On November 4, Vermont elected two independents to the State House of Representatives: Will Stevens was re-elected, and Adam Greshin was elected by defeating an incumbent Democrat.
Vermont has five Progressives in the House: David Zuckerman, Sandy Haas, Susan Davis, Sarah Edwards, and newcomer Mollie Burke. The Progressive had elected six in 2006. They lost two incumbents, Dexter Randall and Chris Pearson.
And from the comments:
The New Hampshire Libertarians had 4 after the 1992 election. The Alaska Libertarians never had more than two at one time (which was after the 1980 election). They also had one after the 1978 election and a different one after the 1984 election.