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 1041, SALISBURY, MD 21802-1041
PO BOX 1042, SALISBURY, MD 21802-1042
PO BOX 1043, SALISBURY, MD 21802-1043
PO BOX 1044, SALISBURY, MD 21802-1044
PO BOX 1045, SALISBURY, MD 21802-1045
PO BOX 1046, SALISBURY, MD 21802-1046
PO BOX 1047, SALISBURY, MD 21802-1047
PO BOX 1048, SALISBURY, MD 21802-1048
PO BOX 1049, SALISBURY, MD 21802-1049
PO BOX 1050, SALISBURY, MD 21802-1050
PO BOX 1051, SALISBURY, MD 21802-1051
PO BOX 1052, SALISBURY, MD 21802-1052
PO BOX 1053, SALISBURY, MD 21802-1053
PO BOX 1054, SALISBURY, MD 21802-1054
PO BOX 1055, SALISBURY, MD 21802-1055
PO BOX 1056, SALISBURY, MD 21802-1056
PO BOX 1057, SALISBURY, MD 21802-1057
PO BOX 1058, SALISBURY, MD 21802-1058
PO BOX 1059, SALISBURY, MD 21802-1059
PO BOX 1060, SALISBURY, MD 21802-1060
PO BOX 1061, SALISBURY, MD 21802-1061
PO BOX 1062, SALISBURY, MD 21802-1062
PO BOX 1063, SALISBURY, MD 21802-1063
PO BOX 1064, SALISBURY, MD 21802-1064
PO BOX 1065, SALISBURY, MD 21802-1065
PO BOX 1066, SALISBURY, MD 21802-1066
PO BOX 1067, SALISBURY, MD 21802-1067
PO BOX 1068, SALISBURY, MD 21802-1068
PO BOX 1069, SALISBURY, MD 21802-1069
PO BOX 1070, SALISBURY, MD 21802-1070
PO BOX 1071, SALISBURY, MD 21802-1071
PO BOX 1072, SALISBURY, MD 21802-1072
PO BOX 1073, SALISBURY, MD 21802-1073
PO BOX 1074, SALISBURY, MD 21802-1074
PO BOX 1075, SALISBURY, MD 21802-1075
PO BOX 1076, SALISBURY, MD 21802-1076
PO BOX 1077, SALISBURY, MD 21802-1077
PO BOX 1078, SALISBURY, MD 21802-1078
PO BOX 1079, SALISBURY, MD 21802-1079
PO BOX 1080, SALISBURY, MD 21802-1080
PO BOX 1081, SALISBURY, MD 21802-1081
PO BOX 1082, SALISBURY, MD 21802-1082
PO BOX 1083, SALISBURY, MD 21802-1083
PO BOX 1084, SALISBURY, MD 21802-1084
PO BOX 1085, SALISBURY, MD 21802-1085
PO BOX 1086, SALISBURY, MD 21802-1086
PO BOX 1087, SALISBURY, MD 21802-1087
PO BOX 1088, SALISBURY, MD 21802-1088
PO BOX 1089, SALISBURY, MD 21802-1089
PO BOX 1090, SALISBURY, MD 21802-1090
PO BOX 1091, SALISBURY, MD 21802-1091
PO BOX 1092, SALISBURY, MD 21802-1092
PO BOX 1093, SALISBURY, MD 21802-1093
PO BOX 1094, SALISBURY, MD 21802-1094
PO BOX 1095, SALISBURY, MD 21802-1095
PO BOX 1096, SALISBURY, MD 21802-1096
PO BOX 1097, SALISBURY, MD 21802-1097
PO BOX 1098, SALISBURY, MD 21802-1098
PO BOX 1099, SALISBURY, MD 21802-1099
PO BOX 1100, SALISBURY, MD 21802-1100
PO BOX 1101, SALISBURY, MD 21802-1101
PO BOX 1102, SALISBURY, MD 21802-1102
PO BOX 1103, SALISBURY, MD 21802-1103
PO BOX 1104, SALISBURY, MD 21802-1104
PO BOX 1105, SALISBURY, MD 21802-1105
PO BOX 1106, SALISBURY, MD 21802-1106
PO BOX 1107, SALISBURY, MD 21802-1107
PO BOX 1108, SALISBURY, MD 21802-1108
PO BOX 1109, SALISBURY, MD 21802-1109
PO BOX 1110, SALISBURY, MD 21802-1110
PO BOX 1111, SALISBURY, MD 21802-1111
PO BOX 1112, SALISBURY, MD 21802-1112
PO BOX 1113, SALISBURY, MD 21802-1113
PO BOX 1114, SALISBURY, MD 21802-1114
PO BOX 1115, SALISBURY, MD 21802-1115
PO BOX 1116, SALISBURY, MD 21802-1116
PO BOX 1117, SALISBURY, MD 21802-1117
PO BOX 1118, SALISBURY, MD 21802-1118
PO BOX 1119, SALISBURY, MD 21802-1119
PO BOX 1120, SALISBURY, MD 21802-1120
PO BOX 1121, SALISBURY, MD 21802-1121
PO BOX 1122, SALISBURY, MD 21802-1122
PO BOX 1123, SALISBURY, MD 21802-1123
PO BOX 1124, SALISBURY, MD 21802-1124
PO BOX 1125, SALISBURY, MD 21802-1125
PO BOX 1126, SALISBURY, MD 21802-1126
PO BOX 1127, SALISBURY, MD 21802-1127
PO BOX 1128, SALISBURY, MD 21802-1128
PO BOX 1129, SALISBURY, MD 21802-1129
PO BOX 1130, SALISBURY, MD 21802-1130
PO BOX 1131, SALISBURY, MD 21802-1131
PO BOX 1132, SALISBURY, MD 21802-1132
PO BOX 1133, SALISBURY, MD 21802-1133
PO BOX 1134, SALISBURY, MD 21802-1134
PO BOX 1135, SALISBURY, MD 21802-1135
PO BOX 1136, SALISBURY, MD 21802-1136
PO BOX 1137, SALISBURY, MD 21802-1137
PO BOX 1138, SALISBURY, MD 21802-1138
PO BOX 1139, SALISBURY, MD 21802-1139
PO BOX 1140, SALISBURY, MD 21802-1140
PO BOX 1141, SALISBURY, MD 21802-1141
PO BOX 1142, SALISBURY, MD 21802-1142
PO BOX 1143, SALISBURY, MD 21802-1143
PO BOX 1144, SALISBURY, MD 21802-1144
PO BOX 1145, SALISBURY, MD 21802-1145
PO BOX 1146, SALISBURY, MD 21802-1146
PO BOX 1147, SALISBURY, MD 21802-1147
PO BOX 1148, SALISBURY, MD 21802-1148
PO BOX 1149, SALISBURY, MD 21802-1149
PO BOX 1150, SALISBURY, MD 21802-1150
PO BOX 1151, SALISBURY, MD 21802-1151
PO BOX 1152, SALISBURY, MD 21802-1152
PO BOX 1153, SALISBURY, MD 21802-1153
PO BOX 1154, SALISBURY, MD 21802-1154
PO BOX 1155, SALISBURY, MD 21802-1155
PO BOX 1156, SALISBURY, MD 21802-1156
PO BOX 1157, SALISBURY, MD 21802-1157
PO BOX 1158, SALISBURY, MD 21802-1158
PO BOX 1159, SALISBURY, MD 21802-1159
PO BOX 1160, SALISBURY, MD 21802-1160
PO BOX 1161, SALISBURY, MD 21802-1161
PO BOX 1162, SALISBURY, MD 21802-1162
PO BOX 1163, SALISBURY, MD 21802-1163
PO BOX 1164, SALISBURY, MD 21802-1164
PO BOX 1165, SALISBURY, MD 21802-1165
PO BOX 1166, SALISBURY, MD 21802-1166
PO BOX 1167, SALISBURY, MD 21802-1167
PO BOX 1168, SALISBURY, MD 21802-1168
PO BOX 1169, SALISBURY, MD 21802-1169
PO BOX 1170, SALISBURY, MD 21802-1170
PO BOX 1171, SALISBURY, MD 21802-1171
PO BOX 1172, SALISBURY, MD 21802-1172
PO BOX 1173, SALISBURY, MD 21802-1173
PO BOX 1174, SALISBURY, MD 21802-1174
PO BOX 1175, SALISBURY, MD 21802-1175
PO BOX 1176, SALISBURY, MD 21802-1176
PO BOX 1177, SALISBURY, MD 21802-1177
PO BOX 1178, SALISBURY, MD 21802-1178
PO BOX 1179, SALISBURY, MD 21802-1179
PO BOX 1180, SALISBURY, MD 21802-1180
PO BOX 1181, SALISBURY, MD 21802-1181
PO BOX 1182, SALISBURY, MD 21802-1182
PO BOX 1183, SALISBURY, MD 21802-1183
PO BOX 1184, SALISBURY, MD 21802-1184
PO BOX 1185, SALISBURY, MD 21802-1185
PO BOX 1186, SALISBURY, MD 21802-1186
PO BOX 1187, SALISBURY, MD 21802-1187
PO BOX 1188, SALISBURY, MD 21802-1188
PO BOX 1189, SALISBURY, MD 21802-1189
PO BOX 1190, SALISBURY, MD 21802-1190
PO BOX 1191, SALISBURY, MD 21802-1191
PO BOX 1192, SALISBURY, MD 21802-1192
PO BOX 1193, SALISBURY, MD 21802-1193
PO BOX 1194, SALISBURY, MD 21802-1194
PO BOX 1195, SALISBURY, MD 21802-1195
PO BOX 1196, SALISBURY, MD 21802-1196
PO BOX 1197, SALISBURY, MD 21802-1197
PO BOX 1198, SALISBURY, MD 21802-1198
PO BOX 1199, SALISBURY, MD 21802-1199
PO BOX 1200, SALISBURY, MD 21802-1200
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