1901 Census of Canada Page Information District:ON WELLINGTON (South/Sud) (#126) Subdistrict:Erin B-6 Page 1
McArthur Mary F Head W Jul 28 1840 60 
McArthur Martha J F Daughter S Feb 8 1873 28

1911 Canada Census Record info about Mary MacArthur
Name: Mary MacArthur Gender: Female Marital Status: Widowed Age: 70 Birth Date: July 1840 Birthplace: United States Of America Family Number: 34 Relation to Head of House: Head Immigration Year: 1841 Tribal: Irish Province: Ontario District: Wellington South District Number: 134 Sub-District: Erin Township, Hillsburg Police Village Sub-District Number: 11 Place of Habitation: Erin Tp Census Year: 1911 Page: 4 Household Members: Mary MacArthur 1840, Jean MacArthur 1877, James Melson MacArthur 1898, Newell Mcarthur MacArthur 1899, Andrew Horace MacArthur 1900 (Jean is listed as daughter in law of Mary with the others being grandchildren.  I cannot find where these people fit in)

Mary is listed as age 81 years on her tomb stone at Huxley Cemetery.  The 1901 census states she immigrated from the US.

Ontario, Canada Deaths, 1869-1932 Record info about Mary MacArthur
Name: Mary MacArthur Death Date: 28 Jun 1922 Death Location: York Gender: Female Estimated Birth Year: abt 1841 Birth Location: USA