MI
Mary Irwin — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Hendricks-County, Indiana
Our Model Tree links this Mary Irwin across the 1930 and 1940 US Censuses in Hendricks-County, Indiana (XGBoost, ~Confirmed) — first a daughter (b.~1929), then head of a 7-person household.
Age 11
b. ~1929
Female
Daughter
Born: Indiana
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Hendricks-County, Indiana |
| Surname | Irwin |
| Given Name | Mary Ann |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Indianapolis |
| 1935 Residence (County) | Marion |
| Additional Details | |
| Highest Grade | No 5 |
| 1935 Residence | Indiana |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
| Township / Ward | Middle Twp |
| Est. Birth Year | ~1929 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Irwin | Daughter | — | 11 | ~1929 |
| Patricia Williams | Other | — | 5 | ~1935 |
| May Williams | Daughter | — | 32 | ~1908 |
| Nell Irwin | Daughter | — | 21 | ~1919 |
| Anna Irwin | Spouse | — | 51 | ~1889 |
| Barbara Williams | Other | — | 8 | ~1932 |
| Burke Irwin | Head | — | 56 | ~1884 |
Census Appearances
1930
Marion, Indiana
Daughter, age 1
Marion, Indiana · implied b. ~1929 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Irwin |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Kansas |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1940
Hendricks-County, Indiana
Daughter, age 11
Hendricks-County, Indiana · implied b. ~1929 — 7 household members
| Surname | Irwin |
| Given Name | Mary Ann |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Indianapolis |
| 1935 Residence (County) | Marion |
| Highest Grade | No 5 |
| 1935 Residence | Indiana |
| 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 11 · b. ~1929 · Indiana
★ You are viewing this record
Sibling
Nell Irwin
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
May Williams
Sibling · 1940 · age 32
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 — Hendricks-County, Indiana
Open full size
1940 US Federal Census — Hendricks-County, Indiana
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01051-01016)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Josephine Hamm | 85 | aunt | — | Ohio |
| 2 | Nora D. Hicks | 63 | Head | — | Indiana |
| 3 | Leon J. Hicks | 24 | Son | Salesman | Indiana |
| 4 | James Hicks | 19 | Son | — | Indiana |
| 5 | Jesse Kirby | 35 | Head | Farmer | Tennessee |
| 6 | Ethel D. Kirby | 40 | Wife | — | Tennessee |
| 7 | Willie Kirby | 14 | Son | — | Tennessee |
| 8 | Lloyd Kirby | 13 | Son | — | Indiana |
| 9 | Alda Kirby | 11 | Daughter | — | Indiana |
| 10 | Alvah Kirby | 9 | Son | — | Indiana |
| 11 | Edna Kirby | 3 | Daughter | — | Indiana |
| 12 | Raymond R. Snyder | 55 | Head | Farmer | Indiana |
| 13 | Clifford A. Snyder | 37 | Son | Farmer | Indiana |
| 14 | Marie L. Snyder | 36 | Daughter-in-law | — | Indiana |
| 15 | Lucille Snyder | 9 | granddaughter | — | Indiana |
| 16 | Charles R. Muston | 68 | Head | Farmer | Indiana |
| 17 | Myrtle A. Muston | 63 | Wife | — | Indiana |
| 18 | Robert Muston | 24 | Son | Farmer | Indiana |
| 19 | Burke H. Irwin | 56 | Head | Operator | Indiana |
| 20 | Anna M. Irwin | 51 | Wife | — | Kansas |
| 21 | Nell Irwin | 21 | Daughter | — | Indiana |
| 22 | Mary Ann Irwin THIS PERSON | 11 | Daughter | — | Indiana |
| 23 | May J. Williams | 32 | Daughter | Cashier | Indiana |
| 24 | Barbara May Williams | 8 | granddaughter | — | Indiana |
| 25 | Patricia Ann Williams | 5 | granddaughter | — | Indiana |
| 26 | Osha D. Huffman | 49 | Head | Shipping Clerk | Indiana |
| 27 | Edith Huffman | 45 | Wife | Clerk | Indiana |
| 28 | Cecil Thompson | 44 | Head | Tool Designer | Indiana |
| 29 | Madeline Thompson | 33 | Wife | — | Colorado |
| 30 | Carol Ann Thompson | 2 | Daughter | — | Indiana |
| 31 | Ezra Holp | 63 | Head | Farmer | Indiana |
| 32 | Myrtle Holp | 60 | Wife | — | Indiana |
| 33 | Lillie May Jones | 79 | Lodger | — | Indiana |
| 34 | Susan Brown | 77 | Lodger | — | Indiana |
| 35 | Ernest Johnson | 39 | Head | Truck Driver | Indiana |
| 36 | Ellen Johnson | 34 | Wife | — | Indiana |
| 37 | Warren Johnson | 14 | Son | — | Indiana |
| 38 | Bernetta Johnson | 12 | Daughter | — | Indiana |
| 39 | Orion J. Hughes | 70 | Head | Farmer | Indiana |
| 40 | Allura Hughes | 66 | Wife | — | Indiana |
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)