The number of homicides declined last year in the District and in many other jurisdictions throughout the United States, but in Arlington County the figure reached an absolute minimum — none.

No homicides were reported in Arlington last year, for the first time in at least 50 years, said Detective Crystal Nosal, county police spokeswoman.

Nosal said that statistics available to her “go back to 1960, and this is the first year that we have had zero homicides.”

The number of homicides in Arlington in recent years has been small. In 2010 there was one; in 2009, there were two; and in 2008, there were four. The number was as high as 12 in 1990 and 1991.

An FBI report estimated that about 14,700 people nationwide were victims of homicide in 2010 — a rate of about 4.8 per 100,000 people. Arlington’s population was about 208,000 in 2010, according to census figures, suggesting that about 10 homicides a year would conform to national averages.

Several other local jurisdictions had homicide rates last year that fell well below the national rate. But of the counties and large cities in the Washington area, only Arlington reported no homicides.