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 321, SHELTON, CT 06484-0321
PO BOX 322, SHELTON, CT 06484-0322
PO BOX 323, SHELTON, CT 06484-0323
PO BOX 324, SHELTON, CT 06484-0324
PO BOX 325, SHELTON, CT 06484-0325
PO BOX 326, SHELTON, CT 06484-0326
PO BOX 327, SHELTON, CT 06484-0327
PO BOX 328, SHELTON, CT 06484-0328
PO BOX 329, SHELTON, CT 06484-0329
PO BOX 330, SHELTON, CT 06484-0330
PO BOX 331, SHELTON, CT 06484-0331
PO BOX 332, SHELTON, CT 06484-0332
PO BOX 333, SHELTON, CT 06484-0333
PO BOX 334, SHELTON, CT 06484-0334
PO BOX 335, SHELTON, CT 06484-0335
PO BOX 336, SHELTON, CT 06484-0336
PO BOX 337, SHELTON, CT 06484-0337
PO BOX 338, SHELTON, CT 06484-0338
PO BOX 339, SHELTON, CT 06484-0339
PO BOX 340, SHELTON, CT 06484-0340
PO BOX 341, SHELTON, CT 06484-0341
PO BOX 342, SHELTON, CT 06484-0342
PO BOX 343, SHELTON, CT 06484-0343
PO BOX 344, SHELTON, CT 06484-0344
PO BOX 345, SHELTON, CT 06484-0345
PO BOX 346, SHELTON, CT 06484-0346
PO BOX 347, SHELTON, CT 06484-0347
PO BOX 348, SHELTON, CT 06484-0348
PO BOX 349, SHELTON, CT 06484-0349
PO BOX 350, SHELTON, CT 06484-0350
PO BOX 351, SHELTON, CT 06484-0351
PO BOX 352, SHELTON, CT 06484-0352
PO BOX 353, SHELTON, CT 06484-0353
PO BOX 354, SHELTON, CT 06484-0354
PO BOX 355, SHELTON, CT 06484-0355
PO BOX 356, SHELTON, CT 06484-0356
PO BOX 357, SHELTON, CT 06484-0357
PO BOX 358, SHELTON, CT 06484-0358
PO BOX 359, SHELTON, CT 06484-0359
PO BOX 360, SHELTON, CT 06484-0360
PO BOX 361, SHELTON, CT 06484-0361
PO BOX 362, SHELTON, CT 06484-0362
PO BOX 363, SHELTON, CT 06484-0363
PO BOX 364, SHELTON, CT 06484-0364
PO BOX 365, SHELTON, CT 06484-0365
PO BOX 366, SHELTON, CT 06484-0366
PO BOX 367, SHELTON, CT 06484-0367
PO BOX 368, SHELTON, CT 06484-0368
PO BOX 369, SHELTON, CT 06484-0369
PO BOX 370, SHELTON, CT 06484-0370
PO BOX 371, SHELTON, CT 06484-0371
PO BOX 372, SHELTON, CT 06484-0372
PO BOX 373, SHELTON, CT 06484-0373
PO BOX 374, SHELTON, CT 06484-0374
PO BOX 375, SHELTON, CT 06484-0375
PO BOX 376, SHELTON, CT 06484-0376
PO BOX 377, SHELTON, CT 06484-0377
PO BOX 378, SHELTON, CT 06484-0378
PO BOX 379, SHELTON, CT 06484-0379
PO BOX 380, SHELTON, CT 06484-0380
PO BOX 381, SHELTON, CT 06484-0381
PO BOX 382, SHELTON, CT 06484-0382
PO BOX 383, SHELTON, CT 06484-0383
PO BOX 384, SHELTON, CT 06484-0384
PO BOX 385, SHELTON, CT 06484-0385
PO BOX 386, SHELTON, CT 06484-0386
PO BOX 387, SHELTON, CT 06484-0387
PO BOX 388, SHELTON, CT 06484-0388
PO BOX 389, SHELTON, CT 06484-0389
PO BOX 390, SHELTON, CT 06484-0390
PO BOX 391, SHELTON, CT 06484-0391
PO BOX 392, SHELTON, CT 06484-0392
PO BOX 393, SHELTON, CT 06484-0393
PO BOX 394, SHELTON, CT 06484-0394
PO BOX 395, SHELTON, CT 06484-0395
PO BOX 396, SHELTON, CT 06484-0396
PO BOX 397, SHELTON, CT 06484-0397
PO BOX 398, SHELTON, CT 06484-0398
PO BOX 399, SHELTON, CT 06484-0399
PO BOX 400, SHELTON, CT 06484-0400
PO BOX 401, SHELTON, CT 06484-0401
PO BOX 402, SHELTON, CT 06484-0402
PO BOX 403, SHELTON, CT 06484-0403
PO BOX 404, SHELTON, CT 06484-0404
PO BOX 405, SHELTON, CT 06484-0405
PO BOX 406, SHELTON, CT 06484-0406
PO BOX 407, SHELTON, CT 06484-0407
PO BOX 408, SHELTON, CT 06484-0408
PO BOX 409, SHELTON, CT 06484-0409
PO BOX 410, SHELTON, CT 06484-0410
PO BOX 411, SHELTON, CT 06484-0411
PO BOX 412, SHELTON, CT 06484-0412
PO BOX 413, SHELTON, CT 06484-0413
PO BOX 414, SHELTON, CT 06484-0414
PO BOX 415, SHELTON, CT 06484-0415
PO BOX 416, SHELTON, CT 06484-0416
PO BOX 417, SHELTON, CT 06484-0417
PO BOX 418, SHELTON, CT 06484-0418
PO BOX 419, SHELTON, CT 06484-0419
PO BOX 420, SHELTON, CT 06484-0420
PO BOX 421, SHELTON, CT 06484-0421
PO BOX 422, SHELTON, CT 06484-0422
PO BOX 423, SHELTON, CT 06484-0423
PO BOX 424, SHELTON, CT 06484-0424
PO BOX 425, SHELTON, CT 06484-0425
PO BOX 426, SHELTON, CT 06484-0426
PO BOX 427, SHELTON, CT 06484-0427
PO BOX 428, SHELTON, CT 06484-0428
PO BOX 429, SHELTON, CT 06484-0429
PO BOX 430, SHELTON, CT 06484-0430
PO BOX 431, SHELTON, CT 06484-0431
PO BOX 432, SHELTON, CT 06484-0432
PO BOX 433, SHELTON, CT 06484-0433
PO BOX 434, SHELTON, CT 06484-0434
PO BOX 435, SHELTON, CT 06484-0435
PO BOX 436, SHELTON, CT 06484-0436
PO BOX 437, SHELTON, CT 06484-0437
PO BOX 438, SHELTON, CT 06484-0438
PO BOX 439, SHELTON, CT 06484-0439
PO BOX 440, SHELTON, CT 06484-0440
PO BOX 441, SHELTON, CT 06484-0441
PO BOX 442, SHELTON, CT 06484-0442
PO BOX 443, SHELTON, CT 06484-0443
PO BOX 444, SHELTON, CT 06484-0444
PO BOX 445, SHELTON, CT 06484-0445
PO BOX 446, SHELTON, CT 06484-0446
PO BOX 447, SHELTON, CT 06484-0447
PO BOX 448, SHELTON, CT 06484-0448
PO BOX 449, SHELTON, CT 06484-0449
PO BOX 450, SHELTON, CT 06484-0450
PO BOX 451, SHELTON, CT 06484-0451
PO BOX 452, SHELTON, CT 06484-0452
PO BOX 453, SHELTON, CT 06484-0453
PO BOX 454, SHELTON, CT 06484-0454
PO BOX 455, SHELTON, CT 06484-0455
PO BOX 456, SHELTON, CT 06484-0456
PO BOX 457, SHELTON, CT 06484-0457
PO BOX 458, SHELTON, CT 06484-0458
PO BOX 459, SHELTON, CT 06484-0459
PO BOX 460, SHELTON, CT 06484-0460
PO BOX 461, SHELTON, CT 06484-0461
PO BOX 462, SHELTON, CT 06484-0462
PO BOX 463, SHELTON, CT 06484-0463
PO BOX 464, SHELTON, CT 06484-0464
PO BOX 465, SHELTON, CT 06484-0465
PO BOX 466, SHELTON, CT 06484-0466
PO BOX 467, SHELTON, CT 06484-0467
PO BOX 468, SHELTON, CT 06484-0468
PO BOX 469, SHELTON, CT 06484-0469
PO BOX 470, SHELTON, CT 06484-0470
PO BOX 471, SHELTON, CT 06484-0471
PO BOX 472, SHELTON, CT 06484-0472
PO BOX 473, SHELTON, CT 06484-0473
PO BOX 474, SHELTON, CT 06484-0474
PO BOX 475, SHELTON, CT 06484-0475
PO BOX 476, SHELTON, CT 06484-0476
PO BOX 477, SHELTON, CT 06484-0477
PO BOX 478, SHELTON, CT 06484-0478
PO BOX 479, SHELTON, CT 06484-0479
PO BOX 480, SHELTON, CT 06484-0480
PO BOX 481, SHELTON, CT 06484-0481
PO BOX 482, SHELTON, CT 06484-0482
PO BOX 483, SHELTON, CT 06484-0483
PO BOX 484, SHELTON, CT 06484-0484
PO BOX 485, SHELTON, CT 06484-0485
PO BOX 486, SHELTON, CT 06484-0486
PO BOX 487, SHELTON, CT 06484-0487
PO BOX 488, SHELTON, CT 06484-0488
PO BOX 489, SHELTON, CT 06484-0489
PO BOX 490, SHELTON, CT 06484-0490
PO BOX 491, SHELTON, CT 06484-0491
PO BOX 492, SHELTON, CT 06484-0492
PO BOX 493, SHELTON, CT 06484-0493
PO BOX 494, SHELTON, CT 06484-0494
PO BOX 495, SHELTON, CT 06484-0495
PO BOX 496, SHELTON, CT 06484-0496
PO BOX 497, SHELTON, CT 06484-0497
PO BOX 498, SHELTON, CT 06484-0498
PO BOX 499, SHELTON, CT 06484-0499
PO BOX 500, SHELTON, CT 06484-0500
PO BOX 501, SHELTON, CT 06484-0501
PO BOX 502, SHELTON, CT 06484-0502
PO BOX 503, SHELTON, CT 06484-0503
PO BOX 504, SHELTON, CT 06484-0504
PO BOX 505, SHELTON, CT 06484-0505
PO BOX 506, SHELTON, CT 06484-0506
PO BOX 507, SHELTON, CT 06484-0507
PO BOX 508, SHELTON, CT 06484-0508
PO BOX 509, SHELTON, CT 06484-0509
PO BOX 510, SHELTON, CT 06484-0510
PO BOX 511, SHELTON, CT 06484-0511
PO BOX 512, SHELTON, CT 06484-0512
PO BOX 513, SHELTON, CT 06484-0513
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