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, SOUTH BELOIT, IL 61080-0241
PO BOX 242, SOUTH BELOIT, IL 61080-0242
PO BOX 243, SOUTH BELOIT, IL 61080-0243
PO BOX 244, SOUTH BELOIT, IL 61080-0244
PO BOX 245, SOUTH BELOIT, IL 61080-0245
PO BOX 246, SOUTH BELOIT, IL 61080-0246
PO BOX 247, SOUTH BELOIT, IL 61080-0247
PO BOX 248, SOUTH BELOIT, IL 61080-0248
PO BOX 249, SOUTH BELOIT, IL 61080-0249
PO BOX 250, SOUTH BELOIT, IL 61080-0250
PO BOX 251, SOUTH BELOIT, IL 61080-0251
PO BOX 252, SOUTH BELOIT, IL 61080-0252
PO BOX 253, SOUTH BELOIT, IL 61080-0253
PO BOX 254, SOUTH BELOIT, IL 61080-0254
PO BOX 255, SOUTH BELOIT, IL 61080-0255
PO BOX 256, SOUTH BELOIT, IL 61080-0256
PO BOX 257, SOUTH BELOIT, IL 61080-0257
PO BOX 258, SOUTH BELOIT, IL 61080-0258
PO BOX 259, SOUTH BELOIT, IL 61080-0259
PO BOX 260, SOUTH BELOIT, IL 61080-0260
PO BOX 261, SOUTH BELOIT, IL 61080-0261
PO BOX 262, SOUTH BELOIT, IL 61080-0262
PO BOX 263, SOUTH BELOIT, IL 61080-0263
PO BOX 264, SOUTH BELOIT, IL 61080-0264
PO BOX 265, SOUTH BELOIT, IL 61080-0265
PO BOX 266, SOUTH BELOIT, IL 61080-0266
PO BOX 267, SOUTH BELOIT, IL 61080-0267
PO BOX 268, SOUTH BELOIT, IL 61080-0268
PO BOX 269, SOUTH BELOIT, IL 61080-0269
PO BOX 270, SOUTH BELOIT, IL 61080-0270
PO BOX 271, SOUTH BELOIT, IL 61080-0271
PO BOX 272, SOUTH BELOIT, IL 61080-0272
PO BOX 273, SOUTH BELOIT, IL 61080-0273
PO BOX 274, SOUTH BELOIT, IL 61080-0274
PO BOX 275, SOUTH BELOIT, IL 61080-0275
PO BOX 276, SOUTH BELOIT, IL 61080-0276
PO BOX 277, SOUTH BELOIT, IL 61080-0277
PO BOX 278, SOUTH BELOIT, IL 61080-0278
PO BOX 279, SOUTH BELOIT, IL 61080-0279
PO BOX 280, SOUTH BELOIT, IL 61080-0280
PO BOX 281, SOUTH BELOIT, IL 61080-0281
PO BOX 282, SOUTH BELOIT, IL 61080-0282
PO BOX 283, SOUTH BELOIT, IL 61080-0283
PO BOX 284, SOUTH BELOIT, IL 61080-0284
PO BOX 285, SOUTH BELOIT, IL 61080-0285
PO BOX 286, SOUTH BELOIT, IL 61080-0286
PO BOX 287, SOUTH BELOIT, IL 61080-0287
PO BOX 288, SOUTH BELOIT, IL 61080-0288
PO BOX 289, SOUTH BELOIT, IL 61080-0289
PO BOX 290, SOUTH BELOIT, IL 61080-0290
PO BOX 291, SOUTH BELOIT, IL 61080-0291
PO BOX 292, SOUTH BELOIT, IL 61080-0292
PO BOX 293, SOUTH BELOIT, IL 61080-0293
PO BOX 294, SOUTH BELOIT, IL 61080-0294
PO BOX 295, SOUTH BELOIT, IL 61080-0295
PO BOX 296, SOUTH BELOIT, IL 61080-0296
PO BOX 297, SOUTH BELOIT, IL 61080-0297
PO BOX 298, SOUTH BELOIT, IL 61080-0298
PO BOX 299, SOUTH BELOIT, IL 61080-0299
PO BOX 300, SOUTH BELOIT, IL 61080-0300
PO BOX 301, SOUTH BELOIT, IL 61080-0301
PO BOX 302, SOUTH BELOIT, IL 61080-0302
PO BOX 303, SOUTH BELOIT, IL 61080-0303
PO BOX 304, SOUTH BELOIT, IL 61080-0304
PO BOX 305, SOUTH BELOIT, IL 61080-0305
PO BOX 306, SOUTH BELOIT, IL 61080-0306
PO BOX 307, SOUTH BELOIT, IL 61080-0307
PO BOX 308, SOUTH BELOIT, IL 61080-0308
PO BOX 309, SOUTH BELOIT, IL 61080-0309
PO BOX 310, SOUTH BELOIT, IL 61080-0310
PO BOX 311, SOUTH BELOIT, IL 61080-0311
PO BOX 312, SOUTH BELOIT, IL 61080-0312
PO BOX 313, SOUTH BELOIT, IL 61080-0313
PO BOX 314, SOUTH BELOIT, IL 61080-0314
PO BOX 315, SOUTH BELOIT, IL 61080-0315
PO BOX 316, SOUTH BELOIT, IL 61080-0316
PO BOX 317, SOUTH BELOIT, IL 61080-0317
PO BOX 318, SOUTH BELOIT, IL 61080-0318
PO BOX 319, SOUTH BELOIT, IL 61080-0319
PO BOX 320, SOUTH BELOIT, IL 61080-0320
PO BOX 321, SOUTH BELOIT, IL 61080-0321
PO BOX 322, SOUTH BELOIT, IL 61080-0322
PO BOX 323, SOUTH BELOIT, IL 61080-0323
PO BOX 324, SOUTH BELOIT, IL 61080-0324
PO BOX 325, SOUTH BELOIT, IL 61080-0325
PO BOX 326, SOUTH BELOIT, IL 61080-0326
PO BOX 327, SOUTH BELOIT, IL 61080-0327
PO BOX 328, SOUTH BELOIT, IL 61080-0328
PO BOX 329, SOUTH BELOIT, IL 61080-0329
PO BOX 330, SOUTH BELOIT, IL 61080-0330
PO BOX 331, SOUTH BELOIT, IL 61080-0331
PO BOX 332, SOUTH BELOIT, IL 61080-0332
PO BOX 333, SOUTH BELOIT, IL 61080-0333
PO BOX 334, SOUTH BELOIT, IL 61080-0334
PO BOX 335, SOUTH BELOIT, IL 61080-0335
PO BOX 336, SOUTH BELOIT, IL 61080-0336
PO BOX 337, SOUTH BELOIT, IL 61080-0337
PO BOX 338, SOUTH BELOIT, IL 61080-0338
PO BOX 339, SOUTH BELOIT, IL 61080-0339
PO BOX 340, SOUTH BELOIT, IL 61080-0340
PO BOX 341, SOUTH BELOIT, IL 61080-0341
PO BOX 342, SOUTH BELOIT, IL 61080-0342
PO BOX 343, SOUTH BELOIT, IL 61080-0343
PO BOX 344, SOUTH BELOIT, IL 61080-0344
PO BOX 345, SOUTH BELOIT, IL 61080-0345
PO BOX 346, SOUTH BELOIT, IL 61080-0346
PO BOX 347, SOUTH BELOIT, IL 61080-0347
PO BOX 348, SOUTH BELOIT, IL 61080-0348
PO BOX 349, SOUTH BELOIT, IL 61080-0349
PO BOX 350, SOUTH BELOIT, IL 61080-0350
PO BOX 351, SOUTH BELOIT, IL 61080-0351
PO BOX 352, SOUTH BELOIT, IL 61080-0352
PO BOX 353, SOUTH BELOIT, IL 61080-0353
PO BOX 354, SOUTH BELOIT, IL 61080-0354
PO BOX 355, SOUTH BELOIT, IL 61080-0355
PO BOX 356, SOUTH BELOIT, IL 61080-0356
PO BOX 357, SOUTH BELOIT, IL 61080-0357
PO BOX 358, SOUTH BELOIT, IL 61080-0358
PO BOX 359, SOUTH BELOIT, IL 61080-0359
PO BOX 360, SOUTH BELOIT, IL 61080-0360
PO BOX 361, SOUTH BELOIT, IL 61080-0361
PO BOX 362, SOUTH BELOIT, IL 61080-0362
PO BOX 363, SOUTH BELOIT, IL 61080-0363
PO BOX 364, SOUTH BELOIT, IL 61080-0364
PO BOX 365, SOUTH BELOIT, IL 61080-0365
PO BOX 366, SOUTH BELOIT, IL 61080-0366
PO BOX 367, SOUTH BELOIT, IL 61080-0367
PO BOX 368, SOUTH BELOIT, IL 61080-0368
PO BOX 369, SOUTH BELOIT, IL 61080-0369
PO BOX 370, SOUTH BELOIT, IL 61080-0370
PO BOX 371, SOUTH BELOIT, IL 61080-0371
PO BOX 372, SOUTH BELOIT, IL 61080-0372
PO BOX 373, SOUTH BELOIT, IL 61080-0373
PO BOX 374, SOUTH BELOIT, IL 61080-0374
PO BOX 375, SOUTH BELOIT, IL 61080-0375
PO BOX 376, SOUTH BELOIT, IL 61080-0376
PO BOX 377, SOUTH BELOIT, IL 61080-0377
PO BOX 378, SOUTH BELOIT, IL 61080-0378
PO BOX 379, SOUTH BELOIT, IL 61080-0379
PO BOX 380, SOUTH BELOIT, IL 61080-0380
PO BOX 381, SOUTH BELOIT, IL 61080-0381
PO BOX 382, SOUTH BELOIT, IL 61080-0382
PO BOX 383, SOUTH BELOIT, IL 61080-0383
PO BOX 384, SOUTH BELOIT, IL 61080-0384
PO BOX 385, SOUTH BELOIT, IL 61080-0385
PO BOX 386, SOUTH BELOIT, IL 61080-0386
PO BOX 387, SOUTH BELOIT, IL 61080-0387
PO BOX 388, SOUTH BELOIT, IL 61080-0388
PO BOX 389, SOUTH BELOIT, IL 61080-0389
PO BOX 390, SOUTH BELOIT, IL 61080-0390
PO BOX 391, SOUTH BELOIT, IL 61080-0391
PO BOX 392, SOUTH BELOIT, IL 61080-0392
PO BOX 393, SOUTH BELOIT, IL 61080-0393
PO BOX 394, SOUTH BELOIT, IL 61080-0394
PO BOX 395, SOUTH BELOIT, IL 61080-0395
PO BOX 396, SOUTH BELOIT, IL 61080-0396
PO BOX 397, SOUTH BELOIT, IL 61080-0397
PO BOX 398, SOUTH BELOIT, IL 61080-0398
PO BOX 399, SOUTH BELOIT, IL 61080-0399
PO BOX 400, SOUTH BELOIT, IL 61080-0400
PO BOX 401, SOUTH BELOIT, IL 61080-0401
PO BOX 402, SOUTH BELOIT, IL 61080-0402
PO BOX 403, SOUTH BELOIT, IL 61080-0403
PO BOX 404, SOUTH BELOIT, IL 61080-0404
PO BOX 405, SOUTH BELOIT, IL 61080-0405
PO BOX 406, SOUTH BELOIT, IL 61080-0406
PO BOX 407, SOUTH BELOIT, IL 61080-0407
PO BOX 408, SOUTH BELOIT, IL 61080-0408
PO BOX 409, SOUTH BELOIT, IL 61080-0409
PO BOX 410, SOUTH BELOIT, IL 61080-0410
PO BOX 411, SOUTH BELOIT, IL 61080-0411
PO BOX 412, SOUTH BELOIT, IL 61080-0412
PO BOX 413, SOUTH BELOIT, IL 61080-0413
PO BOX 414, SOUTH BELOIT, IL 61080-0414
PO BOX 415, SOUTH BELOIT, IL 61080-0415
PO BOX 416, SOUTH BELOIT, IL 61080-0416
PO BOX 417, SOUTH BELOIT, IL 61080-0417
PO BOX 418, SOUTH BELOIT, IL 61080-0418
PO BOX 419, SOUTH BELOIT, IL 61080-0419
PO BOX 420, SOUTH BELOIT, IL 61080-0420
PO BOX 421, SOUTH BELOIT, IL 61080-0421
PO BOX 422, SOUTH BELOIT, IL 61080-0422
PO BOX 423, SOUTH BELOIT, IL 61080-0423
PO BOX 424, SOUTH BELOIT, IL 61080-0424
PO BOX 425, SOUTH BELOIT, IL 61080-0425
PO BOX 426, SOUTH BELOIT, IL 61080-0426
PO BOX 427, SOUTH BELOIT, IL 61080-0427
PO BOX 428, SOUTH BELOIT, IL 61080-0428
PO BOX 429, SOUTH BELOIT, IL 61080-0429
PO BOX 430, SOUTH BELOIT, IL 61080-0430
PO BOX 431, SOUTH BELOIT, IL 61080-0431
PO BOX 432, SOUTH BELOIT, IL 61080-0432
PO BOX 433, SOUTH BELOIT, IL 61080-0433
PO BOX 434, SOUTH BELOIT, IL 61080-0434
PO BOX 435, SOUTH BELOIT, IL 61080-0435
PO BOX 436, SOUTH BELOIT, IL 61080-0436
PO BOX 437, SOUTH BELOIT, IL 61080-0437
PO BOX 438, SOUTH BELOIT, IL 61080-0438
PO BOX 439, SOUTH BELOIT, IL 61080-0439
PO BOX 440, SOUTH BELOIT, IL 61080-0440
PO BOX 441, SOUTH BELOIT, IL 61080-0441
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