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 391, PORT JEFFERSON, NY 11777-0391
PO BOX 392, PORT JEFFERSON, NY 11777-0392
PO BOX 393, PORT JEFFERSON, NY 11777-0393
PO BOX 394, PORT JEFFERSON, NY 11777-0394
PO BOX 395, PORT JEFFERSON, NY 11777-0395
PO BOX 396, PORT JEFFERSON, NY 11777-0396
PO BOX 397, PORT JEFFERSON, NY 11777-0397
PO BOX 398, PORT JEFFERSON, NY 11777-0398
PO BOX 399, PORT JEFFERSON, NY 11777-0399
PO BOX 400, PORT JEFFERSON, NY 11777-0400
PO BOX 401, PORT JEFFERSON, NY 11777-0401
PO BOX 402, PORT JEFFERSON, NY 11777-0402
PO BOX 403, PORT JEFFERSON, NY 11777-0403
PO BOX 404, PORT JEFFERSON, NY 11777-0404
PO BOX 405, PORT JEFFERSON, NY 11777-0405
PO BOX 406, PORT JEFFERSON, NY 11777-0406
PO BOX 407, PORT JEFFERSON, NY 11777-0407
PO BOX 408, PORT JEFFERSON, NY 11777-0408
PO BOX 409, PORT JEFFERSON, NY 11777-0409
PO BOX 410, PORT JEFFERSON, NY 11777-0410
PO BOX 411, PORT JEFFERSON, NY 11777-0411
PO BOX 412, PORT JEFFERSON, NY 11777-0412
PO BOX 413, PORT JEFFERSON, NY 11777-0413
PO BOX 414, PORT JEFFERSON, NY 11777-0414
PO BOX 415, PORT JEFFERSON, NY 11777-0415
PO BOX 416, PORT JEFFERSON, NY 11777-0416
PO BOX 417, PORT JEFFERSON, NY 11777-0417
PO BOX 418, PORT JEFFERSON, NY 11777-0418
PO BOX 419, PORT JEFFERSON, NY 11777-0419
PO BOX 420, PORT JEFFERSON, NY 11777-0420
PO BOX 421, PORT JEFFERSON, NY 11777-0421
PO BOX 422, PORT JEFFERSON, NY 11777-0422
PO BOX 423, PORT JEFFERSON, NY 11777-0423
PO BOX 424, PORT JEFFERSON, NY 11777-0424
PO BOX 425, PORT JEFFERSON, NY 11777-0425
PO BOX 426, PORT JEFFERSON, NY 11777-0426
PO BOX 427, PORT JEFFERSON, NY 11777-0427
PO BOX 428, PORT JEFFERSON, NY 11777-0428
PO BOX 429, PORT JEFFERSON, NY 11777-0429
PO BOX 430, PORT JEFFERSON, NY 11777-0430
PO BOX 431, PORT JEFFERSON, NY 11777-0431
PO BOX 432, PORT JEFFERSON, NY 11777-0432
PO BOX 433, PORT JEFFERSON, NY 11777-0433
PO BOX 434, PORT JEFFERSON, NY 11777-0434
PO BOX 435, PORT JEFFERSON, NY 11777-0435
PO BOX 436, PORT JEFFERSON, NY 11777-0436
PO BOX 437, PORT JEFFERSON, NY 11777-0437
PO BOX 438, PORT JEFFERSON, NY 11777-0438
PO BOX 439, PORT JEFFERSON, NY 11777-0439
PO BOX 440, PORT JEFFERSON, NY 11777-0440
PO BOX 441, PORT JEFFERSON, NY 11777-0441
PO BOX 442, PORT JEFFERSON, NY 11777-0442
PO BOX 443, PORT JEFFERSON, NY 11777-0443
PO BOX 444, PORT JEFFERSON, NY 11777-0444
PO BOX 445, PORT JEFFERSON, NY 11777-0445
PO BOX 446, PORT JEFFERSON, NY 11777-0446
PO BOX 447, PORT JEFFERSON, NY 11777-0447
PO BOX 448, PORT JEFFERSON, NY 11777-0448
PO BOX 449, PORT JEFFERSON, NY 11777-0449
PO BOX 450, PORT JEFFERSON, NY 11777-0450
PO BOX 451, PORT JEFFERSON, NY 11777-0451
PO BOX 452, PORT JEFFERSON, NY 11777-0452
PO BOX 453, PORT JEFFERSON, NY 11777-0453
PO BOX 454, PORT JEFFERSON, NY 11777-0454
PO BOX 455, PORT JEFFERSON, NY 11777-0455
PO BOX 456, PORT JEFFERSON, NY 11777-0456
PO BOX 457, PORT JEFFERSON, NY 11777-0457
PO BOX 458, PORT JEFFERSON, NY 11777-0458
PO BOX 459, PORT JEFFERSON, NY 11777-0459
PO BOX 460, PORT JEFFERSON, NY 11777-0460
PO BOX 461, PORT JEFFERSON, NY 11777-0461
PO BOX 462, PORT JEFFERSON, NY 11777-0462
PO BOX 463, PORT JEFFERSON, NY 11777-0463
PO BOX 464, PORT JEFFERSON, NY 11777-0464
PO BOX 465, PORT JEFFERSON, NY 11777-0465
PO BOX 466, PORT JEFFERSON, NY 11777-0466
PO BOX 467, PORT JEFFERSON, NY 11777-0467
PO BOX 468, PORT JEFFERSON, NY 11777-0468
PO BOX 469, PORT JEFFERSON, NY 11777-0469
PO BOX 470, PORT JEFFERSON, NY 11777-0470
PO BOX 471, PORT JEFFERSON, NY 11777-0471
PO BOX 472, PORT JEFFERSON, NY 11777-0472
PO BOX 473, PORT JEFFERSON, NY 11777-0473
PO BOX 474, PORT JEFFERSON, NY 11777-0474
PO BOX 475, PORT JEFFERSON, NY 11777-0475
PO BOX 476, PORT JEFFERSON, NY 11777-0476
PO BOX 477, PORT JEFFERSON, NY 11777-0477
PO BOX 478, PORT JEFFERSON, NY 11777-0478
PO BOX 479, PORT JEFFERSON, NY 11777-0479
PO BOX 480, PORT JEFFERSON, NY 11777-0480
PO BOX 481, PORT JEFFERSON, NY 11777-0481
PO BOX 482, PORT JEFFERSON, NY 11777-0482
PO BOX 483, PORT JEFFERSON, NY 11777-0483
PO BOX 484, PORT JEFFERSON, NY 11777-0484
PO BOX 485, PORT JEFFERSON, NY 11777-0485
PO BOX 486, PORT JEFFERSON, NY 11777-0486
PO BOX 487, PORT JEFFERSON, NY 11777-0487
PO BOX 488, PORT JEFFERSON, NY 11777-0488
PO BOX 489, PORT JEFFERSON, NY 11777-0489
PO BOX 490, PORT JEFFERSON, NY 11777-0490
PO BOX 491, PORT JEFFERSON, NY 11777-0491
PO BOX 492, PORT JEFFERSON, NY 11777-0492
PO BOX 493, PORT JEFFERSON, NY 11777-0493
PO BOX 494, PORT JEFFERSON, NY 11777-0494
PO BOX 495, PORT JEFFERSON, NY 11777-0495
PO BOX 496, PORT JEFFERSON, NY 11777-0496
PO BOX 497, PORT JEFFERSON, NY 11777-0497
PO BOX 498, PORT JEFFERSON, NY 11777-0498
PO BOX 499, PORT JEFFERSON, NY 11777-0499
PO BOX 500, PORT JEFFERSON, NY 11777-0500
PO BOX 501, PORT JEFFERSON, NY 11777-0501
PO BOX 502, PORT JEFFERSON, NY 11777-0502
PO BOX 503, PORT JEFFERSON, NY 11777-0503
PO BOX 504, PORT JEFFERSON, NY 11777-0504
PO BOX 505, PORT JEFFERSON, NY 11777-0505
PO BOX 506, PORT JEFFERSON, NY 11777-0506
PO BOX 507, PORT JEFFERSON, NY 11777-0507
PO BOX 508, PORT JEFFERSON, NY 11777-0508
PO BOX 509, PORT JEFFERSON, NY 11777-0509
PO BOX 510, PORT JEFFERSON, NY 11777-0510
PO BOX 511, PORT JEFFERSON, NY 11777-0511
PO BOX 512, PORT JEFFERSON, NY 11777-0512
PO BOX 513, PORT JEFFERSON, NY 11777-0513
PO BOX 514, PORT JEFFERSON, NY 11777-0514
PO BOX 515, PORT JEFFERSON, NY 11777-0515
PO BOX 516, PORT JEFFERSON, NY 11777-0516
PO BOX 517, PORT JEFFERSON, NY 11777-0517
PO BOX 518, PORT JEFFERSON, NY 11777-0518
PO BOX 519, PORT JEFFERSON, NY 11777-0519
PO BOX 520, PORT JEFFERSON, NY 11777-0520
PO BOX 521, PORT JEFFERSON, NY 11777-0521
PO BOX 522, PORT JEFFERSON, NY 11777-0522
PO BOX 523, PORT JEFFERSON, NY 11777-0523
PO BOX 524, PORT JEFFERSON, NY 11777-0524
PO BOX 525, PORT JEFFERSON, NY 11777-0525
PO BOX 526, PORT JEFFERSON, NY 11777-0526
PO BOX 527, PORT JEFFERSON, NY 11777-0527
PO BOX 528, PORT JEFFERSON, NY 11777-0528
PO BOX 529, PORT JEFFERSON, NY 11777-0529
PO BOX 530, PORT JEFFERSON, NY 11777-0530
PO BOX 531, PORT JEFFERSON, NY 11777-0531
PO BOX 532, PORT JEFFERSON, NY 11777-0532
PO BOX 533, PORT JEFFERSON, NY 11777-0533
PO BOX 534, PORT JEFFERSON, NY 11777-0534
PO BOX 535, PORT JEFFERSON, NY 11777-0535
PO BOX 536, PORT JEFFERSON, NY 11777-0536
PO BOX 537, PORT JEFFERSON, NY 11777-0537
PO BOX 538, PORT JEFFERSON, NY 11777-0538
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