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 241, SAN MARCOS, CA 92079-0241
PO BOX 242, SAN MARCOS, CA 92079-0242
PO BOX 243, SAN MARCOS, CA 92079-0243
PO BOX 244, SAN MARCOS, CA 92079-0244
PO BOX 245, SAN MARCOS, CA 92079-0245
PO BOX 246, SAN MARCOS, CA 92079-0246
PO BOX 247, SAN MARCOS, CA 92079-0247
PO BOX 248, SAN MARCOS, CA 92079-0248
PO BOX 249, SAN MARCOS, CA 92079-0249
PO BOX 250, SAN MARCOS, CA 92079-0250
PO BOX 251, SAN MARCOS, CA 92079-0251
PO BOX 252, SAN MARCOS, CA 92079-0252
PO BOX 253, SAN MARCOS, CA 92079-0253
PO BOX 254, SAN MARCOS, CA 92079-0254
PO BOX 255, SAN MARCOS, CA 92079-0255
PO BOX 256, SAN MARCOS, CA 92079-0256
PO BOX 257, SAN MARCOS, CA 92079-0257
PO BOX 258, SAN MARCOS, CA 92079-0258
PO BOX 259, SAN MARCOS, CA 92079-0259
PO BOX 260, SAN MARCOS, CA 92079-0260
PO BOX 261, SAN MARCOS, CA 92079-0261
PO BOX 262, SAN MARCOS, CA 92079-0262
PO BOX 263, SAN MARCOS, CA 92079-0263
PO BOX 264, SAN MARCOS, CA 92079-0264
PO BOX 265, SAN MARCOS, CA 92079-0265
PO BOX 266, SAN MARCOS, CA 92079-0266
PO BOX 267, SAN MARCOS, CA 92079-0267
PO BOX 268, SAN MARCOS, CA 92079-0268
PO BOX 269, SAN MARCOS, CA 92079-0269
PO BOX 270, SAN MARCOS, CA 92079-0270
PO BOX 271, SAN MARCOS, CA 92079-0271
PO BOX 272, SAN MARCOS, CA 92079-0272
PO BOX 273, SAN MARCOS, CA 92079-0273
PO BOX 274, SAN MARCOS, CA 92079-0274
PO BOX 275, SAN MARCOS, CA 92079-0275
PO BOX 276, SAN MARCOS, CA 92079-0276
PO BOX 277, SAN MARCOS, CA 92079-0277
PO BOX 278, SAN MARCOS, CA 92079-0278
PO BOX 279, SAN MARCOS, CA 92079-0279
PO BOX 280, SAN MARCOS, CA 92079-0280
PO BOX 281, SAN MARCOS, CA 92079-0281
PO BOX 282, SAN MARCOS, CA 92079-0282
PO BOX 283, SAN MARCOS, CA 92079-0283
PO BOX 284, SAN MARCOS, CA 92079-0284
PO BOX 285, SAN MARCOS, CA 92079-0285
PO BOX 286, SAN MARCOS, CA 92079-0286
PO BOX 287, SAN MARCOS, CA 92079-0287
PO BOX 288, SAN MARCOS, CA 92079-0288
PO BOX 289, SAN MARCOS, CA 92079-0289
PO BOX 290, SAN MARCOS, CA 92079-0290
PO BOX 291, SAN MARCOS, CA 92079-0291
PO BOX 292, SAN MARCOS, CA 92079-0292
PO BOX 293, SAN MARCOS, CA 92079-0293
PO BOX 294, SAN MARCOS, CA 92079-0294
PO BOX 295, SAN MARCOS, CA 92079-0295
PO BOX 296, SAN MARCOS, CA 92079-0296
PO BOX 297, SAN MARCOS, CA 92079-0297
PO BOX 298, SAN MARCOS, CA 92079-0298
PO BOX 299, SAN MARCOS, CA 92079-0299
PO BOX 300, SAN MARCOS, CA 92079-0300
PO BOX 301, SAN MARCOS, CA 92079-0301
PO BOX 302, SAN MARCOS, CA 92079-0302
PO BOX 303, SAN MARCOS, CA 92079-0303
PO BOX 304, SAN MARCOS, CA 92079-0304
PO BOX 305, SAN MARCOS, CA 92079-0305
PO BOX 306, SAN MARCOS, CA 92079-0306
PO BOX 307, SAN MARCOS, CA 92079-0307
PO BOX 308, SAN MARCOS, CA 92079-0308
PO BOX 309, SAN MARCOS, CA 92079-0309
PO BOX 310, SAN MARCOS, CA 92079-0310
PO BOX 311, SAN MARCOS, CA 92079-0311
PO BOX 312, SAN MARCOS, CA 92079-0312
PO BOX 313, SAN MARCOS, CA 92079-0313
PO BOX 314, SAN MARCOS, CA 92079-0314
PO BOX 315, SAN MARCOS, CA 92079-0315
PO BOX 316, SAN MARCOS, CA 92079-0316
PO BOX 317, SAN MARCOS, CA 92079-0317
PO BOX 318, SAN MARCOS, CA 92079-0318
PO BOX 319, SAN MARCOS, CA 92079-0319
PO BOX 320, SAN MARCOS, CA 92079-0320
PO BOX 321, SAN MARCOS, CA 92079-0321
PO BOX 322, SAN MARCOS, CA 92079-0322
PO BOX 323, SAN MARCOS, CA 92079-0323
PO BOX 324, SAN MARCOS, CA 92079-0324
PO BOX 325, SAN MARCOS, CA 92079-0325
PO BOX 326, SAN MARCOS, CA 92079-0326
PO BOX 327, SAN MARCOS, CA 92079-0327
PO BOX 328, SAN MARCOS, CA 92079-0328
PO BOX 329, SAN MARCOS, CA 92079-0329
PO BOX 330, SAN MARCOS, CA 92079-0330
PO BOX 331, SAN MARCOS, CA 92079-0331
PO BOX 332, SAN MARCOS, CA 92079-0332
PO BOX 333, SAN MARCOS, CA 92079-0333
PO BOX 334, SAN MARCOS, CA 92079-0334
PO BOX 335, SAN MARCOS, CA 92079-0335
PO BOX 336, SAN MARCOS, CA 92079-0336
PO BOX 337, SAN MARCOS, CA 92079-0337
PO BOX 338, SAN MARCOS, CA 92079-0338
PO BOX 339, SAN MARCOS, CA 92079-0339
PO BOX 340, SAN MARCOS, CA 92079-0340
PO BOX 341, SAN MARCOS, CA 92079-0341
PO BOX 342, SAN MARCOS, CA 92079-0342
PO BOX 343, SAN MARCOS, CA 92079-0343
PO BOX 344, SAN MARCOS, CA 92079-0344
PO BOX 345, SAN MARCOS, CA 92079-0345
PO BOX 346, SAN MARCOS, CA 92079-0346
PO BOX 347, SAN MARCOS, CA 92079-0347
PO BOX 348, SAN MARCOS, CA 92079-0348
PO BOX 349, SAN MARCOS, CA 92079-0349
PO BOX 350, SAN MARCOS, CA 92079-0350
PO BOX 351, SAN MARCOS, CA 92079-0351
PO BOX 352, SAN MARCOS, CA 92079-0352
PO BOX 353, SAN MARCOS, CA 92079-0353
PO BOX 354, SAN MARCOS, CA 92079-0354
PO BOX 355, SAN MARCOS, CA 92079-0355
PO BOX 356, SAN MARCOS, CA 92079-0356
PO BOX 357, SAN MARCOS, CA 92079-0357
PO BOX 358, SAN MARCOS, CA 92079-0358
PO BOX 359, SAN MARCOS, CA 92079-0359
PO BOX 360, SAN MARCOS, CA 92079-0360
PO BOX 361, SAN MARCOS, CA 92079-0361
PO BOX 362, SAN MARCOS, CA 92079-0362
PO BOX 363, SAN MARCOS, CA 92079-0363
PO BOX 364, SAN MARCOS, CA 92079-0364
PO BOX 365, SAN MARCOS, CA 92079-0365
PO BOX 366, SAN MARCOS, CA 92079-0366
PO BOX 367, SAN MARCOS, CA 92079-0367
PO BOX 368, SAN MARCOS, CA 92079-0368
PO BOX 369, SAN MARCOS, CA 92079-0369
PO BOX 370, SAN MARCOS, CA 92079-0370
PO BOX 371, SAN MARCOS, CA 92079-0371
PO BOX 372, SAN MARCOS, CA 92079-0372
PO BOX 373, SAN MARCOS, CA 92079-0373
PO BOX 374, SAN MARCOS, CA 92079-0374
PO BOX 375, SAN MARCOS, CA 92079-0375
PO BOX 376, SAN MARCOS, CA 92079-0376
PO BOX 377, SAN MARCOS, CA 92079-0377
PO BOX 378, SAN MARCOS, CA 92079-0378
PO BOX 379, SAN MARCOS, CA 92079-0379
PO BOX 380, SAN MARCOS, CA 92079-0380
PO BOX 381, SAN MARCOS, CA 92079-0381
PO BOX 382, SAN MARCOS, CA 92079-0382
PO BOX 383, SAN MARCOS, CA 92079-0383
PO BOX 384, SAN MARCOS, CA 92079-0384
PO BOX 385, SAN MARCOS, CA 92079-0385
PO BOX 386, SAN MARCOS, CA 92079-0386
PO BOX 387, SAN MARCOS, CA 92079-0387
PO BOX 388, SAN MARCOS, CA 92079-0388
PO BOX 389, SAN MARCOS, CA 92079-0389
PO BOX 390, SAN MARCOS, CA 92079-0390
PO BOX 391, SAN MARCOS, CA 92079-0391
PO BOX 392, SAN MARCOS, CA 92079-0392
PO BOX 393, SAN MARCOS, CA 92079-0393
PO BOX 394, SAN MARCOS, CA 92079-0394
PO BOX 395, SAN MARCOS, CA 92079-0395
PO BOX 396, SAN MARCOS, CA 92079-0396
PO BOX 397, SAN MARCOS, CA 92079-0397
PO BOX 398, SAN MARCOS, CA 92079-0398
PO BOX 399, SAN MARCOS, CA 92079-0399
PO BOX 400, SAN MARCOS, CA 92079-0400
PO BOX 401, SAN MARCOS, CA 92079-0401
PO BOX 402, SAN MARCOS, CA 92079-0402
PO BOX 403, SAN MARCOS, CA 92079-0403
PO BOX 404, SAN MARCOS, CA 92079-0404
PO BOX 405, SAN MARCOS, CA 92079-0405
PO BOX 406, SAN MARCOS, CA 92079-0406
PO BOX 407, SAN MARCOS, CA 92079-0407
PO BOX 408, SAN MARCOS, CA 92079-0408
PO BOX 409, SAN MARCOS, CA 92079-0409
PO BOX 410, SAN MARCOS, CA 92079-0410
PO BOX 411, SAN MARCOS, CA 92079-0411
PO BOX 412, SAN MARCOS, CA 92079-0412
PO BOX 413, SAN MARCOS, CA 92079-0413
PO BOX 414, SAN MARCOS, CA 92079-0414
PO BOX 415, SAN MARCOS, CA 92079-0415
PO BOX 416, SAN MARCOS, CA 92079-0416
PO BOX 417, SAN MARCOS, CA 92079-0417
PO BOX 418, SAN MARCOS, CA 92079-0418
PO BOX 419, SAN MARCOS, CA 92079-0419
PO BOX 420, SAN MARCOS, CA 92079-0420
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