Los Angeles County, California:
1904 T. Roosevelt>50%
1908 Taft> 50%
1912: T. Roosevelt
1916: Hughes >60%
1920: Harding >70%
1924: Coolidge >70%
1928: Smith >30%
1932: Roosevelt > 40%
1936: Roosevelt > 50%
1940: Roosevelt > 50%
1944: Roosevelt > 40%
1948: Truman > 40%
1952: Eisenhower >50%
1956: Eisenhower > 60%
1960: Kennedy > 50%
1964: Johnson > 70%
1968: Humphrey > 50%
1972: McGovern > 40%
1976: Carter > 60%
1980: Carter > 50%
1984: Reagan >50%
1988: Dukakis > 70%
1992: Clinton > 50%
1996: Clinton > 60%
2000: Gore > 60%
2004: Kerry > 70%
2008: Obama > 70%
2012: Obama > 70%
What source are you using? Just by using this site, I can tell most of those recent ones are wrong. Are you doing the city of Los Angeles?
You were commenting before I was done posting the final version. Of Note, Los Angeles City does generally vote at least 10% more democratic then the countywide vote in any given election of the past 50 or so years. I am a resident in the city. I am noting a democratic victory in the city by both McGovern and Mondale despite both losing the county wide vote.