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 11081, BLACKSBURG, VA 24062-1081
PO BOX 11082, BLACKSBURG, VA 24062-1082
PO BOX 11083, BLACKSBURG, VA 24062-1083
PO BOX 11084, BLACKSBURG, VA 24062-1084
PO BOX 11085, BLACKSBURG, VA 24062-1085
PO BOX 11086, BLACKSBURG, VA 24062-1086
PO BOX 11087, BLACKSBURG, VA 24062-1087
PO BOX 11088, BLACKSBURG, VA 24062-1088
PO BOX 11089, BLACKSBURG, VA 24062-1089
PO BOX 11090, BLACKSBURG, VA 24062-1090
PO BOX 11091, BLACKSBURG, VA 24062-1091
PO BOX 11092, BLACKSBURG, VA 24062-1092
PO BOX 11093, BLACKSBURG, VA 24062-1093
PO BOX 11094, BLACKSBURG, VA 24062-1094
PO BOX 11095, BLACKSBURG, VA 24062-1095
PO BOX 11096, BLACKSBURG, VA 24062-1096
PO BOX 11097, BLACKSBURG, VA 24062-1097
PO BOX 11098, BLACKSBURG, VA 24062-1098
PO BOX 11099, BLACKSBURG, VA 24062-1099
PO BOX 11100, BLACKSBURG, VA 24062-1100
PO BOX 11101, BLACKSBURG, VA 24062-1101
PO BOX 11102, BLACKSBURG, VA 24062-1102
PO BOX 11103, BLACKSBURG, VA 24062-1103
PO BOX 11104, BLACKSBURG, VA 24062-1104
PO BOX 11105, BLACKSBURG, VA 24062-1105
PO BOX 11106, BLACKSBURG, VA 24062-1106
PO BOX 11107, BLACKSBURG, VA 24062-1107
PO BOX 11108, BLACKSBURG, VA 24062-1108
PO BOX 11109, BLACKSBURG, VA 24062-1109
PO BOX 11110, BLACKSBURG, VA 24062-1110
PO BOX 11111, BLACKSBURG, VA 24062-1111
PO BOX 11112, BLACKSBURG, VA 24062-1112
PO BOX 11113, BLACKSBURG, VA 24062-1113
PO BOX 11114, BLACKSBURG, VA 24062-1114
PO BOX 11115, BLACKSBURG, VA 24062-1115
PO BOX 11116, BLACKSBURG, VA 24062-1116
PO BOX 11117, BLACKSBURG, VA 24062-1117
PO BOX 11118, BLACKSBURG, VA 24062-1118
PO BOX 11119, BLACKSBURG, VA 24062-1119
PO BOX 11120, BLACKSBURG, VA 24062-1120
PO BOX 11121, BLACKSBURG, VA 24062-1121
PO BOX 11122, BLACKSBURG, VA 24062-1122
PO BOX 11123, BLACKSBURG, VA 24062-1123
PO BOX 11124, BLACKSBURG, VA 24062-1124
PO BOX 11125, BLACKSBURG, VA 24062-1125
PO BOX 11126, BLACKSBURG, VA 24062-1126
PO BOX 11127, BLACKSBURG, VA 24062-1127
PO BOX 11128, BLACKSBURG, VA 24062-1128
PO BOX 11129, BLACKSBURG, VA 24062-1129
PO BOX 11130, BLACKSBURG, VA 24062-1130
PO BOX 11131, BLACKSBURG, VA 24062-1131
PO BOX 11132, BLACKSBURG, VA 24062-1132
PO BOX 11133, BLACKSBURG, VA 24062-1133
PO BOX 11134, BLACKSBURG, VA 24062-1134
PO BOX 11135, BLACKSBURG, VA 24062-1135
PO BOX 11136, BLACKSBURG, VA 24062-1136
PO BOX 11137, BLACKSBURG, VA 24062-1137
PO BOX 11138, BLACKSBURG, VA 24062-1138
PO BOX 11139, BLACKSBURG, VA 24062-1139
PO BOX 11140, BLACKSBURG, VA 24062-1140
PO BOX 11141, BLACKSBURG, VA 24062-1141
PO BOX 11142, BLACKSBURG, VA 24062-1142
PO BOX 11143, BLACKSBURG, VA 24062-1143
PO BOX 11144, BLACKSBURG, VA 24062-1144
PO BOX 11145, BLACKSBURG, VA 24062-1145
PO BOX 11146, BLACKSBURG, VA 24062-1146
PO BOX 11147, BLACKSBURG, VA 24062-1147
PO BOX 11148, BLACKSBURG, VA 24062-1148
PO BOX 11149, BLACKSBURG, VA 24062-1149
PO BOX 11150, BLACKSBURG, VA 24062-1150
PO BOX 11151, BLACKSBURG, VA 24062-1151
PO BOX 11152, BLACKSBURG, VA 24062-1152
PO BOX 11153, BLACKSBURG, VA 24062-1153
PO BOX 11154, BLACKSBURG, VA 24062-1154
PO BOX 11155, BLACKSBURG, VA 24062-1155
PO BOX 11156, BLACKSBURG, VA 24062-1156
PO BOX 11157, BLACKSBURG, VA 24062-1157
PO BOX 11158, BLACKSBURG, VA 24062-1158
PO BOX 11159, BLACKSBURG, VA 24062-1159
PO BOX 11160, BLACKSBURG, VA 24062-1160
PO BOX 11161, BLACKSBURG, VA 24062-1161
PO BOX 11162, BLACKSBURG, VA 24062-1162
PO BOX 11163, BLACKSBURG, VA 24062-1163
PO BOX 11164, BLACKSBURG, VA 24062-1164
PO BOX 11165, BLACKSBURG, VA 24062-1165
PO BOX 11166, BLACKSBURG, VA 24062-1166
PO BOX 11167, BLACKSBURG, VA 24062-1167
PO BOX 11168, BLACKSBURG, VA 24062-1168
PO BOX 11169, BLACKSBURG, VA 24062-1169
PO BOX 11170, BLACKSBURG, VA 24062-1170
PO BOX 11171, BLACKSBURG, VA 24062-1171
PO BOX 11172, BLACKSBURG, VA 24062-1172
PO BOX 11173, BLACKSBURG, VA 24062-1173
PO BOX 11174, BLACKSBURG, VA 24062-1174
PO BOX 11175, BLACKSBURG, VA 24062-1175
PO BOX 11176, BLACKSBURG, VA 24062-1176
PO BOX 11177, BLACKSBURG, VA 24062-1177
PO BOX 11178, BLACKSBURG, VA 24062-1178
PO BOX 11179, BLACKSBURG, VA 24062-1179
PO BOX 11180, BLACKSBURG, VA 24062-1180
PO BOX 11181, BLACKSBURG, VA 24062-1181
PO BOX 11182, BLACKSBURG, VA 24062-1182
PO BOX 11183, BLACKSBURG, VA 24062-1183
PO BOX 11184, BLACKSBURG, VA 24062-1184
PO BOX 11185, BLACKSBURG, VA 24062-1185
PO BOX 11186, BLACKSBURG, VA 24062-1186
PO BOX 11187, BLACKSBURG, VA 24062-1187
PO BOX 11188, BLACKSBURG, VA 24062-1188
PO BOX 11189, BLACKSBURG, VA 24062-1189
PO BOX 11190, BLACKSBURG, VA 24062-1190
PO BOX 11191, BLACKSBURG, VA 24062-1191
PO BOX 11192, BLACKSBURG, VA 24062-1192
PO BOX 11193, BLACKSBURG, VA 24062-1193
PO BOX 11194, BLACKSBURG, VA 24062-1194
PO BOX 11195, BLACKSBURG, VA 24062-1195
PO BOX 11196, BLACKSBURG, VA 24062-1196
PO BOX 11197, BLACKSBURG, VA 24062-1197
PO BOX 11198, BLACKSBURG, VA 24062-1198
PO BOX 11199, BLACKSBURG, VA 24062-1199
PO BOX 11200, BLACKSBURG, VA 24062-1200
PO BOX 11201, BLACKSBURG, VA 24062-1201
PO BOX 11202, BLACKSBURG, VA 24062-1202
PO BOX 11203, BLACKSBURG, VA 24062-1203
PO BOX 11204, BLACKSBURG, VA 24062-1204
PO BOX 11205, BLACKSBURG, VA 24062-1205
PO BOX 11206, BLACKSBURG, VA 24062-1206
PO BOX 11207, BLACKSBURG, VA 24062-1207
PO BOX 11208, BLACKSBURG, VA 24062-1208
PO BOX 11209, BLACKSBURG, VA 24062-1209
PO BOX 11210, BLACKSBURG, VA 24062-1210
PO BOX 11211, BLACKSBURG, VA 24062-1211
PO BOX 11212, BLACKSBURG, VA 24062-1212
PO BOX 11213, BLACKSBURG, VA 24062-1213
PO BOX 11214, BLACKSBURG, VA 24062-1214
PO BOX 11215, BLACKSBURG, VA 24062-1215
PO BOX 11216, BLACKSBURG, VA 24062-1216
PO BOX 11217, BLACKSBURG, VA 24062-1217
PO BOX 11218, BLACKSBURG, VA 24062-1218
PO BOX 11219, BLACKSBURG, VA 24062-1219
PO BOX 11220, BLACKSBURG, VA 24062-1220
PO BOX 11221, BLACKSBURG, VA 24062-1221
PO BOX 11222, BLACKSBURG, VA 24062-1222
PO BOX 11223, BLACKSBURG, VA 24062-1223
PO BOX 11224, BLACKSBURG, VA 24062-1224
PO BOX 11225, BLACKSBURG, VA 24062-1225
PO BOX 11226, BLACKSBURG, VA 24062-1226
PO BOX 11227, BLACKSBURG, VA 24062-1227
PO BOX 11228, BLACKSBURG, VA 24062-1228
PO BOX 11229, BLACKSBURG, VA 24062-1229
PO BOX 11230, BLACKSBURG, VA 24062-1230
PO BOX 11231, BLACKSBURG, VA 24062-1231
PO BOX 11232, BLACKSBURG, VA 24062-1232
PO BOX 11233, BLACKSBURG, VA 24062-1233
PO BOX 11234, BLACKSBURG, VA 24062-1234
PO BOX 11235, BLACKSBURG, VA 24062-1235
PO BOX 11236, BLACKSBURG, VA 24062-1236
PO BOX 11237, BLACKSBURG, VA 24062-1237
PO BOX 11238, BLACKSBURG, VA 24062-1238
PO BOX 11239, BLACKSBURG, VA 24062-1239
PO BOX 11240, BLACKSBURG, VA 24062-1240
PO BOX 11241, BLACKSBURG, VA 24062-1241
PO BOX 11242, BLACKSBURG, VA 24062-1242
PO BOX 11243, BLACKSBURG, VA 24062-1243
PO BOX 11244, BLACKSBURG, VA 24062-1244
PO BOX 11245, BLACKSBURG, VA 24062-1245
PO BOX 11246, BLACKSBURG, VA 24062-1246
PO BOX 11247, BLACKSBURG, VA 24062-1247
PO BOX 11248, BLACKSBURG, VA 24062-1248
PO BOX 11249, BLACKSBURG, VA 24062-1249
PO BOX 11250, BLACKSBURG, VA 24062-1250
PO BOX 11251, BLACKSBURG, VA 24062-1251
PO BOX 11252, BLACKSBURG, VA 24062-1252
PO BOX 11253, BLACKSBURG, VA 24062-1253
PO BOX 11254, BLACKSBURG, VA 24062-1254
PO BOX 11255, BLACKSBURG, VA 24062-1255
PO BOX 11256, BLACKSBURG, VA 24062-1256
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