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, GLENDALE, CA 91209-0481
PO BOX 482, GLENDALE, CA 91209-0482
PO BOX 483, GLENDALE, CA 91209-0483
PO BOX 484, GLENDALE, CA 91209-0484
PO BOX 485, GLENDALE, CA 91209-0485
PO BOX 486, GLENDALE, CA 91209-0486
PO BOX 487, GLENDALE, CA 91209-0487
PO BOX 488, GLENDALE, CA 91209-0488
PO BOX 489, GLENDALE, CA 91209-0489
PO BOX 490, GLENDALE, CA 91209-0490
PO BOX 491, GLENDALE, CA 91209-0491
PO BOX 492, GLENDALE, CA 91209-0492
PO BOX 493, GLENDALE, CA 91209-0493
PO BOX 494, GLENDALE, CA 91209-0494
PO BOX 495, GLENDALE, CA 91209-0495
PO BOX 496, GLENDALE, CA 91209-0496
PO BOX 497, GLENDALE, CA 91209-0497
PO BOX 498, GLENDALE, CA 91209-0498
PO BOX 499, GLENDALE, CA 91209-0499
PO BOX 500, GLENDALE, CA 91209-0500
PO BOX 501, GLENDALE, CA 91209-0501
PO BOX 502, GLENDALE, CA 91209-0502
PO BOX 503, GLENDALE, CA 91209-0503
PO BOX 504, GLENDALE, CA 91209-0504
PO BOX 505, GLENDALE, CA 91209-0505
PO BOX 506, GLENDALE, CA 91209-0506
PO BOX 507, GLENDALE, CA 91209-0507
PO BOX 508, GLENDALE, CA 91209-0508
PO BOX 509, GLENDALE, CA 91209-0509
PO BOX 510, GLENDALE, CA 91209-0510
PO BOX 511, GLENDALE, CA 91209-0511
PO BOX 512, GLENDALE, CA 91209-0512
PO BOX 513, GLENDALE, CA 91209-0513
PO BOX 514, GLENDALE, CA 91209-0514
PO BOX 515, GLENDALE, CA 91209-0515
PO BOX 516, GLENDALE, CA 91209-0516
PO BOX 517, GLENDALE, CA 91209-0517
PO BOX 518, GLENDALE, CA 91209-0518
PO BOX 519, GLENDALE, CA 91209-0519
PO BOX 520, GLENDALE, CA 91209-0520
PO BOX 521, GLENDALE, CA 91209-0521
PO BOX 522, GLENDALE, CA 91209-0522
PO BOX 523, GLENDALE, CA 91209-0523
PO BOX 524, GLENDALE, CA 91209-0524
PO BOX 525, GLENDALE, CA 91209-0525
PO BOX 526, GLENDALE, CA 91209-0526
PO BOX 527, GLENDALE, CA 91209-0527
PO BOX 528, GLENDALE, CA 91209-0528
PO BOX 529, GLENDALE, CA 91209-0529
PO BOX 530, GLENDALE, CA 91209-0530
PO BOX 531, GLENDALE, CA 91209-0531
PO BOX 532, GLENDALE, CA 91209-0532
PO BOX 533, GLENDALE, CA 91209-0533
PO BOX 534, GLENDALE, CA 91209-0534
PO BOX 535, GLENDALE, CA 91209-0535
PO BOX 536, GLENDALE, CA 91209-0536
PO BOX 537, GLENDALE, CA 91209-0537
PO BOX 538, GLENDALE, CA 91209-0538
PO BOX 539, GLENDALE, CA 91209-0539
PO BOX 540, GLENDALE, CA 91209-0540
PO BOX 541, GLENDALE, CA 91209-0541
PO BOX 542, GLENDALE, CA 91209-0542
PO BOX 543, GLENDALE, CA 91209-0543
PO BOX 544, GLENDALE, CA 91209-0544
PO BOX 545, GLENDALE, CA 91209-0545
PO BOX 546, GLENDALE, CA 91209-0546
PO BOX 547, GLENDALE, CA 91209-0547
PO BOX 548, GLENDALE, CA 91209-0548
PO BOX 549, GLENDALE, CA 91209-0549
PO BOX 550, GLENDALE, CA 91209-0550
PO BOX 551, GLENDALE, CA 91209-0551
PO BOX 552, GLENDALE, CA 91209-0552
PO BOX 553, GLENDALE, CA 91209-0553
PO BOX 554, GLENDALE, CA 91209-0554
PO BOX 555, GLENDALE, CA 91209-0555
PO BOX 556, GLENDALE, CA 91209-0556
PO BOX 557, GLENDALE, CA 91209-0557
PO BOX 558, GLENDALE, CA 91209-0558
PO BOX 559, GLENDALE, CA 91209-0559
PO BOX 560, GLENDALE, CA 91209-0560
PO BOX 561, GLENDALE, CA 91209-0561
PO BOX 562, GLENDALE, CA 91209-0562
PO BOX 563, GLENDALE, CA 91209-0563
PO BOX 564, GLENDALE, CA 91209-0564
PO BOX 565, GLENDALE, CA 91209-0565
PO BOX 566, GLENDALE, CA 91209-0566
PO BOX 567, GLENDALE, CA 91209-0567
PO BOX 568, GLENDALE, CA 91209-0568
PO BOX 569, GLENDALE, CA 91209-0569
PO BOX 570, GLENDALE, CA 91209-0570
PO BOX 571, GLENDALE, CA 91209-0571
PO BOX 572, GLENDALE, CA 91209-0572
PO BOX 573, GLENDALE, CA 91209-0573
PO BOX 574, GLENDALE, CA 91209-0574
PO BOX 575, GLENDALE, CA 91209-0575
PO BOX 576, GLENDALE, CA 91209-0576
PO BOX 577, GLENDALE, CA 91209-0577
PO BOX 578, GLENDALE, CA 91209-0578
PO BOX 579, GLENDALE, CA 91209-0579
PO BOX 580, GLENDALE, CA 91209-0580
PO BOX 581, GLENDALE, CA 91209-0581
PO BOX 582, GLENDALE, CA 91209-0582
PO BOX 583, GLENDALE, CA 91209-0583
PO BOX 584, GLENDALE, CA 91209-0584
PO BOX 585, GLENDALE, CA 91209-0585
PO BOX 586, GLENDALE, CA 91209-0586
PO BOX 587, GLENDALE, CA 91209-0587
PO BOX 588, GLENDALE, CA 91209-0588
PO BOX 589, GLENDALE, CA 91209-0589
PO BOX 590, GLENDALE, CA 91209-0590
PO BOX 591, GLENDALE, CA 91209-0591
PO BOX 592, GLENDALE, CA 91209-0592
PO BOX 593, GLENDALE, CA 91209-0593
PO BOX 594, GLENDALE, CA 91209-0594
PO BOX 595, GLENDALE, CA 91209-0595
PO BOX 596, GLENDALE, CA 91209-0596
PO BOX 597, GLENDALE, CA 91209-0597
PO BOX 598, GLENDALE, CA 91209-0598
PO BOX 599, GLENDALE, CA 91209-0599
PO BOX 600, GLENDALE, CA 91209-0600
PO BOX 601, GLENDALE, CA 91209-0601
PO BOX 602, GLENDALE, CA 91209-0602
PO BOX 603, GLENDALE, CA 91209-0603
PO BOX 604, GLENDALE, CA 91209-0604
PO BOX 605, GLENDALE, CA 91209-0605
PO BOX 606, GLENDALE, CA 91209-0606
PO BOX 607, GLENDALE, CA 91209-0607
PO BOX 608, GLENDALE, CA 91209-0608
PO BOX 609, GLENDALE, CA 91209-0609
PO BOX 610, GLENDALE, CA 91209-0610
PO BOX 611, GLENDALE, CA 91209-0611
PO BOX 612, GLENDALE, CA 91209-0612
PO BOX 613, GLENDALE, CA 91209-0613
PO BOX 614, GLENDALE, CA 91209-0614
PO BOX 615, GLENDALE, CA 91209-0615
PO BOX 616, GLENDALE, CA 91209-0616
PO BOX 617, GLENDALE, CA 91209-0617
PO BOX 618, GLENDALE, CA 91209-0618
PO BOX 619, GLENDALE, CA 91209-0619
PO BOX 620, GLENDALE, CA 91209-0620
PO BOX 621, GLENDALE, CA 91209-0621
PO BOX 622, GLENDALE, CA 91209-0622
PO BOX 623, GLENDALE, CA 91209-0623
PO BOX 624, GLENDALE, CA 91209-0624
PO BOX 625, GLENDALE, CA 91209-0625
PO BOX 626, GLENDALE, CA 91209-0626
PO BOX 627, GLENDALE, CA 91209-0627
PO BOX 628, GLENDALE, CA 91209-0628
PO BOX 629, GLENDALE, CA 91209-0629
PO BOX 630, GLENDALE, CA 91209-0630
PO BOX 631, GLENDALE, CA 91209-0631
PO BOX 632, GLENDALE, CA 91209-0632
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