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, FREDERICKSBURG, VA 22404-0121
PO BOX 122, FREDERICKSBURG, VA 22404-0122
PO BOX 123, FREDERICKSBURG, VA 22404-0123
PO BOX 124, FREDERICKSBURG, VA 22404-0124
PO BOX 125, FREDERICKSBURG, VA 22404-0125
PO BOX 126, FREDERICKSBURG, VA 22404-0126
PO BOX 127, FREDERICKSBURG, VA 22404-0127
PO BOX 128, FREDERICKSBURG, VA 22404-0128
PO BOX 129, FREDERICKSBURG, VA 22404-0129
PO BOX 130, FREDERICKSBURG, VA 22404-0130
PO BOX 131, FREDERICKSBURG, VA 22404-0131
PO BOX 132, FREDERICKSBURG, VA 22404-0132
PO BOX 133, FREDERICKSBURG, VA 22404-0133
PO BOX 134, FREDERICKSBURG, VA 22404-0134
PO BOX 135, FREDERICKSBURG, VA 22404-0135
PO BOX 136, FREDERICKSBURG, VA 22404-0136
PO BOX 137, FREDERICKSBURG, VA 22404-0137
PO BOX 138, FREDERICKSBURG, VA 22404-0138
PO BOX 139, FREDERICKSBURG, VA 22404-0139
PO BOX 140, FREDERICKSBURG, VA 22404-0140
PO BOX 141, FREDERICKSBURG, VA 22404-0141
PO BOX 142, FREDERICKSBURG, VA 22404-0142
PO BOX 143, FREDERICKSBURG, VA 22404-0143
PO BOX 144, FREDERICKSBURG, VA 22404-0144
PO BOX 145, FREDERICKSBURG, VA 22404-0145
PO BOX 146, FREDERICKSBURG, VA 22404-0146
PO BOX 147, FREDERICKSBURG, VA 22404-0147
PO BOX 148, FREDERICKSBURG, VA 22404-0148
PO BOX 149, FREDERICKSBURG, VA 22404-0149
PO BOX 150, FREDERICKSBURG, VA 22404-0150
PO BOX 151, FREDERICKSBURG, VA 22404-0151
PO BOX 152, FREDERICKSBURG, VA 22404-0152
PO BOX 153, FREDERICKSBURG, VA 22404-0153
PO BOX 154, FREDERICKSBURG, VA 22404-0154
PO BOX 155, FREDERICKSBURG, VA 22404-0155
PO BOX 156, FREDERICKSBURG, VA 22404-0156
PO BOX 157, FREDERICKSBURG, VA 22404-0157
PO BOX 158, FREDERICKSBURG, VA 22404-0158
PO BOX 159, FREDERICKSBURG, VA 22404-0159
PO BOX 160, FREDERICKSBURG, VA 22404-0160
PO BOX 161, FREDERICKSBURG, VA 22404-0161
PO BOX 162, FREDERICKSBURG, VA 22404-0162
PO BOX 163, FREDERICKSBURG, VA 22404-0163
PO BOX 164, FREDERICKSBURG, VA 22404-0164
PO BOX 165, FREDERICKSBURG, VA 22404-0165
PO BOX 166, FREDERICKSBURG, VA 22404-0166
PO BOX 167, FREDERICKSBURG, VA 22404-0167
PO BOX 168, FREDERICKSBURG, VA 22404-0168
PO BOX 169, FREDERICKSBURG, VA 22404-0169
PO BOX 170, FREDERICKSBURG, VA 22404-0170
PO BOX 171, FREDERICKSBURG, VA 22404-0171
PO BOX 172, FREDERICKSBURG, VA 22404-0172
PO BOX 173, FREDERICKSBURG, VA 22404-0173
PO BOX 174, FREDERICKSBURG, VA 22404-0174
PO BOX 175, FREDERICKSBURG, VA 22404-0175
PO BOX 176, FREDERICKSBURG, VA 22404-0176
PO BOX 177, FREDERICKSBURG, VA 22404-0177
PO BOX 178, FREDERICKSBURG, VA 22404-0178
PO BOX 179, FREDERICKSBURG, VA 22404-0179
PO BOX 180, FREDERICKSBURG, VA 22404-0180
PO BOX 181, FREDERICKSBURG, VA 22404-0181
PO BOX 182, FREDERICKSBURG, VA 22404-0182
PO BOX 183, FREDERICKSBURG, VA 22404-0183
PO BOX 184, FREDERICKSBURG, VA 22404-0184
PO BOX 185, FREDERICKSBURG, VA 22404-0185
PO BOX 186, FREDERICKSBURG, VA 22404-0186
PO BOX 187, FREDERICKSBURG, VA 22404-0187
PO BOX 188, FREDERICKSBURG, VA 22404-0188
PO BOX 189, FREDERICKSBURG, VA 22404-0189
PO BOX 190, FREDERICKSBURG, VA 22404-0190
PO BOX 191, FREDERICKSBURG, VA 22404-0191
PO BOX 192, FREDERICKSBURG, VA 22404-0192
PO BOX 193, FREDERICKSBURG, VA 22404-0193
PO BOX 194, FREDERICKSBURG, VA 22404-0194
PO BOX 195, FREDERICKSBURG, VA 22404-0195
PO BOX 196, FREDERICKSBURG, VA 22404-0196
PO BOX 197, FREDERICKSBURG, VA 22404-0197
PO BOX 198, FREDERICKSBURG, VA 22404-0198
PO BOX 199, FREDERICKSBURG, VA 22404-0199
PO BOX 200, FREDERICKSBURG, VA 22404-0200
PO BOX 201, FREDERICKSBURG, VA 22404-0201
PO BOX 202, FREDERICKSBURG, VA 22404-0202
PO BOX 203, FREDERICKSBURG, VA 22404-0203
PO BOX 204, FREDERICKSBURG, VA 22404-0204
PO BOX 205, FREDERICKSBURG, VA 22404-0205
PO BOX 206, FREDERICKSBURG, VA 22404-0206
PO BOX 207, FREDERICKSBURG, VA 22404-0207
PO BOX 208, FREDERICKSBURG, VA 22404-0208
PO BOX 209, FREDERICKSBURG, VA 22404-0209
PO BOX 210, FREDERICKSBURG, VA 22404-0210
PO BOX 211, FREDERICKSBURG, VA 22404-0211
PO BOX 212, FREDERICKSBURG, VA 22404-0212
PO BOX 213, FREDERICKSBURG, VA 22404-0213
PO BOX 214, FREDERICKSBURG, VA 22404-0214
PO BOX 215, FREDERICKSBURG, VA 22404-0215
PO BOX 216, FREDERICKSBURG, VA 22404-0216
PO BOX 217, FREDERICKSBURG, VA 22404-0217
PO BOX 218, FREDERICKSBURG, VA 22404-0218
PO BOX 219, FREDERICKSBURG, VA 22404-0219
PO BOX 220, FREDERICKSBURG, VA 22404-0220
PO BOX 221, FREDERICKSBURG, VA 22404-0221
PO BOX 222, FREDERICKSBURG, VA 22404-0222
PO BOX 223, FREDERICKSBURG, VA 22404-0223
PO BOX 224, FREDERICKSBURG, VA 22404-0224
PO BOX 225, FREDERICKSBURG, VA 22404-0225
PO BOX 226, FREDERICKSBURG, VA 22404-0226
PO BOX 227, FREDERICKSBURG, VA 22404-0227
PO BOX 228, FREDERICKSBURG, VA 22404-0228
PO BOX 229, FREDERICKSBURG, VA 22404-0229
PO BOX 230, FREDERICKSBURG, VA 22404-0230
PO BOX 231, FREDERICKSBURG, VA 22404-0231
PO BOX 232, FREDERICKSBURG, VA 22404-0232
PO BOX 233, FREDERICKSBURG, VA 22404-0233
PO BOX 234, FREDERICKSBURG, VA 22404-0234
PO BOX 235, FREDERICKSBURG, VA 22404-0235
PO BOX 236, FREDERICKSBURG, VA 22404-0236
PO BOX 237, FREDERICKSBURG, VA 22404-0237
PO BOX 238, FREDERICKSBURG, VA 22404-0238
PO BOX 239, FREDERICKSBURG, VA 22404-0239
PO BOX 240, FREDERICKSBURG, VA 22404-0240
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