Washington County is a county located in the U.S. state of Maine. As of the 2020 census, its population was 31,095, making it the third-least populous county in Maine. Its county seat is Machias. The county was established on June 25, 1789. It borders the Canadian province of New Brunswick. It is sometimes referred to as "Sunrise County" because i…Washington County is a county located in the U.S. state of Maine. As of the 2020 census, its population was 31,095, making it the third-least populous county in Maine. Its county seat is Machias. The county was established on June 25, 1789. It borders the Canadian province of New Brunswick. It is sometimes referred to as "Sunrise County" because it includes the easternmost point in the 48 contiguous United States. Claims have been made that Washington County is where the sun first rises on the 48 contiguous states. Many small seaside communities have small-scale fishing-based economies. Tourism is also important along the county's shoreline, but it is not as important as elsewhere in the state. The blueberry crop plays a major role in the county's economy.