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 301, CARLSBAD, NM 88221-0301
PO BOX 302, CARLSBAD, NM 88221-0302
PO BOX 303, CARLSBAD, NM 88221-0303
PO BOX 304, CARLSBAD, NM 88221-0304
PO BOX 305, CARLSBAD, NM 88221-0305
PO BOX 306, CARLSBAD, NM 88221-0306
PO BOX 307, CARLSBAD, NM 88221-0307
PO BOX 308, CARLSBAD, NM 88221-0308
PO BOX 309, CARLSBAD, NM 88221-0309
PO BOX 310, CARLSBAD, NM 88221-0310
PO BOX 311, CARLSBAD, NM 88221-0311
PO BOX 312, CARLSBAD, NM 88221-0312
PO BOX 313, CARLSBAD, NM 88221-0313
PO BOX 314, CARLSBAD, NM 88221-0314
PO BOX 315, CARLSBAD, NM 88221-0315
PO BOX 316, CARLSBAD, NM 88221-0316
PO BOX 317, CARLSBAD, NM 88221-0317
PO BOX 318, CARLSBAD, NM 88221-0318
PO BOX 319, CARLSBAD, NM 88221-0319
PO BOX 320, CARLSBAD, NM 88221-0320
PO BOX 321, CARLSBAD, NM 88221-0321
PO BOX 322, CARLSBAD, NM 88221-0322
PO BOX 323, CARLSBAD, NM 88221-0323
PO BOX 324, CARLSBAD, NM 88221-0324
PO BOX 325, CARLSBAD, NM 88221-0325
PO BOX 326, CARLSBAD, NM 88221-0326
PO BOX 327, CARLSBAD, NM 88221-0327
PO BOX 328, CARLSBAD, NM 88221-0328
PO BOX 329, CARLSBAD, NM 88221-0329
PO BOX 330, CARLSBAD, NM 88221-0330
PO BOX 331, CARLSBAD, NM 88221-0331
PO BOX 332, CARLSBAD, NM 88221-0332
PO BOX 333, CARLSBAD, NM 88221-0333
PO BOX 334, CARLSBAD, NM 88221-0334
PO BOX 335, CARLSBAD, NM 88221-0335
PO BOX 336, CARLSBAD, NM 88221-0336
PO BOX 337, CARLSBAD, NM 88221-0337
PO BOX 338, CARLSBAD, NM 88221-0338
PO BOX 339, CARLSBAD, NM 88221-0339
PO BOX 340, CARLSBAD, NM 88221-0340
PO BOX 341, CARLSBAD, NM 88221-0341
PO BOX 342, CARLSBAD, NM 88221-0342
PO BOX 343, CARLSBAD, NM 88221-0343
PO BOX 344, CARLSBAD, NM 88221-0344
PO BOX 345, CARLSBAD, NM 88221-0345
PO BOX 346, CARLSBAD, NM 88221-0346
PO BOX 347, CARLSBAD, NM 88221-0347
PO BOX 348, CARLSBAD, NM 88221-0348
PO BOX 349, CARLSBAD, NM 88221-0349
PO BOX 350, CARLSBAD, NM 88221-0350
PO BOX 351, CARLSBAD, NM 88221-0351
PO BOX 352, CARLSBAD, NM 88221-0352
PO BOX 353, CARLSBAD, NM 88221-0353
PO BOX 354, CARLSBAD, NM 88221-0354
PO BOX 355, CARLSBAD, NM 88221-0355
PO BOX 356, CARLSBAD, NM 88221-0356
PO BOX 357, CARLSBAD, NM 88221-0357
PO BOX 358, CARLSBAD, NM 88221-0358
PO BOX 359, CARLSBAD, NM 88221-0359
PO BOX 360, CARLSBAD, NM 88221-0360
PO BOX 361, CARLSBAD, NM 88221-0361
PO BOX 362, CARLSBAD, NM 88221-0362
PO BOX 363, CARLSBAD, NM 88221-0363
PO BOX 364, CARLSBAD, NM 88221-0364
PO BOX 365, CARLSBAD, NM 88221-0365
PO BOX 366, CARLSBAD, NM 88221-0366
PO BOX 367, CARLSBAD, NM 88221-0367
PO BOX 368, CARLSBAD, NM 88221-0368
PO BOX 369, CARLSBAD, NM 88221-0369
PO BOX 370, CARLSBAD, NM 88221-0370
PO BOX 371, CARLSBAD, NM 88221-0371
PO BOX 372, CARLSBAD, NM 88221-0372
PO BOX 373, CARLSBAD, NM 88221-0373
PO BOX 374, CARLSBAD, NM 88221-0374
PO BOX 375, CARLSBAD, NM 88221-0375
PO BOX 376, CARLSBAD, NM 88221-0376
PO BOX 377, CARLSBAD, NM 88221-0377
PO BOX 378, CARLSBAD, NM 88221-0378
PO BOX 379, CARLSBAD, NM 88221-0379
PO BOX 380, CARLSBAD, NM 88221-0380
PO BOX 381, CARLSBAD, NM 88221-0381
PO BOX 382, CARLSBAD, NM 88221-0382
PO BOX 383, CARLSBAD, NM 88221-0383
PO BOX 384, CARLSBAD, NM 88221-0384
PO BOX 385, CARLSBAD, NM 88221-0385
PO BOX 386, CARLSBAD, NM 88221-0386
PO BOX 387, CARLSBAD, NM 88221-0387
PO BOX 388, CARLSBAD, NM 88221-0388
PO BOX 389, CARLSBAD, NM 88221-0389
PO BOX 390, CARLSBAD, NM 88221-0390
PO BOX 391, CARLSBAD, NM 88221-0391
PO BOX 392, CARLSBAD, NM 88221-0392
PO BOX 393, CARLSBAD, NM 88221-0393
PO BOX 394, CARLSBAD, NM 88221-0394
PO BOX 395, CARLSBAD, NM 88221-0395
PO BOX 396, CARLSBAD, NM 88221-0396
PO BOX 397, CARLSBAD, NM 88221-0397
PO BOX 398, CARLSBAD, NM 88221-0398
PO BOX 399, CARLSBAD, NM 88221-0399
PO BOX 400, CARLSBAD, NM 88221-0400
PO BOX 401, CARLSBAD, NM 88221-0401
PO BOX 402, CARLSBAD, NM 88221-0402
PO BOX 403, CARLSBAD, NM 88221-0403
PO BOX 404, CARLSBAD, NM 88221-0404
PO BOX 405, CARLSBAD, NM 88221-0405
PO BOX 406, CARLSBAD, NM 88221-0406
PO BOX 407, CARLSBAD, NM 88221-0407
PO BOX 408, CARLSBAD, NM 88221-0408
PO BOX 409, CARLSBAD, NM 88221-0409
PO BOX 410, CARLSBAD, NM 88221-0410
PO BOX 411, CARLSBAD, NM 88221-0411
PO BOX 412, CARLSBAD, NM 88221-0412
PO BOX 413, CARLSBAD, NM 88221-0413
PO BOX 414, CARLSBAD, NM 88221-0414
PO BOX 415, CARLSBAD, NM 88221-0415
PO BOX 416, CARLSBAD, NM 88221-0416
PO BOX 417, CARLSBAD, NM 88221-0417
PO BOX 418, CARLSBAD, NM 88221-0418
PO BOX 419, CARLSBAD, NM 88221-0419
PO BOX 420, CARLSBAD, NM 88221-0420
PO BOX 421, CARLSBAD, NM 88221-0421
PO BOX 422, CARLSBAD, NM 88221-0422
PO BOX 423, CARLSBAD, NM 88221-0423
PO BOX 424, CARLSBAD, NM 88221-0424
PO BOX 425, CARLSBAD, NM 88221-0425
PO BOX 426, CARLSBAD, NM 88221-0426
PO BOX 427, CARLSBAD, NM 88221-0427
PO BOX 428, CARLSBAD, NM 88221-0428
PO BOX 429, CARLSBAD, NM 88221-0429
PO BOX 430, CARLSBAD, NM 88221-0430
PO BOX 431, CARLSBAD, NM 88221-0431
PO BOX 432, CARLSBAD, NM 88221-0432
PO BOX 433, CARLSBAD, NM 88221-0433
PO BOX 434, CARLSBAD, NM 88221-0434
PO BOX 435, CARLSBAD, NM 88221-0435
PO BOX 436, CARLSBAD, NM 88221-0436
PO BOX 437, CARLSBAD, NM 88221-0437
PO BOX 438, CARLSBAD, NM 88221-0438
PO BOX 439, CARLSBAD, NM 88221-0439
PO BOX 440, CARLSBAD, NM 88221-0440
PO BOX 441, CARLSBAD, NM 88221-0441
PO BOX 442, CARLSBAD, NM 88221-0442
PO BOX 443, CARLSBAD, NM 88221-0443
PO BOX 444, CARLSBAD, NM 88221-0444
PO BOX 445, CARLSBAD, NM 88221-0445
PO BOX 446, CARLSBAD, NM 88221-0446
PO BOX 447, CARLSBAD, NM 88221-0447
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