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 15255, SPRINGFIELD, MA 01115-5255
PO BOX 15256, SPRINGFIELD, MA 01115-5256
PO BOX 15257, SPRINGFIELD, MA 01115-5257
PO BOX 15258, SPRINGFIELD, MA 01115-5258
PO BOX 15259, SPRINGFIELD, MA 01115-5259
PO BOX 15260, SPRINGFIELD, MA 01115-5260
PO BOX 15261, SPRINGFIELD, MA 01115-5261
PO BOX 15262, SPRINGFIELD, MA 01115-5262
PO BOX 15263, SPRINGFIELD, MA 01115-5263
PO BOX 15264, SPRINGFIELD, MA 01115-5264
PO BOX 15265, SPRINGFIELD, MA 01115-5265
PO BOX 15266, SPRINGFIELD, MA 01115-5266
PO BOX 15267, SPRINGFIELD, MA 01115-5267
PO BOX 15268, SPRINGFIELD, MA 01115-5268
PO BOX 15269, SPRINGFIELD, MA 01115-5269
PO BOX 15270, SPRINGFIELD, MA 01115-5270
PO BOX 15271, SPRINGFIELD, MA 01115-5271
PO BOX 15272, SPRINGFIELD, MA 01115-5272
PO BOX 15273, SPRINGFIELD, MA 01115-5273
PO BOX 15274, SPRINGFIELD, MA 01115-5274
PO BOX 15275, SPRINGFIELD, MA 01115-5275
PO BOX 15276, SPRINGFIELD, MA 01115-5276
PO BOX 15277, SPRINGFIELD, MA 01115-5277
PO BOX 15278, SPRINGFIELD, MA 01115-5278
PO BOX 15279, SPRINGFIELD, MA 01115-5279
PO BOX 15280, SPRINGFIELD, MA 01115-5280
PO BOX 15281, SPRINGFIELD, MA 01115-5281
PO BOX 15282, SPRINGFIELD, MA 01115-5282
PO BOX 15283, SPRINGFIELD, MA 01115-5283
PO BOX 15284, SPRINGFIELD, MA 01115-5284
PO BOX 15285, SPRINGFIELD, MA 01115-5285
PO BOX 15286, SPRINGFIELD, MA 01115-5286
PO BOX 15287, SPRINGFIELD, MA 01115-5287
PO BOX 15288, SPRINGFIELD, MA 01115-5288
PO BOX 15289, SPRINGFIELD, MA 01115-5289
PO BOX 15290, SPRINGFIELD, MA 01115-5290
PO BOX 15291, SPRINGFIELD, MA 01115-5291
PO BOX 15292, SPRINGFIELD, MA 01115-5292
PO BOX 15293, SPRINGFIELD, MA 01115-5293
PO BOX 15294, SPRINGFIELD, MA 01115-5294
PO BOX 15295, SPRINGFIELD, MA 01115-5295
PO BOX 15296, SPRINGFIELD, MA 01115-5296
PO BOX 15297, SPRINGFIELD, MA 01115-5297
PO BOX 15298, SPRINGFIELD, MA 01115-5298
PO BOX 15299, SPRINGFIELD, MA 01115-5299
PO BOX 15300, SPRINGFIELD, MA 01115-5300
PO BOX 15301, SPRINGFIELD, MA 01115-5301
PO BOX 15302, SPRINGFIELD, MA 01115-5302
PO BOX 15303, SPRINGFIELD, MA 01115-5303
PO BOX 15304, SPRINGFIELD, MA 01115-5304
PO BOX 15305, SPRINGFIELD, MA 01115-5305
PO BOX 15306, SPRINGFIELD, MA 01115-5306
PO BOX 15307, SPRINGFIELD, MA 01115-5307
PO BOX 15308, SPRINGFIELD, MA 01115-5308
PO BOX 15309, SPRINGFIELD, MA 01115-5309
PO BOX 15310, SPRINGFIELD, MA 01115-5310
PO BOX 15311, SPRINGFIELD, MA 01115-5311
PO BOX 15312, SPRINGFIELD, MA 01115-5312
PO BOX 15313, SPRINGFIELD, MA 01115-5313
PO BOX 15314, SPRINGFIELD, MA 01115-5314
PO BOX 15315, SPRINGFIELD, MA 01115-5315
PO BOX 15316, SPRINGFIELD, MA 01115-5316
PO BOX 15317, SPRINGFIELD, MA 01115-5317
PO BOX 15318, SPRINGFIELD, MA 01115-5318
PO BOX 15319, SPRINGFIELD, MA 01115-5319
PO BOX 15320, SPRINGFIELD, MA 01115-5320
PO BOX 15321, SPRINGFIELD, MA 01115-5321
PO BOX 15322, SPRINGFIELD, MA 01115-5322
PO BOX 15323, SPRINGFIELD, MA 01115-5323
PO BOX 15324, SPRINGFIELD, MA 01115-5324
PO BOX 15325, SPRINGFIELD, MA 01115-5325
PO BOX 15326, SPRINGFIELD, MA 01115-5326
PO BOX 15327, SPRINGFIELD, MA 01115-5327
PO BOX 15328, SPRINGFIELD, MA 01115-5328
PO BOX 15329, SPRINGFIELD, MA 01115-5329
PO BOX 15330, SPRINGFIELD, MA 01115-5330
PO BOX 15331, SPRINGFIELD, MA 01115-5331
PO BOX 15332, SPRINGFIELD, MA 01115-5332
PO BOX 15333, SPRINGFIELD, MA 01115-5333
PO BOX 15334, SPRINGFIELD, MA 01115-5334
PO BOX 15335, SPRINGFIELD, MA 01115-5335
PO BOX 15336, SPRINGFIELD, MA 01115-5336
PO BOX 15337, SPRINGFIELD, MA 01115-5337
PO BOX 15338, SPRINGFIELD, MA 01115-5338
PO BOX 15339, SPRINGFIELD, MA 01115-5339
PO BOX 15340, SPRINGFIELD, MA 01115-5340
PO BOX 15341, SPRINGFIELD, MA 01115-5341
PO BOX 15342, SPRINGFIELD, MA 01115-5342
PO BOX 15343, SPRINGFIELD, MA 01115-5343
PO BOX 15344, SPRINGFIELD, MA 01115-5344
PO BOX 15345, SPRINGFIELD, MA 01115-5345
PO BOX 15346, SPRINGFIELD, MA 01115-5346
PO BOX 15347, SPRINGFIELD, MA 01115-5347
PO BOX 15348, SPRINGFIELD, MA 01115-5348
PO BOX 15349, SPRINGFIELD, MA 01115-5349
PO BOX 15350, SPRINGFIELD, MA 01115-5350
PO BOX 15351, SPRINGFIELD, MA 01115-5351
PO BOX 15352, SPRINGFIELD, MA 01115-5352
PO BOX 15353, SPRINGFIELD, MA 01115-5353
PO BOX 15354, SPRINGFIELD, MA 01115-5354
PO BOX 15355, SPRINGFIELD, MA 01115-5355
PO BOX 15356, SPRINGFIELD, MA 01115-5356
PO BOX 15357, SPRINGFIELD, MA 01115-5357
PO BOX 15358, SPRINGFIELD, MA 01115-5358
PO BOX 15359, SPRINGFIELD, MA 01115-5359
PO BOX 15360, SPRINGFIELD, MA 01115-5360
PO BOX 15361, SPRINGFIELD, MA 01115-5361
PO BOX 15362, SPRINGFIELD, MA 01115-5362
PO BOX 15363, SPRINGFIELD, MA 01115-5363
PO BOX 15364, SPRINGFIELD, MA 01115-5364
PO BOX 15365, SPRINGFIELD, MA 01115-5365
PO BOX 15366, SPRINGFIELD, MA 01115-5366
PO BOX 15367, SPRINGFIELD, MA 01115-5367
PO BOX 15368, SPRINGFIELD, MA 01115-5368
PO BOX 15369, SPRINGFIELD, MA 01115-5369
PO BOX 15370, SPRINGFIELD, MA 01115-5370
PO BOX 15371, SPRINGFIELD, MA 01115-5371
PO BOX 15372, SPRINGFIELD, MA 01115-5372
PO BOX 15373, SPRINGFIELD, MA 01115-5373
PO BOX 15374, SPRINGFIELD, MA 01115-5374
PO BOX 15375, SPRINGFIELD, MA 01115-5375
PO BOX 15376, SPRINGFIELD, MA 01115-5376
PO BOX 15377, SPRINGFIELD, MA 01115-5377
PO BOX 15378, SPRINGFIELD, MA 01115-5378
PO BOX 15379, SPRINGFIELD, MA 01115-5379
PO BOX 15380, SPRINGFIELD, MA 01115-5380
PO BOX 15381, SPRINGFIELD, MA 01115-5381
PO BOX 15382, SPRINGFIELD, MA 01115-5382
PO BOX 15383, SPRINGFIELD, MA 01115-5383
PO BOX 15384, SPRINGFIELD, MA 01115-5384
PO BOX 15385, SPRINGFIELD, MA 01115-5385
PO BOX 15386, SPRINGFIELD, MA 01115-5386
PO BOX 15387, SPRINGFIELD, MA 01115-5387
PO BOX 15388, SPRINGFIELD, MA 01115-5388
PO BOX 15389, SPRINGFIELD, MA 01115-5389
PO BOX 15390, SPRINGFIELD, MA 01115-5390
PO BOX 15391, SPRINGFIELD, MA 01115-5391
PO BOX 15392, SPRINGFIELD, MA 01115-5392
PO BOX 15393, SPRINGFIELD, MA 01115-5393
PO BOX 15394, SPRINGFIELD, MA 01115-5394
PO BOX 15395, SPRINGFIELD, MA 01115-5395
PO BOX 15396, SPRINGFIELD, MA 01115-5396
PO BOX 15397, SPRINGFIELD, MA 01115-5397
PO BOX 15398, SPRINGFIELD, MA 01115-5398
PO BOX 15399, SPRINGFIELD, MA 01115-5399
PO BOX 15400, SPRINGFIELD, MA 01115-5400
PO BOX 15401, SPRINGFIELD, MA 01115-5401
PO BOX 15402, SPRINGFIELD, MA 01115-5402
PO BOX 15403, SPRINGFIELD, MA 01115-5403
PO BOX 15404, SPRINGFIELD, MA 01115-5404
PO BOX 15405, SPRINGFIELD, MA 01115-5405
PO BOX 15406, SPRINGFIELD, MA 01115-5406
PO BOX 15407, SPRINGFIELD, MA 01115-5407
PO BOX 15408, SPRINGFIELD, MA 01115-5408
PO BOX 15409, SPRINGFIELD, MA 01115-5409
PO BOX 15410, SPRINGFIELD, MA 01115-5410
PO BOX 15411, SPRINGFIELD, MA 01115-5411
PO BOX 15412, SPRINGFIELD, MA 01115-5412
PO BOX 15413, SPRINGFIELD, MA 01115-5413
PO BOX 15414, SPRINGFIELD, MA 01115-5414
PO BOX 15415, SPRINGFIELD, MA 01115-5415
PO BOX 15416, SPRINGFIELD, MA 01115-5416
PO BOX 15417, SPRINGFIELD, MA 01115-5417
PO BOX 15418, SPRINGFIELD, MA 01115-5418
PO BOX 15419, SPRINGFIELD, MA 01115-5419
PO BOX 15420, SPRINGFIELD, MA 01115-5420
PO BOX 15421, SPRINGFIELD, MA 01115-5421
PO BOX 15422, SPRINGFIELD, MA 01115-5422
PO BOX 15423, SPRINGFIELD, MA 01115-5423
PO BOX 15424, SPRINGFIELD, MA 01115-5424
PO BOX 15425, SPRINGFIELD, MA 01115-5425
PO BOX 15426, SPRINGFIELD, MA 01115-5426
PO BOX 15427, SPRINGFIELD, MA 01115-5427
PO BOX 15428, SPRINGFIELD, MA 01115-5428
PO BOX 15429, SPRINGFIELD, MA 01115-5429
PO BOX 15430, SPRINGFIELD, MA 01115-5430
PO BOX 15431, SPRINGFIELD, MA 01115-5431
PO BOX 15432, SPRINGFIELD, MA 01115-5432
PO BOX 15433, SPRINGFIELD, MA 01115-5433
PO BOX 15434, SPRINGFIELD, MA 01115-5434
PO BOX 15435, SPRINGFIELD, MA 01115-5435
PO BOX 15436, SPRINGFIELD, MA 01115-5436
PO BOX 15437, SPRINGFIELD, MA 01115-5437
PO BOX 15438, SPRINGFIELD, MA 01115-5438
PO BOX 15439, SPRINGFIELD, MA 01115-5439
PO BOX 15440, SPRINGFIELD, MA 01115-5440
PO BOX 15441, SPRINGFIELD, MA 01115-5441
PO BOX 15442, SPRINGFIELD, MA 01115-5442
PO BOX 15443, SPRINGFIELD, MA 01115-5443
PO BOX 15444, SPRINGFIELD, MA 01115-5444
PO BOX 15445, SPRINGFIELD, MA 01115-5445
PO BOX 15446, SPRINGFIELD, MA 01115-5446
PO BOX 15447, SPRINGFIELD, MA 01115-5447
PO BOX 15448, SPRINGFIELD, MA 01115-5448
PO BOX 15449, SPRINGFIELD, MA 01115-5449
PO BOX 15450, SPRINGFIELD, MA 01115-5450
PO BOX 15451, SPRINGFIELD, MA 01115-5451
PO BOX 15452, SPRINGFIELD, MA 01115-5452
PO BOX 15453, SPRINGFIELD, MA 01115-5453
PO BOX 15454, SPRINGFIELD, MA 01115-5454
PO BOX 15455, SPRINGFIELD, MA 01115-5455
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