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 51901, IDAHO FALLS, ID 83405-1901
PO BOX 51902, IDAHO FALLS, ID 83405-1902
PO BOX 51903, IDAHO FALLS, ID 83405-1903
PO BOX 51904, IDAHO FALLS, ID 83405-1904
PO BOX 51905, IDAHO FALLS, ID 83405-1905
PO BOX 51906, IDAHO FALLS, ID 83405-1906
PO BOX 51907, IDAHO FALLS, ID 83405-1907
PO BOX 51908, IDAHO FALLS, ID 83405-1908
PO BOX 51909, IDAHO FALLS, ID 83405-1909
PO BOX 51910, IDAHO FALLS, ID 83405-1910
PO BOX 51911, IDAHO FALLS, ID 83405-1911
PO BOX 51912, IDAHO FALLS, ID 83405-1912
PO BOX 51913, IDAHO FALLS, ID 83405-1913
PO BOX 51914, IDAHO FALLS, ID 83405-1914
PO BOX 51915, IDAHO FALLS, ID 83405-1915
PO BOX 51916, IDAHO FALLS, ID 83405-1916
PO BOX 51917, IDAHO FALLS, ID 83405-1917
PO BOX 51918, IDAHO FALLS, ID 83405-1918
PO BOX 51919, IDAHO FALLS, ID 83405-1919
PO BOX 51920, IDAHO FALLS, ID 83405-1920
PO BOX 51921, IDAHO FALLS, ID 83405-1921
PO BOX 51922, IDAHO FALLS, ID 83405-1922
PO BOX 51923, IDAHO FALLS, ID 83405-1923
PO BOX 51924, IDAHO FALLS, ID 83405-1924
PO BOX 51925, IDAHO FALLS, ID 83405-1925
PO BOX 51926, IDAHO FALLS, ID 83405-1926
PO BOX 51927, IDAHO FALLS, ID 83405-1927
PO BOX 51928, IDAHO FALLS, ID 83405-1928
PO BOX 51929, IDAHO FALLS, ID 83405-1929
PO BOX 51930, IDAHO FALLS, ID 83405-1930
PO BOX 51931, IDAHO FALLS, ID 83405-1931
PO BOX 51932, IDAHO FALLS, ID 83405-1932
PO BOX 51933, IDAHO FALLS, ID 83405-1933
PO BOX 51934, IDAHO FALLS, ID 83405-1934
PO BOX 51935, IDAHO FALLS, ID 83405-1935
PO BOX 51936, IDAHO FALLS, ID 83405-1936
PO BOX 51937, IDAHO FALLS, ID 83405-1937
PO BOX 51938, IDAHO FALLS, ID 83405-1938
PO BOX 51939, IDAHO FALLS, ID 83405-1939
PO BOX 51940, IDAHO FALLS, ID 83405-1940
PO BOX 51941, IDAHO FALLS, ID 83405-1941
PO BOX 51942, IDAHO FALLS, ID 83405-1942
PO BOX 51943, IDAHO FALLS, ID 83405-1943
PO BOX 51944, IDAHO FALLS, ID 83405-1944
PO BOX 51945, IDAHO FALLS, ID 83405-1945
PO BOX 51946, IDAHO FALLS, ID 83405-1946
PO BOX 51947, IDAHO FALLS, ID 83405-1947
PO BOX 51948, IDAHO FALLS, ID 83405-1948
PO BOX 51949, IDAHO FALLS, ID 83405-1949
PO BOX 51950, IDAHO FALLS, ID 83405-1950
PO BOX 51951, IDAHO FALLS, ID 83405-1951
PO BOX 51952, IDAHO FALLS, ID 83405-1952
PO BOX 51953, IDAHO FALLS, ID 83405-1953
PO BOX 51954, IDAHO FALLS, ID 83405-1954
PO BOX 51955, IDAHO FALLS, ID 83405-1955
PO BOX 51956, IDAHO FALLS, ID 83405-1956
PO BOX 51957, IDAHO FALLS, ID 83405-1957
PO BOX 51958, IDAHO FALLS, ID 83405-1958
PO BOX 51959, IDAHO FALLS, ID 83405-1959
PO BOX 51960, IDAHO FALLS, ID 83405-1960
PO BOX 51961, IDAHO FALLS, ID 83405-1961
PO BOX 51962, IDAHO FALLS, ID 83405-1962
PO BOX 51963, IDAHO FALLS, ID 83405-1963
PO BOX 51964, IDAHO FALLS, ID 83405-1964
PO BOX 51965, IDAHO FALLS, ID 83405-1965
PO BOX 51966, IDAHO FALLS, ID 83405-1966
PO BOX 51967, IDAHO FALLS, ID 83405-1967
PO BOX 51968, IDAHO FALLS, ID 83405-1968
PO BOX 51969, IDAHO FALLS, ID 83405-1969
PO BOX 51970, IDAHO FALLS, ID 83405-1970
PO BOX 51971, IDAHO FALLS, ID 83405-1971
PO BOX 51972, IDAHO FALLS, ID 83405-1972
PO BOX 51973, IDAHO FALLS, ID 83405-1973
PO BOX 51974, IDAHO FALLS, ID 83405-1974
PO BOX 51975, IDAHO FALLS, ID 83405-1975
PO BOX 51976, IDAHO FALLS, ID 83405-1976
PO BOX 51977, IDAHO FALLS, ID 83405-1977
PO BOX 51978, IDAHO FALLS, ID 83405-1978
PO BOX 51979, IDAHO FALLS, ID 83405-1979
PO BOX 51980, IDAHO FALLS, ID 83405-1980
PO BOX 51981, IDAHO FALLS, ID 83405-1981
PO BOX 51982, IDAHO FALLS, ID 83405-1982
PO BOX 51983, IDAHO FALLS, ID 83405-1983
PO BOX 51984, IDAHO FALLS, ID 83405-1984
PO BOX 51985, IDAHO FALLS, ID 83405-1985
PO BOX 51986, IDAHO FALLS, ID 83405-1986
PO BOX 51987, IDAHO FALLS, ID 83405-1987
PO BOX 51988, IDAHO FALLS, ID 83405-1988
PO BOX 51989, IDAHO FALLS, ID 83405-1989
PO BOX 51990, IDAHO FALLS, ID 83405-1990
PO BOX 51991, IDAHO FALLS, ID 83405-1991
PO BOX 51992, IDAHO FALLS, ID 83405-1992
PO BOX 51993, IDAHO FALLS, ID 83405-1993
PO BOX 51994, IDAHO FALLS, ID 83405-1994
PO BOX 51995, IDAHO FALLS, ID 83405-1995
PO BOX 51996, IDAHO FALLS, ID 83405-1996
PO BOX 51997, IDAHO FALLS, ID 83405-1997
PO BOX 51998, IDAHO FALLS, ID 83405-1998
PO BOX 51999, IDAHO FALLS, ID 83405-1999
PO BOX 52000, IDAHO FALLS, ID 83405-2000
PO BOX 52001, IDAHO FALLS, ID 83405-2001
PO BOX 52002, IDAHO FALLS, ID 83405-2002
PO BOX 52003, IDAHO FALLS, ID 83405-2003
PO BOX 52004, IDAHO FALLS, ID 83405-2004
PO BOX 52005, IDAHO FALLS, ID 83405-2005
PO BOX 52006, IDAHO FALLS, ID 83405-2006
PO BOX 52007, IDAHO FALLS, ID 83405-2007
PO BOX 52008, IDAHO FALLS, ID 83405-2008
PO BOX 52009, IDAHO FALLS, ID 83405-2009
PO BOX 52010, IDAHO FALLS, ID 83405-2010
PO BOX 52011, IDAHO FALLS, ID 83405-2011
PO BOX 52012, IDAHO FALLS, ID 83405-2012
PO BOX 52013, IDAHO FALLS, ID 83405-2013
PO BOX 52014, IDAHO FALLS, ID 83405-2014
PO BOX 52015, IDAHO FALLS, ID 83405-2015
PO BOX 52016, IDAHO FALLS, ID 83405-2016
PO BOX 52017, IDAHO FALLS, ID 83405-2017
PO BOX 52018, IDAHO FALLS, ID 83405-2018
PO BOX 52019, IDAHO FALLS, ID 83405-2019
PO BOX 52020, IDAHO FALLS, ID 83405-2020
PO BOX 52021, IDAHO FALLS, ID 83405-2021
PO BOX 52022, IDAHO FALLS, ID 83405-2022
PO BOX 52023, IDAHO FALLS, ID 83405-2023
PO BOX 52024, IDAHO FALLS, ID 83405-2024
PO BOX 52025, IDAHO FALLS, ID 83405-2025
PO BOX 52026, IDAHO FALLS, ID 83405-2026
PO BOX 52027, IDAHO FALLS, ID 83405-2027
PO BOX 52028, IDAHO FALLS, ID 83405-2028
PO BOX 52029, IDAHO FALLS, ID 83405-2029
PO BOX 52030, IDAHO FALLS, ID 83405-2030
PO BOX 52031, IDAHO FALLS, ID 83405-2031
PO BOX 52032, IDAHO FALLS, ID 83405-2032
PO BOX 52033, IDAHO FALLS, ID 83405-2033
PO BOX 52034, IDAHO FALLS, ID 83405-2034
PO BOX 52035, IDAHO FALLS, ID 83405-2035
PO BOX 52036, IDAHO FALLS, ID 83405-2036
PO BOX 52037, IDAHO FALLS, ID 83405-2037
PO BOX 52038, IDAHO FALLS, ID 83405-2038
PO BOX 52039, IDAHO FALLS, ID 83405-2039
PO BOX 52040, IDAHO FALLS, ID 83405-2040
PO BOX 52041, IDAHO FALLS, ID 83405-2041
PO BOX 52042, IDAHO FALLS, ID 83405-2042
PO BOX 52043, IDAHO FALLS, ID 83405-2043
PO BOX 52044, IDAHO FALLS, ID 83405-2044
PO BOX 52045, IDAHO FALLS, ID 83405-2045
PO BOX 52046, IDAHO FALLS, ID 83405-2046
PO BOX 52047, IDAHO FALLS, ID 83405-2047
PO BOX 52048, IDAHO FALLS, ID 83405-2048
PO BOX 52049, IDAHO FALLS, ID 83405-2049
PO BOX 52050, IDAHO FALLS, ID 83405-2050
PO BOX 52051, IDAHO FALLS, ID 83405-2051
PO BOX 52052, IDAHO FALLS, ID 83405-2052
PO BOX 52053, IDAHO FALLS, ID 83405-2053
PO BOX 52054, IDAHO FALLS, ID 83405-2054
PO BOX 52055, IDAHO FALLS, ID 83405-2055
PO BOX 52056, IDAHO FALLS, ID 83405-2056
PO BOX 52057, IDAHO FALLS, ID 83405-2057
PO BOX 52058, IDAHO FALLS, ID 83405-2058
PO BOX 52059, IDAHO FALLS, ID 83405-2059
PO BOX 52060, IDAHO FALLS, ID 83405-2060
PO BOX 52061, IDAHO FALLS, ID 83405-2061
PO BOX 52062, IDAHO FALLS, ID 83405-2062
PO BOX 52063, IDAHO FALLS, ID 83405-2063
PO BOX 52064, IDAHO FALLS, ID 83405-2064
PO BOX 52065, IDAHO FALLS, ID 83405-2065
PO BOX 52066, IDAHO FALLS, ID 83405-2066
PO BOX 52067, IDAHO FALLS, ID 83405-2067
PO BOX 52068, IDAHO FALLS, ID 83405-2068
PO BOX 52069, IDAHO FALLS, ID 83405-2069
PO BOX 52070, IDAHO FALLS, ID 83405-2070
PO BOX 52071, IDAHO FALLS, ID 83405-2071
PO BOX 52072, IDAHO FALLS, ID 83405-2072
PO BOX 52073, IDAHO FALLS, ID 83405-2073
PO BOX 52074, IDAHO FALLS, ID 83405-2074
PO BOX 52075, IDAHO FALLS, ID 83405-2075
PO BOX 52076, IDAHO FALLS, ID 83405-2076
PO BOX 52077, IDAHO FALLS, ID 83405-2077
PO BOX 52078, IDAHO FALLS, ID 83405-2078
PO BOX 52079, IDAHO FALLS, ID 83405-2079
PO BOX 52080, IDAHO FALLS, ID 83405-2080
PO BOX 52081, IDAHO FALLS, ID 83405-2081
PO BOX 52082, IDAHO FALLS, ID 83405-2082
PO BOX 52083, IDAHO FALLS, ID 83405-2083
PO BOX 52084, IDAHO FALLS, ID 83405-2084
PO BOX 52085, IDAHO FALLS, ID 83405-2085
PO BOX 52086, IDAHO FALLS, ID 83405-2086
PO BOX 52087, IDAHO FALLS, ID 83405-2087
PO BOX 52088, IDAHO FALLS, ID 83405-2088
PO BOX 52089, IDAHO FALLS, ID 83405-2089
PO BOX 52090, IDAHO FALLS, ID 83405-2090
PO BOX 52091, IDAHO FALLS, ID 83405-2091
PO BOX 52092, IDAHO FALLS, ID 83405-2092
PO BOX 52093, IDAHO FALLS, ID 83405-2093
PO BOX 52094, IDAHO FALLS, ID 83405-2094
PO BOX 52095, IDAHO FALLS, ID 83405-2095
PO BOX 52096, IDAHO FALLS, ID 83405-2096
PO BOX 52097, IDAHO FALLS, ID 83405-2097
PO BOX 52098, IDAHO FALLS, ID 83405-2098
PO BOX 52099, IDAHO FALLS, ID 83405-2099
PO BOX 52100, IDAHO FALLS, ID 83405-2100
PO BOX 52101, IDAHO FALLS, ID 83405-2101
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