MI
Mary Irwin — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Westmoreland-County, Pennsylvania
Our Model Tree links this Mary Irwin across the 1930 and 1940 US Censuses in Westmoreland-County, Pennsylvania (XGBoost, ~Confirmed) — first a daughter (b.~1930), then head of a 9-person household.
Age 10
b. ~1930
Female
Daughter
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Westmoreland-County, Pennsylvania |
| Surname | Irwin |
| Given Name | Mary J |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Westmd Penna |
| 1935 Residence (County) | Westmoreland |
| Additional Details | |
| Highest Grade | No 3 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Township / Ward | Brenizer |
| Est. Birth Year | ~1930 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Eldge Irwin | Other | — | 26 | ~1914 |
| Wendall Irwin | Son | — | 2 | ~1938 |
| Lucille Irwin | Other | — | 23 | ~1917 |
| Beverly Irwin | Other | — | 4 | ~1936 |
| Mary Irwin | Spouse | — | 26 | ~1914 |
| Mary Irwin | Daughter | — | 10 | ~1930 |
| Kenneth Irwin | Son | — | 4 | ~1936 |
| Donald Irwin | Son | — | 8 | ~1932 |
| Merle Irwin | Head | — | 31 | ~1909 |
Census Appearances
1930
Westmoreland, Pennsylvania
Daughter, age
Westmoreland, Pennsylvania · implied b. ~1930 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Irwin |
| Given Name | Mary J |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Westmoreland-County, Pennsylvania
Daughter, age 10
Westmoreland-County, Pennsylvania · implied b. ~1930 — 9 household members
| Surname | Irwin |
| Given Name | Mary J |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Westmd Penna |
| 1935 Residence (County) | Westmoreland |
| Highest Grade | No 3 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
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 10 · b. ~1930 · Pennsylvania
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Sibling
Donald Irwin
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Kenneth Irwin
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Wendall Irwin
Sibling · 1940 · age 2
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 — Westmoreland-County, Pennsylvania
Open full size
1940 US Federal Census — Westmoreland-County, Pennsylvania
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-03629-00238)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | John B Garella | 43 | Head | Coal Miner | Italy |
| 42 | Theresa Garella | 37 | Wife | — | France |
| 43 | Domenic Garella | 17 | son | New Worker | Pennsylvania |
| 44 | Margaret Garella | 14 | daughter | — | Pennsylvania |
| 45 | Edward Servino | 27 | Head | Labour | Pennsylvania |
| 46 | Mary Servino | 21 | Wife | — | Pennsylvania |
| 47 | Joyce Servino | 1 | daughter | — | Pennsylvania |
| 48 | William Rankin | 58 | Head | Coal Miner | Pennsylvania |
| 49 | Mary Rankin | 53 | Wife | — | Switzerland |
| 50 | Alma Rankin | 35 | daughter | School Teacher | Pennsylvania |
| 51 | Allen Rankin | 25 | son | Attendant | Pennsylvania |
| 52 | Anna Rankin | 21 | daughter | — | Pennsylvania |
| 53 | Alice Rankin | 19 | daughter | — | Pennsylvania |
| 54 | Juanita Rankin | 15 | daughter | — | Pennsylvania |
| 55 | Merle Q Irwin | 31 | Head | Coal Miner | Pennsylvania |
| 56 | Mary Irwin | 26 | Wife | — | Pennsylvania |
| 57 | Mary J Irwin THIS PERSON | 10 | daughter | — | Pennsylvania |
| 58 | Donald Irwin | 8 | son | — | Pennsylvania |
| 59 | Kenneth Irwin | 4 | son | — | Pennsylvania |
| 60 | Wendall Irwin | 2 | son | — | Pennsylvania |
| 61 | Eldge Irwin | 26 | Bro. | Crane Operator | Pennsylvania |
| 62 | Lucille Irwin | 23 | Sister in L | — | Ohio |
| 63 | Beverly Irwin | 4 | Niece | — | Ohio |
| 64 | Joe Mazola | 38 | Head | Coal Miner | Pennsylvania |
| 65 | Louis Sadecky | 57 | Boarder | Coal Miner | Hungary |
| 66 | Herman Wiley | 59 | Head | Farmer | Pennsylvania |
| 67 | Jennie Wiley | 59 | Wife | — | Pennsylvania |
| 68 | Margaret Casner | 65 | Head | — | Pennsylvania |
| 69 | Wayne Casner | 27 | son | Farmer | Pennsylvania |
| 70 | Helen Casner | 21 | daughter | — | Pennsylvania |
| 71 | William Casner | 3 | grandson | — | Pennsylvania |
| 72 | James Casner | 1 | grandson | — | Pennsylvania |
| 73 | Edward Camel | 30 | Head | Coal Miner | Pennsylvania |
| 74 | Grace Camel | 23 | Wife | — | Pennsylvania |
| 75 | Edward Camel | 3 | son | — | Pennsylvania |
| 76 | Clyde Reprod | 26 | Head | Coal Miner | Pennsylvania |
| 77 | Hazel Reprod | 25 | wife | — | Pennsylvania |
| 78 | Elizabeth Reprod | 3 | daughter | — | Pennsylvania |
| 79 | Clyde Jr Reprod | 2 | son | — | Pennsylvania |
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)