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 481, GLENWOOD SPRINGS, CO 81602-0481
PO BOX 482, GLENWOOD SPRINGS, CO 81602-0482
PO BOX 483, GLENWOOD SPRINGS, CO 81602-0483
PO BOX 484, GLENWOOD SPRINGS, CO 81602-0484
PO BOX 485, GLENWOOD SPRINGS, CO 81602-0485
PO BOX 486, GLENWOOD SPRINGS, CO 81602-0486
PO BOX 487, GLENWOOD SPRINGS, CO 81602-0487
PO BOX 488, GLENWOOD SPRINGS, CO 81602-0488
PO BOX 489, GLENWOOD SPRINGS, CO 81602-0489
PO BOX 490, GLENWOOD SPRINGS, CO 81602-0490
PO BOX 491, GLENWOOD SPRINGS, CO 81602-0491
PO BOX 492, GLENWOOD SPRINGS, CO 81602-0492
PO BOX 493, GLENWOOD SPRINGS, CO 81602-0493
PO BOX 494, GLENWOOD SPRINGS, CO 81602-0494
PO BOX 495, GLENWOOD SPRINGS, CO 81602-0495
PO BOX 496, GLENWOOD SPRINGS, CO 81602-0496
PO BOX 497, GLENWOOD SPRINGS, CO 81602-0497
PO BOX 498, GLENWOOD SPRINGS, CO 81602-0498
PO BOX 499, GLENWOOD SPRINGS, CO 81602-0499
PO BOX 500, GLENWOOD SPRINGS, CO 81602-0500
PO BOX 501, GLENWOOD SPRINGS, CO 81602-0501
PO BOX 502, GLENWOOD SPRINGS, CO 81602-0502
PO BOX 503, GLENWOOD SPRINGS, CO 81602-0503
PO BOX 504, GLENWOOD SPRINGS, CO 81602-0504
PO BOX 505, GLENWOOD SPRINGS, CO 81602-0505
PO BOX 506, GLENWOOD SPRINGS, CO 81602-0506
PO BOX 507, GLENWOOD SPRINGS, CO 81602-0507
PO BOX 508, GLENWOOD SPRINGS, CO 81602-0508
PO BOX 509, GLENWOOD SPRINGS, CO 81602-0509
PO BOX 510, GLENWOOD SPRINGS, CO 81602-0510
PO BOX 511, GLENWOOD SPRINGS, CO 81602-0511
PO BOX 512, GLENWOOD SPRINGS, CO 81602-0512
PO BOX 513, GLENWOOD SPRINGS, CO 81602-0513
PO BOX 514, GLENWOOD SPRINGS, CO 81602-0514
PO BOX 515, GLENWOOD SPRINGS, CO 81602-0515
PO BOX 516, GLENWOOD SPRINGS, CO 81602-0516
PO BOX 517, GLENWOOD SPRINGS, CO 81602-0517
PO BOX 518, GLENWOOD SPRINGS, CO 81602-0518
PO BOX 519, GLENWOOD SPRINGS, CO 81602-0519
PO BOX 520, GLENWOOD SPRINGS, CO 81602-0520
PO BOX 521, GLENWOOD SPRINGS, CO 81602-0521
PO BOX 522, GLENWOOD SPRINGS, CO 81602-0522
PO BOX 523, GLENWOOD SPRINGS, CO 81602-0523
PO BOX 524, GLENWOOD SPRINGS, CO 81602-0524
PO BOX 525, GLENWOOD SPRINGS, CO 81602-0525
PO BOX 526, GLENWOOD SPRINGS, CO 81602-0526
PO BOX 527, GLENWOOD SPRINGS, CO 81602-0527
PO BOX 528, GLENWOOD SPRINGS, CO 81602-0528
PO BOX 529, GLENWOOD SPRINGS, CO 81602-0529
PO BOX 530, GLENWOOD SPRINGS, CO 81602-0530
PO BOX 531, GLENWOOD SPRINGS, CO 81602-0531
PO BOX 532, GLENWOOD SPRINGS, CO 81602-0532
PO BOX 533, GLENWOOD SPRINGS, CO 81602-0533
PO BOX 534, GLENWOOD SPRINGS, CO 81602-0534
PO BOX 535, GLENWOOD SPRINGS, CO 81602-0535
PO BOX 536, GLENWOOD SPRINGS, CO 81602-0536
PO BOX 537, GLENWOOD SPRINGS, CO 81602-0537
PO BOX 538, GLENWOOD SPRINGS, CO 81602-0538
PO BOX 539, GLENWOOD SPRINGS, CO 81602-0539
PO BOX 540, GLENWOOD SPRINGS, CO 81602-0540
PO BOX 541, GLENWOOD SPRINGS, CO 81602-0541
PO BOX 542, GLENWOOD SPRINGS, CO 81602-0542
PO BOX 543, GLENWOOD SPRINGS, CO 81602-0543
PO BOX 544, GLENWOOD SPRINGS, CO 81602-0544
PO BOX 545, GLENWOOD SPRINGS, CO 81602-0545
PO BOX 546, GLENWOOD SPRINGS, CO 81602-0546
PO BOX 547, GLENWOOD SPRINGS, CO 81602-0547
PO BOX 548, GLENWOOD SPRINGS, CO 81602-0548
PO BOX 549, GLENWOOD SPRINGS, CO 81602-0549
PO BOX 550, GLENWOOD SPRINGS, CO 81602-0550
PO BOX 551, GLENWOOD SPRINGS, CO 81602-0551
PO BOX 552, GLENWOOD SPRINGS, CO 81602-0552
PO BOX 553, GLENWOOD SPRINGS, CO 81602-0553
PO BOX 554, GLENWOOD SPRINGS, CO 81602-0554
PO BOX 555, GLENWOOD SPRINGS, CO 81602-0555
PO BOX 556, GLENWOOD SPRINGS, CO 81602-0556
PO BOX 557, GLENWOOD SPRINGS, CO 81602-0557
PO BOX 558, GLENWOOD SPRINGS, CO 81602-0558
PO BOX 559, GLENWOOD SPRINGS, CO 81602-0559
PO BOX 560, GLENWOOD SPRINGS, CO 81602-0560
PO BOX 561, GLENWOOD SPRINGS, CO 81602-0561
PO BOX 562, GLENWOOD SPRINGS, CO 81602-0562
PO BOX 563, GLENWOOD SPRINGS, CO 81602-0563
PO BOX 564, GLENWOOD SPRINGS, CO 81602-0564
PO BOX 565, GLENWOOD SPRINGS, CO 81602-0565
PO BOX 566, GLENWOOD SPRINGS, CO 81602-0566
PO BOX 567, GLENWOOD SPRINGS, CO 81602-0567
PO BOX 568, GLENWOOD SPRINGS, CO 81602-0568
PO BOX 569, GLENWOOD SPRINGS, CO 81602-0569
PO BOX 570, GLENWOOD SPRINGS, CO 81602-0570
PO BOX 571, GLENWOOD SPRINGS, CO 81602-0571
PO BOX 572, GLENWOOD SPRINGS, CO 81602-0572
PO BOX 573, GLENWOOD SPRINGS, CO 81602-0573
PO BOX 574, GLENWOOD SPRINGS, CO 81602-0574
PO BOX 575, GLENWOOD SPRINGS, CO 81602-0575
PO BOX 576, GLENWOOD SPRINGS, CO 81602-0576
PO BOX 577, GLENWOOD SPRINGS, CO 81602-0577
PO BOX 578, GLENWOOD SPRINGS, CO 81602-0578
PO BOX 579, GLENWOOD SPRINGS, CO 81602-0579
PO BOX 580, GLENWOOD SPRINGS, CO 81602-0580
PO BOX 581, GLENWOOD SPRINGS, CO 81602-0581
PO BOX 582, GLENWOOD SPRINGS, CO 81602-0582
PO BOX 583, GLENWOOD SPRINGS, CO 81602-0583
PO BOX 584, GLENWOOD SPRINGS, CO 81602-0584
PO BOX 585, GLENWOOD SPRINGS, CO 81602-0585
PO BOX 586, GLENWOOD SPRINGS, CO 81602-0586
PO BOX 587, GLENWOOD SPRINGS, CO 81602-0587
PO BOX 588, GLENWOOD SPRINGS, CO 81602-0588
PO BOX 589, GLENWOOD SPRINGS, CO 81602-0589
PO BOX 590, GLENWOOD SPRINGS, CO 81602-0590
PO BOX 591, GLENWOOD SPRINGS, CO 81602-0591
PO BOX 592, GLENWOOD SPRINGS, CO 81602-0592
PO BOX 593, GLENWOOD SPRINGS, CO 81602-0593
PO BOX 594, GLENWOOD SPRINGS, CO 81602-0594
PO BOX 595, GLENWOOD SPRINGS, CO 81602-0595
PO BOX 596, GLENWOOD SPRINGS, CO 81602-0596
PO BOX 597, GLENWOOD SPRINGS, CO 81602-0597
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