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, CAMBRIDGE, IA 50046-0101
PO BOX 102, CAMBRIDGE, IA 50046-0102
PO BOX 103, CAMBRIDGE, IA 50046-0103
PO BOX 104, CAMBRIDGE, IA 50046-0104
PO BOX 105, CAMBRIDGE, IA 50046-0105
PO BOX 106, CAMBRIDGE, IA 50046-0106
PO BOX 107, CAMBRIDGE, IA 50046-0107
PO BOX 108, CAMBRIDGE, IA 50046-0108
PO BOX 109, CAMBRIDGE, IA 50046-0109
PO BOX 110, CAMBRIDGE, IA 50046-0110
PO BOX 111, CAMBRIDGE, IA 50046-0111
PO BOX 112, CAMBRIDGE, IA 50046-0112
PO BOX 113, CAMBRIDGE, IA 50046-0113
PO BOX 114, CAMBRIDGE, IA 50046-0114
PO BOX 115, CAMBRIDGE, IA 50046-0115
PO BOX 116, CAMBRIDGE, IA 50046-0116
PO BOX 117, CAMBRIDGE, IA 50046-0117
PO BOX 118, CAMBRIDGE, IA 50046-0118
PO BOX 119, CAMBRIDGE, IA 50046-0119
PO BOX 120, CAMBRIDGE, IA 50046-0120
PO BOX 121, CAMBRIDGE, IA 50046-0121
PO BOX 122, CAMBRIDGE, IA 50046-0122
PO BOX 123, CAMBRIDGE, IA 50046-0123
PO BOX 124, CAMBRIDGE, IA 50046-0124
PO BOX 125, CAMBRIDGE, IA 50046-0125
PO BOX 126, CAMBRIDGE, IA 50046-0126
PO BOX 127, CAMBRIDGE, IA 50046-0127
PO BOX 128, CAMBRIDGE, IA 50046-0128
PO BOX 129, CAMBRIDGE, IA 50046-0129
PO BOX 130, CAMBRIDGE, IA 50046-0130
PO BOX 131, CAMBRIDGE, IA 50046-0131
PO BOX 132, CAMBRIDGE, IA 50046-0132
PO BOX 133, CAMBRIDGE, IA 50046-0133
PO BOX 134, CAMBRIDGE, IA 50046-0134
PO BOX 135, CAMBRIDGE, IA 50046-0135
PO BOX 136, CAMBRIDGE, IA 50046-0136
PO BOX 137, CAMBRIDGE, IA 50046-0137
PO BOX 138, CAMBRIDGE, IA 50046-0138
PO BOX 139, CAMBRIDGE, IA 50046-0139
PO BOX 140, CAMBRIDGE, IA 50046-0140
PO BOX 141, CAMBRIDGE, IA 50046-0141
PO BOX 142, CAMBRIDGE, IA 50046-0142
PO BOX 143, CAMBRIDGE, IA 50046-0143
PO BOX 144, CAMBRIDGE, IA 50046-0144
PO BOX 145, CAMBRIDGE, IA 50046-0145
PO BOX 146, CAMBRIDGE, IA 50046-0146
PO BOX 147, CAMBRIDGE, IA 50046-0147
PO BOX 148, CAMBRIDGE, IA 50046-0148
PO BOX 149, CAMBRIDGE, IA 50046-0149
PO BOX 150, CAMBRIDGE, IA 50046-0150
PO BOX 151, CAMBRIDGE, IA 50046-0151
PO BOX 152, CAMBRIDGE, IA 50046-0152
PO BOX 153, CAMBRIDGE, IA 50046-0153
PO BOX 154, CAMBRIDGE, IA 50046-0154
PO BOX 155, CAMBRIDGE, IA 50046-0155
PO BOX 156, CAMBRIDGE, IA 50046-0156
PO BOX 157, CAMBRIDGE, IA 50046-0157
PO BOX 158, CAMBRIDGE, IA 50046-0158
PO BOX 159, CAMBRIDGE, IA 50046-0159
PO BOX 160, CAMBRIDGE, IA 50046-0160
PO BOX 161, CAMBRIDGE, IA 50046-0161
PO BOX 162, CAMBRIDGE, IA 50046-0162
PO BOX 163, CAMBRIDGE, IA 50046-0163
PO BOX 164, CAMBRIDGE, IA 50046-0164
PO BOX 165, CAMBRIDGE, IA 50046-0165
PO BOX 166, CAMBRIDGE, IA 50046-0166
PO BOX 167, CAMBRIDGE, IA 50046-0167
PO BOX 168, CAMBRIDGE, IA 50046-0168
PO BOX 169, CAMBRIDGE, IA 50046-0169
PO BOX 170, CAMBRIDGE, IA 50046-0170
PO BOX 171, CAMBRIDGE, IA 50046-0171
PO BOX 172, CAMBRIDGE, IA 50046-0172
PO BOX 173, CAMBRIDGE, IA 50046-0173
PO BOX 174, CAMBRIDGE, IA 50046-0174
PO BOX 175, CAMBRIDGE, IA 50046-0175
PO BOX 176, CAMBRIDGE, IA 50046-0176
PO BOX 177, CAMBRIDGE, IA 50046-0177
PO BOX 178, CAMBRIDGE, IA 50046-0178
PO BOX 179, CAMBRIDGE, IA 50046-0179
PO BOX 180, CAMBRIDGE, IA 50046-0180
PO BOX 181, CAMBRIDGE, IA 50046-0181
PO BOX 182, CAMBRIDGE, IA 50046-0182
PO BOX 183, CAMBRIDGE, IA 50046-0183
PO BOX 184, CAMBRIDGE, IA 50046-0184
PO BOX 185, CAMBRIDGE, IA 50046-0185
PO BOX 186, CAMBRIDGE, IA 50046-0186
PO BOX 187, CAMBRIDGE, IA 50046-0187
PO BOX 188, CAMBRIDGE, IA 50046-0188
PO BOX 189, CAMBRIDGE, IA 50046-0189
PO BOX 190, CAMBRIDGE, IA 50046-0190
PO BOX 191, CAMBRIDGE, IA 50046-0191
PO BOX 192, CAMBRIDGE, IA 50046-0192
PO BOX 193, CAMBRIDGE, IA 50046-0193
PO BOX 194, CAMBRIDGE, IA 50046-0194
PO BOX 195, CAMBRIDGE, IA 50046-0195
PO BOX 196, CAMBRIDGE, IA 50046-0196
PO BOX 197, CAMBRIDGE, IA 50046-0197
PO BOX 198, CAMBRIDGE, IA 50046-0198
PO BOX 199, CAMBRIDGE, IA 50046-0199
PO BOX 200, CAMBRIDGE, IA 50046-0200
PO BOX 201, CAMBRIDGE, IA 50046-0201
PO BOX 202, CAMBRIDGE, IA 50046-0202
PO BOX 203, CAMBRIDGE, IA 50046-0203
PO BOX 204, CAMBRIDGE, IA 50046-0204
PO BOX 205, CAMBRIDGE, IA 50046-0205
PO BOX 206, CAMBRIDGE, IA 50046-0206
PO BOX 207, CAMBRIDGE, IA 50046-0207
PO BOX 208, CAMBRIDGE, IA 50046-0208
PO BOX 209, CAMBRIDGE, IA 50046-0209
PO BOX 210, CAMBRIDGE, IA 50046-0210
PO BOX 211, CAMBRIDGE, IA 50046-0211
PO BOX 212, CAMBRIDGE, IA 50046-0212
PO BOX 213, CAMBRIDGE, IA 50046-0213
PO BOX 214, CAMBRIDGE, IA 50046-0214
PO BOX 215, CAMBRIDGE, IA 50046-0215
PO BOX 216, CAMBRIDGE, IA 50046-0216
PO BOX 217, CAMBRIDGE, IA 50046-0217
PO BOX 218, CAMBRIDGE, IA 50046-0218
PO BOX 219, CAMBRIDGE, IA 50046-0219
PO BOX 220, CAMBRIDGE, IA 50046-0220
PO BOX 221, CAMBRIDGE, IA 50046-0221
PO BOX 222, CAMBRIDGE, IA 50046-0222
PO BOX 223, CAMBRIDGE, IA 50046-0223
PO BOX 224, CAMBRIDGE, IA 50046-0224
PO BOX 225, CAMBRIDGE, IA 50046-0225
PO BOX 226, CAMBRIDGE, IA 50046-0226
PO BOX 227, CAMBRIDGE, IA 50046-0227
PO BOX 228, CAMBRIDGE, IA 50046-0228
PO BOX 229, CAMBRIDGE, IA 50046-0229
PO BOX 230, CAMBRIDGE, IA 50046-0230
PO BOX 231, CAMBRIDGE, IA 50046-0231
PO BOX 232, CAMBRIDGE, IA 50046-0232
PO BOX 233, CAMBRIDGE, IA 50046-0233
PO BOX 234, CAMBRIDGE, IA 50046-0234
PO BOX 235, CAMBRIDGE, IA 50046-0235
PO BOX 236, CAMBRIDGE, IA 50046-0236
PO BOX 237, CAMBRIDGE, IA 50046-0237
PO BOX 238, CAMBRIDGE, IA 50046-0238
PO BOX 239, CAMBRIDGE, IA 50046-0239
PO BOX 240, CAMBRIDGE, IA 50046-0240
PO BOX 241, CAMBRIDGE, IA 50046-0241
PO BOX 242, CAMBRIDGE, IA 50046-0242
PO BOX 243, CAMBRIDGE, IA 50046-0243
PO BOX 244, CAMBRIDGE, IA 50046-0244
PO BOX 245, CAMBRIDGE, IA 50046-0245
PO BOX 246, CAMBRIDGE, IA 50046-0246
PO BOX 247, CAMBRIDGE, IA 50046-0247
PO BOX 248, CAMBRIDGE, IA 50046-0248
PO BOX 249, CAMBRIDGE, IA 50046-0249
PO BOX 250, CAMBRIDGE, IA 50046-0250
PO BOX 251, CAMBRIDGE, IA 50046-0251
PO BOX 252, CAMBRIDGE, IA 50046-0252
PO BOX 253, CAMBRIDGE, IA 50046-0253
PO BOX 254, CAMBRIDGE, IA 50046-0254
PO BOX 255, CAMBRIDGE, IA 50046-0255
PO BOX 256, CAMBRIDGE, IA 50046-0256
PO BOX 257, CAMBRIDGE, IA 50046-0257
PO BOX 258, CAMBRIDGE, IA 50046-0258
PO BOX 259, CAMBRIDGE, IA 50046-0259
PO BOX 260, CAMBRIDGE, IA 50046-0260
PO BOX 261, CAMBRIDGE, IA 50046-0261
PO BOX 262, CAMBRIDGE, IA 50046-0262
PO BOX 263, CAMBRIDGE, IA 50046-0263
PO BOX 264, CAMBRIDGE, IA 50046-0264
PO BOX 265, CAMBRIDGE, IA 50046-0265
PO BOX 266, CAMBRIDGE, IA 50046-0266
PO BOX 267, CAMBRIDGE, IA 50046-0267
PO BOX 268, CAMBRIDGE, IA 50046-0268
PO BOX 269, CAMBRIDGE, IA 50046-0269
PO BOX 270, CAMBRIDGE, IA 50046-0270
PO BOX 271, CAMBRIDGE, IA 50046-0271
PO BOX 272, CAMBRIDGE, IA 50046-0272
PO BOX 273, CAMBRIDGE, IA 50046-0273
PO BOX 274, CAMBRIDGE, IA 50046-0274
PO BOX 275, CAMBRIDGE, IA 50046-0275
PO BOX 276, CAMBRIDGE, IA 50046-0276
PO BOX 277, CAMBRIDGE, IA 50046-0277
PO BOX 278, CAMBRIDGE, IA 50046-0278
PO BOX 279, CAMBRIDGE, IA 50046-0279
PO BOX 280, CAMBRIDGE, IA 50046-0280
PO BOX 281, CAMBRIDGE, IA 50046-0281
PO BOX 282, CAMBRIDGE, IA 50046-0282
PO BOX 283, CAMBRIDGE, IA 50046-0283
PO BOX 284, CAMBRIDGE, IA 50046-0284
PO BOX 285, CAMBRIDGE, IA 50046-0285
PO BOX 286, CAMBRIDGE, IA 50046-0286
PO BOX 287, CAMBRIDGE, IA 50046-0287
PO BOX 288, CAMBRIDGE, IA 50046-0288
PO BOX 289, CAMBRIDGE, IA 50046-0289
PO BOX 290, CAMBRIDGE, IA 50046-0290
PO BOX 291, CAMBRIDGE, IA 50046-0291
PO BOX 292, CAMBRIDGE, IA 50046-0292
PO BOX 293, CAMBRIDGE, IA 50046-0293
PO BOX 294, CAMBRIDGE, IA 50046-0294
PO BOX 295, CAMBRIDGE, IA 50046-0295
PO BOX 296, CAMBRIDGE, IA 50046-0296
PO BOX 297, CAMBRIDGE, IA 50046-0297
PO BOX 298, CAMBRIDGE, IA 50046-0298
PO BOX 299, CAMBRIDGE, IA 50046-0299
PO BOX 300, CAMBRIDGE, IA 50046-0300
PO BOX 301, CAMBRIDGE, IA 50046-0301
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