MI
Mary Irwin — 1940 US Census Record
Model Tree available1940 United States Federal Census · Marion-County, Indiana
Our Model Tree links this Mary Irwin across the 1920, 1930 and 1940 US Censuses in Marion-County, Indiana (XGBoost, ~Confirmed), with identified parents Harry & Bertha — first a daughter (b.~1919), then head of a 5-person household.
Age 21
b. ~1919
Female
Daughter
Born: Indiana
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Marion-County, Indiana |
| Surname | Irwin |
| Given Name | Mary E |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Indianapolis City |
| 1935 Residence (County) | Marion |
| Additional Details | |
| Occupation | Clerk |
| Industry | Life Ins Co |
| Class of Worker | PW |
| Income (1939) | 750 |
| Highest Grade | H 3 |
| 1935 Residence | Same place |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
| Occupation | Clerk |
| Township / Ward | Indianapolis City |
| Est. Birth Year | ~1919 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Bertha Irwin | Spouse | — | 45 | ~1895 |
| Harry Irwin | Head | — | 50 | ~1890 |
| Robert Irwin | Son | — | 24 | ~1916 |
| Richard Irwin | Son | — | 23 | ~1917 |
| Mary Irwin | Daughter | — | 21 | ~1919 |
Census Appearances
1920
Marion, Indiana
Daughter, age
Marion, Indiana · implied b. ~1920 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Irwin |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1930
Marion, Indiana
Daughter, age 10
Marion, Indiana · implied b. ~1920 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Irwin |
| Given Name | Mary E |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1940
Marion-County, Indiana
Daughter, age 21
Marion-County, Indiana · implied b. ~1919 — 5 household members
| Surname | Irwin |
| Given Name | Mary E |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Indianapolis City |
| 1935 Residence (County) | Marion |
| Occupation | Clerk |
| Industry | Life Ins Co |
| Class of Worker | PW |
| Income (1939) | 750 |
| 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 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Harry Irwin (~0.92 confidence) and mother Bertha Irwin (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Harry Irwin
b. ~1890
Source father
● Household
· direct · ~0.92
Mother
Bertha Irwin
b. ~1895
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Irwin
Daughter · 1940 · age 21 · b. ~1919 · Indiana
★ You are viewing this record
Sibling
Richard Irwin
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Irwin
Sibling · 1940 · age 24
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 — Marion-County, Indiana
Open full size
1940 US Federal Census — Marion-County, Indiana
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01130-00824)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Thurlow York | 15 | Son | — | Indiana |
| 2 | Leo K York | 11 | Son | — | Indiana |
| 3 | Herbert Cullison | 35 | Head | Truck Driver | Indiana |
| 4 | Thelma Cullison | 35 | Wife | — | Indiana |
| 5 | Donald Cullison | 5 | Son | — | Indiana |
| 6 | Lois Moore | 23 | Roomer | Laundry | Indiana |
| 7 | Ada Griffin | 26 | Roomer | Maid | Indiana |
| 8 | Roy E Hamilton | 31 | Head | Plasterer | Indiana |
| 9 | Alice Hamilton | 29 | Wife | — | Indiana |
| 10 | Alice Hamilton | 12 | Daughter | — | Indiana |
| 11 | Helen Hamilton | 9 | Daughter | — | Indiana |
| 12 | Robert T Hamilton | 8 | Son | — | Indiana |
| 13 | Roy D Brown | 34 | Head | Plumber | Indiana |
| 14 | Hazel Brown | 32 | Wife | — | Indiana |
| 15 | Roy Jr Brown | 14 | Son | — | Indiana |
| 16 | Alvin Brown | 12 | Son | — | Indiana |
| 17 | Dorothy Brown | 10 | Daughter | — | Indiana |
| 18 | Ernest Brown | 6 | Son | — | Indiana |
| 19 | Marilyn Brown | 3 | Daughter | — | Indiana |
| 20 | Fred T Chaney | 60 | Head | Peddler | Indiana |
| 21 | Vinnie Chaney | 54 | Wife | — | Indiana |
| 22 | Ernest T Bender | 23 | Head | Pattern Maker | Indiana |
| 23 | Ruby M Bender | 21 | Wife | — | Virginia |
| 24 | Phillip E Bender | 1 | Son | — | Indiana |
| 25 | Robt F Irwin | 74 | Head | — | Indiana |
| 26 | Mary E Irwin | 66 | Wife | — | Indiana |
| 27 | Harry C Irwin | 50 | Head | Milk Route | Indiana |
| 28 | Bertha Irwin | 45 | Wife | — | Indiana |
| 29 | Robert Irwin | 24 | Son | Polisher | Indiana |
| 30 | Richard Irwin | 23 | Son | Roller Skater | Indiana |
| 31 | Mary E Irwin THIS PERSON | 21 | Daughter | Clerk | Indiana |
| 32 | Raymond Bragg | 50 | Head | Lather | Indiana |
| 33 | Hattie Bragg | 48 | Wife | — | Indiana |
| 34 | Frank Eller | 10 | Nephew | — | Indiana |
| 35 | John W Murphy | 40 | Head | Car Inspector | Illinois |
| 36 | Adeline Murphy | 38 | Wife | — | Missouri |
| 37 | Robt Murphy | 19 | Son | Clerk | Illinois |
| 38 | Sara I Huxley | 65 | Head | — | Ohio |
| 39 | John S Horach | 53 | Boarder | — | Ohio |
| 40 | Jacob Ganz | 31 | Head | Clerk | Wisconsin |
Pedigree Summary
Mary + 2 siblings
Gen 1 · 2 parents
~0.92
Max depth 4 (1900–1950 window)
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)