Sean Patrick Hannity was born in New York City, New York, the son of Lillian (Flynn) and Hugh Hannity. Lillian worked as a stenographer and a corrections officer at a county jail, while Hugh was a family-court officer. He is the youngest of four siblings. All of his grandparents immigrated to the United States from Ireland.

Hannity hosted his first talk radio show in 1989 at the volunteer college station at UC Santa Barbara, KCSB-FM, while working as a general contractor. The show aired for 40 hours of air time. Regarding his first show, he said, "I wasn't good at it. I was terrible." Hannity's weekly show on KCSB was canceled after less than a year. This was after two shows featuring the book The AIDS Coverup: The Real and Alarming Facts about AIDS by Gene Antonio; among other remarks made during the broadcast, Hannity told a lesbian caller, "I feel sorry for your child." The university board that governed the station later reversed its decision due to a campaign conducted on Hannity's behalf by the Santa Barbara chapter of the American Civil Liberties Union, which argued that the station had discriminated against Hannity's First Amendment rights. When the station refused to give him a public apology and more airtime, Hannity decided against returning to KCSB.  After leaving KCSB, Hannity placed an ad in radio publications presenting himself as "the most talked about college radio host in America." Radio station WVNN in Athens, Alabama (part of the Huntsville market), then hired him to be the afternoon talk show host. From Huntsville, he moved to WGST in Atlanta in 1992, filling the slot vacated by Neal Boortz, who had moved to competing station WSB. In September 1996, Fox News co-founder Roger Ailes hired the then relatively unknown Hannity to host a television program under the working title Hannity and LTBD ("liberal to be determined"). Alan Colmes was then hired to co-host and the show debuted as Hannity & Colmes.  Later that year, Hannity left WGST for New York, where WABC had him substitute for their afternoon drive time host during Christmas week. In January 1997, WABC put Hannity on the air full-time, giving him the late night time slot. WABC then moved Hannity to the same drive time slot he had filled temporarily a little more than a year earlier. Hannity was on WABC's afternoon time slot from January 1998 until the end of 2013. Since January 2014, Hannity has hosted the 3-6 p.m. time slot on WOR in New York City.  In their 2007 book Common Ground: How to Stop the Partisan War That Is Destroying America, conservative Cal Thomas and liberal Bob Beckel describe Hannity as a leader of the pack among broadcasting political polarizers, which following James Q. Wilson they define as those who have "an intense commitment to a candidate, a culture, or an ideology that sets people in one group definitively apart from people in another, rival group."

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