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 1961, ROCKINGHAM, NC 28380-1961
PO BOX 1962, ROCKINGHAM, NC 28380-1962
PO BOX 1963, ROCKINGHAM, NC 28380-1963
PO BOX 1964, ROCKINGHAM, NC 28380-1964
PO BOX 1965, ROCKINGHAM, NC 28380-1965
PO BOX 1966, ROCKINGHAM, NC 28380-1966
PO BOX 1967, ROCKINGHAM, NC 28380-1967
PO BOX 1968, ROCKINGHAM, NC 28380-1968
PO BOX 1969, ROCKINGHAM, NC 28380-1969
PO BOX 1970, ROCKINGHAM, NC 28380-1970
PO BOX 1971, ROCKINGHAM, NC 28380-1971
PO BOX 1972, ROCKINGHAM, NC 28380-1972
PO BOX 1973, ROCKINGHAM, NC 28380-1973
PO BOX 1974, ROCKINGHAM, NC 28380-1974
PO BOX 1975, ROCKINGHAM, NC 28380-1975
PO BOX 1976, ROCKINGHAM, NC 28380-1976
PO BOX 1977, ROCKINGHAM, NC 28380-1977
PO BOX 1978, ROCKINGHAM, NC 28380-1978
PO BOX 1979, ROCKINGHAM, NC 28380-1979
PO BOX 1980, ROCKINGHAM, NC 28380-1980
PO BOX 1981, ROCKINGHAM, NC 28380-1981
PO BOX 1982, ROCKINGHAM, NC 28380-1982
PO BOX 1983, ROCKINGHAM, NC 28380-1983
PO BOX 1984, ROCKINGHAM, NC 28380-1984
PO BOX 1985, ROCKINGHAM, NC 28380-1985
PO BOX 1986, ROCKINGHAM, NC 28380-1986
PO BOX 1987, ROCKINGHAM, NC 28380-1987
PO BOX 1988, ROCKINGHAM, NC 28380-1988
PO BOX 1989, ROCKINGHAM, NC 28380-1989
PO BOX 1990, ROCKINGHAM, NC 28380-1990
PO BOX 1991, ROCKINGHAM, NC 28380-1991
PO BOX 1992, ROCKINGHAM, NC 28380-1992
PO BOX 1993, ROCKINGHAM, NC 28380-1993
PO BOX 1994, ROCKINGHAM, NC 28380-1994
PO BOX 1995, ROCKINGHAM, NC 28380-1995
PO BOX 1996, ROCKINGHAM, NC 28380-1996
PO BOX 1997, ROCKINGHAM, NC 28380-1997
PO BOX 1998, ROCKINGHAM, NC 28380-1998
PO BOX 1999, ROCKINGHAM, NC 28380-1999
PO BOX 2000, ROCKINGHAM, NC 28380-2000
PO BOX 2001, ROCKINGHAM, NC 28380-2001
PO BOX 2002, ROCKINGHAM, NC 28380-2002
PO BOX 2003, ROCKINGHAM, NC 28380-2003
PO BOX 2004, ROCKINGHAM, NC 28380-2004
PO BOX 2005, ROCKINGHAM, NC 28380-2005
PO BOX 2006, ROCKINGHAM, NC 28380-2006
PO BOX 2007, ROCKINGHAM, NC 28380-2007
PO BOX 2008, ROCKINGHAM, NC 28380-2008
PO BOX 2009, ROCKINGHAM, NC 28380-2009
PO BOX 2010, ROCKINGHAM, NC 28380-2010
PO BOX 2011, ROCKINGHAM, NC 28380-2011
PO BOX 2012, ROCKINGHAM, NC 28380-2012
PO BOX 2013, ROCKINGHAM, NC 28380-2013
PO BOX 2014, ROCKINGHAM, NC 28380-2014
PO BOX 2015, ROCKINGHAM, NC 28380-2015
PO BOX 2016, ROCKINGHAM, NC 28380-2016
PO BOX 2017, ROCKINGHAM, NC 28380-2017
PO BOX 2018, ROCKINGHAM, NC 28380-2018
PO BOX 2019, ROCKINGHAM, NC 28380-2019
PO BOX 2020, ROCKINGHAM, NC 28380-2020
PO BOX 2021, ROCKINGHAM, NC 28380-2021
PO BOX 2022, ROCKINGHAM, NC 28380-2022
PO BOX 2023, ROCKINGHAM, NC 28380-2023
PO BOX 2024, ROCKINGHAM, NC 28380-2024
PO BOX 2025, ROCKINGHAM, NC 28380-2025
PO BOX 2026, ROCKINGHAM, NC 28380-2026
PO BOX 2027, ROCKINGHAM, NC 28380-2027
PO BOX 2028, ROCKINGHAM, NC 28380-2028
PO BOX 2029, ROCKINGHAM, NC 28380-2029
PO BOX 2030, ROCKINGHAM, NC 28380-2030
PO BOX 2031, ROCKINGHAM, NC 28380-2031
PO BOX 2032, ROCKINGHAM, NC 28380-2032
PO BOX 2033, ROCKINGHAM, NC 28380-2033
PO BOX 2034, ROCKINGHAM, NC 28380-2034
PO BOX 2035, ROCKINGHAM, NC 28380-2035
PO BOX 2036, ROCKINGHAM, NC 28380-2036
PO BOX 2037, ROCKINGHAM, NC 28380-2037
PO BOX 2038, ROCKINGHAM, NC 28380-2038
PO BOX 2039, ROCKINGHAM, NC 28380-2039
PO BOX 2040, ROCKINGHAM, NC 28380-2040
PO BOX 2041, ROCKINGHAM, NC 28380-2041
PO BOX 2042, ROCKINGHAM, NC 28380-2042
PO BOX 2043, ROCKINGHAM, NC 28380-2043
PO BOX 2044, ROCKINGHAM, NC 28380-2044
PO BOX 2045, ROCKINGHAM, NC 28380-2045
PO BOX 2046, ROCKINGHAM, NC 28380-2046
PO BOX 2047, ROCKINGHAM, NC 28380-2047
PO BOX 2048, ROCKINGHAM, NC 28380-2048
PO BOX 2049, ROCKINGHAM, NC 28380-2049
PO BOX 2050, ROCKINGHAM, NC 28380-2050
PO BOX 2051, ROCKINGHAM, NC 28380-2051
PO BOX 2052, ROCKINGHAM, NC 28380-2052
PO BOX 2053, ROCKINGHAM, NC 28380-2053
PO BOX 2054, ROCKINGHAM, NC 28380-2054
PO BOX 2055, ROCKINGHAM, NC 28380-2055
PO BOX 2056, ROCKINGHAM, NC 28380-2056
PO BOX 2057, ROCKINGHAM, NC 28380-2057
PO BOX 2058, ROCKINGHAM, NC 28380-2058
PO BOX 2059, ROCKINGHAM, NC 28380-2059
PO BOX 2060, ROCKINGHAM, NC 28380-2060
PO BOX 2061, ROCKINGHAM, NC 28380-2061
PO BOX 2062, ROCKINGHAM, NC 28380-2062
PO BOX 2063, ROCKINGHAM, NC 28380-2063
PO BOX 2064, ROCKINGHAM, NC 28380-2064
PO BOX 2065, ROCKINGHAM, NC 28380-2065
PO BOX 2066, ROCKINGHAM, NC 28380-2066
PO BOX 2067, ROCKINGHAM, NC 28380-2067
PO BOX 2068, ROCKINGHAM, NC 28380-2068
PO BOX 2069, ROCKINGHAM, NC 28380-2069
PO BOX 2070, ROCKINGHAM, NC 28380-2070
PO BOX 2071, ROCKINGHAM, NC 28380-2071
PO BOX 2072, ROCKINGHAM, NC 28380-2072
PO BOX 2073, ROCKINGHAM, NC 28380-2073
PO BOX 2074, ROCKINGHAM, NC 28380-2074
PO BOX 2075, ROCKINGHAM, NC 28380-2075
PO BOX 2076, ROCKINGHAM, NC 28380-2076
PO BOX 2077, ROCKINGHAM, NC 28380-2077
PO BOX 2078, ROCKINGHAM, NC 28380-2078
PO BOX 2079, ROCKINGHAM, NC 28380-2079
PO BOX 2080, ROCKINGHAM, NC 28380-2080
PO BOX 2081, ROCKINGHAM, NC 28380-2081
PO BOX 2082, ROCKINGHAM, NC 28380-2082
PO BOX 2083, ROCKINGHAM, NC 28380-2083
PO BOX 2084, ROCKINGHAM, NC 28380-2084
PO BOX 2085, ROCKINGHAM, NC 28380-2085
PO BOX 2086, ROCKINGHAM, NC 28380-2086
PO BOX 2087, ROCKINGHAM, NC 28380-2087
PO BOX 2088, ROCKINGHAM, NC 28380-2088
PO BOX 2089, ROCKINGHAM, NC 28380-2089
PO BOX 2090, ROCKINGHAM, NC 28380-2090
PO BOX 2091, ROCKINGHAM, NC 28380-2091
PO BOX 2092, ROCKINGHAM, NC 28380-2092
PO BOX 2093, ROCKINGHAM, NC 28380-2093
PO BOX 2094, ROCKINGHAM, NC 28380-2094
PO BOX 2095, ROCKINGHAM, NC 28380-2095
PO BOX 2096, ROCKINGHAM, NC 28380-2096
PO BOX 2097, ROCKINGHAM, NC 28380-2097
PO BOX 2098, ROCKINGHAM, NC 28380-2098
PO BOX 2099, ROCKINGHAM, NC 28380-2099
PO BOX 2100, ROCKINGHAM, NC 28380-2100
PO BOX 2101, ROCKINGHAM, NC 28380-2101
PO BOX 2102, ROCKINGHAM, NC 28380-2102
PO BOX 2103, ROCKINGHAM, NC 28380-2103
PO BOX 2104, ROCKINGHAM, NC 28380-2104
PO BOX 2105, ROCKINGHAM, NC 28380-2105
PO BOX 2106, ROCKINGHAM, NC 28380-2106
PO BOX 2107, ROCKINGHAM, NC 28380-2107
PO BOX 2108, ROCKINGHAM, NC 28380-2108
PO BOX 2109, ROCKINGHAM, NC 28380-2109
PO BOX 2110, ROCKINGHAM, NC 28380-2110
PO BOX 2111, ROCKINGHAM, NC 28380-2111
PO BOX 2112, ROCKINGHAM, NC 28380-2112
PO BOX 2113, ROCKINGHAM, NC 28380-2113
PO BOX 2114, ROCKINGHAM, NC 28380-2114
PO BOX 2115, ROCKINGHAM, NC 28380-2115
PO BOX 2116, ROCKINGHAM, NC 28380-2116
PO BOX 2117, ROCKINGHAM, NC 28380-2117
PO BOX 2118, ROCKINGHAM, NC 28380-2118
PO BOX 2119, ROCKINGHAM, NC 28380-2119
PO BOX 2120, ROCKINGHAM, NC 28380-2120
PO BOX 2121, ROCKINGHAM, NC 28380-2121
PO BOX 2122, ROCKINGHAM, NC 28380-2122
PO BOX 2123, ROCKINGHAM, NC 28380-2123
PO BOX 2124, ROCKINGHAM, NC 28380-2124
PO BOX 2125, ROCKINGHAM, NC 28380-2125
PO BOX 2126, ROCKINGHAM, NC 28380-2126
PO BOX 2127, ROCKINGHAM, NC 28380-2127
PO BOX 2128, ROCKINGHAM, NC 28380-2128
PO BOX 2129, ROCKINGHAM, NC 28380-2129
PO BOX 2130, ROCKINGHAM, NC 28380-2130
PO BOX 2131, ROCKINGHAM, NC 28380-2131
PO BOX 2132, ROCKINGHAM, NC 28380-2132
PO BOX 2133, ROCKINGHAM, NC 28380-2133
PO BOX 2134, ROCKINGHAM, NC 28380-2134
PO BOX 2135, ROCKINGHAM, NC 28380-2135
PO BOX 2136, ROCKINGHAM, NC 28380-2136
PO BOX 2137, ROCKINGHAM, NC 28380-2137
PO BOX 2138, ROCKINGHAM, NC 28380-2138
PO BOX 2139, ROCKINGHAM, NC 28380-2139
PO BOX 2140, ROCKINGHAM, NC 28380-2140
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