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, LA JOLLA, CA 92038-0421
PO BOX 422, LA JOLLA, CA 92038-0422
PO BOX 423, LA JOLLA, CA 92038-0423
PO BOX 424, LA JOLLA, CA 92038-0424
PO BOX 425, LA JOLLA, CA 92038-0425
PO BOX 426, LA JOLLA, CA 92038-0426
PO BOX 427, LA JOLLA, CA 92038-0427
PO BOX 428, LA JOLLA, CA 92038-0428
PO BOX 429, LA JOLLA, CA 92038-0429
PO BOX 430, LA JOLLA, CA 92038-0430
PO BOX 431, LA JOLLA, CA 92038-0431
PO BOX 432, LA JOLLA, CA 92038-0432
PO BOX 433, LA JOLLA, CA 92038-0433
PO BOX 434, LA JOLLA, CA 92038-0434
PO BOX 435, LA JOLLA, CA 92038-0435
PO BOX 436, LA JOLLA, CA 92038-0436
PO BOX 437, LA JOLLA, CA 92038-0437
PO BOX 438, LA JOLLA, CA 92038-0438
PO BOX 439, LA JOLLA, CA 92038-0439
PO BOX 440, LA JOLLA, CA 92038-0440
PO BOX 441, LA JOLLA, CA 92038-0441
PO BOX 442, LA JOLLA, CA 92038-0442
PO BOX 443, LA JOLLA, CA 92038-0443
PO BOX 444, LA JOLLA, CA 92038-0444
PO BOX 445, LA JOLLA, CA 92038-0445
PO BOX 446, LA JOLLA, CA 92038-0446
PO BOX 447, LA JOLLA, CA 92038-0447
PO BOX 448, LA JOLLA, CA 92038-0448
PO BOX 449, LA JOLLA, CA 92038-0449
PO BOX 450, LA JOLLA, CA 92038-0450
PO BOX 451, LA JOLLA, CA 92038-0451
PO BOX 452, LA JOLLA, CA 92038-0452
PO BOX 453, LA JOLLA, CA 92038-0453
PO BOX 454, LA JOLLA, CA 92038-0454
PO BOX 455, LA JOLLA, CA 92038-0455
PO BOX 456, LA JOLLA, CA 92038-0456
PO BOX 457, LA JOLLA, CA 92038-0457
PO BOX 458, LA JOLLA, CA 92038-0458
PO BOX 459, LA JOLLA, CA 92038-0459
PO BOX 460, LA JOLLA, CA 92038-0460
PO BOX 461, LA JOLLA, CA 92038-0461
PO BOX 462, LA JOLLA, CA 92038-0462
PO BOX 463, LA JOLLA, CA 92038-0463
PO BOX 464, LA JOLLA, CA 92038-0464
PO BOX 465, LA JOLLA, CA 92038-0465
PO BOX 466, LA JOLLA, CA 92038-0466
PO BOX 467, LA JOLLA, CA 92038-0467
PO BOX 468, LA JOLLA, CA 92038-0468
PO BOX 469, LA JOLLA, CA 92038-0469
PO BOX 470, LA JOLLA, CA 92038-0470
PO BOX 471, LA JOLLA, CA 92038-0471
PO BOX 472, LA JOLLA, CA 92038-0472
PO BOX 473, LA JOLLA, CA 92038-0473
PO BOX 474, LA JOLLA, CA 92038-0474
PO BOX 475, LA JOLLA, CA 92038-0475
PO BOX 476, LA JOLLA, CA 92038-0476
PO BOX 477, LA JOLLA, CA 92038-0477
PO BOX 478, LA JOLLA, CA 92038-0478
PO BOX 479, LA JOLLA, CA 92038-0479
PO BOX 480, LA JOLLA, CA 92038-0480
PO BOX 481, LA JOLLA, CA 92038-0481
PO BOX 482, LA JOLLA, CA 92038-0482
PO BOX 483, LA JOLLA, CA 92038-0483
PO BOX 484, LA JOLLA, CA 92038-0484
PO BOX 485, LA JOLLA, CA 92038-0485
PO BOX 486, LA JOLLA, CA 92038-0486
PO BOX 487, LA JOLLA, CA 92038-0487
PO BOX 488, LA JOLLA, CA 92038-0488
PO BOX 489, LA JOLLA, CA 92038-0489
PO BOX 490, LA JOLLA, CA 92038-0490
PO BOX 491, LA JOLLA, CA 92038-0491
PO BOX 492, LA JOLLA, CA 92038-0492
PO BOX 493, LA JOLLA, CA 92038-0493
PO BOX 494, LA JOLLA, CA 92038-0494
PO BOX 495, LA JOLLA, CA 92038-0495
PO BOX 496, LA JOLLA, CA 92038-0496
PO BOX 497, LA JOLLA, CA 92038-0497
PO BOX 498, LA JOLLA, CA 92038-0498
PO BOX 499, LA JOLLA, CA 92038-0499
PO BOX 500, LA JOLLA, CA 92038-0500
PO BOX 501, LA JOLLA, CA 92038-0501
PO BOX 502, LA JOLLA, CA 92038-0502
PO BOX 503, LA JOLLA, CA 92038-0503
PO BOX 504, LA JOLLA, CA 92038-0504
PO BOX 505, LA JOLLA, CA 92038-0505
PO BOX 506, LA JOLLA, CA 92038-0506
PO BOX 507, LA JOLLA, CA 92038-0507
PO BOX 508, LA JOLLA, CA 92038-0508
PO BOX 509, LA JOLLA, CA 92038-0509
PO BOX 510, LA JOLLA, CA 92038-0510
PO BOX 511, LA JOLLA, CA 92038-0511
PO BOX 512, LA JOLLA, CA 92038-0512
PO BOX 513, LA JOLLA, CA 92038-0513
PO BOX 514, LA JOLLA, CA 92038-0514
PO BOX 515, LA JOLLA, CA 92038-0515
PO BOX 516, LA JOLLA, CA 92038-0516
PO BOX 517, LA JOLLA, CA 92038-0517
PO BOX 518, LA JOLLA, CA 92038-0518
PO BOX 519, LA JOLLA, CA 92038-0519
PO BOX 520, LA JOLLA, CA 92038-0520
PO BOX 521, LA JOLLA, CA 92038-0521
PO BOX 522, LA JOLLA, CA 92038-0522
PO BOX 523, LA JOLLA, CA 92038-0523
PO BOX 524, LA JOLLA, CA 92038-0524
PO BOX 525, LA JOLLA, CA 92038-0525
PO BOX 526, LA JOLLA, CA 92038-0526
PO BOX 527, LA JOLLA, CA 92038-0527
PO BOX 528, LA JOLLA, CA 92038-0528
PO BOX 529, LA JOLLA, CA 92038-0529
PO BOX 530, LA JOLLA, CA 92038-0530
PO BOX 531, LA JOLLA, CA 92038-0531
PO BOX 532, LA JOLLA, CA 92038-0532
PO BOX 533, LA JOLLA, CA 92038-0533
PO BOX 534, LA JOLLA, CA 92038-0534
PO BOX 535, LA JOLLA, CA 92038-0535
PO BOX 536, LA JOLLA, CA 92038-0536
PO BOX 537, LA JOLLA, CA 92038-0537
PO BOX 538, LA JOLLA, CA 92038-0538
PO BOX 539, LA JOLLA, CA 92038-0539
PO BOX 540, LA JOLLA, CA 92038-0540
PO BOX 541, LA JOLLA, CA 92038-0541
PO BOX 542, LA JOLLA, CA 92038-0542
PO BOX 543, LA JOLLA, CA 92038-0543
PO BOX 544, LA JOLLA, CA 92038-0544
PO BOX 545, LA JOLLA, CA 92038-0545
PO BOX 546, LA JOLLA, CA 92038-0546
PO BOX 547, LA JOLLA, CA 92038-0547
PO BOX 548, LA JOLLA, CA 92038-0548
PO BOX 549, LA JOLLA, CA 92038-0549
PO BOX 550, LA JOLLA, CA 92038-0550
PO BOX 551, LA JOLLA, CA 92038-0551
PO BOX 552, LA JOLLA, CA 92038-0552
PO BOX 553, LA JOLLA, CA 92038-0553
PO BOX 554, LA JOLLA, CA 92038-0554
PO BOX 555, LA JOLLA, CA 92038-0555
PO BOX 556, LA JOLLA, CA 92038-0556
PO BOX 557, LA JOLLA, CA 92038-0557
PO BOX 558, LA JOLLA, CA 92038-0558
PO BOX 559, LA JOLLA, CA 92038-0559
PO BOX 560, LA JOLLA, CA 92038-0560
PO BOX 561, LA JOLLA, CA 92038-0561
PO BOX 562, LA JOLLA, CA 92038-0562
PO BOX 563, LA JOLLA, CA 92038-0563
PO BOX 564, LA JOLLA, CA 92038-0564
PO BOX 565, LA JOLLA, CA 92038-0565
PO BOX 566, LA JOLLA, CA 92038-0566
PO BOX 567, LA JOLLA, CA 92038-0567
PO BOX 568, LA JOLLA, CA 92038-0568
PO BOX 569, LA JOLLA, CA 92038-0569
PO BOX 570, LA JOLLA, CA 92038-0570
PO BOX 571, LA JOLLA, CA 92038-0571
PO BOX 572, LA JOLLA, CA 92038-0572
PO BOX 573, LA JOLLA, CA 92038-0573
PO BOX 574, LA JOLLA, CA 92038-0574
PO BOX 575, LA JOLLA, CA 92038-0575
PO BOX 576, LA JOLLA, CA 92038-0576
PO BOX 577, LA JOLLA, CA 92038-0577
PO BOX 578, LA JOLLA, CA 92038-0578
PO BOX 579, LA JOLLA, CA 92038-0579
PO BOX 580, LA JOLLA, CA 92038-0580
PO BOX 581, LA JOLLA, CA 92038-0581
PO BOX 582, LA JOLLA, CA 92038-0582
PO BOX 583, LA JOLLA, CA 92038-0583
PO BOX 584, LA JOLLA, CA 92038-0584
PO BOX 585, LA JOLLA, CA 92038-0585
PO BOX 586, LA JOLLA, CA 92038-0586
PO BOX 587, LA JOLLA, CA 92038-0587
PO BOX 588, LA JOLLA, CA 92038-0588
PO BOX 589, LA JOLLA, CA 92038-0589
PO BOX 590, LA JOLLA, CA 92038-0590
PO BOX 591, LA JOLLA, CA 92038-0591
PO BOX 592, LA JOLLA, CA 92038-0592
PO BOX 593, LA JOLLA, CA 92038-0593
PO BOX 594, LA JOLLA, CA 92038-0594
PO BOX 595, LA JOLLA, CA 92038-0595
PO BOX 596, LA JOLLA, CA 92038-0596
PO BOX 597, LA JOLLA, CA 92038-0597
PO BOX 598, LA JOLLA, CA 92038-0598
PO BOX 599, LA JOLLA, CA 92038-0599
PO BOX 600, LA JOLLA, CA 92038-0600
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