Index of Oregon Partisan Voter Registration Ratio


These data include statewide Oregon Democratic and Republican registration data since World War II.

The Democratic advantage increased steadily until the mid 1970s. Since that time it declined steadily until a sudden uptick in 2008.

The ratio of Democratic to Repbulican voters is one way to assess partisan strength. The index measures the ratio of Democratic voters to Republican voters.

Index = 100*(Democratic Pct./Republican Pct.)

Source of data: Oregon Secretary of State

Comments are closed.