หมายเลขตู้ป ณ . ต้องน้อยกว่าหรือมากกว่าสี่หลัก สำหรับตู้ไปรษณีย์กฎทั่วไปคือแต่ละกล่องจะมีรหัส ZIP + 4 ของตัวเอง
ตัวเลขสี่หลักสุดท้ายมักเป็นตัวเลขใดตัวหนึ่งต่อไปนี้:
1. ศูนย์บวกสามหลักสุดท้ายของหมายเลขกล่อง (eg. PO BOX 1001, Los Angeles CA 90001-0001).
2. สี่หลักสุดท้ายของหมายเลขกล่อง (eg. PO BOX 9991, Twin Peaks CA 92391-9991).
3. หากหมายเลขกล่องน้อยกว่าสี่หลักให้มีเลขศูนย์ที่อยู่ข้างหน้าหมายเลขกล่องมากพอเพื่อสร้างตัวเลขสี่หลัก(eg. PO BOX 1, Shreveport LA 71161-0001).
อย่างไรก็ตามไม่มีกฎที่เหมือนกันรหัสไปรษณีย์บวกสี่ใช้สำหรับการอ้างอิงเท่านั้นต้องค้นหารหัส ZIP + 4 ทีละกล่องในเว็บไซต์ทางการของ USPS
PO BOX 421, PONTE VEDRA BEACH, FL 32004-0421
PO BOX 422, PONTE VEDRA BEACH, FL 32004-0422
PO BOX 423, PONTE VEDRA BEACH, FL 32004-0423
PO BOX 424, PONTE VEDRA BEACH, FL 32004-0424
PO BOX 425, PONTE VEDRA BEACH, FL 32004-0425
PO BOX 426, PONTE VEDRA BEACH, FL 32004-0426
PO BOX 427, PONTE VEDRA BEACH, FL 32004-0427
PO BOX 428, PONTE VEDRA BEACH, FL 32004-0428
PO BOX 429, PONTE VEDRA BEACH, FL 32004-0429
PO BOX 430, PONTE VEDRA BEACH, FL 32004-0430
PO BOX 431, PONTE VEDRA BEACH, FL 32004-0431
PO BOX 432, PONTE VEDRA BEACH, FL 32004-0432
PO BOX 433, PONTE VEDRA BEACH, FL 32004-0433
PO BOX 434, PONTE VEDRA BEACH, FL 32004-0434
PO BOX 435, PONTE VEDRA BEACH, FL 32004-0435
PO BOX 436, PONTE VEDRA BEACH, FL 32004-0436
PO BOX 437, PONTE VEDRA BEACH, FL 32004-0437
PO BOX 438, PONTE VEDRA BEACH, FL 32004-0438
PO BOX 439, PONTE VEDRA BEACH, FL 32004-0439
PO BOX 440, PONTE VEDRA BEACH, FL 32004-0440
PO BOX 441, PONTE VEDRA BEACH, FL 32004-0441
PO BOX 442, PONTE VEDRA BEACH, FL 32004-0442
PO BOX 443, PONTE VEDRA BEACH, FL 32004-0443
PO BOX 444, PONTE VEDRA BEACH, FL 32004-0444
PO BOX 445, PONTE VEDRA BEACH, FL 32004-0445
PO BOX 446, PONTE VEDRA BEACH, FL 32004-0446
PO BOX 447, PONTE VEDRA BEACH, FL 32004-0447
PO BOX 448, PONTE VEDRA BEACH, FL 32004-0448
PO BOX 449, PONTE VEDRA BEACH, FL 32004-0449
PO BOX 450, PONTE VEDRA BEACH, FL 32004-0450
PO BOX 451, PONTE VEDRA BEACH, FL 32004-0451
PO BOX 452, PONTE VEDRA BEACH, FL 32004-0452
PO BOX 453, PONTE VEDRA BEACH, FL 32004-0453
PO BOX 454, PONTE VEDRA BEACH, FL 32004-0454
PO BOX 455, PONTE VEDRA BEACH, FL 32004-0455
PO BOX 456, PONTE VEDRA BEACH, FL 32004-0456
PO BOX 457, PONTE VEDRA BEACH, FL 32004-0457
PO BOX 458, PONTE VEDRA BEACH, FL 32004-0458
PO BOX 459, PONTE VEDRA BEACH, FL 32004-0459
PO BOX 460, PONTE VEDRA BEACH, FL 32004-0460
PO BOX 461, PONTE VEDRA BEACH, FL 32004-0461
PO BOX 462, PONTE VEDRA BEACH, FL 32004-0462
PO BOX 463, PONTE VEDRA BEACH, FL 32004-0463
PO BOX 464, PONTE VEDRA BEACH, FL 32004-0464
PO BOX 465, PONTE VEDRA BEACH, FL 32004-0465
PO BOX 466, PONTE VEDRA BEACH, FL 32004-0466
PO BOX 467, PONTE VEDRA BEACH, FL 32004-0467
PO BOX 468, PONTE VEDRA BEACH, FL 32004-0468
PO BOX 469, PONTE VEDRA BEACH, FL 32004-0469
PO BOX 470, PONTE VEDRA BEACH, FL 32004-0470
PO BOX 471, PONTE VEDRA BEACH, FL 32004-0471
PO BOX 472, PONTE VEDRA BEACH, FL 32004-0472
PO BOX 473, PONTE VEDRA BEACH, FL 32004-0473
PO BOX 474, PONTE VEDRA BEACH, FL 32004-0474
PO BOX 475, PONTE VEDRA BEACH, FL 32004-0475
PO BOX 476, PONTE VEDRA BEACH, FL 32004-0476
PO BOX 477, PONTE VEDRA BEACH, FL 32004-0477
PO BOX 478, PONTE VEDRA BEACH, FL 32004-0478
PO BOX 479, PONTE VEDRA BEACH, FL 32004-0479
PO BOX 480, PONTE VEDRA BEACH, FL 32004-0480
PO BOX 481, PONTE VEDRA BEACH, FL 32004-0481
PO BOX 482, PONTE VEDRA BEACH, FL 32004-0482
PO BOX 483, PONTE VEDRA BEACH, FL 32004-0483
PO BOX 484, PONTE VEDRA BEACH, FL 32004-0484
PO BOX 485, PONTE VEDRA BEACH, FL 32004-0485
PO BOX 486, PONTE VEDRA BEACH, FL 32004-0486
PO BOX 487, PONTE VEDRA BEACH, FL 32004-0487
PO BOX 488, PONTE VEDRA BEACH, FL 32004-0488
PO BOX 489, PONTE VEDRA BEACH, FL 32004-0489
PO BOX 490, PONTE VEDRA BEACH, FL 32004-0490
PO BOX 491, PONTE VEDRA BEACH, FL 32004-0491
PO BOX 492, PONTE VEDRA BEACH, FL 32004-0492
PO BOX 493, PONTE VEDRA BEACH, FL 32004-0493
PO BOX 494, PONTE VEDRA BEACH, FL 32004-0494
PO BOX 495, PONTE VEDRA BEACH, FL 32004-0495
PO BOX 496, PONTE VEDRA BEACH, FL 32004-0496
PO BOX 497, PONTE VEDRA BEACH, FL 32004-0497
PO BOX 498, PONTE VEDRA BEACH, FL 32004-0498
PO BOX 499, PONTE VEDRA BEACH, FL 32004-0499
PO BOX 500, PONTE VEDRA BEACH, FL 32004-0500
PO BOX 501, PONTE VEDRA BEACH, FL 32004-0501
PO BOX 502, PONTE VEDRA BEACH, FL 32004-0502
PO BOX 503, PONTE VEDRA BEACH, FL 32004-0503
PO BOX 504, PONTE VEDRA BEACH, FL 32004-0504
PO BOX 505, PONTE VEDRA BEACH, FL 32004-0505
PO BOX 506, PONTE VEDRA BEACH, FL 32004-0506
PO BOX 507, PONTE VEDRA BEACH, FL 32004-0507
PO BOX 508, PONTE VEDRA BEACH, FL 32004-0508
PO BOX 509, PONTE VEDRA BEACH, FL 32004-0509
PO BOX 510, PONTE VEDRA BEACH, FL 32004-0510
PO BOX 511, PONTE VEDRA BEACH, FL 32004-0511
PO BOX 512, PONTE VEDRA BEACH, FL 32004-0512
PO BOX 513, PONTE VEDRA BEACH, FL 32004-0513
PO BOX 514, PONTE VEDRA BEACH, FL 32004-0514
PO BOX 515, PONTE VEDRA BEACH, FL 32004-0515
PO BOX 516, PONTE VEDRA BEACH, FL 32004-0516
PO BOX 517, PONTE VEDRA BEACH, FL 32004-0517
PO BOX 518, PONTE VEDRA BEACH, FL 32004-0518
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