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 5481, COLORADO SPRINGS, CO 80931-5481
PO BOX 5482, COLORADO SPRINGS, CO 80931-5482
PO BOX 5483, COLORADO SPRINGS, CO 80931-5483
PO BOX 5484, COLORADO SPRINGS, CO 80931-5484
PO BOX 5485, COLORADO SPRINGS, CO 80931-5485
PO BOX 5486, COLORADO SPRINGS, CO 80931-5486
PO BOX 5487, COLORADO SPRINGS, CO 80931-5487
PO BOX 5488, COLORADO SPRINGS, CO 80931-5488
PO BOX 5489, COLORADO SPRINGS, CO 80931-5489
PO BOX 5490, COLORADO SPRINGS, CO 80931-5490
PO BOX 5491, COLORADO SPRINGS, CO 80931-5491
PO BOX 5492, COLORADO SPRINGS, CO 80931-5492
PO BOX 5493, COLORADO SPRINGS, CO 80931-5493
PO BOX 5494, COLORADO SPRINGS, CO 80931-5494
PO BOX 5495, COLORADO SPRINGS, CO 80931-5495
PO BOX 5496, COLORADO SPRINGS, CO 80931-5496
PO BOX 5497, COLORADO SPRINGS, CO 80931-5497
PO BOX 5498, COLORADO SPRINGS, CO 80931-5498
PO BOX 5499, COLORADO SPRINGS, CO 80931-5499
PO BOX 5500, COLORADO SPRINGS, CO 80931-5500
PO BOX 5501, COLORADO SPRINGS, CO 80931-5501
PO BOX 5502, COLORADO SPRINGS, CO 80931-5502
PO BOX 5503, COLORADO SPRINGS, CO 80931-5503
PO BOX 5504, COLORADO SPRINGS, CO 80931-5504
PO BOX 5505, COLORADO SPRINGS, CO 80931-5505
PO BOX 5506, COLORADO SPRINGS, CO 80931-5506
PO BOX 5507, COLORADO SPRINGS, CO 80931-5507
PO BOX 5508, COLORADO SPRINGS, CO 80931-5508
PO BOX 5509, COLORADO SPRINGS, CO 80931-5509
PO BOX 5510, COLORADO SPRINGS, CO 80931-5510
PO BOX 5511, COLORADO SPRINGS, CO 80931-5511
PO BOX 5512, COLORADO SPRINGS, CO 80931-5512
PO BOX 5513, COLORADO SPRINGS, CO 80931-5513
PO BOX 5514, COLORADO SPRINGS, CO 80931-5514
PO BOX 5515, COLORADO SPRINGS, CO 80931-5515
PO BOX 5516, COLORADO SPRINGS, CO 80931-5516
PO BOX 5517, COLORADO SPRINGS, CO 80931-5517
PO BOX 5518, COLORADO SPRINGS, CO 80931-5518
PO BOX 5519, COLORADO SPRINGS, CO 80931-5519
PO BOX 5520, COLORADO SPRINGS, CO 80931-5520
PO BOX 5521, COLORADO SPRINGS, CO 80931-5521
PO BOX 5522, COLORADO SPRINGS, CO 80931-5522
PO BOX 5523, COLORADO SPRINGS, CO 80931-5523
PO BOX 5524, COLORADO SPRINGS, CO 80931-5524
PO BOX 5525, COLORADO SPRINGS, CO 80931-5525
PO BOX 5526, COLORADO SPRINGS, CO 80931-5526
PO BOX 5527, COLORADO SPRINGS, CO 80931-5527
PO BOX 5528, COLORADO SPRINGS, CO 80931-5528
PO BOX 5529, COLORADO SPRINGS, CO 80931-5529
PO BOX 5530, COLORADO SPRINGS, CO 80931-5530
PO BOX 5531, COLORADO SPRINGS, CO 80931-5531
PO BOX 5532, COLORADO SPRINGS, CO 80931-5532
PO BOX 5533, COLORADO SPRINGS, CO 80931-5533
PO BOX 5534, COLORADO SPRINGS, CO 80931-5534
PO BOX 5535, COLORADO SPRINGS, CO 80931-5535
PO BOX 5536, COLORADO SPRINGS, CO 80931-5536
PO BOX 5537, COLORADO SPRINGS, CO 80931-5537
PO BOX 5538, COLORADO SPRINGS, CO 80931-5538
PO BOX 5539, COLORADO SPRINGS, CO 80931-5539
PO BOX 5540, COLORADO SPRINGS, CO 80931-5540
PO BOX 5541, COLORADO SPRINGS, CO 80931-5541
PO BOX 5542, COLORADO SPRINGS, CO 80931-5542
PO BOX 5543, COLORADO SPRINGS, CO 80931-5543
PO BOX 5544, COLORADO SPRINGS, CO 80931-5544
PO BOX 5545, COLORADO SPRINGS, CO 80931-5545
PO BOX 5546, COLORADO SPRINGS, CO 80931-5546
PO BOX 5547, COLORADO SPRINGS, CO 80931-5547
PO BOX 5548, COLORADO SPRINGS, CO 80931-5548
PO BOX 5549, COLORADO SPRINGS, CO 80931-5549
PO BOX 5550, COLORADO SPRINGS, CO 80931-5550
PO BOX 5551, COLORADO SPRINGS, CO 80931-5551
PO BOX 5552, COLORADO SPRINGS, CO 80931-5552
PO BOX 5553, COLORADO SPRINGS, CO 80931-5553
PO BOX 5554, COLORADO SPRINGS, CO 80931-5554
PO BOX 5555, COLORADO SPRINGS, CO 80931-5555
PO BOX 5556, COLORADO SPRINGS, CO 80931-5556
PO BOX 5557, COLORADO SPRINGS, CO 80931-5557
PO BOX 5558, COLORADO SPRINGS, CO 80931-5558
PO BOX 5559, COLORADO SPRINGS, CO 80931-5559
PO BOX 5560, COLORADO SPRINGS, CO 80931-5560
PO BOX 5561, COLORADO SPRINGS, CO 80931-5561
PO BOX 5562, COLORADO SPRINGS, CO 80931-5562
PO BOX 5563, COLORADO SPRINGS, CO 80931-5563
PO BOX 5564, COLORADO SPRINGS, CO 80931-5564
PO BOX 5565, COLORADO SPRINGS, CO 80931-5565
PO BOX 5566, COLORADO SPRINGS, CO 80931-5566
PO BOX 5567, COLORADO SPRINGS, CO 80931-5567
PO BOX 5568, COLORADO SPRINGS, CO 80931-5568
PO BOX 5569, COLORADO SPRINGS, CO 80931-5569
PO BOX 5570, COLORADO SPRINGS, CO 80931-5570
PO BOX 5571, COLORADO SPRINGS, CO 80931-5571
PO BOX 5572, COLORADO SPRINGS, CO 80931-5572
PO BOX 5573, COLORADO SPRINGS, CO 80931-5573
PO BOX 5574, COLORADO SPRINGS, CO 80931-5574
PO BOX 5575, COLORADO SPRINGS, CO 80931-5575
PO BOX 5576, COLORADO SPRINGS, CO 80931-5576
PO BOX 5577, COLORADO SPRINGS, CO 80931-5577
PO BOX 5578, COLORADO SPRINGS, CO 80931-5578
PO BOX 5579, COLORADO SPRINGS, CO 80931-5579
PO BOX 5580, COLORADO SPRINGS, CO 80931-5580
PO BOX 5581, COLORADO SPRINGS, CO 80931-5581
PO BOX 5582, COLORADO SPRINGS, CO 80931-5582
PO BOX 5583, COLORADO SPRINGS, CO 80931-5583
PO BOX 5584, COLORADO SPRINGS, CO 80931-5584
PO BOX 5585, COLORADO SPRINGS, CO 80931-5585
PO BOX 5586, COLORADO SPRINGS, CO 80931-5586
PO BOX 5587, COLORADO SPRINGS, CO 80931-5587
PO BOX 5588, COLORADO SPRINGS, CO 80931-5588
PO BOX 5589, COLORADO SPRINGS, CO 80931-5589
PO BOX 5590, COLORADO SPRINGS, CO 80931-5590
PO BOX 5591, COLORADO SPRINGS, CO 80931-5591
PO BOX 5592, COLORADO SPRINGS, CO 80931-5592
PO BOX 5593, COLORADO SPRINGS, CO 80931-5593
PO BOX 5594, COLORADO SPRINGS, CO 80931-5594
PO BOX 5595, COLORADO SPRINGS, CO 80931-5595
PO BOX 5596, COLORADO SPRINGS, CO 80931-5596
PO BOX 5597, COLORADO SPRINGS, CO 80931-5597
PO BOX 5598, COLORADO SPRINGS, CO 80931-5598
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