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 451, CARLSBAD, NM 88221-0451
PO BOX 452, CARLSBAD, NM 88221-0452
PO BOX 453, CARLSBAD, NM 88221-0453
PO BOX 454, CARLSBAD, NM 88221-0454
PO BOX 455, CARLSBAD, NM 88221-0455
PO BOX 456, CARLSBAD, NM 88221-0456
PO BOX 457, CARLSBAD, NM 88221-0457
PO BOX 458, CARLSBAD, NM 88221-0458
PO BOX 459, CARLSBAD, NM 88221-0459
PO BOX 460, CARLSBAD, NM 88221-0460
PO BOX 461, CARLSBAD, NM 88221-0461
PO BOX 462, CARLSBAD, NM 88221-0462
PO BOX 463, CARLSBAD, NM 88221-0463
PO BOX 464, CARLSBAD, NM 88221-0464
PO BOX 465, CARLSBAD, NM 88221-0465
PO BOX 466, CARLSBAD, NM 88221-0466
PO BOX 467, CARLSBAD, NM 88221-0467
PO BOX 468, CARLSBAD, NM 88221-0468
PO BOX 469, CARLSBAD, NM 88221-0469
PO BOX 470, CARLSBAD, NM 88221-0470
PO BOX 471, CARLSBAD, NM 88221-0471
PO BOX 472, CARLSBAD, NM 88221-0472
PO BOX 473, CARLSBAD, NM 88221-0473
PO BOX 474, CARLSBAD, NM 88221-0474
PO BOX 475, CARLSBAD, NM 88221-0475
PO BOX 476, CARLSBAD, NM 88221-0476
PO BOX 477, CARLSBAD, NM 88221-0477
PO BOX 478, CARLSBAD, NM 88221-0478
PO BOX 479, CARLSBAD, NM 88221-0479
PO BOX 480, CARLSBAD, NM 88221-0480
PO BOX 481, CARLSBAD, NM 88221-0481
PO BOX 482, CARLSBAD, NM 88221-0482
PO BOX 483, CARLSBAD, NM 88221-0483
PO BOX 484, CARLSBAD, NM 88221-0484
PO BOX 485, CARLSBAD, NM 88221-0485
PO BOX 486, CARLSBAD, NM 88221-0486
PO BOX 487, CARLSBAD, NM 88221-0487
PO BOX 488, CARLSBAD, NM 88221-0488
PO BOX 489, CARLSBAD, NM 88221-0489
PO BOX 490, CARLSBAD, NM 88221-0490
PO BOX 491, CARLSBAD, NM 88221-0491
PO BOX 492, CARLSBAD, NM 88221-0492
PO BOX 493, CARLSBAD, NM 88221-0493
PO BOX 494, CARLSBAD, NM 88221-0494
PO BOX 495, CARLSBAD, NM 88221-0495
PO BOX 496, CARLSBAD, NM 88221-0496
PO BOX 497, CARLSBAD, NM 88221-0497
PO BOX 498, CARLSBAD, NM 88221-0498
PO BOX 499, CARLSBAD, NM 88221-0499
PO BOX 500, CARLSBAD, NM 88221-0500
PO BOX 501, CARLSBAD, NM 88221-0501
PO BOX 502, CARLSBAD, NM 88221-0502
PO BOX 503, CARLSBAD, NM 88221-0503
PO BOX 504, CARLSBAD, NM 88221-0504
PO BOX 505, CARLSBAD, NM 88221-0505
PO BOX 506, CARLSBAD, NM 88221-0506
PO BOX 507, CARLSBAD, NM 88221-0507
PO BOX 508, CARLSBAD, NM 88221-0508
PO BOX 509, CARLSBAD, NM 88221-0509
PO BOX 510, CARLSBAD, NM 88221-0510
PO BOX 511, CARLSBAD, NM 88221-0511
PO BOX 512, CARLSBAD, NM 88221-0512
PO BOX 513, CARLSBAD, NM 88221-0513
PO BOX 514, CARLSBAD, NM 88221-0514
PO BOX 515, CARLSBAD, NM 88221-0515
PO BOX 516, CARLSBAD, NM 88221-0516
PO BOX 517, CARLSBAD, NM 88221-0517
PO BOX 518, CARLSBAD, NM 88221-0518
PO BOX 519, CARLSBAD, NM 88221-0519
PO BOX 520, CARLSBAD, NM 88221-0520
PO BOX 521, CARLSBAD, NM 88221-0521
PO BOX 522, CARLSBAD, NM 88221-0522
PO BOX 523, CARLSBAD, NM 88221-0523
PO BOX 524, CARLSBAD, NM 88221-0524
PO BOX 525, CARLSBAD, NM 88221-0525
PO BOX 526, CARLSBAD, NM 88221-0526
PO BOX 527, CARLSBAD, NM 88221-0527
PO BOX 528, CARLSBAD, NM 88221-0528
PO BOX 529, CARLSBAD, NM 88221-0529
PO BOX 530, CARLSBAD, NM 88221-0530
PO BOX 531, CARLSBAD, NM 88221-0531
PO BOX 532, CARLSBAD, NM 88221-0532
PO BOX 533, CARLSBAD, NM 88221-0533
PO BOX 534, CARLSBAD, NM 88221-0534
PO BOX 535, CARLSBAD, NM 88221-0535
PO BOX 536, CARLSBAD, NM 88221-0536
PO BOX 537, CARLSBAD, NM 88221-0537
PO BOX 538, CARLSBAD, NM 88221-0538
PO BOX 539, CARLSBAD, NM 88221-0539
PO BOX 540, CARLSBAD, NM 88221-0540
PO BOX 541, CARLSBAD, NM 88221-0541
PO BOX 542, CARLSBAD, NM 88221-0542
PO BOX 543, CARLSBAD, NM 88221-0543
PO BOX 544, CARLSBAD, NM 88221-0544
PO BOX 545, CARLSBAD, NM 88221-0545
PO BOX 546, CARLSBAD, NM 88221-0546
PO BOX 547, CARLSBAD, NM 88221-0547
PO BOX 548, CARLSBAD, NM 88221-0548
PO BOX 549, CARLSBAD, NM 88221-0549
PO BOX 550, CARLSBAD, NM 88221-0550
PO BOX 551, CARLSBAD, NM 88221-0551
PO BOX 552, CARLSBAD, NM 88221-0552
PO BOX 553, CARLSBAD, NM 88221-0553
PO BOX 554, CARLSBAD, NM 88221-0554
PO BOX 555, CARLSBAD, NM 88221-0555
PO BOX 556, CARLSBAD, NM 88221-0556
PO BOX 557, CARLSBAD, NM 88221-0557
PO BOX 558, CARLSBAD, NM 88221-0558
PO BOX 559, CARLSBAD, NM 88221-0559
PO BOX 560, CARLSBAD, NM 88221-0560
PO BOX 561, CARLSBAD, NM 88221-0561
PO BOX 562, CARLSBAD, NM 88221-0562
PO BOX 563, CARLSBAD, NM 88221-0563
PO BOX 564, CARLSBAD, NM 88221-0564
PO BOX 565, CARLSBAD, NM 88221-0565
PO BOX 566, CARLSBAD, NM 88221-0566
PO BOX 567, CARLSBAD, NM 88221-0567
PO BOX 568, CARLSBAD, NM 88221-0568
PO BOX 569, CARLSBAD, NM 88221-0569
PO BOX 570, CARLSBAD, NM 88221-0570
PO BOX 571, CARLSBAD, NM 88221-0571
PO BOX 572, CARLSBAD, NM 88221-0572
PO BOX 573, CARLSBAD, NM 88221-0573
PO BOX 574, CARLSBAD, NM 88221-0574
PO BOX 575, CARLSBAD, NM 88221-0575
PO BOX 576, CARLSBAD, NM 88221-0576
PO BOX 577, CARLSBAD, NM 88221-0577
PO BOX 578, CARLSBAD, NM 88221-0578
PO BOX 579, CARLSBAD, NM 88221-0579
PO BOX 580, CARLSBAD, NM 88221-0580
PO BOX 581, CARLSBAD, NM 88221-0581
PO BOX 582, CARLSBAD, NM 88221-0582
PO BOX 583, CARLSBAD, NM 88221-0583
PO BOX 584, CARLSBAD, NM 88221-0584
PO BOX 585, CARLSBAD, NM 88221-0585
PO BOX 586, CARLSBAD, NM 88221-0586
PO BOX 587, CARLSBAD, NM 88221-0587
PO BOX 588, CARLSBAD, NM 88221-0588
PO BOX 589, CARLSBAD, NM 88221-0589
PO BOX 590, CARLSBAD, NM 88221-0590
PO BOX 591, CARLSBAD, NM 88221-0591
PO BOX 592, CARLSBAD, NM 88221-0592
PO BOX 593, CARLSBAD, NM 88221-0593
PO BOX 594, CARLSBAD, NM 88221-0594
PO BOX 595, CARLSBAD, NM 88221-0595
PO BOX 596, CARLSBAD, NM 88221-0596
PO BOX 597, CARLSBAD, NM 88221-0597
PO BOX 598, CARLSBAD, NM 88221-0598
PO BOX 599, CARLSBAD, NM 88221-0599
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