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 471, MARLBOROUGH, MA 01752-0471
PO BOX 472, MARLBOROUGH, MA 01752-0472
PO BOX 473, MARLBOROUGH, MA 01752-0473
PO BOX 474, MARLBOROUGH, MA 01752-0474
PO BOX 475, MARLBOROUGH, MA 01752-0475
PO BOX 476, MARLBOROUGH, MA 01752-0476
PO BOX 477, MARLBOROUGH, MA 01752-0477
PO BOX 478, MARLBOROUGH, MA 01752-0478
PO BOX 479, MARLBOROUGH, MA 01752-0479
PO BOX 480, MARLBOROUGH, MA 01752-0480
PO BOX 481, MARLBOROUGH, MA 01752-0481
PO BOX 482, MARLBOROUGH, MA 01752-0482
PO BOX 483, MARLBOROUGH, MA 01752-0483
PO BOX 484, MARLBOROUGH, MA 01752-0484
PO BOX 485, MARLBOROUGH, MA 01752-0485
PO BOX 486, MARLBOROUGH, MA 01752-0486
PO BOX 487, MARLBOROUGH, MA 01752-0487
PO BOX 488, MARLBOROUGH, MA 01752-0488
PO BOX 489, MARLBOROUGH, MA 01752-0489
PO BOX 490, MARLBOROUGH, MA 01752-0490
PO BOX 491, MARLBOROUGH, MA 01752-0491
PO BOX 492, MARLBOROUGH, MA 01752-0492
PO BOX 493, MARLBOROUGH, MA 01752-0493
PO BOX 494, MARLBOROUGH, MA 01752-0494
PO BOX 495, MARLBOROUGH, MA 01752-0495
PO BOX 496, MARLBOROUGH, MA 01752-0496
PO BOX 497, MARLBOROUGH, MA 01752-0497
PO BOX 498, MARLBOROUGH, MA 01752-0498
PO BOX 499, MARLBOROUGH, MA 01752-0499
PO BOX 500, MARLBOROUGH, MA 01752-0500
PO BOX 501, MARLBOROUGH, MA 01752-0501
PO BOX 502, MARLBOROUGH, MA 01752-0502
PO BOX 503, MARLBOROUGH, MA 01752-0503
PO BOX 504, MARLBOROUGH, MA 01752-0504
PO BOX 505, MARLBOROUGH, MA 01752-0505
PO BOX 506, MARLBOROUGH, MA 01752-0506
PO BOX 507, MARLBOROUGH, MA 01752-0507
PO BOX 508, MARLBOROUGH, MA 01752-0508
PO BOX 509, MARLBOROUGH, MA 01752-0509
PO BOX 510, MARLBOROUGH, MA 01752-0510
PO BOX 511, MARLBOROUGH, MA 01752-0511
PO BOX 512, MARLBOROUGH, MA 01752-0512
PO BOX 513, MARLBOROUGH, MA 01752-0513
PO BOX 514, MARLBOROUGH, MA 01752-0514
PO BOX 515, MARLBOROUGH, MA 01752-0515
PO BOX 516, MARLBOROUGH, MA 01752-0516
PO BOX 517, MARLBOROUGH, MA 01752-0517
PO BOX 518, MARLBOROUGH, MA 01752-0518
PO BOX 519, MARLBOROUGH, MA 01752-0519
PO BOX 520, MARLBOROUGH, MA 01752-0520
PO BOX 521, MARLBOROUGH, MA 01752-0521
PO BOX 522, MARLBOROUGH, MA 01752-0522
PO BOX 523, MARLBOROUGH, MA 01752-0523
PO BOX 524, MARLBOROUGH, MA 01752-0524
PO BOX 525, MARLBOROUGH, MA 01752-0525
PO BOX 526, MARLBOROUGH, MA 01752-0526
PO BOX 527, MARLBOROUGH, MA 01752-0527
PO BOX 528, MARLBOROUGH, MA 01752-0528
PO BOX 529, MARLBOROUGH, MA 01752-0529
PO BOX 530, MARLBOROUGH, MA 01752-0530
PO BOX 531, MARLBOROUGH, MA 01752-0531
PO BOX 532, MARLBOROUGH, MA 01752-0532
PO BOX 533, MARLBOROUGH, MA 01752-0533
PO BOX 534, MARLBOROUGH, MA 01752-0534
PO BOX 535, MARLBOROUGH, MA 01752-0535
PO BOX 536, MARLBOROUGH, MA 01752-0536
PO BOX 537, MARLBOROUGH, MA 01752-0537
PO BOX 538, MARLBOROUGH, MA 01752-0538
PO BOX 539, MARLBOROUGH, MA 01752-0539
PO BOX 540, MARLBOROUGH, MA 01752-0540
PO BOX 541, MARLBOROUGH, MA 01752-0541
PO BOX 542, MARLBOROUGH, MA 01752-0542
PO BOX 543, MARLBOROUGH, MA 01752-0543
PO BOX 544, MARLBOROUGH, MA 01752-0544
PO BOX 545, MARLBOROUGH, MA 01752-0545
PO BOX 546, MARLBOROUGH, MA 01752-0546
PO BOX 547, MARLBOROUGH, MA 01752-0547
PO BOX 548, MARLBOROUGH, MA 01752-0548
PO BOX 549, MARLBOROUGH, MA 01752-0549
PO BOX 550, MARLBOROUGH, MA 01752-0550
PO BOX 551, MARLBOROUGH, MA 01752-0551
PO BOX 552, MARLBOROUGH, MA 01752-0552
PO BOX 553, MARLBOROUGH, MA 01752-0553
PO BOX 554, MARLBOROUGH, MA 01752-0554
PO BOX 555, MARLBOROUGH, MA 01752-0555
PO BOX 556, MARLBOROUGH, MA 01752-0556
PO BOX 557, MARLBOROUGH, MA 01752-0557
PO BOX 558, MARLBOROUGH, MA 01752-0558
PO BOX 559, MARLBOROUGH, MA 01752-0559
PO BOX 560, MARLBOROUGH, MA 01752-0560
PO BOX 561, MARLBOROUGH, MA 01752-0561
PO BOX 562, MARLBOROUGH, MA 01752-0562
PO BOX 563, MARLBOROUGH, MA 01752-0563
PO BOX 564, MARLBOROUGH, MA 01752-0564
PO BOX 565, MARLBOROUGH, MA 01752-0565
PO BOX 566, MARLBOROUGH, MA 01752-0566
PO BOX 567, MARLBOROUGH, MA 01752-0567
PO BOX 568, MARLBOROUGH, MA 01752-0568
PO BOX 569, MARLBOROUGH, MA 01752-0569
PO BOX 570, MARLBOROUGH, MA 01752-0570
PO BOX 571, MARLBOROUGH, MA 01752-0571
PO BOX 572, MARLBOROUGH, MA 01752-0572
PO BOX 573, MARLBOROUGH, MA 01752-0573
PO BOX 574, MARLBOROUGH, MA 01752-0574
PO BOX 575, MARLBOROUGH, MA 01752-0575
PO BOX 576, MARLBOROUGH, MA 01752-0576
PO BOX 577, MARLBOROUGH, MA 01752-0577
PO BOX 578, MARLBOROUGH, MA 01752-0578
PO BOX 579, MARLBOROUGH, MA 01752-0579
PO BOX 580, MARLBOROUGH, MA 01752-0580
PO BOX 581, MARLBOROUGH, MA 01752-0581
PO BOX 582, MARLBOROUGH, MA 01752-0582
PO BOX 583, MARLBOROUGH, MA 01752-0583
PO BOX 584, MARLBOROUGH, MA 01752-0584
PO BOX 585, MARLBOROUGH, MA 01752-0585
PO BOX 586, MARLBOROUGH, MA 01752-0586
PO BOX 587, MARLBOROUGH, MA 01752-0587
PO BOX 588, MARLBOROUGH, MA 01752-0588
PO BOX 589, MARLBOROUGH, MA 01752-0589
PO BOX 590, MARLBOROUGH, MA 01752-0590
PO BOX 591, MARLBOROUGH, MA 01752-0591
PO BOX 592, MARLBOROUGH, MA 01752-0592
PO BOX 593, MARLBOROUGH, MA 01752-0593
PO BOX 594, MARLBOROUGH, MA 01752-0594
PO BOX 595, MARLBOROUGH, MA 01752-0595
PO BOX 596, MARLBOROUGH, MA 01752-0596
PO BOX 597, MARLBOROUGH, MA 01752-0597
PO BOX 598, MARLBOROUGH, MA 01752-0598
PO BOX 599, MARLBOROUGH, MA 01752-0599
PO BOX 600, MARLBOROUGH, MA 01752-0600
PO BOX 601, MARLBOROUGH, MA 01752-0601
PO BOX 602, MARLBOROUGH, MA 01752-0602
PO BOX 603, MARLBOROUGH, MA 01752-0603
PO BOX 604, MARLBOROUGH, MA 01752-0604
PO BOX 605, MARLBOROUGH, MA 01752-0605
PO BOX 606, MARLBOROUGH, MA 01752-0606
PO BOX 607, MARLBOROUGH, MA 01752-0607
PO BOX 608, MARLBOROUGH, MA 01752-0608
PO BOX 609, MARLBOROUGH, MA 01752-0609
PO BOX 610, MARLBOROUGH, MA 01752-0610
PO BOX 611, MARLBOROUGH, MA 01752-0611
PO BOX 612, MARLBOROUGH, MA 01752-0612
PO BOX 613, MARLBOROUGH, MA 01752-0613
PO BOX 614, MARLBOROUGH, MA 01752-0614
PO BOX 615, MARLBOROUGH, MA 01752-0615
PO BOX 616, MARLBOROUGH, MA 01752-0616
PO BOX 617, MARLBOROUGH, MA 01752-0617
PO BOX 618, MARLBOROUGH, MA 01752-0618
PO BOX 619, MARLBOROUGH, MA 01752-0619
PO BOX 620, MARLBOROUGH, MA 01752-0620
PO BOX 621, MARLBOROUGH, MA 01752-0621
PO BOX 622, MARLBOROUGH, MA 01752-0622
PO BOX 623, MARLBOROUGH, MA 01752-0623
PO BOX 624, MARLBOROUGH, MA 01752-0624
PO BOX 625, MARLBOROUGH, MA 01752-0625
PO BOX 626, MARLBOROUGH, MA 01752-0626
PO BOX 627, MARLBOROUGH, MA 01752-0627
PO BOX 628, MARLBOROUGH, MA 01752-0628
PO BOX 629, MARLBOROUGH, MA 01752-0629
PO BOX 630, MARLBOROUGH, MA 01752-0630
PO BOX 631, MARLBOROUGH, MA 01752-0631
PO BOX 632, MARLBOROUGH, MA 01752-0632
PO BOX 633, MARLBOROUGH, MA 01752-0633
PO BOX 634, MARLBOROUGH, MA 01752-0634
PO BOX 635, MARLBOROUGH, MA 01752-0635
PO BOX 636, MARLBOROUGH, MA 01752-0636
PO BOX 637, MARLBOROUGH, MA 01752-0637
PO BOX 638, MARLBOROUGH, MA 01752-0638
PO BOX 639, MARLBOROUGH, MA 01752-0639
PO BOX 640, MARLBOROUGH, MA 01752-0640
PO BOX 641, MARLBOROUGH, MA 01752-0641
PO BOX 642, MARLBOROUGH, MA 01752-0642
PO BOX 643, MARLBOROUGH, MA 01752-0643
PO BOX 644, MARLBOROUGH, MA 01752-0644
PO BOX 645, MARLBOROUGH, MA 01752-0645
PO BOX 646, MARLBOROUGH, MA 01752-0646
PO BOX 647, MARLBOROUGH, MA 01752-0647
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