Question: The county that Doris Beck was the first woman to serve as a Mayor of had a population of what in 2010?
Sentence (from "Essex County, New Jersey"): In 2010, the county dropped down to third-largest, behind Middlesex County, and was one of only two counties in the state to see a decline between 2000 and 2010 (Cape May County being the other).
Relevant evidence: No