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 51021, IDAHO FALLS, ID 83405-1021
PO BOX 51022, IDAHO FALLS, ID 83405-1022
PO BOX 51023, IDAHO FALLS, ID 83405-1023
PO BOX 51024, IDAHO FALLS, ID 83405-1024
PO BOX 51025, IDAHO FALLS, ID 83405-1025
PO BOX 51026, IDAHO FALLS, ID 83405-1026
PO BOX 51027, IDAHO FALLS, ID 83405-1027
PO BOX 51028, IDAHO FALLS, ID 83405-1028
PO BOX 51029, IDAHO FALLS, ID 83405-1029
PO BOX 51030, IDAHO FALLS, ID 83405-1030
PO BOX 51031, IDAHO FALLS, ID 83405-1031
PO BOX 51032, IDAHO FALLS, ID 83405-1032
PO BOX 51033, IDAHO FALLS, ID 83405-1033
PO BOX 51034, IDAHO FALLS, ID 83405-1034
PO BOX 51035, IDAHO FALLS, ID 83405-1035
PO BOX 51036, IDAHO FALLS, ID 83405-1036
PO BOX 51037, IDAHO FALLS, ID 83405-1037
PO BOX 51038, IDAHO FALLS, ID 83405-1038
PO BOX 51039, IDAHO FALLS, ID 83405-1039
PO BOX 51040, IDAHO FALLS, ID 83405-1040
PO BOX 51041, IDAHO FALLS, ID 83405-1041
PO BOX 51042, IDAHO FALLS, ID 83405-1042
PO BOX 51043, IDAHO FALLS, ID 83405-1043
PO BOX 51044, IDAHO FALLS, ID 83405-1044
PO BOX 51045, IDAHO FALLS, ID 83405-1045
PO BOX 51046, IDAHO FALLS, ID 83405-1046
PO BOX 51047, IDAHO FALLS, ID 83405-1047
PO BOX 51048, IDAHO FALLS, ID 83405-1048
PO BOX 51049, IDAHO FALLS, ID 83405-1049
PO BOX 51050, IDAHO FALLS, ID 83405-1050
PO BOX 51051, IDAHO FALLS, ID 83405-1051
PO BOX 51052, IDAHO FALLS, ID 83405-1052
PO BOX 51053, IDAHO FALLS, ID 83405-1053
PO BOX 51054, IDAHO FALLS, ID 83405-1054
PO BOX 51055, IDAHO FALLS, ID 83405-1055
PO BOX 51056, IDAHO FALLS, ID 83405-1056
PO BOX 51057, IDAHO FALLS, ID 83405-1057
PO BOX 51058, IDAHO FALLS, ID 83405-1058
PO BOX 51059, IDAHO FALLS, ID 83405-1059
PO BOX 51060, IDAHO FALLS, ID 83405-1060
PO BOX 51061, IDAHO FALLS, ID 83405-1061
PO BOX 51062, IDAHO FALLS, ID 83405-1062
PO BOX 51063, IDAHO FALLS, ID 83405-1063
PO BOX 51064, IDAHO FALLS, ID 83405-1064
PO BOX 51065, IDAHO FALLS, ID 83405-1065
PO BOX 51066, IDAHO FALLS, ID 83405-1066
PO BOX 51067, IDAHO FALLS, ID 83405-1067
PO BOX 51068, IDAHO FALLS, ID 83405-1068
PO BOX 51069, IDAHO FALLS, ID 83405-1069
PO BOX 51070, IDAHO FALLS, ID 83405-1070
PO BOX 51071, IDAHO FALLS, ID 83405-1071
PO BOX 51072, IDAHO FALLS, ID 83405-1072
PO BOX 51073, IDAHO FALLS, ID 83405-1073
PO BOX 51074, IDAHO FALLS, ID 83405-1074
PO BOX 51075, IDAHO FALLS, ID 83405-1075
PO BOX 51076, IDAHO FALLS, ID 83405-1076
PO BOX 51077, IDAHO FALLS, ID 83405-1077
PO BOX 51078, IDAHO FALLS, ID 83405-1078
PO BOX 51079, IDAHO FALLS, ID 83405-1079
PO BOX 51080, IDAHO FALLS, ID 83405-1080
PO BOX 51081, IDAHO FALLS, ID 83405-1081
PO BOX 51082, IDAHO FALLS, ID 83405-1082
PO BOX 51083, IDAHO FALLS, ID 83405-1083
PO BOX 51084, IDAHO FALLS, ID 83405-1084
PO BOX 51085, IDAHO FALLS, ID 83405-1085
PO BOX 51086, IDAHO FALLS, ID 83405-1086
PO BOX 51087, IDAHO FALLS, ID 83405-1087
PO BOX 51088, IDAHO FALLS, ID 83405-1088
PO BOX 51089, IDAHO FALLS, ID 83405-1089
PO BOX 51090, IDAHO FALLS, ID 83405-1090
PO BOX 51091, IDAHO FALLS, ID 83405-1091
PO BOX 51092, IDAHO FALLS, ID 83405-1092
PO BOX 51093, IDAHO FALLS, ID 83405-1093
PO BOX 51094, IDAHO FALLS, ID 83405-1094
PO BOX 51095, IDAHO FALLS, ID 83405-1095
PO BOX 51096, IDAHO FALLS, ID 83405-1096
PO BOX 51097, IDAHO FALLS, ID 83405-1097
PO BOX 51098, IDAHO FALLS, ID 83405-1098
PO BOX 51099, IDAHO FALLS, ID 83405-1099
PO BOX 51100, IDAHO FALLS, ID 83405-1100
PO BOX 51101, IDAHO FALLS, ID 83405-1101
PO BOX 51102, IDAHO FALLS, ID 83405-1102
PO BOX 51103, IDAHO FALLS, ID 83405-1103
PO BOX 51104, IDAHO FALLS, ID 83405-1104
PO BOX 51105, IDAHO FALLS, ID 83405-1105
PO BOX 51106, IDAHO FALLS, ID 83405-1106
PO BOX 51107, IDAHO FALLS, ID 83405-1107
PO BOX 51108, IDAHO FALLS, ID 83405-1108
PO BOX 51109, IDAHO FALLS, ID 83405-1109
PO BOX 51110, IDAHO FALLS, ID 83405-1110
PO BOX 51111, IDAHO FALLS, ID 83405-1111
PO BOX 51112, IDAHO FALLS, ID 83405-1112
PO BOX 51113, IDAHO FALLS, ID 83405-1113
PO BOX 51114, IDAHO FALLS, ID 83405-1114
PO BOX 51115, IDAHO FALLS, ID 83405-1115
PO BOX 51116, IDAHO FALLS, ID 83405-1116
PO BOX 51117, IDAHO FALLS, ID 83405-1117
PO BOX 51118, IDAHO FALLS, ID 83405-1118
PO BOX 51119, IDAHO FALLS, ID 83405-1119
PO BOX 51120, IDAHO FALLS, ID 83405-1120
PO BOX 51121, IDAHO FALLS, ID 83405-1121
PO BOX 51122, IDAHO FALLS, ID 83405-1122
PO BOX 51123, IDAHO FALLS, ID 83405-1123
PO BOX 51124, IDAHO FALLS, ID 83405-1124
PO BOX 51125, IDAHO FALLS, ID 83405-1125
PO BOX 51126, IDAHO FALLS, ID 83405-1126
PO BOX 51127, IDAHO FALLS, ID 83405-1127
PO BOX 51128, IDAHO FALLS, ID 83405-1128
PO BOX 51129, IDAHO FALLS, ID 83405-1129
PO BOX 51130, IDAHO FALLS, ID 83405-1130
PO BOX 51131, IDAHO FALLS, ID 83405-1131
PO BOX 51132, IDAHO FALLS, ID 83405-1132
PO BOX 51133, IDAHO FALLS, ID 83405-1133
PO BOX 51134, IDAHO FALLS, ID 83405-1134
PO BOX 51135, IDAHO FALLS, ID 83405-1135
PO BOX 51136, IDAHO FALLS, ID 83405-1136
PO BOX 51137, IDAHO FALLS, ID 83405-1137
PO BOX 51138, IDAHO FALLS, ID 83405-1138
PO BOX 51139, IDAHO FALLS, ID 83405-1139
PO BOX 51140, IDAHO FALLS, ID 83405-1140
PO BOX 51141, IDAHO FALLS, ID 83405-1141
PO BOX 51142, IDAHO FALLS, ID 83405-1142
PO BOX 51143, IDAHO FALLS, ID 83405-1143
PO BOX 51144, IDAHO FALLS, ID 83405-1144
PO BOX 51145, IDAHO FALLS, ID 83405-1145
PO BOX 51146, IDAHO FALLS, ID 83405-1146
PO BOX 51147, IDAHO FALLS, ID 83405-1147
PO BOX 51148, IDAHO FALLS, ID 83405-1148
PO BOX 51149, IDAHO FALLS, ID 83405-1149
PO BOX 51150, IDAHO FALLS, ID 83405-1150
PO BOX 51151, IDAHO FALLS, ID 83405-1151
PO BOX 51152, IDAHO FALLS, ID 83405-1152
PO BOX 51153, IDAHO FALLS, ID 83405-1153
PO BOX 51154, IDAHO FALLS, ID 83405-1154
PO BOX 51155, IDAHO FALLS, ID 83405-1155
PO BOX 51156, IDAHO FALLS, ID 83405-1156
PO BOX 51157, IDAHO FALLS, ID 83405-1157
PO BOX 51158, IDAHO FALLS, ID 83405-1158
PO BOX 51159, IDAHO FALLS, ID 83405-1159
PO BOX 51160, IDAHO FALLS, ID 83405-1160
PO BOX 51161, IDAHO FALLS, ID 83405-1161
PO BOX 51162, IDAHO FALLS, ID 83405-1162
PO BOX 51163, IDAHO FALLS, ID 83405-1163
PO BOX 51164, IDAHO FALLS, ID 83405-1164
PO BOX 51165, IDAHO FALLS, ID 83405-1165
PO BOX 51166, IDAHO FALLS, ID 83405-1166
PO BOX 51167, IDAHO FALLS, ID 83405-1167
PO BOX 51168, IDAHO FALLS, ID 83405-1168
PO BOX 51169, IDAHO FALLS, ID 83405-1169
PO BOX 51170, IDAHO FALLS, ID 83405-1170
PO BOX 51171, IDAHO FALLS, ID 83405-1171
PO BOX 51172, IDAHO FALLS, ID 83405-1172
PO BOX 51173, IDAHO FALLS, ID 83405-1173
PO BOX 51174, IDAHO FALLS, ID 83405-1174
PO BOX 51175, IDAHO FALLS, ID 83405-1175
PO BOX 51176, IDAHO FALLS, ID 83405-1176
PO BOX 51177, IDAHO FALLS, ID 83405-1177
PO BOX 51178, IDAHO FALLS, ID 83405-1178
PO BOX 51179, IDAHO FALLS, ID 83405-1179
PO BOX 51180, IDAHO FALLS, ID 83405-1180
PO BOX 51181, IDAHO FALLS, ID 83405-1181
PO BOX 51182, IDAHO FALLS, ID 83405-1182
PO BOX 51183, IDAHO FALLS, ID 83405-1183
PO BOX 51184, IDAHO FALLS, ID 83405-1184
PO BOX 51185, IDAHO FALLS, ID 83405-1185
PO BOX 51186, IDAHO FALLS, ID 83405-1186
PO BOX 51187, IDAHO FALLS, ID 83405-1187
PO BOX 51188, IDAHO FALLS, ID 83405-1188
PO BOX 51189, IDAHO FALLS, ID 83405-1189
PO BOX 51190, IDAHO FALLS, ID 83405-1190
PO BOX 51191, IDAHO FALLS, ID 83405-1191
PO BOX 51192, IDAHO FALLS, ID 83405-1192
PO BOX 51193, IDAHO FALLS, ID 83405-1193
PO BOX 51194, IDAHO FALLS, ID 83405-1194
PO BOX 51195, IDAHO FALLS, ID 83405-1195
PO BOX 51196, IDAHO FALLS, ID 83405-1196
PO BOX 51197, IDAHO FALLS, ID 83405-1197
PO BOX 51198, IDAHO FALLS, ID 83405-1198
PO BOX 51199, IDAHO FALLS, ID 83405-1199
PO BOX 51200, IDAHO FALLS, ID 83405-1200
PO BOX 51201, IDAHO FALLS, ID 83405-1201
PO BOX 51202, IDAHO FALLS, ID 83405-1202
PO BOX 51203, IDAHO FALLS, ID 83405-1203
PO BOX 51204, IDAHO FALLS, ID 83405-1204
PO BOX 51205, IDAHO FALLS, ID 83405-1205
PO BOX 51206, IDAHO FALLS, ID 83405-1206
PO BOX 51207, IDAHO FALLS, ID 83405-1207
PO BOX 51208, IDAHO FALLS, ID 83405-1208
PO BOX 51209, IDAHO FALLS, ID 83405-1209
PO BOX 51210, IDAHO FALLS, ID 83405-1210
PO BOX 51211, IDAHO FALLS, ID 83405-1211
PO BOX 51212, IDAHO FALLS, ID 83405-1212
PO BOX 51213, IDAHO FALLS, ID 83405-1213
PO BOX 51214, IDAHO FALLS, ID 83405-1214
PO BOX 51215, IDAHO FALLS, ID 83405-1215
PO BOX 51216, IDAHO FALLS, ID 83405-1216
PO BOX 51217, IDAHO FALLS, ID 83405-1217
PO BOX 51218, IDAHO FALLS, ID 83405-1218
PO BOX 51219, IDAHO FALLS, ID 83405-1219
PO BOX 51220, IDAHO FALLS, ID 83405-1220
PO BOX 51221, IDAHO FALLS, ID 83405-1221
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