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 5361, COLORADO SPRINGS, CO 80931-5361
PO BOX 5362, COLORADO SPRINGS, CO 80931-5362
PO BOX 5363, COLORADO SPRINGS, CO 80931-5363
PO BOX 5364, COLORADO SPRINGS, CO 80931-5364
PO BOX 5365, COLORADO SPRINGS, CO 80931-5365
PO BOX 5366, COLORADO SPRINGS, CO 80931-5366
PO BOX 5367, COLORADO SPRINGS, CO 80931-5367
PO BOX 5368, COLORADO SPRINGS, CO 80931-5368
PO BOX 5369, COLORADO SPRINGS, CO 80931-5369
PO BOX 5370, COLORADO SPRINGS, CO 80931-5370
PO BOX 5371, COLORADO SPRINGS, CO 80931-5371
PO BOX 5372, COLORADO SPRINGS, CO 80931-5372
PO BOX 5373, COLORADO SPRINGS, CO 80931-5373
PO BOX 5374, COLORADO SPRINGS, CO 80931-5374
PO BOX 5375, COLORADO SPRINGS, CO 80931-5375
PO BOX 5376, COLORADO SPRINGS, CO 80931-5376
PO BOX 5377, COLORADO SPRINGS, CO 80931-5377
PO BOX 5378, COLORADO SPRINGS, CO 80931-5378
PO BOX 5379, COLORADO SPRINGS, CO 80931-5379
PO BOX 5380, COLORADO SPRINGS, CO 80931-5380
PO BOX 5381, COLORADO SPRINGS, CO 80931-5381
PO BOX 5382, COLORADO SPRINGS, CO 80931-5382
PO BOX 5383, COLORADO SPRINGS, CO 80931-5383
PO BOX 5384, COLORADO SPRINGS, CO 80931-5384
PO BOX 5385, COLORADO SPRINGS, CO 80931-5385
PO BOX 5386, COLORADO SPRINGS, CO 80931-5386
PO BOX 5387, COLORADO SPRINGS, CO 80931-5387
PO BOX 5388, COLORADO SPRINGS, CO 80931-5388
PO BOX 5389, COLORADO SPRINGS, CO 80931-5389
PO BOX 5390, COLORADO SPRINGS, CO 80931-5390
PO BOX 5391, COLORADO SPRINGS, CO 80931-5391
PO BOX 5392, COLORADO SPRINGS, CO 80931-5392
PO BOX 5393, COLORADO SPRINGS, CO 80931-5393
PO BOX 5394, COLORADO SPRINGS, CO 80931-5394
PO BOX 5395, COLORADO SPRINGS, CO 80931-5395
PO BOX 5396, COLORADO SPRINGS, CO 80931-5396
PO BOX 5397, COLORADO SPRINGS, CO 80931-5397
PO BOX 5398, COLORADO SPRINGS, CO 80931-5398
PO BOX 5399, COLORADO SPRINGS, CO 80931-5399
PO BOX 5400, COLORADO SPRINGS, CO 80931-5400
PO BOX 5401, COLORADO SPRINGS, CO 80931-5401
PO BOX 5402, COLORADO SPRINGS, CO 80931-5402
PO BOX 5403, COLORADO SPRINGS, CO 80931-5403
PO BOX 5404, COLORADO SPRINGS, CO 80931-5404
PO BOX 5405, COLORADO SPRINGS, CO 80931-5405
PO BOX 5406, COLORADO SPRINGS, CO 80931-5406
PO BOX 5407, COLORADO SPRINGS, CO 80931-5407
PO BOX 5408, COLORADO SPRINGS, CO 80931-5408
PO BOX 5409, COLORADO SPRINGS, CO 80931-5409
PO BOX 5410, COLORADO SPRINGS, CO 80931-5410
PO BOX 5411, COLORADO SPRINGS, CO 80931-5411
PO BOX 5412, COLORADO SPRINGS, CO 80931-5412
PO BOX 5413, COLORADO SPRINGS, CO 80931-5413
PO BOX 5414, COLORADO SPRINGS, CO 80931-5414
PO BOX 5415, COLORADO SPRINGS, CO 80931-5415
PO BOX 5416, COLORADO SPRINGS, CO 80931-5416
PO BOX 5417, COLORADO SPRINGS, CO 80931-5417
PO BOX 5418, COLORADO SPRINGS, CO 80931-5418
PO BOX 5419, COLORADO SPRINGS, CO 80931-5419
PO BOX 5420, COLORADO SPRINGS, CO 80931-5420
PO BOX 5421, COLORADO SPRINGS, CO 80931-5421
PO BOX 5422, COLORADO SPRINGS, CO 80931-5422
PO BOX 5423, COLORADO SPRINGS, CO 80931-5423
PO BOX 5424, COLORADO SPRINGS, CO 80931-5424
PO BOX 5425, COLORADO SPRINGS, CO 80931-5425
PO BOX 5426, COLORADO SPRINGS, CO 80931-5426
PO BOX 5427, COLORADO SPRINGS, CO 80931-5427
PO BOX 5428, COLORADO SPRINGS, CO 80931-5428
PO BOX 5429, COLORADO SPRINGS, CO 80931-5429
PO BOX 5430, COLORADO SPRINGS, CO 80931-5430
PO BOX 5431, COLORADO SPRINGS, CO 80931-5431
PO BOX 5432, COLORADO SPRINGS, CO 80931-5432
PO BOX 5433, COLORADO SPRINGS, CO 80931-5433
PO BOX 5434, COLORADO SPRINGS, CO 80931-5434
PO BOX 5435, COLORADO SPRINGS, CO 80931-5435
PO BOX 5436, COLORADO SPRINGS, CO 80931-5436
PO BOX 5437, COLORADO SPRINGS, CO 80931-5437
PO BOX 5438, COLORADO SPRINGS, CO 80931-5438
PO BOX 5439, COLORADO SPRINGS, CO 80931-5439
PO BOX 5440, COLORADO SPRINGS, CO 80931-5440
PO BOX 5441, COLORADO SPRINGS, CO 80931-5441
PO BOX 5442, COLORADO SPRINGS, CO 80931-5442
PO BOX 5443, COLORADO SPRINGS, CO 80931-5443
PO BOX 5444, COLORADO SPRINGS, CO 80931-5444
PO BOX 5445, COLORADO SPRINGS, CO 80931-5445
PO BOX 5446, COLORADO SPRINGS, CO 80931-5446
PO BOX 5447, COLORADO SPRINGS, CO 80931-5447
PO BOX 5448, COLORADO SPRINGS, CO 80931-5448
PO BOX 5449, COLORADO SPRINGS, CO 80931-5449
PO BOX 5450, COLORADO SPRINGS, CO 80931-5450
PO BOX 5451, COLORADO SPRINGS, CO 80931-5451
PO BOX 5452, COLORADO SPRINGS, CO 80931-5452
PO BOX 5453, COLORADO SPRINGS, CO 80931-5453
PO BOX 5454, COLORADO SPRINGS, CO 80931-5454
PO BOX 5455, COLORADO SPRINGS, CO 80931-5455
PO BOX 5456, COLORADO SPRINGS, CO 80931-5456
PO BOX 5457, COLORADO SPRINGS, CO 80931-5457
PO BOX 5458, COLORADO SPRINGS, CO 80931-5458
PO BOX 5459, COLORADO SPRINGS, CO 80931-5459
PO BOX 5460, COLORADO SPRINGS, CO 80931-5460
PO BOX 5461, COLORADO SPRINGS, CO 80931-5461
PO BOX 5462, COLORADO SPRINGS, CO 80931-5462
PO BOX 5463, COLORADO SPRINGS, CO 80931-5463
PO BOX 5464, COLORADO SPRINGS, CO 80931-5464
PO BOX 5465, COLORADO SPRINGS, CO 80931-5465
PO BOX 5466, COLORADO SPRINGS, CO 80931-5466
PO BOX 5467, COLORADO SPRINGS, CO 80931-5467
PO BOX 5468, COLORADO SPRINGS, CO 80931-5468
PO BOX 5469, COLORADO SPRINGS, CO 80931-5469
PO BOX 5470, COLORADO SPRINGS, CO 80931-5470
PO BOX 5471, COLORADO SPRINGS, CO 80931-5471
PO BOX 5472, COLORADO SPRINGS, CO 80931-5472
PO BOX 5473, COLORADO SPRINGS, CO 80931-5473
PO BOX 5474, COLORADO SPRINGS, CO 80931-5474
PO BOX 5475, COLORADO SPRINGS, CO 80931-5475
PO BOX 5476, COLORADO SPRINGS, CO 80931-5476
PO BOX 5477, COLORADO SPRINGS, CO 80931-5477
PO BOX 5478, COLORADO SPRINGS, CO 80931-5478
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