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 101, SUMNER, IA 50674-0101
PO BOX 102, SUMNER, IA 50674-0102
PO BOX 103, SUMNER, IA 50674-0103
PO BOX 104, SUMNER, IA 50674-0104
PO BOX 105, SUMNER, IA 50674-0105
PO BOX 106, SUMNER, IA 50674-0106
PO BOX 107, SUMNER, IA 50674-0107
PO BOX 108, SUMNER, IA 50674-0108
PO BOX 109, SUMNER, IA 50674-0109
PO BOX 110, SUMNER, IA 50674-0110
PO BOX 111, SUMNER, IA 50674-0111
PO BOX 112, SUMNER, IA 50674-0112
PO BOX 113, SUMNER, IA 50674-0113
PO BOX 114, SUMNER, IA 50674-0114
PO BOX 115, SUMNER, IA 50674-0115
PO BOX 116, SUMNER, IA 50674-0116
PO BOX 117, SUMNER, IA 50674-0117
PO BOX 118, SUMNER, IA 50674-0118
PO BOX 119, SUMNER, IA 50674-0119
PO BOX 120, SUMNER, IA 50674-0120
PO BOX 121, SUMNER, IA 50674-0121
PO BOX 122, SUMNER, IA 50674-0122
PO BOX 123, SUMNER, IA 50674-0123
PO BOX 124, SUMNER, IA 50674-0124
PO BOX 125, SUMNER, IA 50674-0125
PO BOX 126, SUMNER, IA 50674-0126
PO BOX 127, SUMNER, IA 50674-0127
PO BOX 128, SUMNER, IA 50674-0128
PO BOX 129, SUMNER, IA 50674-0129
PO BOX 130, SUMNER, IA 50674-0130
PO BOX 131, SUMNER, IA 50674-0131
PO BOX 132, SUMNER, IA 50674-0132
PO BOX 133, SUMNER, IA 50674-0133
PO BOX 134, SUMNER, IA 50674-0134
PO BOX 135, SUMNER, IA 50674-0135
PO BOX 136, SUMNER, IA 50674-0136
PO BOX 137, SUMNER, IA 50674-0137
PO BOX 138, SUMNER, IA 50674-0138
PO BOX 139, SUMNER, IA 50674-0139
PO BOX 140, SUMNER, IA 50674-0140
PO BOX 141, SUMNER, IA 50674-0141
PO BOX 142, SUMNER, IA 50674-0142
PO BOX 143, SUMNER, IA 50674-0143
PO BOX 144, SUMNER, IA 50674-0144
PO BOX 145, SUMNER, IA 50674-0145
PO BOX 146, SUMNER, IA 50674-0146
PO BOX 147, SUMNER, IA 50674-0147
PO BOX 148, SUMNER, IA 50674-0148
PO BOX 149, SUMNER, IA 50674-0149
PO BOX 150, SUMNER, IA 50674-0150
PO BOX 151, SUMNER, IA 50674-0151
PO BOX 152, SUMNER, IA 50674-0152
PO BOX 153, SUMNER, IA 50674-0153
PO BOX 154, SUMNER, IA 50674-0154
PO BOX 155, SUMNER, IA 50674-0155
PO BOX 156, SUMNER, IA 50674-0156
PO BOX 157, SUMNER, IA 50674-0157
PO BOX 158, SUMNER, IA 50674-0158
PO BOX 159, SUMNER, IA 50674-0159
PO BOX 160, SUMNER, IA 50674-0160
PO BOX 161, SUMNER, IA 50674-0161
PO BOX 162, SUMNER, IA 50674-0162
PO BOX 163, SUMNER, IA 50674-0163
PO BOX 164, SUMNER, IA 50674-0164
PO BOX 165, SUMNER, IA 50674-0165
PO BOX 166, SUMNER, IA 50674-0166
PO BOX 167, SUMNER, IA 50674-0167
PO BOX 168, SUMNER, IA 50674-0168
PO BOX 169, SUMNER, IA 50674-0169
PO BOX 170, SUMNER, IA 50674-0170
PO BOX 171, SUMNER, IA 50674-0171
PO BOX 172, SUMNER, IA 50674-0172
PO BOX 173, SUMNER, IA 50674-0173
PO BOX 174, SUMNER, IA 50674-0174
PO BOX 175, SUMNER, IA 50674-0175
PO BOX 176, SUMNER, IA 50674-0176
PO BOX 177, SUMNER, IA 50674-0177
PO BOX 178, SUMNER, IA 50674-0178
PO BOX 179, SUMNER, IA 50674-0179
PO BOX 180, SUMNER, IA 50674-0180
PO BOX 181, SUMNER, IA 50674-0181
PO BOX 182, SUMNER, IA 50674-0182
PO BOX 183, SUMNER, IA 50674-0183
PO BOX 184, SUMNER, IA 50674-0184
PO BOX 185, SUMNER, IA 50674-0185
PO BOX 186, SUMNER, IA 50674-0186
PO BOX 187, SUMNER, IA 50674-0187
PO BOX 188, SUMNER, IA 50674-0188
PO BOX 189, SUMNER, IA 50674-0189
PO BOX 190, SUMNER, IA 50674-0190
PO BOX 191, SUMNER, IA 50674-0191
PO BOX 192, SUMNER, IA 50674-0192
PO BOX 193, SUMNER, IA 50674-0193
PO BOX 194, SUMNER, IA 50674-0194
PO BOX 195, SUMNER, IA 50674-0195
PO BOX 196, SUMNER, IA 50674-0196
PO BOX 197, SUMNER, IA 50674-0197
PO BOX 198, SUMNER, IA 50674-0198
PO BOX 199, SUMNER, IA 50674-0199
PO BOX 200, SUMNER, IA 50674-0200
PO BOX 201, SUMNER, IA 50674-0201
PO BOX 202, SUMNER, IA 50674-0202
PO BOX 203, SUMNER, IA 50674-0203
PO BOX 204, SUMNER, IA 50674-0204
PO BOX 205, SUMNER, IA 50674-0205
PO BOX 206, SUMNER, IA 50674-0206
PO BOX 207, SUMNER, IA 50674-0207
PO BOX 208, SUMNER, IA 50674-0208
PO BOX 209, SUMNER, IA 50674-0209
PO BOX 210, SUMNER, IA 50674-0210
PO BOX 211, SUMNER, IA 50674-0211
PO BOX 212, SUMNER, IA 50674-0212
PO BOX 213, SUMNER, IA 50674-0213
PO BOX 214, SUMNER, IA 50674-0214
PO BOX 215, SUMNER, IA 50674-0215
PO BOX 216, SUMNER, IA 50674-0216
PO BOX 217, SUMNER, IA 50674-0217
PO BOX 218, SUMNER, IA 50674-0218
PO BOX 219, SUMNER, IA 50674-0219
PO BOX 220, SUMNER, IA 50674-0220
PO BOX 221, SUMNER, IA 50674-0221
PO BOX 222, SUMNER, IA 50674-0222
PO BOX 223, SUMNER, IA 50674-0223
PO BOX 224, SUMNER, IA 50674-0224
PO BOX 225, SUMNER, IA 50674-0225
PO BOX 226, SUMNER, IA 50674-0226
PO BOX 227, SUMNER, IA 50674-0227
PO BOX 228, SUMNER, IA 50674-0228
PO BOX 229, SUMNER, IA 50674-0229
PO BOX 230, SUMNER, IA 50674-0230
PO BOX 231, SUMNER, IA 50674-0231
PO BOX 232, SUMNER, IA 50674-0232
PO BOX 233, SUMNER, IA 50674-0233
PO BOX 234, SUMNER, IA 50674-0234
PO BOX 235, SUMNER, IA 50674-0235
PO BOX 236, SUMNER, IA 50674-0236
PO BOX 237, SUMNER, IA 50674-0237
PO BOX 238, SUMNER, IA 50674-0238
PO BOX 239, SUMNER, IA 50674-0239
PO BOX 240, SUMNER, IA 50674-0240
PO BOX 241, SUMNER, IA 50674-0241
PO BOX 242, SUMNER, IA 50674-0242
PO BOX 243, SUMNER, IA 50674-0243
PO BOX 244, SUMNER, IA 50674-0244
PO BOX 245, SUMNER, IA 50674-0245
PO BOX 246, SUMNER, IA 50674-0246
PO BOX 247, SUMNER, IA 50674-0247
PO BOX 248, SUMNER, IA 50674-0248
PO BOX 249, SUMNER, IA 50674-0249
PO BOX 250, SUMNER, IA 50674-0250
PO BOX 251, SUMNER, IA 50674-0251
PO BOX 252, SUMNER, IA 50674-0252
PO BOX 253, SUMNER, IA 50674-0253
PO BOX 254, SUMNER, IA 50674-0254
PO BOX 255, SUMNER, IA 50674-0255
PO BOX 256, SUMNER, IA 50674-0256
PO BOX 257, SUMNER, IA 50674-0257
PO BOX 258, SUMNER, IA 50674-0258
PO BOX 259, SUMNER, IA 50674-0259
PO BOX 260, SUMNER, IA 50674-0260
PO BOX 261, SUMNER, IA 50674-0261
PO BOX 262, SUMNER, IA 50674-0262
PO BOX 263, SUMNER, IA 50674-0263
PO BOX 264, SUMNER, IA 50674-0264
PO BOX 265, SUMNER, IA 50674-0265
PO BOX 266, SUMNER, IA 50674-0266
PO BOX 267, SUMNER, IA 50674-0267
PO BOX 268, SUMNER, IA 50674-0268
PO BOX 269, SUMNER, IA 50674-0269
PO BOX 270, SUMNER, IA 50674-0270
PO BOX 271, SUMNER, IA 50674-0271
PO BOX 272, SUMNER, IA 50674-0272
PO BOX 273, SUMNER, IA 50674-0273
PO BOX 274, SUMNER, IA 50674-0274
PO BOX 275, SUMNER, IA 50674-0275
PO BOX 276, SUMNER, IA 50674-0276
PO BOX 277, SUMNER, IA 50674-0277
PO BOX 278, SUMNER, IA 50674-0278
PO BOX 279, SUMNER, IA 50674-0279
PO BOX 280, SUMNER, IA 50674-0280
PO BOX 281, SUMNER, IA 50674-0281
PO BOX 282, SUMNER, IA 50674-0282
PO BOX 283, SUMNER, IA 50674-0283
PO BOX 284, SUMNER, IA 50674-0284
PO BOX 285, SUMNER, IA 50674-0285
PO BOX 286, SUMNER, IA 50674-0286
PO BOX 287, SUMNER, IA 50674-0287
PO BOX 288, SUMNER, IA 50674-0288
PO BOX 289, SUMNER, IA 50674-0289
PO BOX 290, SUMNER, IA 50674-0290
PO BOX 291, SUMNER, IA 50674-0291
PO BOX 292, SUMNER, IA 50674-0292
PO BOX 293, SUMNER, IA 50674-0293
PO BOX 294, SUMNER, IA 50674-0294
PO BOX 295, SUMNER, IA 50674-0295
PO BOX 296, SUMNER, IA 50674-0296
PO BOX 297, SUMNER, IA 50674-0297
PO BOX 298, SUMNER, IA 50674-0298
PO BOX 299, SUMNER, IA 50674-0299
PO BOX 300, SUMNER, IA 50674-0300
PO BOX 301, SUMNER, IA 50674-0301
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