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 401, PORTLAND, CT 06480-0401
PO BOX 402, PORTLAND, CT 06480-0402
PO BOX 403, PORTLAND, CT 06480-0403
PO BOX 404, PORTLAND, CT 06480-0404
PO BOX 405, PORTLAND, CT 06480-0405
PO BOX 406, PORTLAND, CT 06480-0406
PO BOX 407, PORTLAND, CT 06480-0407
PO BOX 408, PORTLAND, CT 06480-0408
PO BOX 409, PORTLAND, CT 06480-0409
PO BOX 410, PORTLAND, CT 06480-0410
PO BOX 411, PORTLAND, CT 06480-0411
PO BOX 412, PORTLAND, CT 06480-0412
PO BOX 413, PORTLAND, CT 06480-0413
PO BOX 414, PORTLAND, CT 06480-0414
PO BOX 415, PORTLAND, CT 06480-0415
PO BOX 416, PORTLAND, CT 06480-0416
PO BOX 417, PORTLAND, CT 06480-0417
PO BOX 418, PORTLAND, CT 06480-0418
PO BOX 419, PORTLAND, CT 06480-0419
PO BOX 420, PORTLAND, CT 06480-0420
PO BOX 421, PORTLAND, CT 06480-0421
PO BOX 422, PORTLAND, CT 06480-0422
PO BOX 423, PORTLAND, CT 06480-0423
PO BOX 424, PORTLAND, CT 06480-0424
PO BOX 425, PORTLAND, CT 06480-0425
PO BOX 426, PORTLAND, CT 06480-0426
PO BOX 427, PORTLAND, CT 06480-0427
PO BOX 428, PORTLAND, CT 06480-0428
PO BOX 429, PORTLAND, CT 06480-0429
PO BOX 430, PORTLAND, CT 06480-0430
PO BOX 431, PORTLAND, CT 06480-0431
PO BOX 432, PORTLAND, CT 06480-0432
PO BOX 433, PORTLAND, CT 06480-0433
PO BOX 434, PORTLAND, CT 06480-0434
PO BOX 435, PORTLAND, CT 06480-0435
PO BOX 436, PORTLAND, CT 06480-0436
PO BOX 437, PORTLAND, CT 06480-0437
PO BOX 438, PORTLAND, CT 06480-0438
PO BOX 439, PORTLAND, CT 06480-0439
PO BOX 440, PORTLAND, CT 06480-0440
PO BOX 441, PORTLAND, CT 06480-0441
PO BOX 442, PORTLAND, CT 06480-0442
PO BOX 443, PORTLAND, CT 06480-0443
PO BOX 444, PORTLAND, CT 06480-0444
PO BOX 445, PORTLAND, CT 06480-0445
PO BOX 446, PORTLAND, CT 06480-0446
PO BOX 447, PORTLAND, CT 06480-0447
PO BOX 448, PORTLAND, CT 06480-0448
PO BOX 449, PORTLAND, CT 06480-0449
PO BOX 450, PORTLAND, CT 06480-0450
PO BOX 451, PORTLAND, CT 06480-0451
PO BOX 452, PORTLAND, CT 06480-0452
PO BOX 453, PORTLAND, CT 06480-0453
PO BOX 454, PORTLAND, CT 06480-0454
PO BOX 455, PORTLAND, CT 06480-0455
PO BOX 456, PORTLAND, CT 06480-0456
PO BOX 457, PORTLAND, CT 06480-0457
PO BOX 458, PORTLAND, CT 06480-0458
PO BOX 459, PORTLAND, CT 06480-0459
PO BOX 460, PORTLAND, CT 06480-0460
PO BOX 461, PORTLAND, CT 06480-0461
PO BOX 462, PORTLAND, CT 06480-0462
PO BOX 463, PORTLAND, CT 06480-0463
PO BOX 464, PORTLAND, CT 06480-0464
PO BOX 465, PORTLAND, CT 06480-0465
PO BOX 466, PORTLAND, CT 06480-0466
PO BOX 467, PORTLAND, CT 06480-0467
PO BOX 468, PORTLAND, CT 06480-0468
PO BOX 469, PORTLAND, CT 06480-0469
PO BOX 470, PORTLAND, CT 06480-0470
PO BOX 471, PORTLAND, CT 06480-0471
PO BOX 472, PORTLAND, CT 06480-0472
PO BOX 473, PORTLAND, CT 06480-0473
PO BOX 474, PORTLAND, CT 06480-0474
PO BOX 475, PORTLAND, CT 06480-0475
PO BOX 476, PORTLAND, CT 06480-0476
PO BOX 477, PORTLAND, CT 06480-0477
PO BOX 478, PORTLAND, CT 06480-0478
PO BOX 479, PORTLAND, CT 06480-0479
PO BOX 480, PORTLAND, CT 06480-0480
PO BOX 481, PORTLAND, CT 06480-0481
PO BOX 482, PORTLAND, CT 06480-0482
PO BOX 483, PORTLAND, CT 06480-0483
PO BOX 484, PORTLAND, CT 06480-0484
PO BOX 485, PORTLAND, CT 06480-0485
PO BOX 486, PORTLAND, CT 06480-0486
PO BOX 487, PORTLAND, CT 06480-0487
PO BOX 488, PORTLAND, CT 06480-0488
PO BOX 489, PORTLAND, CT 06480-0489
PO BOX 490, PORTLAND, CT 06480-0490
PO BOX 491, PORTLAND, CT 06480-0491
PO BOX 492, PORTLAND, CT 06480-0492
PO BOX 493, PORTLAND, CT 06480-0493
PO BOX 494, PORTLAND, CT 06480-0494
PO BOX 495, PORTLAND, CT 06480-0495
PO BOX 496, PORTLAND, CT 06480-0496
PO BOX 497, PORTLAND, CT 06480-0497
PO BOX 498, PORTLAND, CT 06480-0498
PO BOX 499, PORTLAND, CT 06480-0499
PO BOX 500, PORTLAND, CT 06480-0500
PO BOX 501, PORTLAND, CT 06480-0501
PO BOX 502, PORTLAND, CT 06480-0502
PO BOX 503, PORTLAND, CT 06480-0503
PO BOX 504, PORTLAND, CT 06480-0504
PO BOX 505, PORTLAND, CT 06480-0505
PO BOX 506, PORTLAND, CT 06480-0506
PO BOX 507, PORTLAND, CT 06480-0507
PO BOX 508, PORTLAND, CT 06480-0508
PO BOX 509, PORTLAND, CT 06480-0509
PO BOX 510, PORTLAND, CT 06480-0510
PO BOX 511, PORTLAND, CT 06480-0511
PO BOX 512, PORTLAND, CT 06480-0512
PO BOX 513, PORTLAND, CT 06480-0513
PO BOX 514, PORTLAND, CT 06480-0514
PO BOX 515, PORTLAND, CT 06480-0515
PO BOX 516, PORTLAND, CT 06480-0516
PO BOX 517, PORTLAND, CT 06480-0517
PO BOX 518, PORTLAND, CT 06480-0518
PO BOX 519, PORTLAND, CT 06480-0519
PO BOX 520, PORTLAND, CT 06480-0520
PO BOX 521, PORTLAND, CT 06480-0521
PO BOX 522, PORTLAND, CT 06480-0522
PO BOX 523, PORTLAND, CT 06480-0523
PO BOX 524, PORTLAND, CT 06480-0524
PO BOX 525, PORTLAND, CT 06480-0525
PO BOX 526, PORTLAND, CT 06480-0526
PO BOX 527, PORTLAND, CT 06480-0527
PO BOX 528, PORTLAND, CT 06480-0528
PO BOX 529, PORTLAND, CT 06480-0529
PO BOX 530, PORTLAND, CT 06480-0530
PO BOX 531, PORTLAND, CT 06480-0531
PO BOX 532, PORTLAND, CT 06480-0532
PO BOX 533, PORTLAND, CT 06480-0533
PO BOX 534, PORTLAND, CT 06480-0534
PO BOX 535, PORTLAND, CT 06480-0535
PO BOX 536, PORTLAND, CT 06480-0536
PO BOX 537, PORTLAND, CT 06480-0537
PO BOX 538, PORTLAND, CT 06480-0538
PO BOX 539, PORTLAND, CT 06480-0539
PO BOX 540, PORTLAND, CT 06480-0540
PO BOX 541, PORTLAND, CT 06480-0541
PO BOX 542, PORTLAND, CT 06480-0542
PO BOX 543, PORTLAND, CT 06480-0543
PO BOX 544, PORTLAND, CT 06480-0544
PO BOX 545, PORTLAND, CT 06480-0545
PO BOX 546, PORTLAND, CT 06480-0546
PO BOX 547, PORTLAND, CT 06480-0547
PO BOX 548, PORTLAND, CT 06480-0548
PO BOX 549, PORTLAND, CT 06480-0549
PO BOX 550, PORTLAND, CT 06480-0550
PO BOX 551, PORTLAND, CT 06480-0551
PO BOX 552, PORTLAND, CT 06480-0552
PO BOX 553, PORTLAND, CT 06480-0553
PO BOX 554, PORTLAND, CT 06480-0554
PO BOX 555, PORTLAND, CT 06480-0555
PO BOX 556, PORTLAND, CT 06480-0556
PO BOX 557, PORTLAND, CT 06480-0557
PO BOX 558, PORTLAND, CT 06480-0558
PO BOX 559, PORTLAND, CT 06480-0559
PO BOX 560, PORTLAND, CT 06480-0560
PO BOX 561, PORTLAND, CT 06480-0561
PO BOX 562, PORTLAND, CT 06480-0562
PO BOX 563, PORTLAND, CT 06480-0563
PO BOX 564, PORTLAND, CT 06480-0564
PO BOX 565, PORTLAND, CT 06480-0565
PO BOX 566, PORTLAND, CT 06480-0566
PO BOX 567, PORTLAND, CT 06480-0567
PO BOX 568, PORTLAND, CT 06480-0568
PO BOX 569, PORTLAND, CT 06480-0569
PO BOX 570, PORTLAND, CT 06480-0570
PO BOX 571, PORTLAND, CT 06480-0571
PO BOX 572, PORTLAND, CT 06480-0572
PO BOX 573, PORTLAND, CT 06480-0573
PO BOX 574, PORTLAND, CT 06480-0574
PO BOX 575, PORTLAND, CT 06480-0575
PO BOX 576, PORTLAND, CT 06480-0576
PO BOX 577, PORTLAND, CT 06480-0577
PO BOX 578, PORTLAND, CT 06480-0578
PO BOX 579, PORTLAND, CT 06480-0579
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