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 13301, ARLINGTON, TX 76094-0301
PO BOX 13302, ARLINGTON, TX 76094-0302
PO BOX 13303, ARLINGTON, TX 76094-0303
PO BOX 13304, ARLINGTON, TX 76094-0304
PO BOX 13305, ARLINGTON, TX 76094-0305
PO BOX 13306, ARLINGTON, TX 76094-0306
PO BOX 13307, ARLINGTON, TX 76094-0307
PO BOX 13308, ARLINGTON, TX 76094-0308
PO BOX 13309, ARLINGTON, TX 76094-0309
PO BOX 13310, ARLINGTON, TX 76094-0310
PO BOX 13311, ARLINGTON, TX 76094-0311
PO BOX 13312, ARLINGTON, TX 76094-0312
PO BOX 13313, ARLINGTON, TX 76094-0313
PO BOX 13314, ARLINGTON, TX 76094-0314
PO BOX 13315, ARLINGTON, TX 76094-0315
PO BOX 13316, ARLINGTON, TX 76094-0316
PO BOX 13317, ARLINGTON, TX 76094-0317
PO BOX 13318, ARLINGTON, TX 76094-0318
PO BOX 13319, ARLINGTON, TX 76094-0319
PO BOX 13320, ARLINGTON, TX 76094-0320
PO BOX 13321, ARLINGTON, TX 76094-0321
PO BOX 13322, ARLINGTON, TX 76094-0322
PO BOX 13323, ARLINGTON, TX 76094-0323
PO BOX 13324, ARLINGTON, TX 76094-0324
PO BOX 13325, ARLINGTON, TX 76094-0325
PO BOX 13326, ARLINGTON, TX 76094-0326
PO BOX 13327, ARLINGTON, TX 76094-0327
PO BOX 13328, ARLINGTON, TX 76094-0328
PO BOX 13329, ARLINGTON, TX 76094-0329
PO BOX 13330, ARLINGTON, TX 76094-0330
PO BOX 13331, ARLINGTON, TX 76094-0331
PO BOX 13332, ARLINGTON, TX 76094-0332
PO BOX 13333, ARLINGTON, TX 76094-0333
PO BOX 13334, ARLINGTON, TX 76094-0334
PO BOX 13335, ARLINGTON, TX 76094-0335
PO BOX 13336, ARLINGTON, TX 76094-0336
PO BOX 13337, ARLINGTON, TX 76094-0337
PO BOX 13338, ARLINGTON, TX 76094-0338
PO BOX 13339, ARLINGTON, TX 76094-0339
PO BOX 13340, ARLINGTON, TX 76094-0340
PO BOX 13341, ARLINGTON, TX 76094-0341
PO BOX 13342, ARLINGTON, TX 76094-0342
PO BOX 13343, ARLINGTON, TX 76094-0343
PO BOX 13344, ARLINGTON, TX 76094-0344
PO BOX 13345, ARLINGTON, TX 76094-0345
PO BOX 13346, ARLINGTON, TX 76094-0346
PO BOX 13347, ARLINGTON, TX 76094-0347
PO BOX 13348, ARLINGTON, TX 76094-0348
PO BOX 13349, ARLINGTON, TX 76094-0349
PO BOX 13350, ARLINGTON, TX 76094-0350
PO BOX 13351, ARLINGTON, TX 76094-0351
PO BOX 13352, ARLINGTON, TX 76094-0352
PO BOX 13353, ARLINGTON, TX 76094-0353
PO BOX 13354, ARLINGTON, TX 76094-0354
PO BOX 13355, ARLINGTON, TX 76094-0355
PO BOX 13356, ARLINGTON, TX 76094-0356
PO BOX 13357, ARLINGTON, TX 76094-0357
PO BOX 13358, ARLINGTON, TX 76094-0358
PO BOX 13359, ARLINGTON, TX 76094-0359
PO BOX 13360, ARLINGTON, TX 76094-0360
PO BOX 13361, ARLINGTON, TX 76094-0361
PO BOX 13362, ARLINGTON, TX 76094-0362
PO BOX 13363, ARLINGTON, TX 76094-0363
PO BOX 13364, ARLINGTON, TX 76094-0364
PO BOX 13365, ARLINGTON, TX 76094-0365
PO BOX 13366, ARLINGTON, TX 76094-0366
PO BOX 13367, ARLINGTON, TX 76094-0367
PO BOX 13368, ARLINGTON, TX 76094-0368
PO BOX 13369, ARLINGTON, TX 76094-0369
PO BOX 13370, ARLINGTON, TX 76094-0370
PO BOX 13371, ARLINGTON, TX 76094-0371
PO BOX 13372, ARLINGTON, TX 76094-0372
PO BOX 13373, ARLINGTON, TX 76094-0373
PO BOX 13374, ARLINGTON, TX 76094-0374
PO BOX 13375, ARLINGTON, TX 76094-0375
PO BOX 13376, ARLINGTON, TX 76094-0376
PO BOX 13377, ARLINGTON, TX 76094-0377
PO BOX 13378, ARLINGTON, TX 76094-0378
PO BOX 13379, ARLINGTON, TX 76094-0379
PO BOX 13380, ARLINGTON, TX 76094-0380
PO BOX 13381, ARLINGTON, TX 76094-0381
PO BOX 13382, ARLINGTON, TX 76094-0382
PO BOX 13383, ARLINGTON, TX 76094-0383
PO BOX 13384, ARLINGTON, TX 76094-0384
PO BOX 13385, ARLINGTON, TX 76094-0385
PO BOX 13386, ARLINGTON, TX 76094-0386
PO BOX 13387, ARLINGTON, TX 76094-0387
PO BOX 13388, ARLINGTON, TX 76094-0388
PO BOX 13389, ARLINGTON, TX 76094-0389
PO BOX 13390, ARLINGTON, TX 76094-0390
PO BOX 13391, ARLINGTON, TX 76094-0391
PO BOX 13392, ARLINGTON, TX 76094-0392
PO BOX 13393, ARLINGTON, TX 76094-0393
PO BOX 13394, ARLINGTON, TX 76094-0394
PO BOX 13395, ARLINGTON, TX 76094-0395
PO BOX 13396, ARLINGTON, TX 76094-0396
PO BOX 13397, ARLINGTON, TX 76094-0397
PO BOX 13398, ARLINGTON, TX 76094-0398
PO BOX 13399, ARLINGTON, TX 76094-0399
PO BOX 13400, ARLINGTON, TX 76094-0400
PO BOX 13401, ARLINGTON, TX 76094-0401
PO BOX 13402, ARLINGTON, TX 76094-0402
PO BOX 13403, ARLINGTON, TX 76094-0403
PO BOX 13404, ARLINGTON, TX 76094-0404
PO BOX 13405, ARLINGTON, TX 76094-0405
PO BOX 13406, ARLINGTON, TX 76094-0406
PO BOX 13407, ARLINGTON, TX 76094-0407
PO BOX 13408, ARLINGTON, TX 76094-0408
PO BOX 13409, ARLINGTON, TX 76094-0409
PO BOX 13410, ARLINGTON, TX 76094-0410
PO BOX 13411, ARLINGTON, TX 76094-0411
PO BOX 13412, ARLINGTON, TX 76094-0412
PO BOX 13413, ARLINGTON, TX 76094-0413
PO BOX 13414, ARLINGTON, TX 76094-0414
PO BOX 13415, ARLINGTON, TX 76094-0415
PO BOX 13416, ARLINGTON, TX 76094-0416
PO BOX 13417, ARLINGTON, TX 76094-0417
PO BOX 13418, ARLINGTON, TX 76094-0418
PO BOX 13419, ARLINGTON, TX 76094-0419
PO BOX 13420, ARLINGTON, TX 76094-0420
PO BOX 13421, ARLINGTON, TX 76094-0421
PO BOX 13422, ARLINGTON, TX 76094-0422
PO BOX 13423, ARLINGTON, TX 76094-0423
PO BOX 13424, ARLINGTON, TX 76094-0424
PO BOX 13425, ARLINGTON, TX 76094-0425
PO BOX 13426, ARLINGTON, TX 76094-0426
PO BOX 13427, ARLINGTON, TX 76094-0427
PO BOX 13428, ARLINGTON, TX 76094-0428
PO BOX 13429, ARLINGTON, TX 76094-0429
PO BOX 13430, ARLINGTON, TX 76094-0430
PO BOX 13431, ARLINGTON, TX 76094-0431
PO BOX 13432, ARLINGTON, TX 76094-0432
PO BOX 13433, ARLINGTON, TX 76094-0433
PO BOX 13434, ARLINGTON, TX 76094-0434
PO BOX 13435, ARLINGTON, TX 76094-0435
PO BOX 13436, ARLINGTON, TX 76094-0436
PO BOX 13437, ARLINGTON, TX 76094-0437
PO BOX 13438, ARLINGTON, TX 76094-0438
PO BOX 13439, ARLINGTON, TX 76094-0439
PO BOX 13440, ARLINGTON, TX 76094-0440
PO BOX 13441, ARLINGTON, TX 76094-0441
PO BOX 13442, ARLINGTON, TX 76094-0442
PO BOX 13443, ARLINGTON, TX 76094-0443
PO BOX 13444, ARLINGTON, TX 76094-0444
PO BOX 13445, ARLINGTON, TX 76094-0445
PO BOX 13446, ARLINGTON, TX 76094-0446
PO BOX 13447, ARLINGTON, TX 76094-0447
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