Số PO BOX có thể nhỏ hơn hoặc nhiều hơn bốn chữ số. Đối với các hộp bưu điện, quy tắc chung là mỗi hộp có mã ZIP + 4 riêng.
Bốn chữ số cuối cùng thường là một trong những chữ số sau:
1. Số 0 cộng với ba chữ số cuối của số hộp (eg. PO BOX 1001, Los Angeles CA 90001-0001).
2. Bốn chữ số cuối cùng của số hộp (eg. PO BOX 9991, Twin Peaks CA 92391-9991).
3. Nếu số hộp có ít hơn bốn chữ số, thì đủ số 0 được thêm vào trước số hộp để tạo ra một số có bốn chữ số(eg. PO BOX 1, Shreveport LA 71161-0001).
Tuy nhiên, không có quy tắc thống nhất, mã zip cộng với bốn chỉ mang tính chất tham khảo, mã ZIP + 4 phải được tra cứu riêng cho từng ô trong trang web chính thức của USPS.
PO BOX 241, GLENWOOD SPRINGS, CO 81602-0241
PO BOX 242, GLENWOOD SPRINGS, CO 81602-0242
PO BOX 243, GLENWOOD SPRINGS, CO 81602-0243
PO BOX 244, GLENWOOD SPRINGS, CO 81602-0244
PO BOX 245, GLENWOOD SPRINGS, CO 81602-0245
PO BOX 246, GLENWOOD SPRINGS, CO 81602-0246
PO BOX 247, GLENWOOD SPRINGS, CO 81602-0247
PO BOX 248, GLENWOOD SPRINGS, CO 81602-0248
PO BOX 249, GLENWOOD SPRINGS, CO 81602-0249
PO BOX 250, GLENWOOD SPRINGS, CO 81602-0250
PO BOX 251, GLENWOOD SPRINGS, CO 81602-0251
PO BOX 252, GLENWOOD SPRINGS, CO 81602-0252
PO BOX 253, GLENWOOD SPRINGS, CO 81602-0253
PO BOX 254, GLENWOOD SPRINGS, CO 81602-0254
PO BOX 255, GLENWOOD SPRINGS, CO 81602-0255
PO BOX 256, GLENWOOD SPRINGS, CO 81602-0256
PO BOX 257, GLENWOOD SPRINGS, CO 81602-0257
PO BOX 258, GLENWOOD SPRINGS, CO 81602-0258
PO BOX 259, GLENWOOD SPRINGS, CO 81602-0259
PO BOX 260, GLENWOOD SPRINGS, CO 81602-0260
PO BOX 261, GLENWOOD SPRINGS, CO 81602-0261
PO BOX 262, GLENWOOD SPRINGS, CO 81602-0262
PO BOX 263, GLENWOOD SPRINGS, CO 81602-0263
PO BOX 264, GLENWOOD SPRINGS, CO 81602-0264
PO BOX 265, GLENWOOD SPRINGS, CO 81602-0265
PO BOX 266, GLENWOOD SPRINGS, CO 81602-0266
PO BOX 267, GLENWOOD SPRINGS, CO 81602-0267
PO BOX 268, GLENWOOD SPRINGS, CO 81602-0268
PO BOX 269, GLENWOOD SPRINGS, CO 81602-0269
PO BOX 270, GLENWOOD SPRINGS, CO 81602-0270
PO BOX 271, GLENWOOD SPRINGS, CO 81602-0271
PO BOX 272, GLENWOOD SPRINGS, CO 81602-0272
PO BOX 273, GLENWOOD SPRINGS, CO 81602-0273
PO BOX 274, GLENWOOD SPRINGS, CO 81602-0274
PO BOX 275, GLENWOOD SPRINGS, CO 81602-0275
PO BOX 276, GLENWOOD SPRINGS, CO 81602-0276
PO BOX 277, GLENWOOD SPRINGS, CO 81602-0277
PO BOX 278, GLENWOOD SPRINGS, CO 81602-0278
PO BOX 279, GLENWOOD SPRINGS, CO 81602-0279
PO BOX 280, GLENWOOD SPRINGS, CO 81602-0280
PO BOX 281, GLENWOOD SPRINGS, CO 81602-0281
PO BOX 282, GLENWOOD SPRINGS, CO 81602-0282
PO BOX 283, GLENWOOD SPRINGS, CO 81602-0283
PO BOX 284, GLENWOOD SPRINGS, CO 81602-0284
PO BOX 285, GLENWOOD SPRINGS, CO 81602-0285
PO BOX 286, GLENWOOD SPRINGS, CO 81602-0286
PO BOX 287, GLENWOOD SPRINGS, CO 81602-0287
PO BOX 288, GLENWOOD SPRINGS, CO 81602-0288
PO BOX 289, GLENWOOD SPRINGS, CO 81602-0289
PO BOX 290, GLENWOOD SPRINGS, CO 81602-0290
PO BOX 291, GLENWOOD SPRINGS, CO 81602-0291
PO BOX 292, GLENWOOD SPRINGS, CO 81602-0292
PO BOX 293, GLENWOOD SPRINGS, CO 81602-0293
PO BOX 294, GLENWOOD SPRINGS, CO 81602-0294
PO BOX 295, GLENWOOD SPRINGS, CO 81602-0295
PO BOX 296, GLENWOOD SPRINGS, CO 81602-0296
PO BOX 297, GLENWOOD SPRINGS, CO 81602-0297
PO BOX 298, GLENWOOD SPRINGS, CO 81602-0298
PO BOX 299, GLENWOOD SPRINGS, CO 81602-0299
PO BOX 300, GLENWOOD SPRINGS, CO 81602-0300
PO BOX 301, GLENWOOD SPRINGS, CO 81602-0301
PO BOX 302, GLENWOOD SPRINGS, CO 81602-0302
PO BOX 303, GLENWOOD SPRINGS, CO 81602-0303
PO BOX 304, GLENWOOD SPRINGS, CO 81602-0304
PO BOX 305, GLENWOOD SPRINGS, CO 81602-0305
PO BOX 306, GLENWOOD SPRINGS, CO 81602-0306
PO BOX 307, GLENWOOD SPRINGS, CO 81602-0307
PO BOX 308, GLENWOOD SPRINGS, CO 81602-0308
PO BOX 309, GLENWOOD SPRINGS, CO 81602-0309
PO BOX 310, GLENWOOD SPRINGS, CO 81602-0310
PO BOX 311, GLENWOOD SPRINGS, CO 81602-0311
PO BOX 312, GLENWOOD SPRINGS, CO 81602-0312
PO BOX 313, GLENWOOD SPRINGS, CO 81602-0313
PO BOX 314, GLENWOOD SPRINGS, CO 81602-0314
PO BOX 315, GLENWOOD SPRINGS, CO 81602-0315
PO BOX 316, GLENWOOD SPRINGS, CO 81602-0316
PO BOX 317, GLENWOOD SPRINGS, CO 81602-0317
PO BOX 318, GLENWOOD SPRINGS, CO 81602-0318
PO BOX 319, GLENWOOD SPRINGS, CO 81602-0319
PO BOX 320, GLENWOOD SPRINGS, CO 81602-0320
PO BOX 321, GLENWOOD SPRINGS, CO 81602-0321
PO BOX 322, GLENWOOD SPRINGS, CO 81602-0322
PO BOX 323, GLENWOOD SPRINGS, CO 81602-0323
PO BOX 324, GLENWOOD SPRINGS, CO 81602-0324
PO BOX 325, GLENWOOD SPRINGS, CO 81602-0325
PO BOX 326, GLENWOOD SPRINGS, CO 81602-0326
PO BOX 327, GLENWOOD SPRINGS, CO 81602-0327
PO BOX 328, GLENWOOD SPRINGS, CO 81602-0328
PO BOX 329, GLENWOOD SPRINGS, CO 81602-0329
PO BOX 330, GLENWOOD SPRINGS, CO 81602-0330
PO BOX 331, GLENWOOD SPRINGS, CO 81602-0331
PO BOX 332, GLENWOOD SPRINGS, CO 81602-0332
PO BOX 333, GLENWOOD SPRINGS, CO 81602-0333
PO BOX 334, GLENWOOD SPRINGS, CO 81602-0334
PO BOX 335, GLENWOOD SPRINGS, CO 81602-0335
PO BOX 336, GLENWOOD SPRINGS, CO 81602-0336
PO BOX 337, GLENWOOD SPRINGS, CO 81602-0337
PO BOX 338, GLENWOOD SPRINGS, CO 81602-0338
PO BOX 339, GLENWOOD SPRINGS, CO 81602-0339
PO BOX 340, GLENWOOD SPRINGS, CO 81602-0340
PO BOX 341, GLENWOOD SPRINGS, CO 81602-0341
PO BOX 342, GLENWOOD SPRINGS, CO 81602-0342
PO BOX 343, GLENWOOD SPRINGS, CO 81602-0343
PO BOX 344, GLENWOOD SPRINGS, CO 81602-0344
PO BOX 345, GLENWOOD SPRINGS, CO 81602-0345
PO BOX 346, GLENWOOD SPRINGS, CO 81602-0346
PO BOX 347, GLENWOOD SPRINGS, CO 81602-0347
PO BOX 348, GLENWOOD SPRINGS, CO 81602-0348
PO BOX 349, GLENWOOD SPRINGS, CO 81602-0349
PO BOX 350, GLENWOOD SPRINGS, CO 81602-0350
PO BOX 351, GLENWOOD SPRINGS, CO 81602-0351
PO BOX 352, GLENWOOD SPRINGS, CO 81602-0352
PO BOX 353, GLENWOOD SPRINGS, CO 81602-0353
PO BOX 354, GLENWOOD SPRINGS, CO 81602-0354
PO BOX 355, GLENWOOD SPRINGS, CO 81602-0355
PO BOX 356, GLENWOOD SPRINGS, CO 81602-0356
PO BOX 357, GLENWOOD SPRINGS, CO 81602-0357
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