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 421, OCEANSIDE, CA 92049-0421
PO BOX 422, OCEANSIDE, CA 92049-0422
PO BOX 423, OCEANSIDE, CA 92049-0423
PO BOX 424, OCEANSIDE, CA 92049-0424
PO BOX 425, OCEANSIDE, CA 92049-0425
PO BOX 426, OCEANSIDE, CA 92049-0426
PO BOX 427, OCEANSIDE, CA 92049-0427
PO BOX 428, OCEANSIDE, CA 92049-0428
PO BOX 429, OCEANSIDE, CA 92049-0429
PO BOX 430, OCEANSIDE, CA 92049-0430
PO BOX 431, OCEANSIDE, CA 92049-0431
PO BOX 432, OCEANSIDE, CA 92049-0432
PO BOX 433, OCEANSIDE, CA 92049-0433
PO BOX 434, OCEANSIDE, CA 92049-0434
PO BOX 435, OCEANSIDE, CA 92049-0435
PO BOX 436, OCEANSIDE, CA 92049-0436
PO BOX 437, OCEANSIDE, CA 92049-0437
PO BOX 438, OCEANSIDE, CA 92049-0438
PO BOX 439, OCEANSIDE, CA 92049-0439
PO BOX 440, OCEANSIDE, CA 92049-0440
PO BOX 441, OCEANSIDE, CA 92049-0441
PO BOX 442, OCEANSIDE, CA 92049-0442
PO BOX 443, OCEANSIDE, CA 92049-0443
PO BOX 444, OCEANSIDE, CA 92049-0444
PO BOX 445, OCEANSIDE, CA 92049-0445
PO BOX 446, OCEANSIDE, CA 92049-0446
PO BOX 447, OCEANSIDE, CA 92049-0447
PO BOX 448, OCEANSIDE, CA 92049-0448
PO BOX 449, OCEANSIDE, CA 92049-0449
PO BOX 450, OCEANSIDE, CA 92049-0450
PO BOX 451, OCEANSIDE, CA 92049-0451
PO BOX 452, OCEANSIDE, CA 92049-0452
PO BOX 453, OCEANSIDE, CA 92049-0453
PO BOX 454, OCEANSIDE, CA 92049-0454
PO BOX 455, OCEANSIDE, CA 92049-0455
PO BOX 456, OCEANSIDE, CA 92049-0456
PO BOX 457, OCEANSIDE, CA 92049-0457
PO BOX 458, OCEANSIDE, CA 92049-0458
PO BOX 459, OCEANSIDE, CA 92049-0459
PO BOX 460, OCEANSIDE, CA 92049-0460
PO BOX 461, OCEANSIDE, CA 92049-0461
PO BOX 462, OCEANSIDE, CA 92049-0462
PO BOX 463, OCEANSIDE, CA 92049-0463
PO BOX 464, OCEANSIDE, CA 92049-0464
PO BOX 465, OCEANSIDE, CA 92049-0465
PO BOX 466, OCEANSIDE, CA 92049-0466
PO BOX 467, OCEANSIDE, CA 92049-0467
PO BOX 468, OCEANSIDE, CA 92049-0468
PO BOX 469, OCEANSIDE, CA 92049-0469
PO BOX 470, OCEANSIDE, CA 92049-0470
PO BOX 471, OCEANSIDE, CA 92049-0471
PO BOX 472, OCEANSIDE, CA 92049-0472
PO BOX 473, OCEANSIDE, CA 92049-0473
PO BOX 474, OCEANSIDE, CA 92049-0474
PO BOX 475, OCEANSIDE, CA 92049-0475
PO BOX 476, OCEANSIDE, CA 92049-0476
PO BOX 477, OCEANSIDE, CA 92049-0477
PO BOX 478, OCEANSIDE, CA 92049-0478
PO BOX 479, OCEANSIDE, CA 92049-0479
PO BOX 480, OCEANSIDE, CA 92049-0480
PO BOX 481, OCEANSIDE, CA 92049-0481
PO BOX 482, OCEANSIDE, CA 92049-0482
PO BOX 483, OCEANSIDE, CA 92049-0483
PO BOX 484, OCEANSIDE, CA 92049-0484
PO BOX 485, OCEANSIDE, CA 92049-0485
PO BOX 486, OCEANSIDE, CA 92049-0486
PO BOX 487, OCEANSIDE, CA 92049-0487
PO BOX 488, OCEANSIDE, CA 92049-0488
PO BOX 489, OCEANSIDE, CA 92049-0489
PO BOX 490, OCEANSIDE, CA 92049-0490
PO BOX 491, OCEANSIDE, CA 92049-0491
PO BOX 492, OCEANSIDE, CA 92049-0492
PO BOX 493, OCEANSIDE, CA 92049-0493
PO BOX 494, OCEANSIDE, CA 92049-0494
PO BOX 495, OCEANSIDE, CA 92049-0495
PO BOX 496, OCEANSIDE, CA 92049-0496
PO BOX 497, OCEANSIDE, CA 92049-0497
PO BOX 498, OCEANSIDE, CA 92049-0498
PO BOX 499, OCEANSIDE, CA 92049-0499
PO BOX 500, OCEANSIDE, CA 92049-0500
PO BOX 501, OCEANSIDE, CA 92049-0501
PO BOX 502, OCEANSIDE, CA 92049-0502
PO BOX 503, OCEANSIDE, CA 92049-0503
PO BOX 504, OCEANSIDE, CA 92049-0504
PO BOX 505, OCEANSIDE, CA 92049-0505
PO BOX 506, OCEANSIDE, CA 92049-0506
PO BOX 507, OCEANSIDE, CA 92049-0507
PO BOX 508, OCEANSIDE, CA 92049-0508
PO BOX 509, OCEANSIDE, CA 92049-0509
PO BOX 510, OCEANSIDE, CA 92049-0510
PO BOX 511, OCEANSIDE, CA 92049-0511
PO BOX 512, OCEANSIDE, CA 92049-0512
PO BOX 513, OCEANSIDE, CA 92049-0513
PO BOX 514, OCEANSIDE, CA 92049-0514
PO BOX 515, OCEANSIDE, CA 92049-0515
PO BOX 516, OCEANSIDE, CA 92049-0516
PO BOX 517, OCEANSIDE, CA 92049-0517
PO BOX 518, OCEANSIDE, CA 92049-0518
PO BOX 519, OCEANSIDE, CA 92049-0519
PO BOX 520, OCEANSIDE, CA 92049-0520
PO BOX 521, OCEANSIDE, CA 92049-0521
PO BOX 522, OCEANSIDE, CA 92049-0522
PO BOX 523, OCEANSIDE, CA 92049-0523
PO BOX 524, OCEANSIDE, CA 92049-0524
PO BOX 525, OCEANSIDE, CA 92049-0525
PO BOX 526, OCEANSIDE, CA 92049-0526
PO BOX 527, OCEANSIDE, CA 92049-0527
PO BOX 528, OCEANSIDE, CA 92049-0528
PO BOX 529, OCEANSIDE, CA 92049-0529
PO BOX 530, OCEANSIDE, CA 92049-0530
PO BOX 531, OCEANSIDE, CA 92049-0531
PO BOX 532, OCEANSIDE, CA 92049-0532
PO BOX 533, OCEANSIDE, CA 92049-0533
PO BOX 534, OCEANSIDE, CA 92049-0534
PO BOX 535, OCEANSIDE, CA 92049-0535
PO BOX 536, OCEANSIDE, CA 92049-0536
PO BOX 537, OCEANSIDE, CA 92049-0537
PO BOX 538, OCEANSIDE, CA 92049-0538
PO BOX 539, OCEANSIDE, CA 92049-0539
PO BOX 540, OCEANSIDE, CA 92049-0540
PO BOX 541, OCEANSIDE, CA 92049-0541
PO BOX 542, OCEANSIDE, CA 92049-0542
PO BOX 543, OCEANSIDE, CA 92049-0543
PO BOX 544, OCEANSIDE, CA 92049-0544
PO BOX 545, OCEANSIDE, CA 92049-0545
PO BOX 546, OCEANSIDE, CA 92049-0546
PO BOX 547, OCEANSIDE, CA 92049-0547
PO BOX 548, OCEANSIDE, CA 92049-0548
PO BOX 549, OCEANSIDE, CA 92049-0549
PO BOX 550, OCEANSIDE, CA 92049-0550
PO BOX 551, OCEANSIDE, CA 92049-0551
PO BOX 552, OCEANSIDE, CA 92049-0552
PO BOX 553, OCEANSIDE, CA 92049-0553
PO BOX 554, OCEANSIDE, CA 92049-0554
PO BOX 555, OCEANSIDE, CA 92049-0555
PO BOX 556, OCEANSIDE, CA 92049-0556
PO BOX 557, OCEANSIDE, CA 92049-0557
PO BOX 558, OCEANSIDE, CA 92049-0558
PO BOX 559, OCEANSIDE, CA 92049-0559
PO BOX 560, OCEANSIDE, CA 92049-0560
PO BOX 561, OCEANSIDE, CA 92049-0561
PO BOX 562, OCEANSIDE, CA 92049-0562
PO BOX 563, OCEANSIDE, CA 92049-0563
PO BOX 564, OCEANSIDE, CA 92049-0564
PO BOX 565, OCEANSIDE, CA 92049-0565
PO BOX 566, OCEANSIDE, CA 92049-0566
PO BOX 567, OCEANSIDE, CA 92049-0567
PO BOX 568, OCEANSIDE, CA 92049-0568
PO BOX 569, OCEANSIDE, CA 92049-0569
PO BOX 570, OCEANSIDE, CA 92049-0570
PO BOX 571, OCEANSIDE, CA 92049-0571
PO BOX 572, OCEANSIDE, CA 92049-0572
PO BOX 573, OCEANSIDE, CA 92049-0573
PO BOX 574, OCEANSIDE, CA 92049-0574
PO BOX 575, OCEANSIDE, CA 92049-0575
PO BOX 576, OCEANSIDE, CA 92049-0576
PO BOX 577, OCEANSIDE, CA 92049-0577
PO BOX 578, OCEANSIDE, CA 92049-0578
PO BOX 579, OCEANSIDE, CA 92049-0579
PO BOX 580, OCEANSIDE, CA 92049-0580
PO BOX 581, OCEANSIDE, CA 92049-0581
PO BOX 582, OCEANSIDE, CA 92049-0582
PO BOX 583, OCEANSIDE, CA 92049-0583
PO BOX 584, OCEANSIDE, CA 92049-0584
PO BOX 585, OCEANSIDE, CA 92049-0585
PO BOX 586, OCEANSIDE, CA 92049-0586
PO BOX 587, OCEANSIDE, CA 92049-0587
PO BOX 588, OCEANSIDE, CA 92049-0588
PO BOX 589, OCEANSIDE, CA 92049-0589
PO BOX 590, OCEANSIDE, CA 92049-0590
PO BOX 591, OCEANSIDE, CA 92049-0591
PO BOX 592, OCEANSIDE, CA 92049-0592
PO BOX 593, OCEANSIDE, CA 92049-0593
PO BOX 594, OCEANSIDE, CA 92049-0594
PO BOX 595, OCEANSIDE, CA 92049-0595
PO BOX 596, OCEANSIDE, CA 92049-0596
PO BOX 597, OCEANSIDE, CA 92049-0597
PO BOX 598, OCEANSIDE, CA 92049-0598
PO BOX 599, OCEANSIDE, CA 92049-0599
PO BOX 600, OCEANSIDE, CA 92049-0600
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