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, UPPER MARLBORO, MD 20773-0541
PO BOX 542, UPPER MARLBORO, MD 20773-0542
PO BOX 543, UPPER MARLBORO, MD 20773-0543
PO BOX 544, UPPER MARLBORO, MD 20773-0544
PO BOX 545, UPPER MARLBORO, MD 20773-0545
PO BOX 546, UPPER MARLBORO, MD 20773-0546
PO BOX 547, UPPER MARLBORO, MD 20773-0547
PO BOX 548, UPPER MARLBORO, MD 20773-0548
PO BOX 549, UPPER MARLBORO, MD 20773-0549
PO BOX 550, UPPER MARLBORO, MD 20773-0550
PO BOX 551, UPPER MARLBORO, MD 20773-0551
PO BOX 552, UPPER MARLBORO, MD 20773-0552
PO BOX 553, UPPER MARLBORO, MD 20773-0553
PO BOX 554, UPPER MARLBORO, MD 20773-0554
PO BOX 555, UPPER MARLBORO, MD 20773-0555
PO BOX 556, UPPER MARLBORO, MD 20773-0556
PO BOX 557, UPPER MARLBORO, MD 20773-0557
PO BOX 558, UPPER MARLBORO, MD 20773-0558
PO BOX 559, UPPER MARLBORO, MD 20773-0559
PO BOX 560, UPPER MARLBORO, MD 20773-0560
PO BOX 561, UPPER MARLBORO, MD 20773-0561
PO BOX 562, UPPER MARLBORO, MD 20773-0562
PO BOX 563, UPPER MARLBORO, MD 20773-0563
PO BOX 564, UPPER MARLBORO, MD 20773-0564
PO BOX 565, UPPER MARLBORO, MD 20773-0565
PO BOX 566, UPPER MARLBORO, MD 20773-0566
PO BOX 567, UPPER MARLBORO, MD 20773-0567
PO BOX 568, UPPER MARLBORO, MD 20773-0568
PO BOX 569, UPPER MARLBORO, MD 20773-0569
PO BOX 570, UPPER MARLBORO, MD 20773-0570
PO BOX 571, UPPER MARLBORO, MD 20773-0571
PO BOX 572, UPPER MARLBORO, MD 20773-0572
PO BOX 573, UPPER MARLBORO, MD 20773-0573
PO BOX 574, UPPER MARLBORO, MD 20773-0574
PO BOX 575, UPPER MARLBORO, MD 20773-0575
PO BOX 576, UPPER MARLBORO, MD 20773-0576
PO BOX 577, UPPER MARLBORO, MD 20773-0577
PO BOX 578, UPPER MARLBORO, MD 20773-0578
PO BOX 579, UPPER MARLBORO, MD 20773-0579
PO BOX 580, UPPER MARLBORO, MD 20773-0580
PO BOX 581, UPPER MARLBORO, MD 20773-0581
PO BOX 582, UPPER MARLBORO, MD 20773-0582
PO BOX 583, UPPER MARLBORO, MD 20773-0583
PO BOX 584, UPPER MARLBORO, MD 20773-0584
PO BOX 585, UPPER MARLBORO, MD 20773-0585
PO BOX 586, UPPER MARLBORO, MD 20773-0586
PO BOX 587, UPPER MARLBORO, MD 20773-0587
PO BOX 588, UPPER MARLBORO, MD 20773-0588
PO BOX 589, UPPER MARLBORO, MD 20773-0589
PO BOX 590, UPPER MARLBORO, MD 20773-0590
PO BOX 591, UPPER MARLBORO, MD 20773-0591
PO BOX 592, UPPER MARLBORO, MD 20773-0592
PO BOX 593, UPPER MARLBORO, MD 20773-0593
PO BOX 594, UPPER MARLBORO, MD 20773-0594
PO BOX 595, UPPER MARLBORO, MD 20773-0595
PO BOX 596, UPPER MARLBORO, MD 20773-0596
PO BOX 597, UPPER MARLBORO, MD 20773-0597
PO BOX 598, UPPER MARLBORO, MD 20773-0598
PO BOX 599, UPPER MARLBORO, MD 20773-0599
PO BOX 600, UPPER MARLBORO, MD 20773-0600
PO BOX 601, UPPER MARLBORO, MD 20773-0601
PO BOX 602, UPPER MARLBORO, MD 20773-0602
PO BOX 603, UPPER MARLBORO, MD 20773-0603
PO BOX 604, UPPER MARLBORO, MD 20773-0604
PO BOX 605, UPPER MARLBORO, MD 20773-0605
PO BOX 606, UPPER MARLBORO, MD 20773-0606
PO BOX 607, UPPER MARLBORO, MD 20773-0607
PO BOX 608, UPPER MARLBORO, MD 20773-0608
PO BOX 609, UPPER MARLBORO, MD 20773-0609
PO BOX 610, UPPER MARLBORO, MD 20773-0610
PO BOX 611, UPPER MARLBORO, MD 20773-0611
PO BOX 612, UPPER MARLBORO, MD 20773-0612
PO BOX 613, UPPER MARLBORO, MD 20773-0613
PO BOX 614, UPPER MARLBORO, MD 20773-0614
PO BOX 615, UPPER MARLBORO, MD 20773-0615
PO BOX 616, UPPER MARLBORO, MD 20773-0616
PO BOX 617, UPPER MARLBORO, MD 20773-0617
PO BOX 618, UPPER MARLBORO, MD 20773-0618
PO BOX 619, UPPER MARLBORO, MD 20773-0619
PO BOX 620, UPPER MARLBORO, MD 20773-0620
PO BOX 621, UPPER MARLBORO, MD 20773-0621
PO BOX 622, UPPER MARLBORO, MD 20773-0622
PO BOX 623, UPPER MARLBORO, MD 20773-0623
PO BOX 624, UPPER MARLBORO, MD 20773-0624
PO BOX 625, UPPER MARLBORO, MD 20773-0625
PO BOX 626, UPPER MARLBORO, MD 20773-0626
PO BOX 627, UPPER MARLBORO, MD 20773-0627
PO BOX 628, UPPER MARLBORO, MD 20773-0628
PO BOX 629, UPPER MARLBORO, MD 20773-0629
PO BOX 630, UPPER MARLBORO, MD 20773-0630
PO BOX 631, UPPER MARLBORO, MD 20773-0631
PO BOX 632, UPPER MARLBORO, MD 20773-0632
PO BOX 633, UPPER MARLBORO, MD 20773-0633
PO BOX 634, UPPER MARLBORO, MD 20773-0634
PO BOX 635, UPPER MARLBORO, MD 20773-0635
PO BOX 636, UPPER MARLBORO, MD 20773-0636
PO BOX 637, UPPER MARLBORO, MD 20773-0637
PO BOX 638, UPPER MARLBORO, MD 20773-0638
PO BOX 639, UPPER MARLBORO, MD 20773-0639
PO BOX 640, UPPER MARLBORO, MD 20773-0640
PO BOX 641, UPPER MARLBORO, MD 20773-0641
PO BOX 642, UPPER MARLBORO, MD 20773-0642
PO BOX 643, UPPER MARLBORO, MD 20773-0643
PO BOX 644, UPPER MARLBORO, MD 20773-0644
PO BOX 645, UPPER MARLBORO, MD 20773-0645
PO BOX 646, UPPER MARLBORO, MD 20773-0646
PO BOX 647, UPPER MARLBORO, MD 20773-0647
PO BOX 648, UPPER MARLBORO, MD 20773-0648
PO BOX 649, UPPER MARLBORO, MD 20773-0649
PO BOX 650, UPPER MARLBORO, MD 20773-0650
PO BOX 651, UPPER MARLBORO, MD 20773-0651
PO BOX 652, UPPER MARLBORO, MD 20773-0652
PO BOX 653, UPPER MARLBORO, MD 20773-0653
PO BOX 654, UPPER MARLBORO, MD 20773-0654
PO BOX 655, UPPER MARLBORO, MD 20773-0655
PO BOX 656, UPPER MARLBORO, MD 20773-0656
PO BOX 657, UPPER MARLBORO, MD 20773-0657
PO BOX 658, UPPER MARLBORO, MD 20773-0658
PO BOX 659, UPPER MARLBORO, MD 20773-0659
PO BOX 660, UPPER MARLBORO, MD 20773-0660
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