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, MADISON, CT 06443-0321
PO BOX 322, MADISON, CT 06443-0322
PO BOX 323, MADISON, CT 06443-0323
PO BOX 324, MADISON, CT 06443-0324
PO BOX 325, MADISON, CT 06443-0325
PO BOX 326, MADISON, CT 06443-0326
PO BOX 327, MADISON, CT 06443-0327
PO BOX 328, MADISON, CT 06443-0328
PO BOX 329, MADISON, CT 06443-0329
PO BOX 330, MADISON, CT 06443-0330
PO BOX 331, MADISON, CT 06443-0331
PO BOX 332, MADISON, CT 06443-0332
PO BOX 333, MADISON, CT 06443-0333
PO BOX 334, MADISON, CT 06443-0334
PO BOX 335, MADISON, CT 06443-0335
PO BOX 336, MADISON, CT 06443-0336
PO BOX 337, MADISON, CT 06443-0337
PO BOX 338, MADISON, CT 06443-0338
PO BOX 339, MADISON, CT 06443-0339
PO BOX 340, MADISON, CT 06443-0340
PO BOX 341, MADISON, CT 06443-0341
PO BOX 342, MADISON, CT 06443-0342
PO BOX 343, MADISON, CT 06443-0343
PO BOX 344, MADISON, CT 06443-0344
PO BOX 345, MADISON, CT 06443-0345
PO BOX 346, MADISON, CT 06443-0346
PO BOX 347, MADISON, CT 06443-0347
PO BOX 348, MADISON, CT 06443-0348
PO BOX 349, MADISON, CT 06443-0349
PO BOX 350, MADISON, CT 06443-0350
PO BOX 351, MADISON, CT 06443-0351
PO BOX 352, MADISON, CT 06443-0352
PO BOX 353, MADISON, CT 06443-0353
PO BOX 354, MADISON, CT 06443-0354
PO BOX 355, MADISON, CT 06443-0355
PO BOX 356, MADISON, CT 06443-0356
PO BOX 357, MADISON, CT 06443-0357
PO BOX 358, MADISON, CT 06443-0358
PO BOX 359, MADISON, CT 06443-0359
PO BOX 360, MADISON, CT 06443-0360
PO BOX 361, MADISON, CT 06443-0361
PO BOX 362, MADISON, CT 06443-0362
PO BOX 363, MADISON, CT 06443-0363
PO BOX 364, MADISON, CT 06443-0364
PO BOX 365, MADISON, CT 06443-0365
PO BOX 366, MADISON, CT 06443-0366
PO BOX 367, MADISON, CT 06443-0367
PO BOX 368, MADISON, CT 06443-0368
PO BOX 369, MADISON, CT 06443-0369
PO BOX 370, MADISON, CT 06443-0370
PO BOX 371, MADISON, CT 06443-0371
PO BOX 372, MADISON, CT 06443-0372
PO BOX 373, MADISON, CT 06443-0373
PO BOX 374, MADISON, CT 06443-0374
PO BOX 375, MADISON, CT 06443-0375
PO BOX 376, MADISON, CT 06443-0376
PO BOX 377, MADISON, CT 06443-0377
PO BOX 378, MADISON, CT 06443-0378
PO BOX 379, MADISON, CT 06443-0379
PO BOX 380, MADISON, CT 06443-0380
PO BOX 381, MADISON, CT 06443-0381
PO BOX 382, MADISON, CT 06443-0382
PO BOX 383, MADISON, CT 06443-0383
PO BOX 384, MADISON, CT 06443-0384
PO BOX 385, MADISON, CT 06443-0385
PO BOX 386, MADISON, CT 06443-0386
PO BOX 387, MADISON, CT 06443-0387
PO BOX 388, MADISON, CT 06443-0388
PO BOX 389, MADISON, CT 06443-0389
PO BOX 390, MADISON, CT 06443-0390
PO BOX 391, MADISON, CT 06443-0391
PO BOX 392, MADISON, CT 06443-0392
PO BOX 393, MADISON, CT 06443-0393
PO BOX 394, MADISON, CT 06443-0394
PO BOX 395, MADISON, CT 06443-0395
PO BOX 396, MADISON, CT 06443-0396
PO BOX 397, MADISON, CT 06443-0397
PO BOX 398, MADISON, CT 06443-0398
PO BOX 399, MADISON, CT 06443-0399
PO BOX 400, MADISON, CT 06443-0400
PO BOX 401, MADISON, CT 06443-0401
PO BOX 402, MADISON, CT 06443-0402
PO BOX 403, MADISON, CT 06443-0403
PO BOX 404, MADISON, CT 06443-0404
PO BOX 405, MADISON, CT 06443-0405
PO BOX 406, MADISON, CT 06443-0406
PO BOX 407, MADISON, CT 06443-0407
PO BOX 408, MADISON, CT 06443-0408
PO BOX 409, MADISON, CT 06443-0409
PO BOX 410, MADISON, CT 06443-0410
PO BOX 411, MADISON, CT 06443-0411
PO BOX 412, MADISON, CT 06443-0412
PO BOX 413, MADISON, CT 06443-0413
PO BOX 414, MADISON, CT 06443-0414
PO BOX 415, MADISON, CT 06443-0415
PO BOX 416, MADISON, CT 06443-0416
PO BOX 417, MADISON, CT 06443-0417
PO BOX 418, MADISON, CT 06443-0418
PO BOX 419, MADISON, CT 06443-0419
PO BOX 420, MADISON, CT 06443-0420
PO BOX 421, MADISON, CT 06443-0421
PO BOX 422, MADISON, CT 06443-0422
PO BOX 423, MADISON, CT 06443-0423
PO BOX 424, MADISON, CT 06443-0424
PO BOX 425, MADISON, CT 06443-0425
PO BOX 426, MADISON, CT 06443-0426
PO BOX 427, MADISON, CT 06443-0427
PO BOX 428, MADISON, CT 06443-0428
PO BOX 429, MADISON, CT 06443-0429
PO BOX 430, MADISON, CT 06443-0430
PO BOX 431, MADISON, CT 06443-0431
PO BOX 432, MADISON, CT 06443-0432
PO BOX 433, MADISON, CT 06443-0433
PO BOX 434, MADISON, CT 06443-0434
PO BOX 435, MADISON, CT 06443-0435
PO BOX 436, MADISON, CT 06443-0436
PO BOX 437, MADISON, CT 06443-0437
PO BOX 438, MADISON, CT 06443-0438
PO BOX 439, MADISON, CT 06443-0439
PO BOX 440, MADISON, CT 06443-0440
PO BOX 441, MADISON, CT 06443-0441
PO BOX 442, MADISON, CT 06443-0442
PO BOX 443, MADISON, CT 06443-0443
PO BOX 444, MADISON, CT 06443-0444
PO BOX 445, MADISON, CT 06443-0445
PO BOX 446, MADISON, CT 06443-0446
PO BOX 447, MADISON, CT 06443-0447
PO BOX 448, MADISON, CT 06443-0448
PO BOX 449, MADISON, CT 06443-0449
PO BOX 450, MADISON, CT 06443-0450
PO BOX 451, MADISON, CT 06443-0451
PO BOX 452, MADISON, CT 06443-0452
PO BOX 453, MADISON, CT 06443-0453
PO BOX 454, MADISON, CT 06443-0454
PO BOX 455, MADISON, CT 06443-0455
PO BOX 456, MADISON, CT 06443-0456
PO BOX 457, MADISON, CT 06443-0457
PO BOX 458, MADISON, CT 06443-0458
PO BOX 459, MADISON, CT 06443-0459
PO BOX 460, MADISON, CT 06443-0460
PO BOX 461, MADISON, CT 06443-0461
PO BOX 462, MADISON, CT 06443-0462
PO BOX 463, MADISON, CT 06443-0463
PO BOX 464, MADISON, CT 06443-0464
PO BOX 465, MADISON, CT 06443-0465
PO BOX 466, MADISON, CT 06443-0466
PO BOX 467, MADISON, CT 06443-0467
PO BOX 468, MADISON, CT 06443-0468
PO BOX 469, MADISON, CT 06443-0469
PO BOX 470, MADISON, CT 06443-0470
PO BOX 471, MADISON, CT 06443-0471
PO BOX 472, MADISON, CT 06443-0472
PO BOX 473, MADISON, CT 06443-0473
PO BOX 474, MADISON, CT 06443-0474
PO BOX 475, MADISON, CT 06443-0475
PO BOX 476, MADISON, CT 06443-0476
PO BOX 477, MADISON, CT 06443-0477
PO BOX 478, MADISON, CT 06443-0478
PO BOX 479, MADISON, CT 06443-0479
PO BOX 480, MADISON, CT 06443-0480
PO BOX 481, MADISON, CT 06443-0481
PO BOX 482, MADISON, CT 06443-0482
PO BOX 483, MADISON, CT 06443-0483
PO BOX 484, MADISON, CT 06443-0484
PO BOX 485, MADISON, CT 06443-0485
PO BOX 486, MADISON, CT 06443-0486
PO BOX 487, MADISON, CT 06443-0487
PO BOX 488, MADISON, CT 06443-0488
PO BOX 489, MADISON, CT 06443-0489
PO BOX 490, MADISON, CT 06443-0490
PO BOX 491, MADISON, CT 06443-0491
PO BOX 492, MADISON, CT 06443-0492
PO BOX 493, MADISON, CT 06443-0493
PO BOX 494, MADISON, CT 06443-0494
PO BOX 495, MADISON, CT 06443-0495
PO BOX 496, MADISON, CT 06443-0496
PO BOX 497, MADISON, CT 06443-0497
PO BOX 498, MADISON, CT 06443-0498
PO BOX 499, MADISON, CT 06443-0499
PO BOX 500, MADISON, CT 06443-0500
PO BOX 501, MADISON, CT 06443-0501
PO BOX 502, MADISON, CT 06443-0502
PO BOX 503, MADISON, CT 06443-0503
PO BOX 504, MADISON, CT 06443-0504
PO BOX 505, MADISON, CT 06443-0505
PO BOX 506, MADISON, CT 06443-0506
PO BOX 507, MADISON, CT 06443-0507
PO BOX 508, MADISON, CT 06443-0508
PO BOX 509, MADISON, CT 06443-0509
PO BOX 510, MADISON, CT 06443-0510
PO BOX 511, MADISON, CT 06443-0511
Add new comment