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 11461, SANTA BARBARA, CA 93107-1461
PO BOX 11462, SANTA BARBARA, CA 93107-1462
PO BOX 11463, SANTA BARBARA, CA 93107-1463
PO BOX 11464, SANTA BARBARA, CA 93107-1464
PO BOX 11465, SANTA BARBARA, CA 93107-1465
PO BOX 11466, SANTA BARBARA, CA 93107-1466
PO BOX 11467, SANTA BARBARA, CA 93107-1467
PO BOX 11468, SANTA BARBARA, CA 93107-1468
PO BOX 11469, SANTA BARBARA, CA 93107-1469
PO BOX 11470, SANTA BARBARA, CA 93107-1470
PO BOX 11471, SANTA BARBARA, CA 93107-1471
PO BOX 11472, SANTA BARBARA, CA 93107-1472
PO BOX 11473, SANTA BARBARA, CA 93107-1473
PO BOX 11474, SANTA BARBARA, CA 93107-1474
PO BOX 11475, SANTA BARBARA, CA 93107-1475
PO BOX 11476, SANTA BARBARA, CA 93107-1476
PO BOX 11477, SANTA BARBARA, CA 93107-1477
PO BOX 11478, SANTA BARBARA, CA 93107-1478
PO BOX 11479, SANTA BARBARA, CA 93107-1479
PO BOX 11480, SANTA BARBARA, CA 93107-1480
PO BOX 11481, SANTA BARBARA, CA 93107-1481
PO BOX 11482, SANTA BARBARA, CA 93107-1482
PO BOX 11483, SANTA BARBARA, CA 93107-1483
PO BOX 11484, SANTA BARBARA, CA 93107-1484
PO BOX 11485, SANTA BARBARA, CA 93107-1485
PO BOX 11486, SANTA BARBARA, CA 93107-1486
PO BOX 11487, SANTA BARBARA, CA 93107-1487
PO BOX 11488, SANTA BARBARA, CA 93107-1488
PO BOX 11489, SANTA BARBARA, CA 93107-1489
PO BOX 11490, SANTA BARBARA, CA 93107-1490
PO BOX 11491, SANTA BARBARA, CA 93107-1491
PO BOX 11492, SANTA BARBARA, CA 93107-1492
PO BOX 11493, SANTA BARBARA, CA 93107-1493
PO BOX 11494, SANTA BARBARA, CA 93107-1494
PO BOX 11495, SANTA BARBARA, CA 93107-1495
PO BOX 11496, SANTA BARBARA, CA 93107-1496
PO BOX 11497, SANTA BARBARA, CA 93107-1497
PO BOX 11498, SANTA BARBARA, CA 93107-1498
PO BOX 11499, SANTA BARBARA, CA 93107-1499
PO BOX 11500, SANTA BARBARA, CA 93107-1500
PO BOX 11501, SANTA BARBARA, CA 93107-1501
PO BOX 11502, SANTA BARBARA, CA 93107-1502
PO BOX 11503, SANTA BARBARA, CA 93107-1503
PO BOX 11504, SANTA BARBARA, CA 93107-1504
PO BOX 11505, SANTA BARBARA, CA 93107-1505
PO BOX 11506, SANTA BARBARA, CA 93107-1506
PO BOX 11507, SANTA BARBARA, CA 93107-1507
PO BOX 11508, SANTA BARBARA, CA 93107-1508
PO BOX 11509, SANTA BARBARA, CA 93107-1509
PO BOX 11510, SANTA BARBARA, CA 93107-1510
PO BOX 11511, SANTA BARBARA, CA 93107-1511
PO BOX 11512, SANTA BARBARA, CA 93107-1512
PO BOX 11513, SANTA BARBARA, CA 93107-1513
PO BOX 11514, SANTA BARBARA, CA 93107-1514
PO BOX 11515, SANTA BARBARA, CA 93107-1515
PO BOX 11516, SANTA BARBARA, CA 93107-1516
PO BOX 11517, SANTA BARBARA, CA 93107-1517
PO BOX 11518, SANTA BARBARA, CA 93107-1518
PO BOX 11519, SANTA BARBARA, CA 93107-1519
PO BOX 11520, SANTA BARBARA, CA 93107-1520
PO BOX 11521, SANTA BARBARA, CA 93107-1521
PO BOX 11522, SANTA BARBARA, CA 93107-1522
PO BOX 11523, SANTA BARBARA, CA 93107-1523
PO BOX 11524, SANTA BARBARA, CA 93107-1524
PO BOX 11525, SANTA BARBARA, CA 93107-1525
PO BOX 11526, SANTA BARBARA, CA 93107-1526
PO BOX 11527, SANTA BARBARA, CA 93107-1527
PO BOX 11528, SANTA BARBARA, CA 93107-1528
PO BOX 11529, SANTA BARBARA, CA 93107-1529
PO BOX 11530, SANTA BARBARA, CA 93107-1530
PO BOX 11531, SANTA BARBARA, CA 93107-1531
PO BOX 11532, SANTA BARBARA, CA 93107-1532
PO BOX 11533, SANTA BARBARA, CA 93107-1533
PO BOX 11534, SANTA BARBARA, CA 93107-1534
PO BOX 11535, SANTA BARBARA, CA 93107-1535
PO BOX 11536, SANTA BARBARA, CA 93107-1536
PO BOX 11537, SANTA BARBARA, CA 93107-1537
PO BOX 11538, SANTA BARBARA, CA 93107-1538
PO BOX 11539, SANTA BARBARA, CA 93107-1539
PO BOX 11540, SANTA BARBARA, CA 93107-1540
PO BOX 11541, SANTA BARBARA, CA 93107-1541
PO BOX 11542, SANTA BARBARA, CA 93107-1542
PO BOX 11543, SANTA BARBARA, CA 93107-1543
PO BOX 11544, SANTA BARBARA, CA 93107-1544
PO BOX 11545, SANTA BARBARA, CA 93107-1545
PO BOX 11546, SANTA BARBARA, CA 93107-1546
PO BOX 11547, SANTA BARBARA, CA 93107-1547
PO BOX 11548, SANTA BARBARA, CA 93107-1548
PO BOX 11549, SANTA BARBARA, CA 93107-1549
PO BOX 11550, SANTA BARBARA, CA 93107-1550
PO BOX 11551, SANTA BARBARA, CA 93107-1551
PO BOX 11552, SANTA BARBARA, CA 93107-1552
PO BOX 11553, SANTA BARBARA, CA 93107-1553
PO BOX 11554, SANTA BARBARA, CA 93107-1554
PO BOX 11555, SANTA BARBARA, CA 93107-1555
PO BOX 11556, SANTA BARBARA, CA 93107-1556
PO BOX 11557, SANTA BARBARA, CA 93107-1557
PO BOX 11558, SANTA BARBARA, CA 93107-1558
PO BOX 11559, SANTA BARBARA, CA 93107-1559
PO BOX 11560, SANTA BARBARA, CA 93107-1560
PO BOX 11561, SANTA BARBARA, CA 93107-1561
PO BOX 11562, SANTA BARBARA, CA 93107-1562
PO BOX 11563, SANTA BARBARA, CA 93107-1563
PO BOX 11564, SANTA BARBARA, CA 93107-1564
PO BOX 11565, SANTA BARBARA, CA 93107-1565
PO BOX 11566, SANTA BARBARA, CA 93107-1566
PO BOX 11567, SANTA BARBARA, CA 93107-1567
PO BOX 11568, SANTA BARBARA, CA 93107-1568
PO BOX 11569, SANTA BARBARA, CA 93107-1569
PO BOX 11570, SANTA BARBARA, CA 93107-1570
PO BOX 11571, SANTA BARBARA, CA 93107-1571
PO BOX 11572, SANTA BARBARA, CA 93107-1572
PO BOX 11573, SANTA BARBARA, CA 93107-1573
PO BOX 11574, SANTA BARBARA, CA 93107-1574
PO BOX 11575, SANTA BARBARA, CA 93107-1575
PO BOX 11576, SANTA BARBARA, CA 93107-1576
PO BOX 11577, SANTA BARBARA, CA 93107-1577
PO BOX 11578, SANTA BARBARA, CA 93107-1578
PO BOX 11579, SANTA BARBARA, CA 93107-1579
PO BOX 11580, SANTA BARBARA, CA 93107-1580
PO BOX 11581, SANTA BARBARA, CA 93107-1581
PO BOX 11582, SANTA BARBARA, CA 93107-1582
PO BOX 11583, SANTA BARBARA, CA 93107-1583
PO BOX 11584, SANTA BARBARA, CA 93107-1584
PO BOX 11585, SANTA BARBARA, CA 93107-1585
PO BOX 11586, SANTA BARBARA, CA 93107-1586
PO BOX 11587, SANTA BARBARA, CA 93107-1587
PO BOX 11588, SANTA BARBARA, CA 93107-1588
PO BOX 11589, SANTA BARBARA, CA 93107-1589
PO BOX 11590, SANTA BARBARA, CA 93107-1590
PO BOX 11591, SANTA BARBARA, CA 93107-1591
PO BOX 11592, SANTA BARBARA, CA 93107-1592
PO BOX 11593, SANTA BARBARA, CA 93107-1593
PO BOX 11594, SANTA BARBARA, CA 93107-1594
PO BOX 11595, SANTA BARBARA, CA 93107-1595
PO BOX 11596, SANTA BARBARA, CA 93107-1596
PO BOX 11597, SANTA BARBARA, CA 93107-1597
PO BOX 11598, SANTA BARBARA, CA 93107-1598
PO BOX 11599, SANTA BARBARA, CA 93107-1599
PO BOX 11600, SANTA BARBARA, CA 93107-1600
PO BOX 11601, SANTA BARBARA, CA 93107-1601
PO BOX 11602, SANTA BARBARA, CA 93107-1602
PO BOX 11603, SANTA BARBARA, CA 93107-1603
PO BOX 11604, SANTA BARBARA, CA 93107-1604
PO BOX 11605, SANTA BARBARA, CA 93107-1605
PO BOX 11606, SANTA BARBARA, CA 93107-1606
PO BOX 11607, SANTA BARBARA, CA 93107-1607
PO BOX 11608, SANTA BARBARA, CA 93107-1608
PO BOX 11609, SANTA BARBARA, CA 93107-1609
PO BOX 11610, SANTA BARBARA, CA 93107-1610
PO BOX 11611, SANTA BARBARA, CA 93107-1611
PO BOX 11612, SANTA BARBARA, CA 93107-1612
PO BOX 11613, SANTA BARBARA, CA 93107-1613
PO BOX 11614, SANTA BARBARA, CA 93107-1614
PO BOX 11615, SANTA BARBARA, CA 93107-1615
PO BOX 11616, SANTA BARBARA, CA 93107-1616
PO BOX 11617, SANTA BARBARA, CA 93107-1617
PO BOX 11618, SANTA BARBARA, CA 93107-1618
PO BOX 11619, SANTA BARBARA, CA 93107-1619
PO BOX 11620, SANTA BARBARA, CA 93107-1620
PO BOX 11621, SANTA BARBARA, CA 93107-1621
PO BOX 11622, SANTA BARBARA, CA 93107-1622
PO BOX 11623, SANTA BARBARA, CA 93107-1623
PO BOX 11624, SANTA BARBARA, CA 93107-1624
PO BOX 11625, SANTA BARBARA, CA 93107-1625
PO BOX 11626, SANTA BARBARA, CA 93107-1626
PO BOX 11627, SANTA BARBARA, CA 93107-1627
PO BOX 11628, SANTA BARBARA, CA 93107-1628
PO BOX 11629, SANTA BARBARA, CA 93107-1629
PO BOX 11630, SANTA BARBARA, CA 93107-1630
PO BOX 11631, SANTA BARBARA, CA 93107-1631
PO BOX 11632, SANTA BARBARA, CA 93107-1632
PO BOX 11633, SANTA BARBARA, CA 93107-1633
PO BOX 11634, SANTA BARBARA, CA 93107-1634
PO BOX 11635, SANTA BARBARA, CA 93107-1635
PO BOX 11636, SANTA BARBARA, CA 93107-1636
PO BOX 11637, SANTA BARBARA, CA 93107-1637
PO BOX 11638, SANTA BARBARA, CA 93107-1638
PO BOX 11639, SANTA BARBARA, CA 93107-1639
PO BOX 11640, SANTA BARBARA, CA 93107-1640
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