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 1921, SIOUX FALLS, SD 57101-1921
PO BOX 1922, SIOUX FALLS, SD 57101-1922
PO BOX 1923, SIOUX FALLS, SD 57101-1923
PO BOX 1924, SIOUX FALLS, SD 57101-1924
PO BOX 1925, SIOUX FALLS, SD 57101-1925
PO BOX 1926, SIOUX FALLS, SD 57101-1926
PO BOX 1927, SIOUX FALLS, SD 57101-1927
PO BOX 1928, SIOUX FALLS, SD 57101-1928
PO BOX 1929, SIOUX FALLS, SD 57101-1929
PO BOX 1930, SIOUX FALLS, SD 57101-1930
PO BOX 1931, SIOUX FALLS, SD 57101-1931
PO BOX 1932, SIOUX FALLS, SD 57101-1932
PO BOX 1933, SIOUX FALLS, SD 57101-1933
PO BOX 1934, SIOUX FALLS, SD 57101-1934
PO BOX 1935, SIOUX FALLS, SD 57101-1935
PO BOX 1936, SIOUX FALLS, SD 57101-1936
PO BOX 1937, SIOUX FALLS, SD 57101-1937
PO BOX 1938, SIOUX FALLS, SD 57101-1938
PO BOX 1939, SIOUX FALLS, SD 57101-1939
PO BOX 1940, SIOUX FALLS, SD 57101-1940
PO BOX 1941, SIOUX FALLS, SD 57101-1941
PO BOX 1942, SIOUX FALLS, SD 57101-1942
PO BOX 1943, SIOUX FALLS, SD 57101-1943
PO BOX 1944, SIOUX FALLS, SD 57101-1944
PO BOX 1945, SIOUX FALLS, SD 57101-1945
PO BOX 1946, SIOUX FALLS, SD 57101-1946
PO BOX 1947, SIOUX FALLS, SD 57101-1947
PO BOX 1948, SIOUX FALLS, SD 57101-1948
PO BOX 1949, SIOUX FALLS, SD 57101-1949
PO BOX 1950, SIOUX FALLS, SD 57101-1950
PO BOX 1951, SIOUX FALLS, SD 57101-1951
PO BOX 1952, SIOUX FALLS, SD 57101-1952
PO BOX 1953, SIOUX FALLS, SD 57101-1953
PO BOX 1954, SIOUX FALLS, SD 57101-1954
PO BOX 1955, SIOUX FALLS, SD 57101-1955
PO BOX 1956, SIOUX FALLS, SD 57101-1956
PO BOX 1957, SIOUX FALLS, SD 57101-1957
PO BOX 1958, SIOUX FALLS, SD 57101-1958
PO BOX 1959, SIOUX FALLS, SD 57101-1959
PO BOX 1960, SIOUX FALLS, SD 57101-1960
PO BOX 1961, SIOUX FALLS, SD 57101-1961
PO BOX 1962, SIOUX FALLS, SD 57101-1962
PO BOX 1963, SIOUX FALLS, SD 57101-1963
PO BOX 1964, SIOUX FALLS, SD 57101-1964
PO BOX 1965, SIOUX FALLS, SD 57101-1965
PO BOX 1966, SIOUX FALLS, SD 57101-1966
PO BOX 1967, SIOUX FALLS, SD 57101-1967
PO BOX 1968, SIOUX FALLS, SD 57101-1968
PO BOX 1969, SIOUX FALLS, SD 57101-1969
PO BOX 1970, SIOUX FALLS, SD 57101-1970
PO BOX 1971, SIOUX FALLS, SD 57101-1971
PO BOX 1972, SIOUX FALLS, SD 57101-1972
PO BOX 1973, SIOUX FALLS, SD 57101-1973
PO BOX 1974, SIOUX FALLS, SD 57101-1974
PO BOX 1975, SIOUX FALLS, SD 57101-1975
PO BOX 1976, SIOUX FALLS, SD 57101-1976
PO BOX 1977, SIOUX FALLS, SD 57101-1977
PO BOX 1978, SIOUX FALLS, SD 57101-1978
PO BOX 1979, SIOUX FALLS, SD 57101-1979
PO BOX 1980, SIOUX FALLS, SD 57101-1980
PO BOX 1981, SIOUX FALLS, SD 57101-1981
PO BOX 1982, SIOUX FALLS, SD 57101-1982
PO BOX 1983, SIOUX FALLS, SD 57101-1983
PO BOX 1984, SIOUX FALLS, SD 57101-1984
PO BOX 1985, SIOUX FALLS, SD 57101-1985
PO BOX 1986, SIOUX FALLS, SD 57101-1986
PO BOX 1987, SIOUX FALLS, SD 57101-1987
PO BOX 1988, SIOUX FALLS, SD 57101-1988
PO BOX 1989, SIOUX FALLS, SD 57101-1989
PO BOX 1990, SIOUX FALLS, SD 57101-1990
PO BOX 1991, SIOUX FALLS, SD 57101-1991
PO BOX 1992, SIOUX FALLS, SD 57101-1992
PO BOX 1993, SIOUX FALLS, SD 57101-1993
PO BOX 1994, SIOUX FALLS, SD 57101-1994
PO BOX 1995, SIOUX FALLS, SD 57101-1995
PO BOX 1996, SIOUX FALLS, SD 57101-1996
PO BOX 1997, SIOUX FALLS, SD 57101-1997
PO BOX 1998, SIOUX FALLS, SD 57101-1998
PO BOX 1999, SIOUX FALLS, SD 57101-1999
PO BOX 2000, SIOUX FALLS, SD 57101-2000
PO BOX 2001, SIOUX FALLS, SD 57101-2001
PO BOX 2002, SIOUX FALLS, SD 57101-2002
PO BOX 2003, SIOUX FALLS, SD 57101-2003
PO BOX 2004, SIOUX FALLS, SD 57101-2004
PO BOX 2005, SIOUX FALLS, SD 57101-2005
PO BOX 2006, SIOUX FALLS, SD 57101-2006
PO BOX 2007, SIOUX FALLS, SD 57101-2007
PO BOX 2008, SIOUX FALLS, SD 57101-2008
PO BOX 2009, SIOUX FALLS, SD 57101-2009
PO BOX 2010, SIOUX FALLS, SD 57101-2010
PO BOX 2011, SIOUX FALLS, SD 57101-2011
PO BOX 2012, SIOUX FALLS, SD 57101-2012
PO BOX 2013, SIOUX FALLS, SD 57101-2013
PO BOX 2014, SIOUX FALLS, SD 57101-2014
PO BOX 2015, SIOUX FALLS, SD 57101-2015
PO BOX 2016, SIOUX FALLS, SD 57101-2016
PO BOX 2017, SIOUX FALLS, SD 57101-2017
PO BOX 2018, SIOUX FALLS, SD 57101-2018
PO BOX 2019, SIOUX FALLS, SD 57101-2019
PO BOX 2020, SIOUX FALLS, SD 57101-2020
PO BOX 2021, SIOUX FALLS, SD 57101-2021
PO BOX 2022, SIOUX FALLS, SD 57101-2022
PO BOX 2023, SIOUX FALLS, SD 57101-2023
PO BOX 2024, SIOUX FALLS, SD 57101-2024
PO BOX 2025, SIOUX FALLS, SD 57101-2025
PO BOX 2026, SIOUX FALLS, SD 57101-2026
PO BOX 2027, SIOUX FALLS, SD 57101-2027
PO BOX 2028, SIOUX FALLS, SD 57101-2028
PO BOX 2029, SIOUX FALLS, SD 57101-2029
PO BOX 2030, SIOUX FALLS, SD 57101-2030
PO BOX 2031, SIOUX FALLS, SD 57101-2031
PO BOX 2032, SIOUX FALLS, SD 57101-2032
PO BOX 2033, SIOUX FALLS, SD 57101-2033
PO BOX 2034, SIOUX FALLS, SD 57101-2034
PO BOX 2035, SIOUX FALLS, SD 57101-2035
PO BOX 2036, SIOUX FALLS, SD 57101-2036
PO BOX 2037, SIOUX FALLS, SD 57101-2037
PO BOX 2038, SIOUX FALLS, SD 57101-2038
PO BOX 2039, SIOUX FALLS, SD 57101-2039
PO BOX 2040, SIOUX FALLS, SD 57101-2040
PO BOX 2041, SIOUX FALLS, SD 57101-2041
PO BOX 2042, SIOUX FALLS, SD 57101-2042
PO BOX 2043, SIOUX FALLS, SD 57101-2043
PO BOX 2044, SIOUX FALLS, SD 57101-2044
PO BOX 2045, SIOUX FALLS, SD 57101-2045
PO BOX 2046, SIOUX FALLS, SD 57101-2046
PO BOX 2047, SIOUX FALLS, SD 57101-2047
PO BOX 2048, SIOUX FALLS, SD 57101-2048
PO BOX 2049, SIOUX FALLS, SD 57101-2049
PO BOX 2050, SIOUX FALLS, SD 57101-2050
PO BOX 2051, SIOUX FALLS, SD 57101-2051
PO BOX 2052, SIOUX FALLS, SD 57101-2052
PO BOX 2053, SIOUX FALLS, SD 57101-2053
PO BOX 2054, SIOUX FALLS, SD 57101-2054
PO BOX 2055, SIOUX FALLS, SD 57101-2055
PO BOX 2056, SIOUX FALLS, SD 57101-2056
PO BOX 2057, SIOUX FALLS, SD 57101-2057
PO BOX 2058, SIOUX FALLS, SD 57101-2058
PO BOX 2059, SIOUX FALLS, SD 57101-2059
PO BOX 2060, SIOUX FALLS, SD 57101-2060
PO BOX 2061, SIOUX FALLS, SD 57101-2061
PO BOX 2062, SIOUX FALLS, SD 57101-2062
PO BOX 2063, SIOUX FALLS, SD 57101-2063
PO BOX 2064, SIOUX FALLS, SD 57101-2064
PO BOX 2065, SIOUX FALLS, SD 57101-2065
PO BOX 2066, SIOUX FALLS, SD 57101-2066
PO BOX 2067, SIOUX FALLS, SD 57101-2067
PO BOX 2068, SIOUX FALLS, SD 57101-2068
PO BOX 2069, SIOUX FALLS, SD 57101-2069
PO BOX 2070, SIOUX FALLS, SD 57101-2070
PO BOX 2071, SIOUX FALLS, SD 57101-2071
PO BOX 2072, SIOUX FALLS, SD 57101-2072
PO BOX 2073, SIOUX FALLS, SD 57101-2073
PO BOX 2074, SIOUX FALLS, SD 57101-2074
PO BOX 2075, SIOUX FALLS, SD 57101-2075
PO BOX 2076, SIOUX FALLS, SD 57101-2076
PO BOX 2077, SIOUX FALLS, SD 57101-2077
PO BOX 2078, SIOUX FALLS, SD 57101-2078
PO BOX 2079, SIOUX FALLS, SD 57101-2079
PO BOX 2080, SIOUX FALLS, SD 57101-2080
PO BOX 2081, SIOUX FALLS, SD 57101-2081
PO BOX 2082, SIOUX FALLS, SD 57101-2082
PO BOX 2083, SIOUX FALLS, SD 57101-2083
PO BOX 2084, SIOUX FALLS, SD 57101-2084
PO BOX 2085, SIOUX FALLS, SD 57101-2085
PO BOX 2086, SIOUX FALLS, SD 57101-2086
PO BOX 2087, SIOUX FALLS, SD 57101-2087
PO BOX 2088, SIOUX FALLS, SD 57101-2088
PO BOX 2089, SIOUX FALLS, SD 57101-2089
PO BOX 2090, SIOUX FALLS, SD 57101-2090
PO BOX 2091, SIOUX FALLS, SD 57101-2091
PO BOX 2092, SIOUX FALLS, SD 57101-2092
PO BOX 2093, SIOUX FALLS, SD 57101-2093
PO BOX 2094, SIOUX FALLS, SD 57101-2094
PO BOX 2095, SIOUX FALLS, SD 57101-2095
PO BOX 2096, SIOUX FALLS, SD 57101-2096
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