"United States Census, 1850," index and images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M446-NTJ : accessed 18 May 2015), Mathew Mcgregor, South Fayette, Allegheny, Pennsylvania, United States; citing family 15, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
Noted events in his life were:
• United States Census: Residence, 1850, South Fayette, Allegheny, Pennsylvania, United States. Age 31
• United States Census: Residence, 1870, 5th Ward Allegheny, Allegheny County, PA. Age 52
Mathew married Rachel Williams Leas, daughter of William Jones Leas and Nancy Ann Williams. (Rachel Williams Leas was born on 2 Mar 1825 in Allegheny County, Pennsylvania, USA, died on 27 Nov 1901 in Pittsburgh, Allegheny County, Pennsylvania, USA 3 and was buried in Union Dale Cemetery, Pittsburgh, Allegheny County, Pennsylvania, USA.)
1 FamilySearch.org, <i>United States Census for 1850</i> (www.familysearch.org : accessed 18 May 2015).
2 Wilmaann - ancestry.com.
Russ McGregor(http://www.genealogy.com/forum/surnames/topics/leas/37/ : accessed 20 May 2015).