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 27501, SAN DIEGO, CA 92198-1501
PO BOX 27502, SAN DIEGO, CA 92198-1502
PO BOX 27503, SAN DIEGO, CA 92198-1503
PO BOX 27504, SAN DIEGO, CA 92198-1504
PO BOX 27505, SAN DIEGO, CA 92198-1505
PO BOX 27506, SAN DIEGO, CA 92198-1506
PO BOX 27507, SAN DIEGO, CA 92198-1507
PO BOX 27508, SAN DIEGO, CA 92198-1508
PO BOX 27509, SAN DIEGO, CA 92198-1509
PO BOX 27510, SAN DIEGO, CA 92198-1510
PO BOX 27511, SAN DIEGO, CA 92198-1511
PO BOX 27512, SAN DIEGO, CA 92198-1512
PO BOX 27513, SAN DIEGO, CA 92198-1513
PO BOX 27514, SAN DIEGO, CA 92198-1514
PO BOX 27515, SAN DIEGO, CA 92198-1515
PO BOX 27516, SAN DIEGO, CA 92198-1516
PO BOX 27517, SAN DIEGO, CA 92198-1517
PO BOX 27518, SAN DIEGO, CA 92198-1518
PO BOX 27519, SAN DIEGO, CA 92198-1519
PO BOX 27520, SAN DIEGO, CA 92198-1520
PO BOX 27521, SAN DIEGO, CA 92198-1521
PO BOX 27522, SAN DIEGO, CA 92198-1522
PO BOX 27523, SAN DIEGO, CA 92198-1523
PO BOX 27524, SAN DIEGO, CA 92198-1524
PO BOX 27525, SAN DIEGO, CA 92198-1525
PO BOX 27526, SAN DIEGO, CA 92198-1526
PO BOX 27527, SAN DIEGO, CA 92198-1527
PO BOX 27528, SAN DIEGO, CA 92198-1528
PO BOX 27529, SAN DIEGO, CA 92198-1529
PO BOX 27530, SAN DIEGO, CA 92198-1530
PO BOX 27531, SAN DIEGO, CA 92198-1531
PO BOX 27532, SAN DIEGO, CA 92198-1532
PO BOX 27533, SAN DIEGO, CA 92198-1533
PO BOX 27534, SAN DIEGO, CA 92198-1534
PO BOX 27535, SAN DIEGO, CA 92198-1535
PO BOX 27536, SAN DIEGO, CA 92198-1536
PO BOX 27537, SAN DIEGO, CA 92198-1537
PO BOX 27538, SAN DIEGO, CA 92198-1538
PO BOX 27539, SAN DIEGO, CA 92198-1539
PO BOX 27540, SAN DIEGO, CA 92198-1540
PO BOX 27541, SAN DIEGO, CA 92198-1541
PO BOX 27542, SAN DIEGO, CA 92198-1542
PO BOX 27543, SAN DIEGO, CA 92198-1543
PO BOX 27544, SAN DIEGO, CA 92198-1544
PO BOX 27545, SAN DIEGO, CA 92198-1545
PO BOX 27546, SAN DIEGO, CA 92198-1546
PO BOX 27547, SAN DIEGO, CA 92198-1547
PO BOX 27548, SAN DIEGO, CA 92198-1548
PO BOX 27549, SAN DIEGO, CA 92198-1549
PO BOX 27550, SAN DIEGO, CA 92198-1550
PO BOX 27551, SAN DIEGO, CA 92198-1551
PO BOX 27552, SAN DIEGO, CA 92198-1552
PO BOX 27553, SAN DIEGO, CA 92198-1553
PO BOX 27554, SAN DIEGO, CA 92198-1554
PO BOX 27555, SAN DIEGO, CA 92198-1555
PO BOX 27556, SAN DIEGO, CA 92198-1556
PO BOX 27557, SAN DIEGO, CA 92198-1557
PO BOX 27558, SAN DIEGO, CA 92198-1558
PO BOX 27559, SAN DIEGO, CA 92198-1559
PO BOX 27560, SAN DIEGO, CA 92198-1560
PO BOX 27561, SAN DIEGO, CA 92198-1561
PO BOX 27562, SAN DIEGO, CA 92198-1562
PO BOX 27563, SAN DIEGO, CA 92198-1563
PO BOX 27564, SAN DIEGO, CA 92198-1564
PO BOX 27565, SAN DIEGO, CA 92198-1565
PO BOX 27566, SAN DIEGO, CA 92198-1566
PO BOX 27567, SAN DIEGO, CA 92198-1567
PO BOX 27568, SAN DIEGO, CA 92198-1568
PO BOX 27569, SAN DIEGO, CA 92198-1569
PO BOX 27570, SAN DIEGO, CA 92198-1570
PO BOX 27571, SAN DIEGO, CA 92198-1571
PO BOX 27572, SAN DIEGO, CA 92198-1572
PO BOX 27573, SAN DIEGO, CA 92198-1573
PO BOX 27574, SAN DIEGO, CA 92198-1574
PO BOX 27575, SAN DIEGO, CA 92198-1575
PO BOX 27576, SAN DIEGO, CA 92198-1576
PO BOX 27577, SAN DIEGO, CA 92198-1577
PO BOX 27578, SAN DIEGO, CA 92198-1578
PO BOX 27579, SAN DIEGO, CA 92198-1579
PO BOX 27580, SAN DIEGO, CA 92198-1580
PO BOX 27581, SAN DIEGO, CA 92198-1581
PO BOX 27582, SAN DIEGO, CA 92198-1582
PO BOX 27583, SAN DIEGO, CA 92198-1583
PO BOX 27584, SAN DIEGO, CA 92198-1584
PO BOX 27585, SAN DIEGO, CA 92198-1585
PO BOX 27586, SAN DIEGO, CA 92198-1586
PO BOX 27587, SAN DIEGO, CA 92198-1587
PO BOX 27588, SAN DIEGO, CA 92198-1588
PO BOX 27589, SAN DIEGO, CA 92198-1589
PO BOX 27590, SAN DIEGO, CA 92198-1590
PO BOX 27591, SAN DIEGO, CA 92198-1591
PO BOX 27592, SAN DIEGO, CA 92198-1592
PO BOX 27593, SAN DIEGO, CA 92198-1593
PO BOX 27594, SAN DIEGO, CA 92198-1594
PO BOX 27595, SAN DIEGO, CA 92198-1595
PO BOX 27596, SAN DIEGO, CA 92198-1596
PO BOX 27597, SAN DIEGO, CA 92198-1597
PO BOX 27598, SAN DIEGO, CA 92198-1598
PO BOX 27599, SAN DIEGO, CA 92198-1599
PO BOX 27600, SAN DIEGO, CA 92198-1600
PO BOX 27601, SAN DIEGO, CA 92198-1601
PO BOX 27602, SAN DIEGO, CA 92198-1602
PO BOX 27603, SAN DIEGO, CA 92198-1603
PO BOX 27604, SAN DIEGO, CA 92198-1604
PO BOX 27605, SAN DIEGO, CA 92198-1605
PO BOX 27606, SAN DIEGO, CA 92198-1606
PO BOX 27607, SAN DIEGO, CA 92198-1607
PO BOX 27608, SAN DIEGO, CA 92198-1608
PO BOX 27609, SAN DIEGO, CA 92198-1609
PO BOX 27610, SAN DIEGO, CA 92198-1610
PO BOX 27611, SAN DIEGO, CA 92198-1611
PO BOX 27612, SAN DIEGO, CA 92198-1612
PO BOX 27613, SAN DIEGO, CA 92198-1613
PO BOX 27614, SAN DIEGO, CA 92198-1614
PO BOX 27615, SAN DIEGO, CA 92198-1615
PO BOX 27616, SAN DIEGO, CA 92198-1616
PO BOX 27617, SAN DIEGO, CA 92198-1617
PO BOX 27618, SAN DIEGO, CA 92198-1618
PO BOX 27619, SAN DIEGO, CA 92198-1619
PO BOX 27620, SAN DIEGO, CA 92198-1620
PO BOX 27621, SAN DIEGO, CA 92198-1621
PO BOX 27622, SAN DIEGO, CA 92198-1622
PO BOX 27623, SAN DIEGO, CA 92198-1623
PO BOX 27624, SAN DIEGO, CA 92198-1624
PO BOX 27625, SAN DIEGO, CA 92198-1625
PO BOX 27626, SAN DIEGO, CA 92198-1626
PO BOX 27627, SAN DIEGO, CA 92198-1627
PO BOX 27628, SAN DIEGO, CA 92198-1628
PO BOX 27629, SAN DIEGO, CA 92198-1629
PO BOX 27630, SAN DIEGO, CA 92198-1630
PO BOX 27631, SAN DIEGO, CA 92198-1631
PO BOX 27632, SAN DIEGO, CA 92198-1632
PO BOX 27633, SAN DIEGO, CA 92198-1633
PO BOX 27634, SAN DIEGO, CA 92198-1634
PO BOX 27635, SAN DIEGO, CA 92198-1635
PO BOX 27636, SAN DIEGO, CA 92198-1636
PO BOX 27637, SAN DIEGO, CA 92198-1637
PO BOX 27638, SAN DIEGO, CA 92198-1638
PO BOX 27639, SAN DIEGO, CA 92198-1639
PO BOX 27640, SAN DIEGO, CA 92198-1640
PO BOX 27641, SAN DIEGO, CA 92198-1641
PO BOX 27642, SAN DIEGO, CA 92198-1642
PO BOX 27643, SAN DIEGO, CA 92198-1643
PO BOX 27644, SAN DIEGO, CA 92198-1644
PO BOX 27645, SAN DIEGO, CA 92198-1645
PO BOX 27646, SAN DIEGO, CA 92198-1646
PO BOX 27647, SAN DIEGO, CA 92198-1647
PO BOX 27648, SAN DIEGO, CA 92198-1648
PO BOX 27649, SAN DIEGO, CA 92198-1649
PO BOX 27650, SAN DIEGO, CA 92198-1650
PO BOX 27651, SAN DIEGO, CA 92198-1651
PO BOX 27652, SAN DIEGO, CA 92198-1652
PO BOX 27653, SAN DIEGO, CA 92198-1653
PO BOX 27654, SAN DIEGO, CA 92198-1654
PO BOX 27655, SAN DIEGO, CA 92198-1655
PO BOX 27656, SAN DIEGO, CA 92198-1656
PO BOX 27657, SAN DIEGO, CA 92198-1657
PO BOX 27658, SAN DIEGO, CA 92198-1658
PO BOX 27659, SAN DIEGO, CA 92198-1659
PO BOX 27660, SAN DIEGO, CA 92198-1660
PO BOX 27661, SAN DIEGO, CA 92198-1661
PO BOX 27662, SAN DIEGO, CA 92198-1662
PO BOX 27663, SAN DIEGO, CA 92198-1663
PO BOX 27664, SAN DIEGO, CA 92198-1664
PO BOX 27665, SAN DIEGO, CA 92198-1665
PO BOX 27666, SAN DIEGO, CA 92198-1666
PO BOX 27667, SAN DIEGO, CA 92198-1667
PO BOX 27668, SAN DIEGO, CA 92198-1668
PO BOX 27669, SAN DIEGO, CA 92198-1669
PO BOX 27670, SAN DIEGO, CA 92198-1670
PO BOX 27671, SAN DIEGO, CA 92198-1671
PO BOX 27672, SAN DIEGO, CA 92198-1672
PO BOX 27673, SAN DIEGO, CA 92198-1673
PO BOX 27674, SAN DIEGO, CA 92198-1674
PO BOX 27675, SAN DIEGO, CA 92198-1675
PO BOX 27676, SAN DIEGO, CA 92198-1676
PO BOX 27677, SAN DIEGO, CA 92198-1677
PO BOX 27678, SAN DIEGO, CA 92198-1678
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