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 391, INDIO, CA 92202-0391
PO BOX 392, INDIO, CA 92202-0392
PO BOX 393, INDIO, CA 92202-0393
PO BOX 394, INDIO, CA 92202-0394
PO BOX 395, INDIO, CA 92202-0395
PO BOX 396, INDIO, CA 92202-0396
PO BOX 397, INDIO, CA 92202-0397
PO BOX 398, INDIO, CA 92202-0398
PO BOX 399, INDIO, CA 92202-0399
PO BOX 400, INDIO, CA 92202-0400
PO BOX 401, INDIO, CA 92202-0401
PO BOX 402, INDIO, CA 92202-0402
PO BOX 403, INDIO, CA 92202-0403
PO BOX 404, INDIO, CA 92202-0404
PO BOX 405, INDIO, CA 92202-0405
PO BOX 406, INDIO, CA 92202-0406
PO BOX 407, INDIO, CA 92202-0407
PO BOX 408, INDIO, CA 92202-0408
PO BOX 409, INDIO, CA 92202-0409
PO BOX 410, INDIO, CA 92202-0410
PO BOX 411, INDIO, CA 92202-0411
PO BOX 412, INDIO, CA 92202-0412
PO BOX 413, INDIO, CA 92202-0413
PO BOX 414, INDIO, CA 92202-0414
PO BOX 415, INDIO, CA 92202-0415
PO BOX 416, INDIO, CA 92202-0416
PO BOX 417, INDIO, CA 92202-0417
PO BOX 418, INDIO, CA 92202-0418
PO BOX 419, INDIO, CA 92202-0419
PO BOX 420, INDIO, CA 92202-0420
PO BOX 421, INDIO, CA 92202-0421
PO BOX 422, INDIO, CA 92202-0422
PO BOX 423, INDIO, CA 92202-0423
PO BOX 424, INDIO, CA 92202-0424
PO BOX 425, INDIO, CA 92202-0425
PO BOX 426, INDIO, CA 92202-0426
PO BOX 427, INDIO, CA 92202-0427
PO BOX 428, INDIO, CA 92202-0428
PO BOX 429, INDIO, CA 92202-0429
PO BOX 430, INDIO, CA 92202-0430
PO BOX 431, INDIO, CA 92202-0431
PO BOX 432, INDIO, CA 92202-0432
PO BOX 433, INDIO, CA 92202-0433
PO BOX 434, INDIO, CA 92202-0434
PO BOX 435, INDIO, CA 92202-0435
PO BOX 436, INDIO, CA 92202-0436
PO BOX 437, INDIO, CA 92202-0437
PO BOX 438, INDIO, CA 92202-0438
PO BOX 439, INDIO, CA 92202-0439
PO BOX 440, INDIO, CA 92202-0440
PO BOX 441, INDIO, CA 92202-0441
PO BOX 442, INDIO, CA 92202-0442
PO BOX 443, INDIO, CA 92202-0443
PO BOX 444, INDIO, CA 92202-0444
PO BOX 445, INDIO, CA 92202-0445
PO BOX 446, INDIO, CA 92202-0446
PO BOX 447, INDIO, CA 92202-0447
PO BOX 448, INDIO, CA 92202-0448
PO BOX 449, INDIO, CA 92202-0449
PO BOX 450, INDIO, CA 92202-0450
PO BOX 451, INDIO, CA 92202-0451
PO BOX 452, INDIO, CA 92202-0452
PO BOX 453, INDIO, CA 92202-0453
PO BOX 454, INDIO, CA 92202-0454
PO BOX 455, INDIO, CA 92202-0455
PO BOX 456, INDIO, CA 92202-0456
PO BOX 457, INDIO, CA 92202-0457
PO BOX 458, INDIO, CA 92202-0458
PO BOX 459, INDIO, CA 92202-0459
PO BOX 460, INDIO, CA 92202-0460
PO BOX 461, INDIO, CA 92202-0461
PO BOX 462, INDIO, CA 92202-0462
PO BOX 463, INDIO, CA 92202-0463
PO BOX 464, INDIO, CA 92202-0464
PO BOX 465, INDIO, CA 92202-0465
PO BOX 466, INDIO, CA 92202-0466
PO BOX 467, INDIO, CA 92202-0467
PO BOX 468, INDIO, CA 92202-0468
PO BOX 469, INDIO, CA 92202-0469
PO BOX 470, INDIO, CA 92202-0470
PO BOX 471, INDIO, CA 92202-0471
PO BOX 472, INDIO, CA 92202-0472
PO BOX 473, INDIO, CA 92202-0473
PO BOX 474, INDIO, CA 92202-0474
PO BOX 475, INDIO, CA 92202-0475
PO BOX 476, INDIO, CA 92202-0476
PO BOX 477, INDIO, CA 92202-0477
PO BOX 478, INDIO, CA 92202-0478
PO BOX 479, INDIO, CA 92202-0479
PO BOX 480, INDIO, CA 92202-0480
PO BOX 481, INDIO, CA 92202-0481
PO BOX 482, INDIO, CA 92202-0482
PO BOX 483, INDIO, CA 92202-0483
PO BOX 484, INDIO, CA 92202-0484
PO BOX 485, INDIO, CA 92202-0485
PO BOX 486, INDIO, CA 92202-0486
PO BOX 487, INDIO, CA 92202-0487
PO BOX 488, INDIO, CA 92202-0488
PO BOX 489, INDIO, CA 92202-0489
PO BOX 490, INDIO, CA 92202-0490
PO BOX 491, INDIO, CA 92202-0491
PO BOX 492, INDIO, CA 92202-0492
PO BOX 493, INDIO, CA 92202-0493
PO BOX 494, INDIO, CA 92202-0494
PO BOX 495, INDIO, CA 92202-0495
PO BOX 496, INDIO, CA 92202-0496
PO BOX 497, INDIO, CA 92202-0497
PO BOX 498, INDIO, CA 92202-0498
PO BOX 499, INDIO, CA 92202-0499
PO BOX 500, INDIO, CA 92202-0500
PO BOX 501, INDIO, CA 92202-0501
PO BOX 502, INDIO, CA 92202-0502
PO BOX 503, INDIO, CA 92202-0503
PO BOX 504, INDIO, CA 92202-0504
PO BOX 505, INDIO, CA 92202-0505
PO BOX 506, INDIO, CA 92202-0506
PO BOX 507, INDIO, CA 92202-0507
PO BOX 508, INDIO, CA 92202-0508
PO BOX 509, INDIO, CA 92202-0509
PO BOX 510, INDIO, CA 92202-0510
PO BOX 511, INDIO, CA 92202-0511
PO BOX 512, INDIO, CA 92202-0512
PO BOX 513, INDIO, CA 92202-0513
PO BOX 514, INDIO, CA 92202-0514
PO BOX 515, INDIO, CA 92202-0515
PO BOX 516, INDIO, CA 92202-0516
PO BOX 517, INDIO, CA 92202-0517
PO BOX 518, INDIO, CA 92202-0518
PO BOX 519, INDIO, CA 92202-0519
PO BOX 520, INDIO, CA 92202-0520
PO BOX 521, INDIO, CA 92202-0521
PO BOX 522, INDIO, CA 92202-0522
PO BOX 523, INDIO, CA 92202-0523
PO BOX 524, INDIO, CA 92202-0524
PO BOX 525, INDIO, CA 92202-0525
PO BOX 526, INDIO, CA 92202-0526
PO BOX 527, INDIO, CA 92202-0527
PO BOX 528, INDIO, CA 92202-0528
PO BOX 529, INDIO, CA 92202-0529
PO BOX 530, INDIO, CA 92202-0530
PO BOX 531, INDIO, CA 92202-0531
PO BOX 532, INDIO, CA 92202-0532
PO BOX 533, INDIO, CA 92202-0533
PO BOX 534, INDIO, CA 92202-0534
PO BOX 535, INDIO, CA 92202-0535
PO BOX 536, INDIO, CA 92202-0536
PO BOX 537, INDIO, CA 92202-0537
PO BOX 538, INDIO, CA 92202-0538
PO BOX 539, INDIO, CA 92202-0539
PO BOX 540, INDIO, CA 92202-0540
PO BOX 541, INDIO, CA 92202-0541
PO BOX 542, INDIO, CA 92202-0542
PO BOX 543, INDIO, CA 92202-0543
PO BOX 544, INDIO, CA 92202-0544
PO BOX 545, INDIO, CA 92202-0545
PO BOX 546, INDIO, CA 92202-0546
PO BOX 547, INDIO, CA 92202-0547
PO BOX 548, INDIO, CA 92202-0548
PO BOX 549, INDIO, CA 92202-0549
PO BOX 550, INDIO, CA 92202-0550
PO BOX 551, INDIO, CA 92202-0551
PO BOX 552, INDIO, CA 92202-0552
PO BOX 553, INDIO, CA 92202-0553
PO BOX 554, INDIO, CA 92202-0554
PO BOX 555, INDIO, CA 92202-0555
PO BOX 556, INDIO, CA 92202-0556
PO BOX 557, INDIO, CA 92202-0557
PO BOX 558, INDIO, CA 92202-0558
PO BOX 559, INDIO, CA 92202-0559
PO BOX 560, INDIO, CA 92202-0560
PO BOX 561, INDIO, CA 92202-0561
PO BOX 562, INDIO, CA 92202-0562
PO BOX 563, INDIO, CA 92202-0563
PO BOX 564, INDIO, CA 92202-0564
PO BOX 565, INDIO, CA 92202-0565
PO BOX 566, INDIO, CA 92202-0566
PO BOX 567, INDIO, CA 92202-0567
PO BOX 568, INDIO, CA 92202-0568
PO BOX 569, INDIO, CA 92202-0569
PO BOX 570, INDIO, CA 92202-0570
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