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, CENTRAL CITY, IA 52214-0241
PO BOX 242, CENTRAL CITY, IA 52214-0242
PO BOX 243, CENTRAL CITY, IA 52214-0243
PO BOX 244, CENTRAL CITY, IA 52214-0244
PO BOX 245, CENTRAL CITY, IA 52214-0245
PO BOX 246, CENTRAL CITY, IA 52214-0246
PO BOX 247, CENTRAL CITY, IA 52214-0247
PO BOX 248, CENTRAL CITY, IA 52214-0248
PO BOX 249, CENTRAL CITY, IA 52214-0249
PO BOX 250, CENTRAL CITY, IA 52214-0250
PO BOX 251, CENTRAL CITY, IA 52214-0251
PO BOX 252, CENTRAL CITY, IA 52214-0252
PO BOX 253, CENTRAL CITY, IA 52214-0253
PO BOX 254, CENTRAL CITY, IA 52214-0254
PO BOX 255, CENTRAL CITY, IA 52214-0255
PO BOX 256, CENTRAL CITY, IA 52214-0256
PO BOX 257, CENTRAL CITY, IA 52214-0257
PO BOX 258, CENTRAL CITY, IA 52214-0258
PO BOX 259, CENTRAL CITY, IA 52214-0259
PO BOX 260, CENTRAL CITY, IA 52214-0260
PO BOX 261, CENTRAL CITY, IA 52214-0261
PO BOX 262, CENTRAL CITY, IA 52214-0262
PO BOX 263, CENTRAL CITY, IA 52214-0263
PO BOX 264, CENTRAL CITY, IA 52214-0264
PO BOX 265, CENTRAL CITY, IA 52214-0265
PO BOX 266, CENTRAL CITY, IA 52214-0266
PO BOX 267, CENTRAL CITY, IA 52214-0267
PO BOX 268, CENTRAL CITY, IA 52214-0268
PO BOX 269, CENTRAL CITY, IA 52214-0269
PO BOX 270, CENTRAL CITY, IA 52214-0270
PO BOX 271, CENTRAL CITY, IA 52214-0271
PO BOX 272, CENTRAL CITY, IA 52214-0272
PO BOX 273, CENTRAL CITY, IA 52214-0273
PO BOX 274, CENTRAL CITY, IA 52214-0274
PO BOX 275, CENTRAL CITY, IA 52214-0275
PO BOX 276, CENTRAL CITY, IA 52214-0276
PO BOX 277, CENTRAL CITY, IA 52214-0277
PO BOX 278, CENTRAL CITY, IA 52214-0278
PO BOX 279, CENTRAL CITY, IA 52214-0279
PO BOX 280, CENTRAL CITY, IA 52214-0280
PO BOX 281, CENTRAL CITY, IA 52214-0281
PO BOX 282, CENTRAL CITY, IA 52214-0282
PO BOX 283, CENTRAL CITY, IA 52214-0283
PO BOX 284, CENTRAL CITY, IA 52214-0284
PO BOX 285, CENTRAL CITY, IA 52214-0285
PO BOX 286, CENTRAL CITY, IA 52214-0286
PO BOX 287, CENTRAL CITY, IA 52214-0287
PO BOX 288, CENTRAL CITY, IA 52214-0288
PO BOX 289, CENTRAL CITY, IA 52214-0289
PO BOX 290, CENTRAL CITY, IA 52214-0290
PO BOX 291, CENTRAL CITY, IA 52214-0291
PO BOX 292, CENTRAL CITY, IA 52214-0292
PO BOX 293, CENTRAL CITY, IA 52214-0293
PO BOX 294, CENTRAL CITY, IA 52214-0294
PO BOX 295, CENTRAL CITY, IA 52214-0295
PO BOX 296, CENTRAL CITY, IA 52214-0296
PO BOX 297, CENTRAL CITY, IA 52214-0297
PO BOX 298, CENTRAL CITY, IA 52214-0298
PO BOX 299, CENTRAL CITY, IA 52214-0299
PO BOX 300, CENTRAL CITY, IA 52214-0300
PO BOX 301, CENTRAL CITY, IA 52214-0301
PO BOX 302, CENTRAL CITY, IA 52214-0302
PO BOX 303, CENTRAL CITY, IA 52214-0303
PO BOX 304, CENTRAL CITY, IA 52214-0304
PO BOX 305, CENTRAL CITY, IA 52214-0305
PO BOX 306, CENTRAL CITY, IA 52214-0306
PO BOX 307, CENTRAL CITY, IA 52214-0307
PO BOX 308, CENTRAL CITY, IA 52214-0308
PO BOX 309, CENTRAL CITY, IA 52214-0309
PO BOX 310, CENTRAL CITY, IA 52214-0310
PO BOX 311, CENTRAL CITY, IA 52214-0311
PO BOX 312, CENTRAL CITY, IA 52214-0312
PO BOX 313, CENTRAL CITY, IA 52214-0313
PO BOX 314, CENTRAL CITY, IA 52214-0314
PO BOX 315, CENTRAL CITY, IA 52214-0315
PO BOX 316, CENTRAL CITY, IA 52214-0316
PO BOX 317, CENTRAL CITY, IA 52214-0317
PO BOX 318, CENTRAL CITY, IA 52214-0318
PO BOX 319, CENTRAL CITY, IA 52214-0319
PO BOX 320, CENTRAL CITY, IA 52214-0320
PO BOX 321, CENTRAL CITY, IA 52214-0321
PO BOX 322, CENTRAL CITY, IA 52214-0322
PO BOX 323, CENTRAL CITY, IA 52214-0323
PO BOX 324, CENTRAL CITY, IA 52214-0324
PO BOX 325, CENTRAL CITY, IA 52214-0325
PO BOX 326, CENTRAL CITY, IA 52214-0326
PO BOX 327, CENTRAL CITY, IA 52214-0327
PO BOX 328, CENTRAL CITY, IA 52214-0328
PO BOX 329, CENTRAL CITY, IA 52214-0329
PO BOX 330, CENTRAL CITY, IA 52214-0330
PO BOX 331, CENTRAL CITY, IA 52214-0331
PO BOX 332, CENTRAL CITY, IA 52214-0332
PO BOX 333, CENTRAL CITY, IA 52214-0333
PO BOX 334, CENTRAL CITY, IA 52214-0334
PO BOX 335, CENTRAL CITY, IA 52214-0335
PO BOX 336, CENTRAL CITY, IA 52214-0336
PO BOX 337, CENTRAL CITY, IA 52214-0337
PO BOX 338, CENTRAL CITY, IA 52214-0338
PO BOX 339, CENTRAL CITY, IA 52214-0339
PO BOX 340, CENTRAL CITY, IA 52214-0340
PO BOX 341, CENTRAL CITY, IA 52214-0341
PO BOX 342, CENTRAL CITY, IA 52214-0342
PO BOX 343, CENTRAL CITY, IA 52214-0343
PO BOX 344, CENTRAL CITY, IA 52214-0344
PO BOX 345, CENTRAL CITY, IA 52214-0345
PO BOX 346, CENTRAL CITY, IA 52214-0346
PO BOX 347, CENTRAL CITY, IA 52214-0347
PO BOX 348, CENTRAL CITY, IA 52214-0348
PO BOX 349, CENTRAL CITY, IA 52214-0349
PO BOX 350, CENTRAL CITY, IA 52214-0350
PO BOX 351, CENTRAL CITY, IA 52214-0351
PO BOX 352, CENTRAL CITY, IA 52214-0352
PO BOX 353, CENTRAL CITY, IA 52214-0353
PO BOX 354, CENTRAL CITY, IA 52214-0354
PO BOX 355, CENTRAL CITY, IA 52214-0355
PO BOX 356, CENTRAL CITY, IA 52214-0356
PO BOX 357, CENTRAL CITY, IA 52214-0357
PO BOX 358, CENTRAL CITY, IA 52214-0358
PO BOX 359, CENTRAL CITY, IA 52214-0359
PO BOX 360, CENTRAL CITY, IA 52214-0360
PO BOX 361, CENTRAL CITY, IA 52214-0361
PO BOX 362, CENTRAL CITY, IA 52214-0362
PO BOX 363, CENTRAL CITY, IA 52214-0363
PO BOX 364, CENTRAL CITY, IA 52214-0364
PO BOX 365, CENTRAL CITY, IA 52214-0365
PO BOX 366, CENTRAL CITY, IA 52214-0366
PO BOX 367, CENTRAL CITY, IA 52214-0367
PO BOX 368, CENTRAL CITY, IA 52214-0368
PO BOX 369, CENTRAL CITY, IA 52214-0369
PO BOX 370, CENTRAL CITY, IA 52214-0370
PO BOX 371, CENTRAL CITY, IA 52214-0371
PO BOX 372, CENTRAL CITY, IA 52214-0372
PO BOX 373, CENTRAL CITY, IA 52214-0373
PO BOX 374, CENTRAL CITY, IA 52214-0374
PO BOX 375, CENTRAL CITY, IA 52214-0375
PO BOX 376, CENTRAL CITY, IA 52214-0376
PO BOX 377, CENTRAL CITY, IA 52214-0377
PO BOX 378, CENTRAL CITY, IA 52214-0378
PO BOX 379, CENTRAL CITY, IA 52214-0379
PO BOX 380, CENTRAL CITY, IA 52214-0380
PO BOX 381, CENTRAL CITY, IA 52214-0381
PO BOX 382, CENTRAL CITY, IA 52214-0382
PO BOX 383, CENTRAL CITY, IA 52214-0383
PO BOX 384, CENTRAL CITY, IA 52214-0384
PO BOX 385, CENTRAL CITY, IA 52214-0385
PO BOX 386, CENTRAL CITY, IA 52214-0386
PO BOX 387, CENTRAL CITY, IA 52214-0387
PO BOX 388, CENTRAL CITY, IA 52214-0388
PO BOX 389, CENTRAL CITY, IA 52214-0389
PO BOX 390, CENTRAL CITY, IA 52214-0390
PO BOX 391, CENTRAL CITY, IA 52214-0391
PO BOX 392, CENTRAL CITY, IA 52214-0392
PO BOX 393, CENTRAL CITY, IA 52214-0393
PO BOX 394, CENTRAL CITY, IA 52214-0394
PO BOX 395, CENTRAL CITY, IA 52214-0395
PO BOX 396, CENTRAL CITY, IA 52214-0396
PO BOX 397, CENTRAL CITY, IA 52214-0397
PO BOX 398, CENTRAL CITY, IA 52214-0398
PO BOX 399, CENTRAL CITY, IA 52214-0399
PO BOX 400, CENTRAL CITY, IA 52214-0400
PO BOX 401, CENTRAL CITY, IA 52214-0401
PO BOX 402, CENTRAL CITY, IA 52214-0402
PO BOX 403, CENTRAL CITY, IA 52214-0403
PO BOX 404, CENTRAL CITY, IA 52214-0404
PO BOX 405, CENTRAL CITY, IA 52214-0405
PO BOX 406, CENTRAL CITY, IA 52214-0406
PO BOX 407, CENTRAL CITY, IA 52214-0407
PO BOX 408, CENTRAL CITY, IA 52214-0408
PO BOX 409, CENTRAL CITY, IA 52214-0409
PO BOX 410, CENTRAL CITY, IA 52214-0410
PO BOX 411, CENTRAL CITY, IA 52214-0411
PO BOX 412, CENTRAL CITY, IA 52214-0412
PO BOX 413, CENTRAL CITY, IA 52214-0413
PO BOX 414, CENTRAL CITY, IA 52214-0414
PO BOX 415, CENTRAL CITY, IA 52214-0415
PO BOX 416, CENTRAL CITY, IA 52214-0416
PO BOX 417, CENTRAL CITY, IA 52214-0417
PO BOX 418, CENTRAL CITY, IA 52214-0418
PO BOX 419, CENTRAL CITY, IA 52214-0419
PO BOX 420, CENTRAL CITY, IA 52214-0420
PO BOX 421, CENTRAL CITY, IA 52214-0421
PO BOX 422, CENTRAL CITY, IA 52214-0422
PO BOX 423, CENTRAL CITY, IA 52214-0423
PO BOX 424, CENTRAL CITY, IA 52214-0424
PO BOX 425, CENTRAL CITY, IA 52214-0425
PO BOX 426, CENTRAL CITY, IA 52214-0426
PO BOX 427, CENTRAL CITY, IA 52214-0427
PO BOX 428, CENTRAL CITY, IA 52214-0428
PO BOX 429, CENTRAL CITY, IA 52214-0429
PO BOX 430, CENTRAL CITY, IA 52214-0430
PO BOX 431, CENTRAL CITY, IA 52214-0431
PO BOX 432, CENTRAL CITY, IA 52214-0432
PO BOX 433, CENTRAL CITY, IA 52214-0433
PO BOX 434, CENTRAL CITY, IA 52214-0434
PO BOX 435, CENTRAL CITY, IA 52214-0435
PO BOX 436, CENTRAL CITY, IA 52214-0436
PO BOX 437, CENTRAL CITY, IA 52214-0437
PO BOX 438, CENTRAL CITY, IA 52214-0438
PO BOX 439, CENTRAL CITY, IA 52214-0439
PO BOX 440, CENTRAL CITY, IA 52214-0440
PO BOX 441, CENTRAL CITY, IA 52214-0441
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