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 5131, CAPITOL HEIGHTS, MD 20791-5131
PO BOX 5132, CAPITOL HEIGHTS, MD 20791-5132
PO BOX 5133, CAPITOL HEIGHTS, MD 20791-5133
PO BOX 5134, CAPITOL HEIGHTS, MD 20791-5134
PO BOX 5135, CAPITOL HEIGHTS, MD 20791-5135
PO BOX 5136, CAPITOL HEIGHTS, MD 20791-5136
PO BOX 5137, CAPITOL HEIGHTS, MD 20791-5137
PO BOX 5138, CAPITOL HEIGHTS, MD 20791-5138
PO BOX 5139, CAPITOL HEIGHTS, MD 20791-5139
PO BOX 5140, CAPITOL HEIGHTS, MD 20791-5140
PO BOX 5141, CAPITOL HEIGHTS, MD 20791-5141
PO BOX 5142, CAPITOL HEIGHTS, MD 20791-5142
PO BOX 5143, CAPITOL HEIGHTS, MD 20791-5143
PO BOX 5144, CAPITOL HEIGHTS, MD 20791-5144
PO BOX 5145, CAPITOL HEIGHTS, MD 20791-5145
PO BOX 5146, CAPITOL HEIGHTS, MD 20791-5146
PO BOX 5147, CAPITOL HEIGHTS, MD 20791-5147
PO BOX 5148, CAPITOL HEIGHTS, MD 20791-5148
PO BOX 5149, CAPITOL HEIGHTS, MD 20791-5149
PO BOX 5150, CAPITOL HEIGHTS, MD 20791-5150
PO BOX 5151, CAPITOL HEIGHTS, MD 20791-5151
PO BOX 5152, CAPITOL HEIGHTS, MD 20791-5152
PO BOX 5153, CAPITOL HEIGHTS, MD 20791-5153
PO BOX 5154, CAPITOL HEIGHTS, MD 20791-5154
PO BOX 5155, CAPITOL HEIGHTS, MD 20791-5155
PO BOX 5156, CAPITOL HEIGHTS, MD 20791-5156
PO BOX 5157, CAPITOL HEIGHTS, MD 20791-5157
PO BOX 5158, CAPITOL HEIGHTS, MD 20791-5158
PO BOX 5159, CAPITOL HEIGHTS, MD 20791-5159
PO BOX 5160, CAPITOL HEIGHTS, MD 20791-5160
PO BOX 5161, CAPITOL HEIGHTS, MD 20791-5161
PO BOX 5162, CAPITOL HEIGHTS, MD 20791-5162
PO BOX 5163, CAPITOL HEIGHTS, MD 20791-5163
PO BOX 5164, CAPITOL HEIGHTS, MD 20791-5164
PO BOX 5165, CAPITOL HEIGHTS, MD 20791-5165
PO BOX 5166, CAPITOL HEIGHTS, MD 20791-5166
PO BOX 5167, CAPITOL HEIGHTS, MD 20791-5167
PO BOX 5168, CAPITOL HEIGHTS, MD 20791-5168
PO BOX 5169, CAPITOL HEIGHTS, MD 20791-5169
PO BOX 5170, CAPITOL HEIGHTS, MD 20791-5170
PO BOX 5171, CAPITOL HEIGHTS, MD 20791-5171
PO BOX 5172, CAPITOL HEIGHTS, MD 20791-5172
PO BOX 5173, CAPITOL HEIGHTS, MD 20791-5173
PO BOX 5174, CAPITOL HEIGHTS, MD 20791-5174
PO BOX 5175, CAPITOL HEIGHTS, MD 20791-5175
PO BOX 5176, CAPITOL HEIGHTS, MD 20791-5176
PO BOX 5177, CAPITOL HEIGHTS, MD 20791-5177
PO BOX 5178, CAPITOL HEIGHTS, MD 20791-5178
PO BOX 5179, CAPITOL HEIGHTS, MD 20791-5179
PO BOX 5180, CAPITOL HEIGHTS, MD 20791-5180
PO BOX 5181, CAPITOL HEIGHTS, MD 20791-5181
PO BOX 5182, CAPITOL HEIGHTS, MD 20791-5182
PO BOX 5183, CAPITOL HEIGHTS, MD 20791-5183
PO BOX 5184, CAPITOL HEIGHTS, MD 20791-5184
PO BOX 5185, CAPITOL HEIGHTS, MD 20791-5185
PO BOX 5186, CAPITOL HEIGHTS, MD 20791-5186
PO BOX 5187, CAPITOL HEIGHTS, MD 20791-5187
PO BOX 5188, CAPITOL HEIGHTS, MD 20791-5188
PO BOX 5189, CAPITOL HEIGHTS, MD 20791-5189
PO BOX 5190, CAPITOL HEIGHTS, MD 20791-5190
PO BOX 5191, CAPITOL HEIGHTS, MD 20791-5191
PO BOX 5192, CAPITOL HEIGHTS, MD 20791-5192
PO BOX 5193, CAPITOL HEIGHTS, MD 20791-5193
PO BOX 5194, CAPITOL HEIGHTS, MD 20791-5194
PO BOX 5195, CAPITOL HEIGHTS, MD 20791-5195
PO BOX 5196, CAPITOL HEIGHTS, MD 20791-5196
PO BOX 5197, CAPITOL HEIGHTS, MD 20791-5197
PO BOX 5198, CAPITOL HEIGHTS, MD 20791-5198
PO BOX 5199, CAPITOL HEIGHTS, MD 20791-5199
PO BOX 5200, CAPITOL HEIGHTS, MD 20791-5200
PO BOX 5201, CAPITOL HEIGHTS, MD 20791-5201
PO BOX 5202, CAPITOL HEIGHTS, MD 20791-5202
PO BOX 5203, CAPITOL HEIGHTS, MD 20791-5203
PO BOX 5204, CAPITOL HEIGHTS, MD 20791-5204
PO BOX 5205, CAPITOL HEIGHTS, MD 20791-5205
PO BOX 5206, CAPITOL HEIGHTS, MD 20791-5206
PO BOX 5207, CAPITOL HEIGHTS, MD 20791-5207
PO BOX 5208, CAPITOL HEIGHTS, MD 20791-5208
PO BOX 5209, CAPITOL HEIGHTS, MD 20791-5209
PO BOX 5210, CAPITOL HEIGHTS, MD 20791-5210
PO BOX 5211, CAPITOL HEIGHTS, MD 20791-5211
PO BOX 5212, CAPITOL HEIGHTS, MD 20791-5212
PO BOX 5213, CAPITOL HEIGHTS, MD 20791-5213
PO BOX 5214, CAPITOL HEIGHTS, MD 20791-5214
PO BOX 5215, CAPITOL HEIGHTS, MD 20791-5215
PO BOX 5216, CAPITOL HEIGHTS, MD 20791-5216
PO BOX 5217, CAPITOL HEIGHTS, MD 20791-5217
PO BOX 5218, CAPITOL HEIGHTS, MD 20791-5218
PO BOX 5219, CAPITOL HEIGHTS, MD 20791-5219
PO BOX 5220, CAPITOL HEIGHTS, MD 20791-5220
PO BOX 5221, CAPITOL HEIGHTS, MD 20791-5221
PO BOX 5222, CAPITOL HEIGHTS, MD 20791-5222
PO BOX 5223, CAPITOL HEIGHTS, MD 20791-5223
PO BOX 5224, CAPITOL HEIGHTS, MD 20791-5224
PO BOX 5225, CAPITOL HEIGHTS, MD 20791-5225
PO BOX 5226, CAPITOL HEIGHTS, MD 20791-5226
PO BOX 5227, CAPITOL HEIGHTS, MD 20791-5227
PO BOX 5228, CAPITOL HEIGHTS, MD 20791-5228
PO BOX 5229, CAPITOL HEIGHTS, MD 20791-5229
PO BOX 5230, CAPITOL HEIGHTS, MD 20791-5230
PO BOX 5231, CAPITOL HEIGHTS, MD 20791-5231
PO BOX 5232, CAPITOL HEIGHTS, MD 20791-5232
PO BOX 5233, CAPITOL HEIGHTS, MD 20791-5233
PO BOX 5234, CAPITOL HEIGHTS, MD 20791-5234
PO BOX 5235, CAPITOL HEIGHTS, MD 20791-5235
PO BOX 5236, CAPITOL HEIGHTS, MD 20791-5236
PO BOX 5237, CAPITOL HEIGHTS, MD 20791-5237
PO BOX 5238, CAPITOL HEIGHTS, MD 20791-5238
PO BOX 5239, CAPITOL HEIGHTS, MD 20791-5239
PO BOX 5240, CAPITOL HEIGHTS, MD 20791-5240
PO BOX 5241, CAPITOL HEIGHTS, MD 20791-5241
PO BOX 5242, CAPITOL HEIGHTS, MD 20791-5242
PO BOX 5243, CAPITOL HEIGHTS, MD 20791-5243
PO BOX 5244, CAPITOL HEIGHTS, MD 20791-5244
PO BOX 5245, CAPITOL HEIGHTS, MD 20791-5245
PO BOX 5246, CAPITOL HEIGHTS, MD 20791-5246
PO BOX 5247, CAPITOL HEIGHTS, MD 20791-5247
PO BOX 5248, CAPITOL HEIGHTS, MD 20791-5248
PO BOX 5249, CAPITOL HEIGHTS, MD 20791-5249
PO BOX 5250, CAPITOL HEIGHTS, MD 20791-5250
PO BOX 5251, CAPITOL HEIGHTS, MD 20791-5251
PO BOX 5252, CAPITOL HEIGHTS, MD 20791-5252
PO BOX 5253, CAPITOL HEIGHTS, MD 20791-5253
PO BOX 5254, CAPITOL HEIGHTS, MD 20791-5254
PO BOX 5255, CAPITOL HEIGHTS, MD 20791-5255
PO BOX 5256, CAPITOL HEIGHTS, MD 20791-5256
PO BOX 5257, CAPITOL HEIGHTS, MD 20791-5257
PO BOX 5258, CAPITOL HEIGHTS, MD 20791-5258
PO BOX 5259, CAPITOL HEIGHTS, MD 20791-5259
PO BOX 5260, CAPITOL HEIGHTS, MD 20791-5260
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