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, IOWA CITY, IA 52244-0481
PO BOX 482, IOWA CITY, IA 52244-0482
PO BOX 483, IOWA CITY, IA 52244-0483
PO BOX 484, IOWA CITY, IA 52244-0484
PO BOX 485, IOWA CITY, IA 52244-0485
PO BOX 486, IOWA CITY, IA 52244-0486
PO BOX 487, IOWA CITY, IA 52244-0487
PO BOX 488, IOWA CITY, IA 52244-0488
PO BOX 489, IOWA CITY, IA 52244-0489
PO BOX 490, IOWA CITY, IA 52244-0490
PO BOX 491, IOWA CITY, IA 52244-0491
PO BOX 492, IOWA CITY, IA 52244-0492
PO BOX 493, IOWA CITY, IA 52244-0493
PO BOX 494, IOWA CITY, IA 52244-0494
PO BOX 495, IOWA CITY, IA 52244-0495
PO BOX 496, IOWA CITY, IA 52244-0496
PO BOX 497, IOWA CITY, IA 52244-0497
PO BOX 498, IOWA CITY, IA 52244-0498
PO BOX 499, IOWA CITY, IA 52244-0499
PO BOX 500, IOWA CITY, IA 52244-0500
PO BOX 501, IOWA CITY, IA 52244-0501
PO BOX 502, IOWA CITY, IA 52244-0502
PO BOX 503, IOWA CITY, IA 52244-0503
PO BOX 504, IOWA CITY, IA 52244-0504
PO BOX 505, IOWA CITY, IA 52244-0505
PO BOX 506, IOWA CITY, IA 52244-0506
PO BOX 507, IOWA CITY, IA 52244-0507
PO BOX 508, IOWA CITY, IA 52244-0508
PO BOX 509, IOWA CITY, IA 52244-0509
PO BOX 510, IOWA CITY, IA 52244-0510
PO BOX 511, IOWA CITY, IA 52244-0511
PO BOX 512, IOWA CITY, IA 52244-0512
PO BOX 513, IOWA CITY, IA 52244-0513
PO BOX 514, IOWA CITY, IA 52244-0514
PO BOX 515, IOWA CITY, IA 52244-0515
PO BOX 516, IOWA CITY, IA 52244-0516
PO BOX 517, IOWA CITY, IA 52244-0517
PO BOX 518, IOWA CITY, IA 52244-0518
PO BOX 519, IOWA CITY, IA 52244-0519
PO BOX 520, IOWA CITY, IA 52244-0520
PO BOX 521, IOWA CITY, IA 52244-0521
PO BOX 522, IOWA CITY, IA 52244-0522
PO BOX 523, IOWA CITY, IA 52244-0523
PO BOX 524, IOWA CITY, IA 52244-0524
PO BOX 525, IOWA CITY, IA 52244-0525
PO BOX 526, IOWA CITY, IA 52244-0526
PO BOX 527, IOWA CITY, IA 52244-0527
PO BOX 528, IOWA CITY, IA 52244-0528
PO BOX 529, IOWA CITY, IA 52244-0529
PO BOX 530, IOWA CITY, IA 52244-0530
PO BOX 531, IOWA CITY, IA 52244-0531
PO BOX 532, IOWA CITY, IA 52244-0532
PO BOX 533, IOWA CITY, IA 52244-0533
PO BOX 534, IOWA CITY, IA 52244-0534
PO BOX 535, IOWA CITY, IA 52244-0535
PO BOX 536, IOWA CITY, IA 52244-0536
PO BOX 537, IOWA CITY, IA 52244-0537
PO BOX 538, IOWA CITY, IA 52244-0538
PO BOX 539, IOWA CITY, IA 52244-0539
PO BOX 540, IOWA CITY, IA 52244-0540
PO BOX 541, IOWA CITY, IA 52244-0541
PO BOX 542, IOWA CITY, IA 52244-0542
PO BOX 543, IOWA CITY, IA 52244-0543
PO BOX 544, IOWA CITY, IA 52244-0544
PO BOX 545, IOWA CITY, IA 52244-0545
PO BOX 546, IOWA CITY, IA 52244-0546
PO BOX 547, IOWA CITY, IA 52244-0547
PO BOX 548, IOWA CITY, IA 52244-0548
PO BOX 549, IOWA CITY, IA 52244-0549
PO BOX 550, IOWA CITY, IA 52244-0550
PO BOX 551, IOWA CITY, IA 52244-0551
PO BOX 552, IOWA CITY, IA 52244-0552
PO BOX 553, IOWA CITY, IA 52244-0553
PO BOX 554, IOWA CITY, IA 52244-0554
PO BOX 555, IOWA CITY, IA 52244-0555
PO BOX 556, IOWA CITY, IA 52244-0556
PO BOX 557, IOWA CITY, IA 52244-0557
PO BOX 558, IOWA CITY, IA 52244-0558
PO BOX 559, IOWA CITY, IA 52244-0559
PO BOX 560, IOWA CITY, IA 52244-0560
PO BOX 561, IOWA CITY, IA 52244-0561
PO BOX 562, IOWA CITY, IA 52244-0562
PO BOX 563, IOWA CITY, IA 52244-0563
PO BOX 564, IOWA CITY, IA 52244-0564
PO BOX 565, IOWA CITY, IA 52244-0565
PO BOX 566, IOWA CITY, IA 52244-0566
PO BOX 567, IOWA CITY, IA 52244-0567
PO BOX 568, IOWA CITY, IA 52244-0568
PO BOX 569, IOWA CITY, IA 52244-0569
PO BOX 570, IOWA CITY, IA 52244-0570
PO BOX 571, IOWA CITY, IA 52244-0571
PO BOX 572, IOWA CITY, IA 52244-0572
PO BOX 573, IOWA CITY, IA 52244-0573
PO BOX 574, IOWA CITY, IA 52244-0574
PO BOX 575, IOWA CITY, IA 52244-0575
PO BOX 576, IOWA CITY, IA 52244-0576
PO BOX 577, IOWA CITY, IA 52244-0577
PO BOX 578, IOWA CITY, IA 52244-0578
PO BOX 579, IOWA CITY, IA 52244-0579
PO BOX 580, IOWA CITY, IA 52244-0580
PO BOX 581, IOWA CITY, IA 52244-0581
PO BOX 582, IOWA CITY, IA 52244-0582
PO BOX 583, IOWA CITY, IA 52244-0583
PO BOX 584, IOWA CITY, IA 52244-0584
PO BOX 585, IOWA CITY, IA 52244-0585
PO BOX 586, IOWA CITY, IA 52244-0586
PO BOX 587, IOWA CITY, IA 52244-0587
PO BOX 588, IOWA CITY, IA 52244-0588
PO BOX 589, IOWA CITY, IA 52244-0589
PO BOX 590, IOWA CITY, IA 52244-0590
PO BOX 591, IOWA CITY, IA 52244-0591
PO BOX 592, IOWA CITY, IA 52244-0592
PO BOX 593, IOWA CITY, IA 52244-0593
PO BOX 594, IOWA CITY, IA 52244-0594
PO BOX 595, IOWA CITY, IA 52244-0595
PO BOX 596, IOWA CITY, IA 52244-0596
PO BOX 597, IOWA CITY, IA 52244-0597
PO BOX 598, IOWA CITY, IA 52244-0598
PO BOX 599, IOWA CITY, IA 52244-0599
PO BOX 600, IOWA CITY, IA 52244-0600
PO BOX 601, IOWA CITY, IA 52244-0601
PO BOX 602, IOWA CITY, IA 52244-0602
PO BOX 603, IOWA CITY, IA 52244-0603
PO BOX 604, IOWA CITY, IA 52244-0604
PO BOX 605, IOWA CITY, IA 52244-0605
PO BOX 606, IOWA CITY, IA 52244-0606
PO BOX 607, IOWA CITY, IA 52244-0607
PO BOX 608, IOWA CITY, IA 52244-0608
PO BOX 609, IOWA CITY, IA 52244-0609
PO BOX 610, IOWA CITY, IA 52244-0610
PO BOX 611, IOWA CITY, IA 52244-0611
PO BOX 612, IOWA CITY, IA 52244-0612
PO BOX 613, IOWA CITY, IA 52244-0613
PO BOX 614, IOWA CITY, IA 52244-0614
PO BOX 615, IOWA CITY, IA 52244-0615
PO BOX 616, IOWA CITY, IA 52244-0616
PO BOX 617, IOWA CITY, IA 52244-0617
PO BOX 618, IOWA CITY, IA 52244-0618
PO BOX 619, IOWA CITY, IA 52244-0619
PO BOX 620, IOWA CITY, IA 52244-0620
PO BOX 621, IOWA CITY, IA 52244-0621
PO BOX 622, IOWA CITY, IA 52244-0622
PO BOX 623, IOWA CITY, IA 52244-0623
PO BOX 624, IOWA CITY, IA 52244-0624
PO BOX 625, IOWA CITY, IA 52244-0625
PO BOX 626, IOWA CITY, IA 52244-0626
PO BOX 627, IOWA CITY, IA 52244-0627
PO BOX 628, IOWA CITY, IA 52244-0628
PO BOX 629, IOWA CITY, IA 52244-0629
PO BOX 630, IOWA CITY, IA 52244-0630
PO BOX 631, IOWA CITY, IA 52244-0631
PO BOX 632, IOWA CITY, IA 52244-0632
PO BOX 633, IOWA CITY, IA 52244-0633
PO BOX 634, IOWA CITY, IA 52244-0634
PO BOX 635, IOWA CITY, IA 52244-0635
PO BOX 636, IOWA CITY, IA 52244-0636
PO BOX 637, IOWA CITY, IA 52244-0637
PO BOX 638, IOWA CITY, IA 52244-0638
PO BOX 639, IOWA CITY, IA 52244-0639
PO BOX 640, IOWA CITY, IA 52244-0640
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