MANCHESTER — The Democratic wave swelled in Manchester on Tuesday, with Republicans prevailing in just six of the 40 contested races that appeared on city residents’ ballots.

Democratic incumbents swept the state Senate seats. In District 16, Kevin Cavanaugh defeated challenger David Boutin 52-48. Donna Soucy cruised past George Lambert 58-42 in District 18, and Lou D’Allesandro bested Carla Gericke by the same margin in District 20.

“If you’re a Democrat, you’re happy and hopefully we can do some good things once the legislative process opens up,” D’Allesandro said.

Former mayor Ted Gatsas was the highest profile Republican victor on city ballots, winning the contest for the Executive Council seat with 49 percent of the vote. Democrat Gray Chynoweth garnered 47 percent and independent Richard Tomasso received 4 percent.

In the House races, Manchester votes helped carry Democrats to 26 of the 30 seats. Republicans won both seats in Hillsborough District 44 (Wards 8 and 9) and picked up one seat each in District 13 (Ward 6) and District 15 (Ward 8).

Democrat Michael Conlon ousted incumbent County Attorney Republican Dennis Hogan. And Sheriff James Hardy, a Republican, fended off Democrat Bill Barry, to retain his position.