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 4101, CAPITOL HEIGHTS, MD 20791-4101
PO BOX 4102, CAPITOL HEIGHTS, MD 20791-4102
PO BOX 4103, CAPITOL HEIGHTS, MD 20791-4103
PO BOX 4104, CAPITOL HEIGHTS, MD 20791-4104
PO BOX 4105, CAPITOL HEIGHTS, MD 20791-4105
PO BOX 4106, CAPITOL HEIGHTS, MD 20791-4106
PO BOX 4107, CAPITOL HEIGHTS, MD 20791-4107
PO BOX 4108, CAPITOL HEIGHTS, MD 20791-4108
PO BOX 4109, CAPITOL HEIGHTS, MD 20791-4109
PO BOX 4110, CAPITOL HEIGHTS, MD 20791-4110
PO BOX 4111, CAPITOL HEIGHTS, MD 20791-4111
PO BOX 4112, CAPITOL HEIGHTS, MD 20791-4112
PO BOX 4113, CAPITOL HEIGHTS, MD 20791-4113
PO BOX 4114, CAPITOL HEIGHTS, MD 20791-4114
PO BOX 4115, CAPITOL HEIGHTS, MD 20791-4115
PO BOX 4116, CAPITOL HEIGHTS, MD 20791-4116
PO BOX 4117, CAPITOL HEIGHTS, MD 20791-4117
PO BOX 4118, CAPITOL HEIGHTS, MD 20791-4118
PO BOX 4119, CAPITOL HEIGHTS, MD 20791-4119
PO BOX 4120, CAPITOL HEIGHTS, MD 20791-4120
PO BOX 4121, CAPITOL HEIGHTS, MD 20791-4121
PO BOX 4122, CAPITOL HEIGHTS, MD 20791-4122
PO BOX 4123, CAPITOL HEIGHTS, MD 20791-4123
PO BOX 4124, CAPITOL HEIGHTS, MD 20791-4124
PO BOX 4125, CAPITOL HEIGHTS, MD 20791-4125
PO BOX 4126, CAPITOL HEIGHTS, MD 20791-4126
PO BOX 4127, CAPITOL HEIGHTS, MD 20791-4127
PO BOX 4128, CAPITOL HEIGHTS, MD 20791-4128
PO BOX 4129, CAPITOL HEIGHTS, MD 20791-4129
PO BOX 4130, CAPITOL HEIGHTS, MD 20791-4130
PO BOX 4131, CAPITOL HEIGHTS, MD 20791-4131
PO BOX 4132, CAPITOL HEIGHTS, MD 20791-4132
PO BOX 4133, CAPITOL HEIGHTS, MD 20791-4133
PO BOX 4134, CAPITOL HEIGHTS, MD 20791-4134
PO BOX 4135, CAPITOL HEIGHTS, MD 20791-4135
PO BOX 4136, CAPITOL HEIGHTS, MD 20791-4136
PO BOX 4137, CAPITOL HEIGHTS, MD 20791-4137
PO BOX 4138, CAPITOL HEIGHTS, MD 20791-4138
PO BOX 4139, CAPITOL HEIGHTS, MD 20791-4139
PO BOX 4140, CAPITOL HEIGHTS, MD 20791-4140
PO BOX 4141, CAPITOL HEIGHTS, MD 20791-4141
PO BOX 4142, CAPITOL HEIGHTS, MD 20791-4142
PO BOX 4143, CAPITOL HEIGHTS, MD 20791-4143
PO BOX 4144, CAPITOL HEIGHTS, MD 20791-4144
PO BOX 4145, CAPITOL HEIGHTS, MD 20791-4145
PO BOX 4146, CAPITOL HEIGHTS, MD 20791-4146
PO BOX 4147, CAPITOL HEIGHTS, MD 20791-4147
PO BOX 4148, CAPITOL HEIGHTS, MD 20791-4148
PO BOX 4149, CAPITOL HEIGHTS, MD 20791-4149
PO BOX 4150, CAPITOL HEIGHTS, MD 20791-4150
PO BOX 4151, CAPITOL HEIGHTS, MD 20791-4151
PO BOX 4152, CAPITOL HEIGHTS, MD 20791-4152
PO BOX 4153, CAPITOL HEIGHTS, MD 20791-4153
PO BOX 4154, CAPITOL HEIGHTS, MD 20791-4154
PO BOX 4155, CAPITOL HEIGHTS, MD 20791-4155
PO BOX 4156, CAPITOL HEIGHTS, MD 20791-4156
PO BOX 4157, CAPITOL HEIGHTS, MD 20791-4157
PO BOX 4158, CAPITOL HEIGHTS, MD 20791-4158
PO BOX 4159, CAPITOL HEIGHTS, MD 20791-4159
PO BOX 4160, CAPITOL HEIGHTS, MD 20791-4160
PO BOX 4161, CAPITOL HEIGHTS, MD 20791-4161
PO BOX 4162, CAPITOL HEIGHTS, MD 20791-4162
PO BOX 4163, CAPITOL HEIGHTS, MD 20791-4163
PO BOX 4164, CAPITOL HEIGHTS, MD 20791-4164
PO BOX 4165, CAPITOL HEIGHTS, MD 20791-4165
PO BOX 4166, CAPITOL HEIGHTS, MD 20791-4166
PO BOX 4167, CAPITOL HEIGHTS, MD 20791-4167
PO BOX 4168, CAPITOL HEIGHTS, MD 20791-4168
PO BOX 4169, CAPITOL HEIGHTS, MD 20791-4169
PO BOX 4170, CAPITOL HEIGHTS, MD 20791-4170
PO BOX 4171, CAPITOL HEIGHTS, MD 20791-4171
PO BOX 4172, CAPITOL HEIGHTS, MD 20791-4172
PO BOX 4173, CAPITOL HEIGHTS, MD 20791-4173
PO BOX 4174, CAPITOL HEIGHTS, MD 20791-4174
PO BOX 4175, CAPITOL HEIGHTS, MD 20791-4175
PO BOX 4176, CAPITOL HEIGHTS, MD 20791-4176
PO BOX 4177, CAPITOL HEIGHTS, MD 20791-4177
PO BOX 4178, CAPITOL HEIGHTS, MD 20791-4178
PO BOX 4179, CAPITOL HEIGHTS, MD 20791-4179
PO BOX 4180, CAPITOL HEIGHTS, MD 20791-4180
PO BOX 4181, CAPITOL HEIGHTS, MD 20791-4181
PO BOX 4182, CAPITOL HEIGHTS, MD 20791-4182
PO BOX 4183, CAPITOL HEIGHTS, MD 20791-4183
PO BOX 4184, CAPITOL HEIGHTS, MD 20791-4184
PO BOX 4185, CAPITOL HEIGHTS, MD 20791-4185
PO BOX 4186, CAPITOL HEIGHTS, MD 20791-4186
PO BOX 4187, CAPITOL HEIGHTS, MD 20791-4187
PO BOX 4188, CAPITOL HEIGHTS, MD 20791-4188
PO BOX 4189, CAPITOL HEIGHTS, MD 20791-4189
PO BOX 4190, CAPITOL HEIGHTS, MD 20791-4190
PO BOX 4191, CAPITOL HEIGHTS, MD 20791-4191
PO BOX 4192, CAPITOL HEIGHTS, MD 20791-4192
PO BOX 4193, CAPITOL HEIGHTS, MD 20791-4193
PO BOX 4194, CAPITOL HEIGHTS, MD 20791-4194
PO BOX 4195, CAPITOL HEIGHTS, MD 20791-4195
PO BOX 4196, CAPITOL HEIGHTS, MD 20791-4196
PO BOX 4197, CAPITOL HEIGHTS, MD 20791-4197
PO BOX 4198, CAPITOL HEIGHTS, MD 20791-4198
PO BOX 4199, CAPITOL HEIGHTS, MD 20791-4199
PO BOX 4200, CAPITOL HEIGHTS, MD 20791-4200
PO BOX 4201, CAPITOL HEIGHTS, MD 20791-4201
PO BOX 4202, CAPITOL HEIGHTS, MD 20791-4202
PO BOX 4203, CAPITOL HEIGHTS, MD 20791-4203
PO BOX 4204, CAPITOL HEIGHTS, MD 20791-4204
PO BOX 4205, CAPITOL HEIGHTS, MD 20791-4205
PO BOX 4206, CAPITOL HEIGHTS, MD 20791-4206
PO BOX 4207, CAPITOL HEIGHTS, MD 20791-4207
PO BOX 4208, CAPITOL HEIGHTS, MD 20791-4208
PO BOX 4209, CAPITOL HEIGHTS, MD 20791-4209
PO BOX 4210, CAPITOL HEIGHTS, MD 20791-4210
PO BOX 4211, CAPITOL HEIGHTS, MD 20791-4211
PO BOX 4212, CAPITOL HEIGHTS, MD 20791-4212
PO BOX 4213, CAPITOL HEIGHTS, MD 20791-4213
PO BOX 4214, CAPITOL HEIGHTS, MD 20791-4214
PO BOX 4215, CAPITOL HEIGHTS, MD 20791-4215
PO BOX 4216, CAPITOL HEIGHTS, MD 20791-4216
PO BOX 4217, CAPITOL HEIGHTS, MD 20791-4217
PO BOX 4218, CAPITOL HEIGHTS, MD 20791-4218
PO BOX 4219, CAPITOL HEIGHTS, MD 20791-4219
PO BOX 4220, CAPITOL HEIGHTS, MD 20791-4220
PO BOX 4221, CAPITOL HEIGHTS, MD 20791-4221
PO BOX 4222, CAPITOL HEIGHTS, MD 20791-4222
PO BOX 4223, CAPITOL HEIGHTS, MD 20791-4223
PO BOX 4224, CAPITOL HEIGHTS, MD 20791-4224
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