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, SAN FERNANDO, CA 91341-0481
PO BOX 482, SAN FERNANDO, CA 91341-0482
PO BOX 483, SAN FERNANDO, CA 91341-0483
PO BOX 484, SAN FERNANDO, CA 91341-0484
PO BOX 485, SAN FERNANDO, CA 91341-0485
PO BOX 486, SAN FERNANDO, CA 91341-0486
PO BOX 487, SAN FERNANDO, CA 91341-0487
PO BOX 488, SAN FERNANDO, CA 91341-0488
PO BOX 489, SAN FERNANDO, CA 91341-0489
PO BOX 490, SAN FERNANDO, CA 91341-0490
PO BOX 491, SAN FERNANDO, CA 91341-0491
PO BOX 492, SAN FERNANDO, CA 91341-0492
PO BOX 493, SAN FERNANDO, CA 91341-0493
PO BOX 494, SAN FERNANDO, CA 91341-0494
PO BOX 495, SAN FERNANDO, CA 91341-0495
PO BOX 496, SAN FERNANDO, CA 91341-0496
PO BOX 497, SAN FERNANDO, CA 91341-0497
PO BOX 498, SAN FERNANDO, CA 91341-0498
PO BOX 499, SAN FERNANDO, CA 91341-0499
PO BOX 500, SAN FERNANDO, CA 91341-0500
PO BOX 501, SAN FERNANDO, CA 91341-0501
PO BOX 502, SAN FERNANDO, CA 91341-0502
PO BOX 503, SAN FERNANDO, CA 91341-0503
PO BOX 504, SAN FERNANDO, CA 91341-0504
PO BOX 505, SAN FERNANDO, CA 91341-0505
PO BOX 506, SAN FERNANDO, CA 91341-0506
PO BOX 507, SAN FERNANDO, CA 91341-0507
PO BOX 508, SAN FERNANDO, CA 91341-0508
PO BOX 509, SAN FERNANDO, CA 91341-0509
PO BOX 510, SAN FERNANDO, CA 91341-0510
PO BOX 511, SAN FERNANDO, CA 91341-0511
PO BOX 512, SAN FERNANDO, CA 91341-0512
PO BOX 513, SAN FERNANDO, CA 91341-0513
PO BOX 514, SAN FERNANDO, CA 91341-0514
PO BOX 515, SAN FERNANDO, CA 91341-0515
PO BOX 516, SAN FERNANDO, CA 91341-0516
PO BOX 517, SAN FERNANDO, CA 91341-0517
PO BOX 518, SAN FERNANDO, CA 91341-0518
PO BOX 519, SAN FERNANDO, CA 91341-0519
PO BOX 520, SAN FERNANDO, CA 91341-0520
PO BOX 521, SAN FERNANDO, CA 91341-0521
PO BOX 522, SAN FERNANDO, CA 91341-0522
PO BOX 523, SAN FERNANDO, CA 91341-0523
PO BOX 524, SAN FERNANDO, CA 91341-0524
PO BOX 525, SAN FERNANDO, CA 91341-0525
PO BOX 526, SAN FERNANDO, CA 91341-0526
PO BOX 527, SAN FERNANDO, CA 91341-0527
PO BOX 528, SAN FERNANDO, CA 91341-0528
PO BOX 529, SAN FERNANDO, CA 91341-0529
PO BOX 530, SAN FERNANDO, CA 91341-0530
PO BOX 531, SAN FERNANDO, CA 91341-0531
PO BOX 532, SAN FERNANDO, CA 91341-0532
PO BOX 533, SAN FERNANDO, CA 91341-0533
PO BOX 534, SAN FERNANDO, CA 91341-0534
PO BOX 535, SAN FERNANDO, CA 91341-0535
PO BOX 536, SAN FERNANDO, CA 91341-0536
PO BOX 537, SAN FERNANDO, CA 91341-0537
PO BOX 538, SAN FERNANDO, CA 91341-0538
PO BOX 539, SAN FERNANDO, CA 91341-0539
PO BOX 540, SAN FERNANDO, CA 91341-0540
PO BOX 541, SAN FERNANDO, CA 91341-0541
PO BOX 542, SAN FERNANDO, CA 91341-0542
PO BOX 543, SAN FERNANDO, CA 91341-0543
PO BOX 544, SAN FERNANDO, CA 91341-0544
PO BOX 545, SAN FERNANDO, CA 91341-0545
PO BOX 546, SAN FERNANDO, CA 91341-0546
PO BOX 547, SAN FERNANDO, CA 91341-0547
PO BOX 548, SAN FERNANDO, CA 91341-0548
PO BOX 549, SAN FERNANDO, CA 91341-0549
PO BOX 550, SAN FERNANDO, CA 91341-0550
PO BOX 551, SAN FERNANDO, CA 91341-0551
PO BOX 552, SAN FERNANDO, CA 91341-0552
PO BOX 553, SAN FERNANDO, CA 91341-0553
PO BOX 554, SAN FERNANDO, CA 91341-0554
PO BOX 555, SAN FERNANDO, CA 91341-0555
PO BOX 556, SAN FERNANDO, CA 91341-0556
PO BOX 557, SAN FERNANDO, CA 91341-0557
PO BOX 558, SAN FERNANDO, CA 91341-0558
PO BOX 559, SAN FERNANDO, CA 91341-0559
PO BOX 560, SAN FERNANDO, CA 91341-0560
PO BOX 561, SAN FERNANDO, CA 91341-0561
PO BOX 562, SAN FERNANDO, CA 91341-0562
PO BOX 563, SAN FERNANDO, CA 91341-0563
PO BOX 564, SAN FERNANDO, CA 91341-0564
PO BOX 565, SAN FERNANDO, CA 91341-0565
PO BOX 566, SAN FERNANDO, CA 91341-0566
PO BOX 567, SAN FERNANDO, CA 91341-0567
PO BOX 568, SAN FERNANDO, CA 91341-0568
PO BOX 569, SAN FERNANDO, CA 91341-0569
PO BOX 570, SAN FERNANDO, CA 91341-0570
PO BOX 571, SAN FERNANDO, CA 91341-0571
PO BOX 572, SAN FERNANDO, CA 91341-0572
PO BOX 573, SAN FERNANDO, CA 91341-0573
PO BOX 574, SAN FERNANDO, CA 91341-0574
PO BOX 575, SAN FERNANDO, CA 91341-0575
PO BOX 576, SAN FERNANDO, CA 91341-0576
PO BOX 577, SAN FERNANDO, CA 91341-0577
PO BOX 578, SAN FERNANDO, CA 91341-0578
PO BOX 579, SAN FERNANDO, CA 91341-0579
PO BOX 580, SAN FERNANDO, CA 91341-0580
PO BOX 581, SAN FERNANDO, CA 91341-0581
PO BOX 582, SAN FERNANDO, CA 91341-0582
PO BOX 583, SAN FERNANDO, CA 91341-0583
PO BOX 584, SAN FERNANDO, CA 91341-0584
PO BOX 585, SAN FERNANDO, CA 91341-0585
PO BOX 586, SAN FERNANDO, CA 91341-0586
PO BOX 587, SAN FERNANDO, CA 91341-0587
PO BOX 588, SAN FERNANDO, CA 91341-0588
PO BOX 589, SAN FERNANDO, CA 91341-0589
PO BOX 590, SAN FERNANDO, CA 91341-0590
PO BOX 591, SAN FERNANDO, CA 91341-0591
PO BOX 592, SAN FERNANDO, CA 91341-0592
PO BOX 593, SAN FERNANDO, CA 91341-0593
PO BOX 594, SAN FERNANDO, CA 91341-0594
PO BOX 595, SAN FERNANDO, CA 91341-0595
PO BOX 596, SAN FERNANDO, CA 91341-0596
PO BOX 597, SAN FERNANDO, CA 91341-0597
PO BOX 598, SAN FERNANDO, CA 91341-0598
PO BOX 599, SAN FERNANDO, CA 91341-0599
PO BOX 600, SAN FERNANDO, CA 91341-0600
PO BOX 601, SAN FERNANDO, CA 91341-0601
PO BOX 602, SAN FERNANDO, CA 91341-0602
PO BOX 603, SAN FERNANDO, CA 91341-0603
PO BOX 604, SAN FERNANDO, CA 91341-0604
PO BOX 605, SAN FERNANDO, CA 91341-0605
PO BOX 606, SAN FERNANDO, CA 91341-0606
PO BOX 607, SAN FERNANDO, CA 91341-0607
PO BOX 608, SAN FERNANDO, CA 91341-0608
PO BOX 609, SAN FERNANDO, CA 91341-0609
PO BOX 610, SAN FERNANDO, CA 91341-0610
PO BOX 611, SAN FERNANDO, CA 91341-0611
PO BOX 612, SAN FERNANDO, CA 91341-0612
PO BOX 613, SAN FERNANDO, CA 91341-0613
PO BOX 614, SAN FERNANDO, CA 91341-0614
PO BOX 615, SAN FERNANDO, CA 91341-0615
PO BOX 616, SAN FERNANDO, CA 91341-0616
PO BOX 617, SAN FERNANDO, CA 91341-0617
PO BOX 618, SAN FERNANDO, CA 91341-0618
PO BOX 619, SAN FERNANDO, CA 91341-0619
PO BOX 620, SAN FERNANDO, CA 91341-0620
PO BOX 621, SAN FERNANDO, CA 91341-0621
PO BOX 622, SAN FERNANDO, CA 91341-0622
PO BOX 623, SAN FERNANDO, CA 91341-0623
PO BOX 624, SAN FERNANDO, CA 91341-0624
PO BOX 625, SAN FERNANDO, CA 91341-0625
PO BOX 626, SAN FERNANDO, CA 91341-0626
PO BOX 627, SAN FERNANDO, CA 91341-0627
PO BOX 628, SAN FERNANDO, CA 91341-0628
PO BOX 629, SAN FERNANDO, CA 91341-0629
PO BOX 630, SAN FERNANDO, CA 91341-0630
PO BOX 631, SAN FERNANDO, CA 91341-0631
PO BOX 632, SAN FERNANDO, CA 91341-0632
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