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 910441, SAN DIEGO, CA 92191-0441
PO BOX 910442, SAN DIEGO, CA 92191-0442
PO BOX 910443, SAN DIEGO, CA 92191-0443
PO BOX 910444, SAN DIEGO, CA 92191-0444
PO BOX 910445, SAN DIEGO, CA 92191-0445
PO BOX 910446, SAN DIEGO, CA 92191-0446
PO BOX 910447, SAN DIEGO, CA 92191-0447
PO BOX 910448, SAN DIEGO, CA 92191-0448
PO BOX 910449, SAN DIEGO, CA 92191-0449
PO BOX 910450, SAN DIEGO, CA 92191-0450
PO BOX 910451, SAN DIEGO, CA 92191-0451
PO BOX 910452, SAN DIEGO, CA 92191-0452
PO BOX 910453, SAN DIEGO, CA 92191-0453
PO BOX 910454, SAN DIEGO, CA 92191-0454
PO BOX 910455, SAN DIEGO, CA 92191-0455
PO BOX 910456, SAN DIEGO, CA 92191-0456
PO BOX 910457, SAN DIEGO, CA 92191-0457
PO BOX 910458, SAN DIEGO, CA 92191-0458
PO BOX 910459, SAN DIEGO, CA 92191-0459
PO BOX 910460, SAN DIEGO, CA 92191-0460
PO BOX 910461, SAN DIEGO, CA 92191-0461
PO BOX 910462, SAN DIEGO, CA 92191-0462
PO BOX 910463, SAN DIEGO, CA 92191-0463
PO BOX 910464, SAN DIEGO, CA 92191-0464
PO BOX 910465, SAN DIEGO, CA 92191-0465
PO BOX 910466, SAN DIEGO, CA 92191-0466
PO BOX 910467, SAN DIEGO, CA 92191-0467
PO BOX 910468, SAN DIEGO, CA 92191-0468
PO BOX 910469, SAN DIEGO, CA 92191-0469
PO BOX 910470, SAN DIEGO, CA 92191-0470
PO BOX 910471, SAN DIEGO, CA 92191-0471
PO BOX 910472, SAN DIEGO, CA 92191-0472
PO BOX 910473, SAN DIEGO, CA 92191-0473
PO BOX 910474, SAN DIEGO, CA 92191-0474
PO BOX 910475, SAN DIEGO, CA 92191-0475
PO BOX 910476, SAN DIEGO, CA 92191-0476
PO BOX 910477, SAN DIEGO, CA 92191-0477
PO BOX 910478, SAN DIEGO, CA 92191-0478
PO BOX 910479, SAN DIEGO, CA 92191-0479
PO BOX 910480, SAN DIEGO, CA 92191-0480
PO BOX 910481, SAN DIEGO, CA 92191-0481
PO BOX 910482, SAN DIEGO, CA 92191-0482
PO BOX 910483, SAN DIEGO, CA 92191-0483
PO BOX 910484, SAN DIEGO, CA 92191-0484
PO BOX 910485, SAN DIEGO, CA 92191-0485
PO BOX 910486, SAN DIEGO, CA 92191-0486
PO BOX 910487, SAN DIEGO, CA 92191-0487
PO BOX 910488, SAN DIEGO, CA 92191-0488
PO BOX 910489, SAN DIEGO, CA 92191-0489
PO BOX 910490, SAN DIEGO, CA 92191-0490
PO BOX 910491, SAN DIEGO, CA 92191-0491
PO BOX 910492, SAN DIEGO, CA 92191-0492
PO BOX 910493, SAN DIEGO, CA 92191-0493
PO BOX 910494, SAN DIEGO, CA 92191-0494
PO BOX 910495, SAN DIEGO, CA 92191-0495
PO BOX 910496, SAN DIEGO, CA 92191-0496
PO BOX 910497, SAN DIEGO, CA 92191-0497
PO BOX 910498, SAN DIEGO, CA 92191-0498
PO BOX 910499, SAN DIEGO, CA 92191-0499
PO BOX 910500, SAN DIEGO, CA 92191-0500
PO BOX 910501, SAN DIEGO, CA 92191-0501
PO BOX 910502, SAN DIEGO, CA 92191-0502
PO BOX 910503, SAN DIEGO, CA 92191-0503
PO BOX 910504, SAN DIEGO, CA 92191-0504
PO BOX 910505, SAN DIEGO, CA 92191-0505
PO BOX 910506, SAN DIEGO, CA 92191-0506
PO BOX 910507, SAN DIEGO, CA 92191-0507
PO BOX 910508, SAN DIEGO, CA 92191-0508
PO BOX 910509, SAN DIEGO, CA 92191-0509
PO BOX 910510, SAN DIEGO, CA 92191-0510
PO BOX 910511, SAN DIEGO, CA 92191-0511
PO BOX 910512, SAN DIEGO, CA 92191-0512
PO BOX 910513, SAN DIEGO, CA 92191-0513
PO BOX 910514, SAN DIEGO, CA 92191-0514
PO BOX 910515, SAN DIEGO, CA 92191-0515
PO BOX 910516, SAN DIEGO, CA 92191-0516
PO BOX 910517, SAN DIEGO, CA 92191-0517
PO BOX 910518, SAN DIEGO, CA 92191-0518
PO BOX 910519, SAN DIEGO, CA 92191-0519
PO BOX 910520, SAN DIEGO, CA 92191-0520
PO BOX 910521, SAN DIEGO, CA 92191-0521
PO BOX 910522, SAN DIEGO, CA 92191-0522
PO BOX 910523, SAN DIEGO, CA 92191-0523
PO BOX 910524, SAN DIEGO, CA 92191-0524
PO BOX 910525, SAN DIEGO, CA 92191-0525
PO BOX 910526, SAN DIEGO, CA 92191-0526
PO BOX 910527, SAN DIEGO, CA 92191-0527
PO BOX 910528, SAN DIEGO, CA 92191-0528
PO BOX 910529, SAN DIEGO, CA 92191-0529
PO BOX 910530, SAN DIEGO, CA 92191-0530
PO BOX 910531, SAN DIEGO, CA 92191-0531
PO BOX 910532, SAN DIEGO, CA 92191-0532
PO BOX 910533, SAN DIEGO, CA 92191-0533
PO BOX 910534, SAN DIEGO, CA 92191-0534
PO BOX 910535, SAN DIEGO, CA 92191-0535
PO BOX 910536, SAN DIEGO, CA 92191-0536
PO BOX 910537, SAN DIEGO, CA 92191-0537
PO BOX 910538, SAN DIEGO, CA 92191-0538
PO BOX 910539, SAN DIEGO, CA 92191-0539
PO BOX 910540, SAN DIEGO, CA 92191-0540
PO BOX 910541, SAN DIEGO, CA 92191-0541
PO BOX 910542, SAN DIEGO, CA 92191-0542
PO BOX 910543, SAN DIEGO, CA 92191-0543
PO BOX 910544, SAN DIEGO, CA 92191-0544
PO BOX 910545, SAN DIEGO, CA 92191-0545
PO BOX 910546, SAN DIEGO, CA 92191-0546
PO BOX 910547, SAN DIEGO, CA 92191-0547
PO BOX 910548, SAN DIEGO, CA 92191-0548
PO BOX 910549, SAN DIEGO, CA 92191-0549
PO BOX 910550, SAN DIEGO, CA 92191-0550
PO BOX 910551, SAN DIEGO, CA 92191-0551
PO BOX 910552, SAN DIEGO, CA 92191-0552
PO BOX 910553, SAN DIEGO, CA 92191-0553
PO BOX 910554, SAN DIEGO, CA 92191-0554
PO BOX 910555, SAN DIEGO, CA 92191-0555
PO BOX 910556, SAN DIEGO, CA 92191-0556
PO BOX 910557, SAN DIEGO, CA 92191-0557
PO BOX 910558, SAN DIEGO, CA 92191-0558
PO BOX 910559, SAN DIEGO, CA 92191-0559
PO BOX 910560, SAN DIEGO, CA 92191-0560
PO BOX 910561, SAN DIEGO, CA 92191-0561
PO BOX 910562, SAN DIEGO, CA 92191-0562
PO BOX 910563, SAN DIEGO, CA 92191-0563
PO BOX 910564, SAN DIEGO, CA 92191-0564
PO BOX 910565, SAN DIEGO, CA 92191-0565
PO BOX 910566, SAN DIEGO, CA 92191-0566
PO BOX 910567, SAN DIEGO, CA 92191-0567
PO BOX 910568, SAN DIEGO, CA 92191-0568
PO BOX 910569, SAN DIEGO, CA 92191-0569
PO BOX 910570, SAN DIEGO, CA 92191-0570
PO BOX 910571, SAN DIEGO, CA 92191-0571
PO BOX 910572, SAN DIEGO, CA 92191-0572
PO BOX 910573, SAN DIEGO, CA 92191-0573
PO BOX 910574, SAN DIEGO, CA 92191-0574
PO BOX 910575, SAN DIEGO, CA 92191-0575
PO BOX 910576, SAN DIEGO, CA 92191-0576
PO BOX 910577, SAN DIEGO, CA 92191-0577
PO BOX 910578, SAN DIEGO, CA 92191-0578
PO BOX 910579, SAN DIEGO, CA 92191-0579
PO BOX 910580, SAN DIEGO, CA 92191-0580
PO BOX 910581, SAN DIEGO, CA 92191-0581
PO BOX 910582, SAN DIEGO, CA 92191-0582
PO BOX 910583, SAN DIEGO, CA 92191-0583
PO BOX 910584, SAN DIEGO, CA 92191-0584
PO BOX 910585, SAN DIEGO, CA 92191-0585
PO BOX 910586, SAN DIEGO, CA 92191-0586
PO BOX 910587, SAN DIEGO, CA 92191-0587
PO BOX 910588, SAN DIEGO, CA 92191-0588
PO BOX 910589, SAN DIEGO, CA 92191-0589
PO BOX 910590, SAN DIEGO, CA 92191-0590
PO BOX 910591, SAN DIEGO, CA 92191-0591
PO BOX 910592, SAN DIEGO, CA 92191-0592
PO BOX 910593, SAN DIEGO, CA 92191-0593
PO BOX 910594, SAN DIEGO, CA 92191-0594
PO BOX 910595, SAN DIEGO, CA 92191-0595
PO BOX 910596, SAN DIEGO, CA 92191-0596
PO BOX 910597, SAN DIEGO, CA 92191-0597
PO BOX 910598, SAN DIEGO, CA 92191-0598
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