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 961, ROCKINGHAM, NC 28380-0961
PO BOX 962, ROCKINGHAM, NC 28380-0962
PO BOX 963, ROCKINGHAM, NC 28380-0963
PO BOX 964, ROCKINGHAM, NC 28380-0964
PO BOX 965, ROCKINGHAM, NC 28380-0965
PO BOX 966, ROCKINGHAM, NC 28380-0966
PO BOX 967, ROCKINGHAM, NC 28380-0967
PO BOX 968, ROCKINGHAM, NC 28380-0968
PO BOX 969, ROCKINGHAM, NC 28380-0969
PO BOX 970, ROCKINGHAM, NC 28380-0970
PO BOX 971, ROCKINGHAM, NC 28380-0971
PO BOX 972, ROCKINGHAM, NC 28380-0972
PO BOX 973, ROCKINGHAM, NC 28380-0973
PO BOX 974, ROCKINGHAM, NC 28380-0974
PO BOX 975, ROCKINGHAM, NC 28380-0975
PO BOX 976, ROCKINGHAM, NC 28380-0976
PO BOX 977, ROCKINGHAM, NC 28380-0977
PO BOX 978, ROCKINGHAM, NC 28380-0978
PO BOX 979, ROCKINGHAM, NC 28380-0979
PO BOX 980, ROCKINGHAM, NC 28380-0980
PO BOX 981, ROCKINGHAM, NC 28380-0981
PO BOX 982, ROCKINGHAM, NC 28380-0982
PO BOX 983, ROCKINGHAM, NC 28380-0983
PO BOX 984, ROCKINGHAM, NC 28380-0984
PO BOX 985, ROCKINGHAM, NC 28380-0985
PO BOX 986, ROCKINGHAM, NC 28380-0986
PO BOX 987, ROCKINGHAM, NC 28380-0987
PO BOX 988, ROCKINGHAM, NC 28380-0988
PO BOX 989, ROCKINGHAM, NC 28380-0989
PO BOX 990, ROCKINGHAM, NC 28380-0990
PO BOX 991, ROCKINGHAM, NC 28380-0991
PO BOX 992, ROCKINGHAM, NC 28380-0992
PO BOX 993, ROCKINGHAM, NC 28380-0993
PO BOX 994, ROCKINGHAM, NC 28380-0994
PO BOX 995, ROCKINGHAM, NC 28380-0995
PO BOX 996, ROCKINGHAM, NC 28380-0996
PO BOX 997, ROCKINGHAM, NC 28380-0997
PO BOX 998, ROCKINGHAM, NC 28380-0998
PO BOX 999, ROCKINGHAM, NC 28380-0999
PO BOX 1000, ROCKINGHAM, NC 28380-1000
PO BOX 1001, ROCKINGHAM, NC 28380-1001
PO BOX 1002, ROCKINGHAM, NC 28380-1002
PO BOX 1003, ROCKINGHAM, NC 28380-1003
PO BOX 1004, ROCKINGHAM, NC 28380-1004
PO BOX 1005, ROCKINGHAM, NC 28380-1005
PO BOX 1006, ROCKINGHAM, NC 28380-1006
PO BOX 1007, ROCKINGHAM, NC 28380-1007
PO BOX 1008, ROCKINGHAM, NC 28380-1008
PO BOX 1009, ROCKINGHAM, NC 28380-1009
PO BOX 1010, ROCKINGHAM, NC 28380-1010
PO BOX 1011, ROCKINGHAM, NC 28380-1011
PO BOX 1012, ROCKINGHAM, NC 28380-1012
PO BOX 1013, ROCKINGHAM, NC 28380-1013
PO BOX 1014, ROCKINGHAM, NC 28380-1014
PO BOX 1015, ROCKINGHAM, NC 28380-1015
PO BOX 1016, ROCKINGHAM, NC 28380-1016
PO BOX 1017, ROCKINGHAM, NC 28380-1017
PO BOX 1018, ROCKINGHAM, NC 28380-1018
PO BOX 1019, ROCKINGHAM, NC 28380-1019
PO BOX 1020, ROCKINGHAM, NC 28380-1020
PO BOX 1021, ROCKINGHAM, NC 28380-1021
PO BOX 1022, ROCKINGHAM, NC 28380-1022
PO BOX 1023, ROCKINGHAM, NC 28380-1023
PO BOX 1024, ROCKINGHAM, NC 28380-1024
PO BOX 1025, ROCKINGHAM, NC 28380-1025
PO BOX 1026, ROCKINGHAM, NC 28380-1026
PO BOX 1027, ROCKINGHAM, NC 28380-1027
PO BOX 1028, ROCKINGHAM, NC 28380-1028
PO BOX 1029, ROCKINGHAM, NC 28380-1029
PO BOX 1030, ROCKINGHAM, NC 28380-1030
PO BOX 1031, ROCKINGHAM, NC 28380-1031
PO BOX 1032, ROCKINGHAM, NC 28380-1032
PO BOX 1033, ROCKINGHAM, NC 28380-1033
PO BOX 1034, ROCKINGHAM, NC 28380-1034
PO BOX 1035, ROCKINGHAM, NC 28380-1035
PO BOX 1036, ROCKINGHAM, NC 28380-1036
PO BOX 1037, ROCKINGHAM, NC 28380-1037
PO BOX 1038, ROCKINGHAM, NC 28380-1038
PO BOX 1039, ROCKINGHAM, NC 28380-1039
PO BOX 1040, ROCKINGHAM, NC 28380-1040
PO BOX 1041, ROCKINGHAM, NC 28380-1041
PO BOX 1042, ROCKINGHAM, NC 28380-1042
PO BOX 1043, ROCKINGHAM, NC 28380-1043
PO BOX 1044, ROCKINGHAM, NC 28380-1044
PO BOX 1045, ROCKINGHAM, NC 28380-1045
PO BOX 1046, ROCKINGHAM, NC 28380-1046
PO BOX 1047, ROCKINGHAM, NC 28380-1047
PO BOX 1048, ROCKINGHAM, NC 28380-1048
PO BOX 1049, ROCKINGHAM, NC 28380-1049
PO BOX 1050, ROCKINGHAM, NC 28380-1050
PO BOX 1051, ROCKINGHAM, NC 28380-1051
PO BOX 1052, ROCKINGHAM, NC 28380-1052
PO BOX 1053, ROCKINGHAM, NC 28380-1053
PO BOX 1054, ROCKINGHAM, NC 28380-1054
PO BOX 1055, ROCKINGHAM, NC 28380-1055
PO BOX 1056, ROCKINGHAM, NC 28380-1056
PO BOX 1057, ROCKINGHAM, NC 28380-1057
PO BOX 1058, ROCKINGHAM, NC 28380-1058
PO BOX 1059, ROCKINGHAM, NC 28380-1059
PO BOX 1060, ROCKINGHAM, NC 28380-1060
PO BOX 1061, ROCKINGHAM, NC 28380-1061
PO BOX 1062, ROCKINGHAM, NC 28380-1062
PO BOX 1063, ROCKINGHAM, NC 28380-1063
PO BOX 1064, ROCKINGHAM, NC 28380-1064
PO BOX 1065, ROCKINGHAM, NC 28380-1065
PO BOX 1066, ROCKINGHAM, NC 28380-1066
PO BOX 1067, ROCKINGHAM, NC 28380-1067
PO BOX 1068, ROCKINGHAM, NC 28380-1068
PO BOX 1069, ROCKINGHAM, NC 28380-1069
PO BOX 1070, ROCKINGHAM, NC 28380-1070
PO BOX 1071, ROCKINGHAM, NC 28380-1071
PO BOX 1072, ROCKINGHAM, NC 28380-1072
PO BOX 1073, ROCKINGHAM, NC 28380-1073
PO BOX 1074, ROCKINGHAM, NC 28380-1074
PO BOX 1075, ROCKINGHAM, NC 28380-1075
PO BOX 1076, ROCKINGHAM, NC 28380-1076
PO BOX 1077, ROCKINGHAM, NC 28380-1077
PO BOX 1078, ROCKINGHAM, NC 28380-1078
PO BOX 1079, ROCKINGHAM, NC 28380-1079
PO BOX 1080, ROCKINGHAM, NC 28380-1080
PO BOX 1081, ROCKINGHAM, NC 28380-1081
PO BOX 1082, ROCKINGHAM, NC 28380-1082
PO BOX 1083, ROCKINGHAM, NC 28380-1083
PO BOX 1084, ROCKINGHAM, NC 28380-1084
PO BOX 1085, ROCKINGHAM, NC 28380-1085
PO BOX 1086, ROCKINGHAM, NC 28380-1086
PO BOX 1087, ROCKINGHAM, NC 28380-1087
PO BOX 1088, ROCKINGHAM, NC 28380-1088
PO BOX 1089, ROCKINGHAM, NC 28380-1089
PO BOX 1090, ROCKINGHAM, NC 28380-1090
PO BOX 1091, ROCKINGHAM, NC 28380-1091
PO BOX 1092, ROCKINGHAM, NC 28380-1092
PO BOX 1093, ROCKINGHAM, NC 28380-1093
PO BOX 1094, ROCKINGHAM, NC 28380-1094
PO BOX 1095, ROCKINGHAM, NC 28380-1095
PO BOX 1096, ROCKINGHAM, NC 28380-1096
PO BOX 1097, ROCKINGHAM, NC 28380-1097
PO BOX 1098, ROCKINGHAM, NC 28380-1098
PO BOX 1099, ROCKINGHAM, NC 28380-1099
PO BOX 1100, ROCKINGHAM, NC 28380-1100
PO BOX 1101, ROCKINGHAM, NC 28380-1101
PO BOX 1102, ROCKINGHAM, NC 28380-1102
PO BOX 1103, ROCKINGHAM, NC 28380-1103
PO BOX 1104, ROCKINGHAM, NC 28380-1104
PO BOX 1105, ROCKINGHAM, NC 28380-1105
PO BOX 1106, ROCKINGHAM, NC 28380-1106
PO BOX 1107, ROCKINGHAM, NC 28380-1107
PO BOX 1108, ROCKINGHAM, NC 28380-1108
PO BOX 1109, ROCKINGHAM, NC 28380-1109
PO BOX 1110, ROCKINGHAM, NC 28380-1110
PO BOX 1111, ROCKINGHAM, NC 28380-1111
PO BOX 1112, ROCKINGHAM, NC 28380-1112
PO BOX 1113, ROCKINGHAM, NC 28380-1113
PO BOX 1114, ROCKINGHAM, NC 28380-1114
PO BOX 1115, ROCKINGHAM, NC 28380-1115
PO BOX 1116, ROCKINGHAM, NC 28380-1116
PO BOX 1117, ROCKINGHAM, NC 28380-1117
PO BOX 1118, ROCKINGHAM, NC 28380-1118
PO BOX 1119, ROCKINGHAM, NC 28380-1119
PO BOX 1120, ROCKINGHAM, NC 28380-1120
PO BOX 1121, ROCKINGHAM, NC 28380-1121
PO BOX 1122, ROCKINGHAM, NC 28380-1122
PO BOX 1123, ROCKINGHAM, NC 28380-1123
PO BOX 1124, ROCKINGHAM, NC 28380-1124
PO BOX 1125, ROCKINGHAM, NC 28380-1125
PO BOX 1126, ROCKINGHAM, NC 28380-1126
PO BOX 1127, ROCKINGHAM, NC 28380-1127
PO BOX 1128, ROCKINGHAM, NC 28380-1128
PO BOX 1129, ROCKINGHAM, NC 28380-1129
PO BOX 1130, ROCKINGHAM, NC 28380-1130
PO BOX 1131, ROCKINGHAM, NC 28380-1131
PO BOX 1132, ROCKINGHAM, NC 28380-1132
PO BOX 1133, ROCKINGHAM, NC 28380-1133
PO BOX 1134, ROCKINGHAM, NC 28380-1134
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