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 221001, SALT LAKE CITY, UT 84122-1001
PO BOX 221002, SALT LAKE CITY, UT 84122-1002
PO BOX 221003, SALT LAKE CITY, UT 84122-1003
PO BOX 221004, SALT LAKE CITY, UT 84122-1004
PO BOX 221005, SALT LAKE CITY, UT 84122-1005
PO BOX 221006, SALT LAKE CITY, UT 84122-1006
PO BOX 221007, SALT LAKE CITY, UT 84122-1007
PO BOX 221008, SALT LAKE CITY, UT 84122-1008
PO BOX 221009, SALT LAKE CITY, UT 84122-1009
PO BOX 221010, SALT LAKE CITY, UT 84122-1010
PO BOX 221011, SALT LAKE CITY, UT 84122-1011
PO BOX 221012, SALT LAKE CITY, UT 84122-1012
PO BOX 221013, SALT LAKE CITY, UT 84122-1013
PO BOX 221014, SALT LAKE CITY, UT 84122-1014
PO BOX 221015, SALT LAKE CITY, UT 84122-1015
PO BOX 221016, SALT LAKE CITY, UT 84122-1016
PO BOX 221017, SALT LAKE CITY, UT 84122-1017
PO BOX 221018, SALT LAKE CITY, UT 84122-1018
PO BOX 221019, SALT LAKE CITY, UT 84122-1019
PO BOX 221020, SALT LAKE CITY, UT 84122-1020
PO BOX 221021, SALT LAKE CITY, UT 84122-1021
PO BOX 221022, SALT LAKE CITY, UT 84122-1022
PO BOX 221023, SALT LAKE CITY, UT 84122-1023
PO BOX 221024, SALT LAKE CITY, UT 84122-1024
PO BOX 221025, SALT LAKE CITY, UT 84122-1025
PO BOX 221026, SALT LAKE CITY, UT 84122-1026
PO BOX 221027, SALT LAKE CITY, UT 84122-1027
PO BOX 221028, SALT LAKE CITY, UT 84122-1028
PO BOX 221029, SALT LAKE CITY, UT 84122-1029
PO BOX 221030, SALT LAKE CITY, UT 84122-1030
PO BOX 221031, SALT LAKE CITY, UT 84122-1031
PO BOX 221032, SALT LAKE CITY, UT 84122-1032
PO BOX 221033, SALT LAKE CITY, UT 84122-1033
PO BOX 221034, SALT LAKE CITY, UT 84122-1034
PO BOX 221035, SALT LAKE CITY, UT 84122-1035
PO BOX 221036, SALT LAKE CITY, UT 84122-1036
PO BOX 221037, SALT LAKE CITY, UT 84122-1037
PO BOX 221038, SALT LAKE CITY, UT 84122-1038
PO BOX 221039, SALT LAKE CITY, UT 84122-1039
PO BOX 221040, SALT LAKE CITY, UT 84122-1040
PO BOX 221041, SALT LAKE CITY, UT 84122-1041
PO BOX 221042, SALT LAKE CITY, UT 84122-1042
PO BOX 221043, SALT LAKE CITY, UT 84122-1043
PO BOX 221044, SALT LAKE CITY, UT 84122-1044
PO BOX 221045, SALT LAKE CITY, UT 84122-1045
PO BOX 221046, SALT LAKE CITY, UT 84122-1046
PO BOX 221047, SALT LAKE CITY, UT 84122-1047
PO BOX 221048, SALT LAKE CITY, UT 84122-1048
PO BOX 221049, SALT LAKE CITY, UT 84122-1049
PO BOX 221050, SALT LAKE CITY, UT 84122-1050
PO BOX 221051, SALT LAKE CITY, UT 84122-1051
PO BOX 221052, SALT LAKE CITY, UT 84122-1052
PO BOX 221053, SALT LAKE CITY, UT 84122-1053
PO BOX 221054, SALT LAKE CITY, UT 84122-1054
PO BOX 221055, SALT LAKE CITY, UT 84122-1055
PO BOX 221056, SALT LAKE CITY, UT 84122-1056
PO BOX 221057, SALT LAKE CITY, UT 84122-1057
PO BOX 221058, SALT LAKE CITY, UT 84122-1058
PO BOX 221059, SALT LAKE CITY, UT 84122-1059
PO BOX 221060, SALT LAKE CITY, UT 84122-1060
PO BOX 221061, SALT LAKE CITY, UT 84122-1061
PO BOX 221062, SALT LAKE CITY, UT 84122-1062
PO BOX 221063, SALT LAKE CITY, UT 84122-1063
PO BOX 221064, SALT LAKE CITY, UT 84122-1064
PO BOX 221065, SALT LAKE CITY, UT 84122-1065
PO BOX 221066, SALT LAKE CITY, UT 84122-1066
PO BOX 221067, SALT LAKE CITY, UT 84122-1067
PO BOX 221068, SALT LAKE CITY, UT 84122-1068
PO BOX 221069, SALT LAKE CITY, UT 84122-1069
PO BOX 221070, SALT LAKE CITY, UT 84122-1070
PO BOX 221071, SALT LAKE CITY, UT 84122-1071
PO BOX 221072, SALT LAKE CITY, UT 84122-1072
PO BOX 221073, SALT LAKE CITY, UT 84122-1073
PO BOX 221074, SALT LAKE CITY, UT 84122-1074
PO BOX 221075, SALT LAKE CITY, UT 84122-1075
PO BOX 221076, SALT LAKE CITY, UT 84122-1076
PO BOX 221077, SALT LAKE CITY, UT 84122-1077
PO BOX 221078, SALT LAKE CITY, UT 84122-1078
PO BOX 221079, SALT LAKE CITY, UT 84122-1079
PO BOX 221080, SALT LAKE CITY, UT 84122-1080
PO BOX 221081, SALT LAKE CITY, UT 84122-1081
PO BOX 221082, SALT LAKE CITY, UT 84122-1082
PO BOX 221083, SALT LAKE CITY, UT 84122-1083
PO BOX 221084, SALT LAKE CITY, UT 84122-1084
PO BOX 221085, SALT LAKE CITY, UT 84122-1085
PO BOX 221086, SALT LAKE CITY, UT 84122-1086
PO BOX 221087, SALT LAKE CITY, UT 84122-1087
PO BOX 221088, SALT LAKE CITY, UT 84122-1088
PO BOX 221089, SALT LAKE CITY, UT 84122-1089
PO BOX 221090, SALT LAKE CITY, UT 84122-1090
PO BOX 221091, SALT LAKE CITY, UT 84122-1091
PO BOX 221092, SALT LAKE CITY, UT 84122-1092
PO BOX 221093, SALT LAKE CITY, UT 84122-1093
PO BOX 221094, SALT LAKE CITY, UT 84122-1094
PO BOX 221095, SALT LAKE CITY, UT 84122-1095
PO BOX 221096, SALT LAKE CITY, UT 84122-1096
PO BOX 221097, SALT LAKE CITY, UT 84122-1097
PO BOX 221098, SALT LAKE CITY, UT 84122-1098
PO BOX 221099, SALT LAKE CITY, UT 84122-1099
PO BOX 221100, SALT LAKE CITY, UT 84122-1100
PO BOX 221101, SALT LAKE CITY, UT 84122-1101
PO BOX 221102, SALT LAKE CITY, UT 84122-1102
PO BOX 221103, SALT LAKE CITY, UT 84122-1103
PO BOX 221104, SALT LAKE CITY, UT 84122-1104
PO BOX 221105, SALT LAKE CITY, UT 84122-1105
PO BOX 221106, SALT LAKE CITY, UT 84122-1106
PO BOX 221107, SALT LAKE CITY, UT 84122-1107
PO BOX 221108, SALT LAKE CITY, UT 84122-1108
PO BOX 221109, SALT LAKE CITY, UT 84122-1109
PO BOX 221110, SALT LAKE CITY, UT 84122-1110
PO BOX 221111, SALT LAKE CITY, UT 84122-1111
PO BOX 221112, SALT LAKE CITY, UT 84122-1112
PO BOX 221113, SALT LAKE CITY, UT 84122-1113
PO BOX 221114, SALT LAKE CITY, UT 84122-1114
PO BOX 221115, SALT LAKE CITY, UT 84122-1115
PO BOX 221116, SALT LAKE CITY, UT 84122-1116
PO BOX 221117, SALT LAKE CITY, UT 84122-1117
PO BOX 221118, SALT LAKE CITY, UT 84122-1118
PO BOX 221119, SALT LAKE CITY, UT 84122-1119
PO BOX 221120, SALT LAKE CITY, UT 84122-1120
PO BOX 221121, SALT LAKE CITY, UT 84122-1121
PO BOX 221122, SALT LAKE CITY, UT 84122-1122
PO BOX 221123, SALT LAKE CITY, UT 84122-1123
PO BOX 221124, SALT LAKE CITY, UT 84122-1124
PO BOX 221125, SALT LAKE CITY, UT 84122-1125
PO BOX 221126, SALT LAKE CITY, UT 84122-1126
PO BOX 221127, SALT LAKE CITY, UT 84122-1127
PO BOX 221128, SALT LAKE CITY, UT 84122-1128
PO BOX 221129, SALT LAKE CITY, UT 84122-1129
PO BOX 221130, SALT LAKE CITY, UT 84122-1130
PO BOX 221131, SALT LAKE CITY, UT 84122-1131
PO BOX 221132, SALT LAKE CITY, UT 84122-1132
PO BOX 221133, SALT LAKE CITY, UT 84122-1133
PO BOX 221134, SALT LAKE CITY, UT 84122-1134
PO BOX 221135, SALT LAKE CITY, UT 84122-1135
PO BOX 221136, SALT LAKE CITY, UT 84122-1136
PO BOX 221137, SALT LAKE CITY, UT 84122-1137
PO BOX 221138, SALT LAKE CITY, UT 84122-1138
PO BOX 221139, SALT LAKE CITY, UT 84122-1139
PO BOX 221140, SALT LAKE CITY, UT 84122-1140
PO BOX 221141, SALT LAKE CITY, UT 84122-1141
PO BOX 221142, SALT LAKE CITY, UT 84122-1142
PO BOX 221143, SALT LAKE CITY, UT 84122-1143
PO BOX 221144, SALT LAKE CITY, UT 84122-1144
PO BOX 221145, SALT LAKE CITY, UT 84122-1145
PO BOX 221146, SALT LAKE CITY, UT 84122-1146
PO BOX 221147, SALT LAKE CITY, UT 84122-1147
PO BOX 221148, SALT LAKE CITY, UT 84122-1148
PO BOX 221149, SALT LAKE CITY, UT 84122-1149
PO BOX 221150, SALT LAKE CITY, UT 84122-1150
PO BOX 221151, SALT LAKE CITY, UT 84122-1151
PO BOX 221152, SALT LAKE CITY, UT 84122-1152
PO BOX 221153, SALT LAKE CITY, UT 84122-1153
PO BOX 221154, SALT LAKE CITY, UT 84122-1154
PO BOX 221155, SALT LAKE CITY, UT 84122-1155
PO BOX 221156, SALT LAKE CITY, UT 84122-1156
PO BOX 221157, SALT LAKE CITY, UT 84122-1157
PO BOX 221158, SALT LAKE CITY, UT 84122-1158
PO BOX 221159, SALT LAKE CITY, UT 84122-1159
PO BOX 221160, SALT LAKE CITY, UT 84122-1160
PO BOX 221161, SALT LAKE CITY, UT 84122-1161
PO BOX 221162, SALT LAKE CITY, UT 84122-1162
PO BOX 221163, SALT LAKE CITY, UT 84122-1163
PO BOX 221164, SALT LAKE CITY, UT 84122-1164
PO BOX 221165, SALT LAKE CITY, UT 84122-1165
PO BOX 221166, SALT LAKE CITY, UT 84122-1166
PO BOX 221167, SALT LAKE CITY, UT 84122-1167
PO BOX 221168, SALT LAKE CITY, UT 84122-1168
PO BOX 221169, SALT LAKE CITY, UT 84122-1169
PO BOX 221170, SALT LAKE CITY, UT 84122-1170
PO BOX 221171, SALT LAKE CITY, UT 84122-1171
PO BOX 221172, SALT LAKE CITY, UT 84122-1172
PO BOX 221173, SALT LAKE CITY, UT 84122-1173
PO BOX 221174, SALT LAKE CITY, UT 84122-1174
PO BOX 221175, SALT LAKE CITY, UT 84122-1175
PO BOX 221176, SALT LAKE CITY, UT 84122-1176
PO BOX 221177, SALT LAKE CITY, UT 84122-1177
PO BOX 221178, SALT LAKE CITY, UT 84122-1178
PO BOX 221179, SALT LAKE CITY, UT 84122-1179
PO BOX 221180, SALT LAKE CITY, UT 84122-1180
PO BOX 221181, SALT LAKE CITY, UT 84122-1181
PO BOX 221182, SALT LAKE CITY, UT 84122-1182
PO BOX 221183, SALT LAKE CITY, UT 84122-1183
PO BOX 221184, SALT LAKE CITY, UT 84122-1184
PO BOX 221185, SALT LAKE CITY, UT 84122-1185
PO BOX 221186, SALT LAKE CITY, UT 84122-1186
PO BOX 221187, SALT LAKE CITY, UT 84122-1187
PO BOX 221188, SALT LAKE CITY, UT 84122-1188
PO BOX 221189, SALT LAKE CITY, UT 84122-1189
PO BOX 221190, SALT LAKE CITY, UT 84122-1190
PO BOX 221191, SALT LAKE CITY, UT 84122-1191
PO BOX 221192, SALT LAKE CITY, UT 84122-1192
PO BOX 221193, SALT LAKE CITY, UT 84122-1193
PO BOX 221194, SALT LAKE CITY, UT 84122-1194
PO BOX 221195, SALT LAKE CITY, UT 84122-1195
PO BOX 221196, SALT LAKE CITY, UT 84122-1196
PO BOX 221197, SALT LAKE CITY, UT 84122-1197
PO BOX 221198, SALT LAKE CITY, UT 84122-1198
PO BOX 221199, SALT LAKE CITY, UT 84122-1199
PO BOX 221200, SALT LAKE CITY, UT 84122-1200
PO BOX 221201, SALT LAKE CITY, UT 84122-1201
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