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, GRAND JUNCTION, CO 81502-0481
PO BOX 482, GRAND JUNCTION, CO 81502-0482
PO BOX 483, GRAND JUNCTION, CO 81502-0483
PO BOX 484, GRAND JUNCTION, CO 81502-0484
PO BOX 485, GRAND JUNCTION, CO 81502-0485
PO BOX 486, GRAND JUNCTION, CO 81502-0486
PO BOX 487, GRAND JUNCTION, CO 81502-0487
PO BOX 488, GRAND JUNCTION, CO 81502-0488
PO BOX 489, GRAND JUNCTION, CO 81502-0489
PO BOX 490, GRAND JUNCTION, CO 81502-0490
PO BOX 491, GRAND JUNCTION, CO 81502-0491
PO BOX 492, GRAND JUNCTION, CO 81502-0492
PO BOX 493, GRAND JUNCTION, CO 81502-0493
PO BOX 494, GRAND JUNCTION, CO 81502-0494
PO BOX 495, GRAND JUNCTION, CO 81502-0495
PO BOX 496, GRAND JUNCTION, CO 81502-0496
PO BOX 497, GRAND JUNCTION, CO 81502-0497
PO BOX 498, GRAND JUNCTION, CO 81502-0498
PO BOX 499, GRAND JUNCTION, CO 81502-0499
PO BOX 500, GRAND JUNCTION, CO 81502-0500
PO BOX 501, GRAND JUNCTION, CO 81502-0501
PO BOX 502, GRAND JUNCTION, CO 81502-0502
PO BOX 503, GRAND JUNCTION, CO 81502-0503
PO BOX 504, GRAND JUNCTION, CO 81502-0504
PO BOX 505, GRAND JUNCTION, CO 81502-0505
PO BOX 506, GRAND JUNCTION, CO 81502-0506
PO BOX 507, GRAND JUNCTION, CO 81502-0507
PO BOX 508, GRAND JUNCTION, CO 81502-0508
PO BOX 509, GRAND JUNCTION, CO 81502-0509
PO BOX 510, GRAND JUNCTION, CO 81502-0510
PO BOX 511, GRAND JUNCTION, CO 81502-0511
PO BOX 512, GRAND JUNCTION, CO 81502-0512
PO BOX 513, GRAND JUNCTION, CO 81502-0513
PO BOX 514, GRAND JUNCTION, CO 81502-0514
PO BOX 515, GRAND JUNCTION, CO 81502-0515
PO BOX 516, GRAND JUNCTION, CO 81502-0516
PO BOX 517, GRAND JUNCTION, CO 81502-0517
PO BOX 518, GRAND JUNCTION, CO 81502-0518
PO BOX 519, GRAND JUNCTION, CO 81502-0519
PO BOX 520, GRAND JUNCTION, CO 81502-0520
PO BOX 521, GRAND JUNCTION, CO 81502-0521
PO BOX 522, GRAND JUNCTION, CO 81502-0522
PO BOX 523, GRAND JUNCTION, CO 81502-0523
PO BOX 524, GRAND JUNCTION, CO 81502-0524
PO BOX 525, GRAND JUNCTION, CO 81502-0525
PO BOX 526, GRAND JUNCTION, CO 81502-0526
PO BOX 527, GRAND JUNCTION, CO 81502-0527
PO BOX 528, GRAND JUNCTION, CO 81502-0528
PO BOX 529, GRAND JUNCTION, CO 81502-0529
PO BOX 530, GRAND JUNCTION, CO 81502-0530
PO BOX 531, GRAND JUNCTION, CO 81502-0531
PO BOX 532, GRAND JUNCTION, CO 81502-0532
PO BOX 533, GRAND JUNCTION, CO 81502-0533
PO BOX 534, GRAND JUNCTION, CO 81502-0534
PO BOX 535, GRAND JUNCTION, CO 81502-0535
PO BOX 536, GRAND JUNCTION, CO 81502-0536
PO BOX 537, GRAND JUNCTION, CO 81502-0537
PO BOX 538, GRAND JUNCTION, CO 81502-0538
PO BOX 539, GRAND JUNCTION, CO 81502-0539
PO BOX 540, GRAND JUNCTION, CO 81502-0540
PO BOX 541, GRAND JUNCTION, CO 81502-0541
PO BOX 542, GRAND JUNCTION, CO 81502-0542
PO BOX 543, GRAND JUNCTION, CO 81502-0543
PO BOX 544, GRAND JUNCTION, CO 81502-0544
PO BOX 545, GRAND JUNCTION, CO 81502-0545
PO BOX 546, GRAND JUNCTION, CO 81502-0546
PO BOX 547, GRAND JUNCTION, CO 81502-0547
PO BOX 548, GRAND JUNCTION, CO 81502-0548
PO BOX 549, GRAND JUNCTION, CO 81502-0549
PO BOX 550, GRAND JUNCTION, CO 81502-0550
PO BOX 551, GRAND JUNCTION, CO 81502-0551
PO BOX 552, GRAND JUNCTION, CO 81502-0552
PO BOX 553, GRAND JUNCTION, CO 81502-0553
PO BOX 554, GRAND JUNCTION, CO 81502-0554
PO BOX 555, GRAND JUNCTION, CO 81502-0555
PO BOX 556, GRAND JUNCTION, CO 81502-0556
PO BOX 557, GRAND JUNCTION, CO 81502-0557
PO BOX 558, GRAND JUNCTION, CO 81502-0558
PO BOX 559, GRAND JUNCTION, CO 81502-0559
PO BOX 560, GRAND JUNCTION, CO 81502-0560
PO BOX 561, GRAND JUNCTION, CO 81502-0561
PO BOX 562, GRAND JUNCTION, CO 81502-0562
PO BOX 563, GRAND JUNCTION, CO 81502-0563
PO BOX 564, GRAND JUNCTION, CO 81502-0564
PO BOX 565, GRAND JUNCTION, CO 81502-0565
PO BOX 566, GRAND JUNCTION, CO 81502-0566
PO BOX 567, GRAND JUNCTION, CO 81502-0567
PO BOX 568, GRAND JUNCTION, CO 81502-0568
PO BOX 569, GRAND JUNCTION, CO 81502-0569
PO BOX 570, GRAND JUNCTION, CO 81502-0570
PO BOX 571, GRAND JUNCTION, CO 81502-0571
PO BOX 572, GRAND JUNCTION, CO 81502-0572
PO BOX 573, GRAND JUNCTION, CO 81502-0573
PO BOX 574, GRAND JUNCTION, CO 81502-0574
PO BOX 575, GRAND JUNCTION, CO 81502-0575
PO BOX 576, GRAND JUNCTION, CO 81502-0576
PO BOX 577, GRAND JUNCTION, CO 81502-0577
PO BOX 578, GRAND JUNCTION, CO 81502-0578
PO BOX 579, GRAND JUNCTION, CO 81502-0579
PO BOX 580, GRAND JUNCTION, CO 81502-0580
PO BOX 581, GRAND JUNCTION, CO 81502-0581
PO BOX 582, GRAND JUNCTION, CO 81502-0582
PO BOX 583, GRAND JUNCTION, CO 81502-0583
PO BOX 584, GRAND JUNCTION, CO 81502-0584
PO BOX 585, GRAND JUNCTION, CO 81502-0585
PO BOX 586, GRAND JUNCTION, CO 81502-0586
PO BOX 587, GRAND JUNCTION, CO 81502-0587
PO BOX 588, GRAND JUNCTION, CO 81502-0588
PO BOX 589, GRAND JUNCTION, CO 81502-0589
PO BOX 590, GRAND JUNCTION, CO 81502-0590
PO BOX 591, GRAND JUNCTION, CO 81502-0591
PO BOX 592, GRAND JUNCTION, CO 81502-0592
PO BOX 593, GRAND JUNCTION, CO 81502-0593
PO BOX 594, GRAND JUNCTION, CO 81502-0594
PO BOX 595, GRAND JUNCTION, CO 81502-0595
PO BOX 596, GRAND JUNCTION, CO 81502-0596
PO BOX 597, GRAND JUNCTION, CO 81502-0597
PO BOX 598, GRAND JUNCTION, CO 81502-0598
PO BOX 599, GRAND JUNCTION, CO 81502-0599
PO BOX 600, GRAND JUNCTION, CO 81502-0600
PO BOX 601, GRAND JUNCTION, CO 81502-0601
PO BOX 602, GRAND JUNCTION, CO 81502-0602
PO BOX 603, GRAND JUNCTION, CO 81502-0603
PO BOX 604, GRAND JUNCTION, CO 81502-0604
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