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 271, ROCKFORD, IA 50468-0271
PO BOX 272, ROCKFORD, IA 50468-0272
PO BOX 273, ROCKFORD, IA 50468-0273
PO BOX 274, ROCKFORD, IA 50468-0274
PO BOX 275, ROCKFORD, IA 50468-0275
PO BOX 276, ROCKFORD, IA 50468-0276
PO BOX 277, ROCKFORD, IA 50468-0277
PO BOX 278, ROCKFORD, IA 50468-0278
PO BOX 279, ROCKFORD, IA 50468-0279
PO BOX 280, ROCKFORD, IA 50468-0280
PO BOX 281, ROCKFORD, IA 50468-0281
PO BOX 282, ROCKFORD, IA 50468-0282
PO BOX 283, ROCKFORD, IA 50468-0283
PO BOX 284, ROCKFORD, IA 50468-0284
PO BOX 285, ROCKFORD, IA 50468-0285
PO BOX 286, ROCKFORD, IA 50468-0286
PO BOX 287, ROCKFORD, IA 50468-0287
PO BOX 288, ROCKFORD, IA 50468-0288
PO BOX 289, ROCKFORD, IA 50468-0289
PO BOX 290, ROCKFORD, IA 50468-0290
PO BOX 291, ROCKFORD, IA 50468-0291
PO BOX 292, ROCKFORD, IA 50468-0292
PO BOX 293, ROCKFORD, IA 50468-0293
PO BOX 294, ROCKFORD, IA 50468-0294
PO BOX 295, ROCKFORD, IA 50468-0295
PO BOX 296, ROCKFORD, IA 50468-0296
PO BOX 297, ROCKFORD, IA 50468-0297
PO BOX 298, ROCKFORD, IA 50468-0298
PO BOX 299, ROCKFORD, IA 50468-0299
PO BOX 300, ROCKFORD, IA 50468-0300
PO BOX 301, ROCKFORD, IA 50468-0301
PO BOX 302, ROCKFORD, IA 50468-0302
PO BOX 303, ROCKFORD, IA 50468-0303
PO BOX 304, ROCKFORD, IA 50468-0304
PO BOX 305, ROCKFORD, IA 50468-0305
PO BOX 306, ROCKFORD, IA 50468-0306
PO BOX 307, ROCKFORD, IA 50468-0307
PO BOX 308, ROCKFORD, IA 50468-0308
PO BOX 309, ROCKFORD, IA 50468-0309
PO BOX 310, ROCKFORD, IA 50468-0310
PO BOX 311, ROCKFORD, IA 50468-0311
PO BOX 312, ROCKFORD, IA 50468-0312
PO BOX 313, ROCKFORD, IA 50468-0313
PO BOX 314, ROCKFORD, IA 50468-0314
PO BOX 315, ROCKFORD, IA 50468-0315
PO BOX 316, ROCKFORD, IA 50468-0316
PO BOX 317, ROCKFORD, IA 50468-0317
PO BOX 318, ROCKFORD, IA 50468-0318
PO BOX 319, ROCKFORD, IA 50468-0319
PO BOX 320, ROCKFORD, IA 50468-0320
PO BOX 321, ROCKFORD, IA 50468-0321
PO BOX 322, ROCKFORD, IA 50468-0322
PO BOX 323, ROCKFORD, IA 50468-0323
PO BOX 324, ROCKFORD, IA 50468-0324
PO BOX 325, ROCKFORD, IA 50468-0325
PO BOX 326, ROCKFORD, IA 50468-0326
PO BOX 327, ROCKFORD, IA 50468-0327
PO BOX 328, ROCKFORD, IA 50468-0328
PO BOX 329, ROCKFORD, IA 50468-0329
PO BOX 330, ROCKFORD, IA 50468-0330
PO BOX 331, ROCKFORD, IA 50468-0331
PO BOX 332, ROCKFORD, IA 50468-0332
PO BOX 333, ROCKFORD, IA 50468-0333
PO BOX 334, ROCKFORD, IA 50468-0334
PO BOX 335, ROCKFORD, IA 50468-0335
PO BOX 336, ROCKFORD, IA 50468-0336
PO BOX 337, ROCKFORD, IA 50468-0337
PO BOX 338, ROCKFORD, IA 50468-0338
PO BOX 339, ROCKFORD, IA 50468-0339
PO BOX 340, ROCKFORD, IA 50468-0340
PO BOX 341, ROCKFORD, IA 50468-0341
PO BOX 342, ROCKFORD, IA 50468-0342
PO BOX 343, ROCKFORD, IA 50468-0343
PO BOX 344, ROCKFORD, IA 50468-0344
PO BOX 345, ROCKFORD, IA 50468-0345
PO BOX 346, ROCKFORD, IA 50468-0346
PO BOX 347, ROCKFORD, IA 50468-0347
PO BOX 348, ROCKFORD, IA 50468-0348
PO BOX 349, ROCKFORD, IA 50468-0349
PO BOX 350, ROCKFORD, IA 50468-0350
PO BOX 351, ROCKFORD, IA 50468-0351
PO BOX 352, ROCKFORD, IA 50468-0352
PO BOX 353, ROCKFORD, IA 50468-0353
PO BOX 354, ROCKFORD, IA 50468-0354
PO BOX 355, ROCKFORD, IA 50468-0355
PO BOX 356, ROCKFORD, IA 50468-0356
PO BOX 357, ROCKFORD, IA 50468-0357
PO BOX 358, ROCKFORD, IA 50468-0358
PO BOX 359, ROCKFORD, IA 50468-0359
PO BOX 360, ROCKFORD, IA 50468-0360
PO BOX 361, ROCKFORD, IA 50468-0361
PO BOX 362, ROCKFORD, IA 50468-0362
PO BOX 363, ROCKFORD, IA 50468-0363
PO BOX 364, ROCKFORD, IA 50468-0364
PO BOX 365, ROCKFORD, IA 50468-0365
PO BOX 366, ROCKFORD, IA 50468-0366
PO BOX 367, ROCKFORD, IA 50468-0367
PO BOX 368, ROCKFORD, IA 50468-0368
PO BOX 369, ROCKFORD, IA 50468-0369
PO BOX 370, ROCKFORD, IA 50468-0370
PO BOX 371, ROCKFORD, IA 50468-0371
PO BOX 372, ROCKFORD, IA 50468-0372
PO BOX 373, ROCKFORD, IA 50468-0373
PO BOX 374, ROCKFORD, IA 50468-0374
PO BOX 375, ROCKFORD, IA 50468-0375
PO BOX 376, ROCKFORD, IA 50468-0376
PO BOX 377, ROCKFORD, IA 50468-0377
PO BOX 378, ROCKFORD, IA 50468-0378
PO BOX 379, ROCKFORD, IA 50468-0379
PO BOX 380, ROCKFORD, IA 50468-0380
PO BOX 381, ROCKFORD, IA 50468-0381
PO BOX 382, ROCKFORD, IA 50468-0382
PO BOX 383, ROCKFORD, IA 50468-0383
PO BOX 384, ROCKFORD, IA 50468-0384
PO BOX 385, ROCKFORD, IA 50468-0385
PO BOX 386, ROCKFORD, IA 50468-0386
PO BOX 387, ROCKFORD, IA 50468-0387
PO BOX 388, ROCKFORD, IA 50468-0388
PO BOX 389, ROCKFORD, IA 50468-0389
PO BOX 390, ROCKFORD, IA 50468-0390
PO BOX 391, ROCKFORD, IA 50468-0391
PO BOX 392, ROCKFORD, IA 50468-0392
PO BOX 393, ROCKFORD, IA 50468-0393
PO BOX 394, ROCKFORD, IA 50468-0394
PO BOX 395, ROCKFORD, IA 50468-0395
PO BOX 396, ROCKFORD, IA 50468-0396
PO BOX 397, ROCKFORD, IA 50468-0397
PO BOX 398, ROCKFORD, IA 50468-0398
PO BOX 399, ROCKFORD, IA 50468-0399
PO BOX 400, ROCKFORD, IA 50468-0400
PO BOX 401, ROCKFORD, IA 50468-0401
PO BOX 402, ROCKFORD, IA 50468-0402
PO BOX 403, ROCKFORD, IA 50468-0403
PO BOX 404, ROCKFORD, IA 50468-0404
PO BOX 405, ROCKFORD, IA 50468-0405
PO BOX 406, ROCKFORD, IA 50468-0406
PO BOX 407, ROCKFORD, IA 50468-0407
PO BOX 408, ROCKFORD, IA 50468-0408
PO BOX 409, ROCKFORD, IA 50468-0409
PO BOX 410, ROCKFORD, IA 50468-0410
PO BOX 411, ROCKFORD, IA 50468-0411
PO BOX 412, ROCKFORD, IA 50468-0412
PO BOX 413, ROCKFORD, IA 50468-0413
PO BOX 414, ROCKFORD, IA 50468-0414
PO BOX 415, ROCKFORD, IA 50468-0415
PO BOX 416, ROCKFORD, IA 50468-0416
PO BOX 417, ROCKFORD, IA 50468-0417
PO BOX 418, ROCKFORD, IA 50468-0418
PO BOX 419, ROCKFORD, IA 50468-0419
PO BOX 420, ROCKFORD, IA 50468-0420
PO BOX 421, ROCKFORD, IA 50468-0421
PO BOX 422, ROCKFORD, IA 50468-0422
PO BOX 423, ROCKFORD, IA 50468-0423
PO BOX 424, ROCKFORD, IA 50468-0424
PO BOX 425, ROCKFORD, IA 50468-0425
PO BOX 426, ROCKFORD, IA 50468-0426
PO BOX 427, ROCKFORD, IA 50468-0427
PO BOX 428, ROCKFORD, IA 50468-0428
PO BOX 429, ROCKFORD, IA 50468-0429
PO BOX 430, ROCKFORD, IA 50468-0430
PO BOX 431, ROCKFORD, IA 50468-0431
PO BOX 432, ROCKFORD, IA 50468-0432
PO BOX 433, ROCKFORD, IA 50468-0433
PO BOX 434, ROCKFORD, IA 50468-0434
PO BOX 435, ROCKFORD, IA 50468-0435
PO BOX 436, ROCKFORD, IA 50468-0436
PO BOX 437, ROCKFORD, IA 50468-0437
PO BOX 438, ROCKFORD, IA 50468-0438
PO BOX 439, ROCKFORD, IA 50468-0439
PO BOX 440, ROCKFORD, IA 50468-0440
PO BOX 441, ROCKFORD, IA 50468-0441
PO BOX 442, ROCKFORD, IA 50468-0442
PO BOX 443, ROCKFORD, IA 50468-0443
PO BOX 444, ROCKFORD, IA 50468-0444
PO BOX 445, ROCKFORD, IA 50468-0445
PO BOX 446, ROCKFORD, IA 50468-0446
PO BOX 447, ROCKFORD, IA 50468-0447
PO BOX 448, ROCKFORD, IA 50468-0448
PO BOX 449, ROCKFORD, IA 50468-0449
PO BOX 450, ROCKFORD, IA 50468-0450
PO BOX 451, ROCKFORD, IA 50468-0451
PO BOX 452, ROCKFORD, IA 50468-0452
PO BOX 453, ROCKFORD, IA 50468-0453
PO BOX 454, ROCKFORD, IA 50468-0454
PO BOX 455, ROCKFORD, IA 50468-0455
PO BOX 456, ROCKFORD, IA 50468-0456
PO BOX 457, ROCKFORD, IA 50468-0457
PO BOX 458, ROCKFORD, IA 50468-0458
PO BOX 459, ROCKFORD, IA 50468-0459
PO BOX 460, ROCKFORD, IA 50468-0460
PO BOX 461, ROCKFORD, IA 50468-0461
PO BOX 462, ROCKFORD, IA 50468-0462
PO BOX 463, ROCKFORD, IA 50468-0463
PO BOX 464, ROCKFORD, IA 50468-0464
PO BOX 465, ROCKFORD, IA 50468-0465
PO BOX 466, ROCKFORD, IA 50468-0466
PO BOX 467, ROCKFORD, IA 50468-0467
PO BOX 468, ROCKFORD, IA 50468-0468
PO BOX 469, ROCKFORD, IA 50468-0469
PO BOX 470, ROCKFORD, IA 50468-0470
PO BOX 471, ROCKFORD, IA 50468-0471
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