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 451, DURANGO, CO 81302-0451
PO BOX 452, DURANGO, CO 81302-0452
PO BOX 453, DURANGO, CO 81302-0453
PO BOX 454, DURANGO, CO 81302-0454
PO BOX 455, DURANGO, CO 81302-0455
PO BOX 456, DURANGO, CO 81302-0456
PO BOX 457, DURANGO, CO 81302-0457
PO BOX 458, DURANGO, CO 81302-0458
PO BOX 459, DURANGO, CO 81302-0459
PO BOX 460, DURANGO, CO 81302-0460
PO BOX 461, DURANGO, CO 81302-0461
PO BOX 462, DURANGO, CO 81302-0462
PO BOX 463, DURANGO, CO 81302-0463
PO BOX 464, DURANGO, CO 81302-0464
PO BOX 465, DURANGO, CO 81302-0465
PO BOX 466, DURANGO, CO 81302-0466
PO BOX 467, DURANGO, CO 81302-0467
PO BOX 468, DURANGO, CO 81302-0468
PO BOX 469, DURANGO, CO 81302-0469
PO BOX 470, DURANGO, CO 81302-0470
PO BOX 471, DURANGO, CO 81302-0471
PO BOX 472, DURANGO, CO 81302-0472
PO BOX 473, DURANGO, CO 81302-0473
PO BOX 474, DURANGO, CO 81302-0474
PO BOX 475, DURANGO, CO 81302-0475
PO BOX 476, DURANGO, CO 81302-0476
PO BOX 477, DURANGO, CO 81302-0477
PO BOX 478, DURANGO, CO 81302-0478
PO BOX 479, DURANGO, CO 81302-0479
PO BOX 480, DURANGO, CO 81302-0480
PO BOX 481, DURANGO, CO 81302-0481
PO BOX 482, DURANGO, CO 81302-0482
PO BOX 483, DURANGO, CO 81302-0483
PO BOX 484, DURANGO, CO 81302-0484
PO BOX 485, DURANGO, CO 81302-0485
PO BOX 486, DURANGO, CO 81302-0486
PO BOX 487, DURANGO, CO 81302-0487
PO BOX 488, DURANGO, CO 81302-0488
PO BOX 489, DURANGO, CO 81302-0489
PO BOX 490, DURANGO, CO 81302-0490
PO BOX 491, DURANGO, CO 81302-0491
PO BOX 492, DURANGO, CO 81302-0492
PO BOX 493, DURANGO, CO 81302-0493
PO BOX 494, DURANGO, CO 81302-0494
PO BOX 495, DURANGO, CO 81302-0495
PO BOX 496, DURANGO, CO 81302-0496
PO BOX 497, DURANGO, CO 81302-0497
PO BOX 498, DURANGO, CO 81302-0498
PO BOX 499, DURANGO, CO 81302-0499
PO BOX 500, DURANGO, CO 81302-0500
PO BOX 501, DURANGO, CO 81302-0501
PO BOX 502, DURANGO, CO 81302-0502
PO BOX 503, DURANGO, CO 81302-0503
PO BOX 504, DURANGO, CO 81302-0504
PO BOX 505, DURANGO, CO 81302-0505
PO BOX 506, DURANGO, CO 81302-0506
PO BOX 507, DURANGO, CO 81302-0507
PO BOX 508, DURANGO, CO 81302-0508
PO BOX 509, DURANGO, CO 81302-0509
PO BOX 510, DURANGO, CO 81302-0510
PO BOX 511, DURANGO, CO 81302-0511
PO BOX 512, DURANGO, CO 81302-0512
PO BOX 513, DURANGO, CO 81302-0513
PO BOX 514, DURANGO, CO 81302-0514
PO BOX 515, DURANGO, CO 81302-0515
PO BOX 516, DURANGO, CO 81302-0516
PO BOX 517, DURANGO, CO 81302-0517
PO BOX 518, DURANGO, CO 81302-0518
PO BOX 519, DURANGO, CO 81302-0519
PO BOX 520, DURANGO, CO 81302-0520
PO BOX 521, DURANGO, CO 81302-0521
PO BOX 522, DURANGO, CO 81302-0522
PO BOX 523, DURANGO, CO 81302-0523
PO BOX 524, DURANGO, CO 81302-0524
PO BOX 525, DURANGO, CO 81302-0525
PO BOX 526, DURANGO, CO 81302-0526
PO BOX 527, DURANGO, CO 81302-0527
PO BOX 528, DURANGO, CO 81302-0528
PO BOX 529, DURANGO, CO 81302-0529
PO BOX 530, DURANGO, CO 81302-0530
PO BOX 531, DURANGO, CO 81302-0531
PO BOX 532, DURANGO, CO 81302-0532
PO BOX 533, DURANGO, CO 81302-0533
PO BOX 534, DURANGO, CO 81302-0534
PO BOX 535, DURANGO, CO 81302-0535
PO BOX 536, DURANGO, CO 81302-0536
PO BOX 537, DURANGO, CO 81302-0537
PO BOX 538, DURANGO, CO 81302-0538
PO BOX 539, DURANGO, CO 81302-0539
PO BOX 540, DURANGO, CO 81302-0540
PO BOX 541, DURANGO, CO 81302-0541
PO BOX 542, DURANGO, CO 81302-0542
PO BOX 543, DURANGO, CO 81302-0543
PO BOX 544, DURANGO, CO 81302-0544
PO BOX 545, DURANGO, CO 81302-0545
PO BOX 546, DURANGO, CO 81302-0546
PO BOX 547, DURANGO, CO 81302-0547
PO BOX 548, DURANGO, CO 81302-0548
PO BOX 549, DURANGO, CO 81302-0549
PO BOX 550, DURANGO, CO 81302-0550
PO BOX 551, DURANGO, CO 81302-0551
PO BOX 552, DURANGO, CO 81302-0552
PO BOX 553, DURANGO, CO 81302-0553
PO BOX 554, DURANGO, CO 81302-0554
PO BOX 555, DURANGO, CO 81302-0555
PO BOX 556, DURANGO, CO 81302-0556
PO BOX 557, DURANGO, CO 81302-0557
PO BOX 558, DURANGO, CO 81302-0558
PO BOX 559, DURANGO, CO 81302-0559
PO BOX 560, DURANGO, CO 81302-0560
PO BOX 561, DURANGO, CO 81302-0561
PO BOX 562, DURANGO, CO 81302-0562
PO BOX 563, DURANGO, CO 81302-0563
PO BOX 564, DURANGO, CO 81302-0564
PO BOX 565, DURANGO, CO 81302-0565
PO BOX 566, DURANGO, CO 81302-0566
PO BOX 567, DURANGO, CO 81302-0567
PO BOX 568, DURANGO, CO 81302-0568
PO BOX 569, DURANGO, CO 81302-0569
PO BOX 570, DURANGO, CO 81302-0570
PO BOX 571, DURANGO, CO 81302-0571
PO BOX 572, DURANGO, CO 81302-0572
PO BOX 573, DURANGO, CO 81302-0573
PO BOX 574, DURANGO, CO 81302-0574
PO BOX 575, DURANGO, CO 81302-0575
PO BOX 576, DURANGO, CO 81302-0576
PO BOX 577, DURANGO, CO 81302-0577
PO BOX 578, DURANGO, CO 81302-0578
PO BOX 579, DURANGO, CO 81302-0579
PO BOX 580, DURANGO, CO 81302-0580
PO BOX 581, DURANGO, CO 81302-0581
PO BOX 582, DURANGO, CO 81302-0582
PO BOX 583, DURANGO, CO 81302-0583
PO BOX 584, DURANGO, CO 81302-0584
PO BOX 585, DURANGO, CO 81302-0585
PO BOX 586, DURANGO, CO 81302-0586
PO BOX 587, DURANGO, CO 81302-0587
PO BOX 588, DURANGO, CO 81302-0588
PO BOX 589, DURANGO, CO 81302-0589
PO BOX 590, DURANGO, CO 81302-0590
PO BOX 591, DURANGO, CO 81302-0591
PO BOX 592, DURANGO, CO 81302-0592
PO BOX 593, DURANGO, CO 81302-0593
PO BOX 594, DURANGO, CO 81302-0594
PO BOX 595, DURANGO, CO 81302-0595
PO BOX 596, DURANGO, CO 81302-0596
PO BOX 597, DURANGO, CO 81302-0597
PO BOX 598, DURANGO, CO 81302-0598
PO BOX 599, DURANGO, CO 81302-0599
PO BOX 600, DURANGO, CO 81302-0600
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