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 321, GLENDALE, CA 91209-0321
PO BOX 322, GLENDALE, CA 91209-0322
PO BOX 323, GLENDALE, CA 91209-0323
PO BOX 324, GLENDALE, CA 91209-0324
PO BOX 325, GLENDALE, CA 91209-0325
PO BOX 326, GLENDALE, CA 91209-0326
PO BOX 327, GLENDALE, CA 91209-0327
PO BOX 328, GLENDALE, CA 91209-0328
PO BOX 329, GLENDALE, CA 91209-0329
PO BOX 330, GLENDALE, CA 91209-0330
PO BOX 331, GLENDALE, CA 91209-0331
PO BOX 332, GLENDALE, CA 91209-0332
PO BOX 333, GLENDALE, CA 91209-0333
PO BOX 334, GLENDALE, CA 91209-0334
PO BOX 335, GLENDALE, CA 91209-0335
PO BOX 336, GLENDALE, CA 91209-0336
PO BOX 337, GLENDALE, CA 91209-0337
PO BOX 338, GLENDALE, CA 91209-0338
PO BOX 339, GLENDALE, CA 91209-0339
PO BOX 340, GLENDALE, CA 91209-0340
PO BOX 341, GLENDALE, CA 91209-0341
PO BOX 342, GLENDALE, CA 91209-0342
PO BOX 343, GLENDALE, CA 91209-0343
PO BOX 344, GLENDALE, CA 91209-0344
PO BOX 345, GLENDALE, CA 91209-0345
PO BOX 346, GLENDALE, CA 91209-0346
PO BOX 347, GLENDALE, CA 91209-0347
PO BOX 348, GLENDALE, CA 91209-0348
PO BOX 349, GLENDALE, CA 91209-0349
PO BOX 350, GLENDALE, CA 91209-0350
PO BOX 351, GLENDALE, CA 91209-0351
PO BOX 352, GLENDALE, CA 91209-0352
PO BOX 353, GLENDALE, CA 91209-0353
PO BOX 354, GLENDALE, CA 91209-0354
PO BOX 355, GLENDALE, CA 91209-0355
PO BOX 356, GLENDALE, CA 91209-0356
PO BOX 357, GLENDALE, CA 91209-0357
PO BOX 358, GLENDALE, CA 91209-0358
PO BOX 359, GLENDALE, CA 91209-0359
PO BOX 360, GLENDALE, CA 91209-0360
PO BOX 361, GLENDALE, CA 91209-0361
PO BOX 362, GLENDALE, CA 91209-0362
PO BOX 363, GLENDALE, CA 91209-0363
PO BOX 364, GLENDALE, CA 91209-0364
PO BOX 365, GLENDALE, CA 91209-0365
PO BOX 366, GLENDALE, CA 91209-0366
PO BOX 367, GLENDALE, CA 91209-0367
PO BOX 368, GLENDALE, CA 91209-0368
PO BOX 369, GLENDALE, CA 91209-0369
PO BOX 370, GLENDALE, CA 91209-0370
PO BOX 371, GLENDALE, CA 91209-0371
PO BOX 372, GLENDALE, CA 91209-0372
PO BOX 373, GLENDALE, CA 91209-0373
PO BOX 374, GLENDALE, CA 91209-0374
PO BOX 375, GLENDALE, CA 91209-0375
PO BOX 376, GLENDALE, CA 91209-0376
PO BOX 377, GLENDALE, CA 91209-0377
PO BOX 378, GLENDALE, CA 91209-0378
PO BOX 379, GLENDALE, CA 91209-0379
PO BOX 380, GLENDALE, CA 91209-0380
PO BOX 381, GLENDALE, CA 91209-0381
PO BOX 382, GLENDALE, CA 91209-0382
PO BOX 383, GLENDALE, CA 91209-0383
PO BOX 384, GLENDALE, CA 91209-0384
PO BOX 385, GLENDALE, CA 91209-0385
PO BOX 386, GLENDALE, CA 91209-0386
PO BOX 387, GLENDALE, CA 91209-0387
PO BOX 388, GLENDALE, CA 91209-0388
PO BOX 389, GLENDALE, CA 91209-0389
PO BOX 390, GLENDALE, CA 91209-0390
PO BOX 391, GLENDALE, CA 91209-0391
PO BOX 392, GLENDALE, CA 91209-0392
PO BOX 393, GLENDALE, CA 91209-0393
PO BOX 394, GLENDALE, CA 91209-0394
PO BOX 395, GLENDALE, CA 91209-0395
PO BOX 396, GLENDALE, CA 91209-0396
PO BOX 397, GLENDALE, CA 91209-0397
PO BOX 398, GLENDALE, CA 91209-0398
PO BOX 399, GLENDALE, CA 91209-0399
PO BOX 400, GLENDALE, CA 91209-0400
PO BOX 401, GLENDALE, CA 91209-0401
PO BOX 402, GLENDALE, CA 91209-0402
PO BOX 403, GLENDALE, CA 91209-0403
PO BOX 404, GLENDALE, CA 91209-0404
PO BOX 405, GLENDALE, CA 91209-0405
PO BOX 406, GLENDALE, CA 91209-0406
PO BOX 407, GLENDALE, CA 91209-0407
PO BOX 408, GLENDALE, CA 91209-0408
PO BOX 409, GLENDALE, CA 91209-0409
PO BOX 410, GLENDALE, CA 91209-0410
PO BOX 411, GLENDALE, CA 91209-0411
PO BOX 412, GLENDALE, CA 91209-0412
PO BOX 413, GLENDALE, CA 91209-0413
PO BOX 414, GLENDALE, CA 91209-0414
PO BOX 415, GLENDALE, CA 91209-0415
PO BOX 416, GLENDALE, CA 91209-0416
PO BOX 417, GLENDALE, CA 91209-0417
PO BOX 418, GLENDALE, CA 91209-0418
PO BOX 419, GLENDALE, CA 91209-0419
PO BOX 420, GLENDALE, CA 91209-0420
PO BOX 421, GLENDALE, CA 91209-0421
PO BOX 422, GLENDALE, CA 91209-0422
PO BOX 423, GLENDALE, CA 91209-0423
PO BOX 424, GLENDALE, CA 91209-0424
PO BOX 425, GLENDALE, CA 91209-0425
PO BOX 426, GLENDALE, CA 91209-0426
PO BOX 427, GLENDALE, CA 91209-0427
PO BOX 428, GLENDALE, CA 91209-0428
PO BOX 429, GLENDALE, CA 91209-0429
PO BOX 430, GLENDALE, CA 91209-0430
PO BOX 431, GLENDALE, CA 91209-0431
PO BOX 432, GLENDALE, CA 91209-0432
PO BOX 433, GLENDALE, CA 91209-0433
PO BOX 434, GLENDALE, CA 91209-0434
PO BOX 435, GLENDALE, CA 91209-0435
PO BOX 436, GLENDALE, CA 91209-0436
PO BOX 437, GLENDALE, CA 91209-0437
PO BOX 438, GLENDALE, CA 91209-0438
PO BOX 439, GLENDALE, CA 91209-0439
PO BOX 440, GLENDALE, CA 91209-0440
PO BOX 441, GLENDALE, CA 91209-0441
PO BOX 442, GLENDALE, CA 91209-0442
PO BOX 443, GLENDALE, CA 91209-0443
PO BOX 444, GLENDALE, CA 91209-0444
PO BOX 445, GLENDALE, CA 91209-0445
PO BOX 446, GLENDALE, CA 91209-0446
PO BOX 447, GLENDALE, CA 91209-0447
PO BOX 448, GLENDALE, CA 91209-0448
PO BOX 449, GLENDALE, CA 91209-0449
PO BOX 450, GLENDALE, CA 91209-0450
PO BOX 451, GLENDALE, CA 91209-0451
PO BOX 452, GLENDALE, CA 91209-0452
PO BOX 453, GLENDALE, CA 91209-0453
PO BOX 454, GLENDALE, CA 91209-0454
PO BOX 455, GLENDALE, CA 91209-0455
PO BOX 456, GLENDALE, CA 91209-0456
PO BOX 457, GLENDALE, CA 91209-0457
PO BOX 458, GLENDALE, CA 91209-0458
PO BOX 459, GLENDALE, CA 91209-0459
PO BOX 460, GLENDALE, CA 91209-0460
PO BOX 461, GLENDALE, CA 91209-0461
PO BOX 462, GLENDALE, CA 91209-0462
PO BOX 463, GLENDALE, CA 91209-0463
PO BOX 464, GLENDALE, CA 91209-0464
PO BOX 465, GLENDALE, CA 91209-0465
PO BOX 466, GLENDALE, CA 91209-0466
PO BOX 467, GLENDALE, CA 91209-0467
PO BOX 468, GLENDALE, CA 91209-0468
PO BOX 469, GLENDALE, CA 91209-0469
PO BOX 470, GLENDALE, CA 91209-0470
PO BOX 471, GLENDALE, CA 91209-0471
PO BOX 472, GLENDALE, CA 91209-0472
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