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 27021, SAN DIEGO, CA 92198-1021
PO BOX 27022, SAN DIEGO, CA 92198-1022
PO BOX 27023, SAN DIEGO, CA 92198-1023
PO BOX 27024, SAN DIEGO, CA 92198-1024
PO BOX 27025, SAN DIEGO, CA 92198-1025
PO BOX 27026, SAN DIEGO, CA 92198-1026
PO BOX 27027, SAN DIEGO, CA 92198-1027
PO BOX 27028, SAN DIEGO, CA 92198-1028
PO BOX 27029, SAN DIEGO, CA 92198-1029
PO BOX 27030, SAN DIEGO, CA 92198-1030
PO BOX 27031, SAN DIEGO, CA 92198-1031
PO BOX 27032, SAN DIEGO, CA 92198-1032
PO BOX 27033, SAN DIEGO, CA 92198-1033
PO BOX 27034, SAN DIEGO, CA 92198-1034
PO BOX 27035, SAN DIEGO, CA 92198-1035
PO BOX 27036, SAN DIEGO, CA 92198-1036
PO BOX 27037, SAN DIEGO, CA 92198-1037
PO BOX 27038, SAN DIEGO, CA 92198-1038
PO BOX 27039, SAN DIEGO, CA 92198-1039
PO BOX 27040, SAN DIEGO, CA 92198-1040
PO BOX 27041, SAN DIEGO, CA 92198-1041
PO BOX 27042, SAN DIEGO, CA 92198-1042
PO BOX 27043, SAN DIEGO, CA 92198-1043
PO BOX 27044, SAN DIEGO, CA 92198-1044
PO BOX 27045, SAN DIEGO, CA 92198-1045
PO BOX 27046, SAN DIEGO, CA 92198-1046
PO BOX 27047, SAN DIEGO, CA 92198-1047
PO BOX 27048, SAN DIEGO, CA 92198-1048
PO BOX 27049, SAN DIEGO, CA 92198-1049
PO BOX 27050, SAN DIEGO, CA 92198-1050
PO BOX 27051, SAN DIEGO, CA 92198-1051
PO BOX 27052, SAN DIEGO, CA 92198-1052
PO BOX 27053, SAN DIEGO, CA 92198-1053
PO BOX 27054, SAN DIEGO, CA 92198-1054
PO BOX 27055, SAN DIEGO, CA 92198-1055
PO BOX 27056, SAN DIEGO, CA 92198-1056
PO BOX 27057, SAN DIEGO, CA 92198-1057
PO BOX 27058, SAN DIEGO, CA 92198-1058
PO BOX 27059, SAN DIEGO, CA 92198-1059
PO BOX 27060, SAN DIEGO, CA 92198-1060
PO BOX 27061, SAN DIEGO, CA 92198-1061
PO BOX 27062, SAN DIEGO, CA 92198-1062
PO BOX 27063, SAN DIEGO, CA 92198-1063
PO BOX 27064, SAN DIEGO, CA 92198-1064
PO BOX 27065, SAN DIEGO, CA 92198-1065
PO BOX 27066, SAN DIEGO, CA 92198-1066
PO BOX 27067, SAN DIEGO, CA 92198-1067
PO BOX 27068, SAN DIEGO, CA 92198-1068
PO BOX 27069, SAN DIEGO, CA 92198-1069
PO BOX 27070, SAN DIEGO, CA 92198-1070
PO BOX 27071, SAN DIEGO, CA 92198-1071
PO BOX 27072, SAN DIEGO, CA 92198-1072
PO BOX 27073, SAN DIEGO, CA 92198-1073
PO BOX 27074, SAN DIEGO, CA 92198-1074
PO BOX 27075, SAN DIEGO, CA 92198-1075
PO BOX 27076, SAN DIEGO, CA 92198-1076
PO BOX 27077, SAN DIEGO, CA 92198-1077
PO BOX 27078, SAN DIEGO, CA 92198-1078
PO BOX 27079, SAN DIEGO, CA 92198-1079
PO BOX 27080, SAN DIEGO, CA 92198-1080
PO BOX 27081, SAN DIEGO, CA 92198-1081
PO BOX 27082, SAN DIEGO, CA 92198-1082
PO BOX 27083, SAN DIEGO, CA 92198-1083
PO BOX 27084, SAN DIEGO, CA 92198-1084
PO BOX 27085, SAN DIEGO, CA 92198-1085
PO BOX 27086, SAN DIEGO, CA 92198-1086
PO BOX 27087, SAN DIEGO, CA 92198-1087
PO BOX 27088, SAN DIEGO, CA 92198-1088
PO BOX 27089, SAN DIEGO, CA 92198-1089
PO BOX 27090, SAN DIEGO, CA 92198-1090
PO BOX 27091, SAN DIEGO, CA 92198-1091
PO BOX 27092, SAN DIEGO, CA 92198-1092
PO BOX 27093, SAN DIEGO, CA 92198-1093
PO BOX 27094, SAN DIEGO, CA 92198-1094
PO BOX 27095, SAN DIEGO, CA 92198-1095
PO BOX 27096, SAN DIEGO, CA 92198-1096
PO BOX 27097, SAN DIEGO, CA 92198-1097
PO BOX 27098, SAN DIEGO, CA 92198-1098
PO BOX 27099, SAN DIEGO, CA 92198-1099
PO BOX 27100, SAN DIEGO, CA 92198-1100
PO BOX 27101, SAN DIEGO, CA 92198-1101
PO BOX 27102, SAN DIEGO, CA 92198-1102
PO BOX 27103, SAN DIEGO, CA 92198-1103
PO BOX 27104, SAN DIEGO, CA 92198-1104
PO BOX 27105, SAN DIEGO, CA 92198-1105
PO BOX 27106, SAN DIEGO, CA 92198-1106
PO BOX 27107, SAN DIEGO, CA 92198-1107
PO BOX 27108, SAN DIEGO, CA 92198-1108
PO BOX 27109, SAN DIEGO, CA 92198-1109
PO BOX 27110, SAN DIEGO, CA 92198-1110
PO BOX 27111, SAN DIEGO, CA 92198-1111
PO BOX 27112, SAN DIEGO, CA 92198-1112
PO BOX 27113, SAN DIEGO, CA 92198-1113
PO BOX 27114, SAN DIEGO, CA 92198-1114
PO BOX 27115, SAN DIEGO, CA 92198-1115
PO BOX 27116, SAN DIEGO, CA 92198-1116
PO BOX 27117, SAN DIEGO, CA 92198-1117
PO BOX 27118, SAN DIEGO, CA 92198-1118
PO BOX 27119, SAN DIEGO, CA 92198-1119
PO BOX 27120, SAN DIEGO, CA 92198-1120
PO BOX 27121, SAN DIEGO, CA 92198-1121
PO BOX 27122, SAN DIEGO, CA 92198-1122
PO BOX 27123, SAN DIEGO, CA 92198-1123
PO BOX 27124, SAN DIEGO, CA 92198-1124
PO BOX 27125, SAN DIEGO, CA 92198-1125
PO BOX 27126, SAN DIEGO, CA 92198-1126
PO BOX 27127, SAN DIEGO, CA 92198-1127
PO BOX 27128, SAN DIEGO, CA 92198-1128
PO BOX 27129, SAN DIEGO, CA 92198-1129
PO BOX 27130, SAN DIEGO, CA 92198-1130
PO BOX 27131, SAN DIEGO, CA 92198-1131
PO BOX 27132, SAN DIEGO, CA 92198-1132
PO BOX 27133, SAN DIEGO, CA 92198-1133
PO BOX 27134, SAN DIEGO, CA 92198-1134
PO BOX 27135, SAN DIEGO, CA 92198-1135
PO BOX 27136, SAN DIEGO, CA 92198-1136
PO BOX 27137, SAN DIEGO, CA 92198-1137
PO BOX 27138, SAN DIEGO, CA 92198-1138
PO BOX 27139, SAN DIEGO, CA 92198-1139
PO BOX 27140, SAN DIEGO, CA 92198-1140
PO BOX 27141, SAN DIEGO, CA 92198-1141
PO BOX 27142, SAN DIEGO, CA 92198-1142
PO BOX 27143, SAN DIEGO, CA 92198-1143
PO BOX 27144, SAN DIEGO, CA 92198-1144
PO BOX 27145, SAN DIEGO, CA 92198-1145
PO BOX 27146, SAN DIEGO, CA 92198-1146
PO BOX 27147, SAN DIEGO, CA 92198-1147
PO BOX 27148, SAN DIEGO, CA 92198-1148
PO BOX 27149, SAN DIEGO, CA 92198-1149
PO BOX 27150, SAN DIEGO, CA 92198-1150
PO BOX 27151, SAN DIEGO, CA 92198-1151
PO BOX 27152, SAN DIEGO, CA 92198-1152
PO BOX 27153, SAN DIEGO, CA 92198-1153
PO BOX 27154, SAN DIEGO, CA 92198-1154
PO BOX 27155, SAN DIEGO, CA 92198-1155
PO BOX 27156, SAN DIEGO, CA 92198-1156
PO BOX 27157, SAN DIEGO, CA 92198-1157
PO BOX 27158, SAN DIEGO, CA 92198-1158
PO BOX 27159, SAN DIEGO, CA 92198-1159
PO BOX 27160, SAN DIEGO, CA 92198-1160
PO BOX 27161, SAN DIEGO, CA 92198-1161
PO BOX 27162, SAN DIEGO, CA 92198-1162
PO BOX 27163, SAN DIEGO, CA 92198-1163
PO BOX 27164, SAN DIEGO, CA 92198-1164
PO BOX 27165, SAN DIEGO, CA 92198-1165
PO BOX 27166, SAN DIEGO, CA 92198-1166
PO BOX 27167, SAN DIEGO, CA 92198-1167
PO BOX 27168, SAN DIEGO, CA 92198-1168
PO BOX 27169, SAN DIEGO, CA 92198-1169
PO BOX 27170, SAN DIEGO, CA 92198-1170
PO BOX 27171, SAN DIEGO, CA 92198-1171
PO BOX 27172, SAN DIEGO, CA 92198-1172
PO BOX 27173, SAN DIEGO, CA 92198-1173
PO BOX 27174, SAN DIEGO, CA 92198-1174
PO BOX 27175, SAN DIEGO, CA 92198-1175
PO BOX 27176, SAN DIEGO, CA 92198-1176
PO BOX 27177, SAN DIEGO, CA 92198-1177
PO BOX 27178, SAN DIEGO, CA 92198-1178
PO BOX 27179, SAN DIEGO, CA 92198-1179
PO BOX 27180, SAN DIEGO, CA 92198-1180
PO BOX 27181, SAN DIEGO, CA 92198-1181
PO BOX 27182, SAN DIEGO, CA 92198-1182
PO BOX 27183, SAN DIEGO, CA 92198-1183
PO BOX 27184, SAN DIEGO, CA 92198-1184
PO BOX 27185, SAN DIEGO, CA 92198-1185
PO BOX 27186, SAN DIEGO, CA 92198-1186
PO BOX 27187, SAN DIEGO, CA 92198-1187
PO BOX 27188, SAN DIEGO, CA 92198-1188
PO BOX 27189, SAN DIEGO, CA 92198-1189
PO BOX 27190, SAN DIEGO, CA 92198-1190
PO BOX 27191, SAN DIEGO, CA 92198-1191
PO BOX 27192, SAN DIEGO, CA 92198-1192
PO BOX 27193, SAN DIEGO, CA 92198-1193
PO BOX 27194, SAN DIEGO, CA 92198-1194
PO BOX 27195, SAN DIEGO, CA 92198-1195
PO BOX 27196, SAN DIEGO, CA 92198-1196
PO BOX 27197, SAN DIEGO, CA 92198-1197
PO BOX 27198, SAN DIEGO, CA 92198-1198
PO BOX 27199, SAN DIEGO, CA 92198-1199
PO BOX 27200, SAN DIEGO, CA 92198-1200
PO BOX 27201, SAN DIEGO, CA 92198-1201
PO BOX 27202, SAN DIEGO, CA 92198-1202
PO BOX 27203, SAN DIEGO, CA 92198-1203
PO BOX 27204, SAN DIEGO, CA 92198-1204
PO BOX 27205, SAN DIEGO, CA 92198-1205
PO BOX 27206, SAN DIEGO, CA 92198-1206
PO BOX 27207, SAN DIEGO, CA 92198-1207
PO BOX 27208, SAN DIEGO, CA 92198-1208
PO BOX 27209, SAN DIEGO, CA 92198-1209
PO BOX 27210, SAN DIEGO, CA 92198-1210
PO BOX 27211, SAN DIEGO, CA 92198-1211
PO BOX 27212, SAN DIEGO, CA 92198-1212
PO BOX 27213, SAN DIEGO, CA 92198-1213
PO BOX 27214, SAN DIEGO, CA 92198-1214
PO BOX 27215, SAN DIEGO, CA 92198-1215
PO BOX 27216, SAN DIEGO, CA 92198-1216
PO BOX 27217, SAN DIEGO, CA 92198-1217
PO BOX 27218, SAN DIEGO, CA 92198-1218
PO BOX 27219, SAN DIEGO, CA 92198-1219
PO BOX 27220, SAN DIEGO, CA 92198-1220
PO BOX 27221, SAN DIEGO, CA 92198-1221
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