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 28361, SAN DIEGO, CA 92198-0361
PO BOX 28362, SAN DIEGO, CA 92198-0362
PO BOX 28363, SAN DIEGO, CA 92198-0363
PO BOX 28364, SAN DIEGO, CA 92198-0364
PO BOX 28365, SAN DIEGO, CA 92198-0365
PO BOX 28366, SAN DIEGO, CA 92198-0366
PO BOX 28367, SAN DIEGO, CA 92198-0367
PO BOX 28368, SAN DIEGO, CA 92198-0368
PO BOX 28369, SAN DIEGO, CA 92198-0369
PO BOX 28370, SAN DIEGO, CA 92198-0370
PO BOX 28371, SAN DIEGO, CA 92198-0371
PO BOX 28372, SAN DIEGO, CA 92198-0372
PO BOX 28373, SAN DIEGO, CA 92198-0373
PO BOX 28374, SAN DIEGO, CA 92198-0374
PO BOX 28375, SAN DIEGO, CA 92198-0375
PO BOX 28376, SAN DIEGO, CA 92198-0376
PO BOX 28377, SAN DIEGO, CA 92198-0377
PO BOX 28378, SAN DIEGO, CA 92198-0378
PO BOX 28379, SAN DIEGO, CA 92198-0379
PO BOX 28380, SAN DIEGO, CA 92198-0380
PO BOX 28381, SAN DIEGO, CA 92198-0381
PO BOX 28382, SAN DIEGO, CA 92198-0382
PO BOX 28383, SAN DIEGO, CA 92198-0383
PO BOX 28384, SAN DIEGO, CA 92198-0384
PO BOX 28385, SAN DIEGO, CA 92198-0385
PO BOX 28386, SAN DIEGO, CA 92198-0386
PO BOX 28387, SAN DIEGO, CA 92198-0387
PO BOX 28388, SAN DIEGO, CA 92198-0388
PO BOX 28389, SAN DIEGO, CA 92198-0389
PO BOX 28390, SAN DIEGO, CA 92198-0390
PO BOX 28391, SAN DIEGO, CA 92198-0391
PO BOX 28392, SAN DIEGO, CA 92198-0392
PO BOX 28393, SAN DIEGO, CA 92198-0393
PO BOX 28394, SAN DIEGO, CA 92198-0394
PO BOX 28395, SAN DIEGO, CA 92198-0395
PO BOX 28396, SAN DIEGO, CA 92198-0396
PO BOX 28397, SAN DIEGO, CA 92198-0397
PO BOX 28398, SAN DIEGO, CA 92198-0398
PO BOX 28399, SAN DIEGO, CA 92198-0399
PO BOX 28400, SAN DIEGO, CA 92198-0400
PO BOX 28401, SAN DIEGO, CA 92198-0401
PO BOX 28402, SAN DIEGO, CA 92198-0402
PO BOX 28403, SAN DIEGO, CA 92198-0403
PO BOX 28404, SAN DIEGO, CA 92198-0404
PO BOX 28405, SAN DIEGO, CA 92198-0405
PO BOX 28406, SAN DIEGO, CA 92198-0406
PO BOX 28407, SAN DIEGO, CA 92198-0407
PO BOX 28408, SAN DIEGO, CA 92198-0408
PO BOX 28409, SAN DIEGO, CA 92198-0409
PO BOX 28410, SAN DIEGO, CA 92198-0410
PO BOX 28411, SAN DIEGO, CA 92198-0411
PO BOX 28412, SAN DIEGO, CA 92198-0412
PO BOX 28413, SAN DIEGO, CA 92198-0413
PO BOX 28414, SAN DIEGO, CA 92198-0414
PO BOX 28415, SAN DIEGO, CA 92198-0415
PO BOX 28416, SAN DIEGO, CA 92198-0416
PO BOX 28417, SAN DIEGO, CA 92198-0417
PO BOX 28418, SAN DIEGO, CA 92198-0418
PO BOX 28419, SAN DIEGO, CA 92198-0419
PO BOX 28420, SAN DIEGO, CA 92198-0420
PO BOX 28421, SAN DIEGO, CA 92198-0421
PO BOX 28422, SAN DIEGO, CA 92198-0422
PO BOX 28423, SAN DIEGO, CA 92198-0423
PO BOX 28424, SAN DIEGO, CA 92198-0424
PO BOX 28425, SAN DIEGO, CA 92198-0425
PO BOX 28426, SAN DIEGO, CA 92198-0426
PO BOX 28427, SAN DIEGO, CA 92198-0427
PO BOX 28428, SAN DIEGO, CA 92198-0428
PO BOX 28429, SAN DIEGO, CA 92198-0429
PO BOX 28430, SAN DIEGO, CA 92198-0430
PO BOX 28431, SAN DIEGO, CA 92198-0431
PO BOX 28432, SAN DIEGO, CA 92198-0432
PO BOX 28433, SAN DIEGO, CA 92198-0433
PO BOX 28434, SAN DIEGO, CA 92198-0434
PO BOX 28435, SAN DIEGO, CA 92198-0435
PO BOX 28436, SAN DIEGO, CA 92198-0436
PO BOX 28437, SAN DIEGO, CA 92198-0437
PO BOX 28438, SAN DIEGO, CA 92198-0438
PO BOX 28439, SAN DIEGO, CA 92198-0439
PO BOX 28440, SAN DIEGO, CA 92198-0440
PO BOX 28441, SAN DIEGO, CA 92198-0441
PO BOX 28442, SAN DIEGO, CA 92198-0442
PO BOX 28443, SAN DIEGO, CA 92198-0443
PO BOX 28444, SAN DIEGO, CA 92198-0444
PO BOX 28445, SAN DIEGO, CA 92198-0445
PO BOX 28446, SAN DIEGO, CA 92198-0446
PO BOX 28447, SAN DIEGO, CA 92198-0447
PO BOX 28448, SAN DIEGO, CA 92198-0448
PO BOX 28449, SAN DIEGO, CA 92198-0449
PO BOX 28450, SAN DIEGO, CA 92198-0450
PO BOX 28451, SAN DIEGO, CA 92198-0451
PO BOX 28452, SAN DIEGO, CA 92198-0452
PO BOX 28453, SAN DIEGO, CA 92198-0453
PO BOX 28454, SAN DIEGO, CA 92198-0454
PO BOX 28455, SAN DIEGO, CA 92198-0455
PO BOX 28456, SAN DIEGO, CA 92198-0456
PO BOX 28457, SAN DIEGO, CA 92198-0457
PO BOX 28458, SAN DIEGO, CA 92198-0458
PO BOX 28459, SAN DIEGO, CA 92198-0459
PO BOX 28460, SAN DIEGO, CA 92198-0460
PO BOX 28461, SAN DIEGO, CA 92198-0461
PO BOX 28462, SAN DIEGO, CA 92198-0462
PO BOX 28463, SAN DIEGO, CA 92198-0463
PO BOX 28464, SAN DIEGO, CA 92198-0464
PO BOX 28465, SAN DIEGO, CA 92198-0465
PO BOX 28466, SAN DIEGO, CA 92198-0466
PO BOX 28467, SAN DIEGO, CA 92198-0467
PO BOX 28468, SAN DIEGO, CA 92198-0468
PO BOX 28469, SAN DIEGO, CA 92198-0469
PO BOX 28470, SAN DIEGO, CA 92198-0470
PO BOX 28471, SAN DIEGO, CA 92198-0471
PO BOX 28472, SAN DIEGO, CA 92198-0472
PO BOX 28473, SAN DIEGO, CA 92198-0473
PO BOX 28474, SAN DIEGO, CA 92198-0474
PO BOX 28475, SAN DIEGO, CA 92198-0475
PO BOX 28476, SAN DIEGO, CA 92198-0476
PO BOX 28477, SAN DIEGO, CA 92198-0477
PO BOX 28478, SAN DIEGO, CA 92198-0478
PO BOX 28479, SAN DIEGO, CA 92198-0479
PO BOX 28480, SAN DIEGO, CA 92198-0480
PO BOX 28481, SAN DIEGO, CA 92198-0481
PO BOX 28482, SAN DIEGO, CA 92198-0482
PO BOX 28483, SAN DIEGO, CA 92198-0483
PO BOX 28484, SAN DIEGO, CA 92198-0484
PO BOX 28485, SAN DIEGO, CA 92198-0485
PO BOX 28486, SAN DIEGO, CA 92198-0486
PO BOX 28487, SAN DIEGO, CA 92198-0487
PO BOX 28488, SAN DIEGO, CA 92198-0488
PO BOX 28489, SAN DIEGO, CA 92198-0489
PO BOX 28490, SAN DIEGO, CA 92198-0490
PO BOX 28491, SAN DIEGO, CA 92198-0491
PO BOX 28492, SAN DIEGO, CA 92198-0492
PO BOX 28493, SAN DIEGO, CA 92198-0493
PO BOX 28494, SAN DIEGO, CA 92198-0494
PO BOX 28495, SAN DIEGO, CA 92198-0495
PO BOX 28496, SAN DIEGO, CA 92198-0496
PO BOX 28497, SAN DIEGO, CA 92198-0497
PO BOX 28498, SAN DIEGO, CA 92198-0498
PO BOX 28499, SAN DIEGO, CA 92198-0499
PO BOX 28500, SAN DIEGO, CA 92198-0500
PO BOX 28501, SAN DIEGO, CA 92198-0501
PO BOX 28502, SAN DIEGO, CA 92198-0502
PO BOX 28503, SAN DIEGO, CA 92198-0503
PO BOX 28504, SAN DIEGO, CA 92198-0504
PO BOX 28505, SAN DIEGO, CA 92198-0505
PO BOX 28506, SAN DIEGO, CA 92198-0506
PO BOX 28507, SAN DIEGO, CA 92198-0507
PO BOX 28508, SAN DIEGO, CA 92198-0508
PO BOX 28509, SAN DIEGO, CA 92198-0509
PO BOX 28510, SAN DIEGO, CA 92198-0510
PO BOX 28511, SAN DIEGO, CA 92198-0511
PO BOX 28512, SAN DIEGO, CA 92198-0512
PO BOX 28513, SAN DIEGO, CA 92198-0513
PO BOX 28514, SAN DIEGO, CA 92198-0514
PO BOX 28515, SAN DIEGO, CA 92198-0515
PO BOX 28516, SAN DIEGO, CA 92198-0516
PO BOX 28517, SAN DIEGO, CA 92198-0517
PO BOX 28518, SAN DIEGO, CA 92198-0518
PO BOX 28519, SAN DIEGO, CA 92198-0519
PO BOX 28520, SAN DIEGO, CA 92198-0520
PO BOX 28521, SAN DIEGO, CA 92198-0521
PO BOX 28522, SAN DIEGO, CA 92198-0522
PO BOX 28523, SAN DIEGO, CA 92198-0523
PO BOX 28524, SAN DIEGO, CA 92198-0524
PO BOX 28525, SAN DIEGO, CA 92198-0525
PO BOX 28526, SAN DIEGO, CA 92198-0526
PO BOX 28527, SAN DIEGO, CA 92198-0527
PO BOX 28528, SAN DIEGO, CA 92198-0528
PO BOX 28529, SAN DIEGO, CA 92198-0529
PO BOX 28530, SAN DIEGO, CA 92198-0530
PO BOX 28531, SAN DIEGO, CA 92198-0531
PO BOX 28532, SAN DIEGO, CA 92198-0532
PO BOX 28533, SAN DIEGO, CA 92198-0533
PO BOX 28534, SAN DIEGO, CA 92198-0534
PO BOX 28535, SAN DIEGO, CA 92198-0535
PO BOX 28536, SAN DIEGO, CA 92198-0536
PO BOX 28537, SAN DIEGO, CA 92198-0537
PO BOX 28538, SAN DIEGO, CA 92198-0538
PO BOX 28539, SAN DIEGO, CA 92198-0539
PO BOX 28540, SAN DIEGO, CA 92198-0540
PO BOX 28541, SAN DIEGO, CA 92198-0541
PO BOX 28542, SAN DIEGO, CA 92198-0542
PO BOX 28543, SAN DIEGO, CA 92198-0543
PO BOX 28544, SAN DIEGO, CA 92198-0544
PO BOX 28545, SAN DIEGO, CA 92198-0545
PO BOX 28546, SAN DIEGO, CA 92198-0546
PO BOX 28547, SAN DIEGO, CA 92198-0547
PO BOX 28548, SAN DIEGO, CA 92198-0548
PO BOX 28549, SAN DIEGO, CA 92198-0549
PO BOX 28550, SAN DIEGO, CA 92198-0550
PO BOX 28551, SAN DIEGO, CA 92198-0551
PO BOX 28552, SAN DIEGO, CA 92198-0552
PO BOX 28553, SAN DIEGO, CA 92198-0553
PO BOX 28554, SAN DIEGO, CA 92198-0554
PO BOX 28555, SAN DIEGO, CA 92198-0555
PO BOX 28556, SAN DIEGO, CA 92198-0556
PO BOX 28557, SAN DIEGO, CA 92198-0557
PO BOX 28558, SAN DIEGO, CA 92198-0558
PO BOX 28559, SAN DIEGO, CA 92198-0559
PO BOX 28560, SAN DIEGO, CA 92198-0560
PO BOX 28561, SAN DIEGO, CA 92198-0561
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