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, SCRANTON, IA 51462-0301
PO BOX 302, SCRANTON, IA 51462-0302
PO BOX 303, SCRANTON, IA 51462-0303
PO BOX 304, SCRANTON, IA 51462-0304
PO BOX 305, SCRANTON, IA 51462-0305
PO BOX 306, SCRANTON, IA 51462-0306
PO BOX 307, SCRANTON, IA 51462-0307
PO BOX 308, SCRANTON, IA 51462-0308
PO BOX 309, SCRANTON, IA 51462-0309
PO BOX 310, SCRANTON, IA 51462-0310
PO BOX 311, SCRANTON, IA 51462-0311
PO BOX 312, SCRANTON, IA 51462-0312
PO BOX 313, SCRANTON, IA 51462-0313
PO BOX 314, SCRANTON, IA 51462-0314
PO BOX 315, SCRANTON, IA 51462-0315
PO BOX 316, SCRANTON, IA 51462-0316
PO BOX 317, SCRANTON, IA 51462-0317
PO BOX 318, SCRANTON, IA 51462-0318
PO BOX 319, SCRANTON, IA 51462-0319
PO BOX 320, SCRANTON, IA 51462-0320
PO BOX 321, SCRANTON, IA 51462-0321
PO BOX 322, SCRANTON, IA 51462-0322
PO BOX 323, SCRANTON, IA 51462-0323
PO BOX 324, SCRANTON, IA 51462-0324
PO BOX 325, SCRANTON, IA 51462-0325
PO BOX 326, SCRANTON, IA 51462-0326
PO BOX 327, SCRANTON, IA 51462-0327
PO BOX 328, SCRANTON, IA 51462-0328
PO BOX 329, SCRANTON, IA 51462-0329
PO BOX 330, SCRANTON, IA 51462-0330
PO BOX 331, SCRANTON, IA 51462-0331
PO BOX 332, SCRANTON, IA 51462-0332
PO BOX 333, SCRANTON, IA 51462-0333
PO BOX 334, SCRANTON, IA 51462-0334
PO BOX 335, SCRANTON, IA 51462-0335
PO BOX 336, SCRANTON, IA 51462-0336
PO BOX 337, SCRANTON, IA 51462-0337
PO BOX 338, SCRANTON, IA 51462-0338
PO BOX 339, SCRANTON, IA 51462-0339
PO BOX 340, SCRANTON, IA 51462-0340
PO BOX 341, SCRANTON, IA 51462-0341
PO BOX 342, SCRANTON, IA 51462-0342
PO BOX 343, SCRANTON, IA 51462-0343
PO BOX 344, SCRANTON, IA 51462-0344
PO BOX 345, SCRANTON, IA 51462-0345
PO BOX 346, SCRANTON, IA 51462-0346
PO BOX 347, SCRANTON, IA 51462-0347
PO BOX 348, SCRANTON, IA 51462-0348
PO BOX 349, SCRANTON, IA 51462-0349
PO BOX 350, SCRANTON, IA 51462-0350
PO BOX 351, SCRANTON, IA 51462-0351
PO BOX 352, SCRANTON, IA 51462-0352
PO BOX 353, SCRANTON, IA 51462-0353
PO BOX 354, SCRANTON, IA 51462-0354
PO BOX 355, SCRANTON, IA 51462-0355
PO BOX 356, SCRANTON, IA 51462-0356
PO BOX 357, SCRANTON, IA 51462-0357
PO BOX 358, SCRANTON, IA 51462-0358
PO BOX 359, SCRANTON, IA 51462-0359
PO BOX 360, SCRANTON, IA 51462-0360
PO BOX 361, SCRANTON, IA 51462-0361
PO BOX 362, SCRANTON, IA 51462-0362
PO BOX 363, SCRANTON, IA 51462-0363
PO BOX 364, SCRANTON, IA 51462-0364
PO BOX 365, SCRANTON, IA 51462-0365
PO BOX 366, SCRANTON, IA 51462-0366
PO BOX 367, SCRANTON, IA 51462-0367
PO BOX 368, SCRANTON, IA 51462-0368
PO BOX 369, SCRANTON, IA 51462-0369
PO BOX 370, SCRANTON, IA 51462-0370
PO BOX 371, SCRANTON, IA 51462-0371
PO BOX 372, SCRANTON, IA 51462-0372
PO BOX 373, SCRANTON, IA 51462-0373
PO BOX 374, SCRANTON, IA 51462-0374
PO BOX 375, SCRANTON, IA 51462-0375
PO BOX 376, SCRANTON, IA 51462-0376
PO BOX 377, SCRANTON, IA 51462-0377
PO BOX 378, SCRANTON, IA 51462-0378
PO BOX 379, SCRANTON, IA 51462-0379
PO BOX 380, SCRANTON, IA 51462-0380
PO BOX 381, SCRANTON, IA 51462-0381
PO BOX 382, SCRANTON, IA 51462-0382
PO BOX 383, SCRANTON, IA 51462-0383
PO BOX 384, SCRANTON, IA 51462-0384
PO BOX 385, SCRANTON, IA 51462-0385
PO BOX 386, SCRANTON, IA 51462-0386
PO BOX 387, SCRANTON, IA 51462-0387
PO BOX 388, SCRANTON, IA 51462-0388
PO BOX 389, SCRANTON, IA 51462-0389
PO BOX 390, SCRANTON, IA 51462-0390
PO BOX 391, SCRANTON, IA 51462-0391
PO BOX 392, SCRANTON, IA 51462-0392
PO BOX 393, SCRANTON, IA 51462-0393
PO BOX 394, SCRANTON, IA 51462-0394
PO BOX 395, SCRANTON, IA 51462-0395
PO BOX 396, SCRANTON, IA 51462-0396
PO BOX 397, SCRANTON, IA 51462-0397
PO BOX 398, SCRANTON, IA 51462-0398
PO BOX 399, SCRANTON, IA 51462-0399
PO BOX 400, SCRANTON, IA 51462-0400
PO BOX 401, SCRANTON, IA 51462-0401
PO BOX 402, SCRANTON, IA 51462-0402
PO BOX 403, SCRANTON, IA 51462-0403
PO BOX 404, SCRANTON, IA 51462-0404
PO BOX 405, SCRANTON, IA 51462-0405
PO BOX 406, SCRANTON, IA 51462-0406
PO BOX 407, SCRANTON, IA 51462-0407
PO BOX 408, SCRANTON, IA 51462-0408
PO BOX 409, SCRANTON, IA 51462-0409
PO BOX 410, SCRANTON, IA 51462-0410
PO BOX 411, SCRANTON, IA 51462-0411
PO BOX 412, SCRANTON, IA 51462-0412
PO BOX 413, SCRANTON, IA 51462-0413
PO BOX 414, SCRANTON, IA 51462-0414
PO BOX 415, SCRANTON, IA 51462-0415
PO BOX 416, SCRANTON, IA 51462-0416
PO BOX 417, SCRANTON, IA 51462-0417
PO BOX 418, SCRANTON, IA 51462-0418
PO BOX 419, SCRANTON, IA 51462-0419
PO BOX 420, SCRANTON, IA 51462-0420
PO BOX 421, SCRANTON, IA 51462-0421
PO BOX 422, SCRANTON, IA 51462-0422
PO BOX 423, SCRANTON, IA 51462-0423
PO BOX 424, SCRANTON, IA 51462-0424
PO BOX 425, SCRANTON, IA 51462-0425
PO BOX 426, SCRANTON, IA 51462-0426
PO BOX 427, SCRANTON, IA 51462-0427
PO BOX 428, SCRANTON, IA 51462-0428
PO BOX 429, SCRANTON, IA 51462-0429
PO BOX 430, SCRANTON, IA 51462-0430
PO BOX 431, SCRANTON, IA 51462-0431
PO BOX 432, SCRANTON, IA 51462-0432
PO BOX 433, SCRANTON, IA 51462-0433
PO BOX 434, SCRANTON, IA 51462-0434
PO BOX 435, SCRANTON, IA 51462-0435
PO BOX 436, SCRANTON, IA 51462-0436
PO BOX 437, SCRANTON, IA 51462-0437
PO BOX 438, SCRANTON, IA 51462-0438
PO BOX 439, SCRANTON, IA 51462-0439
PO BOX 440, SCRANTON, IA 51462-0440
PO BOX 441, SCRANTON, IA 51462-0441
PO BOX 442, SCRANTON, IA 51462-0442
PO BOX 443, SCRANTON, IA 51462-0443
PO BOX 444, SCRANTON, IA 51462-0444
PO BOX 445, SCRANTON, IA 51462-0445
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