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 11911, SANTA BARBARA, CA 93107-1911
PO BOX 11912, SANTA BARBARA, CA 93107-1912
PO BOX 11913, SANTA BARBARA, CA 93107-1913
PO BOX 11914, SANTA BARBARA, CA 93107-1914
PO BOX 11915, SANTA BARBARA, CA 93107-1915
PO BOX 11916, SANTA BARBARA, CA 93107-1916
PO BOX 11917, SANTA BARBARA, CA 93107-1917
PO BOX 11918, SANTA BARBARA, CA 93107-1918
PO BOX 11919, SANTA BARBARA, CA 93107-1919
PO BOX 11920, SANTA BARBARA, CA 93107-1920
PO BOX 11921, SANTA BARBARA, CA 93107-1921
PO BOX 11922, SANTA BARBARA, CA 93107-1922
PO BOX 11923, SANTA BARBARA, CA 93107-1923
PO BOX 11924, SANTA BARBARA, CA 93107-1924
PO BOX 11925, SANTA BARBARA, CA 93107-1925
PO BOX 11926, SANTA BARBARA, CA 93107-1926
PO BOX 11927, SANTA BARBARA, CA 93107-1927
PO BOX 11928, SANTA BARBARA, CA 93107-1928
PO BOX 11929, SANTA BARBARA, CA 93107-1929
PO BOX 11930, SANTA BARBARA, CA 93107-1930
PO BOX 11931, SANTA BARBARA, CA 93107-1931
PO BOX 11932, SANTA BARBARA, CA 93107-1932
PO BOX 11933, SANTA BARBARA, CA 93107-1933
PO BOX 11934, SANTA BARBARA, CA 93107-1934
PO BOX 11935, SANTA BARBARA, CA 93107-1935
PO BOX 11936, SANTA BARBARA, CA 93107-1936
PO BOX 11937, SANTA BARBARA, CA 93107-1937
PO BOX 11938, SANTA BARBARA, CA 93107-1938
PO BOX 11939, SANTA BARBARA, CA 93107-1939
PO BOX 11940, SANTA BARBARA, CA 93107-1940
PO BOX 11941, SANTA BARBARA, CA 93107-1941
PO BOX 11942, SANTA BARBARA, CA 93107-1942
PO BOX 11943, SANTA BARBARA, CA 93107-1943
PO BOX 11944, SANTA BARBARA, CA 93107-1944
PO BOX 11945, SANTA BARBARA, CA 93107-1945
PO BOX 11946, SANTA BARBARA, CA 93107-1946
PO BOX 11947, SANTA BARBARA, CA 93107-1947
PO BOX 11948, SANTA BARBARA, CA 93107-1948
PO BOX 11949, SANTA BARBARA, CA 93107-1949
PO BOX 11950, SANTA BARBARA, CA 93107-1950
PO BOX 11951, SANTA BARBARA, CA 93107-1951
PO BOX 11952, SANTA BARBARA, CA 93107-1952
PO BOX 11953, SANTA BARBARA, CA 93107-1953
PO BOX 11954, SANTA BARBARA, CA 93107-1954
PO BOX 11955, SANTA BARBARA, CA 93107-1955
PO BOX 11956, SANTA BARBARA, CA 93107-1956
PO BOX 11957, SANTA BARBARA, CA 93107-1957
PO BOX 11958, SANTA BARBARA, CA 93107-1958
PO BOX 11959, SANTA BARBARA, CA 93107-1959
PO BOX 11960, SANTA BARBARA, CA 93107-1960
PO BOX 11961, SANTA BARBARA, CA 93107-1961
PO BOX 11962, SANTA BARBARA, CA 93107-1962
PO BOX 11963, SANTA BARBARA, CA 93107-1963
PO BOX 11964, SANTA BARBARA, CA 93107-1964
PO BOX 11965, SANTA BARBARA, CA 93107-1965
PO BOX 11966, SANTA BARBARA, CA 93107-1966
PO BOX 11967, SANTA BARBARA, CA 93107-1967
PO BOX 11968, SANTA BARBARA, CA 93107-1968
PO BOX 11969, SANTA BARBARA, CA 93107-1969
PO BOX 11970, SANTA BARBARA, CA 93107-1970
PO BOX 11971, SANTA BARBARA, CA 93107-1971
PO BOX 11972, SANTA BARBARA, CA 93107-1972
PO BOX 11973, SANTA BARBARA, CA 93107-1973
PO BOX 11974, SANTA BARBARA, CA 93107-1974
PO BOX 11975, SANTA BARBARA, CA 93107-1975
PO BOX 11976, SANTA BARBARA, CA 93107-1976
PO BOX 11977, SANTA BARBARA, CA 93107-1977
PO BOX 11978, SANTA BARBARA, CA 93107-1978
PO BOX 11979, SANTA BARBARA, CA 93107-1979
PO BOX 11980, SANTA BARBARA, CA 93107-1980
PO BOX 11981, SANTA BARBARA, CA 93107-1981
PO BOX 11982, SANTA BARBARA, CA 93107-1982
PO BOX 11983, SANTA BARBARA, CA 93107-1983
PO BOX 11984, SANTA BARBARA, CA 93107-1984
PO BOX 11985, SANTA BARBARA, CA 93107-1985
PO BOX 11986, SANTA BARBARA, CA 93107-1986
PO BOX 11987, SANTA BARBARA, CA 93107-1987
PO BOX 11988, SANTA BARBARA, CA 93107-1988
PO BOX 11989, SANTA BARBARA, CA 93107-1989
PO BOX 11990, SANTA BARBARA, CA 93107-1990
PO BOX 11991, SANTA BARBARA, CA 93107-1991
PO BOX 11992, SANTA BARBARA, CA 93107-1992
PO BOX 11993, SANTA BARBARA, CA 93107-1993
PO BOX 11994, SANTA BARBARA, CA 93107-1994
PO BOX 11995, SANTA BARBARA, CA 93107-1995
PO BOX 11996, SANTA BARBARA, CA 93107-1996
PO BOX 11997, SANTA BARBARA, CA 93107-1997
PO BOX 11998, SANTA BARBARA, CA 93107-1998
PO BOX 11999, SANTA BARBARA, CA 93107-1999
PO BOX 12000, SANTA BARBARA, CA 93107-2000
PO BOX 12001, SANTA BARBARA, CA 93107-2001
PO BOX 12002, SANTA BARBARA, CA 93107-2002
PO BOX 12003, SANTA BARBARA, CA 93107-2003
PO BOX 12004, SANTA BARBARA, CA 93107-2004
PO BOX 12005, SANTA BARBARA, CA 93107-2005
PO BOX 12006, SANTA BARBARA, CA 93107-2006
PO BOX 12007, SANTA BARBARA, CA 93107-2007
PO BOX 12008, SANTA BARBARA, CA 93107-2008
PO BOX 12009, SANTA BARBARA, CA 93107-2009
PO BOX 12010, SANTA BARBARA, CA 93107-2010
PO BOX 12011, SANTA BARBARA, CA 93107-2011
PO BOX 12012, SANTA BARBARA, CA 93107-2012
PO BOX 12013, SANTA BARBARA, CA 93107-2013
PO BOX 12014, SANTA BARBARA, CA 93107-2014
PO BOX 12015, SANTA BARBARA, CA 93107-2015
PO BOX 12016, SANTA BARBARA, CA 93107-2016
PO BOX 12017, SANTA BARBARA, CA 93107-2017
PO BOX 12018, SANTA BARBARA, CA 93107-2018
PO BOX 12019, SANTA BARBARA, CA 93107-2019
PO BOX 12020, SANTA BARBARA, CA 93107-2020
PO BOX 12021, SANTA BARBARA, CA 93107-2021
PO BOX 12022, SANTA BARBARA, CA 93107-2022
PO BOX 12023, SANTA BARBARA, CA 93107-2023
PO BOX 12024, SANTA BARBARA, CA 93107-2024
PO BOX 12025, SANTA BARBARA, CA 93107-2025
PO BOX 12026, SANTA BARBARA, CA 93107-2026
PO BOX 12027, SANTA BARBARA, CA 93107-2027
PO BOX 12028, SANTA BARBARA, CA 93107-2028
PO BOX 12029, SANTA BARBARA, CA 93107-2029
PO BOX 12030, SANTA BARBARA, CA 93107-2030
PO BOX 12031, SANTA BARBARA, CA 93107-2031
PO BOX 12032, SANTA BARBARA, CA 93107-2032
PO BOX 12033, SANTA BARBARA, CA 93107-2033
PO BOX 12034, SANTA BARBARA, CA 93107-2034
PO BOX 12035, SANTA BARBARA, CA 93107-2035
PO BOX 12036, SANTA BARBARA, CA 93107-2036
PO BOX 12037, SANTA BARBARA, CA 93107-2037
PO BOX 12038, SANTA BARBARA, CA 93107-2038
PO BOX 12039, SANTA BARBARA, CA 93107-2039
PO BOX 12040, SANTA BARBARA, CA 93107-2040
PO BOX 12041, SANTA BARBARA, CA 93107-2041
PO BOX 12042, SANTA BARBARA, CA 93107-2042
PO BOX 12043, SANTA BARBARA, CA 93107-2043
PO BOX 12044, SANTA BARBARA, CA 93107-2044
PO BOX 12045, SANTA BARBARA, CA 93107-2045
PO BOX 12046, SANTA BARBARA, CA 93107-2046
PO BOX 12047, SANTA BARBARA, CA 93107-2047
PO BOX 12048, SANTA BARBARA, CA 93107-2048
PO BOX 12049, SANTA BARBARA, CA 93107-2049
PO BOX 12050, SANTA BARBARA, CA 93107-2050
PO BOX 12051, SANTA BARBARA, CA 93107-2051
PO BOX 12052, SANTA BARBARA, CA 93107-2052
PO BOX 12053, SANTA BARBARA, CA 93107-2053
PO BOX 12054, SANTA BARBARA, CA 93107-2054
PO BOX 12055, SANTA BARBARA, CA 93107-2055
PO BOX 12056, SANTA BARBARA, CA 93107-2056
PO BOX 12057, SANTA BARBARA, CA 93107-2057
PO BOX 12058, SANTA BARBARA, CA 93107-2058
PO BOX 12059, SANTA BARBARA, CA 93107-2059
PO BOX 12060, SANTA BARBARA, CA 93107-2060
PO BOX 12061, SANTA BARBARA, CA 93107-2061
PO BOX 12062, SANTA BARBARA, CA 93107-2062
PO BOX 12063, SANTA BARBARA, CA 93107-2063
PO BOX 12064, SANTA BARBARA, CA 93107-2064
PO BOX 12065, SANTA BARBARA, CA 93107-2065
PO BOX 12066, SANTA BARBARA, CA 93107-2066
PO BOX 12067, SANTA BARBARA, CA 93107-2067
PO BOX 12068, SANTA BARBARA, CA 93107-2068
PO BOX 12069, SANTA BARBARA, CA 93107-2069
PO BOX 12070, SANTA BARBARA, CA 93107-2070
PO BOX 12071, SANTA BARBARA, CA 93107-2071
PO BOX 12072, SANTA BARBARA, CA 93107-2072
PO BOX 12073, SANTA BARBARA, CA 93107-2073
PO BOX 12074, SANTA BARBARA, CA 93107-2074
PO BOX 12075, SANTA BARBARA, CA 93107-2075
PO BOX 12076, SANTA BARBARA, CA 93107-2076
PO BOX 12077, SANTA BARBARA, CA 93107-2077
PO BOX 12078, SANTA BARBARA, CA 93107-2078
PO BOX 12079, SANTA BARBARA, CA 93107-2079
PO BOX 12080, SANTA BARBARA, CA 93107-2080
PO BOX 12081, SANTA BARBARA, CA 93107-2081
PO BOX 12082, SANTA BARBARA, CA 93107-2082
PO BOX 12083, SANTA BARBARA, CA 93107-2083
PO BOX 12084, SANTA BARBARA, CA 93107-2084
PO BOX 12085, SANTA BARBARA, CA 93107-2085
PO BOX 12086, SANTA BARBARA, CA 93107-2086
PO BOX 12087, SANTA BARBARA, CA 93107-2087
PO BOX 12088, SANTA BARBARA, CA 93107-2088
PO BOX 12089, SANTA BARBARA, CA 93107-2089
PO BOX 12090, SANTA BARBARA, CA 93107-2090
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