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 8360, JERSEY CITY, NJ 07308-8360
PO BOX 8361, JERSEY CITY, NJ 07308-8361
PO BOX 8362, JERSEY CITY, NJ 07308-8362
PO BOX 8363, JERSEY CITY, NJ 07308-8363
PO BOX 8364, JERSEY CITY, NJ 07308-8364
PO BOX 8365, JERSEY CITY, NJ 07308-8365
PO BOX 8366, JERSEY CITY, NJ 07308-8366
PO BOX 8367, JERSEY CITY, NJ 07308-8367
PO BOX 8368, JERSEY CITY, NJ 07308-8368
PO BOX 8369, JERSEY CITY, NJ 07308-8369
PO BOX 8370, JERSEY CITY, NJ 07308-8370
PO BOX 8371, JERSEY CITY, NJ 07308-8371
PO BOX 8372, JERSEY CITY, NJ 07308-8372
PO BOX 8373, JERSEY CITY, NJ 07308-8373
PO BOX 8374, JERSEY CITY, NJ 07308-8374
PO BOX 8375, JERSEY CITY, NJ 07308-8375
PO BOX 8376, JERSEY CITY, NJ 07308-8376
PO BOX 8377, JERSEY CITY, NJ 07308-8377
PO BOX 8378, JERSEY CITY, NJ 07308-8378
PO BOX 8379, JERSEY CITY, NJ 07308-8379
PO BOX 8380, JERSEY CITY, NJ 07308-8380
PO BOX 8381, JERSEY CITY, NJ 07308-8381
PO BOX 8382, JERSEY CITY, NJ 07308-8382
PO BOX 8383, JERSEY CITY, NJ 07308-8383
PO BOX 8384, JERSEY CITY, NJ 07308-8384
PO BOX 8385, JERSEY CITY, NJ 07308-8385
PO BOX 8386, JERSEY CITY, NJ 07308-8386
PO BOX 8387, JERSEY CITY, NJ 07308-8387
PO BOX 8388, JERSEY CITY, NJ 07308-8388
PO BOX 8389, JERSEY CITY, NJ 07308-8389
PO BOX 8390, JERSEY CITY, NJ 07308-8390
PO BOX 8391, JERSEY CITY, NJ 07308-8391
PO BOX 8392, JERSEY CITY, NJ 07308-8392
PO BOX 8393, JERSEY CITY, NJ 07308-8393
PO BOX 8394, JERSEY CITY, NJ 07308-8394
PO BOX 8395, JERSEY CITY, NJ 07308-8395
PO BOX 8396, JERSEY CITY, NJ 07308-8396
PO BOX 8397, JERSEY CITY, NJ 07308-8397
PO BOX 8398, JERSEY CITY, NJ 07308-8398
PO BOX 8399, JERSEY CITY, NJ 07308-8399
PO BOX 8400, JERSEY CITY, NJ 07308-8400
PO BOX 8401, JERSEY CITY, NJ 07308-8401
PO BOX 8402, JERSEY CITY, NJ 07308-8402
PO BOX 8403, JERSEY CITY, NJ 07308-8403
PO BOX 8404, JERSEY CITY, NJ 07308-8404
PO BOX 8405, JERSEY CITY, NJ 07308-8405
PO BOX 8406, JERSEY CITY, NJ 07308-8406
PO BOX 8407, JERSEY CITY, NJ 07308-8407
PO BOX 8408, JERSEY CITY, NJ 07308-8408
PO BOX 8409, JERSEY CITY, NJ 07308-8409
PO BOX 8410, JERSEY CITY, NJ 07308-8410
PO BOX 8411, JERSEY CITY, NJ 07308-8411
PO BOX 8412, JERSEY CITY, NJ 07308-8412
PO BOX 8413, JERSEY CITY, NJ 07308-8413
PO BOX 8414, JERSEY CITY, NJ 07308-8414
PO BOX 8415, JERSEY CITY, NJ 07308-8415
PO BOX 8416, JERSEY CITY, NJ 07308-8416
PO BOX 8417, JERSEY CITY, NJ 07308-8417
PO BOX 8418, JERSEY CITY, NJ 07308-8418
PO BOX 8419, JERSEY CITY, NJ 07308-8419
PO BOX 8420, JERSEY CITY, NJ 07308-8420
PO BOX 8421, JERSEY CITY, NJ 07308-8421
PO BOX 8422, JERSEY CITY, NJ 07308-8422
PO BOX 8423, JERSEY CITY, NJ 07308-8423
PO BOX 8424, JERSEY CITY, NJ 07308-8424
PO BOX 8425, JERSEY CITY, NJ 07308-8425
PO BOX 8426, JERSEY CITY, NJ 07308-8426
PO BOX 8427, JERSEY CITY, NJ 07308-8427
PO BOX 8428, JERSEY CITY, NJ 07308-8428
PO BOX 8429, JERSEY CITY, NJ 07308-8429
PO BOX 8430, JERSEY CITY, NJ 07308-8430
PO BOX 8431, JERSEY CITY, NJ 07308-8431
PO BOX 8432, JERSEY CITY, NJ 07308-8432
PO BOX 8433, JERSEY CITY, NJ 07308-8433
PO BOX 8434, JERSEY CITY, NJ 07308-8434
PO BOX 8435, JERSEY CITY, NJ 07308-8435
PO BOX 8436, JERSEY CITY, NJ 07308-8436
PO BOX 8437, JERSEY CITY, NJ 07308-8437
PO BOX 8438, JERSEY CITY, NJ 07308-8438
PO BOX 8439, JERSEY CITY, NJ 07308-8439
PO BOX 8440, JERSEY CITY, NJ 07308-8440
PO BOX 8441, JERSEY CITY, NJ 07308-8441
PO BOX 8442, JERSEY CITY, NJ 07308-8442
PO BOX 8443, JERSEY CITY, NJ 07308-8443
PO BOX 8444, JERSEY CITY, NJ 07308-8444
PO BOX 8445, JERSEY CITY, NJ 07308-8445
PO BOX 8446, JERSEY CITY, NJ 07308-8446
PO BOX 8447, JERSEY CITY, NJ 07308-8447
PO BOX 8448, JERSEY CITY, NJ 07308-8448
PO BOX 8449, JERSEY CITY, NJ 07308-8449
PO BOX 8450, JERSEY CITY, NJ 07308-8450
PO BOX 8451, JERSEY CITY, NJ 07308-8451
PO BOX 8452, JERSEY CITY, NJ 07308-8452
PO BOX 8453, JERSEY CITY, NJ 07308-8453
PO BOX 8454, JERSEY CITY, NJ 07308-8454
PO BOX 8455, JERSEY CITY, NJ 07308-8455
PO BOX 8456, JERSEY CITY, NJ 07308-8456
PO BOX 8457, JERSEY CITY, NJ 07308-8457
PO BOX 8458, JERSEY CITY, NJ 07308-8458
PO BOX 8459, JERSEY CITY, NJ 07308-8459
PO BOX 8460, JERSEY CITY, NJ 07308-8460
PO BOX 8461, JERSEY CITY, NJ 07308-8461
PO BOX 8462, JERSEY CITY, NJ 07308-8462
PO BOX 8463, JERSEY CITY, NJ 07308-8463
PO BOX 8464, JERSEY CITY, NJ 07308-8464
PO BOX 8465, JERSEY CITY, NJ 07308-8465
PO BOX 8466, JERSEY CITY, NJ 07308-8466
PO BOX 8467, JERSEY CITY, NJ 07308-8467
PO BOX 8468, JERSEY CITY, NJ 07308-8468
PO BOX 8469, JERSEY CITY, NJ 07308-8469
PO BOX 8470, JERSEY CITY, NJ 07308-8470
PO BOX 8471, JERSEY CITY, NJ 07308-8471
PO BOX 8472, JERSEY CITY, NJ 07308-8472
PO BOX 8473, JERSEY CITY, NJ 07308-8473
PO BOX 8474, JERSEY CITY, NJ 07308-8474
PO BOX 8475, JERSEY CITY, NJ 07308-8475
PO BOX 8476, JERSEY CITY, NJ 07308-8476
PO BOX 8477, JERSEY CITY, NJ 07308-8477
PO BOX 8478, JERSEY CITY, NJ 07308-8478
PO BOX 8479, JERSEY CITY, NJ 07308-8479
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