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, WINTER HAVEN, FL 33882-0481
PO BOX 482, WINTER HAVEN, FL 33882-0482
PO BOX 483, WINTER HAVEN, FL 33882-0483
PO BOX 484, WINTER HAVEN, FL 33882-0484
PO BOX 485, WINTER HAVEN, FL 33882-0485
PO BOX 486, WINTER HAVEN, FL 33882-0486
PO BOX 487, WINTER HAVEN, FL 33882-0487
PO BOX 488, WINTER HAVEN, FL 33882-0488
PO BOX 489, WINTER HAVEN, FL 33882-0489
PO BOX 490, WINTER HAVEN, FL 33882-0490
PO BOX 491, WINTER HAVEN, FL 33882-0491
PO BOX 492, WINTER HAVEN, FL 33882-0492
PO BOX 493, WINTER HAVEN, FL 33882-0493
PO BOX 494, WINTER HAVEN, FL 33882-0494
PO BOX 495, WINTER HAVEN, FL 33882-0495
PO BOX 496, WINTER HAVEN, FL 33882-0496
PO BOX 497, WINTER HAVEN, FL 33882-0497
PO BOX 498, WINTER HAVEN, FL 33882-0498
PO BOX 499, WINTER HAVEN, FL 33882-0499
PO BOX 500, WINTER HAVEN, FL 33882-0500
PO BOX 501, WINTER HAVEN, FL 33882-0501
PO BOX 502, WINTER HAVEN, FL 33882-0502
PO BOX 503, WINTER HAVEN, FL 33882-0503
PO BOX 504, WINTER HAVEN, FL 33882-0504
PO BOX 505, WINTER HAVEN, FL 33882-0505
PO BOX 506, WINTER HAVEN, FL 33882-0506
PO BOX 507, WINTER HAVEN, FL 33882-0507
PO BOX 508, WINTER HAVEN, FL 33882-0508
PO BOX 509, WINTER HAVEN, FL 33882-0509
PO BOX 510, WINTER HAVEN, FL 33882-0510
PO BOX 511, WINTER HAVEN, FL 33882-0511
PO BOX 512, WINTER HAVEN, FL 33882-0512
PO BOX 513, WINTER HAVEN, FL 33882-0513
PO BOX 514, WINTER HAVEN, FL 33882-0514
PO BOX 515, WINTER HAVEN, FL 33882-0515
PO BOX 516, WINTER HAVEN, FL 33882-0516
PO BOX 517, WINTER HAVEN, FL 33882-0517
PO BOX 518, WINTER HAVEN, FL 33882-0518
PO BOX 519, WINTER HAVEN, FL 33882-0519
PO BOX 520, WINTER HAVEN, FL 33882-0520
PO BOX 521, WINTER HAVEN, FL 33882-0521
PO BOX 522, WINTER HAVEN, FL 33882-0522
PO BOX 523, WINTER HAVEN, FL 33882-0523
PO BOX 524, WINTER HAVEN, FL 33882-0524
PO BOX 525, WINTER HAVEN, FL 33882-0525
PO BOX 526, WINTER HAVEN, FL 33882-0526
PO BOX 527, WINTER HAVEN, FL 33882-0527
PO BOX 528, WINTER HAVEN, FL 33882-0528
PO BOX 529, WINTER HAVEN, FL 33882-0529
PO BOX 530, WINTER HAVEN, FL 33882-0530
PO BOX 531, WINTER HAVEN, FL 33882-0531
PO BOX 532, WINTER HAVEN, FL 33882-0532
PO BOX 533, WINTER HAVEN, FL 33882-0533
PO BOX 534, WINTER HAVEN, FL 33882-0534
PO BOX 535, WINTER HAVEN, FL 33882-0535
PO BOX 536, WINTER HAVEN, FL 33882-0536
PO BOX 537, WINTER HAVEN, FL 33882-0537
PO BOX 538, WINTER HAVEN, FL 33882-0538
PO BOX 539, WINTER HAVEN, FL 33882-0539
PO BOX 540, WINTER HAVEN, FL 33882-0540
PO BOX 541, WINTER HAVEN, FL 33882-0541
PO BOX 542, WINTER HAVEN, FL 33882-0542
PO BOX 543, WINTER HAVEN, FL 33882-0543
PO BOX 544, WINTER HAVEN, FL 33882-0544
PO BOX 545, WINTER HAVEN, FL 33882-0545
PO BOX 546, WINTER HAVEN, FL 33882-0546
PO BOX 547, WINTER HAVEN, FL 33882-0547
PO BOX 548, WINTER HAVEN, FL 33882-0548
PO BOX 549, WINTER HAVEN, FL 33882-0549
PO BOX 550, WINTER HAVEN, FL 33882-0550
PO BOX 551, WINTER HAVEN, FL 33882-0551
PO BOX 552, WINTER HAVEN, FL 33882-0552
PO BOX 553, WINTER HAVEN, FL 33882-0553
PO BOX 554, WINTER HAVEN, FL 33882-0554
PO BOX 555, WINTER HAVEN, FL 33882-0555
PO BOX 556, WINTER HAVEN, FL 33882-0556
PO BOX 557, WINTER HAVEN, FL 33882-0557
PO BOX 558, WINTER HAVEN, FL 33882-0558
PO BOX 559, WINTER HAVEN, FL 33882-0559
PO BOX 560, WINTER HAVEN, FL 33882-0560
PO BOX 561, WINTER HAVEN, FL 33882-0561
PO BOX 562, WINTER HAVEN, FL 33882-0562
PO BOX 563, WINTER HAVEN, FL 33882-0563
PO BOX 564, WINTER HAVEN, FL 33882-0564
PO BOX 565, WINTER HAVEN, FL 33882-0565
PO BOX 566, WINTER HAVEN, FL 33882-0566
PO BOX 567, WINTER HAVEN, FL 33882-0567
PO BOX 568, WINTER HAVEN, FL 33882-0568
PO BOX 569, WINTER HAVEN, FL 33882-0569
PO BOX 570, WINTER HAVEN, FL 33882-0570
PO BOX 571, WINTER HAVEN, FL 33882-0571
PO BOX 572, WINTER HAVEN, FL 33882-0572
PO BOX 573, WINTER HAVEN, FL 33882-0573
PO BOX 574, WINTER HAVEN, FL 33882-0574
PO BOX 575, WINTER HAVEN, FL 33882-0575
PO BOX 576, WINTER HAVEN, FL 33882-0576
PO BOX 577, WINTER HAVEN, FL 33882-0577
PO BOX 578, WINTER HAVEN, FL 33882-0578
PO BOX 579, WINTER HAVEN, FL 33882-0579
PO BOX 580, WINTER HAVEN, FL 33882-0580
PO BOX 581, WINTER HAVEN, FL 33882-0581
PO BOX 582, WINTER HAVEN, FL 33882-0582
PO BOX 583, WINTER HAVEN, FL 33882-0583
PO BOX 584, WINTER HAVEN, FL 33882-0584
PO BOX 585, WINTER HAVEN, FL 33882-0585
PO BOX 586, WINTER HAVEN, FL 33882-0586
PO BOX 587, WINTER HAVEN, FL 33882-0587
PO BOX 588, WINTER HAVEN, FL 33882-0588
PO BOX 589, WINTER HAVEN, FL 33882-0589
PO BOX 590, WINTER HAVEN, FL 33882-0590
PO BOX 591, WINTER HAVEN, FL 33882-0591
PO BOX 592, WINTER HAVEN, FL 33882-0592
PO BOX 593, WINTER HAVEN, FL 33882-0593
PO BOX 594, WINTER HAVEN, FL 33882-0594
PO BOX 595, WINTER HAVEN, FL 33882-0595
PO BOX 596, WINTER HAVEN, FL 33882-0596
PO BOX 597, WINTER HAVEN, FL 33882-0597
PO BOX 598, WINTER HAVEN, FL 33882-0598
PO BOX 599, WINTER HAVEN, FL 33882-0599
PO BOX 600, WINTER HAVEN, FL 33882-0600
PO BOX 601, WINTER HAVEN, FL 33882-0601
PO BOX 602, WINTER HAVEN, FL 33882-0602
PO BOX 603, WINTER HAVEN, FL 33882-0603
PO BOX 604, WINTER HAVEN, FL 33882-0604
PO BOX 605, WINTER HAVEN, FL 33882-0605
PO BOX 606, WINTER HAVEN, FL 33882-0606
PO BOX 607, WINTER HAVEN, FL 33882-0607
PO BOX 608, WINTER HAVEN, FL 33882-0608
PO BOX 609, WINTER HAVEN, FL 33882-0609
PO BOX 610, WINTER HAVEN, FL 33882-0610
PO BOX 611, WINTER HAVEN, FL 33882-0611
PO BOX 612, WINTER HAVEN, FL 33882-0612
PO BOX 613, WINTER HAVEN, FL 33882-0613
PO BOX 614, WINTER HAVEN, FL 33882-0614
PO BOX 615, WINTER HAVEN, FL 33882-0615
PO BOX 616, WINTER HAVEN, FL 33882-0616
PO BOX 617, WINTER HAVEN, FL 33882-0617
PO BOX 618, WINTER HAVEN, FL 33882-0618
PO BOX 619, WINTER HAVEN, FL 33882-0619
PO BOX 620, WINTER HAVEN, FL 33882-0620
PO BOX 621, WINTER HAVEN, FL 33882-0621
PO BOX 622, WINTER HAVEN, FL 33882-0622
PO BOX 623, WINTER HAVEN, FL 33882-0623
PO BOX 624, WINTER HAVEN, FL 33882-0624
PO BOX 625, WINTER HAVEN, FL 33882-0625
PO BOX 626, WINTER HAVEN, FL 33882-0626
PO BOX 627, WINTER HAVEN, FL 33882-0627
PO BOX 628, WINTER HAVEN, FL 33882-0628
PO BOX 629, WINTER HAVEN, FL 33882-0629
PO BOX 630, WINTER HAVEN, FL 33882-0630
PO BOX 631, WINTER HAVEN, FL 33882-0631
PO BOX 632, WINTER HAVEN, FL 33882-0632
PO BOX 633, WINTER HAVEN, FL 33882-0633
PO BOX 634, WINTER HAVEN, FL 33882-0634
PO BOX 635, WINTER HAVEN, FL 33882-0635
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