Extract from the 1900 Census:
Name: Mattie A Bailey
Age at last birthday: 17
Date of birth: Jun 1882 [sic]
Birthplace: Iowa
Race: white
Sex: female
Relationship to head-of-house: daughter
Home in 1900: Britt, Hancock, Iowa
Marital status: single
Able to read, write and speak English: yes
Father's birthplace: Ohio
Mother's birthplace: Wisconsin
Occupation: none
Siblings living at home: Ora S (age 18), Joel D (15), and Alice A (10)
Census place: Britt, Hancock, Iowa; Roll: T623 434; Page: 5B; Enumeration District: 119
Date: 5 Jun 1900

Extract from the 1910 Census:
Name: Mattie A Heacox
Age in 1910: 26
Estimated birth year: 1884
Birthplace: Iowa
Race: white
Sex: female
Relationship to head of family: wife
Home in 1910: Britt Township, Hancock, Iowa
Address: Second Street
Marital status: married
Number of years of present marriage: 5
Number of children: 2
Number of children now living: 2
Able to speak English: yes
Able to read and write: yes
Father's birthplace: Ohio
Mother's birthplace: Wisconsin
Occupation: none
Census place: Britt, Hancock, Iowa; Roll: T624_393; Page: 4B; Enumeration District: 130; Image: 319
Date: 19 Apr 1910

Extract from the 1920 Census:
Name: Martha A Heacox
Age: 37
Estimated birth year: 1883
Birthplace: Iowa
Race: white
Sex: female
Relationship to head of house: wife
Home in 1920: Britt, Hancock, Iowa
Address: Second Street
Marital status: married
Able to speak English: yes
Able to read and write: yes
Father's birthplace: Ohio
Mother's birthplace: Wisconsin
Occupation: none
Census place: Britt, Hancock, Iowa; Roll: T625_492; Page: 13B; Enumeration District: 143; Image: 114
Date: 13 Jan 1920

Extract from the 1930 Census:
Name: Martha A Heacox
Age: 46
Estimated birth year: 1884
Birthplace: Iowa
Race: white
Sex: female
Relation to head-of-house: wife
Home in 1930: Britt, Hancock, Iowa
Marital status: married
Age at first marriage: 21
Education: able to speak English
Education: able to read and write
Father's birthplace: Ohio
Mother's birthplace: Wisconsin
Occupation: none
Census place: Britt, Hancock, Iowa; Roll: 657; Page: ; Enumeration District: 9; Image: 705.0
Date: 17 Apr 1930

Extract from the 1940 Census:
Name: Mattie Heacox
Age: 56
Estimated birth year: 1884
Birthplace: Iowa
Race: white
Sex: female
Relation to head-of-house: wife
Home in 1940: Britt, Hancock, Iowa
Address: 255 3rd Street
Marital status: married
Highest grade of school completed: high school 3 years
Living on farm: no
Place of residence in 1935: same house
Occupation: housework
Has other income of more than $50: yes
Census place: Britt, Hancock, Iowa; Roll: T627_1164; Page: 8A; Enumeration District: 41-9
Date: Apr 1940

Extract from the 1950 Census:
Name: Mattie B Heacox
Age: 66
Estimated birth year: 1884
Birthplace: Iowa
Race: white
Sex: female
Relation to head-of-house: wife
Home in 1950: Britt, Hancock, Iowa
Address: 255 East 2nd Street
Marital status: married
Living on farm: no
Occupation: keeping house
Census place: Britt, Hancock, Iowa
Date: 13 Apr 1950

Her family nickname was "Mattie." She was born in Britt, Iowa, at Bailey's Grove. She was the wife of Dr Francis Eugene Heacox, a dentist in Britt, Hancock County, Iowa, near the Minnesota border. She was married 15 Jun 1904 in Britt. She outlived her husband "Doc" Heacox by nineteen years, reaching the age of 96.

Children:
(1) Edwin Francis Heacox
(2) Maynard Lucian Heacox
(3) Martha Adelaide Heacox.