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 11101, SANTA BARBARA, CA 93107-1101
PO BOX 11102, SANTA BARBARA, CA 93107-1102
PO BOX 11103, SANTA BARBARA, CA 93107-1103
PO BOX 11104, SANTA BARBARA, CA 93107-1104
PO BOX 11105, SANTA BARBARA, CA 93107-1105
PO BOX 11106, SANTA BARBARA, CA 93107-1106
PO BOX 11107, SANTA BARBARA, CA 93107-1107
PO BOX 11108, SANTA BARBARA, CA 93107-1108
PO BOX 11109, SANTA BARBARA, CA 93107-1109
PO BOX 11110, SANTA BARBARA, CA 93107-1110
PO BOX 11111, SANTA BARBARA, CA 93107-1111
PO BOX 11112, SANTA BARBARA, CA 93107-1112
PO BOX 11113, SANTA BARBARA, CA 93107-1113
PO BOX 11114, SANTA BARBARA, CA 93107-1114
PO BOX 11115, SANTA BARBARA, CA 93107-1115
PO BOX 11116, SANTA BARBARA, CA 93107-1116
PO BOX 11117, SANTA BARBARA, CA 93107-1117
PO BOX 11118, SANTA BARBARA, CA 93107-1118
PO BOX 11119, SANTA BARBARA, CA 93107-1119
PO BOX 11120, SANTA BARBARA, CA 93107-1120
PO BOX 11121, SANTA BARBARA, CA 93107-1121
PO BOX 11122, SANTA BARBARA, CA 93107-1122
PO BOX 11123, SANTA BARBARA, CA 93107-1123
PO BOX 11124, SANTA BARBARA, CA 93107-1124
PO BOX 11125, SANTA BARBARA, CA 93107-1125
PO BOX 11126, SANTA BARBARA, CA 93107-1126
PO BOX 11127, SANTA BARBARA, CA 93107-1127
PO BOX 11128, SANTA BARBARA, CA 93107-1128
PO BOX 11129, SANTA BARBARA, CA 93107-1129
PO BOX 11130, SANTA BARBARA, CA 93107-1130
PO BOX 11131, SANTA BARBARA, CA 93107-1131
PO BOX 11132, SANTA BARBARA, CA 93107-1132
PO BOX 11133, SANTA BARBARA, CA 93107-1133
PO BOX 11134, SANTA BARBARA, CA 93107-1134
PO BOX 11135, SANTA BARBARA, CA 93107-1135
PO BOX 11136, SANTA BARBARA, CA 93107-1136
PO BOX 11137, SANTA BARBARA, CA 93107-1137
PO BOX 11138, SANTA BARBARA, CA 93107-1138
PO BOX 11139, SANTA BARBARA, CA 93107-1139
PO BOX 11140, SANTA BARBARA, CA 93107-1140
PO BOX 11141, SANTA BARBARA, CA 93107-1141
PO BOX 11142, SANTA BARBARA, CA 93107-1142
PO BOX 11143, SANTA BARBARA, CA 93107-1143
PO BOX 11144, SANTA BARBARA, CA 93107-1144
PO BOX 11145, SANTA BARBARA, CA 93107-1145
PO BOX 11146, SANTA BARBARA, CA 93107-1146
PO BOX 11147, SANTA BARBARA, CA 93107-1147
PO BOX 11148, SANTA BARBARA, CA 93107-1148
PO BOX 11149, SANTA BARBARA, CA 93107-1149
PO BOX 11150, SANTA BARBARA, CA 93107-1150
PO BOX 11151, SANTA BARBARA, CA 93107-1151
PO BOX 11152, SANTA BARBARA, CA 93107-1152
PO BOX 11153, SANTA BARBARA, CA 93107-1153
PO BOX 11154, SANTA BARBARA, CA 93107-1154
PO BOX 11155, SANTA BARBARA, CA 93107-1155
PO BOX 11156, SANTA BARBARA, CA 93107-1156
PO BOX 11157, SANTA BARBARA, CA 93107-1157
PO BOX 11158, SANTA BARBARA, CA 93107-1158
PO BOX 11159, SANTA BARBARA, CA 93107-1159
PO BOX 11160, SANTA BARBARA, CA 93107-1160
PO BOX 11161, SANTA BARBARA, CA 93107-1161
PO BOX 11162, SANTA BARBARA, CA 93107-1162
PO BOX 11163, SANTA BARBARA, CA 93107-1163
PO BOX 11164, SANTA BARBARA, CA 93107-1164
PO BOX 11165, SANTA BARBARA, CA 93107-1165
PO BOX 11166, SANTA BARBARA, CA 93107-1166
PO BOX 11167, SANTA BARBARA, CA 93107-1167
PO BOX 11168, SANTA BARBARA, CA 93107-1168
PO BOX 11169, SANTA BARBARA, CA 93107-1169
PO BOX 11170, SANTA BARBARA, CA 93107-1170
PO BOX 11171, SANTA BARBARA, CA 93107-1171
PO BOX 11172, SANTA BARBARA, CA 93107-1172
PO BOX 11173, SANTA BARBARA, CA 93107-1173
PO BOX 11174, SANTA BARBARA, CA 93107-1174
PO BOX 11175, SANTA BARBARA, CA 93107-1175
PO BOX 11176, SANTA BARBARA, CA 93107-1176
PO BOX 11177, SANTA BARBARA, CA 93107-1177
PO BOX 11178, SANTA BARBARA, CA 93107-1178
PO BOX 11179, SANTA BARBARA, CA 93107-1179
PO BOX 11180, SANTA BARBARA, CA 93107-1180
PO BOX 11181, SANTA BARBARA, CA 93107-1181
PO BOX 11182, SANTA BARBARA, CA 93107-1182
PO BOX 11183, SANTA BARBARA, CA 93107-1183
PO BOX 11184, SANTA BARBARA, CA 93107-1184
PO BOX 11185, SANTA BARBARA, CA 93107-1185
PO BOX 11186, SANTA BARBARA, CA 93107-1186
PO BOX 11187, SANTA BARBARA, CA 93107-1187
PO BOX 11188, SANTA BARBARA, CA 93107-1188
PO BOX 11189, SANTA BARBARA, CA 93107-1189
PO BOX 11190, SANTA BARBARA, CA 93107-1190
PO BOX 11191, SANTA BARBARA, CA 93107-1191
PO BOX 11192, SANTA BARBARA, CA 93107-1192
PO BOX 11193, SANTA BARBARA, CA 93107-1193
PO BOX 11194, SANTA BARBARA, CA 93107-1194
PO BOX 11195, SANTA BARBARA, CA 93107-1195
PO BOX 11196, SANTA BARBARA, CA 93107-1196
PO BOX 11197, SANTA BARBARA, CA 93107-1197
PO BOX 11198, SANTA BARBARA, CA 93107-1198
PO BOX 11199, SANTA BARBARA, CA 93107-1199
PO BOX 11200, SANTA BARBARA, CA 93107-1200
PO BOX 11201, SANTA BARBARA, CA 93107-1201
PO BOX 11202, SANTA BARBARA, CA 93107-1202
PO BOX 11203, SANTA BARBARA, CA 93107-1203
PO BOX 11204, SANTA BARBARA, CA 93107-1204
PO BOX 11205, SANTA BARBARA, CA 93107-1205
PO BOX 11206, SANTA BARBARA, CA 93107-1206
PO BOX 11207, SANTA BARBARA, CA 93107-1207
PO BOX 11208, SANTA BARBARA, CA 93107-1208
PO BOX 11209, SANTA BARBARA, CA 93107-1209
PO BOX 11210, SANTA BARBARA, CA 93107-1210
PO BOX 11211, SANTA BARBARA, CA 93107-1211
PO BOX 11212, SANTA BARBARA, CA 93107-1212
PO BOX 11213, SANTA BARBARA, CA 93107-1213
PO BOX 11214, SANTA BARBARA, CA 93107-1214
PO BOX 11215, SANTA BARBARA, CA 93107-1215
PO BOX 11216, SANTA BARBARA, CA 93107-1216
PO BOX 11217, SANTA BARBARA, CA 93107-1217
PO BOX 11218, SANTA BARBARA, CA 93107-1218
PO BOX 11219, SANTA BARBARA, CA 93107-1219
PO BOX 11220, SANTA BARBARA, CA 93107-1220
PO BOX 11221, SANTA BARBARA, CA 93107-1221
PO BOX 11222, SANTA BARBARA, CA 93107-1222
PO BOX 11223, SANTA BARBARA, CA 93107-1223
PO BOX 11224, SANTA BARBARA, CA 93107-1224
PO BOX 11225, SANTA BARBARA, CA 93107-1225
PO BOX 11226, SANTA BARBARA, CA 93107-1226
PO BOX 11227, SANTA BARBARA, CA 93107-1227
PO BOX 11228, SANTA BARBARA, CA 93107-1228
PO BOX 11229, SANTA BARBARA, CA 93107-1229
PO BOX 11230, SANTA BARBARA, CA 93107-1230
PO BOX 11231, SANTA BARBARA, CA 93107-1231
PO BOX 11232, SANTA BARBARA, CA 93107-1232
PO BOX 11233, SANTA BARBARA, CA 93107-1233
PO BOX 11234, SANTA BARBARA, CA 93107-1234
PO BOX 11235, SANTA BARBARA, CA 93107-1235
PO BOX 11236, SANTA BARBARA, CA 93107-1236
PO BOX 11237, SANTA BARBARA, CA 93107-1237
PO BOX 11238, SANTA BARBARA, CA 93107-1238
PO BOX 11239, SANTA BARBARA, CA 93107-1239
PO BOX 11240, SANTA BARBARA, CA 93107-1240
PO BOX 11241, SANTA BARBARA, CA 93107-1241
PO BOX 11242, SANTA BARBARA, CA 93107-1242
PO BOX 11243, SANTA BARBARA, CA 93107-1243
PO BOX 11244, SANTA BARBARA, CA 93107-1244
PO BOX 11245, SANTA BARBARA, CA 93107-1245
PO BOX 11246, SANTA BARBARA, CA 93107-1246
PO BOX 11247, SANTA BARBARA, CA 93107-1247
PO BOX 11248, SANTA BARBARA, CA 93107-1248
PO BOX 11249, SANTA BARBARA, CA 93107-1249
PO BOX 11250, SANTA BARBARA, CA 93107-1250
PO BOX 11251, SANTA BARBARA, CA 93107-1251
PO BOX 11252, SANTA BARBARA, CA 93107-1252
PO BOX 11253, SANTA BARBARA, CA 93107-1253
PO BOX 11254, SANTA BARBARA, CA 93107-1254
PO BOX 11255, SANTA BARBARA, CA 93107-1255
PO BOX 11256, SANTA BARBARA, CA 93107-1256
PO BOX 11257, SANTA BARBARA, CA 93107-1257
PO BOX 11258, SANTA BARBARA, CA 93107-1258
PO BOX 11259, SANTA BARBARA, CA 93107-1259
PO BOX 11260, SANTA BARBARA, CA 93107-1260
PO BOX 11261, SANTA BARBARA, CA 93107-1261
PO BOX 11262, SANTA BARBARA, CA 93107-1262
PO BOX 11263, SANTA BARBARA, CA 93107-1263
PO BOX 11264, SANTA BARBARA, CA 93107-1264
PO BOX 11265, SANTA BARBARA, CA 93107-1265
PO BOX 11266, SANTA BARBARA, CA 93107-1266
PO BOX 11267, SANTA BARBARA, CA 93107-1267
PO BOX 11268, SANTA BARBARA, CA 93107-1268
PO BOX 11269, SANTA BARBARA, CA 93107-1269
PO BOX 11270, SANTA BARBARA, CA 93107-1270
PO BOX 11271, SANTA BARBARA, CA 93107-1271
PO BOX 11272, SANTA BARBARA, CA 93107-1272
PO BOX 11273, SANTA BARBARA, CA 93107-1273
PO BOX 11274, SANTA BARBARA, CA 93107-1274
PO BOX 11275, SANTA BARBARA, CA 93107-1275
PO BOX 11276, SANTA BARBARA, CA 93107-1276
PO BOX 11277, SANTA BARBARA, CA 93107-1277
PO BOX 11278, SANTA BARBARA, CA 93107-1278
PO BOX 11279, SANTA BARBARA, CA 93107-1279
PO BOX 11280, SANTA BARBARA, CA 93107-1280
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