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 1101, GREEN COVE SPRINGS, FL 32043-1101
PO BOX 1102, GREEN COVE SPRINGS, FL 32043-1102
PO BOX 1103, GREEN COVE SPRINGS, FL 32043-1103
PO BOX 1104, GREEN COVE SPRINGS, FL 32043-1104
PO BOX 1105, GREEN COVE SPRINGS, FL 32043-1105
PO BOX 1106, GREEN COVE SPRINGS, FL 32043-1106
PO BOX 1107, GREEN COVE SPRINGS, FL 32043-1107
PO BOX 1108, GREEN COVE SPRINGS, FL 32043-1108
PO BOX 1109, GREEN COVE SPRINGS, FL 32043-1109
PO BOX 1110, GREEN COVE SPRINGS, FL 32043-1110
PO BOX 1111, GREEN COVE SPRINGS, FL 32043-1111
PO BOX 1112, GREEN COVE SPRINGS, FL 32043-1112
PO BOX 1113, GREEN COVE SPRINGS, FL 32043-1113
PO BOX 1114, GREEN COVE SPRINGS, FL 32043-1114
PO BOX 1115, GREEN COVE SPRINGS, FL 32043-1115
PO BOX 1116, GREEN COVE SPRINGS, FL 32043-1116
PO BOX 1117, GREEN COVE SPRINGS, FL 32043-1117
PO BOX 1118, GREEN COVE SPRINGS, FL 32043-1118
PO BOX 1119, GREEN COVE SPRINGS, FL 32043-1119
PO BOX 1120, GREEN COVE SPRINGS, FL 32043-1120
PO BOX 1121, GREEN COVE SPRINGS, FL 32043-1121
PO BOX 1122, GREEN COVE SPRINGS, FL 32043-1122
PO BOX 1123, GREEN COVE SPRINGS, FL 32043-1123
PO BOX 1124, GREEN COVE SPRINGS, FL 32043-1124
PO BOX 1125, GREEN COVE SPRINGS, FL 32043-1125
PO BOX 1126, GREEN COVE SPRINGS, FL 32043-1126
PO BOX 1127, GREEN COVE SPRINGS, FL 32043-1127
PO BOX 1128, GREEN COVE SPRINGS, FL 32043-1128
PO BOX 1129, GREEN COVE SPRINGS, FL 32043-1129
PO BOX 1130, GREEN COVE SPRINGS, FL 32043-1130
PO BOX 1131, GREEN COVE SPRINGS, FL 32043-1131
PO BOX 1132, GREEN COVE SPRINGS, FL 32043-1132
PO BOX 1133, GREEN COVE SPRINGS, FL 32043-1133
PO BOX 1134, GREEN COVE SPRINGS, FL 32043-1134
PO BOX 1135, GREEN COVE SPRINGS, FL 32043-1135
PO BOX 1136, GREEN COVE SPRINGS, FL 32043-1136
PO BOX 1137, GREEN COVE SPRINGS, FL 32043-1137
PO BOX 1138, GREEN COVE SPRINGS, FL 32043-1138
PO BOX 1139, GREEN COVE SPRINGS, FL 32043-1139
PO BOX 1140, GREEN COVE SPRINGS, FL 32043-1140
PO BOX 1141, GREEN COVE SPRINGS, FL 32043-1141
PO BOX 1142, GREEN COVE SPRINGS, FL 32043-1142
PO BOX 1143, GREEN COVE SPRINGS, FL 32043-1143
PO BOX 1144, GREEN COVE SPRINGS, FL 32043-1144
PO BOX 1145, GREEN COVE SPRINGS, FL 32043-1145
PO BOX 1146, GREEN COVE SPRINGS, FL 32043-1146
PO BOX 1147, GREEN COVE SPRINGS, FL 32043-1147
PO BOX 1148, GREEN COVE SPRINGS, FL 32043-1148
PO BOX 1149, GREEN COVE SPRINGS, FL 32043-1149
PO BOX 1150, GREEN COVE SPRINGS, FL 32043-1150
PO BOX 1151, GREEN COVE SPRINGS, FL 32043-1151
PO BOX 1152, GREEN COVE SPRINGS, FL 32043-1152
PO BOX 1153, GREEN COVE SPRINGS, FL 32043-1153
PO BOX 1154, GREEN COVE SPRINGS, FL 32043-1154
PO BOX 1155, GREEN COVE SPRINGS, FL 32043-1155
PO BOX 1156, GREEN COVE SPRINGS, FL 32043-1156
PO BOX 1157, GREEN COVE SPRINGS, FL 32043-1157
PO BOX 1158, GREEN COVE SPRINGS, FL 32043-1158
PO BOX 1159, GREEN COVE SPRINGS, FL 32043-1159
PO BOX 1160, GREEN COVE SPRINGS, FL 32043-1160
PO BOX 1161, GREEN COVE SPRINGS, FL 32043-1161
PO BOX 1162, GREEN COVE SPRINGS, FL 32043-1162
PO BOX 1163, GREEN COVE SPRINGS, FL 32043-1163
PO BOX 1164, GREEN COVE SPRINGS, FL 32043-1164
PO BOX 1165, GREEN COVE SPRINGS, FL 32043-1165
PO BOX 1166, GREEN COVE SPRINGS, FL 32043-1166
PO BOX 1167, GREEN COVE SPRINGS, FL 32043-1167
PO BOX 1168, GREEN COVE SPRINGS, FL 32043-1168
PO BOX 1169, GREEN COVE SPRINGS, FL 32043-1169
PO BOX 1170, GREEN COVE SPRINGS, FL 32043-1170
PO BOX 1171, GREEN COVE SPRINGS, FL 32043-1171
PO BOX 1172, GREEN COVE SPRINGS, FL 32043-1172
PO BOX 1173, GREEN COVE SPRINGS, FL 32043-1173
PO BOX 1174, GREEN COVE SPRINGS, FL 32043-1174
PO BOX 1175, GREEN COVE SPRINGS, FL 32043-1175
PO BOX 1176, GREEN COVE SPRINGS, FL 32043-1176
PO BOX 1177, GREEN COVE SPRINGS, FL 32043-1177
PO BOX 1178, GREEN COVE SPRINGS, FL 32043-1178
PO BOX 1179, GREEN COVE SPRINGS, FL 32043-1179
PO BOX 1180, GREEN COVE SPRINGS, FL 32043-1180
PO BOX 1181, GREEN COVE SPRINGS, FL 32043-1181
PO BOX 1182, GREEN COVE SPRINGS, FL 32043-1182
PO BOX 1183, GREEN COVE SPRINGS, FL 32043-1183
PO BOX 1184, GREEN COVE SPRINGS, FL 32043-1184
PO BOX 1185, GREEN COVE SPRINGS, FL 32043-1185
PO BOX 1186, GREEN COVE SPRINGS, FL 32043-1186
PO BOX 1187, GREEN COVE SPRINGS, FL 32043-1187
PO BOX 1188, GREEN COVE SPRINGS, FL 32043-1188
PO BOX 1189, GREEN COVE SPRINGS, FL 32043-1189
PO BOX 1190, GREEN COVE SPRINGS, FL 32043-1190
PO BOX 1191, GREEN COVE SPRINGS, FL 32043-1191
PO BOX 1192, GREEN COVE SPRINGS, FL 32043-1192
PO BOX 1193, GREEN COVE SPRINGS, FL 32043-1193
PO BOX 1194, GREEN COVE SPRINGS, FL 32043-1194
PO BOX 1195, GREEN COVE SPRINGS, FL 32043-1195
PO BOX 1196, GREEN COVE SPRINGS, FL 32043-1196
PO BOX 1197, GREEN COVE SPRINGS, FL 32043-1197
PO BOX 1198, GREEN COVE SPRINGS, FL 32043-1198
PO BOX 1199, GREEN COVE SPRINGS, FL 32043-1199
PO BOX 1200, GREEN COVE SPRINGS, FL 32043-1200
PO BOX 1201, GREEN COVE SPRINGS, FL 32043-1201
PO BOX 1202, GREEN COVE SPRINGS, FL 32043-1202
PO BOX 1203, GREEN COVE SPRINGS, FL 32043-1203
PO BOX 1204, GREEN COVE SPRINGS, FL 32043-1204
PO BOX 1205, GREEN COVE SPRINGS, FL 32043-1205
PO BOX 1206, GREEN COVE SPRINGS, FL 32043-1206
PO BOX 1207, GREEN COVE SPRINGS, FL 32043-1207
PO BOX 1208, GREEN COVE SPRINGS, FL 32043-1208
PO BOX 1209, GREEN COVE SPRINGS, FL 32043-1209
PO BOX 1210, GREEN COVE SPRINGS, FL 32043-1210
PO BOX 1211, GREEN COVE SPRINGS, FL 32043-1211
PO BOX 1212, GREEN COVE SPRINGS, FL 32043-1212
PO BOX 1213, GREEN COVE SPRINGS, FL 32043-1213
PO BOX 1214, GREEN COVE SPRINGS, FL 32043-1214
PO BOX 1215, GREEN COVE SPRINGS, FL 32043-1215
PO BOX 1216, GREEN COVE SPRINGS, FL 32043-1216
PO BOX 1217, GREEN COVE SPRINGS, FL 32043-1217
PO BOX 1218, GREEN COVE SPRINGS, FL 32043-1218
PO BOX 1219, GREEN COVE SPRINGS, FL 32043-1219
PO BOX 1220, GREEN COVE SPRINGS, FL 32043-1220
PO BOX 1221, GREEN COVE SPRINGS, FL 32043-1221
PO BOX 1222, GREEN COVE SPRINGS, FL 32043-1222
PO BOX 1223, GREEN COVE SPRINGS, FL 32043-1223
PO BOX 1224, GREEN COVE SPRINGS, FL 32043-1224
PO BOX 1225, GREEN COVE SPRINGS, FL 32043-1225
PO BOX 1226, GREEN COVE SPRINGS, FL 32043-1226
PO BOX 1227, GREEN COVE SPRINGS, FL 32043-1227
PO BOX 1228, GREEN COVE SPRINGS, FL 32043-1228
PO BOX 1229, GREEN COVE SPRINGS, FL 32043-1229
PO BOX 1230, GREEN COVE SPRINGS, FL 32043-1230
PO BOX 1231, GREEN COVE SPRINGS, FL 32043-1231
PO BOX 1232, GREEN COVE SPRINGS, FL 32043-1232
PO BOX 1233, GREEN COVE SPRINGS, FL 32043-1233
PO BOX 1234, GREEN COVE SPRINGS, FL 32043-1234
PO BOX 1235, GREEN COVE SPRINGS, FL 32043-1235
PO BOX 1236, GREEN COVE SPRINGS, FL 32043-1236
PO BOX 1237, GREEN COVE SPRINGS, FL 32043-1237
PO BOX 1238, GREEN COVE SPRINGS, FL 32043-1238
PO BOX 1239, GREEN COVE SPRINGS, FL 32043-1239
PO BOX 1240, GREEN COVE SPRINGS, FL 32043-1240
PO BOX 1241, GREEN COVE SPRINGS, FL 32043-1241
PO BOX 1242, GREEN COVE SPRINGS, FL 32043-1242
PO BOX 1243, GREEN COVE SPRINGS, FL 32043-1243
PO BOX 1244, GREEN COVE SPRINGS, FL 32043-1244
PO BOX 1245, GREEN COVE SPRINGS, FL 32043-1245
PO BOX 1246, GREEN COVE SPRINGS, FL 32043-1246
PO BOX 1247, GREEN COVE SPRINGS, FL 32043-1247
PO BOX 1248, GREEN COVE SPRINGS, FL 32043-1248
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