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 231, CARLISLE, IA 50047-0231
PO BOX 232, CARLISLE, IA 50047-0232
PO BOX 233, CARLISLE, IA 50047-0233
PO BOX 234, CARLISLE, IA 50047-0234
PO BOX 235, CARLISLE, IA 50047-0235
PO BOX 236, CARLISLE, IA 50047-0236
PO BOX 237, CARLISLE, IA 50047-0237
PO BOX 238, CARLISLE, IA 50047-0238
PO BOX 239, CARLISLE, IA 50047-0239
PO BOX 240, CARLISLE, IA 50047-0240
PO BOX 241, CARLISLE, IA 50047-0241
PO BOX 242, CARLISLE, IA 50047-0242
PO BOX 243, CARLISLE, IA 50047-0243
PO BOX 244, CARLISLE, IA 50047-0244
PO BOX 245, CARLISLE, IA 50047-0245
PO BOX 246, CARLISLE, IA 50047-0246
PO BOX 247, CARLISLE, IA 50047-0247
PO BOX 248, CARLISLE, IA 50047-0248
PO BOX 249, CARLISLE, IA 50047-0249
PO BOX 250, CARLISLE, IA 50047-0250
PO BOX 251, CARLISLE, IA 50047-0251
PO BOX 252, CARLISLE, IA 50047-0252
PO BOX 253, CARLISLE, IA 50047-0253
PO BOX 254, CARLISLE, IA 50047-0254
PO BOX 255, CARLISLE, IA 50047-0255
PO BOX 256, CARLISLE, IA 50047-0256
PO BOX 257, CARLISLE, IA 50047-0257
PO BOX 258, CARLISLE, IA 50047-0258
PO BOX 259, CARLISLE, IA 50047-0259
PO BOX 260, CARLISLE, IA 50047-0260
PO BOX 261, CARLISLE, IA 50047-0261
PO BOX 262, CARLISLE, IA 50047-0262
PO BOX 263, CARLISLE, IA 50047-0263
PO BOX 264, CARLISLE, IA 50047-0264
PO BOX 265, CARLISLE, IA 50047-0265
PO BOX 266, CARLISLE, IA 50047-0266
PO BOX 267, CARLISLE, IA 50047-0267
PO BOX 268, CARLISLE, IA 50047-0268
PO BOX 269, CARLISLE, IA 50047-0269
PO BOX 270, CARLISLE, IA 50047-0270
PO BOX 271, CARLISLE, IA 50047-0271
PO BOX 272, CARLISLE, IA 50047-0272
PO BOX 273, CARLISLE, IA 50047-0273
PO BOX 274, CARLISLE, IA 50047-0274
PO BOX 275, CARLISLE, IA 50047-0275
PO BOX 276, CARLISLE, IA 50047-0276
PO BOX 277, CARLISLE, IA 50047-0277
PO BOX 278, CARLISLE, IA 50047-0278
PO BOX 279, CARLISLE, IA 50047-0279
PO BOX 280, CARLISLE, IA 50047-0280
PO BOX 281, CARLISLE, IA 50047-0281
PO BOX 282, CARLISLE, IA 50047-0282
PO BOX 283, CARLISLE, IA 50047-0283
PO BOX 284, CARLISLE, IA 50047-0284
PO BOX 285, CARLISLE, IA 50047-0285
PO BOX 286, CARLISLE, IA 50047-0286
PO BOX 287, CARLISLE, IA 50047-0287
PO BOX 288, CARLISLE, IA 50047-0288
PO BOX 289, CARLISLE, IA 50047-0289
PO BOX 290, CARLISLE, IA 50047-0290
PO BOX 291, CARLISLE, IA 50047-0291
PO BOX 292, CARLISLE, IA 50047-0292
PO BOX 293, CARLISLE, IA 50047-0293
PO BOX 294, CARLISLE, IA 50047-0294
PO BOX 295, CARLISLE, IA 50047-0295
PO BOX 296, CARLISLE, IA 50047-0296
PO BOX 297, CARLISLE, IA 50047-0297
PO BOX 298, CARLISLE, IA 50047-0298
PO BOX 299, CARLISLE, IA 50047-0299
PO BOX 300, CARLISLE, IA 50047-0300
PO BOX 301, CARLISLE, IA 50047-0301
PO BOX 302, CARLISLE, IA 50047-0302
PO BOX 303, CARLISLE, IA 50047-0303
PO BOX 304, CARLISLE, IA 50047-0304
PO BOX 305, CARLISLE, IA 50047-0305
PO BOX 306, CARLISLE, IA 50047-0306
PO BOX 307, CARLISLE, IA 50047-0307
PO BOX 308, CARLISLE, IA 50047-0308
PO BOX 309, CARLISLE, IA 50047-0309
PO BOX 310, CARLISLE, IA 50047-0310
PO BOX 311, CARLISLE, IA 50047-0311
PO BOX 312, CARLISLE, IA 50047-0312
PO BOX 313, CARLISLE, IA 50047-0313
PO BOX 314, CARLISLE, IA 50047-0314
PO BOX 315, CARLISLE, IA 50047-0315
PO BOX 316, CARLISLE, IA 50047-0316
PO BOX 317, CARLISLE, IA 50047-0317
PO BOX 318, CARLISLE, IA 50047-0318
PO BOX 319, CARLISLE, IA 50047-0319
PO BOX 320, CARLISLE, IA 50047-0320
PO BOX 321, CARLISLE, IA 50047-0321
PO BOX 322, CARLISLE, IA 50047-0322
PO BOX 323, CARLISLE, IA 50047-0323
PO BOX 324, CARLISLE, IA 50047-0324
PO BOX 325, CARLISLE, IA 50047-0325
PO BOX 326, CARLISLE, IA 50047-0326
PO BOX 327, CARLISLE, IA 50047-0327
PO BOX 328, CARLISLE, IA 50047-0328
PO BOX 329, CARLISLE, IA 50047-0329
PO BOX 330, CARLISLE, IA 50047-0330
PO BOX 331, CARLISLE, IA 50047-0331
PO BOX 332, CARLISLE, IA 50047-0332
PO BOX 333, CARLISLE, IA 50047-0333
PO BOX 334, CARLISLE, IA 50047-0334
PO BOX 335, CARLISLE, IA 50047-0335
PO BOX 336, CARLISLE, IA 50047-0336
PO BOX 337, CARLISLE, IA 50047-0337
PO BOX 338, CARLISLE, IA 50047-0338
PO BOX 339, CARLISLE, IA 50047-0339
PO BOX 340, CARLISLE, IA 50047-0340
PO BOX 341, CARLISLE, IA 50047-0341
PO BOX 342, CARLISLE, IA 50047-0342
PO BOX 343, CARLISLE, IA 50047-0343
PO BOX 344, CARLISLE, IA 50047-0344
PO BOX 345, CARLISLE, IA 50047-0345
PO BOX 346, CARLISLE, IA 50047-0346
PO BOX 347, CARLISLE, IA 50047-0347
PO BOX 348, CARLISLE, IA 50047-0348
PO BOX 349, CARLISLE, IA 50047-0349
PO BOX 350, CARLISLE, IA 50047-0350
PO BOX 351, CARLISLE, IA 50047-0351
PO BOX 352, CARLISLE, IA 50047-0352
PO BOX 353, CARLISLE, IA 50047-0353
PO BOX 354, CARLISLE, IA 50047-0354
PO BOX 355, CARLISLE, IA 50047-0355
PO BOX 356, CARLISLE, IA 50047-0356
PO BOX 357, CARLISLE, IA 50047-0357
PO BOX 358, CARLISLE, IA 50047-0358
PO BOX 359, CARLISLE, IA 50047-0359
PO BOX 360, CARLISLE, IA 50047-0360
PO BOX 361, CARLISLE, IA 50047-0361
PO BOX 362, CARLISLE, IA 50047-0362
PO BOX 363, CARLISLE, IA 50047-0363
PO BOX 364, CARLISLE, IA 50047-0364
PO BOX 365, CARLISLE, IA 50047-0365
PO BOX 366, CARLISLE, IA 50047-0366
PO BOX 367, CARLISLE, IA 50047-0367
PO BOX 368, CARLISLE, IA 50047-0368
PO BOX 369, CARLISLE, IA 50047-0369
PO BOX 370, CARLISLE, IA 50047-0370
PO BOX 371, CARLISLE, IA 50047-0371
PO BOX 372, CARLISLE, IA 50047-0372
PO BOX 373, CARLISLE, IA 50047-0373
PO BOX 374, CARLISLE, IA 50047-0374
PO BOX 375, CARLISLE, IA 50047-0375
PO BOX 376, CARLISLE, IA 50047-0376
PO BOX 377, CARLISLE, IA 50047-0377
PO BOX 378, CARLISLE, IA 50047-0378
PO BOX 379, CARLISLE, IA 50047-0379
PO BOX 380, CARLISLE, IA 50047-0380
PO BOX 381, CARLISLE, IA 50047-0381
PO BOX 382, CARLISLE, IA 50047-0382
PO BOX 383, CARLISLE, IA 50047-0383
PO BOX 384, CARLISLE, IA 50047-0384
PO BOX 385, CARLISLE, IA 50047-0385
PO BOX 386, CARLISLE, IA 50047-0386
PO BOX 387, CARLISLE, IA 50047-0387
PO BOX 388, CARLISLE, IA 50047-0388
PO BOX 389, CARLISLE, IA 50047-0389
PO BOX 390, CARLISLE, IA 50047-0390
PO BOX 391, CARLISLE, IA 50047-0391
PO BOX 392, CARLISLE, IA 50047-0392
PO BOX 393, CARLISLE, IA 50047-0393
PO BOX 394, CARLISLE, IA 50047-0394
PO BOX 395, CARLISLE, IA 50047-0395
PO BOX 396, CARLISLE, IA 50047-0396
PO BOX 397, CARLISLE, IA 50047-0397
PO BOX 398, CARLISLE, IA 50047-0398
PO BOX 399, CARLISLE, IA 50047-0399
PO BOX 400, CARLISLE, IA 50047-0400
PO BOX 401, CARLISLE, IA 50047-0401
PO BOX 402, CARLISLE, IA 50047-0402
PO BOX 403, CARLISLE, IA 50047-0403
PO BOX 404, CARLISLE, IA 50047-0404
PO BOX 405, CARLISLE, IA 50047-0405
PO BOX 406, CARLISLE, IA 50047-0406
PO BOX 407, CARLISLE, IA 50047-0407
PO BOX 408, CARLISLE, IA 50047-0408
PO BOX 409, CARLISLE, IA 50047-0409
PO BOX 410, CARLISLE, IA 50047-0410
PO BOX 411, CARLISLE, IA 50047-0411
PO BOX 412, CARLISLE, IA 50047-0412
PO BOX 413, CARLISLE, IA 50047-0413
PO BOX 414, CARLISLE, IA 50047-0414
PO BOX 415, CARLISLE, IA 50047-0415
PO BOX 416, CARLISLE, IA 50047-0416
PO BOX 417, CARLISLE, IA 50047-0417
PO BOX 418, CARLISLE, IA 50047-0418
PO BOX 419, CARLISLE, IA 50047-0419
PO BOX 420, CARLISLE, IA 50047-0420
PO BOX 421, CARLISLE, IA 50047-0421
PO BOX 422, CARLISLE, IA 50047-0422
PO BOX 423, CARLISLE, IA 50047-0423
PO BOX 424, CARLISLE, IA 50047-0424
PO BOX 425, CARLISLE, IA 50047-0425
PO BOX 426, CARLISLE, IA 50047-0426
PO BOX 427, CARLISLE, IA 50047-0427
PO BOX 428, CARLISLE, IA 50047-0428
PO BOX 429, CARLISLE, IA 50047-0429
PO BOX 430, CARLISLE, IA 50047-0430
PO BOX 431, CARLISLE, IA 50047-0431
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