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 1021, CLINTON, NC 28329-1021
PO BOX 1022, CLINTON, NC 28329-1022
PO BOX 1023, CLINTON, NC 28329-1023
PO BOX 1024, CLINTON, NC 28329-1024
PO BOX 1025, CLINTON, NC 28329-1025
PO BOX 1026, CLINTON, NC 28329-1026
PO BOX 1027, CLINTON, NC 28329-1027
PO BOX 1028, CLINTON, NC 28329-1028
PO BOX 1029, CLINTON, NC 28329-1029
PO BOX 1030, CLINTON, NC 28329-1030
PO BOX 1031, CLINTON, NC 28329-1031
PO BOX 1032, CLINTON, NC 28329-1032
PO BOX 1033, CLINTON, NC 28329-1033
PO BOX 1034, CLINTON, NC 28329-1034
PO BOX 1035, CLINTON, NC 28329-1035
PO BOX 1036, CLINTON, NC 28329-1036
PO BOX 1037, CLINTON, NC 28329-1037
PO BOX 1038, CLINTON, NC 28329-1038
PO BOX 1039, CLINTON, NC 28329-1039
PO BOX 1040, CLINTON, NC 28329-1040
PO BOX 1041, CLINTON, NC 28329-1041
PO BOX 1042, CLINTON, NC 28329-1042
PO BOX 1043, CLINTON, NC 28329-1043
PO BOX 1044, CLINTON, NC 28329-1044
PO BOX 1045, CLINTON, NC 28329-1045
PO BOX 1046, CLINTON, NC 28329-1046
PO BOX 1047, CLINTON, NC 28329-1047
PO BOX 1048, CLINTON, NC 28329-1048
PO BOX 1049, CLINTON, NC 28329-1049
PO BOX 1050, CLINTON, NC 28329-1050
PO BOX 1051, CLINTON, NC 28329-1051
PO BOX 1052, CLINTON, NC 28329-1052
PO BOX 1053, CLINTON, NC 28329-1053
PO BOX 1054, CLINTON, NC 28329-1054
PO BOX 1055, CLINTON, NC 28329-1055
PO BOX 1056, CLINTON, NC 28329-1056
PO BOX 1057, CLINTON, NC 28329-1057
PO BOX 1058, CLINTON, NC 28329-1058
PO BOX 1059, CLINTON, NC 28329-1059
PO BOX 1060, CLINTON, NC 28329-1060
PO BOX 1061, CLINTON, NC 28329-1061
PO BOX 1062, CLINTON, NC 28329-1062
PO BOX 1063, CLINTON, NC 28329-1063
PO BOX 1064, CLINTON, NC 28329-1064
PO BOX 1065, CLINTON, NC 28329-1065
PO BOX 1066, CLINTON, NC 28329-1066
PO BOX 1067, CLINTON, NC 28329-1067
PO BOX 1068, CLINTON, NC 28329-1068
PO BOX 1069, CLINTON, NC 28329-1069
PO BOX 1070, CLINTON, NC 28329-1070
PO BOX 1071, CLINTON, NC 28329-1071
PO BOX 1072, CLINTON, NC 28329-1072
PO BOX 1073, CLINTON, NC 28329-1073
PO BOX 1074, CLINTON, NC 28329-1074
PO BOX 1075, CLINTON, NC 28329-1075
PO BOX 1076, CLINTON, NC 28329-1076
PO BOX 1077, CLINTON, NC 28329-1077
PO BOX 1078, CLINTON, NC 28329-1078
PO BOX 1079, CLINTON, NC 28329-1079
PO BOX 1080, CLINTON, NC 28329-1080
PO BOX 1081, CLINTON, NC 28329-1081
PO BOX 1082, CLINTON, NC 28329-1082
PO BOX 1083, CLINTON, NC 28329-1083
PO BOX 1084, CLINTON, NC 28329-1084
PO BOX 1085, CLINTON, NC 28329-1085
PO BOX 1086, CLINTON, NC 28329-1086
PO BOX 1087, CLINTON, NC 28329-1087
PO BOX 1088, CLINTON, NC 28329-1088
PO BOX 1089, CLINTON, NC 28329-1089
PO BOX 1090, CLINTON, NC 28329-1090
PO BOX 1091, CLINTON, NC 28329-1091
PO BOX 1092, CLINTON, NC 28329-1092
PO BOX 1093, CLINTON, NC 28329-1093
PO BOX 1094, CLINTON, NC 28329-1094
PO BOX 1095, CLINTON, NC 28329-1095
PO BOX 1096, CLINTON, NC 28329-1096
PO BOX 1097, CLINTON, NC 28329-1097
PO BOX 1098, CLINTON, NC 28329-1098
PO BOX 1099, CLINTON, NC 28329-1099
PO BOX 1100, CLINTON, NC 28329-1100
PO BOX 1101, CLINTON, NC 28329-1101
PO BOX 1102, CLINTON, NC 28329-1102
PO BOX 1103, CLINTON, NC 28329-1103
PO BOX 1104, CLINTON, NC 28329-1104
PO BOX 1105, CLINTON, NC 28329-1105
PO BOX 1106, CLINTON, NC 28329-1106
PO BOX 1107, CLINTON, NC 28329-1107
PO BOX 1108, CLINTON, NC 28329-1108
PO BOX 1109, CLINTON, NC 28329-1109
PO BOX 1110, CLINTON, NC 28329-1110
PO BOX 1111, CLINTON, NC 28329-1111
PO BOX 1112, CLINTON, NC 28329-1112
PO BOX 1113, CLINTON, NC 28329-1113
PO BOX 1114, CLINTON, NC 28329-1114
PO BOX 1115, CLINTON, NC 28329-1115
PO BOX 1116, CLINTON, NC 28329-1116
PO BOX 1117, CLINTON, NC 28329-1117
PO BOX 1118, CLINTON, NC 28329-1118
PO BOX 1119, CLINTON, NC 28329-1119
PO BOX 1120, CLINTON, NC 28329-1120
PO BOX 1121, CLINTON, NC 28329-1121
PO BOX 1122, CLINTON, NC 28329-1122
PO BOX 1123, CLINTON, NC 28329-1123
PO BOX 1124, CLINTON, NC 28329-1124
PO BOX 1125, CLINTON, NC 28329-1125
PO BOX 1126, CLINTON, NC 28329-1126
PO BOX 1127, CLINTON, NC 28329-1127
PO BOX 1128, CLINTON, NC 28329-1128
PO BOX 1129, CLINTON, NC 28329-1129
PO BOX 1130, CLINTON, NC 28329-1130
PO BOX 1131, CLINTON, NC 28329-1131
PO BOX 1132, CLINTON, NC 28329-1132
PO BOX 1133, CLINTON, NC 28329-1133
PO BOX 1134, CLINTON, NC 28329-1134
PO BOX 1135, CLINTON, NC 28329-1135
PO BOX 1136, CLINTON, NC 28329-1136
PO BOX 1137, CLINTON, NC 28329-1137
PO BOX 1138, CLINTON, NC 28329-1138
PO BOX 1139, CLINTON, NC 28329-1139
PO BOX 1140, CLINTON, NC 28329-1140
PO BOX 1141, CLINTON, NC 28329-1141
PO BOX 1142, CLINTON, NC 28329-1142
PO BOX 1143, CLINTON, NC 28329-1143
PO BOX 1144, CLINTON, NC 28329-1144
PO BOX 1145, CLINTON, NC 28329-1145
PO BOX 1146, CLINTON, NC 28329-1146
PO BOX 1147, CLINTON, NC 28329-1147
PO BOX 1148, CLINTON, NC 28329-1148
PO BOX 1149, CLINTON, NC 28329-1149
PO BOX 1150, CLINTON, NC 28329-1150
PO BOX 1151, CLINTON, NC 28329-1151
PO BOX 1152, CLINTON, NC 28329-1152
PO BOX 1153, CLINTON, NC 28329-1153
PO BOX 1154, CLINTON, NC 28329-1154
PO BOX 1155, CLINTON, NC 28329-1155
PO BOX 1156, CLINTON, NC 28329-1156
PO BOX 1157, CLINTON, NC 28329-1157
PO BOX 1158, CLINTON, NC 28329-1158
PO BOX 1159, CLINTON, NC 28329-1159
PO BOX 1160, CLINTON, NC 28329-1160
PO BOX 1161, CLINTON, NC 28329-1161
PO BOX 1162, CLINTON, NC 28329-1162
PO BOX 1163, CLINTON, NC 28329-1163
PO BOX 1164, CLINTON, NC 28329-1164
PO BOX 1165, CLINTON, NC 28329-1165
PO BOX 1166, CLINTON, NC 28329-1166
PO BOX 1167, CLINTON, NC 28329-1167
PO BOX 1168, CLINTON, NC 28329-1168
PO BOX 1169, CLINTON, NC 28329-1169
PO BOX 1170, CLINTON, NC 28329-1170
PO BOX 1171, CLINTON, NC 28329-1171
PO BOX 1172, CLINTON, NC 28329-1172
PO BOX 1173, CLINTON, NC 28329-1173
PO BOX 1174, CLINTON, NC 28329-1174
PO BOX 1175, CLINTON, NC 28329-1175
PO BOX 1176, CLINTON, NC 28329-1176
PO BOX 1177, CLINTON, NC 28329-1177
PO BOX 1178, CLINTON, NC 28329-1178
PO BOX 1179, CLINTON, NC 28329-1179
PO BOX 1180, CLINTON, NC 28329-1180
PO BOX 1181, CLINTON, NC 28329-1181
PO BOX 1182, CLINTON, NC 28329-1182
PO BOX 1183, CLINTON, NC 28329-1183
PO BOX 1184, CLINTON, NC 28329-1184
PO BOX 1185, CLINTON, NC 28329-1185
PO BOX 1186, CLINTON, NC 28329-1186
PO BOX 1187, CLINTON, NC 28329-1187
PO BOX 1188, CLINTON, NC 28329-1188
PO BOX 1189, CLINTON, NC 28329-1189
PO BOX 1190, CLINTON, NC 28329-1190
PO BOX 1191, CLINTON, NC 28329-1191
PO BOX 1192, CLINTON, NC 28329-1192
PO BOX 1193, CLINTON, NC 28329-1193
PO BOX 1194, CLINTON, NC 28329-1194
PO BOX 1195, CLINTON, NC 28329-1195
PO BOX 1196, CLINTON, NC 28329-1196
PO BOX 1197, CLINTON, NC 28329-1197
PO BOX 1198, CLINTON, NC 28329-1198
PO BOX 1199, CLINTON, NC 28329-1199
PO BOX 1200, CLINTON, NC 28329-1200
PO BOX 1201, CLINTON, NC 28329-1201
PO BOX 1202, CLINTON, NC 28329-1202
PO BOX 1203, CLINTON, NC 28329-1203
PO BOX 1204, CLINTON, NC 28329-1204
PO BOX 1205, CLINTON, NC 28329-1205
PO BOX 1206, CLINTON, NC 28329-1206
PO BOX 1207, CLINTON, NC 28329-1207
PO BOX 1208, CLINTON, NC 28329-1208
PO BOX 1209, CLINTON, NC 28329-1209
PO BOX 1210, CLINTON, NC 28329-1210
PO BOX 1211, CLINTON, NC 28329-1211
PO BOX 1212, CLINTON, NC 28329-1212
PO BOX 1213, CLINTON, NC 28329-1213
PO BOX 1214, CLINTON, NC 28329-1214
PO BOX 1215, CLINTON, NC 28329-1215
PO BOX 1216, CLINTON, NC 28329-1216
PO BOX 1217, CLINTON, NC 28329-1217
PO BOX 1218, CLINTON, NC 28329-1218
PO BOX 1219, CLINTON, NC 28329-1219
PO BOX 1220, CLINTON, NC 28329-1220
PO BOX 1221, CLINTON, NC 28329-1221
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