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 981, MASON CITY, IA 50402-0981
PO BOX 982, MASON CITY, IA 50402-0982
PO BOX 983, MASON CITY, IA 50402-0983
PO BOX 984, MASON CITY, IA 50402-0984
PO BOX 985, MASON CITY, IA 50402-0985
PO BOX 986, MASON CITY, IA 50402-0986
PO BOX 987, MASON CITY, IA 50402-0987
PO BOX 988, MASON CITY, IA 50402-0988
PO BOX 989, MASON CITY, IA 50402-0989
PO BOX 990, MASON CITY, IA 50402-0990
PO BOX 991, MASON CITY, IA 50402-0991
PO BOX 992, MASON CITY, IA 50402-0992
PO BOX 993, MASON CITY, IA 50402-0993
PO BOX 994, MASON CITY, IA 50402-0994
PO BOX 995, MASON CITY, IA 50402-0995
PO BOX 996, MASON CITY, IA 50402-0996
PO BOX 997, MASON CITY, IA 50402-0997
PO BOX 998, MASON CITY, IA 50402-0998
PO BOX 999, MASON CITY, IA 50402-0999
PO BOX 1000, MASON CITY, IA 50402-1000
PO BOX 1001, MASON CITY, IA 50402-1001
PO BOX 1002, MASON CITY, IA 50402-1002
PO BOX 1003, MASON CITY, IA 50402-1003
PO BOX 1004, MASON CITY, IA 50402-1004
PO BOX 1005, MASON CITY, IA 50402-1005
PO BOX 1006, MASON CITY, IA 50402-1006
PO BOX 1007, MASON CITY, IA 50402-1007
PO BOX 1008, MASON CITY, IA 50402-1008
PO BOX 1009, MASON CITY, IA 50402-1009
PO BOX 1010, MASON CITY, IA 50402-1010
PO BOX 1011, MASON CITY, IA 50402-1011
PO BOX 1012, MASON CITY, IA 50402-1012
PO BOX 1013, MASON CITY, IA 50402-1013
PO BOX 1014, MASON CITY, IA 50402-1014
PO BOX 1015, MASON CITY, IA 50402-1015
PO BOX 1016, MASON CITY, IA 50402-1016
PO BOX 1017, MASON CITY, IA 50402-1017
PO BOX 1018, MASON CITY, IA 50402-1018
PO BOX 1019, MASON CITY, IA 50402-1019
PO BOX 1020, MASON CITY, IA 50402-1020
PO BOX 1021, MASON CITY, IA 50402-1021
PO BOX 1022, MASON CITY, IA 50402-1022
PO BOX 1023, MASON CITY, IA 50402-1023
PO BOX 1024, MASON CITY, IA 50402-1024
PO BOX 1025, MASON CITY, IA 50402-1025
PO BOX 1026, MASON CITY, IA 50402-1026
PO BOX 1027, MASON CITY, IA 50402-1027
PO BOX 1028, MASON CITY, IA 50402-1028
PO BOX 1029, MASON CITY, IA 50402-1029
PO BOX 1030, MASON CITY, IA 50402-1030
PO BOX 1031, MASON CITY, IA 50402-1031
PO BOX 1032, MASON CITY, IA 50402-1032
PO BOX 1033, MASON CITY, IA 50402-1033
PO BOX 1034, MASON CITY, IA 50402-1034
PO BOX 1035, MASON CITY, IA 50402-1035
PO BOX 1036, MASON CITY, IA 50402-1036
PO BOX 1037, MASON CITY, IA 50402-1037
PO BOX 1038, MASON CITY, IA 50402-1038
PO BOX 1039, MASON CITY, IA 50402-1039
PO BOX 1040, MASON CITY, IA 50402-1040
PO BOX 1041, MASON CITY, IA 50402-1041
PO BOX 1042, MASON CITY, IA 50402-1042
PO BOX 1043, MASON CITY, IA 50402-1043
PO BOX 1044, MASON CITY, IA 50402-1044
PO BOX 1045, MASON CITY, IA 50402-1045
PO BOX 1046, MASON CITY, IA 50402-1046
PO BOX 1047, MASON CITY, IA 50402-1047
PO BOX 1048, MASON CITY, IA 50402-1048
PO BOX 1049, MASON CITY, IA 50402-1049
PO BOX 1050, MASON CITY, IA 50402-1050
PO BOX 1051, MASON CITY, IA 50402-1051
PO BOX 1052, MASON CITY, IA 50402-1052
PO BOX 1053, MASON CITY, IA 50402-1053
PO BOX 1054, MASON CITY, IA 50402-1054
PO BOX 1055, MASON CITY, IA 50402-1055
PO BOX 1056, MASON CITY, IA 50402-1056
PO BOX 1057, MASON CITY, IA 50402-1057
PO BOX 1058, MASON CITY, IA 50402-1058
PO BOX 1059, MASON CITY, IA 50402-1059
PO BOX 1060, MASON CITY, IA 50402-1060
PO BOX 1061, MASON CITY, IA 50402-1061
PO BOX 1062, MASON CITY, IA 50402-1062
PO BOX 1063, MASON CITY, IA 50402-1063
PO BOX 1064, MASON CITY, IA 50402-1064
PO BOX 1065, MASON CITY, IA 50402-1065
PO BOX 1066, MASON CITY, IA 50402-1066
PO BOX 1067, MASON CITY, IA 50402-1067
PO BOX 1068, MASON CITY, IA 50402-1068
PO BOX 1069, MASON CITY, IA 50402-1069
PO BOX 1070, MASON CITY, IA 50402-1070
PO BOX 1071, MASON CITY, IA 50402-1071
PO BOX 1072, MASON CITY, IA 50402-1072
PO BOX 1073, MASON CITY, IA 50402-1073
PO BOX 1074, MASON CITY, IA 50402-1074
PO BOX 1075, MASON CITY, IA 50402-1075
PO BOX 1076, MASON CITY, IA 50402-1076
PO BOX 1077, MASON CITY, IA 50402-1077
PO BOX 1078, MASON CITY, IA 50402-1078
PO BOX 1079, MASON CITY, IA 50402-1079
PO BOX 1080, MASON CITY, IA 50402-1080
PO BOX 1081, MASON CITY, IA 50402-1081
PO BOX 1082, MASON CITY, IA 50402-1082
PO BOX 1083, MASON CITY, IA 50402-1083
PO BOX 1084, MASON CITY, IA 50402-1084
PO BOX 1085, MASON CITY, IA 50402-1085
PO BOX 1086, MASON CITY, IA 50402-1086
PO BOX 1087, MASON CITY, IA 50402-1087
PO BOX 1088, MASON CITY, IA 50402-1088
PO BOX 1089, MASON CITY, IA 50402-1089
PO BOX 1090, MASON CITY, IA 50402-1090
PO BOX 1091, MASON CITY, IA 50402-1091
PO BOX 1092, MASON CITY, IA 50402-1092
PO BOX 1093, MASON CITY, IA 50402-1093
PO BOX 1094, MASON CITY, IA 50402-1094
PO BOX 1095, MASON CITY, IA 50402-1095
PO BOX 1096, MASON CITY, IA 50402-1096
PO BOX 1097, MASON CITY, IA 50402-1097
PO BOX 1098, MASON CITY, IA 50402-1098
PO BOX 1099, MASON CITY, IA 50402-1099
PO BOX 1100, MASON CITY, IA 50402-1100
PO BOX 1101, MASON CITY, IA 50402-1101
PO BOX 1102, MASON CITY, IA 50402-1102
PO BOX 1103, MASON CITY, IA 50402-1103
PO BOX 1104, MASON CITY, IA 50402-1104
PO BOX 1105, MASON CITY, IA 50402-1105
PO BOX 1106, MASON CITY, IA 50402-1106
PO BOX 1107, MASON CITY, IA 50402-1107
PO BOX 1108, MASON CITY, IA 50402-1108
PO BOX 1109, MASON CITY, IA 50402-1109
PO BOX 1110, MASON CITY, IA 50402-1110
PO BOX 1111, MASON CITY, IA 50402-1111
PO BOX 1112, MASON CITY, IA 50402-1112
PO BOX 1113, MASON CITY, IA 50402-1113
PO BOX 1114, MASON CITY, IA 50402-1114
PO BOX 1115, MASON CITY, IA 50402-1115
PO BOX 1116, MASON CITY, IA 50402-1116
PO BOX 1117, MASON CITY, IA 50402-1117
PO BOX 1118, MASON CITY, IA 50402-1118
PO BOX 1119, MASON CITY, IA 50402-1119
PO BOX 1120, MASON CITY, IA 50402-1120
PO BOX 1121, MASON CITY, IA 50402-1121
PO BOX 1122, MASON CITY, IA 50402-1122
PO BOX 1123, MASON CITY, IA 50402-1123
PO BOX 1124, MASON CITY, IA 50402-1124
PO BOX 1125, MASON CITY, IA 50402-1125
PO BOX 1126, MASON CITY, IA 50402-1126
PO BOX 1127, MASON CITY, IA 50402-1127
PO BOX 1128, MASON CITY, IA 50402-1128
PO BOX 1129, MASON CITY, IA 50402-1129
Add new comment