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 591, FERNANDINA BEACH, FL 32035-0591
PO BOX 592, FERNANDINA BEACH, FL 32035-0592
PO BOX 593, FERNANDINA BEACH, FL 32035-0593
PO BOX 594, FERNANDINA BEACH, FL 32035-0594
PO BOX 595, FERNANDINA BEACH, FL 32035-0595
PO BOX 596, FERNANDINA BEACH, FL 32035-0596
PO BOX 597, FERNANDINA BEACH, FL 32035-0597
PO BOX 598, FERNANDINA BEACH, FL 32035-0598
PO BOX 599, FERNANDINA BEACH, FL 32035-0599
PO BOX 600, FERNANDINA BEACH, FL 32035-0600
PO BOX 601, FERNANDINA BEACH, FL 32035-0601
PO BOX 602, FERNANDINA BEACH, FL 32035-0602
PO BOX 603, FERNANDINA BEACH, FL 32035-0603
PO BOX 604, FERNANDINA BEACH, FL 32035-0604
PO BOX 605, FERNANDINA BEACH, FL 32035-0605
PO BOX 606, FERNANDINA BEACH, FL 32035-0606
PO BOX 607, FERNANDINA BEACH, FL 32035-0607
PO BOX 608, FERNANDINA BEACH, FL 32035-0608
PO BOX 609, FERNANDINA BEACH, FL 32035-0609
PO BOX 610, FERNANDINA BEACH, FL 32035-0610
PO BOX 611, FERNANDINA BEACH, FL 32035-0611
PO BOX 612, FERNANDINA BEACH, FL 32035-0612
PO BOX 613, FERNANDINA BEACH, FL 32035-0613
PO BOX 614, FERNANDINA BEACH, FL 32035-0614
PO BOX 615, FERNANDINA BEACH, FL 32035-0615
PO BOX 616, FERNANDINA BEACH, FL 32035-0616
PO BOX 617, FERNANDINA BEACH, FL 32035-0617
PO BOX 618, FERNANDINA BEACH, FL 32035-0618
PO BOX 619, FERNANDINA BEACH, FL 32035-0619
PO BOX 620, FERNANDINA BEACH, FL 32035-0620
PO BOX 621, FERNANDINA BEACH, FL 32035-0621
PO BOX 622, FERNANDINA BEACH, FL 32035-0622
PO BOX 623, FERNANDINA BEACH, FL 32035-0623
PO BOX 624, FERNANDINA BEACH, FL 32035-0624
PO BOX 625, FERNANDINA BEACH, FL 32035-0625
PO BOX 626, FERNANDINA BEACH, FL 32035-0626
PO BOX 627, FERNANDINA BEACH, FL 32035-0627
PO BOX 628, FERNANDINA BEACH, FL 32035-0628
PO BOX 629, FERNANDINA BEACH, FL 32035-0629
PO BOX 630, FERNANDINA BEACH, FL 32035-0630
PO BOX 631, FERNANDINA BEACH, FL 32035-0631
PO BOX 632, FERNANDINA BEACH, FL 32035-0632
PO BOX 633, FERNANDINA BEACH, FL 32035-0633
PO BOX 634, FERNANDINA BEACH, FL 32035-0634
PO BOX 635, FERNANDINA BEACH, FL 32035-0635
PO BOX 636, FERNANDINA BEACH, FL 32035-0636
PO BOX 637, FERNANDINA BEACH, FL 32035-0637
PO BOX 638, FERNANDINA BEACH, FL 32035-0638
PO BOX 639, FERNANDINA BEACH, FL 32035-0639
PO BOX 640, FERNANDINA BEACH, FL 32035-0640
PO BOX 641, FERNANDINA BEACH, FL 32035-0641
PO BOX 642, FERNANDINA BEACH, FL 32035-0642
PO BOX 643, FERNANDINA BEACH, FL 32035-0643
PO BOX 644, FERNANDINA BEACH, FL 32035-0644
PO BOX 645, FERNANDINA BEACH, FL 32035-0645
PO BOX 646, FERNANDINA BEACH, FL 32035-0646
PO BOX 647, FERNANDINA BEACH, FL 32035-0647
PO BOX 648, FERNANDINA BEACH, FL 32035-0648
PO BOX 649, FERNANDINA BEACH, FL 32035-0649
PO BOX 650, FERNANDINA BEACH, FL 32035-0650
PO BOX 651, FERNANDINA BEACH, FL 32035-0651
PO BOX 652, FERNANDINA BEACH, FL 32035-0652
PO BOX 653, FERNANDINA BEACH, FL 32035-0653
PO BOX 654, FERNANDINA BEACH, FL 32035-0654
PO BOX 655, FERNANDINA BEACH, FL 32035-0655
PO BOX 656, FERNANDINA BEACH, FL 32035-0656
PO BOX 657, FERNANDINA BEACH, FL 32035-0657
PO BOX 658, FERNANDINA BEACH, FL 32035-0658
PO BOX 659, FERNANDINA BEACH, FL 32035-0659
PO BOX 660, FERNANDINA BEACH, FL 32035-0660
PO BOX 661, FERNANDINA BEACH, FL 32035-0661
PO BOX 662, FERNANDINA BEACH, FL 32035-0662
PO BOX 663, FERNANDINA BEACH, FL 32035-0663
PO BOX 664, FERNANDINA BEACH, FL 32035-0664
PO BOX 665, FERNANDINA BEACH, FL 32035-0665
PO BOX 666, FERNANDINA BEACH, FL 32035-0666
PO BOX 667, FERNANDINA BEACH, FL 32035-0667
PO BOX 668, FERNANDINA BEACH, FL 32035-0668
PO BOX 669, FERNANDINA BEACH, FL 32035-0669
PO BOX 670, FERNANDINA BEACH, FL 32035-0670
PO BOX 671, FERNANDINA BEACH, FL 32035-0671
PO BOX 672, FERNANDINA BEACH, FL 32035-0672
PO BOX 673, FERNANDINA BEACH, FL 32035-0673
PO BOX 674, FERNANDINA BEACH, FL 32035-0674
PO BOX 675, FERNANDINA BEACH, FL 32035-0675
PO BOX 676, FERNANDINA BEACH, FL 32035-0676
PO BOX 677, FERNANDINA BEACH, FL 32035-0677
PO BOX 678, FERNANDINA BEACH, FL 32035-0678
PO BOX 679, FERNANDINA BEACH, FL 32035-0679
PO BOX 680, FERNANDINA BEACH, FL 32035-0680
PO BOX 681, FERNANDINA BEACH, FL 32035-0681
PO BOX 682, FERNANDINA BEACH, FL 32035-0682
PO BOX 683, FERNANDINA BEACH, FL 32035-0683
PO BOX 684, FERNANDINA BEACH, FL 32035-0684
PO BOX 685, FERNANDINA BEACH, FL 32035-0685
PO BOX 686, FERNANDINA BEACH, FL 32035-0686
PO BOX 687, FERNANDINA BEACH, FL 32035-0687
PO BOX 688, FERNANDINA BEACH, FL 32035-0688
PO BOX 689, FERNANDINA BEACH, FL 32035-0689
PO BOX 690, FERNANDINA BEACH, FL 32035-0690
PO BOX 691, FERNANDINA BEACH, FL 32035-0691
PO BOX 692, FERNANDINA BEACH, FL 32035-0692
PO BOX 693, FERNANDINA BEACH, FL 32035-0693
PO BOX 694, FERNANDINA BEACH, FL 32035-0694
PO BOX 695, FERNANDINA BEACH, FL 32035-0695
PO BOX 696, FERNANDINA BEACH, FL 32035-0696
PO BOX 697, FERNANDINA BEACH, FL 32035-0697
PO BOX 698, FERNANDINA BEACH, FL 32035-0698
PO BOX 699, FERNANDINA BEACH, FL 32035-0699
PO BOX 700, FERNANDINA BEACH, FL 32035-0700
PO BOX 701, FERNANDINA BEACH, FL 32035-0701
PO BOX 702, FERNANDINA BEACH, FL 32035-0702
PO BOX 703, FERNANDINA BEACH, FL 32035-0703
PO BOX 704, FERNANDINA BEACH, FL 32035-0704
PO BOX 705, FERNANDINA BEACH, FL 32035-0705
PO BOX 706, FERNANDINA BEACH, FL 32035-0706
PO BOX 707, FERNANDINA BEACH, FL 32035-0707
PO BOX 708, FERNANDINA BEACH, FL 32035-0708
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