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 23461, BALTIMORE, MD 21203-5461
PO BOX 23462, BALTIMORE, MD 21203-5462
PO BOX 23463, BALTIMORE, MD 21203-5463
PO BOX 23464, BALTIMORE, MD 21203-5464
PO BOX 23465, BALTIMORE, MD 21203-5465
PO BOX 23466, BALTIMORE, MD 21203-5466
PO BOX 23467, BALTIMORE, MD 21203-5467
PO BOX 23468, BALTIMORE, MD 21203-5468
PO BOX 23469, BALTIMORE, MD 21203-5469
PO BOX 23470, BALTIMORE, MD 21203-5470
PO BOX 23471, BALTIMORE, MD 21203-5471
PO BOX 23472, BALTIMORE, MD 21203-5472
PO BOX 23473, BALTIMORE, MD 21203-5473
PO BOX 23474, BALTIMORE, MD 21203-5474
PO BOX 23475, BALTIMORE, MD 21203-5475
PO BOX 23476, BALTIMORE, MD 21203-5476
PO BOX 23477, BALTIMORE, MD 21203-5477
PO BOX 23478, BALTIMORE, MD 21203-5478
PO BOX 23479, BALTIMORE, MD 21203-5479
PO BOX 23480, BALTIMORE, MD 21203-5480
PO BOX 23481, BALTIMORE, MD 21203-5481
PO BOX 23482, BALTIMORE, MD 21203-5482
PO BOX 23483, BALTIMORE, MD 21203-5483
PO BOX 23484, BALTIMORE, MD 21203-5484
PO BOX 23485, BALTIMORE, MD 21203-5485
PO BOX 23486, BALTIMORE, MD 21203-5486
PO BOX 23487, BALTIMORE, MD 21203-5487
PO BOX 23488, BALTIMORE, MD 21203-5488
PO BOX 23489, BALTIMORE, MD 21203-5489
PO BOX 23490, BALTIMORE, MD 21203-5490
PO BOX 23491, BALTIMORE, MD 21203-5491
PO BOX 23492, BALTIMORE, MD 21203-5492
PO BOX 23493, BALTIMORE, MD 21203-5493
PO BOX 23494, BALTIMORE, MD 21203-5494
PO BOX 23495, BALTIMORE, MD 21203-5495
PO BOX 23496, BALTIMORE, MD 21203-5496
PO BOX 23497, BALTIMORE, MD 21203-5497
PO BOX 23498, BALTIMORE, MD 21203-5498
PO BOX 23499, BALTIMORE, MD 21203-5499
PO BOX 23500, BALTIMORE, MD 21203-5500
PO BOX 23501, BALTIMORE, MD 21203-5501
PO BOX 23502, BALTIMORE, MD 21203-5502
PO BOX 23503, BALTIMORE, MD 21203-5503
PO BOX 23504, BALTIMORE, MD 21203-5504
PO BOX 23505, BALTIMORE, MD 21203-5505
PO BOX 23506, BALTIMORE, MD 21203-5506
PO BOX 23507, BALTIMORE, MD 21203-5507
PO BOX 23508, BALTIMORE, MD 21203-5508
PO BOX 23509, BALTIMORE, MD 21203-5509
PO BOX 23510, BALTIMORE, MD 21203-5510
PO BOX 23511, BALTIMORE, MD 21203-5511
PO BOX 23512, BALTIMORE, MD 21203-5512
PO BOX 23513, BALTIMORE, MD 21203-5513
PO BOX 23514, BALTIMORE, MD 21203-5514
PO BOX 23515, BALTIMORE, MD 21203-5515
PO BOX 23516, BALTIMORE, MD 21203-5516
PO BOX 23517, BALTIMORE, MD 21203-5517
PO BOX 23518, BALTIMORE, MD 21203-5518
PO BOX 23519, BALTIMORE, MD 21203-5519
PO BOX 23520, BALTIMORE, MD 21203-5520
PO BOX 23521, BALTIMORE, MD 21203-5521
PO BOX 23522, BALTIMORE, MD 21203-5522
PO BOX 23523, BALTIMORE, MD 21203-5523
PO BOX 23524, BALTIMORE, MD 21203-5524
PO BOX 23525, BALTIMORE, MD 21203-5525
PO BOX 23526, BALTIMORE, MD 21203-5526
PO BOX 23527, BALTIMORE, MD 21203-5527
PO BOX 23528, BALTIMORE, MD 21203-5528
PO BOX 23529, BALTIMORE, MD 21203-5529
PO BOX 23530, BALTIMORE, MD 21203-5530
PO BOX 23531, BALTIMORE, MD 21203-5531
PO BOX 23532, BALTIMORE, MD 21203-5532
PO BOX 23533, BALTIMORE, MD 21203-5533
PO BOX 23534, BALTIMORE, MD 21203-5534
PO BOX 23535, BALTIMORE, MD 21203-5535
PO BOX 23536, BALTIMORE, MD 21203-5536
PO BOX 23537, BALTIMORE, MD 21203-5537
PO BOX 23538, BALTIMORE, MD 21203-5538
PO BOX 23539, BALTIMORE, MD 21203-5539
PO BOX 23540, BALTIMORE, MD 21203-5540
PO BOX 23541, BALTIMORE, MD 21203-5541
PO BOX 23542, BALTIMORE, MD 21203-5542
PO BOX 23543, BALTIMORE, MD 21203-5543
PO BOX 23544, BALTIMORE, MD 21203-5544
PO BOX 23545, BALTIMORE, MD 21203-5545
PO BOX 23546, BALTIMORE, MD 21203-5546
PO BOX 23547, BALTIMORE, MD 21203-5547
PO BOX 23548, BALTIMORE, MD 21203-5548
PO BOX 23549, BALTIMORE, MD 21203-5549
PO BOX 23550, BALTIMORE, MD 21203-5550
PO BOX 23551, BALTIMORE, MD 21203-5551
PO BOX 23552, BALTIMORE, MD 21203-5552
PO BOX 23553, BALTIMORE, MD 21203-5553
PO BOX 23554, BALTIMORE, MD 21203-5554
PO BOX 23555, BALTIMORE, MD 21203-5555
PO BOX 23556, BALTIMORE, MD 21203-5556
PO BOX 23557, BALTIMORE, MD 21203-5557
PO BOX 23558, BALTIMORE, MD 21203-5558
PO BOX 23559, BALTIMORE, MD 21203-5559
PO BOX 23560, BALTIMORE, MD 21203-5560
PO BOX 23561, BALTIMORE, MD 21203-5561
PO BOX 23562, BALTIMORE, MD 21203-5562
PO BOX 23563, BALTIMORE, MD 21203-5563
PO BOX 23564, BALTIMORE, MD 21203-5564
PO BOX 23565, BALTIMORE, MD 21203-5565
PO BOX 23566, BALTIMORE, MD 21203-5566
PO BOX 23567, BALTIMORE, MD 21203-5567
PO BOX 23568, BALTIMORE, MD 21203-5568
PO BOX 23569, BALTIMORE, MD 21203-5569
PO BOX 23570, BALTIMORE, MD 21203-5570
PO BOX 23571, BALTIMORE, MD 21203-5571
PO BOX 23572, BALTIMORE, MD 21203-5572
PO BOX 23573, BALTIMORE, MD 21203-5573
PO BOX 23574, BALTIMORE, MD 21203-5574
PO BOX 23575, BALTIMORE, MD 21203-5575
PO BOX 23576, BALTIMORE, MD 21203-5576
PO BOX 23577, BALTIMORE, MD 21203-5577
PO BOX 23578, BALTIMORE, MD 21203-5578
PO BOX 23579, BALTIMORE, MD 21203-5579
PO BOX 23580, BALTIMORE, MD 21203-5580
PO BOX 23581, BALTIMORE, MD 21203-5581
PO BOX 23582, BALTIMORE, MD 21203-5582
PO BOX 23583, BALTIMORE, MD 21203-5583
PO BOX 23584, BALTIMORE, MD 21203-5584
PO BOX 23585, BALTIMORE, MD 21203-5585
PO BOX 23586, BALTIMORE, MD 21203-5586
PO BOX 23587, BALTIMORE, MD 21203-5587
PO BOX 23588, BALTIMORE, MD 21203-5588
PO BOX 23589, BALTIMORE, MD 21203-5589
PO BOX 23590, BALTIMORE, MD 21203-5590
PO BOX 23591, BALTIMORE, MD 21203-5591
PO BOX 23592, BALTIMORE, MD 21203-5592
PO BOX 23593, BALTIMORE, MD 21203-5593
PO BOX 23594, BALTIMORE, MD 21203-5594
PO BOX 23595, BALTIMORE, MD 21203-5595
PO BOX 23596, BALTIMORE, MD 21203-5596
PO BOX 23597, BALTIMORE, MD 21203-5597
PO BOX 23598, BALTIMORE, MD 21203-5598
PO BOX 23599, BALTIMORE, MD 21203-5599
PO BOX 23600, BALTIMORE, MD 21203-5600
PO BOX 23601, BALTIMORE, MD 21203-5601
PO BOX 23602, BALTIMORE, MD 21203-5602
PO BOX 23603, BALTIMORE, MD 21203-5603
PO BOX 23604, BALTIMORE, MD 21203-5604
PO BOX 23605, BALTIMORE, MD 21203-5605
PO BOX 23606, BALTIMORE, MD 21203-5606
PO BOX 23607, BALTIMORE, MD 21203-5607
PO BOX 23608, BALTIMORE, MD 21203-5608
PO BOX 23609, BALTIMORE, MD 21203-5609
PO BOX 23610, BALTIMORE, MD 21203-5610
PO BOX 23611, BALTIMORE, MD 21203-5611
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