The 78th Oregon Legislative Assembly convened beginning on February 2, 2015, for the first of its two regular sessions. All of the 60 seats in the House of Representatives and 14 of the 30 seats in the State Senate were up for election in 2014; the general election for those seats took place on November 4, 2014.

The Democratic Party of Oregon expanded its majority in the Senate to 18–12 and its majority in the House to 35–25. Oregon was the only state where Democrats made net gains in both legislative chambers in the 2014 midterm elections.

Based on the results of the 2014 elections, the Oregon State Senate is composed of 18 Democrats and 12 Republicans.

The Oregon State Senate is composed of 18 Democrats and 12 Republicans. Democrats picked up Districts 8 and 15 in the 2014 elections for a net gain of two seats.

Senate President: Peter Courtney (D–11 Salem)
President Pro Tem: Ginny Burdick (D–18 Portland)
Majority Leader: Diane Rosenbaum (D–21 Portland)
Minority Leader: Ted Ferrioli (R–30 John Day)

Based on the results of the 2014 elections, the Oregon House of Representatives is composed of 35 Democrats and 25 Republicans. Democrats won District 20, which was previously Republican-held, while Republicans picked up no additional seats.

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