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 1081, PORTERVILLE, CA 93258-1081
PO BOX 1082, PORTERVILLE, CA 93258-1082
PO BOX 1083, PORTERVILLE, CA 93258-1083
PO BOX 1084, PORTERVILLE, CA 93258-1084
PO BOX 1085, PORTERVILLE, CA 93258-1085
PO BOX 1086, PORTERVILLE, CA 93258-1086
PO BOX 1087, PORTERVILLE, CA 93258-1087
PO BOX 1088, PORTERVILLE, CA 93258-1088
PO BOX 1089, PORTERVILLE, CA 93258-1089
PO BOX 1090, PORTERVILLE, CA 93258-1090
PO BOX 1091, PORTERVILLE, CA 93258-1091
PO BOX 1092, PORTERVILLE, CA 93258-1092
PO BOX 1093, PORTERVILLE, CA 93258-1093
PO BOX 1094, PORTERVILLE, CA 93258-1094
PO BOX 1095, PORTERVILLE, CA 93258-1095
PO BOX 1096, PORTERVILLE, CA 93258-1096
PO BOX 1097, PORTERVILLE, CA 93258-1097
PO BOX 1098, PORTERVILLE, CA 93258-1098
PO BOX 1099, PORTERVILLE, CA 93258-1099
PO BOX 1100, PORTERVILLE, CA 93258-1100
PO BOX 1101, PORTERVILLE, CA 93258-1101
PO BOX 1102, PORTERVILLE, CA 93258-1102
PO BOX 1103, PORTERVILLE, CA 93258-1103
PO BOX 1104, PORTERVILLE, CA 93258-1104
PO BOX 1105, PORTERVILLE, CA 93258-1105
PO BOX 1106, PORTERVILLE, CA 93258-1106
PO BOX 1107, PORTERVILLE, CA 93258-1107
PO BOX 1108, PORTERVILLE, CA 93258-1108
PO BOX 1109, PORTERVILLE, CA 93258-1109
PO BOX 1110, PORTERVILLE, CA 93258-1110
PO BOX 1111, PORTERVILLE, CA 93258-1111
PO BOX 1112, PORTERVILLE, CA 93258-1112
PO BOX 1113, PORTERVILLE, CA 93258-1113
PO BOX 1114, PORTERVILLE, CA 93258-1114
PO BOX 1115, PORTERVILLE, CA 93258-1115
PO BOX 1116, PORTERVILLE, CA 93258-1116
PO BOX 1117, PORTERVILLE, CA 93258-1117
PO BOX 1118, PORTERVILLE, CA 93258-1118
PO BOX 1119, PORTERVILLE, CA 93258-1119
PO BOX 1120, PORTERVILLE, CA 93258-1120
PO BOX 1121, PORTERVILLE, CA 93258-1121
PO BOX 1122, PORTERVILLE, CA 93258-1122
PO BOX 1123, PORTERVILLE, CA 93258-1123
PO BOX 1124, PORTERVILLE, CA 93258-1124
PO BOX 1125, PORTERVILLE, CA 93258-1125
PO BOX 1126, PORTERVILLE, CA 93258-1126
PO BOX 1127, PORTERVILLE, CA 93258-1127
PO BOX 1128, PORTERVILLE, CA 93258-1128
PO BOX 1129, PORTERVILLE, CA 93258-1129
PO BOX 1130, PORTERVILLE, CA 93258-1130
PO BOX 1131, PORTERVILLE, CA 93258-1131
PO BOX 1132, PORTERVILLE, CA 93258-1132
PO BOX 1133, PORTERVILLE, CA 93258-1133
PO BOX 1134, PORTERVILLE, CA 93258-1134
PO BOX 1135, PORTERVILLE, CA 93258-1135
PO BOX 1136, PORTERVILLE, CA 93258-1136
PO BOX 1137, PORTERVILLE, CA 93258-1137
PO BOX 1138, PORTERVILLE, CA 93258-1138
PO BOX 1139, PORTERVILLE, CA 93258-1139
PO BOX 1140, PORTERVILLE, CA 93258-1140
PO BOX 1141, PORTERVILLE, CA 93258-1141
PO BOX 1142, PORTERVILLE, CA 93258-1142
PO BOX 1143, PORTERVILLE, CA 93258-1143
PO BOX 1144, PORTERVILLE, CA 93258-1144
PO BOX 1145, PORTERVILLE, CA 93258-1145
PO BOX 1146, PORTERVILLE, CA 93258-1146
PO BOX 1147, PORTERVILLE, CA 93258-1147
PO BOX 1148, PORTERVILLE, CA 93258-1148
PO BOX 1149, PORTERVILLE, CA 93258-1149
PO BOX 1150, PORTERVILLE, CA 93258-1150
PO BOX 1151, PORTERVILLE, CA 93258-1151
PO BOX 1152, PORTERVILLE, CA 93258-1152
PO BOX 1153, PORTERVILLE, CA 93258-1153
PO BOX 1154, PORTERVILLE, CA 93258-1154
PO BOX 1155, PORTERVILLE, CA 93258-1155
PO BOX 1156, PORTERVILLE, CA 93258-1156
PO BOX 1157, PORTERVILLE, CA 93258-1157
PO BOX 1158, PORTERVILLE, CA 93258-1158
PO BOX 1159, PORTERVILLE, CA 93258-1159
PO BOX 1160, PORTERVILLE, CA 93258-1160
PO BOX 1161, PORTERVILLE, CA 93258-1161
PO BOX 1162, PORTERVILLE, CA 93258-1162
PO BOX 1163, PORTERVILLE, CA 93258-1163
PO BOX 1164, PORTERVILLE, CA 93258-1164
PO BOX 1165, PORTERVILLE, CA 93258-1165
PO BOX 1166, PORTERVILLE, CA 93258-1166
PO BOX 1167, PORTERVILLE, CA 93258-1167
PO BOX 1168, PORTERVILLE, CA 93258-1168
PO BOX 1169, PORTERVILLE, CA 93258-1169
PO BOX 1170, PORTERVILLE, CA 93258-1170
PO BOX 1171, PORTERVILLE, CA 93258-1171
PO BOX 1172, PORTERVILLE, CA 93258-1172
PO BOX 1173, PORTERVILLE, CA 93258-1173
PO BOX 1174, PORTERVILLE, CA 93258-1174
PO BOX 1175, PORTERVILLE, CA 93258-1175
PO BOX 1176, PORTERVILLE, CA 93258-1176
PO BOX 1177, PORTERVILLE, CA 93258-1177
PO BOX 1178, PORTERVILLE, CA 93258-1178
PO BOX 1179, PORTERVILLE, CA 93258-1179
PO BOX 1180, PORTERVILLE, CA 93258-1180
PO BOX 1181, PORTERVILLE, CA 93258-1181
PO BOX 1182, PORTERVILLE, CA 93258-1182
PO BOX 1183, PORTERVILLE, CA 93258-1183
PO BOX 1184, PORTERVILLE, CA 93258-1184
PO BOX 1185, PORTERVILLE, CA 93258-1185
PO BOX 1186, PORTERVILLE, CA 93258-1186
PO BOX 1187, PORTERVILLE, CA 93258-1187
PO BOX 1188, PORTERVILLE, CA 93258-1188
PO BOX 1189, PORTERVILLE, CA 93258-1189
PO BOX 1190, PORTERVILLE, CA 93258-1190
PO BOX 1191, PORTERVILLE, CA 93258-1191
PO BOX 1192, PORTERVILLE, CA 93258-1192
PO BOX 1193, PORTERVILLE, CA 93258-1193
PO BOX 1194, PORTERVILLE, CA 93258-1194
PO BOX 1195, PORTERVILLE, CA 93258-1195
PO BOX 1196, PORTERVILLE, CA 93258-1196
PO BOX 1197, PORTERVILLE, CA 93258-1197
PO BOX 1198, PORTERVILLE, CA 93258-1198
PO BOX 1199, PORTERVILLE, CA 93258-1199
PO BOX 1200, PORTERVILLE, CA 93258-1200
PO BOX 1201, PORTERVILLE, CA 93258-1201
PO BOX 1202, PORTERVILLE, CA 93258-1202
PO BOX 1203, PORTERVILLE, CA 93258-1203
PO BOX 1204, PORTERVILLE, CA 93258-1204
PO BOX 1205, PORTERVILLE, CA 93258-1205
PO BOX 1206, PORTERVILLE, CA 93258-1206
PO BOX 1207, PORTERVILLE, CA 93258-1207
PO BOX 1208, PORTERVILLE, CA 93258-1208
PO BOX 1209, PORTERVILLE, CA 93258-1209
PO BOX 1210, PORTERVILLE, CA 93258-1210
PO BOX 1211, PORTERVILLE, CA 93258-1211
PO BOX 1212, PORTERVILLE, CA 93258-1212
PO BOX 1213, PORTERVILLE, CA 93258-1213
PO BOX 1214, PORTERVILLE, CA 93258-1214
PO BOX 1215, PORTERVILLE, CA 93258-1215
PO BOX 1216, PORTERVILLE, CA 93258-1216
PO BOX 1217, PORTERVILLE, CA 93258-1217
PO BOX 1218, PORTERVILLE, CA 93258-1218
PO BOX 1219, PORTERVILLE, CA 93258-1219
PO BOX 1220, PORTERVILLE, CA 93258-1220
PO BOX 1221, PORTERVILLE, CA 93258-1221
PO BOX 1222, PORTERVILLE, CA 93258-1222
PO BOX 1223, PORTERVILLE, CA 93258-1223
PO BOX 1224, PORTERVILLE, CA 93258-1224
PO BOX 1225, PORTERVILLE, CA 93258-1225
PO BOX 1226, PORTERVILLE, CA 93258-1226
PO BOX 1227, PORTERVILLE, CA 93258-1227
PO BOX 1228, PORTERVILLE, CA 93258-1228
PO BOX 1229, PORTERVILLE, CA 93258-1229
PO BOX 1230, PORTERVILLE, CA 93258-1230
PO BOX 1231, PORTERVILLE, CA 93258-1231
PO BOX 1232, PORTERVILLE, CA 93258-1232
PO BOX 1233, PORTERVILLE, CA 93258-1233
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