The 46-member panel is responsible for the overall supervision and direction of the League, which works to expand and protect local control for California cities.
"I am very honored to have been selected for this pivotal position," Thorne said in a statement. "I look forward to working with my peers throughout the state to continue the strong representation of our region in the effort to retain the control of local issues at the local level."
Thorne also is the board's representative for the East Bay division, where he served as president in 2009. Founded in 1948, the League's East Bay Division is comprised of the 33 cities in Alameda and Contra Costa Counties.
Thorne was re-elected in 2010 to his second four-year term on the council. He also has announced that he will seek the mayor's post in municipal elections in November, to succeed Mayor Jennifer Hosterman, whose eight-year term expires this year.
Another member of the council, Cheryl Cook-Kallio, also has announced her candidacy for the mayor's post.
Thorne served on the city's Parks and Recreation Commission for 10 years before being elected to the City Council. . He currently sits on the California League of Cities' Environmental Policy Committee and on the Community Economic Development Committee for the National League of Cities.