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 370411, SAN DIEGO, CA 92137-0411
PO BOX 370412, SAN DIEGO, CA 92137-0412
PO BOX 370413, SAN DIEGO, CA 92137-0413
PO BOX 370414, SAN DIEGO, CA 92137-0414
PO BOX 370415, SAN DIEGO, CA 92137-0415
PO BOX 370416, SAN DIEGO, CA 92137-0416
PO BOX 370417, SAN DIEGO, CA 92137-0417
PO BOX 370418, SAN DIEGO, CA 92137-0418
PO BOX 370419, SAN DIEGO, CA 92137-0419
PO BOX 370420, SAN DIEGO, CA 92137-0420
PO BOX 370421, SAN DIEGO, CA 92137-0421
PO BOX 370422, SAN DIEGO, CA 92137-0422
PO BOX 370423, SAN DIEGO, CA 92137-0423
PO BOX 370424, SAN DIEGO, CA 92137-0424
PO BOX 370425, SAN DIEGO, CA 92137-0425
PO BOX 370426, SAN DIEGO, CA 92137-0426
PO BOX 370427, SAN DIEGO, CA 92137-0427
PO BOX 370428, SAN DIEGO, CA 92137-0428
PO BOX 370429, SAN DIEGO, CA 92137-0429
PO BOX 370430, SAN DIEGO, CA 92137-0430
PO BOX 370431, SAN DIEGO, CA 92137-0431
PO BOX 370432, SAN DIEGO, CA 92137-0432
PO BOX 370433, SAN DIEGO, CA 92137-0433
PO BOX 370434, SAN DIEGO, CA 92137-0434
PO BOX 370435, SAN DIEGO, CA 92137-0435
PO BOX 370436, SAN DIEGO, CA 92137-0436
PO BOX 370437, SAN DIEGO, CA 92137-0437
PO BOX 370438, SAN DIEGO, CA 92137-0438
PO BOX 370439, SAN DIEGO, CA 92137-0439
PO BOX 370440, SAN DIEGO, CA 92137-0440
PO BOX 370441, SAN DIEGO, CA 92137-0441
PO BOX 370442, SAN DIEGO, CA 92137-0442
PO BOX 370443, SAN DIEGO, CA 92137-0443
PO BOX 370444, SAN DIEGO, CA 92137-0444
PO BOX 370445, SAN DIEGO, CA 92137-0445
PO BOX 370446, SAN DIEGO, CA 92137-0446
PO BOX 370447, SAN DIEGO, CA 92137-0447
PO BOX 370448, SAN DIEGO, CA 92137-0448
PO BOX 370449, SAN DIEGO, CA 92137-0449
PO BOX 370450, SAN DIEGO, CA 92137-0450
PO BOX 370451, SAN DIEGO, CA 92137-0451
PO BOX 370452, SAN DIEGO, CA 92137-0452
PO BOX 370453, SAN DIEGO, CA 92137-0453
PO BOX 370454, SAN DIEGO, CA 92137-0454
PO BOX 370455, SAN DIEGO, CA 92137-0455
PO BOX 370456, SAN DIEGO, CA 92137-0456
PO BOX 370457, SAN DIEGO, CA 92137-0457
PO BOX 370458, SAN DIEGO, CA 92137-0458
PO BOX 370459, SAN DIEGO, CA 92137-0459
PO BOX 370460, SAN DIEGO, CA 92137-0460
PO BOX 370461, SAN DIEGO, CA 92137-0461
PO BOX 370462, SAN DIEGO, CA 92137-0462
PO BOX 370463, SAN DIEGO, CA 92137-0463
PO BOX 370464, SAN DIEGO, CA 92137-0464
PO BOX 370465, SAN DIEGO, CA 92137-0465
PO BOX 370466, SAN DIEGO, CA 92137-0466
PO BOX 370467, SAN DIEGO, CA 92137-0467
PO BOX 370468, SAN DIEGO, CA 92137-0468
PO BOX 370469, SAN DIEGO, CA 92137-0469
PO BOX 370470, SAN DIEGO, CA 92137-0470
PO BOX 370471, SAN DIEGO, CA 92137-0471
PO BOX 370472, SAN DIEGO, CA 92137-0472
PO BOX 370473, SAN DIEGO, CA 92137-0473
PO BOX 370474, SAN DIEGO, CA 92137-0474
PO BOX 370475, SAN DIEGO, CA 92137-0475
PO BOX 370476, SAN DIEGO, CA 92137-0476
PO BOX 370477, SAN DIEGO, CA 92137-0477
PO BOX 370478, SAN DIEGO, CA 92137-0478
PO BOX 370479, SAN DIEGO, CA 92137-0479
PO BOX 370480, SAN DIEGO, CA 92137-0480
PO BOX 370481, SAN DIEGO, CA 92137-0481
PO BOX 370482, SAN DIEGO, CA 92137-0482
PO BOX 370483, SAN DIEGO, CA 92137-0483
PO BOX 370484, SAN DIEGO, CA 92137-0484
PO BOX 370485, SAN DIEGO, CA 92137-0485
PO BOX 370486, SAN DIEGO, CA 92137-0486
PO BOX 370487, SAN DIEGO, CA 92137-0487
PO BOX 370488, SAN DIEGO, CA 92137-0488
PO BOX 370489, SAN DIEGO, CA 92137-0489
PO BOX 370490, SAN DIEGO, CA 92137-0490
PO BOX 370491, SAN DIEGO, CA 92137-0491
PO BOX 370492, SAN DIEGO, CA 92137-0492
PO BOX 370493, SAN DIEGO, CA 92137-0493
PO BOX 370494, SAN DIEGO, CA 92137-0494
PO BOX 370495, SAN DIEGO, CA 92137-0495
PO BOX 370496, SAN DIEGO, CA 92137-0496
PO BOX 370497, SAN DIEGO, CA 92137-0497
PO BOX 370498, SAN DIEGO, CA 92137-0498
PO BOX 370499, SAN DIEGO, CA 92137-0499
PO BOX 370500, SAN DIEGO, CA 92137-0500
PO BOX 370501, SAN DIEGO, CA 92137-0501
PO BOX 370502, SAN DIEGO, CA 92137-0502
PO BOX 370503, SAN DIEGO, CA 92137-0503
PO BOX 370504, SAN DIEGO, CA 92137-0504
PO BOX 370505, SAN DIEGO, CA 92137-0505
PO BOX 370506, SAN DIEGO, CA 92137-0506
PO BOX 370507, SAN DIEGO, CA 92137-0507
PO BOX 370508, SAN DIEGO, CA 92137-0508
PO BOX 370509, SAN DIEGO, CA 92137-0509
PO BOX 370510, SAN DIEGO, CA 92137-0510
PO BOX 370511, SAN DIEGO, CA 92137-0511
PO BOX 370512, SAN DIEGO, CA 92137-0512
PO BOX 370513, SAN DIEGO, CA 92137-0513
PO BOX 370514, SAN DIEGO, CA 92137-0514
PO BOX 370515, SAN DIEGO, CA 92137-0515
PO BOX 370516, SAN DIEGO, CA 92137-0516
PO BOX 370517, SAN DIEGO, CA 92137-0517
PO BOX 370518, SAN DIEGO, CA 92137-0518
PO BOX 370519, SAN DIEGO, CA 92137-0519
PO BOX 370520, SAN DIEGO, CA 92137-0520
PO BOX 370521, SAN DIEGO, CA 92137-0521
PO BOX 370522, SAN DIEGO, CA 92137-0522
PO BOX 370523, SAN DIEGO, CA 92137-0523
PO BOX 370524, SAN DIEGO, CA 92137-0524
PO BOX 370525, SAN DIEGO, CA 92137-0525
PO BOX 370526, SAN DIEGO, CA 92137-0526
PO BOX 370527, SAN DIEGO, CA 92137-0527
PO BOX 370528, SAN DIEGO, CA 92137-0528
PO BOX 370529, SAN DIEGO, CA 92137-0529
PO BOX 370530, SAN DIEGO, CA 92137-0530
PO BOX 370531, SAN DIEGO, CA 92137-0531
PO BOX 370532, SAN DIEGO, CA 92137-0532
PO BOX 370533, SAN DIEGO, CA 92137-0533
PO BOX 370534, SAN DIEGO, CA 92137-0534
PO BOX 370535, SAN DIEGO, CA 92137-0535
PO BOX 370536, SAN DIEGO, CA 92137-0536
PO BOX 370537, SAN DIEGO, CA 92137-0537
PO BOX 370538, SAN DIEGO, CA 92137-0538
PO BOX 370539, SAN DIEGO, CA 92137-0539
PO BOX 370540, SAN DIEGO, CA 92137-0540
PO BOX 370541, SAN DIEGO, CA 92137-0541
PO BOX 370542, SAN DIEGO, CA 92137-0542
PO BOX 370543, SAN DIEGO, CA 92137-0543
PO BOX 370544, SAN DIEGO, CA 92137-0544
PO BOX 370545, SAN DIEGO, CA 92137-0545
PO BOX 370546, SAN DIEGO, CA 92137-0546
PO BOX 370547, SAN DIEGO, CA 92137-0547
PO BOX 370548, SAN DIEGO, CA 92137-0548
PO BOX 370549, SAN DIEGO, CA 92137-0549
PO BOX 370550, SAN DIEGO, CA 92137-0550
PO BOX 370551, SAN DIEGO, CA 92137-0551
PO BOX 370552, SAN DIEGO, CA 92137-0552
PO BOX 370553, SAN DIEGO, CA 92137-0553
PO BOX 370554, SAN DIEGO, CA 92137-0554
PO BOX 370555, SAN DIEGO, CA 92137-0555
PO BOX 370556, SAN DIEGO, CA 92137-0556
PO BOX 370557, SAN DIEGO, CA 92137-0557
PO BOX 370558, SAN DIEGO, CA 92137-0558
PO BOX 370559, SAN DIEGO, CA 92137-0559
PO BOX 370560, SAN DIEGO, CA 92137-0560
PO BOX 370561, SAN DIEGO, CA 92137-0561
PO BOX 370562, SAN DIEGO, CA 92137-0562
PO BOX 370563, SAN DIEGO, CA 92137-0563
PO BOX 370564, SAN DIEGO, CA 92137-0564
PO BOX 370565, SAN DIEGO, CA 92137-0565
PO BOX 370566, SAN DIEGO, CA 92137-0566
PO BOX 370567, SAN DIEGO, CA 92137-0567
PO BOX 370568, SAN DIEGO, CA 92137-0568
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