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 301, FORT FAIRFIELD, ME 04742-0301
PO BOX 302, FORT FAIRFIELD, ME 04742-0302
PO BOX 303, FORT FAIRFIELD, ME 04742-0303
PO BOX 304, FORT FAIRFIELD, ME 04742-0304
PO BOX 305, FORT FAIRFIELD, ME 04742-0305
PO BOX 306, FORT FAIRFIELD, ME 04742-0306
PO BOX 307, FORT FAIRFIELD, ME 04742-0307
PO BOX 308, FORT FAIRFIELD, ME 04742-0308
PO BOX 309, FORT FAIRFIELD, ME 04742-0309
PO BOX 310, FORT FAIRFIELD, ME 04742-0310
PO BOX 311, FORT FAIRFIELD, ME 04742-0311
PO BOX 312, FORT FAIRFIELD, ME 04742-0312
PO BOX 313, FORT FAIRFIELD, ME 04742-0313
PO BOX 314, FORT FAIRFIELD, ME 04742-0314
PO BOX 315, FORT FAIRFIELD, ME 04742-0315
PO BOX 316, FORT FAIRFIELD, ME 04742-0316
PO BOX 317, FORT FAIRFIELD, ME 04742-0317
PO BOX 318, FORT FAIRFIELD, ME 04742-0318
PO BOX 319, FORT FAIRFIELD, ME 04742-0319
PO BOX 320, FORT FAIRFIELD, ME 04742-0320
PO BOX 321, FORT FAIRFIELD, ME 04742-0321
PO BOX 322, FORT FAIRFIELD, ME 04742-0322
PO BOX 323, FORT FAIRFIELD, ME 04742-0323
PO BOX 324, FORT FAIRFIELD, ME 04742-0324
PO BOX 325, FORT FAIRFIELD, ME 04742-0325
PO BOX 326, FORT FAIRFIELD, ME 04742-0326
PO BOX 327, FORT FAIRFIELD, ME 04742-0327
PO BOX 328, FORT FAIRFIELD, ME 04742-0328
PO BOX 329, FORT FAIRFIELD, ME 04742-0329
PO BOX 330, FORT FAIRFIELD, ME 04742-0330
PO BOX 331, FORT FAIRFIELD, ME 04742-0331
PO BOX 332, FORT FAIRFIELD, ME 04742-0332
PO BOX 333, FORT FAIRFIELD, ME 04742-0333
PO BOX 334, FORT FAIRFIELD, ME 04742-0334
PO BOX 335, FORT FAIRFIELD, ME 04742-0335
PO BOX 336, FORT FAIRFIELD, ME 04742-0336
PO BOX 337, FORT FAIRFIELD, ME 04742-0337
PO BOX 338, FORT FAIRFIELD, ME 04742-0338
PO BOX 339, FORT FAIRFIELD, ME 04742-0339
PO BOX 340, FORT FAIRFIELD, ME 04742-0340
PO BOX 341, FORT FAIRFIELD, ME 04742-0341
PO BOX 342, FORT FAIRFIELD, ME 04742-0342
PO BOX 343, FORT FAIRFIELD, ME 04742-0343
PO BOX 344, FORT FAIRFIELD, ME 04742-0344
PO BOX 345, FORT FAIRFIELD, ME 04742-0345
PO BOX 346, FORT FAIRFIELD, ME 04742-0346
PO BOX 347, FORT FAIRFIELD, ME 04742-0347
PO BOX 348, FORT FAIRFIELD, ME 04742-0348
PO BOX 349, FORT FAIRFIELD, ME 04742-0349
PO BOX 350, FORT FAIRFIELD, ME 04742-0350
PO BOX 351, FORT FAIRFIELD, ME 04742-0351
PO BOX 352, FORT FAIRFIELD, ME 04742-0352
PO BOX 353, FORT FAIRFIELD, ME 04742-0353
PO BOX 354, FORT FAIRFIELD, ME 04742-0354
PO BOX 355, FORT FAIRFIELD, ME 04742-0355
PO BOX 356, FORT FAIRFIELD, ME 04742-0356
PO BOX 357, FORT FAIRFIELD, ME 04742-0357
PO BOX 358, FORT FAIRFIELD, ME 04742-0358
PO BOX 359, FORT FAIRFIELD, ME 04742-0359
PO BOX 360, FORT FAIRFIELD, ME 04742-0360
PO BOX 361, FORT FAIRFIELD, ME 04742-0361
PO BOX 362, FORT FAIRFIELD, ME 04742-0362
PO BOX 363, FORT FAIRFIELD, ME 04742-0363
PO BOX 364, FORT FAIRFIELD, ME 04742-0364
PO BOX 365, FORT FAIRFIELD, ME 04742-0365
PO BOX 366, FORT FAIRFIELD, ME 04742-0366
PO BOX 367, FORT FAIRFIELD, ME 04742-0367
PO BOX 368, FORT FAIRFIELD, ME 04742-0368
PO BOX 369, FORT FAIRFIELD, ME 04742-0369
PO BOX 370, FORT FAIRFIELD, ME 04742-0370
PO BOX 371, FORT FAIRFIELD, ME 04742-0371
PO BOX 372, FORT FAIRFIELD, ME 04742-0372
PO BOX 373, FORT FAIRFIELD, ME 04742-0373
PO BOX 374, FORT FAIRFIELD, ME 04742-0374
PO BOX 375, FORT FAIRFIELD, ME 04742-0375
PO BOX 376, FORT FAIRFIELD, ME 04742-0376
PO BOX 377, FORT FAIRFIELD, ME 04742-0377
PO BOX 378, FORT FAIRFIELD, ME 04742-0378
PO BOX 379, FORT FAIRFIELD, ME 04742-0379
PO BOX 380, FORT FAIRFIELD, ME 04742-0380
PO BOX 381, FORT FAIRFIELD, ME 04742-0381
PO BOX 382, FORT FAIRFIELD, ME 04742-0382
PO BOX 383, FORT FAIRFIELD, ME 04742-0383
PO BOX 384, FORT FAIRFIELD, ME 04742-0384
PO BOX 385, FORT FAIRFIELD, ME 04742-0385
PO BOX 386, FORT FAIRFIELD, ME 04742-0386
PO BOX 387, FORT FAIRFIELD, ME 04742-0387
PO BOX 388, FORT FAIRFIELD, ME 04742-0388
PO BOX 389, FORT FAIRFIELD, ME 04742-0389
PO BOX 390, FORT FAIRFIELD, ME 04742-0390
PO BOX 391, FORT FAIRFIELD, ME 04742-0391
PO BOX 392, FORT FAIRFIELD, ME 04742-0392
PO BOX 393, FORT FAIRFIELD, ME 04742-0393
PO BOX 394, FORT FAIRFIELD, ME 04742-0394
PO BOX 395, FORT FAIRFIELD, ME 04742-0395
PO BOX 396, FORT FAIRFIELD, ME 04742-0396
PO BOX 397, FORT FAIRFIELD, ME 04742-0397
PO BOX 398, FORT FAIRFIELD, ME 04742-0398
PO BOX 399, FORT FAIRFIELD, ME 04742-0399
PO BOX 400, FORT FAIRFIELD, ME 04742-0400
PO BOX 401, FORT FAIRFIELD, ME 04742-0401
PO BOX 402, FORT FAIRFIELD, ME 04742-0402
PO BOX 403, FORT FAIRFIELD, ME 04742-0403
PO BOX 404, FORT FAIRFIELD, ME 04742-0404
PO BOX 405, FORT FAIRFIELD, ME 04742-0405
PO BOX 406, FORT FAIRFIELD, ME 04742-0406
PO BOX 407, FORT FAIRFIELD, ME 04742-0407
PO BOX 408, FORT FAIRFIELD, ME 04742-0408
PO BOX 409, FORT FAIRFIELD, ME 04742-0409
PO BOX 410, FORT FAIRFIELD, ME 04742-0410
PO BOX 411, FORT FAIRFIELD, ME 04742-0411
PO BOX 412, FORT FAIRFIELD, ME 04742-0412
PO BOX 413, FORT FAIRFIELD, ME 04742-0413
PO BOX 414, FORT FAIRFIELD, ME 04742-0414
PO BOX 415, FORT FAIRFIELD, ME 04742-0415
PO BOX 416, FORT FAIRFIELD, ME 04742-0416
PO BOX 417, FORT FAIRFIELD, ME 04742-0417
PO BOX 418, FORT FAIRFIELD, ME 04742-0418
PO BOX 419, FORT FAIRFIELD, ME 04742-0419
PO BOX 420, FORT FAIRFIELD, ME 04742-0420
PO BOX 421, FORT FAIRFIELD, ME 04742-0421
PO BOX 422, FORT FAIRFIELD, ME 04742-0422
PO BOX 423, FORT FAIRFIELD, ME 04742-0423
PO BOX 424, FORT FAIRFIELD, ME 04742-0424
PO BOX 425, FORT FAIRFIELD, ME 04742-0425
PO BOX 426, FORT FAIRFIELD, ME 04742-0426
PO BOX 427, FORT FAIRFIELD, ME 04742-0427
PO BOX 428, FORT FAIRFIELD, ME 04742-0428
PO BOX 429, FORT FAIRFIELD, ME 04742-0429
PO BOX 430, FORT FAIRFIELD, ME 04742-0430
PO BOX 431, FORT FAIRFIELD, ME 04742-0431
PO BOX 432, FORT FAIRFIELD, ME 04742-0432
PO BOX 433, FORT FAIRFIELD, ME 04742-0433
PO BOX 434, FORT FAIRFIELD, ME 04742-0434
PO BOX 435, FORT FAIRFIELD, ME 04742-0435
PO BOX 436, FORT FAIRFIELD, ME 04742-0436
PO BOX 437, FORT FAIRFIELD, ME 04742-0437
PO BOX 438, FORT FAIRFIELD, ME 04742-0438
PO BOX 439, FORT FAIRFIELD, ME 04742-0439
PO BOX 440, FORT FAIRFIELD, ME 04742-0440
PO BOX 441, FORT FAIRFIELD, ME 04742-0441
PO BOX 442, FORT FAIRFIELD, ME 04742-0442
PO BOX 443, FORT FAIRFIELD, ME 04742-0443
PO BOX 444, FORT FAIRFIELD, ME 04742-0444
PO BOX 445, FORT FAIRFIELD, ME 04742-0445
PO BOX 446, FORT FAIRFIELD, ME 04742-0446
PO BOX 447, FORT FAIRFIELD, ME 04742-0447
PO BOX 448, FORT FAIRFIELD, ME 04742-0448
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