Biloxi ( ) is a city in Harrison County, Mississippi, United States.
 The 2010 United States Census recorded the population as 44,054, and in 2016 the estimated population was 45,975.
 Along with the adjoining city of Gulfport, Biloxi is a county seat of Harrison County.
Jeremiah Joseph Callanan (1795–1829) was an Irish poet born in County Cork, Ireland.
Jeremiah Joseph Coffey (1 January 193319 November 2014) was the seventh Roman Catholic Bishop of the Diocese of Sale, Australia, serving from 1989 until his retirement in 2008.
 On retirement, he was styled Bishop Emeritus of Sale.
Jeremiah Joseph Callahan, C.S.Sp.
 (January 11, 1878 – October 11, 1969) was a Roman Catholic priest and the fifth president of Duquesne University in Pittsburgh, from 1931 until 1940.
Jeremiah Joseph "Jerry" O'Keefe III (July 12, 1923 – August 23, 2016) was an American World War II veteran and decorated fighter pilot ace.
 In addition, he served as a member of the Mississippi House of Representatives and was the mayor of Biloxi, Mississippi from 1973 to 1981.
The Ohr-O'Keefe Museum Of Art is a non-profit art museum located in Biloxi, Mississippi, dedicated to the ceramics of George E. Ohr, the self-proclaimed "Mad Potter of Biloxi".
 The museum is named for ceramic artist George E. Ohr (1857–1918), as well as Annette O'Keefe, late wife of former Biloxi mayor Jeremiah O'Keefe, Sr., who was instrumental in donating money and raising funds for the completion of the museum campus.
Jeremiah Joseph Doyle (5 December 1849 – 1909), was an Irish born Catholic bishop, the bishop of Grafton.
Jeremiah Joseph "Ginger" O'Connell (1887–1944) was a general (later demoted to colonel) in the Irish Defence Forces.
Jeremiah Joseph Duggan (10 November 1980 – 27 March 2003) was a British student in Paris who died during a visit to Wiesbaden, Germany, after being struck by several cars on a dual carriageway.
 The circumstances of his death became a matter of dispute because at the time he died Duggan was attending a youth "cadre" school organised by the LaRouche movement, an international network led by the American political activist Lyndon LaRouche.
Jeremiah Joseph "Jody" O'Keefe IV (May 21, 1946 – December 3, 2007) was an American politician and businessman.

Question: In which county was Jeremiah Joseph O'Keefe mayor from 1973 to 1981?
Answer: Harrison County