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 1491, HIGHLAND PARK, IL 60035-7491
PO BOX 1492, HIGHLAND PARK, IL 60035-7492
PO BOX 1493, HIGHLAND PARK, IL 60035-7493
PO BOX 1494, HIGHLAND PARK, IL 60035-7494
PO BOX 1495, HIGHLAND PARK, IL 60035-7495
PO BOX 1496, HIGHLAND PARK, IL 60035-7496
PO BOX 1497, HIGHLAND PARK, IL 60035-7497
PO BOX 1498, HIGHLAND PARK, IL 60035-7498
PO BOX 1499, HIGHLAND PARK, IL 60035-7499
PO BOX 1500, HIGHLAND PARK, IL 60035-7500
PO BOX 1501, HIGHLAND PARK, IL 60035-7501
PO BOX 1502, HIGHLAND PARK, IL 60035-7502
PO BOX 1503, HIGHLAND PARK, IL 60035-7503
PO BOX 1504, HIGHLAND PARK, IL 60035-7504
PO BOX 1505, HIGHLAND PARK, IL 60035-7505
PO BOX 1506, HIGHLAND PARK, IL 60035-7506
PO BOX 1507, HIGHLAND PARK, IL 60035-7507
PO BOX 1508, HIGHLAND PARK, IL 60035-7508
PO BOX 1509, HIGHLAND PARK, IL 60035-7509
PO BOX 1510, HIGHLAND PARK, IL 60035-7510
PO BOX 1511, HIGHLAND PARK, IL 60035-7511
PO BOX 1512, HIGHLAND PARK, IL 60035-7512
PO BOX 1513, HIGHLAND PARK, IL 60035-7513
PO BOX 1514, HIGHLAND PARK, IL 60035-7514
PO BOX 1515, HIGHLAND PARK, IL 60035-7515
PO BOX 1516, HIGHLAND PARK, IL 60035-7516
PO BOX 1517, HIGHLAND PARK, IL 60035-7517
PO BOX 1518, HIGHLAND PARK, IL 60035-7518
PO BOX 1519, HIGHLAND PARK, IL 60035-7519
PO BOX 1520, HIGHLAND PARK, IL 60035-7520
PO BOX 1521, HIGHLAND PARK, IL 60035-7521
PO BOX 1522, HIGHLAND PARK, IL 60035-7522
PO BOX 1523, HIGHLAND PARK, IL 60035-7523
PO BOX 1524, HIGHLAND PARK, IL 60035-7524
PO BOX 1525, HIGHLAND PARK, IL 60035-7525
PO BOX 1526, HIGHLAND PARK, IL 60035-7526
PO BOX 1527, HIGHLAND PARK, IL 60035-7527
PO BOX 1528, HIGHLAND PARK, IL 60035-7528
PO BOX 1529, HIGHLAND PARK, IL 60035-7529
PO BOX 1530, HIGHLAND PARK, IL 60035-7530
PO BOX 1531, HIGHLAND PARK, IL 60035-7531
PO BOX 1532, HIGHLAND PARK, IL 60035-7532
PO BOX 1533, HIGHLAND PARK, IL 60035-7533
PO BOX 1534, HIGHLAND PARK, IL 60035-7534
PO BOX 1535, HIGHLAND PARK, IL 60035-7535
PO BOX 1536, HIGHLAND PARK, IL 60035-7536
PO BOX 1537, HIGHLAND PARK, IL 60035-7537
PO BOX 1538, HIGHLAND PARK, IL 60035-7538
PO BOX 1539, HIGHLAND PARK, IL 60035-7539
PO BOX 1540, HIGHLAND PARK, IL 60035-7540
PO BOX 1541, HIGHLAND PARK, IL 60035-7541
PO BOX 1542, HIGHLAND PARK, IL 60035-7542
PO BOX 1543, HIGHLAND PARK, IL 60035-7543
PO BOX 1544, HIGHLAND PARK, IL 60035-7544
PO BOX 1545, HIGHLAND PARK, IL 60035-7545
PO BOX 1546, HIGHLAND PARK, IL 60035-7546
PO BOX 1547, HIGHLAND PARK, IL 60035-7547
PO BOX 1548, HIGHLAND PARK, IL 60035-7548
PO BOX 1549, HIGHLAND PARK, IL 60035-7549
PO BOX 1550, HIGHLAND PARK, IL 60035-7550
PO BOX 1551, HIGHLAND PARK, IL 60035-7551
PO BOX 1552, HIGHLAND PARK, IL 60035-7552
PO BOX 1553, HIGHLAND PARK, IL 60035-7553
PO BOX 1554, HIGHLAND PARK, IL 60035-7554
PO BOX 1555, HIGHLAND PARK, IL 60035-7555
PO BOX 1556, HIGHLAND PARK, IL 60035-7556
PO BOX 1557, HIGHLAND PARK, IL 60035-7557
PO BOX 1558, HIGHLAND PARK, IL 60035-7558
PO BOX 1559, HIGHLAND PARK, IL 60035-7559
PO BOX 1560, HIGHLAND PARK, IL 60035-7560
PO BOX 1561, HIGHLAND PARK, IL 60035-7561
PO BOX 1562, HIGHLAND PARK, IL 60035-7562
PO BOX 1563, HIGHLAND PARK, IL 60035-7563
PO BOX 1564, HIGHLAND PARK, IL 60035-7564
PO BOX 1565, HIGHLAND PARK, IL 60035-7565
PO BOX 1566, HIGHLAND PARK, IL 60035-7566
PO BOX 1567, HIGHLAND PARK, IL 60035-7567
PO BOX 1568, HIGHLAND PARK, IL 60035-7568
PO BOX 1569, HIGHLAND PARK, IL 60035-7569
PO BOX 1570, HIGHLAND PARK, IL 60035-7570
PO BOX 1571, HIGHLAND PARK, IL 60035-7571
PO BOX 1572, HIGHLAND PARK, IL 60035-7572
PO BOX 1573, HIGHLAND PARK, IL 60035-7573
PO BOX 1574, HIGHLAND PARK, IL 60035-7574
PO BOX 1575, HIGHLAND PARK, IL 60035-7575
PO BOX 1576, HIGHLAND PARK, IL 60035-7576
PO BOX 1577, HIGHLAND PARK, IL 60035-7577
PO BOX 1578, HIGHLAND PARK, IL 60035-7578
PO BOX 1579, HIGHLAND PARK, IL 60035-7579
PO BOX 1580, HIGHLAND PARK, IL 60035-7580
PO BOX 1581, HIGHLAND PARK, IL 60035-7581
PO BOX 1582, HIGHLAND PARK, IL 60035-7582
PO BOX 1583, HIGHLAND PARK, IL 60035-7583
PO BOX 1584, HIGHLAND PARK, IL 60035-7584
PO BOX 1585, HIGHLAND PARK, IL 60035-7585
PO BOX 1586, HIGHLAND PARK, IL 60035-7586
PO BOX 1587, HIGHLAND PARK, IL 60035-7587
PO BOX 1588, HIGHLAND PARK, IL 60035-7588
PO BOX 1589, HIGHLAND PARK, IL 60035-7589
PO BOX 1590, HIGHLAND PARK, IL 60035-7590
PO BOX 1591, HIGHLAND PARK, IL 60035-7591
PO BOX 1592, HIGHLAND PARK, IL 60035-7592
PO BOX 1593, HIGHLAND PARK, IL 60035-7593
PO BOX 1594, HIGHLAND PARK, IL 60035-7594
PO BOX 1595, HIGHLAND PARK, IL 60035-7595
PO BOX 1596, HIGHLAND PARK, IL 60035-7596
PO BOX 1597, HIGHLAND PARK, IL 60035-7597
PO BOX 1598, HIGHLAND PARK, IL 60035-7598
PO BOX 1599, HIGHLAND PARK, IL 60035-7599
PO BOX 1600, HIGHLAND PARK, IL 60035-7600
PO BOX 1601, HIGHLAND PARK, IL 60035-7601
PO BOX 1602, HIGHLAND PARK, IL 60035-7602
PO BOX 1603, HIGHLAND PARK, IL 60035-7603
PO BOX 1604, HIGHLAND PARK, IL 60035-7604
PO BOX 1605, HIGHLAND PARK, IL 60035-7605
PO BOX 1606, HIGHLAND PARK, IL 60035-7606
PO BOX 1607, HIGHLAND PARK, IL 60035-7607
PO BOX 1608, HIGHLAND PARK, IL 60035-7608
PO BOX 1609, HIGHLAND PARK, IL 60035-7609
PO BOX 1610, HIGHLAND PARK, IL 60035-7610
PO BOX 1611, HIGHLAND PARK, IL 60035-7611
PO BOX 1612, HIGHLAND PARK, IL 60035-7612
PO BOX 1613, HIGHLAND PARK, IL 60035-7613
PO BOX 1614, HIGHLAND PARK, IL 60035-7614
PO BOX 1615, HIGHLAND PARK, IL 60035-7615
PO BOX 1616, HIGHLAND PARK, IL 60035-7616
PO BOX 1617, HIGHLAND PARK, IL 60035-7617
PO BOX 1618, HIGHLAND PARK, IL 60035-7618
PO BOX 1619, HIGHLAND PARK, IL 60035-7619
PO BOX 1620, HIGHLAND PARK, IL 60035-7620
PO BOX 1621, HIGHLAND PARK, IL 60035-7621
PO BOX 1622, HIGHLAND PARK, IL 60035-7622
PO BOX 1623, HIGHLAND PARK, IL 60035-7623
PO BOX 1624, HIGHLAND PARK, IL 60035-7624
PO BOX 1625, HIGHLAND PARK, IL 60035-7625
PO BOX 1626, HIGHLAND PARK, IL 60035-7626
PO BOX 1627, HIGHLAND PARK, IL 60035-7627
PO BOX 1628, HIGHLAND PARK, IL 60035-7628
PO BOX 1629, HIGHLAND PARK, IL 60035-7629
PO BOX 1630, HIGHLAND PARK, IL 60035-7630
PO BOX 1631, HIGHLAND PARK, IL 60035-7631
PO BOX 1632, HIGHLAND PARK, IL 60035-7632
PO BOX 1633, HIGHLAND PARK, IL 60035-7633
PO BOX 1634, HIGHLAND PARK, IL 60035-7634
PO BOX 1635, HIGHLAND PARK, IL 60035-7635
PO BOX 1636, HIGHLAND PARK, IL 60035-7636
PO BOX 1637, HIGHLAND PARK, IL 60035-7637
PO BOX 1638, HIGHLAND PARK, IL 60035-7638
PO BOX 1639, HIGHLAND PARK, IL 60035-7639
PO BOX 1640, HIGHLAND PARK, IL 60035-7640
PO BOX 1641, HIGHLAND PARK, IL 60035-7641
PO BOX 1642, HIGHLAND PARK, IL 60035-7642
PO BOX 1643, HIGHLAND PARK, IL 60035-7643
PO BOX 1644, HIGHLAND PARK, IL 60035-7644
PO BOX 1645, HIGHLAND PARK, IL 60035-7645
PO BOX 1646, HIGHLAND PARK, IL 60035-7646
PO BOX 1647, HIGHLAND PARK, IL 60035-7647
PO BOX 1648, HIGHLAND PARK, IL 60035-7648
PO BOX 1649, HIGHLAND PARK, IL 60035-7649
PO BOX 1650, HIGHLAND PARK, IL 60035-7650
PO BOX 1651, HIGHLAND PARK, IL 60035-7651
PO BOX 1652, HIGHLAND PARK, IL 60035-7652
PO BOX 1653, HIGHLAND PARK, IL 60035-7653
PO BOX 1654, HIGHLAND PARK, IL 60035-7654
PO BOX 1655, HIGHLAND PARK, IL 60035-7655
PO BOX 1656, HIGHLAND PARK, IL 60035-7656
PO BOX 1657, HIGHLAND PARK, IL 60035-7657
PO BOX 1658, HIGHLAND PARK, IL 60035-7658
PO BOX 1659, HIGHLAND PARK, IL 60035-7659
PO BOX 1660, HIGHLAND PARK, IL 60035-7660
PO BOX 1661, HIGHLAND PARK, IL 60035-7661
PO BOX 1662, HIGHLAND PARK, IL 60035-7662
PO BOX 1663, HIGHLAND PARK, IL 60035-7663
PO BOX 1664, HIGHLAND PARK, IL 60035-7664
PO BOX 1665, HIGHLAND PARK, IL 60035-7665
PO BOX 1666, HIGHLAND PARK, IL 60035-7666
PO BOX 1667, HIGHLAND PARK, IL 60035-7667
PO BOX 1668, HIGHLAND PARK, IL 60035-7668
PO BOX 1669, HIGHLAND PARK, IL 60035-7669
PO BOX 1670, HIGHLAND PARK, IL 60035-7670
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