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 251, ALTON, IA 51003-0251
PO BOX 252, ALTON, IA 51003-0252
PO BOX 253, ALTON, IA 51003-0253
PO BOX 254, ALTON, IA 51003-0254
PO BOX 255, ALTON, IA 51003-0255
PO BOX 256, ALTON, IA 51003-0256
PO BOX 257, ALTON, IA 51003-0257
PO BOX 258, ALTON, IA 51003-0258
PO BOX 259, ALTON, IA 51003-0259
PO BOX 260, ALTON, IA 51003-0260
PO BOX 261, ALTON, IA 51003-0261
PO BOX 262, ALTON, IA 51003-0262
PO BOX 263, ALTON, IA 51003-0263
PO BOX 264, ALTON, IA 51003-0264
PO BOX 265, ALTON, IA 51003-0265
PO BOX 266, ALTON, IA 51003-0266
PO BOX 267, ALTON, IA 51003-0267
PO BOX 268, ALTON, IA 51003-0268
PO BOX 269, ALTON, IA 51003-0269
PO BOX 270, ALTON, IA 51003-0270
PO BOX 271, ALTON, IA 51003-0271
PO BOX 272, ALTON, IA 51003-0272
PO BOX 273, ALTON, IA 51003-0273
PO BOX 274, ALTON, IA 51003-0274
PO BOX 275, ALTON, IA 51003-0275
PO BOX 276, ALTON, IA 51003-0276
PO BOX 277, ALTON, IA 51003-0277
PO BOX 278, ALTON, IA 51003-0278
PO BOX 279, ALTON, IA 51003-0279
PO BOX 280, ALTON, IA 51003-0280
PO BOX 281, ALTON, IA 51003-0281
PO BOX 282, ALTON, IA 51003-0282
PO BOX 283, ALTON, IA 51003-0283
PO BOX 284, ALTON, IA 51003-0284
PO BOX 285, ALTON, IA 51003-0285
PO BOX 286, ALTON, IA 51003-0286
PO BOX 287, ALTON, IA 51003-0287
PO BOX 288, ALTON, IA 51003-0288
PO BOX 289, ALTON, IA 51003-0289
PO BOX 290, ALTON, IA 51003-0290
PO BOX 291, ALTON, IA 51003-0291
PO BOX 292, ALTON, IA 51003-0292
PO BOX 293, ALTON, IA 51003-0293
PO BOX 294, ALTON, IA 51003-0294
PO BOX 295, ALTON, IA 51003-0295
PO BOX 296, ALTON, IA 51003-0296
PO BOX 297, ALTON, IA 51003-0297
PO BOX 298, ALTON, IA 51003-0298
PO BOX 299, ALTON, IA 51003-0299
PO BOX 300, ALTON, IA 51003-0300
PO BOX 301, ALTON, IA 51003-0301
PO BOX 302, ALTON, IA 51003-0302
PO BOX 303, ALTON, IA 51003-0303
PO BOX 304, ALTON, IA 51003-0304
PO BOX 305, ALTON, IA 51003-0305
PO BOX 306, ALTON, IA 51003-0306
PO BOX 307, ALTON, IA 51003-0307
PO BOX 308, ALTON, IA 51003-0308
PO BOX 309, ALTON, IA 51003-0309
PO BOX 310, ALTON, IA 51003-0310
PO BOX 311, ALTON, IA 51003-0311
PO BOX 312, ALTON, IA 51003-0312
PO BOX 313, ALTON, IA 51003-0313
PO BOX 314, ALTON, IA 51003-0314
PO BOX 315, ALTON, IA 51003-0315
PO BOX 316, ALTON, IA 51003-0316
PO BOX 317, ALTON, IA 51003-0317
PO BOX 318, ALTON, IA 51003-0318
PO BOX 319, ALTON, IA 51003-0319
PO BOX 320, ALTON, IA 51003-0320
PO BOX 321, ALTON, IA 51003-0321
PO BOX 322, ALTON, IA 51003-0322
PO BOX 323, ALTON, IA 51003-0323
PO BOX 324, ALTON, IA 51003-0324
PO BOX 325, ALTON, IA 51003-0325
PO BOX 326, ALTON, IA 51003-0326
PO BOX 327, ALTON, IA 51003-0327
PO BOX 328, ALTON, IA 51003-0328
PO BOX 329, ALTON, IA 51003-0329
PO BOX 330, ALTON, IA 51003-0330
PO BOX 331, ALTON, IA 51003-0331
PO BOX 332, ALTON, IA 51003-0332
PO BOX 333, ALTON, IA 51003-0333
PO BOX 334, ALTON, IA 51003-0334
PO BOX 335, ALTON, IA 51003-0335
PO BOX 336, ALTON, IA 51003-0336
PO BOX 337, ALTON, IA 51003-0337
PO BOX 338, ALTON, IA 51003-0338
PO BOX 339, ALTON, IA 51003-0339
PO BOX 340, ALTON, IA 51003-0340
PO BOX 341, ALTON, IA 51003-0341
PO BOX 342, ALTON, IA 51003-0342
PO BOX 343, ALTON, IA 51003-0343
PO BOX 344, ALTON, IA 51003-0344
PO BOX 345, ALTON, IA 51003-0345
PO BOX 346, ALTON, IA 51003-0346
PO BOX 347, ALTON, IA 51003-0347
PO BOX 348, ALTON, IA 51003-0348
PO BOX 349, ALTON, IA 51003-0349
PO BOX 350, ALTON, IA 51003-0350
PO BOX 351, ALTON, IA 51003-0351
PO BOX 352, ALTON, IA 51003-0352
PO BOX 353, ALTON, IA 51003-0353
PO BOX 354, ALTON, IA 51003-0354
PO BOX 355, ALTON, IA 51003-0355
PO BOX 356, ALTON, IA 51003-0356
PO BOX 357, ALTON, IA 51003-0357
PO BOX 358, ALTON, IA 51003-0358
PO BOX 359, ALTON, IA 51003-0359
PO BOX 360, ALTON, IA 51003-0360
PO BOX 361, ALTON, IA 51003-0361
PO BOX 362, ALTON, IA 51003-0362
PO BOX 363, ALTON, IA 51003-0363
PO BOX 364, ALTON, IA 51003-0364
PO BOX 365, ALTON, IA 51003-0365
PO BOX 366, ALTON, IA 51003-0366
PO BOX 367, ALTON, IA 51003-0367
PO BOX 368, ALTON, IA 51003-0368
PO BOX 369, ALTON, IA 51003-0369
PO BOX 370, ALTON, IA 51003-0370
PO BOX 371, ALTON, IA 51003-0371
PO BOX 372, ALTON, IA 51003-0372
PO BOX 373, ALTON, IA 51003-0373
PO BOX 374, ALTON, IA 51003-0374
PO BOX 375, ALTON, IA 51003-0375
PO BOX 376, ALTON, IA 51003-0376
PO BOX 377, ALTON, IA 51003-0377
PO BOX 378, ALTON, IA 51003-0378
PO BOX 379, ALTON, IA 51003-0379
PO BOX 380, ALTON, IA 51003-0380
PO BOX 381, ALTON, IA 51003-0381
PO BOX 382, ALTON, IA 51003-0382
PO BOX 383, ALTON, IA 51003-0383
PO BOX 384, ALTON, IA 51003-0384
PO BOX 385, ALTON, IA 51003-0385
PO BOX 386, ALTON, IA 51003-0386
PO BOX 387, ALTON, IA 51003-0387
PO BOX 388, ALTON, IA 51003-0388
PO BOX 389, ALTON, IA 51003-0389
PO BOX 390, ALTON, IA 51003-0390
PO BOX 391, ALTON, IA 51003-0391
PO BOX 392, ALTON, IA 51003-0392
PO BOX 393, ALTON, IA 51003-0393
PO BOX 394, ALTON, IA 51003-0394
PO BOX 395, ALTON, IA 51003-0395
PO BOX 396, ALTON, IA 51003-0396
PO BOX 397, ALTON, IA 51003-0397
PO BOX 398, ALTON, IA 51003-0398
PO BOX 399, ALTON, IA 51003-0399
PO BOX 400, ALTON, IA 51003-0400
PO BOX 401, ALTON, IA 51003-0401
PO BOX 402, ALTON, IA 51003-0402
PO BOX 403, ALTON, IA 51003-0403
PO BOX 404, ALTON, IA 51003-0404
PO BOX 405, ALTON, IA 51003-0405
PO BOX 406, ALTON, IA 51003-0406
PO BOX 407, ALTON, IA 51003-0407
PO BOX 408, ALTON, IA 51003-0408
PO BOX 409, ALTON, IA 51003-0409
PO BOX 410, ALTON, IA 51003-0410
PO BOX 411, ALTON, IA 51003-0411
PO BOX 412, ALTON, IA 51003-0412
PO BOX 413, ALTON, IA 51003-0413
PO BOX 414, ALTON, IA 51003-0414
PO BOX 415, ALTON, IA 51003-0415
PO BOX 416, ALTON, IA 51003-0416
PO BOX 417, ALTON, IA 51003-0417
PO BOX 418, ALTON, IA 51003-0418
PO BOX 419, ALTON, IA 51003-0419
PO BOX 420, ALTON, IA 51003-0420
PO BOX 421, ALTON, IA 51003-0421
PO BOX 422, ALTON, IA 51003-0422
PO BOX 423, ALTON, IA 51003-0423
PO BOX 424, ALTON, IA 51003-0424
PO BOX 425, ALTON, IA 51003-0425
PO BOX 426, ALTON, IA 51003-0426
PO BOX 427, ALTON, IA 51003-0427
PO BOX 428, ALTON, IA 51003-0428
PO BOX 429, ALTON, IA 51003-0429
PO BOX 430, ALTON, IA 51003-0430
PO BOX 431, ALTON, IA 51003-0431
PO BOX 432, ALTON, IA 51003-0432
PO BOX 433, ALTON, IA 51003-0433
PO BOX 434, ALTON, IA 51003-0434
PO BOX 435, ALTON, IA 51003-0435
PO BOX 436, ALTON, IA 51003-0436
PO BOX 437, ALTON, IA 51003-0437
PO BOX 438, ALTON, IA 51003-0438
PO BOX 439, ALTON, IA 51003-0439
PO BOX 440, ALTON, IA 51003-0440
PO BOX 441, ALTON, IA 51003-0441
PO BOX 442, ALTON, IA 51003-0442
PO BOX 443, ALTON, IA 51003-0443
PO BOX 444, ALTON, IA 51003-0444
PO BOX 445, ALTON, IA 51003-0445
PO BOX 446, ALTON, IA 51003-0446
PO BOX 447, ALTON, IA 51003-0447
PO BOX 448, ALTON, IA 51003-0448
PO BOX 449, ALTON, IA 51003-0449
PO BOX 450, ALTON, IA 51003-0450
PO BOX 451, ALTON, IA 51003-0451
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