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 991, WILMINGTON, NC 28402-0991
PO BOX 992, WILMINGTON, NC 28402-0992
PO BOX 993, WILMINGTON, NC 28402-0993
PO BOX 994, WILMINGTON, NC 28402-0994
PO BOX 995, WILMINGTON, NC 28402-0995
PO BOX 996, WILMINGTON, NC 28402-0996
PO BOX 997, WILMINGTON, NC 28402-0997
PO BOX 998, WILMINGTON, NC 28402-0998
PO BOX 999, WILMINGTON, NC 28402-0999
PO BOX 1000, WILMINGTON, NC 28402-1000
PO BOX 1001, WILMINGTON, NC 28402-1001
PO BOX 1002, WILMINGTON, NC 28402-1002
PO BOX 1003, WILMINGTON, NC 28402-1003
PO BOX 1004, WILMINGTON, NC 28402-1004
PO BOX 1005, WILMINGTON, NC 28402-1005
PO BOX 1006, WILMINGTON, NC 28402-1006
PO BOX 1007, WILMINGTON, NC 28402-1007
PO BOX 1008, WILMINGTON, NC 28402-1008
PO BOX 1009, WILMINGTON, NC 28402-1009
PO BOX 1010, WILMINGTON, NC 28402-1010
PO BOX 1011, WILMINGTON, NC 28402-1011
PO BOX 1012, WILMINGTON, NC 28402-1012
PO BOX 1013, WILMINGTON, NC 28402-1013
PO BOX 1014, WILMINGTON, NC 28402-1014
PO BOX 1015, WILMINGTON, NC 28402-1015
PO BOX 1016, WILMINGTON, NC 28402-1016
PO BOX 1017, WILMINGTON, NC 28402-1017
PO BOX 1018, WILMINGTON, NC 28402-1018
PO BOX 1019, WILMINGTON, NC 28402-1019
PO BOX 1020, WILMINGTON, NC 28402-1020
PO BOX 1021, WILMINGTON, NC 28402-1021
PO BOX 1022, WILMINGTON, NC 28402-1022
PO BOX 1023, WILMINGTON, NC 28402-1023
PO BOX 1024, WILMINGTON, NC 28402-1024
PO BOX 1025, WILMINGTON, NC 28402-1025
PO BOX 1026, WILMINGTON, NC 28402-1026
PO BOX 1027, WILMINGTON, NC 28402-1027
PO BOX 1028, WILMINGTON, NC 28402-1028
PO BOX 1029, WILMINGTON, NC 28402-1029
PO BOX 1030, WILMINGTON, NC 28402-1030
PO BOX 1031, WILMINGTON, NC 28402-1031
PO BOX 1032, WILMINGTON, NC 28402-1032
PO BOX 1033, WILMINGTON, NC 28402-1033
PO BOX 1034, WILMINGTON, NC 28402-1034
PO BOX 1035, WILMINGTON, NC 28402-1035
PO BOX 1036, WILMINGTON, NC 28402-1036
PO BOX 1037, WILMINGTON, NC 28402-1037
PO BOX 1038, WILMINGTON, NC 28402-1038
PO BOX 1039, WILMINGTON, NC 28402-1039
PO BOX 1040, WILMINGTON, NC 28402-1040
PO BOX 1041, WILMINGTON, NC 28402-1041
PO BOX 1042, WILMINGTON, NC 28402-1042
PO BOX 1043, WILMINGTON, NC 28402-1043
PO BOX 1044, WILMINGTON, NC 28402-1044
PO BOX 1045, WILMINGTON, NC 28402-1045
PO BOX 1046, WILMINGTON, NC 28402-1046
PO BOX 1047, WILMINGTON, NC 28402-1047
PO BOX 1048, WILMINGTON, NC 28402-1048
PO BOX 1049, WILMINGTON, NC 28402-1049
PO BOX 1050, WILMINGTON, NC 28402-1050
PO BOX 1051, WILMINGTON, NC 28402-1051
PO BOX 1052, WILMINGTON, NC 28402-1052
PO BOX 1053, WILMINGTON, NC 28402-1053
PO BOX 1054, WILMINGTON, NC 28402-1054
PO BOX 1055, WILMINGTON, NC 28402-1055
PO BOX 1056, WILMINGTON, NC 28402-1056
PO BOX 1057, WILMINGTON, NC 28402-1057
PO BOX 1058, WILMINGTON, NC 28402-1058
PO BOX 1059, WILMINGTON, NC 28402-1059
PO BOX 1060, WILMINGTON, NC 28402-1060
PO BOX 1061, WILMINGTON, NC 28402-1061
PO BOX 1062, WILMINGTON, NC 28402-1062
PO BOX 1063, WILMINGTON, NC 28402-1063
PO BOX 1064, WILMINGTON, NC 28402-1064
PO BOX 1065, WILMINGTON, NC 28402-1065
PO BOX 1066, WILMINGTON, NC 28402-1066
PO BOX 1067, WILMINGTON, NC 28402-1067
PO BOX 1068, WILMINGTON, NC 28402-1068
PO BOX 1069, WILMINGTON, NC 28402-1069
PO BOX 1070, WILMINGTON, NC 28402-1070
PO BOX 1071, WILMINGTON, NC 28402-1071
PO BOX 1072, WILMINGTON, NC 28402-1072
PO BOX 1073, WILMINGTON, NC 28402-1073
PO BOX 1074, WILMINGTON, NC 28402-1074
PO BOX 1075, WILMINGTON, NC 28402-1075
PO BOX 1076, WILMINGTON, NC 28402-1076
PO BOX 1077, WILMINGTON, NC 28402-1077
PO BOX 1078, WILMINGTON, NC 28402-1078
PO BOX 1079, WILMINGTON, NC 28402-1079
PO BOX 1080, WILMINGTON, NC 28402-1080
PO BOX 1081, WILMINGTON, NC 28402-1081
PO BOX 1082, WILMINGTON, NC 28402-1082
PO BOX 1083, WILMINGTON, NC 28402-1083
PO BOX 1084, WILMINGTON, NC 28402-1084
PO BOX 1085, WILMINGTON, NC 28402-1085
PO BOX 1086, WILMINGTON, NC 28402-1086
PO BOX 1087, WILMINGTON, NC 28402-1087
PO BOX 1088, WILMINGTON, NC 28402-1088
PO BOX 1089, WILMINGTON, NC 28402-1089
PO BOX 1090, WILMINGTON, NC 28402-1090
PO BOX 1091, WILMINGTON, NC 28402-1091
PO BOX 1092, WILMINGTON, NC 28402-1092
PO BOX 1093, WILMINGTON, NC 28402-1093
PO BOX 1094, WILMINGTON, NC 28402-1094
PO BOX 1095, WILMINGTON, NC 28402-1095
PO BOX 1096, WILMINGTON, NC 28402-1096
PO BOX 1097, WILMINGTON, NC 28402-1097
PO BOX 1098, WILMINGTON, NC 28402-1098
PO BOX 1099, WILMINGTON, NC 28402-1099
PO BOX 1100, WILMINGTON, NC 28402-1100
PO BOX 1101, WILMINGTON, NC 28402-1101
PO BOX 1102, WILMINGTON, NC 28402-1102
PO BOX 1103, WILMINGTON, NC 28402-1103
PO BOX 1104, WILMINGTON, NC 28402-1104
PO BOX 1105, WILMINGTON, NC 28402-1105
PO BOX 1106, WILMINGTON, NC 28402-1106
PO BOX 1107, WILMINGTON, NC 28402-1107
PO BOX 1108, WILMINGTON, NC 28402-1108
PO BOX 1109, WILMINGTON, NC 28402-1109
PO BOX 1110, WILMINGTON, NC 28402-1110
PO BOX 1111, WILMINGTON, NC 28402-1111
PO BOX 1112, WILMINGTON, NC 28402-1112
PO BOX 1113, WILMINGTON, NC 28402-1113
PO BOX 1114, WILMINGTON, NC 28402-1114
PO BOX 1115, WILMINGTON, NC 28402-1115
PO BOX 1116, WILMINGTON, NC 28402-1116
PO BOX 1117, WILMINGTON, NC 28402-1117
PO BOX 1118, WILMINGTON, NC 28402-1118
PO BOX 1119, WILMINGTON, NC 28402-1119
PO BOX 1120, WILMINGTON, NC 28402-1120
PO BOX 1121, WILMINGTON, NC 28402-1121
PO BOX 1122, WILMINGTON, NC 28402-1122
PO BOX 1123, WILMINGTON, NC 28402-1123
PO BOX 1124, WILMINGTON, NC 28402-1124
PO BOX 1125, WILMINGTON, NC 28402-1125
PO BOX 1126, WILMINGTON, NC 28402-1126
PO BOX 1127, WILMINGTON, NC 28402-1127
PO BOX 1128, WILMINGTON, NC 28402-1128
PO BOX 1129, WILMINGTON, NC 28402-1129
PO BOX 1130, WILMINGTON, NC 28402-1130
PO BOX 1131, WILMINGTON, NC 28402-1131
PO BOX 1132, WILMINGTON, NC 28402-1132
PO BOX 1133, WILMINGTON, NC 28402-1133
PO BOX 1134, WILMINGTON, NC 28402-1134
PO BOX 1135, WILMINGTON, NC 28402-1135
PO BOX 1136, WILMINGTON, NC 28402-1136
PO BOX 1137, WILMINGTON, NC 28402-1137
PO BOX 1138, WILMINGTON, NC 28402-1138
PO BOX 1139, WILMINGTON, NC 28402-1139
PO BOX 1140, WILMINGTON, NC 28402-1140
PO BOX 1141, WILMINGTON, NC 28402-1141
PO BOX 1142, WILMINGTON, NC 28402-1142
PO BOX 1143, WILMINGTON, NC 28402-1143
PO BOX 1144, WILMINGTON, NC 28402-1144
PO BOX 1145, WILMINGTON, NC 28402-1145
PO BOX 1146, WILMINGTON, NC 28402-1146
PO BOX 1147, WILMINGTON, NC 28402-1147
PO BOX 1148, WILMINGTON, NC 28402-1148
PO BOX 1149, WILMINGTON, NC 28402-1149
PO BOX 1150, WILMINGTON, NC 28402-1150
PO BOX 1151, WILMINGTON, NC 28402-1151
PO BOX 1152, WILMINGTON, NC 28402-1152
PO BOX 1153, WILMINGTON, NC 28402-1153
PO BOX 1154, WILMINGTON, NC 28402-1154
PO BOX 1155, WILMINGTON, NC 28402-1155
PO BOX 1156, WILMINGTON, NC 28402-1156
PO BOX 1157, WILMINGTON, NC 28402-1157
PO BOX 1158, WILMINGTON, NC 28402-1158
PO BOX 1159, WILMINGTON, NC 28402-1159
PO BOX 1160, WILMINGTON, NC 28402-1160
PO BOX 1161, WILMINGTON, NC 28402-1161
PO BOX 1162, WILMINGTON, NC 28402-1162
PO BOX 1163, WILMINGTON, NC 28402-1163
PO BOX 1164, WILMINGTON, NC 28402-1164
PO BOX 1165, WILMINGTON, NC 28402-1165
PO BOX 1166, WILMINGTON, NC 28402-1166
PO BOX 1167, WILMINGTON, NC 28402-1167
PO BOX 1168, WILMINGTON, NC 28402-1168
PO BOX 1169, WILMINGTON, NC 28402-1169
PO BOX 1170, WILMINGTON, NC 28402-1170
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