1900 - US Census - Washita Township, Custer, Oklahoma Territory
Household ............Role ........Sex ......Age Birthplace Birth Date
John W Shirley .....Head .......Male ....47 ..Missouri ....Mar 1853
Sonora Shirley ......Wife ........Female 52 ..Missouri ....Mar 1848
Sicily Shirley .........Daughter Female 19 ..Missouri ....Mar 1881
George Shirley ......Son .........Male ....18 ..Missouri ....Jul 1882
Estel Shirley ..........Son .........Male ....12 ..Missouri ....Jun 1888
Izora Shirley ..........Daughter Female 8 ....Missouri ....Mar 1892
Rufus Shirley ........Son ..........Male ....5 ....Missouri ....May 1895
Earnestine Shirley Daughter Female 3 ....Missouri ....Jan 1897

1910 - US Census - Altus Ward 1, Jackson, Oklahoma
Household ...........Role .......Sex ......Age Birthplace
John W Shirley ....Head ......Male ....57 ..Missouri
Sonora Shirley ....Wife ........Female 52 ..Missouri
Sicily L Shirley ....Daughter Female 29 ..Missouri
Estel H Shirley ....Son .........Male ....21 ..Missouri
Izora B Shirley ....Daughter Female 18 ..Missouri
Rufus B Shirley ...Son .........Male ....14 ..Missouri
Ernestine Shirley Daughter Female 13 ..Missouri
William C Stone ..Husband .Male ....54 ..Arkansas
Emma C Stone ....Wife .........Female 54 ..Arkansas
Joseph Gillespie .Boarder ...Male ....27 ..Texas
George W J Hess .Boarder ...Male ....25
Ira Lawetz ............Boarder ...Male ....26 ..Belgium

1920 - US Census - Roger Mills, Oklahoma
Household .......Role .........Sex ......Age Birthplace
Albert G Cowan Head .......Male ....34 ..Arkansas
Zora B Cowan ...Wife ........Female 27 ..Missouri
Albert G Cowan Son ..........Male ....4 ....Oklahoma
Ada M Cowan ....Daughter Female 2 ....Oklahoma

1930 - US Census - Chilhowee, Johnson, Missouri
Household .............Role........ Sex .....Age Birthplace
Albert G Cowan .....Head .......Male ....45 ..Arkansas
Izna V Cowan .........Wife ........Female 38 ..Missouri
Albert G Cowan, Jr Son .........Male ....14 ..Oklahoma
Sonora J Cowan ....Daughter Female 9 ....Oklahoma
Marjorie B Cowan ..Daughter Female 6 ....Missouri

Izora moved to Los Angeles, California in about 1937.

1940 - US Census - Los Angeles, Los Angeles, California
Household ..............Role ................Sex .....Age Birthplace
Albert G Cowan ......Head ...............Male ....56 ..Arkansas
Izora B Cowan ........Wife .................Female 48 ..Missouri
Albert G Cowan ......Son ..................Male ....24 ..Oklahoma
Sonora Joe Cowan Daughter .........Female 19 ..Oklahoma
Marjorie B Cowan ..Daughter .........Female 17 ..Missouri
Rufus B Shirley .......Brother-in-law Male ....44 ..Missouri

Izora was living at 4492 West 16th Place, Los Angeles, California when she became ill and was taken to the Monte Sano Hospital. After 4 days in the hospital she passed away 11:45 pm on December 3, 1943.