The Buckley Institute has the numbers. Most incredible is the finding that over 60% (27 of 43) of undergraduate departments have exactly zero Republican faculty members.
This year, the Buckley Institute built on the progress of last year's effort and examined the political leanings of 1,666 faculty members across all 43 undergraduate degree-granting departments, as well as the law school and school of management.
The Buckley Institute's research found that in undergraduate departments and the law and management schools, 82.3% of faculty are registered Democrats or primarily support Democratic candidates. By contrast, only 15.4% are independent and 2.3% are Republicans. 27 of 43 undergraduate departments had no Republicans at all.