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 261, SAN LUIS OBISPO, CA 93406-0261
PO BOX 262, SAN LUIS OBISPO, CA 93406-0262
PO BOX 263, SAN LUIS OBISPO, CA 93406-0263
PO BOX 264, SAN LUIS OBISPO, CA 93406-0264
PO BOX 265, SAN LUIS OBISPO, CA 93406-0265
PO BOX 266, SAN LUIS OBISPO, CA 93406-0266
PO BOX 267, SAN LUIS OBISPO, CA 93406-0267
PO BOX 268, SAN LUIS OBISPO, CA 93406-0268
PO BOX 269, SAN LUIS OBISPO, CA 93406-0269
PO BOX 270, SAN LUIS OBISPO, CA 93406-0270
PO BOX 271, SAN LUIS OBISPO, CA 93406-0271
PO BOX 272, SAN LUIS OBISPO, CA 93406-0272
PO BOX 273, SAN LUIS OBISPO, CA 93406-0273
PO BOX 274, SAN LUIS OBISPO, CA 93406-0274
PO BOX 275, SAN LUIS OBISPO, CA 93406-0275
PO BOX 276, SAN LUIS OBISPO, CA 93406-0276
PO BOX 277, SAN LUIS OBISPO, CA 93406-0277
PO BOX 278, SAN LUIS OBISPO, CA 93406-0278
PO BOX 279, SAN LUIS OBISPO, CA 93406-0279
PO BOX 280, SAN LUIS OBISPO, CA 93406-0280
PO BOX 281, SAN LUIS OBISPO, CA 93406-0281
PO BOX 282, SAN LUIS OBISPO, CA 93406-0282
PO BOX 283, SAN LUIS OBISPO, CA 93406-0283
PO BOX 284, SAN LUIS OBISPO, CA 93406-0284
PO BOX 285, SAN LUIS OBISPO, CA 93406-0285
PO BOX 286, SAN LUIS OBISPO, CA 93406-0286
PO BOX 287, SAN LUIS OBISPO, CA 93406-0287
PO BOX 288, SAN LUIS OBISPO, CA 93406-0288
PO BOX 289, SAN LUIS OBISPO, CA 93406-0289
PO BOX 290, SAN LUIS OBISPO, CA 93406-0290
PO BOX 291, SAN LUIS OBISPO, CA 93406-0291
PO BOX 292, SAN LUIS OBISPO, CA 93406-0292
PO BOX 293, SAN LUIS OBISPO, CA 93406-0293
PO BOX 294, SAN LUIS OBISPO, CA 93406-0294
PO BOX 295, SAN LUIS OBISPO, CA 93406-0295
PO BOX 296, SAN LUIS OBISPO, CA 93406-0296
PO BOX 297, SAN LUIS OBISPO, CA 93406-0297
PO BOX 298, SAN LUIS OBISPO, CA 93406-0298
PO BOX 299, SAN LUIS OBISPO, CA 93406-0299
PO BOX 300, SAN LUIS OBISPO, CA 93406-0300
PO BOX 301, SAN LUIS OBISPO, CA 93406-0301
PO BOX 302, SAN LUIS OBISPO, CA 93406-0302
PO BOX 303, SAN LUIS OBISPO, CA 93406-0303
PO BOX 304, SAN LUIS OBISPO, CA 93406-0304
PO BOX 305, SAN LUIS OBISPO, CA 93406-0305
PO BOX 306, SAN LUIS OBISPO, CA 93406-0306
PO BOX 307, SAN LUIS OBISPO, CA 93406-0307
PO BOX 308, SAN LUIS OBISPO, CA 93406-0308
PO BOX 309, SAN LUIS OBISPO, CA 93406-0309
PO BOX 310, SAN LUIS OBISPO, CA 93406-0310
PO BOX 311, SAN LUIS OBISPO, CA 93406-0311
PO BOX 312, SAN LUIS OBISPO, CA 93406-0312
PO BOX 313, SAN LUIS OBISPO, CA 93406-0313
PO BOX 314, SAN LUIS OBISPO, CA 93406-0314
PO BOX 315, SAN LUIS OBISPO, CA 93406-0315
PO BOX 316, SAN LUIS OBISPO, CA 93406-0316
PO BOX 317, SAN LUIS OBISPO, CA 93406-0317
PO BOX 318, SAN LUIS OBISPO, CA 93406-0318
PO BOX 319, SAN LUIS OBISPO, CA 93406-0319
PO BOX 320, SAN LUIS OBISPO, CA 93406-0320
PO BOX 321, SAN LUIS OBISPO, CA 93406-0321
PO BOX 322, SAN LUIS OBISPO, CA 93406-0322
PO BOX 323, SAN LUIS OBISPO, CA 93406-0323
PO BOX 324, SAN LUIS OBISPO, CA 93406-0324
PO BOX 325, SAN LUIS OBISPO, CA 93406-0325
PO BOX 326, SAN LUIS OBISPO, CA 93406-0326
PO BOX 327, SAN LUIS OBISPO, CA 93406-0327
PO BOX 328, SAN LUIS OBISPO, CA 93406-0328
PO BOX 329, SAN LUIS OBISPO, CA 93406-0329
PO BOX 330, SAN LUIS OBISPO, CA 93406-0330
PO BOX 331, SAN LUIS OBISPO, CA 93406-0331
PO BOX 332, SAN LUIS OBISPO, CA 93406-0332
PO BOX 333, SAN LUIS OBISPO, CA 93406-0333
PO BOX 334, SAN LUIS OBISPO, CA 93406-0334
PO BOX 335, SAN LUIS OBISPO, CA 93406-0335
PO BOX 336, SAN LUIS OBISPO, CA 93406-0336
PO BOX 337, SAN LUIS OBISPO, CA 93406-0337
PO BOX 338, SAN LUIS OBISPO, CA 93406-0338
PO BOX 339, SAN LUIS OBISPO, CA 93406-0339
PO BOX 340, SAN LUIS OBISPO, CA 93406-0340
PO BOX 341, SAN LUIS OBISPO, CA 93406-0341
PO BOX 342, SAN LUIS OBISPO, CA 93406-0342
PO BOX 343, SAN LUIS OBISPO, CA 93406-0343
PO BOX 344, SAN LUIS OBISPO, CA 93406-0344
PO BOX 345, SAN LUIS OBISPO, CA 93406-0345
PO BOX 346, SAN LUIS OBISPO, CA 93406-0346
PO BOX 347, SAN LUIS OBISPO, CA 93406-0347
PO BOX 348, SAN LUIS OBISPO, CA 93406-0348
PO BOX 349, SAN LUIS OBISPO, CA 93406-0349
PO BOX 350, SAN LUIS OBISPO, CA 93406-0350
PO BOX 351, SAN LUIS OBISPO, CA 93406-0351
PO BOX 352, SAN LUIS OBISPO, CA 93406-0352
PO BOX 353, SAN LUIS OBISPO, CA 93406-0353
PO BOX 354, SAN LUIS OBISPO, CA 93406-0354
PO BOX 355, SAN LUIS OBISPO, CA 93406-0355
PO BOX 356, SAN LUIS OBISPO, CA 93406-0356
PO BOX 357, SAN LUIS OBISPO, CA 93406-0357
PO BOX 358, SAN LUIS OBISPO, CA 93406-0358
PO BOX 359, SAN LUIS OBISPO, CA 93406-0359
PO BOX 360, SAN LUIS OBISPO, CA 93406-0360
PO BOX 361, SAN LUIS OBISPO, CA 93406-0361
PO BOX 362, SAN LUIS OBISPO, CA 93406-0362
PO BOX 363, SAN LUIS OBISPO, CA 93406-0363
PO BOX 364, SAN LUIS OBISPO, CA 93406-0364
PO BOX 365, SAN LUIS OBISPO, CA 93406-0365
PO BOX 366, SAN LUIS OBISPO, CA 93406-0366
PO BOX 367, SAN LUIS OBISPO, CA 93406-0367
PO BOX 368, SAN LUIS OBISPO, CA 93406-0368
PO BOX 369, SAN LUIS OBISPO, CA 93406-0369
PO BOX 370, SAN LUIS OBISPO, CA 93406-0370
PO BOX 371, SAN LUIS OBISPO, CA 93406-0371
PO BOX 372, SAN LUIS OBISPO, CA 93406-0372
PO BOX 373, SAN LUIS OBISPO, CA 93406-0373
PO BOX 374, SAN LUIS OBISPO, CA 93406-0374
PO BOX 375, SAN LUIS OBISPO, CA 93406-0375
PO BOX 376, SAN LUIS OBISPO, CA 93406-0376
PO BOX 377, SAN LUIS OBISPO, CA 93406-0377
PO BOX 378, SAN LUIS OBISPO, CA 93406-0378
PO BOX 379, SAN LUIS OBISPO, CA 93406-0379
PO BOX 380, SAN LUIS OBISPO, CA 93406-0380
PO BOX 381, SAN LUIS OBISPO, CA 93406-0381
PO BOX 382, SAN LUIS OBISPO, CA 93406-0382
PO BOX 383, SAN LUIS OBISPO, CA 93406-0383
PO BOX 384, SAN LUIS OBISPO, CA 93406-0384
PO BOX 385, SAN LUIS OBISPO, CA 93406-0385
PO BOX 386, SAN LUIS OBISPO, CA 93406-0386
PO BOX 387, SAN LUIS OBISPO, CA 93406-0387
PO BOX 388, SAN LUIS OBISPO, CA 93406-0388
PO BOX 389, SAN LUIS OBISPO, CA 93406-0389
PO BOX 390, SAN LUIS OBISPO, CA 93406-0390
PO BOX 391, SAN LUIS OBISPO, CA 93406-0391
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