تعداد PO BOX می تواند کمتر از چهار رقمی باشد. برای جعبه های اداره پست ، قانون کلی این است که هر جعبه کد ZIP + 4 خود را دارد.
چهار رقم آخر اغلب یکی از موارد زیر است:
1. صفر به علاوه سه رقم آخر شماره جعبه (eg. PO BOX 1001, Los Angeles CA 90001-0001).
2. چهار رقم آخر شماره جعبه (eg. PO BOX 9991, Twin Peaks CA 92391-9991).
3. اگر تعداد جعبه کمتر از چهار رقم باشد ، صفرهای آنقدر که در جلوی شماره جعبه قرار می گیرند ، تولید می شوند تا یک عدد چهار رقمی تولید شود(eg. PO BOX 1, Shreveport LA 71161-0001).
با این حال ، هیچ قانونی یکسان وجود ندارد ، کد پستی بعلاوه چهار فقط برای مرجع است ، کد ZIP + 4 باید برای هر جعبه در وب سایت رسمی USPS به صورت جداگانه جستجو شود.
PO BOX 13400, NEWARK, NJ 07188-3400
PO BOX 13401, NEWARK, NJ 07188-3401
PO BOX 13402, NEWARK, NJ 07188-3402
PO BOX 13403, NEWARK, NJ 07188-3403
PO BOX 13404, NEWARK, NJ 07188-3404
PO BOX 13405, NEWARK, NJ 07188-3405
PO BOX 13406, NEWARK, NJ 07188-3406
PO BOX 13407, NEWARK, NJ 07188-3407
PO BOX 13408, NEWARK, NJ 07188-3408
PO BOX 13409, NEWARK, NJ 07188-3409
PO BOX 13410, NEWARK, NJ 07188-3410
PO BOX 13411, NEWARK, NJ 07188-3411
PO BOX 13412, NEWARK, NJ 07188-3412
PO BOX 13413, NEWARK, NJ 07188-3413
PO BOX 13414, NEWARK, NJ 07188-3414
PO BOX 13415, NEWARK, NJ 07188-3415
PO BOX 13416, NEWARK, NJ 07188-3416
PO BOX 13417, NEWARK, NJ 07188-3417
PO BOX 13418, NEWARK, NJ 07188-3418
PO BOX 13419, NEWARK, NJ 07188-3419
PO BOX 13420, NEWARK, NJ 07188-3420
PO BOX 13421, NEWARK, NJ 07188-3421
PO BOX 13422, NEWARK, NJ 07188-3422
PO BOX 13423, NEWARK, NJ 07188-3423
PO BOX 13424, NEWARK, NJ 07188-3424
PO BOX 13425, NEWARK, NJ 07188-3425
PO BOX 13426, NEWARK, NJ 07188-3426
PO BOX 13427, NEWARK, NJ 07188-3427
PO BOX 13428, NEWARK, NJ 07188-3428
PO BOX 13429, NEWARK, NJ 07188-3429
PO BOX 13430, NEWARK, NJ 07188-3430
PO BOX 13431, NEWARK, NJ 07188-3431
PO BOX 13432, NEWARK, NJ 07188-3432
PO BOX 13433, NEWARK, NJ 07188-3433
PO BOX 13434, NEWARK, NJ 07188-3434
PO BOX 13435, NEWARK, NJ 07188-3435
PO BOX 13436, NEWARK, NJ 07188-3436
PO BOX 13437, NEWARK, NJ 07188-3437
PO BOX 13438, NEWARK, NJ 07188-3438
PO BOX 13439, NEWARK, NJ 07188-3439
PO BOX 13440, NEWARK, NJ 07188-3440
PO BOX 13441, NEWARK, NJ 07188-3441
PO BOX 13442, NEWARK, NJ 07188-3442
PO BOX 13443, NEWARK, NJ 07188-3443
PO BOX 13444, NEWARK, NJ 07188-3444
PO BOX 13445, NEWARK, NJ 07188-3445
PO BOX 13446, NEWARK, NJ 07188-3446
PO BOX 13447, NEWARK, NJ 07188-3447
PO BOX 13448, NEWARK, NJ 07188-3448
PO BOX 13449, NEWARK, NJ 07188-3449
PO BOX 13450, NEWARK, NJ 07188-3450
PO BOX 13451, NEWARK, NJ 07188-3451
PO BOX 13452, NEWARK, NJ 07188-3452
PO BOX 13453, NEWARK, NJ 07188-3453
PO BOX 13454, NEWARK, NJ 07188-3454
PO BOX 13455, NEWARK, NJ 07188-3455
PO BOX 13456, NEWARK, NJ 07188-3456
PO BOX 13457, NEWARK, NJ 07188-3457
PO BOX 13458, NEWARK, NJ 07188-3458
PO BOX 13459, NEWARK, NJ 07188-3459
PO BOX 13460, NEWARK, NJ 07188-3460
PO BOX 13461, NEWARK, NJ 07188-3461
PO BOX 13462, NEWARK, NJ 07188-3462
PO BOX 13463, NEWARK, NJ 07188-3463
PO BOX 13464, NEWARK, NJ 07188-3464
PO BOX 13465, NEWARK, NJ 07188-3465
PO BOX 13466, NEWARK, NJ 07188-3466
PO BOX 13467, NEWARK, NJ 07188-3467
PO BOX 13468, NEWARK, NJ 07188-3468
PO BOX 13469, NEWARK, NJ 07188-3469
PO BOX 13470, NEWARK, NJ 07188-3470
PO BOX 13471, NEWARK, NJ 07188-3471
PO BOX 13472, NEWARK, NJ 07188-3472
PO BOX 13473, NEWARK, NJ 07188-3473
PO BOX 13474, NEWARK, NJ 07188-3474
PO BOX 13475, NEWARK, NJ 07188-3475
PO BOX 13476, NEWARK, NJ 07188-3476
PO BOX 13477, NEWARK, NJ 07188-3477
PO BOX 13478, NEWARK, NJ 07188-3478
PO BOX 13479, NEWARK, NJ 07188-3479
PO BOX 13480, NEWARK, NJ 07188-3480
PO BOX 13481, NEWARK, NJ 07188-3481
PO BOX 13482, NEWARK, NJ 07188-3482
PO BOX 13483, NEWARK, NJ 07188-3483
PO BOX 13484, NEWARK, NJ 07188-3484
PO BOX 13485, NEWARK, NJ 07188-3485
PO BOX 13486, NEWARK, NJ 07188-3486
PO BOX 13487, NEWARK, NJ 07188-3487
PO BOX 13488, NEWARK, NJ 07188-3488
PO BOX 13489, NEWARK, NJ 07188-3489
PO BOX 13490, NEWARK, NJ 07188-3490
PO BOX 13491, NEWARK, NJ 07188-3491
PO BOX 13492, NEWARK, NJ 07188-3492
PO BOX 13493, NEWARK, NJ 07188-3493
PO BOX 13494, NEWARK, NJ 07188-3494
PO BOX 13495, NEWARK, NJ 07188-3495
PO BOX 13496, NEWARK, NJ 07188-3496
PO BOX 13497, NEWARK, NJ 07188-3497
PO BOX 13498, NEWARK, NJ 07188-3498
PO BOX 13499, NEWARK, NJ 07188-3499
PO BOX 13500, NEWARK, NJ 07188-3500
PO BOX 13501, NEWARK, NJ 07188-3501
PO BOX 13502, NEWARK, NJ 07188-3502
PO BOX 13503, NEWARK, NJ 07188-3503
PO BOX 13504, NEWARK, NJ 07188-3504
PO BOX 13505, NEWARK, NJ 07188-3505
PO BOX 13506, NEWARK, NJ 07188-3506
PO BOX 13507, NEWARK, NJ 07188-3507
PO BOX 13508, NEWARK, NJ 07188-3508
PO BOX 13509, NEWARK, NJ 07188-3509
PO BOX 13510, NEWARK, NJ 07188-3510
PO BOX 13511, NEWARK, NJ 07188-3511
PO BOX 13512, NEWARK, NJ 07188-3512
PO BOX 13513, NEWARK, NJ 07188-3513
PO BOX 13514, NEWARK, NJ 07188-3514
PO BOX 13515, NEWARK, NJ 07188-3515
PO BOX 13516, NEWARK, NJ 07188-3516
PO BOX 13517, NEWARK, NJ 07188-3517
PO BOX 13518, NEWARK, NJ 07188-3518
PO BOX 13519, NEWARK, NJ 07188-3519
PO BOX 13520, NEWARK, NJ 07188-3520
PO BOX 13521, NEWARK, NJ 07188-3521
PO BOX 13522, NEWARK, NJ 07188-3522
PO BOX 13523, NEWARK, NJ 07188-3523
PO BOX 13524, NEWARK, NJ 07188-3524
PO BOX 13525, NEWARK, NJ 07188-3525
PO BOX 13526, NEWARK, NJ 07188-3526
PO BOX 13527, NEWARK, NJ 07188-3527
PO BOX 13528, NEWARK, NJ 07188-3528
PO BOX 13529, NEWARK, NJ 07188-3529
PO BOX 13530, NEWARK, NJ 07188-3530
PO BOX 13531, NEWARK, NJ 07188-3531
PO BOX 13532, NEWARK, NJ 07188-3532
PO BOX 13533, NEWARK, NJ 07188-3533
PO BOX 13534, NEWARK, NJ 07188-3534
PO BOX 13535, NEWARK, NJ 07188-3535
PO BOX 13536, NEWARK, NJ 07188-3536
PO BOX 13537, NEWARK, NJ 07188-3537
PO BOX 13538, NEWARK, NJ 07188-3538
PO BOX 13539, NEWARK, NJ 07188-3539
PO BOX 13540, NEWARK, NJ 07188-3540
PO BOX 13541, NEWARK, NJ 07188-3541
PO BOX 13542, NEWARK, NJ 07188-3542
PO BOX 13543, NEWARK, NJ 07188-3543
PO BOX 13544, NEWARK, NJ 07188-3544
PO BOX 13545, NEWARK, NJ 07188-3545
PO BOX 13546, NEWARK, NJ 07188-3546
PO BOX 13547, NEWARK, NJ 07188-3547
PO BOX 13548, NEWARK, NJ 07188-3548
PO BOX 13549, NEWARK, NJ 07188-3549
PO BOX 13550, NEWARK, NJ 07188-3550
PO BOX 13551, NEWARK, NJ 07188-3551
PO BOX 13552, NEWARK, NJ 07188-3552
PO BOX 13553, NEWARK, NJ 07188-3553
PO BOX 13554, NEWARK, NJ 07188-3554
PO BOX 13555, NEWARK, NJ 07188-3555
PO BOX 13556, NEWARK, NJ 07188-3556
PO BOX 13557, NEWARK, NJ 07188-3557
PO BOX 13558, NEWARK, NJ 07188-3558
PO BOX 13559, NEWARK, NJ 07188-3559
PO BOX 13560, NEWARK, NJ 07188-3560
PO BOX 13561, NEWARK, NJ 07188-3561
PO BOX 13562, NEWARK, NJ 07188-3562
PO BOX 13563, NEWARK, NJ 07188-3563
PO BOX 13564, NEWARK, NJ 07188-3564
PO BOX 13565, NEWARK, NJ 07188-3565
PO BOX 13566, NEWARK, NJ 07188-3566
PO BOX 13567, NEWARK, NJ 07188-3567
PO BOX 13568, NEWARK, NJ 07188-3568
PO BOX 13569, NEWARK, NJ 07188-3569
PO BOX 13570, NEWARK, NJ 07188-3570
PO BOX 13571, NEWARK, NJ 07188-3571
PO BOX 13572, NEWARK, NJ 07188-3572
PO BOX 13573, NEWARK, NJ 07188-3573
PO BOX 13574, NEWARK, NJ 07188-3574
PO BOX 13575, NEWARK, NJ 07188-3575
PO BOX 13576, NEWARK, NJ 07188-3576
PO BOX 13577, NEWARK, NJ 07188-3577
PO BOX 13578, NEWARK, NJ 07188-3578