-1622
PO BOX 1623, IMPERIAL BEACH, CA 91933-1623
PO BOX 1624, IMPERIAL BEACH, CA 91933-1624
PO BOX 1625, IMPERIAL BEACH, CA 91933-1625
PO BOX 1626, IMPERIAL BEACH, CA 91933-1626
PO BOX 1627, IMPERIAL BEACH, CA 91933-1627
PO BOX 1628, IMPERIAL BEACH, CA 91933-1628
PO BOX 1629, IMPERIAL BEACH, CA 91933-1629
PO BOX 1630, IMPERIAL BEACH, CA 91933-1630
PO BOX 1631, IMPERIAL BEACH, CA 91933-1631
PO BOX 1632, IMPERIAL BEACH, CA 91933-1632
PO BOX 1633, IMPERIAL BEACH, CA 91933-1633
PO BOX 1634, IMPERIAL BEACH, CA 91933-1634
PO BOX 1635, IMPERIAL BEACH, CA 91933-1635
PO BOX 1636, IMPERIAL BEACH, CA 91933-1636
PO BOX 1637, IMPERIAL BEACH, CA 91933-1637
PO BOX 1638, IMPERIAL BEACH, CA 91933-1638
PO BOX 1639, IMPERIAL BEACH, CA 91933-1639
PO BOX 1640, IMPERIAL BEACH, CA 91933-1640
PO BOX 1641, IMPERIAL BEACH, CA 91933-1641
PO BOX 1642, IMPERIAL BEACH, CA 91933-1642
PO BOX 1643, IMPERIAL BEACH, CA 91933-1643
PO BOX 1644, IMPERIAL BEACH, CA 91933-1644
PO BOX 1645, IMPERIAL BEACH, CA 91933-1645
PO BOX 1646, IMPERIAL BEACH, CA 91933-1646
PO BOX 1647, IMPERIAL BEACH, CA 91933-1647
PO BOX 1648, IMPERIAL BEACH, CA 91933-1648
PO BOX 1649, IMPERIAL BEACH, CA 91933-1649
PO BOX 1650, IMPERIAL BEACH, CA 91933-1650
PO BOX 1651, IMPERIAL BEACH, CA 91933-1651
PO BOX 1652, IMPERIAL BEACH, CA 91933-1652
PO BOX 1653, IMPERIAL BEACH, CA 91933-1653
PO BOX 1654, IMPERIAL BEACH, CA 91933-1654
PO BOX 1655, IMPERIAL BEACH, CA 91933-1655
PO BOX 1656, IMPERIAL BEACH, CA 91933-1656
PO BOX 1657, IMPERIAL BEACH, CA 91933-1657
PO BOX 1658, IMPERIAL BEACH, CA 91933-1658
PO BOX 1659, IMPERIAL BEACH, CA 91933-1659
PO BOX 1660, IMPERIAL BEACH, CA 91933-1660
PO BOX 1661, IMPERIAL BEACH, CA 91933-1661
PO BOX 1662, IMPERIAL BEACH, CA 91933-1662
PO BOX 1663, IMPERIAL BEACH, CA 91933-1663
PO BOX 1664, IMPERIAL BEACH, CA 91933-1664
PO BOX 1665, IMPERIAL BEACH, CA 91933-1665
PO BOX 1666, IMPERIAL BEACH, CA 91933-1666
PO BOX 1667, IMPERIAL BEACH, CA 91933-1667
PO BOX 1668, IMPERIAL BEACH, CA 91933-1668
PO BOX 1669, IMPERIAL BEACH, CA 91933-1669
PO BOX 1670, IMPERIAL BEACH, CA 91933-1670
PO BOX 1671, IMPERIAL BEACH, CA 91933-1671
PO BOX 1672, IMPERIAL BEACH, CA 91933-1672
PO BOX 1673, IMPERIAL BEACH, CA 91933-1673
PO BOX 1674, IMPERIAL BEACH, CA 91933-1674
PO BOX 1675, IMPERIAL BEACH, CA 91933-1675
PO BOX 1676, IMPERIAL BEACH, CA 91933-1676
PO BOX 1677, IMPERIAL BEACH, CA 91933-1677
PO BOX 1678, IMPERIAL BEACH, CA 91933-1678
PO BOX 1679, IMPERIAL BEACH, CA 91933-1679
PO BOX 1680, IMPERIAL BEACH, CA 91933-1680
PO BOX 1681, IMPERIAL BEACH, CA 91933-1681
PO BOX 1682, IMPERIAL BEACH, CA 91933-1682
PO BOX 1683, IMPERIAL BEACH, CA 91933-1683
PO BOX 1684, IMPERIAL BEACH, CA 91933-1684
PO BOX 1685, IMPERIAL BEACH, CA 91933-1685
PO BOX 1686, IMPERIAL BEACH, CA 91933-1686
PO BOX 1687, IMPERIAL BEACH, CA 91933-1687
PO BOX 1688, IMPERIAL BEACH, CA 91933-1688
PO BOX 1689, IMPERIAL BEACH, CA 91933-1689
PO BOX 1690, IMPERIAL BEACH, CA 91933-1690
PO BOX 1691, IMPERIAL BEACH, CA 91933-1691
PO BOX 1692, IMPERIAL BEACH, CA 91933-1692
PO BOX 1693, IMPERIAL BEACH, CA 91933-1693
PO BOX 1694, IMPERIAL BEACH, CA 91933-1694
PO BOX 1695, IMPERIAL BEACH, CA 91933-1695
PO BOX 1696, IMPERIAL BEACH, CA 91933-1696
PO BOX 1697, IMPERIAL BEACH, CA 91933-1697
PO BOX 1698, IMPERIAL BEACH, CA 91933-1698
PO BOX 1699, IMPERIAL BEACH, CA 91933-1699
PO BOX 1700, IMPERIAL BEACH, CA 91933-1700
PO BOX 1701, IMPERIAL BEACH, CA 91933-1701
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