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, BISMARCK, ND 58502-0301
PO BOX 302, BISMARCK, ND 58502-0302
PO BOX 303, BISMARCK, ND 58502-0303
PO BOX 304, BISMARCK, ND 58502-0304
PO BOX 305, BISMARCK, ND 58502-0305
PO BOX 306, BISMARCK, ND 58502-0306
PO BOX 307, BISMARCK, ND 58502-0307
PO BOX 308, BISMARCK, ND 58502-0308
PO BOX 309, BISMARCK, ND 58502-0309
PO BOX 310, BISMARCK, ND 58502-0310
PO BOX 311, BISMARCK, ND 58502-0311
PO BOX 312, BISMARCK, ND 58502-0312
PO BOX 313, BISMARCK, ND 58502-0313
PO BOX 314, BISMARCK, ND 58502-0314
PO BOX 315, BISMARCK, ND 58502-0315
PO BOX 316, BISMARCK, ND 58502-0316
PO BOX 317, BISMARCK, ND 58502-0317
PO BOX 318, BISMARCK, ND 58502-0318
PO BOX 319, BISMARCK, ND 58502-0319
PO BOX 320, BISMARCK, ND 58502-0320
PO BOX 321, BISMARCK, ND 58502-0321
PO BOX 322, BISMARCK, ND 58502-0322
PO BOX 323, BISMARCK, ND 58502-0323
PO BOX 324, BISMARCK, ND 58502-0324
PO BOX 325, BISMARCK, ND 58502-0325
PO BOX 326, BISMARCK, ND 58502-0326
PO BOX 327, BISMARCK, ND 58502-0327
PO BOX 328, BISMARCK, ND 58502-0328
PO BOX 329, BISMARCK, ND 58502-0329
PO BOX 330, BISMARCK, ND 58502-0330
PO BOX 331, BISMARCK, ND 58502-0331
PO BOX 332, BISMARCK, ND 58502-0332
PO BOX 333, BISMARCK, ND 58502-0333
PO BOX 334, BISMARCK, ND 58502-0334
PO BOX 335, BISMARCK, ND 58502-0335
PO BOX 336, BISMARCK, ND 58502-0336
PO BOX 337, BISMARCK, ND 58502-0337
PO BOX 338, BISMARCK, ND 58502-0338
PO BOX 339, BISMARCK, ND 58502-0339
PO BOX 340, BISMARCK, ND 58502-0340
PO BOX 341, BISMARCK, ND 58502-0341
PO BOX 342, BISMARCK, ND 58502-0342
PO BOX 343, BISMARCK, ND 58502-0343
PO BOX 344, BISMARCK, ND 58502-0344
PO BOX 345, BISMARCK, ND 58502-0345
PO BOX 346, BISMARCK, ND 58502-0346
PO BOX 347, BISMARCK, ND 58502-0347
PO BOX 348, BISMARCK, ND 58502-0348
PO BOX 349, BISMARCK, ND 58502-0349
PO BOX 350, BISMARCK, ND 58502-0350
PO BOX 351, BISMARCK, ND 58502-0351
PO BOX 352, BISMARCK, ND 58502-0352
PO BOX 353, BISMARCK, ND 58502-0353
PO BOX 354, BISMARCK, ND 58502-0354
PO BOX 355, BISMARCK, ND 58502-0355
PO BOX 356, BISMARCK, ND 58502-0356
PO BOX 357, BISMARCK, ND 58502-0357
PO BOX 358, BISMARCK, ND 58502-0358
PO BOX 359, BISMARCK, ND 58502-0359
PO BOX 360, BISMARCK, ND 58502-0360
PO BOX 361, BISMARCK, ND 58502-0361
PO BOX 362, BISMARCK, ND 58502-0362
PO BOX 363, BISMARCK, ND 58502-0363
PO BOX 364, BISMARCK, ND 58502-0364
PO BOX 365, BISMARCK, ND 58502-0365
PO BOX 366, BISMARCK, ND 58502-0366
PO BOX 367, BISMARCK, ND 58502-0367
PO BOX 368, BISMARCK, ND 58502-0368
PO BOX 369, BISMARCK, ND 58502-0369
PO BOX 370, BISMARCK, ND 58502-0370
PO BOX 371, BISMARCK, ND 58502-0371
PO BOX 372, BISMARCK, ND 58502-0372
PO BOX 373, BISMARCK, ND 58502-0373
PO BOX 374, BISMARCK, ND 58502-0374
PO BOX 375, BISMARCK, ND 58502-0375
PO BOX 376, BISMARCK, ND 58502-0376
PO BOX 377, BISMARCK, ND 58502-0377
PO BOX 378, BISMARCK, ND 58502-0378
PO BOX 379, BISMARCK, ND 58502-0379
PO BOX 380, BISMARCK, ND 58502-0380
PO BOX 381, BISMARCK, ND 58502-0381
PO BOX 382, BISMARCK, ND 58502-0382
PO BOX 383, BISMARCK, ND 58502-0383
PO BOX 384, BISMARCK, ND 58502-0384
PO BOX 385, BISMARCK, ND 58502-0385
PO BOX 386, BISMARCK, ND 58502-0386
PO BOX 387, BISMARCK, ND 58502-0387
PO BOX 388, BISMARCK, ND 58502-0388
PO BOX 389, BISMARCK, ND 58502-0389
PO BOX 390, BISMARCK, ND 58502-0390
PO BOX 391, BISMARCK, ND 58502-0391
PO BOX 392, BISMARCK, ND 58502-0392
PO BOX 393, BISMARCK, ND 58502-0393
PO BOX 394, BISMARCK, ND 58502-0394
PO BOX 395, BISMARCK, ND 58502-0395
PO BOX 396, BISMARCK, ND 58502-0396
PO BOX 397, BISMARCK, ND 58502-0397
PO BOX 398, BISMARCK, ND 58502-0398
PO BOX 399, BISMARCK, ND 58502-0399
PO BOX 400, BISMARCK, ND 58502-0400
PO BOX 401, BISMARCK, ND 58502-0401
PO BOX 402, BISMARCK, ND 58502-0402
PO BOX 403, BISMARCK, ND 58502-0403
PO BOX 404, BISMARCK, ND 58502-0404
PO BOX 405, BISMARCK, ND 58502-0405
PO BOX 406, BISMARCK, ND 58502-0406
PO BOX 407, BISMARCK, ND 58502-0407
PO BOX 408, BISMARCK, ND 58502-0408
PO BOX 409, BISMARCK, ND 58502-0409
PO BOX 410, BISMARCK, ND 58502-0410
PO BOX 411, BISMARCK, ND 58502-0411
PO BOX 412, BISMARCK, ND 58502-0412
PO BOX 413, BISMARCK, ND 58502-0413
PO BOX 414, BISMARCK, ND 58502-0414
PO BOX 415, BISMARCK, ND 58502-0415
PO BOX 416, BISMARCK, ND 58502-0416
PO BOX 417, BISMARCK, ND 58502-0417
PO BOX 418, BISMARCK, ND 58502-0418
PO BOX 419, BISMARCK, ND 58502-0419
PO BOX 420, BISMARCK, ND 58502-0420
PO BOX 421, BISMARCK, ND 58502-0421
PO BOX 422, BISMARCK, ND 58502-0422
PO BOX 423, BISMARCK, ND 58502-0423
PO BOX 424, BISMARCK, ND 58502-0424
PO BOX 425, BISMARCK, ND 58502-0425
PO BOX 426, BISMARCK, ND 58502-0426
PO BOX 427, BISMARCK, ND 58502-0427
PO BOX 428, BISMARCK, ND 58502-0428
PO BOX 429, BISMARCK, ND 58502-0429
PO BOX 430, BISMARCK, ND 58502-0430
PO BOX 431, BISMARCK, ND 58502-0431
PO BOX 432, BISMARCK, ND 58502-0432
PO BOX 433, BISMARCK, ND 58502-0433
PO BOX 434, BISMARCK, ND 58502-0434
PO BOX 435, BISMARCK, ND 58502-0435
PO BOX 436, BISMARCK, ND 58502-0436
PO BOX 437, BISMARCK, ND 58502-0437
PO BOX 438, BISMARCK, ND 58502-0438
PO BOX 439, BISMARCK, ND 58502-0439
PO BOX 440, BISMARCK, ND 58502-0440
PO BOX 441, BISMARCK, ND 58502-0441
PO BOX 442, BISMARCK, ND 58502-0442
PO BOX 443, BISMARCK, ND 58502-0443
PO BOX 444, BISMARCK, ND 58502-0444
PO BOX 445, BISMARCK, ND 58502-0445
PO BOX 446, BISMARCK, ND 58502-0446
PO BOX 447, BISMARCK, ND 58502-0447
PO BOX 448, BISMARCK, ND 58502-0448
PO BOX 449, BISMARCK, ND 58502-0449
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