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 121, CHRISTIANSBURG, VA 24068-0121
PO BOX 122, CHRISTIANSBURG, VA 24068-0122
PO BOX 123, CHRISTIANSBURG, VA 24068-0123
PO BOX 124, CHRISTIANSBURG, VA 24068-0124
PO BOX 125, CHRISTIANSBURG, VA 24068-0125
PO BOX 126, CHRISTIANSBURG, VA 24068-0126
PO BOX 127, CHRISTIANSBURG, VA 24068-0127
PO BOX 128, CHRISTIANSBURG, VA 24068-0128
PO BOX 129, CHRISTIANSBURG, VA 24068-0129
PO BOX 130, CHRISTIANSBURG, VA 24068-0130
PO BOX 131, CHRISTIANSBURG, VA 24068-0131
PO BOX 132, CHRISTIANSBURG, VA 24068-0132
PO BOX 133, CHRISTIANSBURG, VA 24068-0133
PO BOX 134, CHRISTIANSBURG, VA 24068-0134
PO BOX 135, CHRISTIANSBURG, VA 24068-0135
PO BOX 136, CHRISTIANSBURG, VA 24068-0136
PO BOX 137, CHRISTIANSBURG, VA 24068-0137
PO BOX 138, CHRISTIANSBURG, VA 24068-0138
PO BOX 139, CHRISTIANSBURG, VA 24068-0139
PO BOX 140, CHRISTIANSBURG, VA 24068-0140
PO BOX 141, CHRISTIANSBURG, VA 24068-0141
PO BOX 142, CHRISTIANSBURG, VA 24068-0142
PO BOX 143, CHRISTIANSBURG, VA 24068-0143
PO BOX 144, CHRISTIANSBURG, VA 24068-0144
PO BOX 145, CHRISTIANSBURG, VA 24068-0145
PO BOX 146, CHRISTIANSBURG, VA 24068-0146
PO BOX 147, CHRISTIANSBURG, VA 24068-0147
PO BOX 148, CHRISTIANSBURG, VA 24068-0148
PO BOX 149, CHRISTIANSBURG, VA 24068-0149
PO BOX 150, CHRISTIANSBURG, VA 24068-0150
PO BOX 151, CHRISTIANSBURG, VA 24068-0151
PO BOX 152, CHRISTIANSBURG, VA 24068-0152
PO BOX 153, CHRISTIANSBURG, VA 24068-0153
PO BOX 154, CHRISTIANSBURG, VA 24068-0154
PO BOX 155, CHRISTIANSBURG, VA 24068-0155
PO BOX 156, CHRISTIANSBURG, VA 24068-0156
PO BOX 157, CHRISTIANSBURG, VA 24068-0157
PO BOX 158, CHRISTIANSBURG, VA 24068-0158
PO BOX 159, CHRISTIANSBURG, VA 24068-0159
PO BOX 160, CHRISTIANSBURG, VA 24068-0160
PO BOX 161, CHRISTIANSBURG, VA 24068-0161
PO BOX 162, CHRISTIANSBURG, VA 24068-0162
PO BOX 163, CHRISTIANSBURG, VA 24068-0163
PO BOX 164, CHRISTIANSBURG, VA 24068-0164
PO BOX 165, CHRISTIANSBURG, VA 24068-0165
PO BOX 166, CHRISTIANSBURG, VA 24068-0166
PO BOX 167, CHRISTIANSBURG, VA 24068-0167
PO BOX 168, CHRISTIANSBURG, VA 24068-0168
PO BOX 169, CHRISTIANSBURG, VA 24068-0169
PO BOX 170, CHRISTIANSBURG, VA 24068-0170
PO BOX 171, CHRISTIANSBURG, VA 24068-0171
PO BOX 172, CHRISTIANSBURG, VA 24068-0172
PO BOX 173, CHRISTIANSBURG, VA 24068-0173
PO BOX 174, CHRISTIANSBURG, VA 24068-0174
PO BOX 175, CHRISTIANSBURG, VA 24068-0175
PO BOX 176, CHRISTIANSBURG, VA 24068-0176
PO BOX 177, CHRISTIANSBURG, VA 24068-0177
PO BOX 178, CHRISTIANSBURG, VA 24068-0178
PO BOX 179, CHRISTIANSBURG, VA 24068-0179
PO BOX 180, CHRISTIANSBURG, VA 24068-0180
PO BOX 181, CHRISTIANSBURG, VA 24068-0181
PO BOX 182, CHRISTIANSBURG, VA 24068-0182
PO BOX 183, CHRISTIANSBURG, VA 24068-0183
PO BOX 184, CHRISTIANSBURG, VA 24068-0184
PO BOX 185, CHRISTIANSBURG, VA 24068-0185
PO BOX 186, CHRISTIANSBURG, VA 24068-0186
PO BOX 187, CHRISTIANSBURG, VA 24068-0187
PO BOX 188, CHRISTIANSBURG, VA 24068-0188
PO BOX 189, CHRISTIANSBURG, VA 24068-0189
PO BOX 190, CHRISTIANSBURG, VA 24068-0190
PO BOX 191, CHRISTIANSBURG, VA 24068-0191
PO BOX 192, CHRISTIANSBURG, VA 24068-0192
PO BOX 193, CHRISTIANSBURG, VA 24068-0193
PO BOX 194, CHRISTIANSBURG, VA 24068-0194
PO BOX 195, CHRISTIANSBURG, VA 24068-0195
PO BOX 196, CHRISTIANSBURG, VA 24068-0196
PO BOX 197, CHRISTIANSBURG, VA 24068-0197
PO BOX 198, CHRISTIANSBURG, VA 24068-0198
PO BOX 199, CHRISTIANSBURG, VA 24068-0199
PO BOX 200, CHRISTIANSBURG, VA 24068-0200
PO BOX 201, CHRISTIANSBURG, VA 24068-0201
PO BOX 202, CHRISTIANSBURG, VA 24068-0202
PO BOX 203, CHRISTIANSBURG, VA 24068-0203
PO BOX 204, CHRISTIANSBURG, VA 24068-0204
PO BOX 205, CHRISTIANSBURG, VA 24068-0205
PO BOX 206, CHRISTIANSBURG, VA 24068-0206
PO BOX 207, CHRISTIANSBURG, VA 24068-0207
PO BOX 208, CHRISTIANSBURG, VA 24068-0208
PO BOX 209, CHRISTIANSBURG, VA 24068-0209
PO BOX 210, CHRISTIANSBURG, VA 24068-0210
PO BOX 211, CHRISTIANSBURG, VA 24068-0211
PO BOX 212, CHRISTIANSBURG, VA 24068-0212
PO BOX 213, CHRISTIANSBURG, VA 24068-0213
PO BOX 214, CHRISTIANSBURG, VA 24068-0214
PO BOX 215, CHRISTIANSBURG, VA 24068-0215
PO BOX 216, CHRISTIANSBURG, VA 24068-0216
PO BOX 217, CHRISTIANSBURG, VA 24068-0217
PO BOX 218, CHRISTIANSBURG, VA 24068-0218
PO BOX 219, CHRISTIANSBURG, VA 24068-0219
PO BOX 220, CHRISTIANSBURG, VA 24068-0220
PO BOX 221, CHRISTIANSBURG, VA 24068-0221
PO BOX 222, CHRISTIANSBURG, VA 24068-0222
PO BOX 223, CHRISTIANSBURG, VA 24068-0223
PO BOX 224, CHRISTIANSBURG, VA 24068-0224
PO BOX 225, CHRISTIANSBURG, VA 24068-0225
PO BOX 226, CHRISTIANSBURG, VA 24068-0226
PO BOX 227, CHRISTIANSBURG, VA 24068-0227
PO BOX 228, CHRISTIANSBURG, VA 24068-0228
PO BOX 229, CHRISTIANSBURG, VA 24068-0229
PO BOX 230, CHRISTIANSBURG, VA 24068-0230
PO BOX 231, CHRISTIANSBURG, VA 24068-0231
PO BOX 232, CHRISTIANSBURG, VA 24068-0232
PO BOX 233, CHRISTIANSBURG, VA 24068-0233
PO BOX 234, CHRISTIANSBURG, VA 24068-0234
PO BOX 235, CHRISTIANSBURG, VA 24068-0235
PO BOX 236, CHRISTIANSBURG, VA 24068-0236
PO BOX 237, CHRISTIANSBURG, VA 24068-0237
PO BOX 238, CHRISTIANSBURG, VA 24068-0238
PO BOX 239, CHRISTIANSBURG, VA 24068-0239
PO BOX 240, CHRISTIANSBURG, VA 24068-0240
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