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 820121, NORTH RICHLAND HILLS, TX 76182-0121
PO BOX 820122, NORTH RICHLAND HILLS, TX 76182-0122
PO BOX 820123, NORTH RICHLAND HILLS, TX 76182-0123
PO BOX 820124, NORTH RICHLAND HILLS, TX 76182-0124
PO BOX 820125, NORTH RICHLAND HILLS, TX 76182-0125
PO BOX 820126, NORTH RICHLAND HILLS, TX 76182-0126
PO BOX 820127, NORTH RICHLAND HILLS, TX 76182-0127
PO BOX 820128, NORTH RICHLAND HILLS, TX 76182-0128
PO BOX 820129, NORTH RICHLAND HILLS, TX 76182-0129
PO BOX 820130, NORTH RICHLAND HILLS, TX 76182-0130
PO BOX 820131, NORTH RICHLAND HILLS, TX 76182-0131
PO BOX 820132, NORTH RICHLAND HILLS, TX 76182-0132
PO BOX 820133, NORTH RICHLAND HILLS, TX 76182-0133
PO BOX 820134, NORTH RICHLAND HILLS, TX 76182-0134
PO BOX 820135, NORTH RICHLAND HILLS, TX 76182-0135
PO BOX 820136, NORTH RICHLAND HILLS, TX 76182-0136
PO BOX 820137, NORTH RICHLAND HILLS, TX 76182-0137
PO BOX 820138, NORTH RICHLAND HILLS, TX 76182-0138
PO BOX 820139, NORTH RICHLAND HILLS, TX 76182-0139
PO BOX 820140, NORTH RICHLAND HILLS, TX 76182-0140
PO BOX 820141, NORTH RICHLAND HILLS, TX 76182-0141
PO BOX 820142, NORTH RICHLAND HILLS, TX 76182-0142
PO BOX 820143, NORTH RICHLAND HILLS, TX 76182-0143
PO BOX 820144, NORTH RICHLAND HILLS, TX 76182-0144
PO BOX 820145, NORTH RICHLAND HILLS, TX 76182-0145
PO BOX 820146, NORTH RICHLAND HILLS, TX 76182-0146
PO BOX 820147, NORTH RICHLAND HILLS, TX 76182-0147
PO BOX 820148, NORTH RICHLAND HILLS, TX 76182-0148
PO BOX 820149, NORTH RICHLAND HILLS, TX 76182-0149
PO BOX 820150, NORTH RICHLAND HILLS, TX 76182-0150
PO BOX 820151, NORTH RICHLAND HILLS, TX 76182-0151
PO BOX 820152, NORTH RICHLAND HILLS, TX 76182-0152
PO BOX 820153, NORTH RICHLAND HILLS, TX 76182-0153
PO BOX 820154, NORTH RICHLAND HILLS, TX 76182-0154
PO BOX 820155, NORTH RICHLAND HILLS, TX 76182-0155
PO BOX 820156, NORTH RICHLAND HILLS, TX 76182-0156
PO BOX 820157, NORTH RICHLAND HILLS, TX 76182-0157
PO BOX 820158, NORTH RICHLAND HILLS, TX 76182-0158
PO BOX 820159, NORTH RICHLAND HILLS, TX 76182-0159
PO BOX 820160, NORTH RICHLAND HILLS, TX 76182-0160
PO BOX 820161, NORTH RICHLAND HILLS, TX 76182-0161
PO BOX 820162, NORTH RICHLAND HILLS, TX 76182-0162
PO BOX 820163, NORTH RICHLAND HILLS, TX 76182-0163
PO BOX 820164, NORTH RICHLAND HILLS, TX 76182-0164
PO BOX 820165, NORTH RICHLAND HILLS, TX 76182-0165
PO BOX 820166, NORTH RICHLAND HILLS, TX 76182-0166
PO BOX 820167, NORTH RICHLAND HILLS, TX 76182-0167
PO BOX 820168, NORTH RICHLAND HILLS, TX 76182-0168
PO BOX 820169, NORTH RICHLAND HILLS, TX 76182-0169
PO BOX 820170, NORTH RICHLAND HILLS, TX 76182-0170
PO BOX 820171, NORTH RICHLAND HILLS, TX 76182-0171
PO BOX 820172, NORTH RICHLAND HILLS, TX 76182-0172
PO BOX 820173, NORTH RICHLAND HILLS, TX 76182-0173
PO BOX 820174, NORTH RICHLAND HILLS, TX 76182-0174
PO BOX 820175, NORTH RICHLAND HILLS, TX 76182-0175
PO BOX 820176, NORTH RICHLAND HILLS, TX 76182-0176
PO BOX 820177, NORTH RICHLAND HILLS, TX 76182-0177
PO BOX 820178, NORTH RICHLAND HILLS, TX 76182-0178
PO BOX 820179, NORTH RICHLAND HILLS, TX 76182-0179
PO BOX 820180, NORTH RICHLAND HILLS, TX 76182-0180
PO BOX 820181, NORTH RICHLAND HILLS, TX 76182-0181
PO BOX 820182, NORTH RICHLAND HILLS, TX 76182-0182
PO BOX 820183, NORTH RICHLAND HILLS, TX 76182-0183
PO BOX 820184, NORTH RICHLAND HILLS, TX 76182-0184
PO BOX 820185, NORTH RICHLAND HILLS, TX 76182-0185
PO BOX 820186, NORTH RICHLAND HILLS, TX 76182-0186
PO BOX 820187, NORTH RICHLAND HILLS, TX 76182-0187
PO BOX 820188, NORTH RICHLAND HILLS, TX 76182-0188
PO BOX 820189, NORTH RICHLAND HILLS, TX 76182-0189
PO BOX 820190, NORTH RICHLAND HILLS, TX 76182-0190
PO BOX 820191, NORTH RICHLAND HILLS, TX 76182-0191
PO BOX 820192, NORTH RICHLAND HILLS, TX 76182-0192
PO BOX 820193, NORTH RICHLAND HILLS, TX 76182-0193
PO BOX 820194, NORTH RICHLAND HILLS, TX 76182-0194
PO BOX 820195, NORTH RICHLAND HILLS, TX 76182-0195
PO BOX 820196, NORTH RICHLAND HILLS, TX 76182-0196
PO BOX 820197, NORTH RICHLAND HILLS, TX 76182-0197
PO BOX 820198, NORTH RICHLAND HILLS, TX 76182-0198
PO BOX 820199, NORTH RICHLAND HILLS, TX 76182-0199
PO BOX 820200, NORTH RICHLAND HILLS, TX 76182-0200
PO BOX 820201, NORTH RICHLAND HILLS, TX 76182-0201
PO BOX 820202, NORTH RICHLAND HILLS, TX 76182-0202
PO BOX 820203, NORTH RICHLAND HILLS, TX 76182-0203
PO BOX 820204, NORTH RICHLAND HILLS, TX 76182-0204
PO BOX 820205, NORTH RICHLAND HILLS, TX 76182-0205
PO BOX 820206, NORTH RICHLAND HILLS, TX 76182-0206
PO BOX 820207, NORTH RICHLAND HILLS, TX 76182-0207
PO BOX 820208, NORTH RICHLAND HILLS, TX 76182-0208
PO BOX 820209, NORTH RICHLAND HILLS, TX 76182-0209
PO BOX 820210, NORTH RICHLAND HILLS, TX 76182-0210
PO BOX 820211, NORTH RICHLAND HILLS, TX 76182-0211
PO BOX 820212, NORTH RICHLAND HILLS, TX 76182-0212
PO BOX 820213, NORTH RICHLAND HILLS, TX 76182-0213
PO BOX 820214, NORTH RICHLAND HILLS, TX 76182-0214
PO BOX 820215, NORTH RICHLAND HILLS, TX 76182-0215
PO BOX 820216, NORTH RICHLAND HILLS, TX 76182-0216
PO BOX 820217, NORTH RICHLAND HILLS, TX 76182-0217
PO BOX 820218, NORTH RICHLAND HILLS, TX 76182-0218
PO BOX 820219, NORTH RICHLAND HILLS, TX 76182-0219
PO BOX 820220, NORTH RICHLAND HILLS, TX 76182-0220
PO BOX 820221, NORTH RICHLAND HILLS, TX 76182-0221
PO BOX 820222, NORTH RICHLAND HILLS, TX 76182-0222
PO BOX 820223, NORTH RICHLAND HILLS, TX 76182-0223
PO BOX 820224, NORTH RICHLAND HILLS, TX 76182-0224
PO BOX 820225, NORTH RICHLAND HILLS, TX 76182-0225
PO BOX 820226, NORTH RICHLAND HILLS, TX 76182-0226
PO BOX 820227, NORTH RICHLAND HILLS, TX 76182-0227
PO BOX 820228, NORTH RICHLAND HILLS, TX 76182-0228
PO BOX 820229, NORTH RICHLAND HILLS, TX 76182-0229
PO BOX 820230, NORTH RICHLAND HILLS, TX 76182-0230
PO BOX 820231, NORTH RICHLAND HILLS, TX 76182-0231
PO BOX 820232, NORTH RICHLAND HILLS, TX 76182-0232
PO BOX 820233, NORTH RICHLAND HILLS, TX 76182-0233
PO BOX 820234, NORTH RICHLAND HILLS, TX 76182-0234
PO BOX 820235, NORTH RICHLAND HILLS, TX 76182-0235
PO BOX 820236, NORTH RICHLAND HILLS, TX 76182-0236
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