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 10101, SPRINGFIELD, MO 65808-0101
PO BOX 10102, SPRINGFIELD, MO 65808-0102
PO BOX 10103, SPRINGFIELD, MO 65808-0103
PO BOX 10104, SPRINGFIELD, MO 65808-0104
PO BOX 10105, SPRINGFIELD, MO 65808-0105
PO BOX 10106, SPRINGFIELD, MO 65808-0106
PO BOX 10107, SPRINGFIELD, MO 65808-0107
PO BOX 10108, SPRINGFIELD, MO 65808-0108
PO BOX 10109, SPRINGFIELD, MO 65808-0109
PO BOX 10110, SPRINGFIELD, MO 65808-0110
PO BOX 10111, SPRINGFIELD, MO 65808-0111
PO BOX 10112, SPRINGFIELD, MO 65808-0112
PO BOX 10113, SPRINGFIELD, MO 65808-0113
PO BOX 10114, SPRINGFIELD, MO 65808-0114
PO BOX 10115, SPRINGFIELD, MO 65808-0115
PO BOX 10116, SPRINGFIELD, MO 65808-0116
PO BOX 10117, SPRINGFIELD, MO 65808-0117
PO BOX 10118, SPRINGFIELD, MO 65808-0118
PO BOX 10119, SPRINGFIELD, MO 65808-0119
PO BOX 10120, SPRINGFIELD, MO 65808-0120
PO BOX 10121, SPRINGFIELD, MO 65808-0121
PO BOX 10122, SPRINGFIELD, MO 65808-0122
PO BOX 10123, SPRINGFIELD, MO 65808-0123
PO BOX 10124, SPRINGFIELD, MO 65808-0124
PO BOX 10125, SPRINGFIELD, MO 65808-0125
PO BOX 10126, SPRINGFIELD, MO 65808-0126
PO BOX 10127, SPRINGFIELD, MO 65808-0127
PO BOX 10128, SPRINGFIELD, MO 65808-0128
PO BOX 10129, SPRINGFIELD, MO 65808-0129
PO BOX 10130, SPRINGFIELD, MO 65808-0130
PO BOX 10131, SPRINGFIELD, MO 65808-0131
PO BOX 10132, SPRINGFIELD, MO 65808-0132
PO BOX 10133, SPRINGFIELD, MO 65808-0133
PO BOX 10134, SPRINGFIELD, MO 65808-0134
PO BOX 10135, SPRINGFIELD, MO 65808-0135
PO BOX 10136, SPRINGFIELD, MO 65808-0136
PO BOX 10137, SPRINGFIELD, MO 65808-0137
PO BOX 10138, SPRINGFIELD, MO 65808-0138
PO BOX 10139, SPRINGFIELD, MO 65808-0139
PO BOX 10140, SPRINGFIELD, MO 65808-0140
PO BOX 10141, SPRINGFIELD, MO 65808-0141
PO BOX 10142, SPRINGFIELD, MO 65808-0142
PO BOX 10143, SPRINGFIELD, MO 65808-0143
PO BOX 10144, SPRINGFIELD, MO 65808-0144
PO BOX 10145, SPRINGFIELD, MO 65808-0145
PO BOX 10146, SPRINGFIELD, MO 65808-0146
PO BOX 10147, SPRINGFIELD, MO 65808-0147
PO BOX 10148, SPRINGFIELD, MO 65808-0148
PO BOX 10149, SPRINGFIELD, MO 65808-0149
PO BOX 10150, SPRINGFIELD, MO 65808-0150
PO BOX 10151, SPRINGFIELD, MO 65808-0151
PO BOX 10152, SPRINGFIELD, MO 65808-0152
PO BOX 10153, SPRINGFIELD, MO 65808-0153
PO BOX 10154, SPRINGFIELD, MO 65808-0154
PO BOX 10155, SPRINGFIELD, MO 65808-0155
PO BOX 10156, SPRINGFIELD, MO 65808-0156
PO BOX 10157, SPRINGFIELD, MO 65808-0157
PO BOX 10158, SPRINGFIELD, MO 65808-0158
PO BOX 10159, SPRINGFIELD, MO 65808-0159
PO BOX 10160, SPRINGFIELD, MO 65808-0160
PO BOX 10161, SPRINGFIELD, MO 65808-0161
PO BOX 10162, SPRINGFIELD, MO 65808-0162
PO BOX 10163, SPRINGFIELD, MO 65808-0163
PO BOX 10164, SPRINGFIELD, MO 65808-0164
PO BOX 10165, SPRINGFIELD, MO 65808-0165
PO BOX 10166, SPRINGFIELD, MO 65808-0166
PO BOX 10167, SPRINGFIELD, MO 65808-0167
PO BOX 10168, SPRINGFIELD, MO 65808-0168
PO BOX 10169, SPRINGFIELD, MO 65808-0169
PO BOX 10170, SPRINGFIELD, MO 65808-0170
PO BOX 10171, SPRINGFIELD, MO 65808-0171
PO BOX 10172, SPRINGFIELD, MO 65808-0172
PO BOX 10173, SPRINGFIELD, MO 65808-0173
PO BOX 10174, SPRINGFIELD, MO 65808-0174
PO BOX 10175, SPRINGFIELD, MO 65808-0175
PO BOX 10176, SPRINGFIELD, MO 65808-0176
PO BOX 10177, SPRINGFIELD, MO 65808-0177
PO BOX 10178, SPRINGFIELD, MO 65808-0178
PO BOX 10179, SPRINGFIELD, MO 65808-0179
PO BOX 10180, SPRINGFIELD, MO 65808-0180
PO BOX 10181, SPRINGFIELD, MO 65808-0181
PO BOX 10182, SPRINGFIELD, MO 65808-0182
PO BOX 10183, SPRINGFIELD, MO 65808-0183
PO BOX 10184, SPRINGFIELD, MO 65808-0184
PO BOX 10185, SPRINGFIELD, MO 65808-0185
PO BOX 10186, SPRINGFIELD, MO 65808-0186
PO BOX 10187, SPRINGFIELD, MO 65808-0187
PO BOX 10188, SPRINGFIELD, MO 65808-0188
PO BOX 10189, SPRINGFIELD, MO 65808-0189
PO BOX 10190, SPRINGFIELD, MO 65808-0190
PO BOX 10191, SPRINGFIELD, MO 65808-0191
PO BOX 10192, SPRINGFIELD, MO 65808-0192
PO BOX 10193, SPRINGFIELD, MO 65808-0193
PO BOX 10194, SPRINGFIELD, MO 65808-0194
PO BOX 10195, SPRINGFIELD, MO 65808-0195
PO BOX 10196, SPRINGFIELD, MO 65808-0196
PO BOX 10197, SPRINGFIELD, MO 65808-0197
PO BOX 10198, SPRINGFIELD, MO 65808-0198
PO BOX 10199, SPRINGFIELD, MO 65808-0199
PO BOX 10200, SPRINGFIELD, MO 65808-0200
PO BOX 10201, SPRINGFIELD, MO 65808-0201
PO BOX 10202, SPRINGFIELD, MO 65808-0202
PO BOX 10203, SPRINGFIELD, MO 65808-0203
PO BOX 10204, SPRINGFIELD, MO 65808-0204
PO BOX 10205, SPRINGFIELD, MO 65808-0205
PO BOX 10206, SPRINGFIELD, MO 65808-0206
PO BOX 10207, SPRINGFIELD, MO 65808-0207
PO BOX 10208, SPRINGFIELD, MO 65808-0208
PO BOX 10209, SPRINGFIELD, MO 65808-0209
PO BOX 10210, SPRINGFIELD, MO 65808-0210
PO BOX 10211, SPRINGFIELD, MO 65808-0211
PO BOX 10212, SPRINGFIELD, MO 65808-0212
PO BOX 10213, SPRINGFIELD, MO 65808-0213
PO BOX 10214, SPRINGFIELD, MO 65808-0214
PO BOX 10215, SPRINGFIELD, MO 65808-0215
PO BOX 10216, SPRINGFIELD, MO 65808-0216
PO BOX 10217, SPRINGFIELD, MO 65808-0217
PO BOX 10218, SPRINGFIELD, MO 65808-0218
PO BOX 10219, SPRINGFIELD, MO 65808-0219
PO BOX 10220, SPRINGFIELD, MO 65808-0220
PO BOX 10221, SPRINGFIELD, MO 65808-0221
PO BOX 10222, SPRINGFIELD, MO 65808-0222
PO BOX 10223, SPRINGFIELD, MO 65808-0223
PO BOX 10224, SPRINGFIELD, MO 65808-0224
PO BOX 10225, SPRINGFIELD, MO 65808-0225
PO BOX 10226, SPRINGFIELD, MO 65808-0226
PO BOX 10227, SPRINGFIELD, MO 65808-0227
PO BOX 10228, SPRINGFIELD, MO 65808-0228
PO BOX 10229, SPRINGFIELD, MO 65808-0229
PO BOX 10230, SPRINGFIELD, MO 65808-0230
PO BOX 10231, SPRINGFIELD, MO 65808-0231
PO BOX 10232, SPRINGFIELD, MO 65808-0232
PO BOX 10233, SPRINGFIELD, MO 65808-0233
PO BOX 10234, SPRINGFIELD, MO 65808-0234
PO BOX 10235, SPRINGFIELD, MO 65808-0235
PO BOX 10236, SPRINGFIELD, MO 65808-0236
PO BOX 10237, SPRINGFIELD, MO 65808-0237
PO BOX 10238, SPRINGFIELD, MO 65808-0238
PO BOX 10239, SPRINGFIELD, MO 65808-0239
PO BOX 10240, SPRINGFIELD, MO 65808-0240
PO BOX 10241, SPRINGFIELD, MO 65808-0241
PO BOX 10242, SPRINGFIELD, MO 65808-0242
PO BOX 10243, SPRINGFIELD, MO 65808-0243
PO BOX 10244, SPRINGFIELD, MO 65808-0244
PO BOX 10245, SPRINGFIELD, MO 65808-0245
PO BOX 10246, SPRINGFIELD, MO 65808-0246
PO BOX 10247, SPRINGFIELD, MO 65808-0247
PO BOX 10248, SPRINGFIELD, MO 65808-0248
PO BOX 10249, SPRINGFIELD, MO 65808-0249
PO BOX 10250, SPRINGFIELD, MO 65808-0250
PO BOX 10251, SPRINGFIELD, MO 65808-0251
PO BOX 10252, SPRINGFIELD, MO 65808-0252
PO BOX 10253, SPRINGFIELD, MO 65808-0253
PO BOX 10254, SPRINGFIELD, MO 65808-0254
PO BOX 10255, SPRINGFIELD, MO 65808-0255
PO BOX 10256, SPRINGFIELD, MO 65808-0256
PO BOX 10257, SPRINGFIELD, MO 65808-0257
PO BOX 10258, SPRINGFIELD, MO 65808-0258
PO BOX 10259, SPRINGFIELD, MO 65808-0259
PO BOX 10260, SPRINGFIELD, MO 65808-0260
PO BOX 10261, SPRINGFIELD, MO 65808-0261
PO BOX 10262, SPRINGFIELD, MO 65808-0262
PO BOX 10263, SPRINGFIELD, MO 65808-0263
PO BOX 10264, SPRINGFIELD, MO 65808-0264
PO BOX 10265, SPRINGFIELD, MO 65808-0265
PO BOX 10266, SPRINGFIELD, MO 65808-0266
PO BOX 10267, SPRINGFIELD, MO 65808-0267
PO BOX 10268, SPRINGFIELD, MO 65808-0268
PO BOX 10269, SPRINGFIELD, MO 65808-0269
PO BOX 10270, SPRINGFIELD, MO 65808-0270
PO BOX 10271, SPRINGFIELD, MO 65808-0271
PO BOX 10272, SPRINGFIELD, MO 65808-0272
PO BOX 10273, SPRINGFIELD, MO 65808-0273
PO BOX 10274, SPRINGFIELD, MO 65808-0274
PO BOX 10275, SPRINGFIELD, MO 65808-0275
PO BOX 10276, SPRINGFIELD, MO 65808-0276
PO BOX 10277, SPRINGFIELD, MO 65808-0277
PO BOX 10278, SPRINGFIELD, MO 65808-0278
PO BOX 10279, SPRINGFIELD, MO 65808-0279
PO BOX 10280, SPRINGFIELD, MO 65808-0280
PO BOX 10281, SPRINGFIELD, MO 65808-0281
PO BOX 10282, SPRINGFIELD, MO 65808-0282
PO BOX 10283, SPRINGFIELD, MO 65808-0283
PO BOX 10284, SPRINGFIELD, MO 65808-0284
PO BOX 10285, SPRINGFIELD, MO 65808-0285
PO BOX 10286, SPRINGFIELD, MO 65808-0286
PO BOX 10287, SPRINGFIELD, MO 65808-0287
PO BOX 10288, SPRINGFIELD, MO 65808-0288
PO BOX 10289, SPRINGFIELD, MO 65808-0289
PO BOX 10290, SPRINGFIELD, MO 65808-0290
PO BOX 10291, SPRINGFIELD, MO 65808-0291
PO BOX 10292, SPRINGFIELD, MO 65808-0292
PO BOX 10293, SPRINGFIELD, MO 65808-0293
PO BOX 10294, SPRINGFIELD, MO 65808-0294
PO BOX 10295, SPRINGFIELD, MO 65808-0295
PO BOX 10296, SPRINGFIELD, MO 65808-0296
PO BOX 10297, SPRINGFIELD, MO 65808-0297
PO BOX 10298, SPRINGFIELD, MO 65808-0298
PO BOX 10299, SPRINGFIELD, MO 65808-0299
PO BOX 10300, SPRINGFIELD, MO 65808-0300
PO BOX 10301, SPRINGFIELD, MO 65808-0301
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