Peter McIntyre Clegg was born on 15 October 1859 to Benjamin Clegg and Grace McIntyre in Tooele, Utah Territory. He worked for a time as a freighter before becoming a stock raiser. He was also president of the Tooele County State Bank. He married Edith Maughan Atkin on 27 January 1886; she died in 1890. He then married Agnes R. McLaws on 24 June 1895. After she died in 1903, he married Ellen Matilda Lindberg on 31 October 1906. Ellen died in 1908, and Clegg subsequently married Ida Mary Lane on 22 September 1910. Clegg was involved in civic affairs, serving in the Utah legislature and as mayor of Tooele. He died on 1 May 1945 in Tooele.
 “Hon. Peter Clegg,” in Noble Warrum, ed., Utah since Statehood: Historical and Biographical (Chicago: S. J. Clarke Publishing, 1919), 2:206–209; “Clegg, Peter McIntyre,” in Frank Esshom, Pioneers and Prominent Men of Utah (Salt Lake City: Utah Pioneers Book Publishing, 1913), 811; “Edith Atkin Clegg,” Tooele City Cemetery, Tooele, Tooele Co., UT, Find a Grave, posted 1 Feb. 2000 (memorial no. 88386), accessed 8 July 2019, https://www.findagrave.com/memorial/88386; Peter Clegg and Agnes R. McLaws, marriage license, 24 June 1895, “Utah, Tooele County Records, 1855–1956,” database with images, FamilySearch, https://www.familysearch.org/ark:/61903/3:1:3QS7-L9Q9-9FW1?i=591; Agnes Clegg, 25 Sept. 1903, in “Utah, Salt Lake County Death Records, 1849–1949,” database with images, FamilySearch, https://www.familysearch.org/ark:/61903/3:1:S3HT-DTQ9-H8P?i=446; Peter Clegg and Ellen M. Lindberg, marriage license, 31 Oct. 1906, Salt Lake County, Utah, Marriage Records, 1887–1965, film no. 004262243, FHL; Ellen Matilda Clegg, death certificate, 22 Jan. 1908, “Utah Death Certificates,” database with images, FamilySearch, https://www.familysearch.org/ark:/61903/3:1:S3HT-DZK7-3FB?i=1; Peter M. Clegg and Ida M. Lane, marriage license, 22 Sept. 1910, Salt Lake County, Utah, Marriage Records, 1887–1965, film no. 005237846, FHL; Peter McIntyre Clegg, death certificate, 1 May 1945, “Utah Death Certificates, 1904–1964,” database with images, FamilySearch, https://www.familysearch.org/ark:/61903/3:1:S3HT-DYQQ-76C?i=17.