Massachusetts agriculture officials say a new state law that allows local wineries to sell their products at farmer’s markets has boosted sales and jobs.

According to a state survey, 18 wineries sold more than 34,000 bottles of wines at 63 farmers markets and four agricultural fairs in 2011. The sales totaled more than $500,000 and resulted in a 66 percent increase in overall sales by those wineries last year.

The survey also found that more than half of the wineries planned to take on additional full- or part-time employees, partly as a result of the increased sales.

The law allowing sales of locally-produced wines at farmer’s markets was passed by the Legislature and signed into law by Gov. Deval Patrick in 2010.