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 3401, WALLINGTON, NJ 07057-0401
PO BOX 3402, WALLINGTON, NJ 07057-0402
PO BOX 3403, WALLINGTON, NJ 07057-0403
PO BOX 3404, WALLINGTON, NJ 07057-0404
PO BOX 3405, WALLINGTON, NJ 07057-0405
PO BOX 3406, WALLINGTON, NJ 07057-0406
PO BOX 3407, WALLINGTON, NJ 07057-0407
PO BOX 3408, WALLINGTON, NJ 07057-0408
PO BOX 3409, WALLINGTON, NJ 07057-0409
PO BOX 3410, WALLINGTON, NJ 07057-0410
PO BOX 3411, WALLINGTON, NJ 07057-0411
PO BOX 3412, WALLINGTON, NJ 07057-0412
PO BOX 3413, WALLINGTON, NJ 07057-0413
PO BOX 3414, WALLINGTON, NJ 07057-0414
PO BOX 3415, WALLINGTON, NJ 07057-0415
PO BOX 3416, WALLINGTON, NJ 07057-0416
PO BOX 3417, WALLINGTON, NJ 07057-0417
PO BOX 3418, WALLINGTON, NJ 07057-0418
PO BOX 3419, WALLINGTON, NJ 07057-0419
PO BOX 3420, WALLINGTON, NJ 07057-0420
PO BOX 3421, WALLINGTON, NJ 07057-0421
PO BOX 3422, WALLINGTON, NJ 07057-0422
PO BOX 3423, WALLINGTON, NJ 07057-0423
PO BOX 3424, WALLINGTON, NJ 07057-0424
PO BOX 3425, WALLINGTON, NJ 07057-0425
PO BOX 3426, WALLINGTON, NJ 07057-0426
PO BOX 3427, WALLINGTON, NJ 07057-0427
PO BOX 3428, WALLINGTON, NJ 07057-0428
PO BOX 3429, WALLINGTON, NJ 07057-0429
PO BOX 3430, WALLINGTON, NJ 07057-0430
PO BOX 3431, WALLINGTON, NJ 07057-0431
PO BOX 3432, WALLINGTON, NJ 07057-0432
PO BOX 3433, WALLINGTON, NJ 07057-0433
PO BOX 3434, WALLINGTON, NJ 07057-0434
PO BOX 3435, WALLINGTON, NJ 07057-0435
PO BOX 3436, WALLINGTON, NJ 07057-0436
PO BOX 3437, WALLINGTON, NJ 07057-0437
PO BOX 3438, WALLINGTON, NJ 07057-0438
PO BOX 3439, WALLINGTON, NJ 07057-0439
PO BOX 3440, WALLINGTON, NJ 07057-0440
PO BOX 3441, WALLINGTON, NJ 07057-0441
PO BOX 3442, WALLINGTON, NJ 07057-0442
PO BOX 3443, WALLINGTON, NJ 07057-0443
PO BOX 3444, WALLINGTON, NJ 07057-0444
PO BOX 3445, WALLINGTON, NJ 07057-0445
PO BOX 3446, WALLINGTON, NJ 07057-0446
PO BOX 3447, WALLINGTON, NJ 07057-0447
PO BOX 3448, WALLINGTON, NJ 07057-0448
PO BOX 3449, WALLINGTON, NJ 07057-0449
PO BOX 3450, WALLINGTON, NJ 07057-0450
PO BOX 3451, WALLINGTON, NJ 07057-0451
PO BOX 3452, WALLINGTON, NJ 07057-0452
PO BOX 3453, WALLINGTON, NJ 07057-0453
PO BOX 3454, WALLINGTON, NJ 07057-0454
PO BOX 3455, WALLINGTON, NJ 07057-0455
PO BOX 3456, WALLINGTON, NJ 07057-0456
PO BOX 3457, WALLINGTON, NJ 07057-0457
PO BOX 3458, WALLINGTON, NJ 07057-0458
PO BOX 3459, WALLINGTON, NJ 07057-0459
PO BOX 3460, WALLINGTON, NJ 07057-0460
PO BOX 3461, WALLINGTON, NJ 07057-0461
PO BOX 3462, WALLINGTON, NJ 07057-0462
PO BOX 3463, WALLINGTON, NJ 07057-0463
PO BOX 3464, WALLINGTON, NJ 07057-0464
PO BOX 3465, WALLINGTON, NJ 07057-0465
PO BOX 3466, WALLINGTON, NJ 07057-0466
PO BOX 3467, WALLINGTON, NJ 07057-0467
PO BOX 3468, WALLINGTON, NJ 07057-0468
PO BOX 3469, WALLINGTON, NJ 07057-0469
PO BOX 3470, WALLINGTON, NJ 07057-0470
PO BOX 3471, WALLINGTON, NJ 07057-0471
PO BOX 3472, WALLINGTON, NJ 07057-0472
PO BOX 3473, WALLINGTON, NJ 07057-0473
PO BOX 3474, WALLINGTON, NJ 07057-0474
PO BOX 3475, WALLINGTON, NJ 07057-0475
PO BOX 3476, WALLINGTON, NJ 07057-0476
PO BOX 3477, WALLINGTON, NJ 07057-0477
PO BOX 3478, WALLINGTON, NJ 07057-0478
PO BOX 3479, WALLINGTON, NJ 07057-0479
PO BOX 3480, WALLINGTON, NJ 07057-0480
PO BOX 3481, WALLINGTON, NJ 07057-0481
PO BOX 3482, WALLINGTON, NJ 07057-0482
PO BOX 3483, WALLINGTON, NJ 07057-0483
PO BOX 3484, WALLINGTON, NJ 07057-0484
PO BOX 3485, WALLINGTON, NJ 07057-0485
PO BOX 3486, WALLINGTON, NJ 07057-0486
PO BOX 3487, WALLINGTON, NJ 07057-0487
PO BOX 3488, WALLINGTON, NJ 07057-0488
PO BOX 3489, WALLINGTON, NJ 07057-0489
PO BOX 3490, WALLINGTON, NJ 07057-0490
PO BOX 3491, WALLINGTON, NJ 07057-0491
PO BOX 3492, WALLINGTON, NJ 07057-0492
PO BOX 3493, WALLINGTON, NJ 07057-0493
PO BOX 3494, WALLINGTON, NJ 07057-0494
PO BOX 3495, WALLINGTON, NJ 07057-0495
PO BOX 3496, WALLINGTON, NJ 07057-0496
PO BOX 3497, WALLINGTON, NJ 07057-0497
PO BOX 3498, WALLINGTON, NJ 07057-0498
PO BOX 3499, WALLINGTON, NJ 07057-0499
PO BOX 3500, WALLINGTON, NJ 07057-0500
PO BOX 3501, WALLINGTON, NJ 07057-0501
PO BOX 3502, WALLINGTON, NJ 07057-0502
PO BOX 3503, WALLINGTON, NJ 07057-0503
PO BOX 3504, WALLINGTON, NJ 07057-0504
PO BOX 3505, WALLINGTON, NJ 07057-0505
PO BOX 3506, WALLINGTON, NJ 07057-0506
PO BOX 3507, WALLINGTON, NJ 07057-0507
PO BOX 3508, WALLINGTON, NJ 07057-0508
PO BOX 3509, WALLINGTON, NJ 07057-0509
PO BOX 3510, WALLINGTON, NJ 07057-0510
PO BOX 3511, WALLINGTON, NJ 07057-0511
PO BOX 3512, WALLINGTON, NJ 07057-0512
PO BOX 3513, WALLINGTON, NJ 07057-0513
PO BOX 3514, WALLINGTON, NJ 07057-0514
PO BOX 3515, WALLINGTON, NJ 07057-0515
PO BOX 3516, WALLINGTON, NJ 07057-0516
PO BOX 3517, WALLINGTON, NJ 07057-0517
PO BOX 3518, WALLINGTON, NJ 07057-0518
PO BOX 3519, WALLINGTON, NJ 07057-0519
PO BOX 3520, WALLINGTON, NJ 07057-0520
PO BOX 3521, WALLINGTON, NJ 07057-0521
PO BOX 3522, WALLINGTON, NJ 07057-0522
PO BOX 3523, WALLINGTON, NJ 07057-0523
PO BOX 3524, WALLINGTON, NJ 07057-0524
PO BOX 3525, WALLINGTON, NJ 07057-0525
PO BOX 3526, WALLINGTON, NJ 07057-0526
PO BOX 3527, WALLINGTON, NJ 07057-0527
PO BOX 3528, WALLINGTON, NJ 07057-0528
PO BOX 3529, WALLINGTON, NJ 07057-0529
PO BOX 3530, WALLINGTON, NJ 07057-0530
PO BOX 3531, WALLINGTON, NJ 07057-0531
PO BOX 3532, WALLINGTON, NJ 07057-0532
PO BOX 3533, WALLINGTON, NJ 07057-0533
PO BOX 3534, WALLINGTON, NJ 07057-0534
PO BOX 3535, WALLINGTON, NJ 07057-0535
PO BOX 3536, WALLINGTON, NJ 07057-0536
PO BOX 3537, WALLINGTON, NJ 07057-0537
PO BOX 3538, WALLINGTON, NJ 07057-0538
PO BOX 3539, WALLINGTON, NJ 07057-0539
PO BOX 3540, WALLINGTON, NJ 07057-0540
PO BOX 3541, WALLINGTON, NJ 07057-0541
PO BOX 3542, WALLINGTON, NJ 07057-0542
PO BOX 3543, WALLINGTON, NJ 07057-0543
PO BOX 3544, WALLINGTON, NJ 07057-0544
PO BOX 3545, WALLINGTON, NJ 07057-0545
PO BOX 3546, WALLINGTON, NJ 07057-0546
PO BOX 3547, WALLINGTON, NJ 07057-0547
PO BOX 3548, WALLINGTON, NJ 07057-0548
PO BOX 3549, WALLINGTON, NJ 07057-0549
PO BOX 3550, WALLINGTON, NJ 07057-0550
PO BOX 3551, WALLINGTON, NJ 07057-0551
PO BOX 3552, WALLINGTON, NJ 07057-0552
PO BOX 3553, WALLINGTON, NJ 07057-0553
PO BOX 3554, WALLINGTON, NJ 07057-0554
PO BOX 3555, WALLINGTON, NJ 07057-0555
PO BOX 3556, WALLINGTON, NJ 07057-0556
PO BOX 3557, WALLINGTON, NJ 07057-0557
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