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 421, HORSESHOE BEND, ID 83629-0421
PO BOX 422, HORSESHOE BEND, ID 83629-0422
PO BOX 423, HORSESHOE BEND, ID 83629-0423
PO BOX 424, HORSESHOE BEND, ID 83629-0424
PO BOX 425, HORSESHOE BEND, ID 83629-0425
PO BOX 426, HORSESHOE BEND, ID 83629-0426
PO BOX 427, HORSESHOE BEND, ID 83629-0427
PO BOX 428, HORSESHOE BEND, ID 83629-0428
PO BOX 429, HORSESHOE BEND, ID 83629-0429
PO BOX 430, HORSESHOE BEND, ID 83629-0430
PO BOX 431, HORSESHOE BEND, ID 83629-0431
PO BOX 432, HORSESHOE BEND, ID 83629-0432
PO BOX 433, HORSESHOE BEND, ID 83629-0433
PO BOX 434, HORSESHOE BEND, ID 83629-0434
PO BOX 435, HORSESHOE BEND, ID 83629-0435
PO BOX 436, HORSESHOE BEND, ID 83629-0436
PO BOX 437, HORSESHOE BEND, ID 83629-0437
PO BOX 438, HORSESHOE BEND, ID 83629-0438
PO BOX 439, HORSESHOE BEND, ID 83629-0439
PO BOX 440, HORSESHOE BEND, ID 83629-0440
PO BOX 441, HORSESHOE BEND, ID 83629-0441
PO BOX 442, HORSESHOE BEND, ID 83629-0442
PO BOX 443, HORSESHOE BEND, ID 83629-0443
PO BOX 444, HORSESHOE BEND, ID 83629-0444
PO BOX 445, HORSESHOE BEND, ID 83629-0445
PO BOX 446, HORSESHOE BEND, ID 83629-0446
PO BOX 447, HORSESHOE BEND, ID 83629-0447
PO BOX 448, HORSESHOE BEND, ID 83629-0448
PO BOX 449, HORSESHOE BEND, ID 83629-0449
PO BOX 450, HORSESHOE BEND, ID 83629-0450
PO BOX 451, HORSESHOE BEND, ID 83629-0451
PO BOX 452, HORSESHOE BEND, ID 83629-0452
PO BOX 453, HORSESHOE BEND, ID 83629-0453
PO BOX 454, HORSESHOE BEND, ID 83629-0454
PO BOX 455, HORSESHOE BEND, ID 83629-0455
PO BOX 456, HORSESHOE BEND, ID 83629-0456
PO BOX 457, HORSESHOE BEND, ID 83629-0457
PO BOX 458, HORSESHOE BEND, ID 83629-0458
PO BOX 459, HORSESHOE BEND, ID 83629-0459
PO BOX 460, HORSESHOE BEND, ID 83629-0460
PO BOX 461, HORSESHOE BEND, ID 83629-0461
PO BOX 462, HORSESHOE BEND, ID 83629-0462
PO BOX 463, HORSESHOE BEND, ID 83629-0463
PO BOX 464, HORSESHOE BEND, ID 83629-0464
PO BOX 465, HORSESHOE BEND, ID 83629-0465
PO BOX 466, HORSESHOE BEND, ID 83629-0466
PO BOX 467, HORSESHOE BEND, ID 83629-0467
PO BOX 468, HORSESHOE BEND, ID 83629-0468
PO BOX 469, HORSESHOE BEND, ID 83629-0469
PO BOX 470, HORSESHOE BEND, ID 83629-0470
PO BOX 471, HORSESHOE BEND, ID 83629-0471
PO BOX 472, HORSESHOE BEND, ID 83629-0472
PO BOX 473, HORSESHOE BEND, ID 83629-0473
PO BOX 474, HORSESHOE BEND, ID 83629-0474
PO BOX 475, HORSESHOE BEND, ID 83629-0475
PO BOX 476, HORSESHOE BEND, ID 83629-0476
PO BOX 477, HORSESHOE BEND, ID 83629-0477
PO BOX 478, HORSESHOE BEND, ID 83629-0478
PO BOX 479, HORSESHOE BEND, ID 83629-0479
PO BOX 480, HORSESHOE BEND, ID 83629-0480
PO BOX 481, HORSESHOE BEND, ID 83629-0481
PO BOX 482, HORSESHOE BEND, ID 83629-0482
PO BOX 483, HORSESHOE BEND, ID 83629-0483
PO BOX 484, HORSESHOE BEND, ID 83629-0484
PO BOX 485, HORSESHOE BEND, ID 83629-0485
PO BOX 486, HORSESHOE BEND, ID 83629-0486
PO BOX 487, HORSESHOE BEND, ID 83629-0487
PO BOX 488, HORSESHOE BEND, ID 83629-0488
PO BOX 489, HORSESHOE BEND, ID 83629-0489
PO BOX 490, HORSESHOE BEND, ID 83629-0490
PO BOX 491, HORSESHOE BEND, ID 83629-0491
PO BOX 492, HORSESHOE BEND, ID 83629-0492
PO BOX 493, HORSESHOE BEND, ID 83629-0493
PO BOX 494, HORSESHOE BEND, ID 83629-0494
PO BOX 495, HORSESHOE BEND, ID 83629-0495
PO BOX 496, HORSESHOE BEND, ID 83629-0496
PO BOX 497, HORSESHOE BEND, ID 83629-0497
PO BOX 498, HORSESHOE BEND, ID 83629-0498
PO BOX 499, HORSESHOE BEND, ID 83629-0499
PO BOX 500, HORSESHOE BEND, ID 83629-0500
PO BOX 501, HORSESHOE BEND, ID 83629-0501
PO BOX 502, HORSESHOE BEND, ID 83629-0502
PO BOX 503, HORSESHOE BEND, ID 83629-0503
PO BOX 504, HORSESHOE BEND, ID 83629-0504
PO BOX 505, HORSESHOE BEND, ID 83629-0505
PO BOX 506, HORSESHOE BEND, ID 83629-0506
PO BOX 507, HORSESHOE BEND, ID 83629-0507
PO BOX 508, HORSESHOE BEND, ID 83629-0508
PO BOX 509, HORSESHOE BEND, ID 83629-0509
PO BOX 510, HORSESHOE BEND, ID 83629-0510
PO BOX 511, HORSESHOE BEND, ID 83629-0511
PO BOX 512, HORSESHOE BEND, ID 83629-0512
PO BOX 513, HORSESHOE BEND, ID 83629-0513
PO BOX 514, HORSESHOE BEND, ID 83629-0514
PO BOX 515, HORSESHOE BEND, ID 83629-0515
PO BOX 516, HORSESHOE BEND, ID 83629-0516
PO BOX 517, HORSESHOE BEND, ID 83629-0517
PO BOX 518, HORSESHOE BEND, ID 83629-0518
PO BOX 519, HORSESHOE BEND, ID 83629-0519
PO BOX 520, HORSESHOE BEND, ID 83629-0520
PO BOX 521, HORSESHOE BEND, ID 83629-0521
PO BOX 522, HORSESHOE BEND, ID 83629-0522
PO BOX 523, HORSESHOE BEND, ID 83629-0523
PO BOX 524, HORSESHOE BEND, ID 83629-0524
PO BOX 525, HORSESHOE BEND, ID 83629-0525
PO BOX 526, HORSESHOE BEND, ID 83629-0526
PO BOX 527, HORSESHOE BEND, ID 83629-0527
PO BOX 528, HORSESHOE BEND, ID 83629-0528
PO BOX 529, HORSESHOE BEND, ID 83629-0529
PO BOX 530, HORSESHOE BEND, ID 83629-0530
PO BOX 531, HORSESHOE BEND, ID 83629-0531
PO BOX 532, HORSESHOE BEND, ID 83629-0532
PO BOX 533, HORSESHOE BEND, ID 83629-0533
PO BOX 534, HORSESHOE BEND, ID 83629-0534
PO BOX 535, HORSESHOE BEND, ID 83629-0535
PO BOX 536, HORSESHOE BEND, ID 83629-0536
PO BOX 537, HORSESHOE BEND, ID 83629-0537
PO BOX 538, HORSESHOE BEND, ID 83629-0538
PO BOX 539, HORSESHOE BEND, ID 83629-0539
PO BOX 540, HORSESHOE BEND, ID 83629-0540
PO BOX 541, HORSESHOE BEND, ID 83629-0541
PO BOX 542, HORSESHOE BEND, ID 83629-0542
PO BOX 543, HORSESHOE BEND, ID 83629-0543
PO BOX 544, HORSESHOE BEND, ID 83629-0544
PO BOX 545, HORSESHOE BEND, ID 83629-0545
PO BOX 546, HORSESHOE BEND, ID 83629-0546
PO BOX 547, HORSESHOE BEND, ID 83629-0547
PO BOX 548, HORSESHOE BEND, ID 83629-0548
PO BOX 549, HORSESHOE BEND, ID 83629-0549
PO BOX 550, HORSESHOE BEND, ID 83629-0550
PO BOX 551, HORSESHOE BEND, ID 83629-0551
PO BOX 552, HORSESHOE BEND, ID 83629-0552
PO BOX 553, HORSESHOE BEND, ID 83629-0553
PO BOX 554, HORSESHOE BEND, ID 83629-0554
PO BOX 555, HORSESHOE BEND, ID 83629-0555
PO BOX 556, HORSESHOE BEND, ID 83629-0556
PO BOX 557, HORSESHOE BEND, ID 83629-0557
PO BOX 558, HORSESHOE BEND, ID 83629-0558
PO BOX 559, HORSESHOE BEND, ID 83629-0559
PO BOX 560, HORSESHOE BEND, ID 83629-0560
PO BOX 561, HORSESHOE BEND, ID 83629-0561
PO BOX 562, HORSESHOE BEND, ID 83629-0562
PO BOX 563, HORSESHOE BEND, ID 83629-0563
PO BOX 564, HORSESHOE BEND, ID 83629-0564
PO BOX 565, HORSESHOE BEND, ID 83629-0565
PO BOX 566, HORSESHOE BEND, ID 83629-0566
PO BOX 567, HORSESHOE BEND, ID 83629-0567
PO BOX 568, HORSESHOE BEND, ID 83629-0568
PO BOX 569, HORSESHOE BEND, ID 83629-0569
PO BOX 570, HORSESHOE BEND, ID 83629-0570
PO BOX 571, HORSESHOE BEND, ID 83629-0571
PO BOX 572, HORSESHOE BEND, ID 83629-0572
PO BOX 573, HORSESHOE BEND, ID 83629-0573
PO BOX 574, HORSESHOE BEND, ID 83629-0574
PO BOX 575, HORSESHOE BEND, ID 83629-0575
PO BOX 576, HORSESHOE BEND, ID 83629-0576
PO BOX 577, HORSESHOE BEND, ID 83629-0577
PO BOX 578, HORSESHOE BEND, ID 83629-0578
PO BOX 579, HORSESHOE BEND, ID 83629-0579
PO BOX 580, HORSESHOE BEND, ID 83629-0580
PO BOX 581, HORSESHOE BEND, ID 83629-0581
PO BOX 582, HORSESHOE BEND, ID 83629-0582
PO BOX 583, HORSESHOE BEND, ID 83629-0583
PO BOX 584, HORSESHOE BEND, ID 83629-0584
PO BOX 585, HORSESHOE BEND, ID 83629-0585
PO BOX 586, HORSESHOE BEND, ID 83629-0586
PO BOX 587, HORSESHOE BEND, ID 83629-0587
PO BOX 588, HORSESHOE BEND, ID 83629-0588
PO BOX 589, HORSESHOE BEND, ID 83629-0589
PO BOX 590, HORSESHOE BEND, ID 83629-0590
PO BOX 591, HORSESHOE BEND, ID 83629-0591
PO BOX 592, HORSESHOE BEND, ID 83629-0592
PO BOX 593, HORSESHOE BEND, ID 83629-0593
PO BOX 594, HORSESHOE BEND, ID 83629-0594
PO BOX 595, HORSESHOE BEND, ID 83629-0595
PO BOX 596, HORSESHOE BEND, ID 83629-0596
PO BOX 597, HORSESHOE BEND, ID 83629-0597
PO BOX 598, HORSESHOE BEND, ID 83629-0598
PO BOX 599, HORSESHOE BEND, ID 83629-0599
PO BOX 600, HORSESHOE BEND, ID 83629-0600
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