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 241, DALLAS CENTER, IA 50063-0241
PO BOX 242, DALLAS CENTER, IA 50063-0242
PO BOX 243, DALLAS CENTER, IA 50063-0243
PO BOX 244, DALLAS CENTER, IA 50063-0244
PO BOX 245, DALLAS CENTER, IA 50063-0245
PO BOX 246, DALLAS CENTER, IA 50063-0246
PO BOX 247, DALLAS CENTER, IA 50063-0247
PO BOX 248, DALLAS CENTER, IA 50063-0248
PO BOX 249, DALLAS CENTER, IA 50063-0249
PO BOX 250, DALLAS CENTER, IA 50063-0250
PO BOX 251, DALLAS CENTER, IA 50063-0251
PO BOX 252, DALLAS CENTER, IA 50063-0252
PO BOX 253, DALLAS CENTER, IA 50063-0253
PO BOX 254, DALLAS CENTER, IA 50063-0254
PO BOX 255, DALLAS CENTER, IA 50063-0255
PO BOX 256, DALLAS CENTER, IA 50063-0256
PO BOX 257, DALLAS CENTER, IA 50063-0257
PO BOX 258, DALLAS CENTER, IA 50063-0258
PO BOX 259, DALLAS CENTER, IA 50063-0259
PO BOX 260, DALLAS CENTER, IA 50063-0260
PO BOX 261, DALLAS CENTER, IA 50063-0261
PO BOX 262, DALLAS CENTER, IA 50063-0262
PO BOX 263, DALLAS CENTER, IA 50063-0263
PO BOX 264, DALLAS CENTER, IA 50063-0264
PO BOX 265, DALLAS CENTER, IA 50063-0265
PO BOX 266, DALLAS CENTER, IA 50063-0266
PO BOX 267, DALLAS CENTER, IA 50063-0267
PO BOX 268, DALLAS CENTER, IA 50063-0268
PO BOX 269, DALLAS CENTER, IA 50063-0269
PO BOX 270, DALLAS CENTER, IA 50063-0270
PO BOX 271, DALLAS CENTER, IA 50063-0271
PO BOX 272, DALLAS CENTER, IA 50063-0272
PO BOX 273, DALLAS CENTER, IA 50063-0273
PO BOX 274, DALLAS CENTER, IA 50063-0274
PO BOX 275, DALLAS CENTER, IA 50063-0275
PO BOX 276, DALLAS CENTER, IA 50063-0276
PO BOX 277, DALLAS CENTER, IA 50063-0277
PO BOX 278, DALLAS CENTER, IA 50063-0278
PO BOX 279, DALLAS CENTER, IA 50063-0279
PO BOX 280, DALLAS CENTER, IA 50063-0280
PO BOX 281, DALLAS CENTER, IA 50063-0281
PO BOX 282, DALLAS CENTER, IA 50063-0282
PO BOX 283, DALLAS CENTER, IA 50063-0283
PO BOX 284, DALLAS CENTER, IA 50063-0284
PO BOX 285, DALLAS CENTER, IA 50063-0285
PO BOX 286, DALLAS CENTER, IA 50063-0286
PO BOX 287, DALLAS CENTER, IA 50063-0287
PO BOX 288, DALLAS CENTER, IA 50063-0288
PO BOX 289, DALLAS CENTER, IA 50063-0289
PO BOX 290, DALLAS CENTER, IA 50063-0290
PO BOX 291, DALLAS CENTER, IA 50063-0291
PO BOX 292, DALLAS CENTER, IA 50063-0292
PO BOX 293, DALLAS CENTER, IA 50063-0293
PO BOX 294, DALLAS CENTER, IA 50063-0294
PO BOX 295, DALLAS CENTER, IA 50063-0295
PO BOX 296, DALLAS CENTER, IA 50063-0296
PO BOX 297, DALLAS CENTER, IA 50063-0297
PO BOX 298, DALLAS CENTER, IA 50063-0298
PO BOX 299, DALLAS CENTER, IA 50063-0299
PO BOX 300, DALLAS CENTER, IA 50063-0300
PO BOX 301, DALLAS CENTER, IA 50063-0301
PO BOX 302, DALLAS CENTER, IA 50063-0302
PO BOX 303, DALLAS CENTER, IA 50063-0303
PO BOX 304, DALLAS CENTER, IA 50063-0304
PO BOX 305, DALLAS CENTER, IA 50063-0305
PO BOX 306, DALLAS CENTER, IA 50063-0306
PO BOX 307, DALLAS CENTER, IA 50063-0307
PO BOX 308, DALLAS CENTER, IA 50063-0308
PO BOX 309, DALLAS CENTER, IA 50063-0309
PO BOX 310, DALLAS CENTER, IA 50063-0310
PO BOX 311, DALLAS CENTER, IA 50063-0311
PO BOX 312, DALLAS CENTER, IA 50063-0312
PO BOX 313, DALLAS CENTER, IA 50063-0313
PO BOX 314, DALLAS CENTER, IA 50063-0314
PO BOX 315, DALLAS CENTER, IA 50063-0315
PO BOX 316, DALLAS CENTER, IA 50063-0316
PO BOX 317, DALLAS CENTER, IA 50063-0317
PO BOX 318, DALLAS CENTER, IA 50063-0318
PO BOX 319, DALLAS CENTER, IA 50063-0319
PO BOX 320, DALLAS CENTER, IA 50063-0320
PO BOX 321, DALLAS CENTER, IA 50063-0321
PO BOX 322, DALLAS CENTER, IA 50063-0322
PO BOX 323, DALLAS CENTER, IA 50063-0323
PO BOX 324, DALLAS CENTER, IA 50063-0324
PO BOX 325, DALLAS CENTER, IA 50063-0325
PO BOX 326, DALLAS CENTER, IA 50063-0326
PO BOX 327, DALLAS CENTER, IA 50063-0327
PO BOX 328, DALLAS CENTER, IA 50063-0328
PO BOX 329, DALLAS CENTER, IA 50063-0329
PO BOX 330, DALLAS CENTER, IA 50063-0330
PO BOX 331, DALLAS CENTER, IA 50063-0331
PO BOX 332, DALLAS CENTER, IA 50063-0332
PO BOX 333, DALLAS CENTER, IA 50063-0333
PO BOX 334, DALLAS CENTER, IA 50063-0334
PO BOX 335, DALLAS CENTER, IA 50063-0335
PO BOX 336, DALLAS CENTER, IA 50063-0336
PO BOX 337, DALLAS CENTER, IA 50063-0337
PO BOX 338, DALLAS CENTER, IA 50063-0338
PO BOX 339, DALLAS CENTER, IA 50063-0339
PO BOX 340, DALLAS CENTER, IA 50063-0340
PO BOX 341, DALLAS CENTER, IA 50063-0341
PO BOX 342, DALLAS CENTER, IA 50063-0342
PO BOX 343, DALLAS CENTER, IA 50063-0343
PO BOX 344, DALLAS CENTER, IA 50063-0344
PO BOX 345, DALLAS CENTER, IA 50063-0345
PO BOX 346, DALLAS CENTER, IA 50063-0346
PO BOX 347, DALLAS CENTER, IA 50063-0347
PO BOX 348, DALLAS CENTER, IA 50063-0348
PO BOX 349, DALLAS CENTER, IA 50063-0349
PO BOX 350, DALLAS CENTER, IA 50063-0350
PO BOX 351, DALLAS CENTER, IA 50063-0351
PO BOX 352, DALLAS CENTER, IA 50063-0352
PO BOX 353, DALLAS CENTER, IA 50063-0353
PO BOX 354, DALLAS CENTER, IA 50063-0354
PO BOX 355, DALLAS CENTER, IA 50063-0355
PO BOX 356, DALLAS CENTER, IA 50063-0356
PO BOX 357, DALLAS CENTER, IA 50063-0357
PO BOX 358, DALLAS CENTER, IA 50063-0358
PO BOX 359, DALLAS CENTER, IA 50063-0359
PO BOX 360, DALLAS CENTER, IA 50063-0360
PO BOX 361, DALLAS CENTER, IA 50063-0361
PO BOX 362, DALLAS CENTER, IA 50063-0362
PO BOX 363, DALLAS CENTER, IA 50063-0363
PO BOX 364, DALLAS CENTER, IA 50063-0364
PO BOX 365, DALLAS CENTER, IA 50063-0365
PO BOX 366, DALLAS CENTER, IA 50063-0366
PO BOX 367, DALLAS CENTER, IA 50063-0367
PO BOX 368, DALLAS CENTER, IA 50063-0368
PO BOX 369, DALLAS CENTER, IA 50063-0369
PO BOX 370, DALLAS CENTER, IA 50063-0370
PO BOX 371, DALLAS CENTER, IA 50063-0371
PO BOX 372, DALLAS CENTER, IA 50063-0372
PO BOX 373, DALLAS CENTER, IA 50063-0373
PO BOX 374, DALLAS CENTER, IA 50063-0374
PO BOX 375, DALLAS CENTER, IA 50063-0375
PO BOX 376, DALLAS CENTER, IA 50063-0376
PO BOX 377, DALLAS CENTER, IA 50063-0377
PO BOX 378, DALLAS CENTER, IA 50063-0378
PO BOX 379, DALLAS CENTER, IA 50063-0379
PO BOX 380, DALLAS CENTER, IA 50063-0380
PO BOX 381, DALLAS CENTER, IA 50063-0381
PO BOX 382, DALLAS CENTER, IA 50063-0382
PO BOX 383, DALLAS CENTER, IA 50063-0383
PO BOX 384, DALLAS CENTER, IA 50063-0384
PO BOX 385, DALLAS CENTER, IA 50063-0385
PO BOX 386, DALLAS CENTER, IA 50063-0386
PO BOX 387, DALLAS CENTER, IA 50063-0387
PO BOX 388, DALLAS CENTER, IA 50063-0388
PO BOX 389, DALLAS CENTER, IA 50063-0389
PO BOX 390, DALLAS CENTER, IA 50063-0390
PO BOX 391, DALLAS CENTER, IA 50063-0391
PO BOX 392, DALLAS CENTER, IA 50063-0392
PO BOX 393, DALLAS CENTER, IA 50063-0393
PO BOX 394, DALLAS CENTER, IA 50063-0394
PO BOX 395, DALLAS CENTER, IA 50063-0395
PO BOX 396, DALLAS CENTER, IA 50063-0396
PO BOX 397, DALLAS CENTER, IA 50063-0397
PO BOX 398, DALLAS CENTER, IA 50063-0398
PO BOX 399, DALLAS CENTER, IA 50063-0399
PO BOX 400, DALLAS CENTER, IA 50063-0400
PO BOX 401, DALLAS CENTER, IA 50063-0401
PO BOX 402, DALLAS CENTER, IA 50063-0402
PO BOX 403, DALLAS CENTER, IA 50063-0403
PO BOX 404, DALLAS CENTER, IA 50063-0404
PO BOX 405, DALLAS CENTER, IA 50063-0405
PO BOX 406, DALLAS CENTER, IA 50063-0406
PO BOX 407, DALLAS CENTER, IA 50063-0407
PO BOX 408, DALLAS CENTER, IA 50063-0408
PO BOX 409, DALLAS CENTER, IA 50063-0409
PO BOX 410, DALLAS CENTER, IA 50063-0410
PO BOX 411, DALLAS CENTER, IA 50063-0411
PO BOX 412, DALLAS CENTER, IA 50063-0412
PO BOX 413, DALLAS CENTER, IA 50063-0413
PO BOX 414, DALLAS CENTER, IA 50063-0414
PO BOX 415, DALLAS CENTER, IA 50063-0415
PO BOX 416, DALLAS CENTER, IA 50063-0416
PO BOX 417, DALLAS CENTER, IA 50063-0417
PO BOX 418, DALLAS CENTER, IA 50063-0418
PO BOX 419, DALLAS CENTER, IA 50063-0419
PO BOX 420, DALLAS CENTER, IA 50063-0420
PO BOX 421, DALLAS CENTER, IA 50063-0421
PO BOX 422, DALLAS CENTER, IA 50063-0422
PO BOX 423, DALLAS CENTER, IA 50063-0423
PO BOX 424, DALLAS CENTER, IA 50063-0424
PO BOX 425, DALLAS CENTER, IA 50063-0425
PO BOX 426, DALLAS CENTER, IA 50063-0426
PO BOX 427, DALLAS CENTER, IA 50063-0427
PO BOX 428, DALLAS CENTER, IA 50063-0428
PO BOX 429, DALLAS CENTER, IA 50063-0429
PO BOX 430, DALLAS CENTER, IA 50063-0430
PO BOX 431, DALLAS CENTER, IA 50063-0431
PO BOX 432, DALLAS CENTER, IA 50063-0432
PO BOX 433, DALLAS CENTER, IA 50063-0433
PO BOX 434, DALLAS CENTER, IA 50063-0434
PO BOX 435, DALLAS CENTER, IA 50063-0435
PO BOX 436, DALLAS CENTER, IA 50063-0436
PO BOX 437, DALLAS CENTER, IA 50063-0437
PO BOX 438, DALLAS CENTER, IA 50063-0438
PO BOX 439, DALLAS CENTER, IA 50063-0439
PO BOX 440, DALLAS CENTER, IA 50063-0440
PO BOX 441, DALLAS CENTER, IA 50063-0441
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