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 181, MANNING, IA 51455-0181
PO BOX 182, MANNING, IA 51455-0182
PO BOX 183, MANNING, IA 51455-0183
PO BOX 184, MANNING, IA 51455-0184
PO BOX 185, MANNING, IA 51455-0185
PO BOX 186, MANNING, IA 51455-0186
PO BOX 187, MANNING, IA 51455-0187
PO BOX 188, MANNING, IA 51455-0188
PO BOX 189, MANNING, IA 51455-0189
PO BOX 190, MANNING, IA 51455-0190
PO BOX 191, MANNING, IA 51455-0191
PO BOX 192, MANNING, IA 51455-0192
PO BOX 193, MANNING, IA 51455-0193
PO BOX 194, MANNING, IA 51455-0194
PO BOX 195, MANNING, IA 51455-0195
PO BOX 196, MANNING, IA 51455-0196
PO BOX 197, MANNING, IA 51455-0197
PO BOX 198, MANNING, IA 51455-0198
PO BOX 199, MANNING, IA 51455-0199
PO BOX 200, MANNING, IA 51455-0200
PO BOX 201, MANNING, IA 51455-0201
PO BOX 202, MANNING, IA 51455-0202
PO BOX 203, MANNING, IA 51455-0203
PO BOX 204, MANNING, IA 51455-0204
PO BOX 205, MANNING, IA 51455-0205
PO BOX 206, MANNING, IA 51455-0206
PO BOX 207, MANNING, IA 51455-0207
PO BOX 208, MANNING, IA 51455-0208
PO BOX 209, MANNING, IA 51455-0209
PO BOX 210, MANNING, IA 51455-0210
PO BOX 211, MANNING, IA 51455-0211
PO BOX 212, MANNING, IA 51455-0212
PO BOX 213, MANNING, IA 51455-0213
PO BOX 214, MANNING, IA 51455-0214
PO BOX 215, MANNING, IA 51455-0215
PO BOX 216, MANNING, IA 51455-0216
PO BOX 217, MANNING, IA 51455-0217
PO BOX 218, MANNING, IA 51455-0218
PO BOX 219, MANNING, IA 51455-0219
PO BOX 220, MANNING, IA 51455-0220
PO BOX 221, MANNING, IA 51455-0221
PO BOX 222, MANNING, IA 51455-0222
PO BOX 223, MANNING, IA 51455-0223
PO BOX 224, MANNING, IA 51455-0224
PO BOX 225, MANNING, IA 51455-0225
PO BOX 226, MANNING, IA 51455-0226
PO BOX 227, MANNING, IA 51455-0227
PO BOX 228, MANNING, IA 51455-0228
PO BOX 229, MANNING, IA 51455-0229
PO BOX 230, MANNING, IA 51455-0230
PO BOX 231, MANNING, IA 51455-0231
PO BOX 232, MANNING, IA 51455-0232
PO BOX 233, MANNING, IA 51455-0233
PO BOX 234, MANNING, IA 51455-0234
PO BOX 235, MANNING, IA 51455-0235
PO BOX 236, MANNING, IA 51455-0236
PO BOX 237, MANNING, IA 51455-0237
PO BOX 238, MANNING, IA 51455-0238
PO BOX 239, MANNING, IA 51455-0239
PO BOX 240, MANNING, IA 51455-0240
PO BOX 241, MANNING, IA 51455-0241
PO BOX 242, MANNING, IA 51455-0242
PO BOX 243, MANNING, IA 51455-0243
PO BOX 244, MANNING, IA 51455-0244
PO BOX 245, MANNING, IA 51455-0245
PO BOX 246, MANNING, IA 51455-0246
PO BOX 247, MANNING, IA 51455-0247
PO BOX 248, MANNING, IA 51455-0248
PO BOX 249, MANNING, IA 51455-0249
PO BOX 250, MANNING, IA 51455-0250
PO BOX 251, MANNING, IA 51455-0251
PO BOX 252, MANNING, IA 51455-0252
PO BOX 253, MANNING, IA 51455-0253
PO BOX 254, MANNING, IA 51455-0254
PO BOX 255, MANNING, IA 51455-0255
PO BOX 256, MANNING, IA 51455-0256
PO BOX 257, MANNING, IA 51455-0257
PO BOX 258, MANNING, IA 51455-0258
PO BOX 259, MANNING, IA 51455-0259
PO BOX 260, MANNING, IA 51455-0260
PO BOX 261, MANNING, IA 51455-0261
PO BOX 262, MANNING, IA 51455-0262
PO BOX 263, MANNING, IA 51455-0263
PO BOX 264, MANNING, IA 51455-0264
PO BOX 265, MANNING, IA 51455-0265
PO BOX 266, MANNING, IA 51455-0266
PO BOX 267, MANNING, IA 51455-0267
PO BOX 268, MANNING, IA 51455-0268
PO BOX 269, MANNING, IA 51455-0269
PO BOX 270, MANNING, IA 51455-0270
PO BOX 271, MANNING, IA 51455-0271
PO BOX 272, MANNING, IA 51455-0272
PO BOX 273, MANNING, IA 51455-0273
PO BOX 274, MANNING, IA 51455-0274
PO BOX 275, MANNING, IA 51455-0275
PO BOX 276, MANNING, IA 51455-0276
PO BOX 277, MANNING, IA 51455-0277
PO BOX 278, MANNING, IA 51455-0278
PO BOX 279, MANNING, IA 51455-0279
PO BOX 280, MANNING, IA 51455-0280
PO BOX 281, MANNING, IA 51455-0281
PO BOX 282, MANNING, IA 51455-0282
PO BOX 283, MANNING, IA 51455-0283
PO BOX 284, MANNING, IA 51455-0284
PO BOX 285, MANNING, IA 51455-0285
PO BOX 286, MANNING, IA 51455-0286
PO BOX 287, MANNING, IA 51455-0287
PO BOX 288, MANNING, IA 51455-0288
PO BOX 289, MANNING, IA 51455-0289
PO BOX 290, MANNING, IA 51455-0290
PO BOX 291, MANNING, IA 51455-0291
PO BOX 292, MANNING, IA 51455-0292
PO BOX 293, MANNING, IA 51455-0293
PO BOX 294, MANNING, IA 51455-0294
PO BOX 295, MANNING, IA 51455-0295
PO BOX 296, MANNING, IA 51455-0296
PO BOX 297, MANNING, IA 51455-0297
PO BOX 298, MANNING, IA 51455-0298
PO BOX 299, MANNING, IA 51455-0299
PO BOX 300, MANNING, IA 51455-0300
PO BOX 301, MANNING, IA 51455-0301
PO BOX 302, MANNING, IA 51455-0302
PO BOX 303, MANNING, IA 51455-0303
PO BOX 304, MANNING, IA 51455-0304
PO BOX 305, MANNING, IA 51455-0305
PO BOX 306, MANNING, IA 51455-0306
PO BOX 307, MANNING, IA 51455-0307
PO BOX 308, MANNING, IA 51455-0308
PO BOX 309, MANNING, IA 51455-0309
PO BOX 310, MANNING, IA 51455-0310
PO BOX 311, MANNING, IA 51455-0311
PO BOX 312, MANNING, IA 51455-0312
PO BOX 313, MANNING, IA 51455-0313
PO BOX 314, MANNING, IA 51455-0314
PO BOX 315, MANNING, IA 51455-0315
PO BOX 316, MANNING, IA 51455-0316
PO BOX 317, MANNING, IA 51455-0317
PO BOX 318, MANNING, IA 51455-0318
PO BOX 319, MANNING, IA 51455-0319
PO BOX 320, MANNING, IA 51455-0320
PO BOX 321, MANNING, IA 51455-0321
PO BOX 322, MANNING, IA 51455-0322
PO BOX 323, MANNING, IA 51455-0323
PO BOX 324, MANNING, IA 51455-0324
PO BOX 325, MANNING, IA 51455-0325
PO BOX 326, MANNING, IA 51455-0326
PO BOX 327, MANNING, IA 51455-0327
PO BOX 328, MANNING, IA 51455-0328
PO BOX 329, MANNING, IA 51455-0329
PO BOX 330, MANNING, IA 51455-0330
PO BOX 331, MANNING, IA 51455-0331
PO BOX 332, MANNING, IA 51455-0332
PO BOX 333, MANNING, IA 51455-0333
PO BOX 334, MANNING, IA 51455-0334
PO BOX 335, MANNING, IA 51455-0335
PO BOX 336, MANNING, IA 51455-0336
PO BOX 337, MANNING, IA 51455-0337
PO BOX 338, MANNING, IA 51455-0338
PO BOX 339, MANNING, IA 51455-0339
PO BOX 340, MANNING, IA 51455-0340
PO BOX 341, MANNING, IA 51455-0341
PO BOX 342, MANNING, IA 51455-0342
PO BOX 343, MANNING, IA 51455-0343
PO BOX 344, MANNING, IA 51455-0344
PO BOX 345, MANNING, IA 51455-0345
PO BOX 346, MANNING, IA 51455-0346
PO BOX 347, MANNING, IA 51455-0347
PO BOX 348, MANNING, IA 51455-0348
PO BOX 349, MANNING, IA 51455-0349
PO BOX 350, MANNING, IA 51455-0350
PO BOX 351, MANNING, IA 51455-0351
PO BOX 352, MANNING, IA 51455-0352
PO BOX 353, MANNING, IA 51455-0353
PO BOX 354, MANNING, IA 51455-0354
PO BOX 355, MANNING, IA 51455-0355
PO BOX 356, MANNING, IA 51455-0356
PO BOX 357, MANNING, IA 51455-0357
PO BOX 358, MANNING, IA 51455-0358
PO BOX 359, MANNING, IA 51455-0359
PO BOX 360, MANNING, IA 51455-0360
PO BOX 361, MANNING, IA 51455-0361
PO BOX 362, MANNING, IA 51455-0362
PO BOX 363, MANNING, IA 51455-0363
PO BOX 364, MANNING, IA 51455-0364
PO BOX 365, MANNING, IA 51455-0365
PO BOX 366, MANNING, IA 51455-0366
PO BOX 367, MANNING, IA 51455-0367
PO BOX 368, MANNING, IA 51455-0368
PO BOX 369, MANNING, IA 51455-0369
PO BOX 370, MANNING, IA 51455-0370
PO BOX 371, MANNING, IA 51455-0371
PO BOX 372, MANNING, IA 51455-0372
PO BOX 373, MANNING, IA 51455-0373
PO BOX 374, MANNING, IA 51455-0374
PO BOX 375, MANNING, IA 51455-0375
PO BOX 376, MANNING, IA 51455-0376
PO BOX 377, MANNING, IA 51455-0377
PO BOX 378, MANNING, IA 51455-0378
PO BOX 379, MANNING, IA 51455-0379
PO BOX 380, MANNING, IA 51455-0380
PO BOX 381, MANNING, IA 51455-0381
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