MI
Mary Irwin — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Montgomery-County, Indiana
Our Model Tree links this Mary Irwin across the 1930 and 1940 US Censuses in Montgomery-County, Indiana (XGBoost, ~Confirmed) — first a daughter (b.~1922), then head of a 6-person household.
Age 18
b. ~1922
Female
Daughter
Born: Indiana
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Montgomery-County, Indiana |
| Surname | Irwin |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Sugar Creek Township |
| 1935 Residence (County) | Montgomery |
| Additional Details | |
| Industry | 20 |
| Highest Grade | H-3 |
| 1935 Residence | Same place |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
| Township / Ward | Sugar Creek Township |
| Est. Birth Year | ~1922 |
Household Members
Census records only state relationship to the household head.
Pairwise kinship is derived (~90–95% accurate), not recorded.
Step/blended families and boarders can break it.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Robert Irwin | Son | — | 14 | ~1926 |
| Annie Irwin | Spouse | — | 48 | ~1892 |
| Adah Irwin | Daughter | — | 11 | ~1929 |
| James Irwin | Son | — | 21 | ~1919 |
| Mary Irwin | Daughter | — | 18 | ~1922 |
| James Irwin | Head | — | 54 | ~1886 |
Census Appearances
1930
Montgomery, Indiana
Daughter, age 8
Montgomery, Indiana · implied b. ~1922 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Irwin |
| Given Name | Mary L. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1940
Montgomery-County, Indiana
Daughter, age 18
Montgomery-County, Indiana · implied b. ~1922 — 6 household members
| Surname | Irwin |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Sugar Creek Township |
| 1935 Residence (County) | Montgomery |
| Industry | 20 |
| Highest Grade | H-3 |
| 1935 Residence | Same place |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
Model Tree
An inferred pedigree reconstructed from census links — up to 4 generations within the 1900–1950 window. Closer generations are built from household co-residence; deeper ones are bridged by following a relative to their own childhood census. Confidence compounds and weakens with each generation.
Our Model Tree links Mary Irwin across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Irwin
Daughter · 1940 · age 18 · b. ~1922 · Indiana
★ You are viewing this record
Sibling
James Irwin
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Irwin
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Adah Irwin
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Montgomery-County, Indiana
Open full size
1940 US Federal Census — Montgomery-County, Indiana
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01080-00305)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Margery Pate | 29 | wife | — | Indiana |
| 2 | John Pate | 78 | father | — | Indiana |
| 3 | L. E. Wingert | 48 | Head | Farm Laborer | Indiana |
| 4 | Rose Wingert | 47 | wife | — | Indiana |
| 5 | Paul Wingert | 19 | son | Farm Laborer | Indiana |
| 6 | Richard Halton | 32 | Head | Farm Laborer | Indiana |
| 7 | Gladys Halton | 30 | wife | — | Illinois |
| 8 | Marvin Halton | 10 | son | — | Indiana |
| 9 | Martha Halton | 6 | daughter | — | Indiana |
| 10 | Aden F. Lovelace | 56 | Head | Farm Laborer | Indiana |
| 11 | Esther Lovelace | 53 | wife | — | Indiana |
| 12 | Haven Lovelace | 21 | son | Wiring Houses | Indiana |
| 13 | Leonard Lovelace | 18 | son | — | Indiana |
| 14 | Kenneth Lovelace | 16 | son | — | Indiana |
| 15 | Joe Ann Mangus | 9 | daughter | — | Indiana |
| 16 | Cloyd Mangus | 7 | grandson | — | Indiana |
| 17 | James Irwin | 54 | Head | Farm Laborer | Indiana |
| 18 | Annie Irwin | 48 | wife | — | Indiana |
| 19 | James Junior Irwin | 21 | son | Farm Laborer | Indiana |
| 20 | Mary Irwin THIS PERSON | 18 | daughter | — | Indiana |
| 21 | Robert Irwin | 14 | son | — | Indiana |
| 22 | Adah Irwin | 11 | daughter | — | Indiana |
| 23 | William S. Cook | 72 | Head | Farm Laborer | Indiana |
| 24 | Alice Cook | 72 | wife | — | Indiana |
| 25 | Cline Mangus | 36 | Head | Farm Laborer | Indiana |
| 26 | Rachael Mangus | 28 | wife | — | Indiana |
| 27 | Bertha Peterson | 8 | step-daughter | — | Indiana |
| 28 | Gwyneth Mangus | 3 | step-daughter | — | Indiana |
| 29 | Alta Neil Mangus | 2 | daughter | — | Indiana |
| 30 | Harry Alan Mangus | 1 | son | — | Indiana |
| 31 | Michael Ludwig Mangus | 0 | son | — | Indiana |
| 32 | William O. Ormsby | 83 | Head | — | Kentucky |
| 33 | Frances Eugene Ormsby | 55 | son | Farm Laborer | Indiana |
| 34 | Martha G. Gilmore | 46 | daughter | — | Indiana |
| 35 | John Gilmore | 23 | grandson | Farm Laborer | Indiana |
| 36 | Charles Eugene Gilmore | 16 | grandson | — | Indiana |
| 37 | Robert Horney | 38 | Head | Farm Laborer | Indiana |
| 38 | Audra Horney | 41 | sister | — | Indiana |
| 39 | Berry Purdue | 28 | Head | Pole Climber | Tennessee |
| 40 | Flora Purdue | 22 | wife | — | Tennessee |
Related Census Records
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1940 United States Federal Census (NARA). Our Model Tree links this person across census decades using XGBoost-based record linkage, with per-link confidence scores. Household corroboration strengthens the signal when co-residents appear on the same census pages in multiple years.
Source: National Archives and Records Administration (NARA)