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, PORTERVILLE, CA 93258-0481
PO BOX 482, PORTERVILLE, CA 93258-0482
PO BOX 483, PORTERVILLE, CA 93258-0483
PO BOX 484, PORTERVILLE, CA 93258-0484
PO BOX 485, PORTERVILLE, CA 93258-0485
PO BOX 486, PORTERVILLE, CA 93258-0486
PO BOX 487, PORTERVILLE, CA 93258-0487
PO BOX 488, PORTERVILLE, CA 93258-0488
PO BOX 489, PORTERVILLE, CA 93258-0489
PO BOX 490, PORTERVILLE, CA 93258-0490
PO BOX 491, PORTERVILLE, CA 93258-0491
PO BOX 492, PORTERVILLE, CA 93258-0492
PO BOX 493, PORTERVILLE, CA 93258-0493
PO BOX 494, PORTERVILLE, CA 93258-0494
PO BOX 495, PORTERVILLE, CA 93258-0495
PO BOX 496, PORTERVILLE, CA 93258-0496
PO BOX 497, PORTERVILLE, CA 93258-0497
PO BOX 498, PORTERVILLE, CA 93258-0498
PO BOX 499, PORTERVILLE, CA 93258-0499
PO BOX 500, PORTERVILLE, CA 93258-0500
PO BOX 501, PORTERVILLE, CA 93258-0501
PO BOX 502, PORTERVILLE, CA 93258-0502
PO BOX 503, PORTERVILLE, CA 93258-0503
PO BOX 504, PORTERVILLE, CA 93258-0504
PO BOX 505, PORTERVILLE, CA 93258-0505
PO BOX 506, PORTERVILLE, CA 93258-0506
PO BOX 507, PORTERVILLE, CA 93258-0507
PO BOX 508, PORTERVILLE, CA 93258-0508
PO BOX 509, PORTERVILLE, CA 93258-0509
PO BOX 510, PORTERVILLE, CA 93258-0510
PO BOX 511, PORTERVILLE, CA 93258-0511
PO BOX 512, PORTERVILLE, CA 93258-0512
PO BOX 513, PORTERVILLE, CA 93258-0513
PO BOX 514, PORTERVILLE, CA 93258-0514
PO BOX 515, PORTERVILLE, CA 93258-0515
PO BOX 516, PORTERVILLE, CA 93258-0516
PO BOX 517, PORTERVILLE, CA 93258-0517
PO BOX 518, PORTERVILLE, CA 93258-0518
PO BOX 519, PORTERVILLE, CA 93258-0519
PO BOX 520, PORTERVILLE, CA 93258-0520
PO BOX 521, PORTERVILLE, CA 93258-0521
PO BOX 522, PORTERVILLE, CA 93258-0522
PO BOX 523, PORTERVILLE, CA 93258-0523
PO BOX 524, PORTERVILLE, CA 93258-0524
PO BOX 525, PORTERVILLE, CA 93258-0525
PO BOX 526, PORTERVILLE, CA 93258-0526
PO BOX 527, PORTERVILLE, CA 93258-0527
PO BOX 528, PORTERVILLE, CA 93258-0528
PO BOX 529, PORTERVILLE, CA 93258-0529
PO BOX 530, PORTERVILLE, CA 93258-0530
PO BOX 531, PORTERVILLE, CA 93258-0531
PO BOX 532, PORTERVILLE, CA 93258-0532
PO BOX 533, PORTERVILLE, CA 93258-0533
PO BOX 534, PORTERVILLE, CA 93258-0534
PO BOX 535, PORTERVILLE, CA 93258-0535
PO BOX 536, PORTERVILLE, CA 93258-0536
PO BOX 537, PORTERVILLE, CA 93258-0537
PO BOX 538, PORTERVILLE, CA 93258-0538
PO BOX 539, PORTERVILLE, CA 93258-0539
PO BOX 540, PORTERVILLE, CA 93258-0540
PO BOX 541, PORTERVILLE, CA 93258-0541
PO BOX 542, PORTERVILLE, CA 93258-0542
PO BOX 543, PORTERVILLE, CA 93258-0543
PO BOX 544, PORTERVILLE, CA 93258-0544
PO BOX 545, PORTERVILLE, CA 93258-0545
PO BOX 546, PORTERVILLE, CA 93258-0546
PO BOX 547, PORTERVILLE, CA 93258-0547
PO BOX 548, PORTERVILLE, CA 93258-0548
PO BOX 549, PORTERVILLE, CA 93258-0549
PO BOX 550, PORTERVILLE, CA 93258-0550
PO BOX 551, PORTERVILLE, CA 93258-0551
PO BOX 552, PORTERVILLE, CA 93258-0552
PO BOX 553, PORTERVILLE, CA 93258-0553
PO BOX 554, PORTERVILLE, CA 93258-0554
PO BOX 555, PORTERVILLE, CA 93258-0555
PO BOX 556, PORTERVILLE, CA 93258-0556
PO BOX 557, PORTERVILLE, CA 93258-0557
PO BOX 558, PORTERVILLE, CA 93258-0558
PO BOX 559, PORTERVILLE, CA 93258-0559
PO BOX 560, PORTERVILLE, CA 93258-0560
PO BOX 561, PORTERVILLE, CA 93258-0561
PO BOX 562, PORTERVILLE, CA 93258-0562
PO BOX 563, PORTERVILLE, CA 93258-0563
PO BOX 564, PORTERVILLE, CA 93258-0564
PO BOX 565, PORTERVILLE, CA 93258-0565
PO BOX 566, PORTERVILLE, CA 93258-0566
PO BOX 567, PORTERVILLE, CA 93258-0567
PO BOX 568, PORTERVILLE, CA 93258-0568
PO BOX 569, PORTERVILLE, CA 93258-0569
PO BOX 570, PORTERVILLE, CA 93258-0570
PO BOX 571, PORTERVILLE, CA 93258-0571
PO BOX 572, PORTERVILLE, CA 93258-0572
PO BOX 573, PORTERVILLE, CA 93258-0573
PO BOX 574, PORTERVILLE, CA 93258-0574
PO BOX 575, PORTERVILLE, CA 93258-0575
PO BOX 576, PORTERVILLE, CA 93258-0576
PO BOX 577, PORTERVILLE, CA 93258-0577
PO BOX 578, PORTERVILLE, CA 93258-0578
PO BOX 579, PORTERVILLE, CA 93258-0579
PO BOX 580, PORTERVILLE, CA 93258-0580
PO BOX 581, PORTERVILLE, CA 93258-0581
PO BOX 582, PORTERVILLE, CA 93258-0582
PO BOX 583, PORTERVILLE, CA 93258-0583
PO BOX 584, PORTERVILLE, CA 93258-0584
PO BOX 585, PORTERVILLE, CA 93258-0585
PO BOX 586, PORTERVILLE, CA 93258-0586
PO BOX 587, PORTERVILLE, CA 93258-0587
PO BOX 588, PORTERVILLE, CA 93258-0588
PO BOX 589, PORTERVILLE, CA 93258-0589
PO BOX 590, PORTERVILLE, CA 93258-0590
PO BOX 591, PORTERVILLE, CA 93258-0591
PO BOX 592, PORTERVILLE, CA 93258-0592
PO BOX 593, PORTERVILLE, CA 93258-0593
PO BOX 594, PORTERVILLE, CA 93258-0594
PO BOX 595, PORTERVILLE, CA 93258-0595
PO BOX 596, PORTERVILLE, CA 93258-0596
PO BOX 597, PORTERVILLE, CA 93258-0597
PO BOX 598, PORTERVILLE, CA 93258-0598
PO BOX 599, PORTERVILLE, CA 93258-0599
PO BOX 600, PORTERVILLE, CA 93258-0600
PO BOX 601, PORTERVILLE, CA 93258-0601
PO BOX 602, PORTERVILLE, CA 93258-0602
PO BOX 603, PORTERVILLE, CA 93258-0603
PO BOX 604, PORTERVILLE, CA 93258-0604
PO BOX 605, PORTERVILLE, CA 93258-0605
PO BOX 606, PORTERVILLE, CA 93258-0606
PO BOX 607, PORTERVILLE, CA 93258-0607
PO BOX 608, PORTERVILLE, CA 93258-0608
PO BOX 609, PORTERVILLE, CA 93258-0609
PO BOX 610, PORTERVILLE, CA 93258-0610
PO BOX 611, PORTERVILLE, CA 93258-0611
PO BOX 612, PORTERVILLE, CA 93258-0612
PO BOX 613, PORTERVILLE, CA 93258-0613
PO BOX 614, PORTERVILLE, CA 93258-0614
PO BOX 615, PORTERVILLE, CA 93258-0615
PO BOX 616, PORTERVILLE, CA 93258-0616
PO BOX 617, PORTERVILLE, CA 93258-0617
PO BOX 618, PORTERVILLE, CA 93258-0618
PO BOX 619, PORTERVILLE, CA 93258-0619
PO BOX 620, PORTERVILLE, CA 93258-0620
PO BOX 621, PORTERVILLE, CA 93258-0621
PO BOX 622, PORTERVILLE, CA 93258-0622
PO BOX 623, PORTERVILLE, CA 93258-0623
PO BOX 624, PORTERVILLE, CA 93258-0624
PO BOX 625, PORTERVILLE, CA 93258-0625
PO BOX 626, PORTERVILLE, CA 93258-0626
PO BOX 627, PORTERVILLE, CA 93258-0627
PO BOX 628, PORTERVILLE, CA 93258-0628
PO BOX 629, PORTERVILLE, CA 93258-0629
PO BOX 630, PORTERVILLE, CA 93258-0630
PO BOX 631, PORTERVILLE, CA 93258-0631
PO BOX 632, PORTERVILLE, CA 93258-0632
PO BOX 633, PORTERVILLE, CA 93258-0633
PO BOX 634, PORTERVILLE, CA 93258-0634
PO BOX 635, PORTERVILLE, CA 93258-0635
PO BOX 636, PORTERVILLE, CA 93258-0636
PO BOX 637, PORTERVILLE, CA 93258-0637
PO BOX 638, PORTERVILLE, CA 93258-0638
PO BOX 639, PORTERVILLE, CA 93258-0639
PO BOX 640, PORTERVILLE, CA 93258-0640
PO BOX 641, PORTERVILLE, CA 93258-0641
PO BOX 642, PORTERVILLE, CA 93258-0642
PO BOX 643, PORTERVILLE, CA 93258-0643
PO BOX 644, PORTERVILLE, CA 93258-0644
PO BOX 645, PORTERVILLE, CA 93258-0645
PO BOX 646, PORTERVILLE, CA 93258-0646
PO BOX 647, PORTERVILLE, CA 93258-0647
PO BOX 648, PORTERVILLE, CA 93258-0648
PO BOX 649, PORTERVILLE, CA 93258-0649
PO BOX 650, PORTERVILLE, CA 93258-0650
PO BOX 651, PORTERVILLE, CA 93258-0651
PO BOX 652, PORTERVILLE, CA 93258-0652
PO BOX 653, PORTERVILLE, CA 93258-0653
PO BOX 654, PORTERVILLE, CA 93258-0654
PO BOX 655, PORTERVILLE, CA 93258-0655
PO BOX 656, PORTERVILLE, CA 93258-0656
PO BOX 657, PORTERVILLE, CA 93258-0657
PO BOX 658, PORTERVILLE, CA 93258-0658
PO BOX 659, PORTERVILLE, CA 93258-0659
PO BOX 660, PORTERVILLE, CA 93258-0660
PO BOX 661, PORTERVILLE, CA 93258-0661
PO BOX 662, PORTERVILLE, CA 93258-0662
PO BOX 663, PORTERVILLE, CA 93258-0663
PO BOX 664, PORTERVILLE, CA 93258-0664
PO BOX 665, PORTERVILLE, CA 93258-0665
PO BOX 666, PORTERVILLE, CA 93258-0666
PO BOX 667, PORTERVILLE, CA 93258-0667
PO BOX 668, PORTERVILLE, CA 93258-0668
PO BOX 669, PORTERVILLE, CA 93258-0669
PO BOX 670, PORTERVILLE, CA 93258-0670
PO BOX 671, PORTERVILLE, CA 93258-0671
PO BOX 672, PORTERVILLE, CA 93258-0672
PO BOX 673, PORTERVILLE, CA 93258-0673
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