In the 2010 Maryland House of Delegates race, the voter turnout was approximately 40.5%. This figure reflects the percentage of registered voters in Maryland who participated in the election. The turnout was somewhat lower than in previous election cycles, which can be attributed to various factors, including the competitive nature of the races and voter engagement efforts.

For more detailed insights on specific districts and the overall electoral landscape during that year, you may refer to local election reports or the Maryland State Board of Elections.