A PO BOX number can be less than or more than four digit. For post office boxes, the general rule is that each box has its own ZIP+4 code.
The last four digit is often one of the following:
1. Zero plus the last three digits of the box number (eg. PO BOX 1001, Los Angeles CA 90001-0001).
2. The last four digits of the box number (eg. PO BOX 9991, Twin Peaks CA 92391-9991).
3. If the box number is less than four digits, enough zeros prepended to the front of the box number to produce a four-digit number(eg. PO BOX 1, Shreveport LA 71161-0001).
However, there is no uniform rule, the zip code plus four is for reference only, the ZIP+4 code must be looked up individually for each box in the USPS offical website.
PO BOX 161, GLENWOOD, IA 51534-0161
PO BOX 162, GLENWOOD, IA 51534-0162
PO BOX 163, GLENWOOD, IA 51534-0163
PO BOX 164, GLENWOOD, IA 51534-0164
PO BOX 165, GLENWOOD, IA 51534-0165
PO BOX 166, GLENWOOD, IA 51534-0166
PO BOX 167, GLENWOOD, IA 51534-0167
PO BOX 168, GLENWOOD, IA 51534-0168
PO BOX 169, GLENWOOD, IA 51534-0169
PO BOX 170, GLENWOOD, IA 51534-0170
PO BOX 171, GLENWOOD, IA 51534-0171
PO BOX 172, GLENWOOD, IA 51534-0172
PO BOX 173, GLENWOOD, IA 51534-0173
PO BOX 174, GLENWOOD, IA 51534-0174
PO BOX 175, GLENWOOD, IA 51534-0175
PO BOX 176, GLENWOOD, IA 51534-0176
PO BOX 177, GLENWOOD, IA 51534-0177
PO BOX 178, GLENWOOD, IA 51534-0178
PO BOX 179, GLENWOOD, IA 51534-0179
PO BOX 180, GLENWOOD, IA 51534-0180
PO BOX 181, GLENWOOD, IA 51534-0181
PO BOX 182, GLENWOOD, IA 51534-0182
PO BOX 183, GLENWOOD, IA 51534-0183
PO BOX 184, GLENWOOD, IA 51534-0184
PO BOX 185, GLENWOOD, IA 51534-0185
PO BOX 186, GLENWOOD, IA 51534-0186
PO BOX 187, GLENWOOD, IA 51534-0187
PO BOX 188, GLENWOOD, IA 51534-0188
PO BOX 189, GLENWOOD, IA 51534-0189
PO BOX 190, GLENWOOD, IA 51534-0190
PO BOX 191, GLENWOOD, IA 51534-0191
PO BOX 192, GLENWOOD, IA 51534-0192
PO BOX 193, GLENWOOD, IA 51534-0193
PO BOX 194, GLENWOOD, IA 51534-0194
PO BOX 195, GLENWOOD, IA 51534-0195
PO BOX 196, GLENWOOD, IA 51534-0196
PO BOX 197, GLENWOOD, IA 51534-0197
PO BOX 198, GLENWOOD, IA 51534-0198
PO BOX 199, GLENWOOD, IA 51534-0199
PO BOX 200, GLENWOOD, IA 51534-0200
PO BOX 201, GLENWOOD, IA 51534-0201
PO BOX 202, GLENWOOD, IA 51534-0202
PO BOX 203, GLENWOOD, IA 51534-0203
PO BOX 204, GLENWOOD, IA 51534-0204
PO BOX 205, GLENWOOD, IA 51534-0205
PO BOX 206, GLENWOOD, IA 51534-0206
PO BOX 207, GLENWOOD, IA 51534-0207
PO BOX 208, GLENWOOD, IA 51534-0208
PO BOX 209, GLENWOOD, IA 51534-0209
PO BOX 210, GLENWOOD, IA 51534-0210
PO BOX 211, GLENWOOD, IA 51534-0211
PO BOX 212, GLENWOOD, IA 51534-0212
PO BOX 213, GLENWOOD, IA 51534-0213
PO BOX 214, GLENWOOD, IA 51534-0214
PO BOX 215, GLENWOOD, IA 51534-0215
PO BOX 216, GLENWOOD, IA 51534-0216
PO BOX 217, GLENWOOD, IA 51534-0217
PO BOX 218, GLENWOOD, IA 51534-0218
PO BOX 219, GLENWOOD, IA 51534-0219
PO BOX 220, GLENWOOD, IA 51534-0220
PO BOX 221, GLENWOOD, IA 51534-0221
PO BOX 222, GLENWOOD, IA 51534-0222
PO BOX 223, GLENWOOD, IA 51534-0223
PO BOX 224, GLENWOOD, IA 51534-0224
PO BOX 225, GLENWOOD, IA 51534-0225
PO BOX 226, GLENWOOD, IA 51534-0226
PO BOX 227, GLENWOOD, IA 51534-0227
PO BOX 228, GLENWOOD, IA 51534-0228
PO BOX 229, GLENWOOD, IA 51534-0229
PO BOX 230, GLENWOOD, IA 51534-0230
PO BOX 231, GLENWOOD, IA 51534-0231
PO BOX 232, GLENWOOD, IA 51534-0232
PO BOX 233, GLENWOOD, IA 51534-0233
PO BOX 234, GLENWOOD, IA 51534-0234
PO BOX 235, GLENWOOD, IA 51534-0235
PO BOX 236, GLENWOOD, IA 51534-0236
PO BOX 237, GLENWOOD, IA 51534-0237
PO BOX 238, GLENWOOD, IA 51534-0238
PO BOX 239, GLENWOOD, IA 51534-0239
PO BOX 240, GLENWOOD, IA 51534-0240
PO BOX 241, GLENWOOD, IA 51534-0241
PO BOX 242, GLENWOOD, IA 51534-0242
PO BOX 243, GLENWOOD, IA 51534-0243
PO BOX 244, GLENWOOD, IA 51534-0244
PO BOX 245, GLENWOOD, IA 51534-0245
PO BOX 246, GLENWOOD, IA 51534-0246
PO BOX 247, GLENWOOD, IA 51534-0247
PO BOX 248, GLENWOOD, IA 51534-0248
PO BOX 249, GLENWOOD, IA 51534-0249
PO BOX 250, GLENWOOD, IA 51534-0250
PO BOX 251, GLENWOOD, IA 51534-0251
PO BOX 252, GLENWOOD, IA 51534-0252
PO BOX 253, GLENWOOD, IA 51534-0253
PO BOX 254, GLENWOOD, IA 51534-0254
PO BOX 255, GLENWOOD, IA 51534-0255
PO BOX 256, GLENWOOD, IA 51534-0256
PO BOX 257, GLENWOOD, IA 51534-0257
PO BOX 258, GLENWOOD, IA 51534-0258
PO BOX 259, GLENWOOD, IA 51534-0259
PO BOX 260, GLENWOOD, IA 51534-0260
PO BOX 261, GLENWOOD, IA 51534-0261
PO BOX 262, GLENWOOD, IA 51534-0262
PO BOX 263, GLENWOOD, IA 51534-0263
PO BOX 264, GLENWOOD, IA 51534-0264
PO BOX 265, GLENWOOD, IA 51534-0265
PO BOX 266, GLENWOOD, IA 51534-0266
PO BOX 267, GLENWOOD, IA 51534-0267
PO BOX 268, GLENWOOD, IA 51534-0268
PO BOX 269, GLENWOOD, IA 51534-0269
PO BOX 270, GLENWOOD, IA 51534-0270
PO BOX 271, GLENWOOD, IA 51534-0271
PO BOX 272, GLENWOOD, IA 51534-0272
PO BOX 273, GLENWOOD, IA 51534-0273
PO BOX 274, GLENWOOD, IA 51534-0274
PO BOX 275, GLENWOOD, IA 51534-0275
PO BOX 276, GLENWOOD, IA 51534-0276
PO BOX 277, GLENWOOD, IA 51534-0277
PO BOX 278, GLENWOOD, IA 51534-0278
PO BOX 279, GLENWOOD, IA 51534-0279
PO BOX 280, GLENWOOD, IA 51534-0280
PO BOX 281, GLENWOOD, IA 51534-0281
PO BOX 282, GLENWOOD, IA 51534-0282
PO BOX 283, GLENWOOD, IA 51534-0283
PO BOX 284, GLENWOOD, IA 51534-0284
PO BOX 285, GLENWOOD, IA 51534-0285
PO BOX 286, GLENWOOD, IA 51534-0286
PO BOX 287, GLENWOOD, IA 51534-0287
PO BOX 288, GLENWOOD, IA 51534-0288
PO BOX 289, GLENWOOD, IA 51534-0289
PO BOX 290, GLENWOOD, IA 51534-0290
PO BOX 291, GLENWOOD, IA 51534-0291
PO BOX 292, GLENWOOD, IA 51534-0292
PO BOX 293, GLENWOOD, IA 51534-0293
PO BOX 294, GLENWOOD, IA 51534-0294
PO BOX 295, GLENWOOD, IA 51534-0295
PO BOX 296, GLENWOOD, IA 51534-0296
PO BOX 297, GLENWOOD, IA 51534-0297
PO BOX 298, GLENWOOD, IA 51534-0298
PO BOX 299, GLENWOOD, IA 51534-0299
PO BOX 300, GLENWOOD, IA 51534-0300
PO BOX 301, GLENWOOD, IA 51534-0301
PO BOX 302, GLENWOOD, IA 51534-0302
PO BOX 303, GLENWOOD, IA 51534-0303
PO BOX 304, GLENWOOD, IA 51534-0304
PO BOX 305, GLENWOOD, IA 51534-0305
PO BOX 306, GLENWOOD, IA 51534-0306
PO BOX 307, GLENWOOD, IA 51534-0307
PO BOX 308, GLENWOOD, IA 51534-0308
PO BOX 309, GLENWOOD, IA 51534-0309
PO BOX 310, GLENWOOD, IA 51534-0310
PO BOX 311, GLENWOOD, IA 51534-0311
PO BOX 312, GLENWOOD, IA 51534-0312
PO BOX 313, GLENWOOD, IA 51534-0313
PO BOX 314, GLENWOOD, IA 51534-0314
PO BOX 315, GLENWOOD, IA 51534-0315
PO BOX 316, GLENWOOD, IA 51534-0316
PO BOX 317, GLENWOOD, IA 51534-0317
PO BOX 318, GLENWOOD, IA 51534-0318
PO BOX 319, GLENWOOD, IA 51534-0319
PO BOX 320, GLENWOOD, IA 51534-0320
PO BOX 321, GLENWOOD, IA 51534-0321
PO BOX 322, GLENWOOD, IA 51534-0322
PO BOX 323, GLENWOOD, IA 51534-0323
PO BOX 324, GLENWOOD, IA 51534-0324
PO BOX 325, GLENWOOD, IA 51534-0325
PO BOX 326, GLENWOOD, IA 51534-0326
PO BOX 327, GLENWOOD, IA 51534-0327
PO BOX 328, GLENWOOD, IA 51534-0328
PO BOX 329, GLENWOOD, IA 51534-0329
PO BOX 330, GLENWOOD, IA 51534-0330
PO BOX 331, GLENWOOD, IA 51534-0331
PO BOX 332, GLENWOOD, IA 51534-0332
PO BOX 333, GLENWOOD, IA 51534-0333
PO BOX 334, GLENWOOD, IA 51534-0334
PO BOX 335, GLENWOOD, IA 51534-0335
PO BOX 336, GLENWOOD, IA 51534-0336
PO BOX 337, GLENWOOD, IA 51534-0337
PO BOX 338, GLENWOOD, IA 51534-0338
PO BOX 339, GLENWOOD, IA 51534-0339
PO BOX 340, GLENWOOD, IA 51534-0340
PO BOX 341, GLENWOOD, IA 51534-0341
PO BOX 342, GLENWOOD, IA 51534-0342
PO BOX 343, GLENWOOD, IA 51534-0343
PO BOX 344, GLENWOOD, IA 51534-0344
PO BOX 345, GLENWOOD, IA 51534-0345
PO BOX 346, GLENWOOD, IA 51534-0346
PO BOX 347, GLENWOOD, IA 51534-0347
PO BOX 348, GLENWOOD, IA 51534-0348
PO BOX 349, GLENWOOD, IA 51534-0349
PO BOX 350, GLENWOOD, IA 51534-0350
PO BOX 351, GLENWOOD, IA 51534-0351
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