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 211, MOUNTAIN LAKES, NJ 07046-0211
PO BOX 212, MOUNTAIN LAKES, NJ 07046-0212
PO BOX 213, MOUNTAIN LAKES, NJ 07046-0213
PO BOX 214, MOUNTAIN LAKES, NJ 07046-0214
PO BOX 215, MOUNTAIN LAKES, NJ 07046-0215
PO BOX 216, MOUNTAIN LAKES, NJ 07046-0216
PO BOX 217, MOUNTAIN LAKES, NJ 07046-0217
PO BOX 218, MOUNTAIN LAKES, NJ 07046-0218
PO BOX 219, MOUNTAIN LAKES, NJ 07046-0219
PO BOX 220, MOUNTAIN LAKES, NJ 07046-0220
PO BOX 221, MOUNTAIN LAKES, NJ 07046-0221
PO BOX 222, MOUNTAIN LAKES, NJ 07046-0222
PO BOX 223, MOUNTAIN LAKES, NJ 07046-0223
PO BOX 224, MOUNTAIN LAKES, NJ 07046-0224
PO BOX 225, MOUNTAIN LAKES, NJ 07046-0225
PO BOX 226, MOUNTAIN LAKES, NJ 07046-0226
PO BOX 227, MOUNTAIN LAKES, NJ 07046-0227
PO BOX 228, MOUNTAIN LAKES, NJ 07046-0228
PO BOX 229, MOUNTAIN LAKES, NJ 07046-0229
PO BOX 230, MOUNTAIN LAKES, NJ 07046-0230
PO BOX 231, MOUNTAIN LAKES, NJ 07046-0231
PO BOX 232, MOUNTAIN LAKES, NJ 07046-0232
PO BOX 233, MOUNTAIN LAKES, NJ 07046-0233
PO BOX 234, MOUNTAIN LAKES, NJ 07046-0234
PO BOX 235, MOUNTAIN LAKES, NJ 07046-0235
PO BOX 236, MOUNTAIN LAKES, NJ 07046-0236
PO BOX 237, MOUNTAIN LAKES, NJ 07046-0237
PO BOX 238, MOUNTAIN LAKES, NJ 07046-0238
PO BOX 239, MOUNTAIN LAKES, NJ 07046-0239
PO BOX 240, MOUNTAIN LAKES, NJ 07046-0240
PO BOX 241, MOUNTAIN LAKES, NJ 07046-0241
PO BOX 242, MOUNTAIN LAKES, NJ 07046-0242
PO BOX 243, MOUNTAIN LAKES, NJ 07046-0243
PO BOX 244, MOUNTAIN LAKES, NJ 07046-0244
PO BOX 245, MOUNTAIN LAKES, NJ 07046-0245
PO BOX 246, MOUNTAIN LAKES, NJ 07046-0246
PO BOX 247, MOUNTAIN LAKES, NJ 07046-0247
PO BOX 248, MOUNTAIN LAKES, NJ 07046-0248
PO BOX 249, MOUNTAIN LAKES, NJ 07046-0249
PO BOX 250, MOUNTAIN LAKES, NJ 07046-0250
PO BOX 251, MOUNTAIN LAKES, NJ 07046-0251
PO BOX 252, MOUNTAIN LAKES, NJ 07046-0252
PO BOX 253, MOUNTAIN LAKES, NJ 07046-0253
PO BOX 254, MOUNTAIN LAKES, NJ 07046-0254
PO BOX 255, MOUNTAIN LAKES, NJ 07046-0255
PO BOX 256, MOUNTAIN LAKES, NJ 07046-0256
PO BOX 257, MOUNTAIN LAKES, NJ 07046-0257
PO BOX 258, MOUNTAIN LAKES, NJ 07046-0258
PO BOX 259, MOUNTAIN LAKES, NJ 07046-0259
PO BOX 260, MOUNTAIN LAKES, NJ 07046-0260
PO BOX 261, MOUNTAIN LAKES, NJ 07046-0261
PO BOX 262, MOUNTAIN LAKES, NJ 07046-0262
PO BOX 263, MOUNTAIN LAKES, NJ 07046-0263
PO BOX 264, MOUNTAIN LAKES, NJ 07046-0264
PO BOX 265, MOUNTAIN LAKES, NJ 07046-0265
PO BOX 266, MOUNTAIN LAKES, NJ 07046-0266
PO BOX 267, MOUNTAIN LAKES, NJ 07046-0267
PO BOX 268, MOUNTAIN LAKES, NJ 07046-0268
PO BOX 269, MOUNTAIN LAKES, NJ 07046-0269
PO BOX 270, MOUNTAIN LAKES, NJ 07046-0270
PO BOX 271, MOUNTAIN LAKES, NJ 07046-0271
PO BOX 272, MOUNTAIN LAKES, NJ 07046-0272
PO BOX 273, MOUNTAIN LAKES, NJ 07046-0273
PO BOX 274, MOUNTAIN LAKES, NJ 07046-0274
PO BOX 275, MOUNTAIN LAKES, NJ 07046-0275
PO BOX 276, MOUNTAIN LAKES, NJ 07046-0276
PO BOX 277, MOUNTAIN LAKES, NJ 07046-0277
PO BOX 278, MOUNTAIN LAKES, NJ 07046-0278
PO BOX 279, MOUNTAIN LAKES, NJ 07046-0279
PO BOX 280, MOUNTAIN LAKES, NJ 07046-0280
PO BOX 281, MOUNTAIN LAKES, NJ 07046-0281
PO BOX 282, MOUNTAIN LAKES, NJ 07046-0282
PO BOX 283, MOUNTAIN LAKES, NJ 07046-0283
PO BOX 284, MOUNTAIN LAKES, NJ 07046-0284
PO BOX 285, MOUNTAIN LAKES, NJ 07046-0285
PO BOX 286, MOUNTAIN LAKES, NJ 07046-0286
PO BOX 287, MOUNTAIN LAKES, NJ 07046-0287
PO BOX 288, MOUNTAIN LAKES, NJ 07046-0288
PO BOX 289, MOUNTAIN LAKES, NJ 07046-0289
PO BOX 290, MOUNTAIN LAKES, NJ 07046-0290
PO BOX 291, MOUNTAIN LAKES, NJ 07046-0291
PO BOX 292, MOUNTAIN LAKES, NJ 07046-0292
PO BOX 293, MOUNTAIN LAKES, NJ 07046-0293
PO BOX 294, MOUNTAIN LAKES, NJ 07046-0294
PO BOX 295, MOUNTAIN LAKES, NJ 07046-0295
PO BOX 296, MOUNTAIN LAKES, NJ 07046-0296
PO BOX 297, MOUNTAIN LAKES, NJ 07046-0297
PO BOX 298, MOUNTAIN LAKES, NJ 07046-0298
PO BOX 299, MOUNTAIN LAKES, NJ 07046-0299
PO BOX 300, MOUNTAIN LAKES, NJ 07046-0300
PO BOX 301, MOUNTAIN LAKES, NJ 07046-0301
PO BOX 302, MOUNTAIN LAKES, NJ 07046-0302
PO BOX 303, MOUNTAIN LAKES, NJ 07046-0303
PO BOX 304, MOUNTAIN LAKES, NJ 07046-0304
PO BOX 305, MOUNTAIN LAKES, NJ 07046-0305
PO BOX 306, MOUNTAIN LAKES, NJ 07046-0306
PO BOX 307, MOUNTAIN LAKES, NJ 07046-0307
PO BOX 308, MOUNTAIN LAKES, NJ 07046-0308
PO BOX 309, MOUNTAIN LAKES, NJ 07046-0309
PO BOX 310, MOUNTAIN LAKES, NJ 07046-0310
PO BOX 311, MOUNTAIN LAKES, NJ 07046-0311
PO BOX 312, MOUNTAIN LAKES, NJ 07046-0312
PO BOX 313, MOUNTAIN LAKES, NJ 07046-0313
PO BOX 314, MOUNTAIN LAKES, NJ 07046-0314
PO BOX 315, MOUNTAIN LAKES, NJ 07046-0315
PO BOX 316, MOUNTAIN LAKES, NJ 07046-0316
PO BOX 317, MOUNTAIN LAKES, NJ 07046-0317
PO BOX 318, MOUNTAIN LAKES, NJ 07046-0318
PO BOX 319, MOUNTAIN LAKES, NJ 07046-0319
PO BOX 320, MOUNTAIN LAKES, NJ 07046-0320
PO BOX 321, MOUNTAIN LAKES, NJ 07046-0321
PO BOX 322, MOUNTAIN LAKES, NJ 07046-0322
PO BOX 323, MOUNTAIN LAKES, NJ 07046-0323
PO BOX 324, MOUNTAIN LAKES, NJ 07046-0324
PO BOX 325, MOUNTAIN LAKES, NJ 07046-0325
PO BOX 326, MOUNTAIN LAKES, NJ 07046-0326
PO BOX 327, MOUNTAIN LAKES, NJ 07046-0327
PO BOX 328, MOUNTAIN LAKES, NJ 07046-0328
PO BOX 329, MOUNTAIN LAKES, NJ 07046-0329
PO BOX 330, MOUNTAIN LAKES, NJ 07046-0330
PO BOX 331, MOUNTAIN LAKES, NJ 07046-0331
PO BOX 332, MOUNTAIN LAKES, NJ 07046-0332
PO BOX 333, MOUNTAIN LAKES, NJ 07046-0333
PO BOX 334, MOUNTAIN LAKES, NJ 07046-0334
PO BOX 335, MOUNTAIN LAKES, NJ 07046-0335
PO BOX 336, MOUNTAIN LAKES, NJ 07046-0336
PO BOX 337, MOUNTAIN LAKES, NJ 07046-0337
PO BOX 338, MOUNTAIN LAKES, NJ 07046-0338
PO BOX 339, MOUNTAIN LAKES, NJ 07046-0339
PO BOX 340, MOUNTAIN LAKES, NJ 07046-0340
PO BOX 341, MOUNTAIN LAKES, NJ 07046-0341
PO BOX 342, MOUNTAIN LAKES, NJ 07046-0342
PO BOX 343, MOUNTAIN LAKES, NJ 07046-0343
PO BOX 344, MOUNTAIN LAKES, NJ 07046-0344
PO BOX 345, MOUNTAIN LAKES, NJ 07046-0345
PO BOX 346, MOUNTAIN LAKES, NJ 07046-0346
PO BOX 347, MOUNTAIN LAKES, NJ 07046-0347
PO BOX 348, MOUNTAIN LAKES, NJ 07046-0348
PO BOX 349, MOUNTAIN LAKES, NJ 07046-0349
PO BOX 350, MOUNTAIN LAKES, NJ 07046-0350
PO BOX 351, MOUNTAIN LAKES, NJ 07046-0351
PO BOX 352, MOUNTAIN LAKES, NJ 07046-0352
PO BOX 353, MOUNTAIN LAKES, NJ 07046-0353
PO BOX 354, MOUNTAIN LAKES, NJ 07046-0354
PO BOX 355, MOUNTAIN LAKES, NJ 07046-0355
PO BOX 356, MOUNTAIN LAKES, NJ 07046-0356
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