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, SANTA PAULA, CA 93061-0481
PO BOX 482, SANTA PAULA, CA 93061-0482
PO BOX 483, SANTA PAULA, CA 93061-0483
PO BOX 484, SANTA PAULA, CA 93061-0484
PO BOX 485, SANTA PAULA, CA 93061-0485
PO BOX 486, SANTA PAULA, CA 93061-0486
PO BOX 487, SANTA PAULA, CA 93061-0487
PO BOX 488, SANTA PAULA, CA 93061-0488
PO BOX 489, SANTA PAULA, CA 93061-0489
PO BOX 490, SANTA PAULA, CA 93061-0490
PO BOX 491, SANTA PAULA, CA 93061-0491
PO BOX 492, SANTA PAULA, CA 93061-0492
PO BOX 493, SANTA PAULA, CA 93061-0493
PO BOX 494, SANTA PAULA, CA 93061-0494
PO BOX 495, SANTA PAULA, CA 93061-0495
PO BOX 496, SANTA PAULA, CA 93061-0496
PO BOX 497, SANTA PAULA, CA 93061-0497
PO BOX 498, SANTA PAULA, CA 93061-0498
PO BOX 499, SANTA PAULA, CA 93061-0499
PO BOX 500, SANTA PAULA, CA 93061-0500
PO BOX 501, SANTA PAULA, CA 93061-0501
PO BOX 502, SANTA PAULA, CA 93061-0502
PO BOX 503, SANTA PAULA, CA 93061-0503
PO BOX 504, SANTA PAULA, CA 93061-0504
PO BOX 505, SANTA PAULA, CA 93061-0505
PO BOX 506, SANTA PAULA, CA 93061-0506
PO BOX 507, SANTA PAULA, CA 93061-0507
PO BOX 508, SANTA PAULA, CA 93061-0508
PO BOX 509, SANTA PAULA, CA 93061-0509
PO BOX 510, SANTA PAULA, CA 93061-0510
PO BOX 511, SANTA PAULA, CA 93061-0511
PO BOX 512, SANTA PAULA, CA 93061-0512
PO BOX 513, SANTA PAULA, CA 93061-0513
PO BOX 514, SANTA PAULA, CA 93061-0514
PO BOX 515, SANTA PAULA, CA 93061-0515
PO BOX 516, SANTA PAULA, CA 93061-0516
PO BOX 517, SANTA PAULA, CA 93061-0517
PO BOX 518, SANTA PAULA, CA 93061-0518
PO BOX 519, SANTA PAULA, CA 93061-0519
PO BOX 520, SANTA PAULA, CA 93061-0520
PO BOX 521, SANTA PAULA, CA 93061-0521
PO BOX 522, SANTA PAULA, CA 93061-0522
PO BOX 523, SANTA PAULA, CA 93061-0523
PO BOX 524, SANTA PAULA, CA 93061-0524
PO BOX 525, SANTA PAULA, CA 93061-0525
PO BOX 526, SANTA PAULA, CA 93061-0526
PO BOX 527, SANTA PAULA, CA 93061-0527
PO BOX 528, SANTA PAULA, CA 93061-0528
PO BOX 529, SANTA PAULA, CA 93061-0529
PO BOX 530, SANTA PAULA, CA 93061-0530
PO BOX 531, SANTA PAULA, CA 93061-0531
PO BOX 532, SANTA PAULA, CA 93061-0532
PO BOX 533, SANTA PAULA, CA 93061-0533
PO BOX 534, SANTA PAULA, CA 93061-0534
PO BOX 535, SANTA PAULA, CA 93061-0535
PO BOX 536, SANTA PAULA, CA 93061-0536
PO BOX 537, SANTA PAULA, CA 93061-0537
PO BOX 538, SANTA PAULA, CA 93061-0538
PO BOX 539, SANTA PAULA, CA 93061-0539
PO BOX 540, SANTA PAULA, CA 93061-0540
PO BOX 541, SANTA PAULA, CA 93061-0541
PO BOX 542, SANTA PAULA, CA 93061-0542
PO BOX 543, SANTA PAULA, CA 93061-0543
PO BOX 544, SANTA PAULA, CA 93061-0544
PO BOX 545, SANTA PAULA, CA 93061-0545
PO BOX 546, SANTA PAULA, CA 93061-0546
PO BOX 547, SANTA PAULA, CA 93061-0547
PO BOX 548, SANTA PAULA, CA 93061-0548
PO BOX 549, SANTA PAULA, CA 93061-0549
PO BOX 550, SANTA PAULA, CA 93061-0550
PO BOX 551, SANTA PAULA, CA 93061-0551
PO BOX 552, SANTA PAULA, CA 93061-0552
PO BOX 553, SANTA PAULA, CA 93061-0553
PO BOX 554, SANTA PAULA, CA 93061-0554
PO BOX 555, SANTA PAULA, CA 93061-0555
PO BOX 556, SANTA PAULA, CA 93061-0556
PO BOX 557, SANTA PAULA, CA 93061-0557
PO BOX 558, SANTA PAULA, CA 93061-0558
PO BOX 559, SANTA PAULA, CA 93061-0559
PO BOX 560, SANTA PAULA, CA 93061-0560
PO BOX 561, SANTA PAULA, CA 93061-0561
PO BOX 562, SANTA PAULA, CA 93061-0562
PO BOX 563, SANTA PAULA, CA 93061-0563
PO BOX 564, SANTA PAULA, CA 93061-0564
PO BOX 565, SANTA PAULA, CA 93061-0565
PO BOX 566, SANTA PAULA, CA 93061-0566
PO BOX 567, SANTA PAULA, CA 93061-0567
PO BOX 568, SANTA PAULA, CA 93061-0568
PO BOX 569, SANTA PAULA, CA 93061-0569
PO BOX 570, SANTA PAULA, CA 93061-0570
PO BOX 571, SANTA PAULA, CA 93061-0571
PO BOX 572, SANTA PAULA, CA 93061-0572
PO BOX 573, SANTA PAULA, CA 93061-0573
PO BOX 574, SANTA PAULA, CA 93061-0574
PO BOX 575, SANTA PAULA, CA 93061-0575
PO BOX 576, SANTA PAULA, CA 93061-0576
PO BOX 577, SANTA PAULA, CA 93061-0577
PO BOX 578, SANTA PAULA, CA 93061-0578
PO BOX 579, SANTA PAULA, CA 93061-0579
PO BOX 580, SANTA PAULA, CA 93061-0580
PO BOX 581, SANTA PAULA, CA 93061-0581
PO BOX 582, SANTA PAULA, CA 93061-0582
PO BOX 583, SANTA PAULA, CA 93061-0583
PO BOX 584, SANTA PAULA, CA 93061-0584
PO BOX 585, SANTA PAULA, CA 93061-0585
PO BOX 586, SANTA PAULA, CA 93061-0586
PO BOX 587, SANTA PAULA, CA 93061-0587
PO BOX 588, SANTA PAULA, CA 93061-0588
PO BOX 589, SANTA PAULA, CA 93061-0589
PO BOX 590, SANTA PAULA, CA 93061-0590
PO BOX 591, SANTA PAULA, CA 93061-0591
PO BOX 592, SANTA PAULA, CA 93061-0592
PO BOX 593, SANTA PAULA, CA 93061-0593
PO BOX 594, SANTA PAULA, CA 93061-0594
PO BOX 595, SANTA PAULA, CA 93061-0595
PO BOX 596, SANTA PAULA, CA 93061-0596
PO BOX 597, SANTA PAULA, CA 93061-0597
PO BOX 598, SANTA PAULA, CA 93061-0598
PO BOX 599, SANTA PAULA, CA 93061-0599
PO BOX 600, SANTA PAULA, CA 93061-0600
PO BOX 601, SANTA PAULA, CA 93061-0601
PO BOX 602, SANTA PAULA, CA 93061-0602
PO BOX 603, SANTA PAULA, CA 93061-0603
PO BOX 604, SANTA PAULA, CA 93061-0604
PO BOX 605, SANTA PAULA, CA 93061-0605
PO BOX 606, SANTA PAULA, CA 93061-0606
PO BOX 607, SANTA PAULA, CA 93061-0607
PO BOX 608, SANTA PAULA, CA 93061-0608
PO BOX 609, SANTA PAULA, CA 93061-0609
PO BOX 610, SANTA PAULA, CA 93061-0610
PO BOX 611, SANTA PAULA, CA 93061-0611
PO BOX 612, SANTA PAULA, CA 93061-0612
PO BOX 613, SANTA PAULA, CA 93061-0613
PO BOX 614, SANTA PAULA, CA 93061-0614
PO BOX 615, SANTA PAULA, CA 93061-0615
PO BOX 616, SANTA PAULA, CA 93061-0616
PO BOX 617, SANTA PAULA, CA 93061-0617
PO BOX 618, SANTA PAULA, CA 93061-0618
PO BOX 619, SANTA PAULA, CA 93061-0619
PO BOX 620, SANTA PAULA, CA 93061-0620
PO BOX 621, SANTA PAULA, CA 93061-0621
PO BOX 622, SANTA PAULA, CA 93061-0622
PO BOX 623, SANTA PAULA, CA 93061-0623
PO BOX 624, SANTA PAULA, CA 93061-0624
PO BOX 625, SANTA PAULA, CA 93061-0625
PO BOX 626, SANTA PAULA, CA 93061-0626
PO BOX 627, SANTA PAULA, CA 93061-0627
PO BOX 628, SANTA PAULA, CA 93061-0628
PO BOX 629, SANTA PAULA, CA 93061-0629
PO BOX 630, SANTA PAULA, CA 93061-0630
PO BOX 631, SANTA PAULA, CA 93061-0631
PO BOX 632, SANTA PAULA, CA 93061-0632
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