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, LUTHERVILLE TIMONIUM, MD 21094-5131
PO BOX 5132, LUTHERVILLE TIMONIUM, MD 21094-5132
PO BOX 5133, LUTHERVILLE TIMONIUM, MD 21094-5133
PO BOX 5134, LUTHERVILLE TIMONIUM, MD 21094-5134
PO BOX 5135, LUTHERVILLE TIMONIUM, MD 21094-5135
PO BOX 5136, LUTHERVILLE TIMONIUM, MD 21094-5136
PO BOX 5137, LUTHERVILLE TIMONIUM, MD 21094-5137
PO BOX 5138, LUTHERVILLE TIMONIUM, MD 21094-5138
PO BOX 5139, LUTHERVILLE TIMONIUM, MD 21094-5139
PO BOX 5140, LUTHERVILLE TIMONIUM, MD 21094-5140
PO BOX 5141, LUTHERVILLE TIMONIUM, MD 21094-5141
PO BOX 5142, LUTHERVILLE TIMONIUM, MD 21094-5142
PO BOX 5143, LUTHERVILLE TIMONIUM, MD 21094-5143
PO BOX 5144, LUTHERVILLE TIMONIUM, MD 21094-5144
PO BOX 5145, LUTHERVILLE TIMONIUM, MD 21094-5145
PO BOX 5146, LUTHERVILLE TIMONIUM, MD 21094-5146
PO BOX 5147, LUTHERVILLE TIMONIUM, MD 21094-5147
PO BOX 5148, LUTHERVILLE TIMONIUM, MD 21094-5148
PO BOX 5149, LUTHERVILLE TIMONIUM, MD 21094-5149
PO BOX 5150, LUTHERVILLE TIMONIUM, MD 21094-5150
PO BOX 5151, LUTHERVILLE TIMONIUM, MD 21094-5151
PO BOX 5152, LUTHERVILLE TIMONIUM, MD 21094-5152
PO BOX 5153, LUTHERVILLE TIMONIUM, MD 21094-5153
PO BOX 5154, LUTHERVILLE TIMONIUM, MD 21094-5154
PO BOX 5155, LUTHERVILLE TIMONIUM, MD 21094-5155
PO BOX 5156, LUTHERVILLE TIMONIUM, MD 21094-5156
PO BOX 5157, LUTHERVILLE TIMONIUM, MD 21094-5157
PO BOX 5158, LUTHERVILLE TIMONIUM, MD 21094-5158
PO BOX 5159, LUTHERVILLE TIMONIUM, MD 21094-5159
PO BOX 5160, LUTHERVILLE TIMONIUM, MD 21094-5160
PO BOX 5161, LUTHERVILLE TIMONIUM, MD 21094-5161
PO BOX 5162, LUTHERVILLE TIMONIUM, MD 21094-5162
PO BOX 5163, LUTHERVILLE TIMONIUM, MD 21094-5163
PO BOX 5164, LUTHERVILLE TIMONIUM, MD 21094-5164
PO BOX 5165, LUTHERVILLE TIMONIUM, MD 21094-5165
PO BOX 5166, LUTHERVILLE TIMONIUM, MD 21094-5166
PO BOX 5167, LUTHERVILLE TIMONIUM, MD 21094-5167
PO BOX 5168, LUTHERVILLE TIMONIUM, MD 21094-5168
PO BOX 5169, LUTHERVILLE TIMONIUM, MD 21094-5169
PO BOX 5170, LUTHERVILLE TIMONIUM, MD 21094-5170
PO BOX 5171, LUTHERVILLE TIMONIUM, MD 21094-5171
PO BOX 5172, LUTHERVILLE TIMONIUM, MD 21094-5172
PO BOX 5173, LUTHERVILLE TIMONIUM, MD 21094-5173
PO BOX 5174, LUTHERVILLE TIMONIUM, MD 21094-5174
PO BOX 5175, LUTHERVILLE TIMONIUM, MD 21094-5175
PO BOX 5176, LUTHERVILLE TIMONIUM, MD 21094-5176
PO BOX 5177, LUTHERVILLE TIMONIUM, MD 21094-5177
PO BOX 5178, LUTHERVILLE TIMONIUM, MD 21094-5178
PO BOX 5179, LUTHERVILLE TIMONIUM, MD 21094-5179
PO BOX 5180, LUTHERVILLE TIMONIUM, MD 21094-5180
PO BOX 5181, LUTHERVILLE TIMONIUM, MD 21094-5181
PO BOX 5182, LUTHERVILLE TIMONIUM, MD 21094-5182
PO BOX 5183, LUTHERVILLE TIMONIUM, MD 21094-5183
PO BOX 5184, LUTHERVILLE TIMONIUM, MD 21094-5184
PO BOX 5185, LUTHERVILLE TIMONIUM, MD 21094-5185
PO BOX 5186, LUTHERVILLE TIMONIUM, MD 21094-5186
PO BOX 5187, LUTHERVILLE TIMONIUM, MD 21094-5187
PO BOX 5188, LUTHERVILLE TIMONIUM, MD 21094-5188
PO BOX 5189, LUTHERVILLE TIMONIUM, MD 21094-5189
PO BOX 5190, LUTHERVILLE TIMONIUM, MD 21094-5190
PO BOX 5191, LUTHERVILLE TIMONIUM, MD 21094-5191
PO BOX 5192, LUTHERVILLE TIMONIUM, MD 21094-5192
PO BOX 5193, LUTHERVILLE TIMONIUM, MD 21094-5193
PO BOX 5194, LUTHERVILLE TIMONIUM, MD 21094-5194
PO BOX 5195, LUTHERVILLE TIMONIUM, MD 21094-5195
PO BOX 5196, LUTHERVILLE TIMONIUM, MD 21094-5196
PO BOX 5197, LUTHERVILLE TIMONIUM, MD 21094-5197
PO BOX 5198, LUTHERVILLE TIMONIUM, MD 21094-5198
PO BOX 5199, LUTHERVILLE TIMONIUM, MD 21094-5199
PO BOX 5200, LUTHERVILLE TIMONIUM, MD 21094-5200
PO BOX 5201, LUTHERVILLE TIMONIUM, MD 21094-5201
PO BOX 5202, LUTHERVILLE TIMONIUM, MD 21094-5202
PO BOX 5203, LUTHERVILLE TIMONIUM, MD 21094-5203
PO BOX 5204, LUTHERVILLE TIMONIUM, MD 21094-5204
PO BOX 5205, LUTHERVILLE TIMONIUM, MD 21094-5205
PO BOX 5206, LUTHERVILLE TIMONIUM, MD 21094-5206
PO BOX 5207, LUTHERVILLE TIMONIUM, MD 21094-5207
PO BOX 5208, LUTHERVILLE TIMONIUM, MD 21094-5208
PO BOX 5209, LUTHERVILLE TIMONIUM, MD 21094-5209
PO BOX 5210, LUTHERVILLE TIMONIUM, MD 21094-5210
PO BOX 5211, LUTHERVILLE TIMONIUM, MD 21094-5211
PO BOX 5212, LUTHERVILLE TIMONIUM, MD 21094-5212
PO BOX 5213, LUTHERVILLE TIMONIUM, MD 21094-5213
PO BOX 5214, LUTHERVILLE TIMONIUM, MD 21094-5214
PO BOX 5215, LUTHERVILLE TIMONIUM, MD 21094-5215
PO BOX 5216, LUTHERVILLE TIMONIUM, MD 21094-5216
PO BOX 5217, LUTHERVILLE TIMONIUM, MD 21094-5217
PO BOX 5218, LUTHERVILLE TIMONIUM, MD 21094-5218
PO BOX 5219, LUTHERVILLE TIMONIUM, MD 21094-5219
PO BOX 5220, LUTHERVILLE TIMONIUM, MD 21094-5220
PO BOX 5221, LUTHERVILLE TIMONIUM, MD 21094-5221
PO BOX 5222, LUTHERVILLE TIMONIUM, MD 21094-5222
PO BOX 5223, LUTHERVILLE TIMONIUM, MD 21094-5223
PO BOX 5224, LUTHERVILLE TIMONIUM, MD 21094-5224
PO BOX 5225, LUTHERVILLE TIMONIUM, MD 21094-5225
PO BOX 5226, LUTHERVILLE TIMONIUM, MD 21094-5226
PO BOX 5227, LUTHERVILLE TIMONIUM, MD 21094-5227
PO BOX 5228, LUTHERVILLE TIMONIUM, MD 21094-5228
PO BOX 5229, LUTHERVILLE TIMONIUM, MD 21094-5229
PO BOX 5230, LUTHERVILLE TIMONIUM, MD 21094-5230
PO BOX 5231, LUTHERVILLE TIMONIUM, MD 21094-5231
PO BOX 5232, LUTHERVILLE TIMONIUM, MD 21094-5232
PO BOX 5233, LUTHERVILLE TIMONIUM, MD 21094-5233
PO BOX 5234, LUTHERVILLE TIMONIUM, MD 21094-5234
PO BOX 5235, LUTHERVILLE TIMONIUM, MD 21094-5235
PO BOX 5236, LUTHERVILLE TIMONIUM, MD 21094-5236
PO BOX 5237, LUTHERVILLE TIMONIUM, MD 21094-5237
PO BOX 5238, LUTHERVILLE TIMONIUM, MD 21094-5238
PO BOX 5239, LUTHERVILLE TIMONIUM, MD 21094-5239
PO BOX 5240, LUTHERVILLE TIMONIUM, MD 21094-5240
PO BOX 5241, LUTHERVILLE TIMONIUM, MD 21094-5241
PO BOX 5242, LUTHERVILLE TIMONIUM, MD 21094-5242
PO BOX 5243, LUTHERVILLE TIMONIUM, MD 21094-5243
PO BOX 5244, LUTHERVILLE TIMONIUM, MD 21094-5244
PO BOX 5245, LUTHERVILLE TIMONIUM, MD 21094-5245
PO BOX 5246, LUTHERVILLE TIMONIUM, MD 21094-5246
PO BOX 5247, LUTHERVILLE TIMONIUM, MD 21094-5247
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