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 141, BAYARD, IA 50029-0141
PO BOX 142, BAYARD, IA 50029-0142
PO BOX 143, BAYARD, IA 50029-0143
PO BOX 144, BAYARD, IA 50029-0144
PO BOX 145, BAYARD, IA 50029-0145
PO BOX 146, BAYARD, IA 50029-0146
PO BOX 147, BAYARD, IA 50029-0147
PO BOX 148, BAYARD, IA 50029-0148
PO BOX 149, BAYARD, IA 50029-0149
PO BOX 150, BAYARD, IA 50029-0150
PO BOX 151, BAYARD, IA 50029-0151
PO BOX 152, BAYARD, IA 50029-0152
PO BOX 153, BAYARD, IA 50029-0153
PO BOX 154, BAYARD, IA 50029-0154
PO BOX 155, BAYARD, IA 50029-0155
PO BOX 156, BAYARD, IA 50029-0156
PO BOX 157, BAYARD, IA 50029-0157
PO BOX 158, BAYARD, IA 50029-0158
PO BOX 159, BAYARD, IA 50029-0159
PO BOX 160, BAYARD, IA 50029-0160
PO BOX 161, BAYARD, IA 50029-0161
PO BOX 162, BAYARD, IA 50029-0162
PO BOX 163, BAYARD, IA 50029-0163
PO BOX 164, BAYARD, IA 50029-0164
PO BOX 165, BAYARD, IA 50029-0165
PO BOX 166, BAYARD, IA 50029-0166
PO BOX 167, BAYARD, IA 50029-0167
PO BOX 168, BAYARD, IA 50029-0168
PO BOX 169, BAYARD, IA 50029-0169
PO BOX 170, BAYARD, IA 50029-0170
PO BOX 171, BAYARD, IA 50029-0171
PO BOX 172, BAYARD, IA 50029-0172
PO BOX 173, BAYARD, IA 50029-0173
PO BOX 174, BAYARD, IA 50029-0174
PO BOX 175, BAYARD, IA 50029-0175
PO BOX 176, BAYARD, IA 50029-0176
PO BOX 177, BAYARD, IA 50029-0177
PO BOX 178, BAYARD, IA 50029-0178
PO BOX 179, BAYARD, IA 50029-0179
PO BOX 180, BAYARD, IA 50029-0180
PO BOX 181, BAYARD, IA 50029-0181
PO BOX 182, BAYARD, IA 50029-0182
PO BOX 183, BAYARD, IA 50029-0183
PO BOX 184, BAYARD, IA 50029-0184
PO BOX 185, BAYARD, IA 50029-0185
PO BOX 186, BAYARD, IA 50029-0186
PO BOX 187, BAYARD, IA 50029-0187
PO BOX 188, BAYARD, IA 50029-0188
PO BOX 189, BAYARD, IA 50029-0189
PO BOX 190, BAYARD, IA 50029-0190
PO BOX 191, BAYARD, IA 50029-0191
PO BOX 192, BAYARD, IA 50029-0192
PO BOX 193, BAYARD, IA 50029-0193
PO BOX 194, BAYARD, IA 50029-0194
PO BOX 195, BAYARD, IA 50029-0195
PO BOX 196, BAYARD, IA 50029-0196
PO BOX 197, BAYARD, IA 50029-0197
PO BOX 198, BAYARD, IA 50029-0198
PO BOX 199, BAYARD, IA 50029-0199
PO BOX 200, BAYARD, IA 50029-0200
PO BOX 201, BAYARD, IA 50029-0201
PO BOX 202, BAYARD, IA 50029-0202
PO BOX 203, BAYARD, IA 50029-0203
PO BOX 204, BAYARD, IA 50029-0204
PO BOX 205, BAYARD, IA 50029-0205
PO BOX 206, BAYARD, IA 50029-0206
PO BOX 207, BAYARD, IA 50029-0207
PO BOX 208, BAYARD, IA 50029-0208
PO BOX 209, BAYARD, IA 50029-0209
PO BOX 210, BAYARD, IA 50029-0210
PO BOX 211, BAYARD, IA 50029-0211
PO BOX 212, BAYARD, IA 50029-0212
PO BOX 213, BAYARD, IA 50029-0213
PO BOX 214, BAYARD, IA 50029-0214
PO BOX 215, BAYARD, IA 50029-0215
PO BOX 216, BAYARD, IA 50029-0216
PO BOX 217, BAYARD, IA 50029-0217
PO BOX 218, BAYARD, IA 50029-0218
PO BOX 219, BAYARD, IA 50029-0219
PO BOX 220, BAYARD, IA 50029-0220
PO BOX 221, BAYARD, IA 50029-0221
PO BOX 222, BAYARD, IA 50029-0222
PO BOX 223, BAYARD, IA 50029-0223
PO BOX 224, BAYARD, IA 50029-0224
PO BOX 225, BAYARD, IA 50029-0225
PO BOX 226, BAYARD, IA 50029-0226
PO BOX 227, BAYARD, IA 50029-0227
PO BOX 228, BAYARD, IA 50029-0228
PO BOX 229, BAYARD, IA 50029-0229
PO BOX 230, BAYARD, IA 50029-0230
PO BOX 231, BAYARD, IA 50029-0231
PO BOX 232, BAYARD, IA 50029-0232
PO BOX 233, BAYARD, IA 50029-0233
PO BOX 234, BAYARD, IA 50029-0234
PO BOX 235, BAYARD, IA 50029-0235
PO BOX 236, BAYARD, IA 50029-0236
PO BOX 237, BAYARD, IA 50029-0237
PO BOX 238, BAYARD, IA 50029-0238
PO BOX 239, BAYARD, IA 50029-0239
PO BOX 240, BAYARD, IA 50029-0240
PO BOX 241, BAYARD, IA 50029-0241
PO BOX 242, BAYARD, IA 50029-0242
PO BOX 243, BAYARD, IA 50029-0243
PO BOX 244, BAYARD, IA 50029-0244
PO BOX 245, BAYARD, IA 50029-0245
PO BOX 246, BAYARD, IA 50029-0246
PO BOX 247, BAYARD, IA 50029-0247
PO BOX 248, BAYARD, IA 50029-0248
PO BOX 249, BAYARD, IA 50029-0249
PO BOX 250, BAYARD, IA 50029-0250
PO BOX 251, BAYARD, IA 50029-0251
PO BOX 252, BAYARD, IA 50029-0252
PO BOX 253, BAYARD, IA 50029-0253
PO BOX 254, BAYARD, IA 50029-0254
PO BOX 255, BAYARD, IA 50029-0255
PO BOX 256, BAYARD, IA 50029-0256
PO BOX 257, BAYARD, IA 50029-0257
PO BOX 258, BAYARD, IA 50029-0258
PO BOX 259, BAYARD, IA 50029-0259
PO BOX 260, BAYARD, IA 50029-0260
PO BOX 261, BAYARD, IA 50029-0261
PO BOX 262, BAYARD, IA 50029-0262
PO BOX 263, BAYARD, IA 50029-0263
PO BOX 264, BAYARD, IA 50029-0264
PO BOX 265, BAYARD, IA 50029-0265
PO BOX 266, BAYARD, IA 50029-0266
PO BOX 267, BAYARD, IA 50029-0267
PO BOX 268, BAYARD, IA 50029-0268
PO BOX 269, BAYARD, IA 50029-0269
PO BOX 270, BAYARD, IA 50029-0270
PO BOX 271, BAYARD, IA 50029-0271
PO BOX 272, BAYARD, IA 50029-0272
PO BOX 273, BAYARD, IA 50029-0273
PO BOX 274, BAYARD, IA 50029-0274
PO BOX 275, BAYARD, IA 50029-0275
PO BOX 276, BAYARD, IA 50029-0276
PO BOX 277, BAYARD, IA 50029-0277
PO BOX 278, BAYARD, IA 50029-0278
PO BOX 279, BAYARD, IA 50029-0279
PO BOX 280, BAYARD, IA 50029-0280
PO BOX 281, BAYARD, IA 50029-0281
PO BOX 282, BAYARD, IA 50029-0282
PO BOX 283, BAYARD, IA 50029-0283
PO BOX 284, BAYARD, IA 50029-0284
PO BOX 285, BAYARD, IA 50029-0285
PO BOX 286, BAYARD, IA 50029-0286
PO BOX 287, BAYARD, IA 50029-0287
PO BOX 288, BAYARD, IA 50029-0288
PO BOX 289, BAYARD, IA 50029-0289
PO BOX 290, BAYARD, IA 50029-0290
PO BOX 291, BAYARD, IA 50029-0291
PO BOX 292, BAYARD, IA 50029-0292
PO BOX 293, BAYARD, IA 50029-0293
PO BOX 294, BAYARD, IA 50029-0294
PO BOX 295, BAYARD, IA 50029-0295
PO BOX 296, BAYARD, IA 50029-0296
PO BOX 297, BAYARD, IA 50029-0297
PO BOX 298, BAYARD, IA 50029-0298
PO BOX 299, BAYARD, IA 50029-0299
PO BOX 300, BAYARD, IA 50029-0300
PO BOX 301, BAYARD, IA 50029-0301
PO BOX 302, BAYARD, IA 50029-0302
PO BOX 303, BAYARD, IA 50029-0303
PO BOX 304, BAYARD, IA 50029-0304
PO BOX 305, BAYARD, IA 50029-0305
PO BOX 306, BAYARD, IA 50029-0306
PO BOX 307, BAYARD, IA 50029-0307
PO BOX 308, BAYARD, IA 50029-0308
PO BOX 309, BAYARD, IA 50029-0309
PO BOX 310, BAYARD, IA 50029-0310
PO BOX 311, BAYARD, IA 50029-0311
PO BOX 312, BAYARD, IA 50029-0312
PO BOX 313, BAYARD, IA 50029-0313
PO BOX 314, BAYARD, IA 50029-0314
PO BOX 315, BAYARD, IA 50029-0315
PO BOX 316, BAYARD, IA 50029-0316
PO BOX 317, BAYARD, IA 50029-0317
PO BOX 318, BAYARD, IA 50029-0318
PO BOX 319, BAYARD, IA 50029-0319
PO BOX 320, BAYARD, IA 50029-0320
PO BOX 321, BAYARD, IA 50029-0321
PO BOX 322, BAYARD, IA 50029-0322
PO BOX 323, BAYARD, IA 50029-0323
PO BOX 324, BAYARD, IA 50029-0324
PO BOX 325, BAYARD, IA 50029-0325
PO BOX 326, BAYARD, IA 50029-0326
PO BOX 327, BAYARD, IA 50029-0327
PO BOX 328, BAYARD, IA 50029-0328
PO BOX 329, BAYARD, IA 50029-0329
PO BOX 330, BAYARD, IA 50029-0330
PO BOX 331, BAYARD, IA 50029-0331
PO BOX 332, BAYARD, IA 50029-0332
PO BOX 333, BAYARD, IA 50029-0333
PO BOX 334, BAYARD, IA 50029-0334
PO BOX 335, BAYARD, IA 50029-0335
PO BOX 336, BAYARD, IA 50029-0336
PO BOX 337, BAYARD, IA 50029-0337
PO BOX 338, BAYARD, IA 50029-0338
PO BOX 339, BAYARD, IA 50029-0339
PO BOX 340, BAYARD, IA 50029-0340
PO BOX 341, BAYARD, IA 50029-0341
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