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 151, SCRANTON, IA 51462-0151
PO BOX 152, SCRANTON, IA 51462-0152
PO BOX 153, SCRANTON, IA 51462-0153
PO BOX 154, SCRANTON, IA 51462-0154
PO BOX 155, SCRANTON, IA 51462-0155
PO BOX 156, SCRANTON, IA 51462-0156
PO BOX 157, SCRANTON, IA 51462-0157
PO BOX 158, SCRANTON, IA 51462-0158
PO BOX 159, SCRANTON, IA 51462-0159
PO BOX 160, SCRANTON, IA 51462-0160
PO BOX 161, SCRANTON, IA 51462-0161
PO BOX 162, SCRANTON, IA 51462-0162
PO BOX 163, SCRANTON, IA 51462-0163
PO BOX 164, SCRANTON, IA 51462-0164
PO BOX 165, SCRANTON, IA 51462-0165
PO BOX 166, SCRANTON, IA 51462-0166
PO BOX 167, SCRANTON, IA 51462-0167
PO BOX 168, SCRANTON, IA 51462-0168
PO BOX 169, SCRANTON, IA 51462-0169
PO BOX 170, SCRANTON, IA 51462-0170
PO BOX 171, SCRANTON, IA 51462-0171
PO BOX 172, SCRANTON, IA 51462-0172
PO BOX 173, SCRANTON, IA 51462-0173
PO BOX 174, SCRANTON, IA 51462-0174
PO BOX 175, SCRANTON, IA 51462-0175
PO BOX 176, SCRANTON, IA 51462-0176
PO BOX 177, SCRANTON, IA 51462-0177
PO BOX 178, SCRANTON, IA 51462-0178
PO BOX 179, SCRANTON, IA 51462-0179
PO BOX 180, SCRANTON, IA 51462-0180
PO BOX 181, SCRANTON, IA 51462-0181
PO BOX 182, SCRANTON, IA 51462-0182
PO BOX 183, SCRANTON, IA 51462-0183
PO BOX 184, SCRANTON, IA 51462-0184
PO BOX 185, SCRANTON, IA 51462-0185
PO BOX 186, SCRANTON, IA 51462-0186
PO BOX 187, SCRANTON, IA 51462-0187
PO BOX 188, SCRANTON, IA 51462-0188
PO BOX 189, SCRANTON, IA 51462-0189
PO BOX 190, SCRANTON, IA 51462-0190
PO BOX 191, SCRANTON, IA 51462-0191
PO BOX 192, SCRANTON, IA 51462-0192
PO BOX 193, SCRANTON, IA 51462-0193
PO BOX 194, SCRANTON, IA 51462-0194
PO BOX 195, SCRANTON, IA 51462-0195
PO BOX 196, SCRANTON, IA 51462-0196
PO BOX 197, SCRANTON, IA 51462-0197
PO BOX 198, SCRANTON, IA 51462-0198
PO BOX 199, SCRANTON, IA 51462-0199
PO BOX 200, SCRANTON, IA 51462-0200
PO BOX 201, SCRANTON, IA 51462-0201
PO BOX 202, SCRANTON, IA 51462-0202
PO BOX 203, SCRANTON, IA 51462-0203
PO BOX 204, SCRANTON, IA 51462-0204
PO BOX 205, SCRANTON, IA 51462-0205
PO BOX 206, SCRANTON, IA 51462-0206
PO BOX 207, SCRANTON, IA 51462-0207
PO BOX 208, SCRANTON, IA 51462-0208
PO BOX 209, SCRANTON, IA 51462-0209
PO BOX 210, SCRANTON, IA 51462-0210
PO BOX 211, SCRANTON, IA 51462-0211
PO BOX 212, SCRANTON, IA 51462-0212
PO BOX 213, SCRANTON, IA 51462-0213
PO BOX 214, SCRANTON, IA 51462-0214
PO BOX 215, SCRANTON, IA 51462-0215
PO BOX 216, SCRANTON, IA 51462-0216
PO BOX 217, SCRANTON, IA 51462-0217
PO BOX 218, SCRANTON, IA 51462-0218
PO BOX 219, SCRANTON, IA 51462-0219
PO BOX 220, SCRANTON, IA 51462-0220
PO BOX 221, SCRANTON, IA 51462-0221
PO BOX 222, SCRANTON, IA 51462-0222
PO BOX 223, SCRANTON, IA 51462-0223
PO BOX 224, SCRANTON, IA 51462-0224
PO BOX 225, SCRANTON, IA 51462-0225
PO BOX 226, SCRANTON, IA 51462-0226
PO BOX 227, SCRANTON, IA 51462-0227
PO BOX 228, SCRANTON, IA 51462-0228
PO BOX 229, SCRANTON, IA 51462-0229
PO BOX 230, SCRANTON, IA 51462-0230
PO BOX 231, SCRANTON, IA 51462-0231
PO BOX 232, SCRANTON, IA 51462-0232
PO BOX 233, SCRANTON, IA 51462-0233
PO BOX 234, SCRANTON, IA 51462-0234
PO BOX 235, SCRANTON, IA 51462-0235
PO BOX 236, SCRANTON, IA 51462-0236
PO BOX 237, SCRANTON, IA 51462-0237
PO BOX 238, SCRANTON, IA 51462-0238
PO BOX 239, SCRANTON, IA 51462-0239
PO BOX 240, SCRANTON, IA 51462-0240
PO BOX 241, SCRANTON, IA 51462-0241
PO BOX 242, SCRANTON, IA 51462-0242
PO BOX 243, SCRANTON, IA 51462-0243
PO BOX 244, SCRANTON, IA 51462-0244
PO BOX 245, SCRANTON, IA 51462-0245
PO BOX 246, SCRANTON, IA 51462-0246
PO BOX 247, SCRANTON, IA 51462-0247
PO BOX 248, SCRANTON, IA 51462-0248
PO BOX 249, SCRANTON, IA 51462-0249
PO BOX 250, SCRANTON, IA 51462-0250
PO BOX 251, SCRANTON, IA 51462-0251
PO BOX 252, SCRANTON, IA 51462-0252
PO BOX 253, SCRANTON, IA 51462-0253
PO BOX 254, SCRANTON, IA 51462-0254
PO BOX 255, SCRANTON, IA 51462-0255
PO BOX 256, SCRANTON, IA 51462-0256
PO BOX 257, SCRANTON, IA 51462-0257
PO BOX 258, SCRANTON, IA 51462-0258
PO BOX 259, SCRANTON, IA 51462-0259
PO BOX 260, SCRANTON, IA 51462-0260
PO BOX 261, SCRANTON, IA 51462-0261
PO BOX 262, SCRANTON, IA 51462-0262
PO BOX 263, SCRANTON, IA 51462-0263
PO BOX 264, SCRANTON, IA 51462-0264
PO BOX 265, SCRANTON, IA 51462-0265
PO BOX 266, SCRANTON, IA 51462-0266
PO BOX 267, SCRANTON, IA 51462-0267
PO BOX 268, SCRANTON, IA 51462-0268
PO BOX 269, SCRANTON, IA 51462-0269
PO BOX 270, SCRANTON, IA 51462-0270
PO BOX 271, SCRANTON, IA 51462-0271
PO BOX 272, SCRANTON, IA 51462-0272
PO BOX 273, SCRANTON, IA 51462-0273
PO BOX 274, SCRANTON, IA 51462-0274
PO BOX 275, SCRANTON, IA 51462-0275
PO BOX 276, SCRANTON, IA 51462-0276
PO BOX 277, SCRANTON, IA 51462-0277
PO BOX 278, SCRANTON, IA 51462-0278
PO BOX 279, SCRANTON, IA 51462-0279
PO BOX 280, SCRANTON, IA 51462-0280
PO BOX 281, SCRANTON, IA 51462-0281
PO BOX 282, SCRANTON, IA 51462-0282
PO BOX 283, SCRANTON, IA 51462-0283
PO BOX 284, SCRANTON, IA 51462-0284
PO BOX 285, SCRANTON, IA 51462-0285
PO BOX 286, SCRANTON, IA 51462-0286
PO BOX 287, SCRANTON, IA 51462-0287
PO BOX 288, SCRANTON, IA 51462-0288
PO BOX 289, SCRANTON, IA 51462-0289
PO BOX 290, SCRANTON, IA 51462-0290
PO BOX 291, SCRANTON, IA 51462-0291
PO BOX 292, SCRANTON, IA 51462-0292
PO BOX 293, SCRANTON, IA 51462-0293
PO BOX 294, SCRANTON, IA 51462-0294
PO BOX 295, SCRANTON, IA 51462-0295
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