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 10441, CANOGA PARK, CA 91309-1441
PO BOX 10442, CANOGA PARK, CA 91309-1442
PO BOX 10443, CANOGA PARK, CA 91309-1443
PO BOX 10444, CANOGA PARK, CA 91309-1444
PO BOX 10445, CANOGA PARK, CA 91309-1445
PO BOX 10446, CANOGA PARK, CA 91309-1446
PO BOX 10447, CANOGA PARK, CA 91309-1447
PO BOX 10448, CANOGA PARK, CA 91309-1448
PO BOX 10449, CANOGA PARK, CA 91309-1449
PO BOX 10450, CANOGA PARK, CA 91309-1450
PO BOX 10451, CANOGA PARK, CA 91309-1451
PO BOX 10452, CANOGA PARK, CA 91309-1452
PO BOX 10453, CANOGA PARK, CA 91309-1453
PO BOX 10454, CANOGA PARK, CA 91309-1454
PO BOX 10455, CANOGA PARK, CA 91309-1455
PO BOX 10456, CANOGA PARK, CA 91309-1456
PO BOX 10457, CANOGA PARK, CA 91309-1457
PO BOX 10458, CANOGA PARK, CA 91309-1458
PO BOX 10459, CANOGA PARK, CA 91309-1459
PO BOX 10460, CANOGA PARK, CA 91309-1460
PO BOX 10461, CANOGA PARK, CA 91309-1461
PO BOX 10462, CANOGA PARK, CA 91309-1462
PO BOX 10463, CANOGA PARK, CA 91309-1463
PO BOX 10464, CANOGA PARK, CA 91309-1464
PO BOX 10465, CANOGA PARK, CA 91309-1465
PO BOX 10466, CANOGA PARK, CA 91309-1466
PO BOX 10467, CANOGA PARK, CA 91309-1467
PO BOX 10468, CANOGA PARK, CA 91309-1468
PO BOX 10469, CANOGA PARK, CA 91309-1469
PO BOX 10470, CANOGA PARK, CA 91309-1470
PO BOX 10471, CANOGA PARK, CA 91309-1471
PO BOX 10472, CANOGA PARK, CA 91309-1472
PO BOX 10473, CANOGA PARK, CA 91309-1473
PO BOX 10474, CANOGA PARK, CA 91309-1474
PO BOX 10475, CANOGA PARK, CA 91309-1475
PO BOX 10476, CANOGA PARK, CA 91309-1476
PO BOX 10477, CANOGA PARK, CA 91309-1477
PO BOX 10478, CANOGA PARK, CA 91309-1478
PO BOX 10479, CANOGA PARK, CA 91309-1479
PO BOX 10480, CANOGA PARK, CA 91309-1480
PO BOX 10481, CANOGA PARK, CA 91309-1481
PO BOX 10482, CANOGA PARK, CA 91309-1482
PO BOX 10483, CANOGA PARK, CA 91309-1483
PO BOX 10484, CANOGA PARK, CA 91309-1484
PO BOX 10485, CANOGA PARK, CA 91309-1485
PO BOX 10486, CANOGA PARK, CA 91309-1486
PO BOX 10487, CANOGA PARK, CA 91309-1487
PO BOX 10488, CANOGA PARK, CA 91309-1488
PO BOX 10489, CANOGA PARK, CA 91309-1489
PO BOX 10490, CANOGA PARK, CA 91309-1490
PO BOX 10491, CANOGA PARK, CA 91309-1491
PO BOX 10492, CANOGA PARK, CA 91309-1492
PO BOX 10493, CANOGA PARK, CA 91309-1493
PO BOX 10494, CANOGA PARK, CA 91309-1494
PO BOX 10495, CANOGA PARK, CA 91309-1495
PO BOX 10496, CANOGA PARK, CA 91309-1496
PO BOX 10497, CANOGA PARK, CA 91309-1497
PO BOX 10498, CANOGA PARK, CA 91309-1498
PO BOX 10499, CANOGA PARK, CA 91309-1499
PO BOX 10500, CANOGA PARK, CA 91309-1500
PO BOX 10501, CANOGA PARK, CA 91309-1501
PO BOX 10502, CANOGA PARK, CA 91309-1502
PO BOX 10503, CANOGA PARK, CA 91309-1503
PO BOX 10504, CANOGA PARK, CA 91309-1504
PO BOX 10505, CANOGA PARK, CA 91309-1505
PO BOX 10506, CANOGA PARK, CA 91309-1506
PO BOX 10507, CANOGA PARK, CA 91309-1507
PO BOX 10508, CANOGA PARK, CA 91309-1508
PO BOX 10509, CANOGA PARK, CA 91309-1509
PO BOX 10510, CANOGA PARK, CA 91309-1510
PO BOX 10511, CANOGA PARK, CA 91309-1511
PO BOX 10512, CANOGA PARK, CA 91309-1512
PO BOX 10513, CANOGA PARK, CA 91309-1513
PO BOX 10514, CANOGA PARK, CA 91309-1514
PO BOX 10515, CANOGA PARK, CA 91309-1515
PO BOX 10516, CANOGA PARK, CA 91309-1516
PO BOX 10517, CANOGA PARK, CA 91309-1517
PO BOX 10518, CANOGA PARK, CA 91309-1518
PO BOX 10519, CANOGA PARK, CA 91309-1519
PO BOX 10520, CANOGA PARK, CA 91309-1520
PO BOX 10521, CANOGA PARK, CA 91309-1521
PO BOX 10522, CANOGA PARK, CA 91309-1522
PO BOX 10523, CANOGA PARK, CA 91309-1523
PO BOX 10524, CANOGA PARK, CA 91309-1524
PO BOX 10525, CANOGA PARK, CA 91309-1525
PO BOX 10526, CANOGA PARK, CA 91309-1526
PO BOX 10527, CANOGA PARK, CA 91309-1527
PO BOX 10528, CANOGA PARK, CA 91309-1528
PO BOX 10529, CANOGA PARK, CA 91309-1529
PO BOX 10530, CANOGA PARK, CA 91309-1530
PO BOX 10531, CANOGA PARK, CA 91309-1531
PO BOX 10532, CANOGA PARK, CA 91309-1532
PO BOX 10533, CANOGA PARK, CA 91309-1533
PO BOX 10534, CANOGA PARK, CA 91309-1534
PO BOX 10535, CANOGA PARK, CA 91309-1535
PO BOX 10536, CANOGA PARK, CA 91309-1536
PO BOX 10537, CANOGA PARK, CA 91309-1537
PO BOX 10538, CANOGA PARK, CA 91309-1538
PO BOX 10539, CANOGA PARK, CA 91309-1539
PO BOX 10540, CANOGA PARK, CA 91309-1540
PO BOX 10541, CANOGA PARK, CA 91309-1541
PO BOX 10542, CANOGA PARK, CA 91309-1542
PO BOX 10543, CANOGA PARK, CA 91309-1543
PO BOX 10544, CANOGA PARK, CA 91309-1544
PO BOX 10545, CANOGA PARK, CA 91309-1545
PO BOX 10546, CANOGA PARK, CA 91309-1546
PO BOX 10547, CANOGA PARK, CA 91309-1547
PO BOX 10548, CANOGA PARK, CA 91309-1548
PO BOX 10549, CANOGA PARK, CA 91309-1549
PO BOX 10550, CANOGA PARK, CA 91309-1550
PO BOX 10551, CANOGA PARK, CA 91309-1551
PO BOX 10552, CANOGA PARK, CA 91309-1552
PO BOX 10553, CANOGA PARK, CA 91309-1553
PO BOX 10554, CANOGA PARK, CA 91309-1554
PO BOX 10555, CANOGA PARK, CA 91309-1555
PO BOX 10556, CANOGA PARK, CA 91309-1556
PO BOX 10557, CANOGA PARK, CA 91309-1557
PO BOX 10558, CANOGA PARK, CA 91309-1558
PO BOX 10559, CANOGA PARK, CA 91309-1559
PO BOX 10560, CANOGA PARK, CA 91309-1560
PO BOX 10561, CANOGA PARK, CA 91309-1561
PO BOX 10562, CANOGA PARK, CA 91309-1562
PO BOX 10563, CANOGA PARK, CA 91309-1563
PO BOX 10564, CANOGA PARK, CA 91309-1564
PO BOX 10565, CANOGA PARK, CA 91309-1565
PO BOX 10566, CANOGA PARK, CA 91309-1566
PO BOX 10567, CANOGA PARK, CA 91309-1567
PO BOX 10568, CANOGA PARK, CA 91309-1568
PO BOX 10569, CANOGA PARK, CA 91309-1569
PO BOX 10570, CANOGA PARK, CA 91309-1570
PO BOX 10571, CANOGA PARK, CA 91309-1571
PO BOX 10572, CANOGA PARK, CA 91309-1572
PO BOX 10573, CANOGA PARK, CA 91309-1573
PO BOX 10574, CANOGA PARK, CA 91309-1574
PO BOX 10575, CANOGA PARK, CA 91309-1575
PO BOX 10576, CANOGA PARK, CA 91309-1576
PO BOX 10577, CANOGA PARK, CA 91309-1577
PO BOX 10578, CANOGA PARK, CA 91309-1578
PO BOX 10579, CANOGA PARK, CA 91309-1579
PO BOX 10580, CANOGA PARK, CA 91309-1580
PO BOX 10581, CANOGA PARK, CA 91309-1581
PO BOX 10582, CANOGA PARK, CA 91309-1582
PO BOX 10583, CANOGA PARK, CA 91309-1583
PO BOX 10584, CANOGA PARK, CA 91309-1584
PO BOX 10585, CANOGA PARK, CA 91309-1585
PO BOX 10586, CANOGA PARK, CA 91309-1586
PO BOX 10587, CANOGA PARK, CA 91309-1587
PO BOX 10588, CANOGA PARK, CA 91309-1588
PO BOX 10589, CANOGA PARK, CA 91309-1589
PO BOX 10590, CANOGA PARK, CA 91309-1590
PO BOX 10591, CANOGA PARK, CA 91309-1591
PO BOX 10592, CANOGA PARK, CA 91309-1592
PO BOX 10593, CANOGA PARK, CA 91309-1593
PO BOX 10594, CANOGA PARK, CA 91309-1594
PO BOX 10595, CANOGA PARK, CA 91309-1595
PO BOX 10596, CANOGA PARK, CA 91309-1596
PO BOX 10597, CANOGA PARK, CA 91309-1597
PO BOX 10598, CANOGA PARK, CA 91309-1598
PO BOX 10599, CANOGA PARK, CA 91309-1599
PO BOX 10600, CANOGA PARK, CA 91309-1600
PO BOX 10601, CANOGA PARK, CA 91309-1601
PO BOX 10602, CANOGA PARK, CA 91309-1602
PO BOX 10603, CANOGA PARK, CA 91309-1603
PO BOX 10604, CANOGA PARK, CA 91309-1604
PO BOX 10605, CANOGA PARK, CA 91309-1605
PO BOX 10606, CANOGA PARK, CA 91309-1606
PO BOX 10607, CANOGA PARK, CA 91309-1607
PO BOX 10608, CANOGA PARK, CA 91309-1608
PO BOX 10609, CANOGA PARK, CA 91309-1609
PO BOX 10610, CANOGA PARK, CA 91309-1610
PO BOX 10611, CANOGA PARK, CA 91309-1611
PO BOX 10612, CANOGA PARK, CA 91309-1612
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