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 10361, BLACKSBURG, VA 24062-0361
PO BOX 10362, BLACKSBURG, VA 24062-0362
PO BOX 10363, BLACKSBURG, VA 24062-0363
PO BOX 10364, BLACKSBURG, VA 24062-0364
PO BOX 10365, BLACKSBURG, VA 24062-0365
PO BOX 10366, BLACKSBURG, VA 24062-0366
PO BOX 10367, BLACKSBURG, VA 24062-0367
PO BOX 10368, BLACKSBURG, VA 24062-0368
PO BOX 10369, BLACKSBURG, VA 24062-0369
PO BOX 10370, BLACKSBURG, VA 24062-0370
PO BOX 10371, BLACKSBURG, VA 24062-0371
PO BOX 10372, BLACKSBURG, VA 24062-0372
PO BOX 10373, BLACKSBURG, VA 24062-0373
PO BOX 10374, BLACKSBURG, VA 24062-0374
PO BOX 10375, BLACKSBURG, VA 24062-0375
PO BOX 10376, BLACKSBURG, VA 24062-0376
PO BOX 10377, BLACKSBURG, VA 24062-0377
PO BOX 10378, BLACKSBURG, VA 24062-0378
PO BOX 10379, BLACKSBURG, VA 24062-0379
PO BOX 10380, BLACKSBURG, VA 24062-0380
PO BOX 10381, BLACKSBURG, VA 24062-0381
PO BOX 10382, BLACKSBURG, VA 24062-0382
PO BOX 10383, BLACKSBURG, VA 24062-0383
PO BOX 10384, BLACKSBURG, VA 24062-0384
PO BOX 10385, BLACKSBURG, VA 24062-0385
PO BOX 10386, BLACKSBURG, VA 24062-0386
PO BOX 10387, BLACKSBURG, VA 24062-0387
PO BOX 10388, BLACKSBURG, VA 24062-0388
PO BOX 10389, BLACKSBURG, VA 24062-0389
PO BOX 10390, BLACKSBURG, VA 24062-0390
PO BOX 10391, BLACKSBURG, VA 24062-0391
PO BOX 10392, BLACKSBURG, VA 24062-0392
PO BOX 10393, BLACKSBURG, VA 24062-0393
PO BOX 10394, BLACKSBURG, VA 24062-0394
PO BOX 10395, BLACKSBURG, VA 24062-0395
PO BOX 10396, BLACKSBURG, VA 24062-0396
PO BOX 10397, BLACKSBURG, VA 24062-0397
PO BOX 10398, BLACKSBURG, VA 24062-0398
PO BOX 10399, BLACKSBURG, VA 24062-0399
PO BOX 10400, BLACKSBURG, VA 24062-0400
PO BOX 10401, BLACKSBURG, VA 24062-0401
PO BOX 10402, BLACKSBURG, VA 24062-0402
PO BOX 10403, BLACKSBURG, VA 24062-0403
PO BOX 10404, BLACKSBURG, VA 24062-0404
PO BOX 10405, BLACKSBURG, VA 24062-0405
PO BOX 10406, BLACKSBURG, VA 24062-0406
PO BOX 10407, BLACKSBURG, VA 24062-0407
PO BOX 10408, BLACKSBURG, VA 24062-0408
PO BOX 10409, BLACKSBURG, VA 24062-0409
PO BOX 10410, BLACKSBURG, VA 24062-0410
PO BOX 10411, BLACKSBURG, VA 24062-0411
PO BOX 10412, BLACKSBURG, VA 24062-0412
PO BOX 10413, BLACKSBURG, VA 24062-0413
PO BOX 10414, BLACKSBURG, VA 24062-0414
PO BOX 10415, BLACKSBURG, VA 24062-0415
PO BOX 10416, BLACKSBURG, VA 24062-0416
PO BOX 10417, BLACKSBURG, VA 24062-0417
PO BOX 10418, BLACKSBURG, VA 24062-0418
PO BOX 10419, BLACKSBURG, VA 24062-0419
PO BOX 10420, BLACKSBURG, VA 24062-0420
PO BOX 10421, BLACKSBURG, VA 24062-0421
PO BOX 10422, BLACKSBURG, VA 24062-0422
PO BOX 10423, BLACKSBURG, VA 24062-0423
PO BOX 10424, BLACKSBURG, VA 24062-0424
PO BOX 10425, BLACKSBURG, VA 24062-0425
PO BOX 10426, BLACKSBURG, VA 24062-0426
PO BOX 10427, BLACKSBURG, VA 24062-0427
PO BOX 10428, BLACKSBURG, VA 24062-0428
PO BOX 10429, BLACKSBURG, VA 24062-0429
PO BOX 10430, BLACKSBURG, VA 24062-0430
PO BOX 10431, BLACKSBURG, VA 24062-0431
PO BOX 10432, BLACKSBURG, VA 24062-0432
PO BOX 10433, BLACKSBURG, VA 24062-0433
PO BOX 10434, BLACKSBURG, VA 24062-0434
PO BOX 10435, BLACKSBURG, VA 24062-0435
PO BOX 10436, BLACKSBURG, VA 24062-0436
PO BOX 10437, BLACKSBURG, VA 24062-0437
PO BOX 10438, BLACKSBURG, VA 24062-0438
PO BOX 10439, BLACKSBURG, VA 24062-0439
PO BOX 10440, BLACKSBURG, VA 24062-0440
PO BOX 10441, BLACKSBURG, VA 24062-0441
PO BOX 10442, BLACKSBURG, VA 24062-0442
PO BOX 10443, BLACKSBURG, VA 24062-0443
PO BOX 10444, BLACKSBURG, VA 24062-0444
PO BOX 10445, BLACKSBURG, VA 24062-0445
PO BOX 10446, BLACKSBURG, VA 24062-0446
PO BOX 10447, BLACKSBURG, VA 24062-0447
PO BOX 10448, BLACKSBURG, VA 24062-0448
PO BOX 10449, BLACKSBURG, VA 24062-0449
PO BOX 10450, BLACKSBURG, VA 24062-0450
PO BOX 10451, BLACKSBURG, VA 24062-0451
PO BOX 10452, BLACKSBURG, VA 24062-0452
PO BOX 10453, BLACKSBURG, VA 24062-0453
PO BOX 10454, BLACKSBURG, VA 24062-0454
PO BOX 10455, BLACKSBURG, VA 24062-0455
PO BOX 10456, BLACKSBURG, VA 24062-0456
PO BOX 10457, BLACKSBURG, VA 24062-0457
PO BOX 10458, BLACKSBURG, VA 24062-0458
PO BOX 10459, BLACKSBURG, VA 24062-0459
PO BOX 10460, BLACKSBURG, VA 24062-0460
PO BOX 10461, BLACKSBURG, VA 24062-0461
PO BOX 10462, BLACKSBURG, VA 24062-0462
PO BOX 10463, BLACKSBURG, VA 24062-0463
PO BOX 10464, BLACKSBURG, VA 24062-0464
PO BOX 10465, BLACKSBURG, VA 24062-0465
PO BOX 10466, BLACKSBURG, VA 24062-0466
PO BOX 10467, BLACKSBURG, VA 24062-0467
PO BOX 10468, BLACKSBURG, VA 24062-0468
PO BOX 10469, BLACKSBURG, VA 24062-0469
PO BOX 10470, BLACKSBURG, VA 24062-0470
PO BOX 10471, BLACKSBURG, VA 24062-0471
PO BOX 10472, BLACKSBURG, VA 24062-0472
PO BOX 10473, BLACKSBURG, VA 24062-0473
PO BOX 10474, BLACKSBURG, VA 24062-0474
PO BOX 10475, BLACKSBURG, VA 24062-0475
PO BOX 10476, BLACKSBURG, VA 24062-0476
PO BOX 10477, BLACKSBURG, VA 24062-0477
PO BOX 10478, BLACKSBURG, VA 24062-0478
PO BOX 10479, BLACKSBURG, VA 24062-0479
PO BOX 10480, BLACKSBURG, VA 24062-0480
PO BOX 10481, BLACKSBURG, VA 24062-0481
PO BOX 10482, BLACKSBURG, VA 24062-0482
PO BOX 10483, BLACKSBURG, VA 24062-0483
PO BOX 10484, BLACKSBURG, VA 24062-0484
PO BOX 10485, BLACKSBURG, VA 24062-0485
PO BOX 10486, BLACKSBURG, VA 24062-0486
PO BOX 10487, BLACKSBURG, VA 24062-0487
PO BOX 10488, BLACKSBURG, VA 24062-0488
PO BOX 10489, BLACKSBURG, VA 24062-0489
PO BOX 10490, BLACKSBURG, VA 24062-0490
PO BOX 10491, BLACKSBURG, VA 24062-0491
PO BOX 10492, BLACKSBURG, VA 24062-0492
PO BOX 10493, BLACKSBURG, VA 24062-0493
PO BOX 10494, BLACKSBURG, VA 24062-0494
PO BOX 10495, BLACKSBURG, VA 24062-0495
PO BOX 10496, BLACKSBURG, VA 24062-0496
PO BOX 10497, BLACKSBURG, VA 24062-0497
PO BOX 10498, BLACKSBURG, VA 24062-0498
PO BOX 10499, BLACKSBURG, VA 24062-0499
PO BOX 10500, BLACKSBURG, VA 24062-0500
PO BOX 10501, BLACKSBURG, VA 24062-0501
PO BOX 10502, BLACKSBURG, VA 24062-0502
PO BOX 10503, BLACKSBURG, VA 24062-0503
PO BOX 10504, BLACKSBURG, VA 24062-0504
PO BOX 10505, BLACKSBURG, VA 24062-0505
PO BOX 10506, BLACKSBURG, VA 24062-0506
PO BOX 10507, BLACKSBURG, VA 24062-0507
PO BOX 10508, BLACKSBURG, VA 24062-0508
PO BOX 10509, BLACKSBURG, VA 24062-0509
PO BOX 10510, BLACKSBURG, VA 24062-0510
PO BOX 10511, BLACKSBURG, VA 24062-0511
PO BOX 10512, BLACKSBURG, VA 24062-0512
PO BOX 10513, BLACKSBURG, VA 24062-0513
PO BOX 10514, BLACKSBURG, VA 24062-0514
PO BOX 10515, BLACKSBURG, VA 24062-0515
PO BOX 10516, BLACKSBURG, VA 24062-0516
PO BOX 10517, BLACKSBURG, VA 24062-0517
PO BOX 10518, BLACKSBURG, VA 24062-0518
PO BOX 10519, BLACKSBURG, VA 24062-0519
PO BOX 10520, BLACKSBURG, VA 24062-0520
PO BOX 10521, BLACKSBURG, VA 24062-0521
PO BOX 10522, BLACKSBURG, VA 24062-0522
PO BOX 10523, BLACKSBURG, VA 24062-0523
PO BOX 10524, BLACKSBURG, VA 24062-0524
PO BOX 10525, BLACKSBURG, VA 24062-0525
PO BOX 10526, BLACKSBURG, VA 24062-0526
PO BOX 10527, BLACKSBURG, VA 24062-0527
PO BOX 10528, BLACKSBURG, VA 24062-0528
PO BOX 10529, BLACKSBURG, VA 24062-0529
PO BOX 10530, BLACKSBURG, VA 24062-0530
PO BOX 10531, BLACKSBURG, VA 24062-0531
PO BOX 10532, BLACKSBURG, VA 24062-0532
PO BOX 10533, BLACKSBURG, VA 24062-0533
PO BOX 10534, BLACKSBURG, VA 24062-0534
PO BOX 10535, BLACKSBURG, VA 24062-0535
PO BOX 10536, BLACKSBURG, VA 24062-0536
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