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, DURANGO, CO 81302-0151
PO BOX 152, DURANGO, CO 81302-0152
PO BOX 153, DURANGO, CO 81302-0153
PO BOX 154, DURANGO, CO 81302-0154
PO BOX 155, DURANGO, CO 81302-0155
PO BOX 156, DURANGO, CO 81302-0156
PO BOX 157, DURANGO, CO 81302-0157
PO BOX 158, DURANGO, CO 81302-0158
PO BOX 159, DURANGO, CO 81302-0159
PO BOX 160, DURANGO, CO 81302-0160
PO BOX 161, DURANGO, CO 81302-0161
PO BOX 162, DURANGO, CO 81302-0162
PO BOX 163, DURANGO, CO 81302-0163
PO BOX 164, DURANGO, CO 81302-0164
PO BOX 165, DURANGO, CO 81302-0165
PO BOX 166, DURANGO, CO 81302-0166
PO BOX 167, DURANGO, CO 81302-0167
PO BOX 168, DURANGO, CO 81302-0168
PO BOX 169, DURANGO, CO 81302-0169
PO BOX 170, DURANGO, CO 81302-0170
PO BOX 171, DURANGO, CO 81302-0171
PO BOX 172, DURANGO, CO 81302-0172
PO BOX 173, DURANGO, CO 81302-0173
PO BOX 174, DURANGO, CO 81302-0174
PO BOX 175, DURANGO, CO 81302-0175
PO BOX 176, DURANGO, CO 81302-0176
PO BOX 177, DURANGO, CO 81302-0177
PO BOX 178, DURANGO, CO 81302-0178
PO BOX 179, DURANGO, CO 81302-0179
PO BOX 180, DURANGO, CO 81302-0180
PO BOX 181, DURANGO, CO 81302-0181
PO BOX 182, DURANGO, CO 81302-0182
PO BOX 183, DURANGO, CO 81302-0183
PO BOX 184, DURANGO, CO 81302-0184
PO BOX 185, DURANGO, CO 81302-0185
PO BOX 186, DURANGO, CO 81302-0186
PO BOX 187, DURANGO, CO 81302-0187
PO BOX 188, DURANGO, CO 81302-0188
PO BOX 189, DURANGO, CO 81302-0189
PO BOX 190, DURANGO, CO 81302-0190
PO BOX 191, DURANGO, CO 81302-0191
PO BOX 192, DURANGO, CO 81302-0192
PO BOX 193, DURANGO, CO 81302-0193
PO BOX 194, DURANGO, CO 81302-0194
PO BOX 195, DURANGO, CO 81302-0195
PO BOX 196, DURANGO, CO 81302-0196
PO BOX 197, DURANGO, CO 81302-0197
PO BOX 198, DURANGO, CO 81302-0198
PO BOX 199, DURANGO, CO 81302-0199
PO BOX 200, DURANGO, CO 81302-0200
PO BOX 201, DURANGO, CO 81302-0201
PO BOX 202, DURANGO, CO 81302-0202
PO BOX 203, DURANGO, CO 81302-0203
PO BOX 204, DURANGO, CO 81302-0204
PO BOX 205, DURANGO, CO 81302-0205
PO BOX 206, DURANGO, CO 81302-0206
PO BOX 207, DURANGO, CO 81302-0207
PO BOX 208, DURANGO, CO 81302-0208
PO BOX 209, DURANGO, CO 81302-0209
PO BOX 210, DURANGO, CO 81302-0210
PO BOX 211, DURANGO, CO 81302-0211
PO BOX 212, DURANGO, CO 81302-0212
PO BOX 213, DURANGO, CO 81302-0213
PO BOX 214, DURANGO, CO 81302-0214
PO BOX 215, DURANGO, CO 81302-0215
PO BOX 216, DURANGO, CO 81302-0216
PO BOX 217, DURANGO, CO 81302-0217
PO BOX 218, DURANGO, CO 81302-0218
PO BOX 219, DURANGO, CO 81302-0219
PO BOX 220, DURANGO, CO 81302-0220
PO BOX 221, DURANGO, CO 81302-0221
PO BOX 222, DURANGO, CO 81302-0222
PO BOX 223, DURANGO, CO 81302-0223
PO BOX 224, DURANGO, CO 81302-0224
PO BOX 225, DURANGO, CO 81302-0225
PO BOX 226, DURANGO, CO 81302-0226
PO BOX 227, DURANGO, CO 81302-0227
PO BOX 228, DURANGO, CO 81302-0228
PO BOX 229, DURANGO, CO 81302-0229
PO BOX 230, DURANGO, CO 81302-0230
PO BOX 231, DURANGO, CO 81302-0231
PO BOX 232, DURANGO, CO 81302-0232
PO BOX 233, DURANGO, CO 81302-0233
PO BOX 234, DURANGO, CO 81302-0234
PO BOX 235, DURANGO, CO 81302-0235
PO BOX 236, DURANGO, CO 81302-0236
PO BOX 237, DURANGO, CO 81302-0237
PO BOX 238, DURANGO, CO 81302-0238
PO BOX 239, DURANGO, CO 81302-0239
PO BOX 240, DURANGO, CO 81302-0240
PO BOX 241, DURANGO, CO 81302-0241
PO BOX 242, DURANGO, CO 81302-0242
PO BOX 243, DURANGO, CO 81302-0243
PO BOX 244, DURANGO, CO 81302-0244
PO BOX 245, DURANGO, CO 81302-0245
PO BOX 246, DURANGO, CO 81302-0246
PO BOX 247, DURANGO, CO 81302-0247
PO BOX 248, DURANGO, CO 81302-0248
PO BOX 249, DURANGO, CO 81302-0249
PO BOX 250, DURANGO, CO 81302-0250
PO BOX 251, DURANGO, CO 81302-0251
PO BOX 252, DURANGO, CO 81302-0252
PO BOX 253, DURANGO, CO 81302-0253
PO BOX 254, DURANGO, CO 81302-0254
PO BOX 255, DURANGO, CO 81302-0255
PO BOX 256, DURANGO, CO 81302-0256
PO BOX 257, DURANGO, CO 81302-0257
PO BOX 258, DURANGO, CO 81302-0258
PO BOX 259, DURANGO, CO 81302-0259
PO BOX 260, DURANGO, CO 81302-0260
PO BOX 261, DURANGO, CO 81302-0261
PO BOX 262, DURANGO, CO 81302-0262
PO BOX 263, DURANGO, CO 81302-0263
PO BOX 264, DURANGO, CO 81302-0264
PO BOX 265, DURANGO, CO 81302-0265
PO BOX 266, DURANGO, CO 81302-0266
PO BOX 267, DURANGO, CO 81302-0267
PO BOX 268, DURANGO, CO 81302-0268
PO BOX 269, DURANGO, CO 81302-0269
PO BOX 270, DURANGO, CO 81302-0270
PO BOX 271, DURANGO, CO 81302-0271
PO BOX 272, DURANGO, CO 81302-0272
PO BOX 273, DURANGO, CO 81302-0273
PO BOX 274, DURANGO, CO 81302-0274
PO BOX 275, DURANGO, CO 81302-0275
PO BOX 276, DURANGO, CO 81302-0276
PO BOX 277, DURANGO, CO 81302-0277
PO BOX 278, DURANGO, CO 81302-0278
PO BOX 279, DURANGO, CO 81302-0279
PO BOX 280, DURANGO, CO 81302-0280
PO BOX 281, DURANGO, CO 81302-0281
PO BOX 282, DURANGO, CO 81302-0282
PO BOX 283, DURANGO, CO 81302-0283
PO BOX 284, DURANGO, CO 81302-0284
PO BOX 285, DURANGO, CO 81302-0285
PO BOX 286, DURANGO, CO 81302-0286
PO BOX 287, DURANGO, CO 81302-0287
PO BOX 288, DURANGO, CO 81302-0288
PO BOX 289, DURANGO, CO 81302-0289
PO BOX 290, DURANGO, CO 81302-0290
PO BOX 291, DURANGO, CO 81302-0291
PO BOX 292, DURANGO, CO 81302-0292
PO BOX 293, DURANGO, CO 81302-0293
PO BOX 294, DURANGO, CO 81302-0294
PO BOX 295, DURANGO, CO 81302-0295
PO BOX 296, DURANGO, CO 81302-0296
PO BOX 297, DURANGO, CO 81302-0297
PO BOX 298, DURANGO, CO 81302-0298
PO BOX 299, DURANGO, CO 81302-0299
PO BOX 300, DURANGO, CO 81302-0300
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