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 6131, CAPITOL HEIGHTS, MD 20791-6131
PO BOX 6132, CAPITOL HEIGHTS, MD 20791-6132
PO BOX 6133, CAPITOL HEIGHTS, MD 20791-6133
PO BOX 6134, CAPITOL HEIGHTS, MD 20791-6134
PO BOX 6135, CAPITOL HEIGHTS, MD 20791-6135
PO BOX 6136, CAPITOL HEIGHTS, MD 20791-6136
PO BOX 6137, CAPITOL HEIGHTS, MD 20791-6137
PO BOX 6138, CAPITOL HEIGHTS, MD 20791-6138
PO BOX 6139, CAPITOL HEIGHTS, MD 20791-6139
PO BOX 6140, CAPITOL HEIGHTS, MD 20791-6140
PO BOX 6141, CAPITOL HEIGHTS, MD 20791-6141
PO BOX 6142, CAPITOL HEIGHTS, MD 20791-6142
PO BOX 6143, CAPITOL HEIGHTS, MD 20791-6143
PO BOX 6144, CAPITOL HEIGHTS, MD 20791-6144
PO BOX 6145, CAPITOL HEIGHTS, MD 20791-6145
PO BOX 6146, CAPITOL HEIGHTS, MD 20791-6146
PO BOX 6147, CAPITOL HEIGHTS, MD 20791-6147
PO BOX 6148, CAPITOL HEIGHTS, MD 20791-6148
PO BOX 6149, CAPITOL HEIGHTS, MD 20791-6149
PO BOX 6150, CAPITOL HEIGHTS, MD 20791-6150
PO BOX 6151, CAPITOL HEIGHTS, MD 20791-6151
PO BOX 6152, CAPITOL HEIGHTS, MD 20791-6152
PO BOX 6153, CAPITOL HEIGHTS, MD 20791-6153
PO BOX 6154, CAPITOL HEIGHTS, MD 20791-6154
PO BOX 6155, CAPITOL HEIGHTS, MD 20791-6155
PO BOX 6156, CAPITOL HEIGHTS, MD 20791-6156
PO BOX 6157, CAPITOL HEIGHTS, MD 20791-6157
PO BOX 6158, CAPITOL HEIGHTS, MD 20791-6158
PO BOX 6159, CAPITOL HEIGHTS, MD 20791-6159
PO BOX 6160, CAPITOL HEIGHTS, MD 20791-6160
PO BOX 6161, CAPITOL HEIGHTS, MD 20791-6161
PO BOX 6162, CAPITOL HEIGHTS, MD 20791-6162
PO BOX 6163, CAPITOL HEIGHTS, MD 20791-6163
PO BOX 6164, CAPITOL HEIGHTS, MD 20791-6164
PO BOX 6165, CAPITOL HEIGHTS, MD 20791-6165
PO BOX 6166, CAPITOL HEIGHTS, MD 20791-6166
PO BOX 6167, CAPITOL HEIGHTS, MD 20791-6167
PO BOX 6168, CAPITOL HEIGHTS, MD 20791-6168
PO BOX 6169, CAPITOL HEIGHTS, MD 20791-6169
PO BOX 6170, CAPITOL HEIGHTS, MD 20791-6170
PO BOX 6171, CAPITOL HEIGHTS, MD 20791-6171
PO BOX 6172, CAPITOL HEIGHTS, MD 20791-6172
PO BOX 6173, CAPITOL HEIGHTS, MD 20791-6173
PO BOX 6174, CAPITOL HEIGHTS, MD 20791-6174
PO BOX 6175, CAPITOL HEIGHTS, MD 20791-6175
PO BOX 6176, CAPITOL HEIGHTS, MD 20791-6176
PO BOX 6177, CAPITOL HEIGHTS, MD 20791-6177
PO BOX 6178, CAPITOL HEIGHTS, MD 20791-6178
PO BOX 6179, CAPITOL HEIGHTS, MD 20791-6179
PO BOX 6180, CAPITOL HEIGHTS, MD 20791-6180
PO BOX 6181, CAPITOL HEIGHTS, MD 20791-6181
PO BOX 6182, CAPITOL HEIGHTS, MD 20791-6182
PO BOX 6183, CAPITOL HEIGHTS, MD 20791-6183
PO BOX 6184, CAPITOL HEIGHTS, MD 20791-6184
PO BOX 6185, CAPITOL HEIGHTS, MD 20791-6185
PO BOX 6186, CAPITOL HEIGHTS, MD 20791-6186
PO BOX 6187, CAPITOL HEIGHTS, MD 20791-6187
PO BOX 6188, CAPITOL HEIGHTS, MD 20791-6188
PO BOX 6189, CAPITOL HEIGHTS, MD 20791-6189
PO BOX 6190, CAPITOL HEIGHTS, MD 20791-6190
PO BOX 6191, CAPITOL HEIGHTS, MD 20791-6191
PO BOX 6192, CAPITOL HEIGHTS, MD 20791-6192
PO BOX 6193, CAPITOL HEIGHTS, MD 20791-6193
PO BOX 6194, CAPITOL HEIGHTS, MD 20791-6194
PO BOX 6195, CAPITOL HEIGHTS, MD 20791-6195
PO BOX 6196, CAPITOL HEIGHTS, MD 20791-6196
PO BOX 6197, CAPITOL HEIGHTS, MD 20791-6197
PO BOX 6198, CAPITOL HEIGHTS, MD 20791-6198
PO BOX 6199, CAPITOL HEIGHTS, MD 20791-6199
PO BOX 6200, CAPITOL HEIGHTS, MD 20791-6200
PO BOX 6201, CAPITOL HEIGHTS, MD 20791-6201
PO BOX 6202, CAPITOL HEIGHTS, MD 20791-6202
PO BOX 6203, CAPITOL HEIGHTS, MD 20791-6203
PO BOX 6204, CAPITOL HEIGHTS, MD 20791-6204
PO BOX 6205, CAPITOL HEIGHTS, MD 20791-6205
PO BOX 6206, CAPITOL HEIGHTS, MD 20791-6206
PO BOX 6207, CAPITOL HEIGHTS, MD 20791-6207
PO BOX 6208, CAPITOL HEIGHTS, MD 20791-6208
PO BOX 6209, CAPITOL HEIGHTS, MD 20791-6209
PO BOX 6210, CAPITOL HEIGHTS, MD 20791-6210
PO BOX 6211, CAPITOL HEIGHTS, MD 20791-6211
PO BOX 6212, CAPITOL HEIGHTS, MD 20791-6212
PO BOX 6213, CAPITOL HEIGHTS, MD 20791-6213
PO BOX 6214, CAPITOL HEIGHTS, MD 20791-6214
PO BOX 6215, CAPITOL HEIGHTS, MD 20791-6215
PO BOX 6216, CAPITOL HEIGHTS, MD 20791-6216
PO BOX 6217, CAPITOL HEIGHTS, MD 20791-6217
PO BOX 6218, CAPITOL HEIGHTS, MD 20791-6218
PO BOX 6219, CAPITOL HEIGHTS, MD 20791-6219
PO BOX 6220, CAPITOL HEIGHTS, MD 20791-6220
PO BOX 6221, CAPITOL HEIGHTS, MD 20791-6221
PO BOX 6222, CAPITOL HEIGHTS, MD 20791-6222
PO BOX 6223, CAPITOL HEIGHTS, MD 20791-6223
PO BOX 6224, CAPITOL HEIGHTS, MD 20791-6224
PO BOX 6225, CAPITOL HEIGHTS, MD 20791-6225
PO BOX 6226, CAPITOL HEIGHTS, MD 20791-6226
PO BOX 6227, CAPITOL HEIGHTS, MD 20791-6227
PO BOX 6228, CAPITOL HEIGHTS, MD 20791-6228
PO BOX 6229, CAPITOL HEIGHTS, MD 20791-6229
PO BOX 6230, CAPITOL HEIGHTS, MD 20791-6230
PO BOX 6231, CAPITOL HEIGHTS, MD 20791-6231
PO BOX 6232, CAPITOL HEIGHTS, MD 20791-6232
PO BOX 6233, CAPITOL HEIGHTS, MD 20791-6233
PO BOX 6234, CAPITOL HEIGHTS, MD 20791-6234
PO BOX 6235, CAPITOL HEIGHTS, MD 20791-6235
PO BOX 6236, CAPITOL HEIGHTS, MD 20791-6236
PO BOX 6237, CAPITOL HEIGHTS, MD 20791-6237
PO BOX 6238, CAPITOL HEIGHTS, MD 20791-6238
PO BOX 6239, CAPITOL HEIGHTS, MD 20791-6239
PO BOX 6240, CAPITOL HEIGHTS, MD 20791-6240
PO BOX 6241, CAPITOL HEIGHTS, MD 20791-6241
PO BOX 6242, CAPITOL HEIGHTS, MD 20791-6242
PO BOX 6243, CAPITOL HEIGHTS, MD 20791-6243
PO BOX 6244, CAPITOL HEIGHTS, MD 20791-6244
PO BOX 6245, CAPITOL HEIGHTS, MD 20791-6245
PO BOX 6246, CAPITOL HEIGHTS, MD 20791-6246
PO BOX 6247, CAPITOL HEIGHTS, MD 20791-6247
PO BOX 6248, CAPITOL HEIGHTS, MD 20791-6248
PO BOX 6249, CAPITOL HEIGHTS, MD 20791-6249
PO BOX 6250, CAPITOL HEIGHTS, MD 20791-6250
PO BOX 6251, CAPITOL HEIGHTS, MD 20791-6251
PO BOX 6252, CAPITOL HEIGHTS, MD 20791-6252
PO BOX 6253, CAPITOL HEIGHTS, MD 20791-6253
PO BOX 6254, CAPITOL HEIGHTS, MD 20791-6254
PO BOX 6255, CAPITOL HEIGHTS, MD 20791-6255
PO BOX 6256, CAPITOL HEIGHTS, MD 20791-6256
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