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, ALBIA, IA 52531-0421
PO BOX 422, ALBIA, IA 52531-0422
PO BOX 423, ALBIA, IA 52531-0423
PO BOX 424, ALBIA, IA 52531-0424
PO BOX 425, ALBIA, IA 52531-0425
PO BOX 426, ALBIA, IA 52531-0426
PO BOX 427, ALBIA, IA 52531-0427
PO BOX 428, ALBIA, IA 52531-0428
PO BOX 429, ALBIA, IA 52531-0429
PO BOX 430, ALBIA, IA 52531-0430
PO BOX 431, ALBIA, IA 52531-0431
PO BOX 432, ALBIA, IA 52531-0432
PO BOX 433, ALBIA, IA 52531-0433
PO BOX 434, ALBIA, IA 52531-0434
PO BOX 435, ALBIA, IA 52531-0435
PO BOX 436, ALBIA, IA 52531-0436
PO BOX 437, ALBIA, IA 52531-0437
PO BOX 438, ALBIA, IA 52531-0438
PO BOX 439, ALBIA, IA 52531-0439
PO BOX 440, ALBIA, IA 52531-0440
PO BOX 441, ALBIA, IA 52531-0441
PO BOX 442, ALBIA, IA 52531-0442
PO BOX 443, ALBIA, IA 52531-0443
PO BOX 444, ALBIA, IA 52531-0444
PO BOX 445, ALBIA, IA 52531-0445
PO BOX 446, ALBIA, IA 52531-0446
PO BOX 447, ALBIA, IA 52531-0447
PO BOX 448, ALBIA, IA 52531-0448
PO BOX 449, ALBIA, IA 52531-0449
PO BOX 450, ALBIA, IA 52531-0450
PO BOX 451, ALBIA, IA 52531-0451
PO BOX 452, ALBIA, IA 52531-0452
PO BOX 453, ALBIA, IA 52531-0453
PO BOX 454, ALBIA, IA 52531-0454
PO BOX 455, ALBIA, IA 52531-0455
PO BOX 456, ALBIA, IA 52531-0456
PO BOX 457, ALBIA, IA 52531-0457
PO BOX 458, ALBIA, IA 52531-0458
PO BOX 459, ALBIA, IA 52531-0459
PO BOX 460, ALBIA, IA 52531-0460
PO BOX 461, ALBIA, IA 52531-0461
PO BOX 462, ALBIA, IA 52531-0462
PO BOX 463, ALBIA, IA 52531-0463
PO BOX 464, ALBIA, IA 52531-0464
PO BOX 465, ALBIA, IA 52531-0465
PO BOX 466, ALBIA, IA 52531-0466
PO BOX 467, ALBIA, IA 52531-0467
PO BOX 468, ALBIA, IA 52531-0468
PO BOX 469, ALBIA, IA 52531-0469
PO BOX 470, ALBIA, IA 52531-0470
PO BOX 471, ALBIA, IA 52531-0471
PO BOX 472, ALBIA, IA 52531-0472
PO BOX 473, ALBIA, IA 52531-0473
PO BOX 474, ALBIA, IA 52531-0474
PO BOX 475, ALBIA, IA 52531-0475
PO BOX 476, ALBIA, IA 52531-0476
PO BOX 477, ALBIA, IA 52531-0477
PO BOX 478, ALBIA, IA 52531-0478
PO BOX 479, ALBIA, IA 52531-0479
PO BOX 480, ALBIA, IA 52531-0480
PO BOX 481, ALBIA, IA 52531-0481
PO BOX 482, ALBIA, IA 52531-0482
PO BOX 483, ALBIA, IA 52531-0483
PO BOX 484, ALBIA, IA 52531-0484
PO BOX 485, ALBIA, IA 52531-0485
PO BOX 486, ALBIA, IA 52531-0486
PO BOX 487, ALBIA, IA 52531-0487
PO BOX 488, ALBIA, IA 52531-0488
PO BOX 489, ALBIA, IA 52531-0489
PO BOX 490, ALBIA, IA 52531-0490
PO BOX 491, ALBIA, IA 52531-0491
PO BOX 492, ALBIA, IA 52531-0492
PO BOX 493, ALBIA, IA 52531-0493
PO BOX 494, ALBIA, IA 52531-0494
PO BOX 495, ALBIA, IA 52531-0495
PO BOX 496, ALBIA, IA 52531-0496
PO BOX 497, ALBIA, IA 52531-0497
PO BOX 498, ALBIA, IA 52531-0498
PO BOX 499, ALBIA, IA 52531-0499
PO BOX 500, ALBIA, IA 52531-0500
PO BOX 501, ALBIA, IA 52531-0501
PO BOX 502, ALBIA, IA 52531-0502
PO BOX 503, ALBIA, IA 52531-0503
PO BOX 504, ALBIA, IA 52531-0504
PO BOX 505, ALBIA, IA 52531-0505
PO BOX 506, ALBIA, IA 52531-0506
PO BOX 507, ALBIA, IA 52531-0507
PO BOX 508, ALBIA, IA 52531-0508
PO BOX 509, ALBIA, IA 52531-0509
PO BOX 510, ALBIA, IA 52531-0510
PO BOX 511, ALBIA, IA 52531-0511
PO BOX 512, ALBIA, IA 52531-0512
PO BOX 513, ALBIA, IA 52531-0513
PO BOX 514, ALBIA, IA 52531-0514
PO BOX 515, ALBIA, IA 52531-0515
PO BOX 516, ALBIA, IA 52531-0516
PO BOX 517, ALBIA, IA 52531-0517
PO BOX 518, ALBIA, IA 52531-0518
PO BOX 519, ALBIA, IA 52531-0519
PO BOX 520, ALBIA, IA 52531-0520
PO BOX 521, ALBIA, IA 52531-0521
PO BOX 522, ALBIA, IA 52531-0522
PO BOX 523, ALBIA, IA 52531-0523
PO BOX 524, ALBIA, IA 52531-0524
PO BOX 525, ALBIA, IA 52531-0525
PO BOX 526, ALBIA, IA 52531-0526
PO BOX 527, ALBIA, IA 52531-0527
PO BOX 528, ALBIA, IA 52531-0528
PO BOX 529, ALBIA, IA 52531-0529
PO BOX 530, ALBIA, IA 52531-0530
PO BOX 531, ALBIA, IA 52531-0531
PO BOX 532, ALBIA, IA 52531-0532
PO BOX 533, ALBIA, IA 52531-0533
PO BOX 534, ALBIA, IA 52531-0534
PO BOX 535, ALBIA, IA 52531-0535
PO BOX 536, ALBIA, IA 52531-0536
PO BOX 537, ALBIA, IA 52531-0537
PO BOX 538, ALBIA, IA 52531-0538
PO BOX 539, ALBIA, IA 52531-0539
PO BOX 540, ALBIA, IA 52531-0540
PO BOX 541, ALBIA, IA 52531-0541
PO BOX 542, ALBIA, IA 52531-0542
PO BOX 543, ALBIA, IA 52531-0543
PO BOX 544, ALBIA, IA 52531-0544
PO BOX 545, ALBIA, IA 52531-0545
PO BOX 546, ALBIA, IA 52531-0546
PO BOX 547, ALBIA, IA 52531-0547
PO BOX 548, ALBIA, IA 52531-0548
PO BOX 549, ALBIA, IA 52531-0549
PO BOX 550, ALBIA, IA 52531-0550
PO BOX 551, ALBIA, IA 52531-0551
PO BOX 552, ALBIA, IA 52531-0552
PO BOX 553, ALBIA, IA 52531-0553
PO BOX 554, ALBIA, IA 52531-0554
PO BOX 555, ALBIA, IA 52531-0555
PO BOX 556, ALBIA, IA 52531-0556
PO BOX 557, ALBIA, IA 52531-0557
PO BOX 558, ALBIA, IA 52531-0558
PO BOX 559, ALBIA, IA 52531-0559
PO BOX 560, ALBIA, IA 52531-0560
PO BOX 561, ALBIA, IA 52531-0561
PO BOX 562, ALBIA, IA 52531-0562
PO BOX 563, ALBIA, IA 52531-0563
PO BOX 564, ALBIA, IA 52531-0564
PO BOX 565, ALBIA, IA 52531-0565
PO BOX 566, ALBIA, IA 52531-0566
PO BOX 567, ALBIA, IA 52531-0567
PO BOX 568, ALBIA, IA 52531-0568
PO BOX 569, ALBIA, IA 52531-0569
PO BOX 570, ALBIA, IA 52531-0570
PO BOX 571, ALBIA, IA 52531-0571
PO BOX 572, ALBIA, IA 52531-0572
PO BOX 573, ALBIA, IA 52531-0573
PO BOX 574, ALBIA, IA 52531-0574
PO BOX 575, ALBIA, IA 52531-0575
PO BOX 576, ALBIA, IA 52531-0576
PO BOX 577, ALBIA, IA 52531-0577
PO BOX 578, ALBIA, IA 52531-0578
PO BOX 579, ALBIA, IA 52531-0579
PO BOX 580, ALBIA, IA 52531-0580
PO BOX 581, ALBIA, IA 52531-0581
PO BOX 582, ALBIA, IA 52531-0582
PO BOX 583, ALBIA, IA 52531-0583
PO BOX 584, ALBIA, IA 52531-0584
PO BOX 585, ALBIA, IA 52531-0585
PO BOX 586, ALBIA, IA 52531-0586
PO BOX 587, ALBIA, IA 52531-0587
PO BOX 588, ALBIA, IA 52531-0588
PO BOX 589, ALBIA, IA 52531-0589
PO BOX 590, ALBIA, IA 52531-0590
PO BOX 591, ALBIA, IA 52531-0591
PO BOX 592, ALBIA, IA 52531-0592
PO BOX 593, ALBIA, IA 52531-0593
PO BOX 594, ALBIA, IA 52531-0594
PO BOX 595, ALBIA, IA 52531-0595
PO BOX 596, ALBIA, IA 52531-0596
PO BOX 597, ALBIA, IA 52531-0597
PO BOX 598, ALBIA, IA 52531-0598
PO BOX 599, ALBIA, IA 52531-0599
PO BOX 600, ALBIA, IA 52531-0600
PO BOX 601, ALBIA, IA 52531-0601
PO BOX 602, ALBIA, IA 52531-0602
PO BOX 603, ALBIA, IA 52531-0603
PO BOX 604, ALBIA, IA 52531-0604
PO BOX 605, ALBIA, IA 52531-0605
PO BOX 606, ALBIA, IA 52531-0606
PO BOX 607, ALBIA, IA 52531-0607
PO BOX 608, ALBIA, IA 52531-0608
PO BOX 609, ALBIA, IA 52531-0609
PO BOX 610, ALBIA, IA 52531-0610
PO BOX 611, ALBIA, IA 52531-0611
PO BOX 612, ALBIA, IA 52531-0612
PO BOX 613, ALBIA, IA 52531-0613
PO BOX 614, ALBIA, IA 52531-0614
PO BOX 615, ALBIA, IA 52531-0615
PO BOX 616, ALBIA, IA 52531-0616
PO BOX 617, ALBIA, IA 52531-0617
PO BOX 618, ALBIA, IA 52531-0618
PO BOX 619, ALBIA, IA 52531-0619
PO BOX 620, ALBIA, IA 52531-0620
PO BOX 621, ALBIA, IA 52531-0621
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