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, NORTH LITTLE ROCK, AR 72115-0481
PO BOX 482, NORTH LITTLE ROCK, AR 72115-0482
PO BOX 483, NORTH LITTLE ROCK, AR 72115-0483
PO BOX 484, NORTH LITTLE ROCK, AR 72115-0484
PO BOX 485, NORTH LITTLE ROCK, AR 72115-0485
PO BOX 486, NORTH LITTLE ROCK, AR 72115-0486
PO BOX 487, NORTH LITTLE ROCK, AR 72115-0487
PO BOX 488, NORTH LITTLE ROCK, AR 72115-0488
PO BOX 489, NORTH LITTLE ROCK, AR 72115-0489
PO BOX 490, NORTH LITTLE ROCK, AR 72115-0490
PO BOX 491, NORTH LITTLE ROCK, AR 72115-0491
PO BOX 492, NORTH LITTLE ROCK, AR 72115-0492
PO BOX 493, NORTH LITTLE ROCK, AR 72115-0493
PO BOX 494, NORTH LITTLE ROCK, AR 72115-0494
PO BOX 495, NORTH LITTLE ROCK, AR 72115-0495
PO BOX 496, NORTH LITTLE ROCK, AR 72115-0496
PO BOX 497, NORTH LITTLE ROCK, AR 72115-0497
PO BOX 498, NORTH LITTLE ROCK, AR 72115-0498
PO BOX 499, NORTH LITTLE ROCK, AR 72115-0499
PO BOX 500, NORTH LITTLE ROCK, AR 72115-0500
PO BOX 501, NORTH LITTLE ROCK, AR 72115-0501
PO BOX 502, NORTH LITTLE ROCK, AR 72115-0502
PO BOX 503, NORTH LITTLE ROCK, AR 72115-0503
PO BOX 504, NORTH LITTLE ROCK, AR 72115-0504
PO BOX 505, NORTH LITTLE ROCK, AR 72115-0505
PO BOX 506, NORTH LITTLE ROCK, AR 72115-0506
PO BOX 507, NORTH LITTLE ROCK, AR 72115-0507
PO BOX 508, NORTH LITTLE ROCK, AR 72115-0508
PO BOX 509, NORTH LITTLE ROCK, AR 72115-0509
PO BOX 510, NORTH LITTLE ROCK, AR 72115-0510
PO BOX 511, NORTH LITTLE ROCK, AR 72115-0511
PO BOX 512, NORTH LITTLE ROCK, AR 72115-0512
PO BOX 513, NORTH LITTLE ROCK, AR 72115-0513
PO BOX 514, NORTH LITTLE ROCK, AR 72115-0514
PO BOX 515, NORTH LITTLE ROCK, AR 72115-0515
PO BOX 516, NORTH LITTLE ROCK, AR 72115-0516
PO BOX 517, NORTH LITTLE ROCK, AR 72115-0517
PO BOX 518, NORTH LITTLE ROCK, AR 72115-0518
PO BOX 519, NORTH LITTLE ROCK, AR 72115-0519
PO BOX 520, NORTH LITTLE ROCK, AR 72115-0520
PO BOX 521, NORTH LITTLE ROCK, AR 72115-0521
PO BOX 522, NORTH LITTLE ROCK, AR 72115-0522
PO BOX 523, NORTH LITTLE ROCK, AR 72115-0523
PO BOX 524, NORTH LITTLE ROCK, AR 72115-0524
PO BOX 525, NORTH LITTLE ROCK, AR 72115-0525
PO BOX 526, NORTH LITTLE ROCK, AR 72115-0526
PO BOX 527, NORTH LITTLE ROCK, AR 72115-0527
PO BOX 528, NORTH LITTLE ROCK, AR 72115-0528
PO BOX 529, NORTH LITTLE ROCK, AR 72115-0529
PO BOX 530, NORTH LITTLE ROCK, AR 72115-0530
PO BOX 531, NORTH LITTLE ROCK, AR 72115-0531
PO BOX 532, NORTH LITTLE ROCK, AR 72115-0532
PO BOX 533, NORTH LITTLE ROCK, AR 72115-0533
PO BOX 534, NORTH LITTLE ROCK, AR 72115-0534
PO BOX 535, NORTH LITTLE ROCK, AR 72115-0535
PO BOX 536, NORTH LITTLE ROCK, AR 72115-0536
PO BOX 537, NORTH LITTLE ROCK, AR 72115-0537
PO BOX 538, NORTH LITTLE ROCK, AR 72115-0538
PO BOX 539, NORTH LITTLE ROCK, AR 72115-0539
PO BOX 540, NORTH LITTLE ROCK, AR 72115-0540
PO BOX 541, NORTH LITTLE ROCK, AR 72115-0541
PO BOX 542, NORTH LITTLE ROCK, AR 72115-0542
PO BOX 543, NORTH LITTLE ROCK, AR 72115-0543
PO BOX 544, NORTH LITTLE ROCK, AR 72115-0544
PO BOX 545, NORTH LITTLE ROCK, AR 72115-0545
PO BOX 546, NORTH LITTLE ROCK, AR 72115-0546
PO BOX 547, NORTH LITTLE ROCK, AR 72115-0547
PO BOX 548, NORTH LITTLE ROCK, AR 72115-0548
PO BOX 549, NORTH LITTLE ROCK, AR 72115-0549
PO BOX 550, NORTH LITTLE ROCK, AR 72115-0550
PO BOX 551, NORTH LITTLE ROCK, AR 72115-0551
PO BOX 552, NORTH LITTLE ROCK, AR 72115-0552
PO BOX 553, NORTH LITTLE ROCK, AR 72115-0553
PO BOX 554, NORTH LITTLE ROCK, AR 72115-0554
PO BOX 555, NORTH LITTLE ROCK, AR 72115-0555
PO BOX 556, NORTH LITTLE ROCK, AR 72115-0556
PO BOX 557, NORTH LITTLE ROCK, AR 72115-0557
PO BOX 558, NORTH LITTLE ROCK, AR 72115-0558
PO BOX 559, NORTH LITTLE ROCK, AR 72115-0559
PO BOX 560, NORTH LITTLE ROCK, AR 72115-0560
PO BOX 561, NORTH LITTLE ROCK, AR 72115-0561
PO BOX 562, NORTH LITTLE ROCK, AR 72115-0562
PO BOX 563, NORTH LITTLE ROCK, AR 72115-0563
PO BOX 564, NORTH LITTLE ROCK, AR 72115-0564
PO BOX 565, NORTH LITTLE ROCK, AR 72115-0565
PO BOX 566, NORTH LITTLE ROCK, AR 72115-0566
PO BOX 567, NORTH LITTLE ROCK, AR 72115-0567
PO BOX 568, NORTH LITTLE ROCK, AR 72115-0568
PO BOX 569, NORTH LITTLE ROCK, AR 72115-0569
PO BOX 570, NORTH LITTLE ROCK, AR 72115-0570
PO BOX 571, NORTH LITTLE ROCK, AR 72115-0571
PO BOX 572, NORTH LITTLE ROCK, AR 72115-0572
PO BOX 573, NORTH LITTLE ROCK, AR 72115-0573
PO BOX 574, NORTH LITTLE ROCK, AR 72115-0574
PO BOX 575, NORTH LITTLE ROCK, AR 72115-0575
PO BOX 576, NORTH LITTLE ROCK, AR 72115-0576
PO BOX 577, NORTH LITTLE ROCK, AR 72115-0577
PO BOX 578, NORTH LITTLE ROCK, AR 72115-0578
PO BOX 579, NORTH LITTLE ROCK, AR 72115-0579
PO BOX 580, NORTH LITTLE ROCK, AR 72115-0580
PO BOX 581, NORTH LITTLE ROCK, AR 72115-0581
PO BOX 582, NORTH LITTLE ROCK, AR 72115-0582
PO BOX 583, NORTH LITTLE ROCK, AR 72115-0583
PO BOX 584, NORTH LITTLE ROCK, AR 72115-0584
PO BOX 585, NORTH LITTLE ROCK, AR 72115-0585
PO BOX 586, NORTH LITTLE ROCK, AR 72115-0586
PO BOX 587, NORTH LITTLE ROCK, AR 72115-0587
PO BOX 588, NORTH LITTLE ROCK, AR 72115-0588
PO BOX 589, NORTH LITTLE ROCK, AR 72115-0589
PO BOX 590, NORTH LITTLE ROCK, AR 72115-0590
PO BOX 591, NORTH LITTLE ROCK, AR 72115-0591
PO BOX 592, NORTH LITTLE ROCK, AR 72115-0592
PO BOX 593, NORTH LITTLE ROCK, AR 72115-0593
PO BOX 594, NORTH LITTLE ROCK, AR 72115-0594
PO BOX 595, NORTH LITTLE ROCK, AR 72115-0595
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