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 281, PORTERVILLE, CA 93258-0281
PO BOX 282, PORTERVILLE, CA 93258-0282
PO BOX 283, PORTERVILLE, CA 93258-0283
PO BOX 284, PORTERVILLE, CA 93258-0284
PO BOX 285, PORTERVILLE, CA 93258-0285
PO BOX 286, PORTERVILLE, CA 93258-0286
PO BOX 287, PORTERVILLE, CA 93258-0287
PO BOX 288, PORTERVILLE, CA 93258-0288
PO BOX 289, PORTERVILLE, CA 93258-0289
PO BOX 290, PORTERVILLE, CA 93258-0290
PO BOX 291, PORTERVILLE, CA 93258-0291
PO BOX 292, PORTERVILLE, CA 93258-0292
PO BOX 293, PORTERVILLE, CA 93258-0293
PO BOX 294, PORTERVILLE, CA 93258-0294
PO BOX 295, PORTERVILLE, CA 93258-0295
PO BOX 296, PORTERVILLE, CA 93258-0296
PO BOX 297, PORTERVILLE, CA 93258-0297
PO BOX 298, PORTERVILLE, CA 93258-0298
PO BOX 299, PORTERVILLE, CA 93258-0299
PO BOX 300, PORTERVILLE, CA 93258-0300
PO BOX 301, PORTERVILLE, CA 93258-0301
PO BOX 302, PORTERVILLE, CA 93258-0302
PO BOX 303, PORTERVILLE, CA 93258-0303
PO BOX 304, PORTERVILLE, CA 93258-0304
PO BOX 305, PORTERVILLE, CA 93258-0305
PO BOX 306, PORTERVILLE, CA 93258-0306
PO BOX 307, PORTERVILLE, CA 93258-0307
PO BOX 308, PORTERVILLE, CA 93258-0308
PO BOX 309, PORTERVILLE, CA 93258-0309
PO BOX 310, PORTERVILLE, CA 93258-0310
PO BOX 311, PORTERVILLE, CA 93258-0311
PO BOX 312, PORTERVILLE, CA 93258-0312
PO BOX 313, PORTERVILLE, CA 93258-0313
PO BOX 314, PORTERVILLE, CA 93258-0314
PO BOX 315, PORTERVILLE, CA 93258-0315
PO BOX 316, PORTERVILLE, CA 93258-0316
PO BOX 317, PORTERVILLE, CA 93258-0317
PO BOX 318, PORTERVILLE, CA 93258-0318
PO BOX 319, PORTERVILLE, CA 93258-0319
PO BOX 320, PORTERVILLE, CA 93258-0320
PO BOX 321, PORTERVILLE, CA 93258-0321
PO BOX 322, PORTERVILLE, CA 93258-0322
PO BOX 323, PORTERVILLE, CA 93258-0323
PO BOX 324, PORTERVILLE, CA 93258-0324
PO BOX 325, PORTERVILLE, CA 93258-0325
PO BOX 326, PORTERVILLE, CA 93258-0326
PO BOX 327, PORTERVILLE, CA 93258-0327
PO BOX 328, PORTERVILLE, CA 93258-0328
PO BOX 329, PORTERVILLE, CA 93258-0329
PO BOX 330, PORTERVILLE, CA 93258-0330
PO BOX 331, PORTERVILLE, CA 93258-0331
PO BOX 332, PORTERVILLE, CA 93258-0332
PO BOX 333, PORTERVILLE, CA 93258-0333
PO BOX 334, PORTERVILLE, CA 93258-0334
PO BOX 335, PORTERVILLE, CA 93258-0335
PO BOX 336, PORTERVILLE, CA 93258-0336
PO BOX 337, PORTERVILLE, CA 93258-0337
PO BOX 338, PORTERVILLE, CA 93258-0338
PO BOX 339, PORTERVILLE, CA 93258-0339
PO BOX 340, PORTERVILLE, CA 93258-0340
PO BOX 341, PORTERVILLE, CA 93258-0341
PO BOX 342, PORTERVILLE, CA 93258-0342
PO BOX 343, PORTERVILLE, CA 93258-0343
PO BOX 344, PORTERVILLE, CA 93258-0344
PO BOX 345, PORTERVILLE, CA 93258-0345
PO BOX 346, PORTERVILLE, CA 93258-0346
PO BOX 347, PORTERVILLE, CA 93258-0347
PO BOX 348, PORTERVILLE, CA 93258-0348
PO BOX 349, PORTERVILLE, CA 93258-0349
PO BOX 350, PORTERVILLE, CA 93258-0350
PO BOX 351, PORTERVILLE, CA 93258-0351
PO BOX 352, PORTERVILLE, CA 93258-0352
PO BOX 353, PORTERVILLE, CA 93258-0353
PO BOX 354, PORTERVILLE, CA 93258-0354
PO BOX 355, PORTERVILLE, CA 93258-0355
PO BOX 356, PORTERVILLE, CA 93258-0356
PO BOX 357, PORTERVILLE, CA 93258-0357
PO BOX 358, PORTERVILLE, CA 93258-0358
PO BOX 359, PORTERVILLE, CA 93258-0359
PO BOX 360, PORTERVILLE, CA 93258-0360
PO BOX 361, PORTERVILLE, CA 93258-0361
PO BOX 362, PORTERVILLE, CA 93258-0362
PO BOX 363, PORTERVILLE, CA 93258-0363
PO BOX 364, PORTERVILLE, CA 93258-0364
PO BOX 365, PORTERVILLE, CA 93258-0365
PO BOX 366, PORTERVILLE, CA 93258-0366
PO BOX 367, PORTERVILLE, CA 93258-0367
PO BOX 368, PORTERVILLE, CA 93258-0368
PO BOX 369, PORTERVILLE, CA 93258-0369
PO BOX 370, PORTERVILLE, CA 93258-0370
PO BOX 371, PORTERVILLE, CA 93258-0371
PO BOX 372, PORTERVILLE, CA 93258-0372
PO BOX 373, PORTERVILLE, CA 93258-0373
PO BOX 374, PORTERVILLE, CA 93258-0374
PO BOX 375, PORTERVILLE, CA 93258-0375
PO BOX 376, PORTERVILLE, CA 93258-0376
PO BOX 377, PORTERVILLE, CA 93258-0377
PO BOX 378, PORTERVILLE, CA 93258-0378
PO BOX 379, PORTERVILLE, CA 93258-0379
PO BOX 380, PORTERVILLE, CA 93258-0380
PO BOX 381, PORTERVILLE, CA 93258-0381
PO BOX 382, PORTERVILLE, CA 93258-0382
PO BOX 383, PORTERVILLE, CA 93258-0383
PO BOX 384, PORTERVILLE, CA 93258-0384
PO BOX 385, PORTERVILLE, CA 93258-0385
PO BOX 386, PORTERVILLE, CA 93258-0386
PO BOX 387, PORTERVILLE, CA 93258-0387
PO BOX 388, PORTERVILLE, CA 93258-0388
PO BOX 389, PORTERVILLE, CA 93258-0389
PO BOX 390, PORTERVILLE, CA 93258-0390
PO BOX 391, PORTERVILLE, CA 93258-0391
PO BOX 392, PORTERVILLE, CA 93258-0392
PO BOX 393, PORTERVILLE, CA 93258-0393
PO BOX 394, PORTERVILLE, CA 93258-0394
PO BOX 395, PORTERVILLE, CA 93258-0395
PO BOX 396, PORTERVILLE, CA 93258-0396
PO BOX 397, PORTERVILLE, CA 93258-0397
PO BOX 398, PORTERVILLE, CA 93258-0398
PO BOX 399, PORTERVILLE, CA 93258-0399
PO BOX 400, PORTERVILLE, CA 93258-0400
PO BOX 401, PORTERVILLE, CA 93258-0401
PO BOX 402, PORTERVILLE, CA 93258-0402
PO BOX 403, PORTERVILLE, CA 93258-0403
PO BOX 404, PORTERVILLE, CA 93258-0404
PO BOX 405, PORTERVILLE, CA 93258-0405
PO BOX 406, PORTERVILLE, CA 93258-0406
PO BOX 407, PORTERVILLE, CA 93258-0407
PO BOX 408, PORTERVILLE, CA 93258-0408
PO BOX 409, PORTERVILLE, CA 93258-0409
PO BOX 410, PORTERVILLE, CA 93258-0410
PO BOX 411, PORTERVILLE, CA 93258-0411
PO BOX 412, PORTERVILLE, CA 93258-0412
PO BOX 413, PORTERVILLE, CA 93258-0413
PO BOX 414, PORTERVILLE, CA 93258-0414
PO BOX 415, PORTERVILLE, CA 93258-0415
PO BOX 416, PORTERVILLE, CA 93258-0416
PO BOX 417, PORTERVILLE, CA 93258-0417
PO BOX 418, PORTERVILLE, CA 93258-0418
PO BOX 419, PORTERVILLE, CA 93258-0419
PO BOX 420, PORTERVILLE, CA 93258-0420
PO BOX 421, PORTERVILLE, CA 93258-0421
PO BOX 422, PORTERVILLE, CA 93258-0422
PO BOX 423, PORTERVILLE, CA 93258-0423
PO BOX 424, PORTERVILLE, CA 93258-0424
PO BOX 425, PORTERVILLE, CA 93258-0425
PO BOX 426, PORTERVILLE, CA 93258-0426
PO BOX 427, PORTERVILLE, CA 93258-0427
PO BOX 428, PORTERVILLE, CA 93258-0428
PO BOX 429, PORTERVILLE, CA 93258-0429
PO BOX 430, PORTERVILLE, CA 93258-0430
PO BOX 431, PORTERVILLE, CA 93258-0431
PO BOX 432, PORTERVILLE, CA 93258-0432
PO BOX 433, PORTERVILLE, CA 93258-0433
PO BOX 434, PORTERVILLE, CA 93258-0434
PO BOX 435, PORTERVILLE, CA 93258-0435
PO BOX 436, PORTERVILLE, CA 93258-0436
PO BOX 437, PORTERVILLE, CA 93258-0437
PO BOX 438, PORTERVILLE, CA 93258-0438
PO BOX 439, PORTERVILLE, CA 93258-0439
PO BOX 440, PORTERVILLE, CA 93258-0440
PO BOX 441, PORTERVILLE, CA 93258-0441
PO BOX 442, PORTERVILLE, CA 93258-0442
PO BOX 443, PORTERVILLE, CA 93258-0443
PO BOX 444, PORTERVILLE, CA 93258-0444
PO BOX 445, PORTERVILLE, CA 93258-0445
PO BOX 446, PORTERVILLE, CA 93258-0446
PO BOX 447, PORTERVILLE, CA 93258-0447
PO BOX 448, PORTERVILLE, CA 93258-0448
PO BOX 449, PORTERVILLE, CA 93258-0449
PO BOX 450, PORTERVILLE, CA 93258-0450
PO BOX 451, PORTERVILLE, CA 93258-0451
PO BOX 452, PORTERVILLE, CA 93258-0452
PO BOX 453, PORTERVILLE, CA 93258-0453
PO BOX 454, PORTERVILLE, CA 93258-0454
PO BOX 455, PORTERVILLE, CA 93258-0455
PO BOX 456, PORTERVILLE, CA 93258-0456
PO BOX 457, PORTERVILLE, CA 93258-0457
PO BOX 458, PORTERVILLE, CA 93258-0458
PO BOX 459, PORTERVILLE, CA 93258-0459
PO BOX 460, PORTERVILLE, CA 93258-0460
PO BOX 461, PORTERVILLE, CA 93258-0461
PO BOX 462, PORTERVILLE, CA 93258-0462
PO BOX 463, PORTERVILLE, CA 93258-0463
PO BOX 464, PORTERVILLE, CA 93258-0464
PO BOX 465, PORTERVILLE, CA 93258-0465
PO BOX 466, PORTERVILLE, CA 93258-0466
PO BOX 467, PORTERVILLE, CA 93258-0467
PO BOX 468, PORTERVILLE, CA 93258-0468
PO BOX 469, PORTERVILLE, CA 93258-0469
PO BOX 470, PORTERVILLE, CA 93258-0470
PO BOX 471, PORTERVILLE, CA 93258-0471
PO BOX 472, PORTERVILLE, CA 93258-0472
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