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, STAMFORD, CT 06904-0981
PO BOX 982, STAMFORD, CT 06904-0982
PO BOX 983, STAMFORD, CT 06904-0983
PO BOX 984, STAMFORD, CT 06904-0984
PO BOX 985, STAMFORD, CT 06904-0985
PO BOX 986, STAMFORD, CT 06904-0986
PO BOX 987, STAMFORD, CT 06904-0987
PO BOX 988, STAMFORD, CT 06904-0988
PO BOX 989, STAMFORD, CT 06904-0989
PO BOX 990, STAMFORD, CT 06904-0990
PO BOX 991, STAMFORD, CT 06904-0991
PO BOX 992, STAMFORD, CT 06904-0992
PO BOX 993, STAMFORD, CT 06904-0993
PO BOX 994, STAMFORD, CT 06904-0994
PO BOX 995, STAMFORD, CT 06904-0995
PO BOX 996, STAMFORD, CT 06904-0996
PO BOX 997, STAMFORD, CT 06904-0997
PO BOX 998, STAMFORD, CT 06904-0998
PO BOX 999, STAMFORD, CT 06904-0999
PO BOX 1000, STAMFORD, CT 06904-1000
PO BOX 1001, STAMFORD, CT 06904-1001
PO BOX 1002, STAMFORD, CT 06904-1002
PO BOX 1003, STAMFORD, CT 06904-1003
PO BOX 1004, STAMFORD, CT 06904-1004
PO BOX 1005, STAMFORD, CT 06904-1005
PO BOX 1006, STAMFORD, CT 06904-1006
PO BOX 1007, STAMFORD, CT 06904-1007
PO BOX 1008, STAMFORD, CT 06904-1008
PO BOX 1009, STAMFORD, CT 06904-1009
PO BOX 1010, STAMFORD, CT 06904-1010
PO BOX 1011, STAMFORD, CT 06904-1011
PO BOX 1012, STAMFORD, CT 06904-1012
PO BOX 1013, STAMFORD, CT 06904-1013
PO BOX 1014, STAMFORD, CT 06904-1014
PO BOX 1015, STAMFORD, CT 06904-1015
PO BOX 1016, STAMFORD, CT 06904-1016
PO BOX 1017, STAMFORD, CT 06904-1017
PO BOX 1018, STAMFORD, CT 06904-1018
PO BOX 1019, STAMFORD, CT 06904-1019
PO BOX 1020, STAMFORD, CT 06904-1020
PO BOX 1021, STAMFORD, CT 06904-1021
PO BOX 1022, STAMFORD, CT 06904-1022
PO BOX 1023, STAMFORD, CT 06904-1023
PO BOX 1024, STAMFORD, CT 06904-1024
PO BOX 1025, STAMFORD, CT 06904-1025
PO BOX 1026, STAMFORD, CT 06904-1026
PO BOX 1027, STAMFORD, CT 06904-1027
PO BOX 1028, STAMFORD, CT 06904-1028
PO BOX 1029, STAMFORD, CT 06904-1029
PO BOX 1030, STAMFORD, CT 06904-1030
PO BOX 1031, STAMFORD, CT 06904-1031
PO BOX 1032, STAMFORD, CT 06904-1032
PO BOX 1033, STAMFORD, CT 06904-1033
PO BOX 1034, STAMFORD, CT 06904-1034
PO BOX 1035, STAMFORD, CT 06904-1035
PO BOX 1036, STAMFORD, CT 06904-1036
PO BOX 1037, STAMFORD, CT 06904-1037
PO BOX 1038, STAMFORD, CT 06904-1038
PO BOX 1039, STAMFORD, CT 06904-1039
PO BOX 1040, STAMFORD, CT 06904-1040
PO BOX 1041, STAMFORD, CT 06904-1041
PO BOX 1042, STAMFORD, CT 06904-1042
PO BOX 1043, STAMFORD, CT 06904-1043
PO BOX 1044, STAMFORD, CT 06904-1044
PO BOX 1045, STAMFORD, CT 06904-1045
PO BOX 1046, STAMFORD, CT 06904-1046
PO BOX 1047, STAMFORD, CT 06904-1047
PO BOX 1048, STAMFORD, CT 06904-1048
PO BOX 1049, STAMFORD, CT 06904-1049
PO BOX 1050, STAMFORD, CT 06904-1050
PO BOX 1051, STAMFORD, CT 06904-1051
PO BOX 1052, STAMFORD, CT 06904-1052
PO BOX 1053, STAMFORD, CT 06904-1053
PO BOX 1054, STAMFORD, CT 06904-1054
PO BOX 1055, STAMFORD, CT 06904-1055
PO BOX 1056, STAMFORD, CT 06904-1056
PO BOX 1057, STAMFORD, CT 06904-1057
PO BOX 1058, STAMFORD, CT 06904-1058
PO BOX 1059, STAMFORD, CT 06904-1059
PO BOX 1060, STAMFORD, CT 06904-1060
PO BOX 1061, STAMFORD, CT 06904-1061
PO BOX 1062, STAMFORD, CT 06904-1062
PO BOX 1063, STAMFORD, CT 06904-1063
PO BOX 1064, STAMFORD, CT 06904-1064
PO BOX 1065, STAMFORD, CT 06904-1065
PO BOX 1066, STAMFORD, CT 06904-1066
PO BOX 1067, STAMFORD, CT 06904-1067
PO BOX 1068, STAMFORD, CT 06904-1068
PO BOX 1069, STAMFORD, CT 06904-1069
PO BOX 1070, STAMFORD, CT 06904-1070
PO BOX 1071, STAMFORD, CT 06904-1071
PO BOX 1072, STAMFORD, CT 06904-1072
PO BOX 1073, STAMFORD, CT 06904-1073
PO BOX 1074, STAMFORD, CT 06904-1074
PO BOX 1075, STAMFORD, CT 06904-1075
PO BOX 1076, STAMFORD, CT 06904-1076
PO BOX 1077, STAMFORD, CT 06904-1077
PO BOX 1078, STAMFORD, CT 06904-1078
PO BOX 1079, STAMFORD, CT 06904-1079
PO BOX 1080, STAMFORD, CT 06904-1080
PO BOX 1081, STAMFORD, CT 06904-1081
PO BOX 1082, STAMFORD, CT 06904-1082
PO BOX 1083, STAMFORD, CT 06904-1083
PO BOX 1084, STAMFORD, CT 06904-1084
PO BOX 1085, STAMFORD, CT 06904-1085
PO BOX 1086, STAMFORD, CT 06904-1086
PO BOX 1087, STAMFORD, CT 06904-1087
PO BOX 1088, STAMFORD, CT 06904-1088
PO BOX 1089, STAMFORD, CT 06904-1089
PO BOX 1090, STAMFORD, CT 06904-1090
PO BOX 1091, STAMFORD, CT 06904-1091
PO BOX 1092, STAMFORD, CT 06904-1092
PO BOX 1093, STAMFORD, CT 06904-1093
PO BOX 1094, STAMFORD, CT 06904-1094
PO BOX 1095, STAMFORD, CT 06904-1095
PO BOX 1096, STAMFORD, CT 06904-1096
PO BOX 1097, STAMFORD, CT 06904-1097
PO BOX 1098, STAMFORD, CT 06904-1098
PO BOX 1099, STAMFORD, CT 06904-1099
PO BOX 1100, STAMFORD, CT 06904-1100
PO BOX 1101, STAMFORD, CT 06904-1101
PO BOX 1102, STAMFORD, CT 06904-1102
PO BOX 1103, STAMFORD, CT 06904-1103
PO BOX 1104, STAMFORD, CT 06904-1104
PO BOX 1105, STAMFORD, CT 06904-1105
PO BOX 1106, STAMFORD, CT 06904-1106
PO BOX 1107, STAMFORD, CT 06904-1107
PO BOX 1108, STAMFORD, CT 06904-1108
PO BOX 1109, STAMFORD, CT 06904-1109
PO BOX 1110, STAMFORD, CT 06904-1110
PO BOX 1111, STAMFORD, CT 06904-1111
PO BOX 1112, STAMFORD, CT 06904-1112
PO BOX 1113, STAMFORD, CT 06904-1113
PO BOX 1114, STAMFORD, CT 06904-1114
PO BOX 1115, STAMFORD, CT 06904-1115
PO BOX 1116, STAMFORD, CT 06904-1116
PO BOX 1117, STAMFORD, CT 06904-1117
PO BOX 1118, STAMFORD, CT 06904-1118
PO BOX 1119, STAMFORD, CT 06904-1119
PO BOX 1120, STAMFORD, CT 06904-1120
PO BOX 1121, STAMFORD, CT 06904-1121
PO BOX 1122, STAMFORD, CT 06904-1122
PO BOX 1123, STAMFORD, CT 06904-1123
PO BOX 1124, STAMFORD, CT 06904-1124
PO BOX 1125, STAMFORD, CT 06904-1125
PO BOX 1126, STAMFORD, CT 06904-1126
PO BOX 1127, STAMFORD, CT 06904-1127
PO BOX 1128, STAMFORD, CT 06904-1128
PO BOX 1129, STAMFORD, CT 06904-1129
PO BOX 1130, STAMFORD, CT 06904-1130
PO BOX 1131, STAMFORD, CT 06904-1131
PO BOX 1132, STAMFORD, CT 06904-1132
PO BOX 1133, STAMFORD, CT 06904-1133
PO BOX 1134, STAMFORD, CT 06904-1134
PO BOX 1135, STAMFORD, CT 06904-1135
PO BOX 1136, STAMFORD, CT 06904-1136
PO BOX 1137, STAMFORD, CT 06904-1137
PO BOX 1138, STAMFORD, CT 06904-1138
PO BOX 1139, STAMFORD, CT 06904-1139
PO BOX 1140, STAMFORD, CT 06904-1140
PO BOX 1141, STAMFORD, CT 06904-1141
PO BOX 1142, STAMFORD, CT 06904-1142
PO BOX 1143, STAMFORD, CT 06904-1143
PO BOX 1144, STAMFORD, CT 06904-1144
PO BOX 1145, STAMFORD, CT 06904-1145
PO BOX 1146, STAMFORD, CT 06904-1146
PO BOX 1147, STAMFORD, CT 06904-1147
PO BOX 1148, STAMFORD, CT 06904-1148
PO BOX 1149, STAMFORD, CT 06904-1149
PO BOX 1150, STAMFORD, CT 06904-1150
PO BOX 1151, STAMFORD, CT 06904-1151
PO BOX 1152, STAMFORD, CT 06904-1152
PO BOX 1153, STAMFORD, CT 06904-1153
PO BOX 1154, STAMFORD, CT 06904-1154
PO BOX 1155, STAMFORD, CT 06904-1155
PO BOX 1156, STAMFORD, CT 06904-1156
PO BOX 1157, STAMFORD, CT 06904-1157
PO BOX 1158, STAMFORD, CT 06904-1158
PO BOX 1159, STAMFORD, CT 06904-1159
PO BOX 1160, STAMFORD, CT 06904-1160
PO BOX 1161, STAMFORD, CT 06904-1161
PO BOX 1162, STAMFORD, CT 06904-1162
PO BOX 1163, STAMFORD, CT 06904-1163
PO BOX 1164, STAMFORD, CT 06904-1164
PO BOX 1165, STAMFORD, CT 06904-1165
PO BOX 1166, STAMFORD, CT 06904-1166
PO BOX 1167, STAMFORD, CT 06904-1167
PO BOX 1168, STAMFORD, CT 06904-1168
PO BOX 1169, STAMFORD, CT 06904-1169
PO BOX 1170, STAMFORD, CT 06904-1170
PO BOX 1171, STAMFORD, CT 06904-1171
PO BOX 1172, STAMFORD, CT 06904-1172
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