The Los Angeles County Sheriff’s Department saw a more than three-percent drop countywide in both violent and serious property crimes through the end of September, compared to the same time last year, with the Marina del Rey Sheriff’s Station showing the largest reduction in violent crime, according to crime data.

Preliminary crime data through Sept. 30 showed that violent crimes — defined as homicide, rape, robbery and aggravated assault — dropped by 3.57 percent from last year in the Sheriff’s Department patrol areas countywide, while serious property crimes — burglary, larceny theft, grand theft auto and arson — declined by 3.45 percent. Overall Part I crime, which includes violent and serious property crimes, was reduced by 3.47 percent from the same time last year, according to the department.

The Sheriff’s station that experienced the most significant decrease in overall violent crime was Marina del Rey at 30.7 percent, followed by the Walnut Station at 29.2 percent and Industry Station at 25.8 percent. The Marina station, which also serves Ladera Heights, Windsor Hills and View Park, has seen a 12.3-percent decrease in violent crime since 2005.

With a 7.6-percent drop in property crime from September 2009, the Marina station has reported a 10.2-percent drop in overall Part I crime, data show.

The Sheriff’s Department additionally reported that the number of homicides in patrol areas countywide has decreased by 15.1 percent to 134 through Sept. 30, compared to the same time last year. This continues a decrease for the fifth consecutive year, resulting in a 50.55-percent reduction in homicides since 2005 and the lowest homicide rate since 1975, Sheriff’s officials said.