Dorilus Morrison was elected to represent the 5th district in the Minnesota State Senate and served from 1864 to 1865. He served two non-consecutive terms as mayor of Minneapolis in 1867–68 and 1869–70. Around that same time, he began building a streetcar line in the city. He joined with other businessmen, and eventually hired Thomas Lowry, who got the line up and running in 1875. The line eventually merged with a line in neighboring St. Paul to become Twin City Rapid Transit.

After Morrison died, his body was interred at Lakewood Cemetery in Minneapolis.

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