Jet City Improv was created in 1992.
The Improv was created in 1963.
Jet City Rollergirls was created in 2006.
Jet City Woman was created in 1991.
Improv Asylum was created in 1998.
Philly Improv Theater was created in 2005.
Laughing Gas - improv - was created in 1992.
The Georgetown Improv Association was created in 1995.
Washington Improv Theater was created in 1986.
Drew Carey's Improv-A-Ganza was created on 2011-04-11.
The cast of Improv City - 2008 includes: Lindsey Fisher Brian Posen as Herb Durbin Patrick Riedy David Rispoli
Gypsy Improv - 2006 was released on: USA: 17 December 2006 (New York City, New York) (premiere)
It is a New York city based prank collective. Here is a website.