That's more than four times the 2.8 million viewers "The Late Show" has averaged for the 2014-15 season. The Wednesday telecast was the fourth most-watched
Letterman's finale on Wednesday averaged a 3.1 rating among 18 to 49 year olds, the group most coveted by advertisers. That number is the highest since Dec. 1, 2005, when Letterman had
Only three "Late Show" telecasts have had larger audiences than the Letterman farewell. The largest was on February 25, 1994 following CBS coverage of the Winter Olympics in Lillehammer.
Letterman's debut on CBS on August 30, 1993, was the second most watched episode, with 15.1 million viewers.
Another post-Olympics episode on February 23, 1994 ranks third with 14.2 million viewers
In Los Angeles, Letterman's
Full coverage: David Letterman retires
In Letterman's home town of Indianapolis, "Late Show" delivered a 12.2 rating and a 32 share. The rating was a 12.2 in Chicago as well, with a 27 share of the audience.
The highest rated market was Dayton, Ohio, where "The Late Show" scored an 18.4 rating and a 42 share.
DAVID LETTERMAN'S FAREWELL: