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 541, CHICAGO HEIGHTS, IL 60412-0541
PO BOX 542, CHICAGO HEIGHTS, IL 60412-0542
PO BOX 543, CHICAGO HEIGHTS, IL 60412-0543
PO BOX 544, CHICAGO HEIGHTS, IL 60412-0544
PO BOX 545, CHICAGO HEIGHTS, IL 60412-0545
PO BOX 546, CHICAGO HEIGHTS, IL 60412-0546
PO BOX 547, CHICAGO HEIGHTS, IL 60412-0547
PO BOX 548, CHICAGO HEIGHTS, IL 60412-0548
PO BOX 549, CHICAGO HEIGHTS, IL 60412-0549
PO BOX 550, CHICAGO HEIGHTS, IL 60412-0550
PO BOX 551, CHICAGO HEIGHTS, IL 60412-0551
PO BOX 552, CHICAGO HEIGHTS, IL 60412-0552
PO BOX 553, CHICAGO HEIGHTS, IL 60412-0553
PO BOX 554, CHICAGO HEIGHTS, IL 60412-0554
PO BOX 555, CHICAGO HEIGHTS, IL 60412-0555
PO BOX 556, CHICAGO HEIGHTS, IL 60412-0556
PO BOX 557, CHICAGO HEIGHTS, IL 60412-0557
PO BOX 558, CHICAGO HEIGHTS, IL 60412-0558
PO BOX 559, CHICAGO HEIGHTS, IL 60412-0559
PO BOX 560, CHICAGO HEIGHTS, IL 60412-0560
PO BOX 561, CHICAGO HEIGHTS, IL 60412-0561
PO BOX 562, CHICAGO HEIGHTS, IL 60412-0562
PO BOX 563, CHICAGO HEIGHTS, IL 60412-0563
PO BOX 564, CHICAGO HEIGHTS, IL 60412-0564
PO BOX 565, CHICAGO HEIGHTS, IL 60412-0565
PO BOX 566, CHICAGO HEIGHTS, IL 60412-0566
PO BOX 567, CHICAGO HEIGHTS, IL 60412-0567
PO BOX 568, CHICAGO HEIGHTS, IL 60412-0568
PO BOX 569, CHICAGO HEIGHTS, IL 60412-0569
PO BOX 570, CHICAGO HEIGHTS, IL 60412-0570
PO BOX 571, CHICAGO HEIGHTS, IL 60412-0571
PO BOX 572, CHICAGO HEIGHTS, IL 60412-0572
PO BOX 573, CHICAGO HEIGHTS, IL 60412-0573
PO BOX 574, CHICAGO HEIGHTS, IL 60412-0574
PO BOX 575, CHICAGO HEIGHTS, IL 60412-0575
PO BOX 576, CHICAGO HEIGHTS, IL 60412-0576
PO BOX 577, CHICAGO HEIGHTS, IL 60412-0577
PO BOX 578, CHICAGO HEIGHTS, IL 60412-0578
PO BOX 579, CHICAGO HEIGHTS, IL 60412-0579
PO BOX 580, CHICAGO HEIGHTS, IL 60412-0580
PO BOX 581, CHICAGO HEIGHTS, IL 60412-0581
PO BOX 582, CHICAGO HEIGHTS, IL 60412-0582
PO BOX 583, CHICAGO HEIGHTS, IL 60412-0583
PO BOX 584, CHICAGO HEIGHTS, IL 60412-0584
PO BOX 585, CHICAGO HEIGHTS, IL 60412-0585
PO BOX 586, CHICAGO HEIGHTS, IL 60412-0586
PO BOX 587, CHICAGO HEIGHTS, IL 60412-0587
PO BOX 588, CHICAGO HEIGHTS, IL 60412-0588
PO BOX 589, CHICAGO HEIGHTS, IL 60412-0589
PO BOX 590, CHICAGO HEIGHTS, IL 60412-0590
PO BOX 591, CHICAGO HEIGHTS, IL 60412-0591
PO BOX 592, CHICAGO HEIGHTS, IL 60412-0592
PO BOX 593, CHICAGO HEIGHTS, IL 60412-0593
PO BOX 594, CHICAGO HEIGHTS, IL 60412-0594
PO BOX 595, CHICAGO HEIGHTS, IL 60412-0595
PO BOX 596, CHICAGO HEIGHTS, IL 60412-0596
PO BOX 597, CHICAGO HEIGHTS, IL 60412-0597
PO BOX 598, CHICAGO HEIGHTS, IL 60412-0598
PO BOX 599, CHICAGO HEIGHTS, IL 60412-0599
PO BOX 600, CHICAGO HEIGHTS, IL 60412-0600
PO BOX 601, CHICAGO HEIGHTS, IL 60412-0601
PO BOX 602, CHICAGO HEIGHTS, IL 60412-0602
PO BOX 603, CHICAGO HEIGHTS, IL 60412-0603
PO BOX 604, CHICAGO HEIGHTS, IL 60412-0604
PO BOX 605, CHICAGO HEIGHTS, IL 60412-0605
PO BOX 606, CHICAGO HEIGHTS, IL 60412-0606
PO BOX 607, CHICAGO HEIGHTS, IL 60412-0607
PO BOX 608, CHICAGO HEIGHTS, IL 60412-0608
PO BOX 609, CHICAGO HEIGHTS, IL 60412-0609
PO BOX 610, CHICAGO HEIGHTS, IL 60412-0610
PO BOX 611, CHICAGO HEIGHTS, IL 60412-0611
PO BOX 612, CHICAGO HEIGHTS, IL 60412-0612
PO BOX 613, CHICAGO HEIGHTS, IL 60412-0613
PO BOX 614, CHICAGO HEIGHTS, IL 60412-0614
PO BOX 615, CHICAGO HEIGHTS, IL 60412-0615
PO BOX 616, CHICAGO HEIGHTS, IL 60412-0616
PO BOX 617, CHICAGO HEIGHTS, IL 60412-0617
PO BOX 618, CHICAGO HEIGHTS, IL 60412-0618
PO BOX 619, CHICAGO HEIGHTS, IL 60412-0619
PO BOX 620, CHICAGO HEIGHTS, IL 60412-0620
PO BOX 621, CHICAGO HEIGHTS, IL 60412-0621
PO BOX 622, CHICAGO HEIGHTS, IL 60412-0622
PO BOX 623, CHICAGO HEIGHTS, IL 60412-0623
PO BOX 624, CHICAGO HEIGHTS, IL 60412-0624
PO BOX 625, CHICAGO HEIGHTS, IL 60412-0625
PO BOX 626, CHICAGO HEIGHTS, IL 60412-0626
PO BOX 627, CHICAGO HEIGHTS, IL 60412-0627
PO BOX 628, CHICAGO HEIGHTS, IL 60412-0628
PO BOX 629, CHICAGO HEIGHTS, IL 60412-0629
PO BOX 630, CHICAGO HEIGHTS, IL 60412-0630
PO BOX 631, CHICAGO HEIGHTS, IL 60412-0631
PO BOX 632, CHICAGO HEIGHTS, IL 60412-0632
PO BOX 633, CHICAGO HEIGHTS, IL 60412-0633
PO BOX 634, CHICAGO HEIGHTS, IL 60412-0634
PO BOX 635, CHICAGO HEIGHTS, IL 60412-0635
PO BOX 636, CHICAGO HEIGHTS, IL 60412-0636
PO BOX 637, CHICAGO HEIGHTS, IL 60412-0637
PO BOX 638, CHICAGO HEIGHTS, IL 60412-0638
PO BOX 639, CHICAGO HEIGHTS, IL 60412-0639
PO BOX 640, CHICAGO HEIGHTS, IL 60412-0640
PO BOX 641, CHICAGO HEIGHTS, IL 60412-0641
PO BOX 642, CHICAGO HEIGHTS, IL 60412-0642
PO BOX 643, CHICAGO HEIGHTS, IL 60412-0643
PO BOX 644, CHICAGO HEIGHTS, IL 60412-0644
PO BOX 645, CHICAGO HEIGHTS, IL 60412-0645
PO BOX 646, CHICAGO HEIGHTS, IL 60412-0646
PO BOX 647, CHICAGO HEIGHTS, IL 60412-0647
PO BOX 648, CHICAGO HEIGHTS, IL 60412-0648
PO BOX 649, CHICAGO HEIGHTS, IL 60412-0649
PO BOX 650, CHICAGO HEIGHTS, IL 60412-0650
PO BOX 651, CHICAGO HEIGHTS, IL 60412-0651
PO BOX 652, CHICAGO HEIGHTS, IL 60412-0652
PO BOX 653, CHICAGO HEIGHTS, IL 60412-0653
PO BOX 654, CHICAGO HEIGHTS, IL 60412-0654
PO BOX 655, CHICAGO HEIGHTS, IL 60412-0655
PO BOX 656, CHICAGO HEIGHTS, IL 60412-0656
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