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 300, LA CANADA FLINTRIDGE, CA 91012-0300
PO BOX 301, LA CANADA FLINTRIDGE, CA 91012-0301
PO BOX 302, LA CANADA FLINTRIDGE, CA 91012-0302
PO BOX 303, LA CANADA FLINTRIDGE, CA 91012-0303
PO BOX 304, LA CANADA FLINTRIDGE, CA 91012-0304
PO BOX 305, LA CANADA FLINTRIDGE, CA 91012-0305
PO BOX 306, LA CANADA FLINTRIDGE, CA 91012-0306
PO BOX 307, LA CANADA FLINTRIDGE, CA 91012-0307
PO BOX 308, LA CANADA FLINTRIDGE, CA 91012-0308
PO BOX 309, LA CANADA FLINTRIDGE, CA 91012-0309
PO BOX 310, LA CANADA FLINTRIDGE, CA 91012-0310
PO BOX 311, LA CANADA FLINTRIDGE, CA 91012-0311
PO BOX 312, LA CANADA FLINTRIDGE, CA 91012-0312
PO BOX 313, LA CANADA FLINTRIDGE, CA 91012-0313
PO BOX 314, LA CANADA FLINTRIDGE, CA 91012-0314
PO BOX 315, LA CANADA FLINTRIDGE, CA 91012-0315
PO BOX 316, LA CANADA FLINTRIDGE, CA 91012-0316
PO BOX 317, LA CANADA FLINTRIDGE, CA 91012-0317
PO BOX 318, LA CANADA FLINTRIDGE, CA 91012-0318
PO BOX 319, LA CANADA FLINTRIDGE, CA 91012-0319
PO BOX 320, LA CANADA FLINTRIDGE, CA 91012-0320
PO BOX 321, LA CANADA FLINTRIDGE, CA 91012-0321
PO BOX 322, LA CANADA FLINTRIDGE, CA 91012-0322
PO BOX 323, LA CANADA FLINTRIDGE, CA 91012-0323
PO BOX 324, LA CANADA FLINTRIDGE, CA 91012-0324
PO BOX 325, LA CANADA FLINTRIDGE, CA 91012-0325
PO BOX 326, LA CANADA FLINTRIDGE, CA 91012-0326
PO BOX 327, LA CANADA FLINTRIDGE, CA 91012-0327
PO BOX 328, LA CANADA FLINTRIDGE, CA 91012-0328
PO BOX 329, LA CANADA FLINTRIDGE, CA 91012-0329
PO BOX 330, LA CANADA FLINTRIDGE, CA 91012-0330
PO BOX 331, LA CANADA FLINTRIDGE, CA 91012-0331
PO BOX 332, LA CANADA FLINTRIDGE, CA 91012-0332
PO BOX 333, LA CANADA FLINTRIDGE, CA 91012-0333
PO BOX 334, LA CANADA FLINTRIDGE, CA 91012-0334
PO BOX 335, LA CANADA FLINTRIDGE, CA 91012-0335
PO BOX 336, LA CANADA FLINTRIDGE, CA 91012-0336
PO BOX 337, LA CANADA FLINTRIDGE, CA 91012-0337
PO BOX 338, LA CANADA FLINTRIDGE, CA 91012-0338
PO BOX 339, LA CANADA FLINTRIDGE, CA 91012-0339
PO BOX 340, LA CANADA FLINTRIDGE, CA 91012-0340
PO BOX 341, LA CANADA FLINTRIDGE, CA 91012-0341
PO BOX 342, LA CANADA FLINTRIDGE, CA 91012-0342
PO BOX 343, LA CANADA FLINTRIDGE, CA 91012-0343
PO BOX 344, LA CANADA FLINTRIDGE, CA 91012-0344
PO BOX 345, LA CANADA FLINTRIDGE, CA 91012-0345
PO BOX 346, LA CANADA FLINTRIDGE, CA 91012-0346
PO BOX 347, LA CANADA FLINTRIDGE, CA 91012-0347
PO BOX 348, LA CANADA FLINTRIDGE, CA 91012-0348
PO BOX 349, LA CANADA FLINTRIDGE, CA 91012-0349
PO BOX 350, LA CANADA FLINTRIDGE, CA 91012-0350
PO BOX 351, LA CANADA FLINTRIDGE, CA 91012-0351
PO BOX 352, LA CANADA FLINTRIDGE, CA 91012-0352
PO BOX 353, LA CANADA FLINTRIDGE, CA 91012-0353
PO BOX 354, LA CANADA FLINTRIDGE, CA 91012-0354
PO BOX 355, LA CANADA FLINTRIDGE, CA 91012-0355
PO BOX 356, LA CANADA FLINTRIDGE, CA 91012-0356
PO BOX 357, LA CANADA FLINTRIDGE, CA 91012-0357
PO BOX 358, LA CANADA FLINTRIDGE, CA 91012-0358
PO BOX 359, LA CANADA FLINTRIDGE, CA 91012-0359
PO BOX 360, LA CANADA FLINTRIDGE, CA 91012-0360
PO BOX 361, LA CANADA FLINTRIDGE, CA 91012-0361
PO BOX 362, LA CANADA FLINTRIDGE, CA 91012-0362
PO BOX 363, LA CANADA FLINTRIDGE, CA 91012-0363
PO BOX 364, LA CANADA FLINTRIDGE, CA 91012-0364
PO BOX 365, LA CANADA FLINTRIDGE, CA 91012-0365
PO BOX 366, LA CANADA FLINTRIDGE, CA 91012-0366
PO BOX 367, LA CANADA FLINTRIDGE, CA 91012-0367
PO BOX 368, LA CANADA FLINTRIDGE, CA 91012-0368
PO BOX 369, LA CANADA FLINTRIDGE, CA 91012-0369
PO BOX 370, LA CANADA FLINTRIDGE, CA 91012-0370
PO BOX 371, LA CANADA FLINTRIDGE, CA 91012-0371
PO BOX 372, LA CANADA FLINTRIDGE, CA 91012-0372
PO BOX 373, LA CANADA FLINTRIDGE, CA 91012-0373
PO BOX 374, LA CANADA FLINTRIDGE, CA 91012-0374
PO BOX 375, LA CANADA FLINTRIDGE, CA 91012-0375
PO BOX 376, LA CANADA FLINTRIDGE, CA 91012-0376
PO BOX 377, LA CANADA FLINTRIDGE, CA 91012-0377
PO BOX 378, LA CANADA FLINTRIDGE, CA 91012-0378
PO BOX 379, LA CANADA FLINTRIDGE, CA 91012-0379
PO BOX 380, LA CANADA FLINTRIDGE, CA 91012-0380
PO BOX 381, LA CANADA FLINTRIDGE, CA 91012-0381
PO BOX 382, LA CANADA FLINTRIDGE, CA 91012-0382
PO BOX 383, LA CANADA FLINTRIDGE, CA 91012-0383
PO BOX 384, LA CANADA FLINTRIDGE, CA 91012-0384
PO BOX 385, LA CANADA FLINTRIDGE, CA 91012-0385
PO BOX 386, LA CANADA FLINTRIDGE, CA 91012-0386
PO BOX 387, LA CANADA FLINTRIDGE, CA 91012-0387
PO BOX 388, LA CANADA FLINTRIDGE, CA 91012-0388
PO BOX 389, LA CANADA FLINTRIDGE, CA 91012-0389
PO BOX 390, LA CANADA FLINTRIDGE, CA 91012-0390
PO BOX 391, LA CANADA FLINTRIDGE, CA 91012-0391
PO BOX 392, LA CANADA FLINTRIDGE, CA 91012-0392
PO BOX 393, LA CANADA FLINTRIDGE, CA 91012-0393
PO BOX 394, LA CANADA FLINTRIDGE, CA 91012-0394
PO BOX 395, LA CANADA FLINTRIDGE, CA 91012-0395
PO BOX 396, LA CANADA FLINTRIDGE, CA 91012-0396
PO BOX 397, LA CANADA FLINTRIDGE, CA 91012-0397
PO BOX 398, LA CANADA FLINTRIDGE, CA 91012-0398
PO BOX 399, LA CANADA FLINTRIDGE, CA 91012-0399
PO BOX 400, LA CANADA FLINTRIDGE, CA 91012-0400
PO BOX 401, LA CANADA FLINTRIDGE, CA 91012-0401
PO BOX 402, LA CANADA FLINTRIDGE, CA 91012-0402
PO BOX 403, LA CANADA FLINTRIDGE, CA 91012-0403
PO BOX 404, LA CANADA FLINTRIDGE, CA 91012-0404
PO BOX 405, LA CANADA FLINTRIDGE, CA 91012-0405
PO BOX 406, LA CANADA FLINTRIDGE, CA 91012-0406
PO BOX 407, LA CANADA FLINTRIDGE, CA 91012-0407
PO BOX 408, LA CANADA FLINTRIDGE, CA 91012-0408
PO BOX 409, LA CANADA FLINTRIDGE, CA 91012-0409
PO BOX 410, LA CANADA FLINTRIDGE, CA 91012-0410
PO BOX 411, LA CANADA FLINTRIDGE, CA 91012-0411
PO BOX 412, LA CANADA FLINTRIDGE, CA 91012-0412
PO BOX 413, LA CANADA FLINTRIDGE, CA 91012-0413
PO BOX 414, LA CANADA FLINTRIDGE, CA 91012-0414
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