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 16441, SAN DIEGO, CA 92176-6441
PO BOX 16442, SAN DIEGO, CA 92176-6442
PO BOX 16443, SAN DIEGO, CA 92176-6443
PO BOX 16444, SAN DIEGO, CA 92176-6444
PO BOX 16445, SAN DIEGO, CA 92176-6445
PO BOX 16446, SAN DIEGO, CA 92176-6446
PO BOX 16447, SAN DIEGO, CA 92176-6447
PO BOX 16448, SAN DIEGO, CA 92176-6448
PO BOX 16449, SAN DIEGO, CA 92176-6449
PO BOX 16450, SAN DIEGO, CA 92176-6450
PO BOX 16451, SAN DIEGO, CA 92176-6451
PO BOX 16452, SAN DIEGO, CA 92176-6452
PO BOX 16453, SAN DIEGO, CA 92176-6453
PO BOX 16454, SAN DIEGO, CA 92176-6454
PO BOX 16455, SAN DIEGO, CA 92176-6455
PO BOX 16456, SAN DIEGO, CA 92176-6456
PO BOX 16457, SAN DIEGO, CA 92176-6457
PO BOX 16458, SAN DIEGO, CA 92176-6458
PO BOX 16459, SAN DIEGO, CA 92176-6459
PO BOX 16460, SAN DIEGO, CA 92176-6460
PO BOX 16461, SAN DIEGO, CA 92176-6461
PO BOX 16462, SAN DIEGO, CA 92176-6462
PO BOX 16463, SAN DIEGO, CA 92176-6463
PO BOX 16464, SAN DIEGO, CA 92176-6464
PO BOX 16465, SAN DIEGO, CA 92176-6465
PO BOX 16466, SAN DIEGO, CA 92176-6466
PO BOX 16467, SAN DIEGO, CA 92176-6467
PO BOX 16468, SAN DIEGO, CA 92176-6468
PO BOX 16469, SAN DIEGO, CA 92176-6469
PO BOX 16470, SAN DIEGO, CA 92176-6470
PO BOX 16471, SAN DIEGO, CA 92176-6471
PO BOX 16472, SAN DIEGO, CA 92176-6472
PO BOX 16473, SAN DIEGO, CA 92176-6473
PO BOX 16474, SAN DIEGO, CA 92176-6474
PO BOX 16475, SAN DIEGO, CA 92176-6475
PO BOX 16476, SAN DIEGO, CA 92176-6476
PO BOX 16477, SAN DIEGO, CA 92176-6477
PO BOX 16478, SAN DIEGO, CA 92176-6478
PO BOX 16479, SAN DIEGO, CA 92176-6479
PO BOX 16480, SAN DIEGO, CA 92176-6480
PO BOX 16481, SAN DIEGO, CA 92176-6481
PO BOX 16482, SAN DIEGO, CA 92176-6482
PO BOX 16483, SAN DIEGO, CA 92176-6483
PO BOX 16484, SAN DIEGO, CA 92176-6484
PO BOX 16485, SAN DIEGO, CA 92176-6485
PO BOX 16486, SAN DIEGO, CA 92176-6486
PO BOX 16487, SAN DIEGO, CA 92176-6487
PO BOX 16488, SAN DIEGO, CA 92176-6488
PO BOX 16489, SAN DIEGO, CA 92176-6489
PO BOX 16490, SAN DIEGO, CA 92176-6490
PO BOX 16491, SAN DIEGO, CA 92176-6491
PO BOX 16492, SAN DIEGO, CA 92176-6492
PO BOX 16493, SAN DIEGO, CA 92176-6493
PO BOX 16494, SAN DIEGO, CA 92176-6494
PO BOX 16495, SAN DIEGO, CA 92176-6495
PO BOX 16496, SAN DIEGO, CA 92176-6496
PO BOX 16497, SAN DIEGO, CA 92176-6497
PO BOX 16498, SAN DIEGO, CA 92176-6498
PO BOX 16499, SAN DIEGO, CA 92176-6499
PO BOX 16500, SAN DIEGO, CA 92176-6500
PO BOX 16501, SAN DIEGO, CA 92176-6501
PO BOX 16502, SAN DIEGO, CA 92176-6502
PO BOX 16503, SAN DIEGO, CA 92176-6503
PO BOX 16504, SAN DIEGO, CA 92176-6504
PO BOX 16505, SAN DIEGO, CA 92176-6505
PO BOX 16506, SAN DIEGO, CA 92176-6506
PO BOX 16507, SAN DIEGO, CA 92176-6507
PO BOX 16508, SAN DIEGO, CA 92176-6508
PO BOX 16509, SAN DIEGO, CA 92176-6509
PO BOX 16510, SAN DIEGO, CA 92176-6510
PO BOX 16511, SAN DIEGO, CA 92176-6511
PO BOX 16512, SAN DIEGO, CA 92176-6512
PO BOX 16513, SAN DIEGO, CA 92176-6513
PO BOX 16514, SAN DIEGO, CA 92176-6514
PO BOX 16515, SAN DIEGO, CA 92176-6515
PO BOX 16516, SAN DIEGO, CA 92176-6516
PO BOX 16517, SAN DIEGO, CA 92176-6517
PO BOX 16518, SAN DIEGO, CA 92176-6518
PO BOX 16519, SAN DIEGO, CA 92176-6519
PO BOX 16520, SAN DIEGO, CA 92176-6520
PO BOX 16521, SAN DIEGO, CA 92176-6521
PO BOX 16522, SAN DIEGO, CA 92176-6522
PO BOX 16523, SAN DIEGO, CA 92176-6523
PO BOX 16524, SAN DIEGO, CA 92176-6524
PO BOX 16525, SAN DIEGO, CA 92176-6525
PO BOX 16526, SAN DIEGO, CA 92176-6526
PO BOX 16527, SAN DIEGO, CA 92176-6527
PO BOX 16528, SAN DIEGO, CA 92176-6528
PO BOX 16529, SAN DIEGO, CA 92176-6529
PO BOX 16530, SAN DIEGO, CA 92176-6530
PO BOX 16531, SAN DIEGO, CA 92176-6531
PO BOX 16532, SAN DIEGO, CA 92176-6532
PO BOX 16533, SAN DIEGO, CA 92176-6533
PO BOX 16534, SAN DIEGO, CA 92176-6534
PO BOX 16535, SAN DIEGO, CA 92176-6535
PO BOX 16536, SAN DIEGO, CA 92176-6536
PO BOX 16537, SAN DIEGO, CA 92176-6537
PO BOX 16538, SAN DIEGO, CA 92176-6538
PO BOX 16539, SAN DIEGO, CA 92176-6539
PO BOX 16540, SAN DIEGO, CA 92176-6540
PO BOX 16541, SAN DIEGO, CA 92176-6541
PO BOX 16542, SAN DIEGO, CA 92176-6542
PO BOX 16543, SAN DIEGO, CA 92176-6543
PO BOX 16544, SAN DIEGO, CA 92176-6544
PO BOX 16545, SAN DIEGO, CA 92176-6545
PO BOX 16546, SAN DIEGO, CA 92176-6546
PO BOX 16547, SAN DIEGO, CA 92176-6547
PO BOX 16548, SAN DIEGO, CA 92176-6548
PO BOX 16549, SAN DIEGO, CA 92176-6549
PO BOX 16550, SAN DIEGO, CA 92176-6550
PO BOX 16551, SAN DIEGO, CA 92176-6551
PO BOX 16552, SAN DIEGO, CA 92176-6552
PO BOX 16553, SAN DIEGO, CA 92176-6553
PO BOX 16554, SAN DIEGO, CA 92176-6554
PO BOX 16555, SAN DIEGO, CA 92176-6555
PO BOX 16556, SAN DIEGO, CA 92176-6556
PO BOX 16557, SAN DIEGO, CA 92176-6557
PO BOX 16558, SAN DIEGO, CA 92176-6558
PO BOX 16559, SAN DIEGO, CA 92176-6559
PO BOX 16560, SAN DIEGO, CA 92176-6560
PO BOX 16561, SAN DIEGO, CA 92176-6561
PO BOX 16562, SAN DIEGO, CA 92176-6562
PO BOX 16563, SAN DIEGO, CA 92176-6563
PO BOX 16564, SAN DIEGO, CA 92176-6564
PO BOX 16565, SAN DIEGO, CA 92176-6565
PO BOX 16566, SAN DIEGO, CA 92176-6566
PO BOX 16567, SAN DIEGO, CA 92176-6567
PO BOX 16568, SAN DIEGO, CA 92176-6568
PO BOX 16569, SAN DIEGO, CA 92176-6569
PO BOX 16570, SAN DIEGO, CA 92176-6570
PO BOX 16571, SAN DIEGO, CA 92176-6571
PO BOX 16572, SAN DIEGO, CA 92176-6572
PO BOX 16573, SAN DIEGO, CA 92176-6573
PO BOX 16574, SAN DIEGO, CA 92176-6574
PO BOX 16575, SAN DIEGO, CA 92176-6575
PO BOX 16576, SAN DIEGO, CA 92176-6576
PO BOX 16577, SAN DIEGO, CA 92176-6577
PO BOX 16578, SAN DIEGO, CA 92176-6578
PO BOX 16579, SAN DIEGO, CA 92176-6579
PO BOX 16580, SAN DIEGO, CA 92176-6580
PO BOX 16581, SAN DIEGO, CA 92176-6581
PO BOX 16582, SAN DIEGO, CA 92176-6582
PO BOX 16583, SAN DIEGO, CA 92176-6583
PO BOX 16584, SAN DIEGO, CA 92176-6584
PO BOX 16585, SAN DIEGO, CA 92176-6585
PO BOX 16586, SAN DIEGO, CA 92176-6586
PO BOX 16587, SAN DIEGO, CA 92176-6587
PO BOX 16588, SAN DIEGO, CA 92176-6588
PO BOX 16589, SAN DIEGO, CA 92176-6589
PO BOX 16590, SAN DIEGO, CA 92176-6590
PO BOX 16591, SAN DIEGO, CA 92176-6591
PO BOX 16592, SAN DIEGO, CA 92176-6592
PO BOX 16593, SAN DIEGO, CA 92176-6593
PO BOX 16594, SAN DIEGO, CA 92176-6594
PO BOX 16595, SAN DIEGO, CA 92176-6595
PO BOX 16596, SAN DIEGO, CA 92176-6596
PO BOX 16597, SAN DIEGO, CA 92176-6597
PO BOX 16598, SAN DIEGO, CA 92176-6598
PO BOX 16599, SAN DIEGO, CA 92176-6599
PO BOX 16600, SAN DIEGO, CA 92176-6600
PO BOX 16601, SAN DIEGO, CA 92176-6601
PO BOX 16602, SAN DIEGO, CA 92176-6602
PO BOX 16603, SAN DIEGO, CA 92176-6603
PO BOX 16604, SAN DIEGO, CA 92176-6604
PO BOX 16605, SAN DIEGO, CA 92176-6605
PO BOX 16606, SAN DIEGO, CA 92176-6606
PO BOX 16607, SAN DIEGO, CA 92176-6607
PO BOX 16608, SAN DIEGO, CA 92176-6608
PO BOX 16609, SAN DIEGO, CA 92176-6609
PO BOX 16610, SAN DIEGO, CA 92176-6610
PO BOX 16611, SAN DIEGO, CA 92176-6611
PO BOX 16612, SAN DIEGO, CA 92176-6612
PO BOX 16613, SAN DIEGO, CA 92176-6613
PO BOX 16614, SAN DIEGO, CA 92176-6614
PO BOX 16615, SAN DIEGO, CA 92176-6615
PO BOX 16616, SAN DIEGO, CA 92176-6616
PO BOX 16617, SAN DIEGO, CA 92176-6617
PO BOX 16618, SAN DIEGO, CA 92176-6618
PO BOX 16619, SAN DIEGO, CA 92176-6619
PO BOX 16620, SAN DIEGO, CA 92176-6620
PO BOX 16621, SAN DIEGO, CA 92176-6621
PO BOX 16622, SAN DIEGO, CA 92176-6622
PO BOX 16623, SAN DIEGO, CA 92176-6623
PO BOX 16624, SAN DIEGO, CA 92176-6624
PO BOX 16625, SAN DIEGO, CA 92176-6625
PO BOX 16626, SAN DIEGO, CA 92176-6626
PO BOX 16627, SAN DIEGO, CA 92176-6627
PO BOX 16628, SAN DIEGO, CA 92176-6628
PO BOX 16629, SAN DIEGO, CA 92176-6629
PO BOX 16630, SAN DIEGO, CA 92176-6630
PO BOX 16631, SAN DIEGO, CA 92176-6631
PO BOX 16632, SAN DIEGO, CA 92176-6632
PO BOX 16633, SAN DIEGO, CA 92176-6633
PO BOX 16634, SAN DIEGO, CA 92176-6634
PO BOX 16635, SAN DIEGO, CA 92176-6635
PO BOX 16636, SAN DIEGO, CA 92176-6636
PO BOX 16637, SAN DIEGO, CA 92176-6637
PO BOX 16638, SAN DIEGO, CA 92176-6638
PO BOX 16639, SAN DIEGO, CA 92176-6639
PO BOX 16640, SAN DIEGO, CA 92176-6640
PO BOX 16641, SAN DIEGO, CA 92176-6641
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