MI
Mary Irwin — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Lucas-County, Ohio
Our Model Tree links this Mary Irwin across the 1930 and 1940 US Censuses in Lucas-County, Ohio (XGBoost, ~Confirmed) — first a daughter (b.~1923), then head of a 6-person household.
Age 17
b. ~1923
Female
Daughter
Born: Ohio
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Lucas-County, Ohio |
| Surname | Irwin |
| Given Name | Mary J. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Ohio |
| 1935 Residence (City) | Springfield Twp. |
| 1935 Residence (County) | Lucas |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | Hs 2 |
| 1935 Residence | Same place |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
| Township / Ward | Springfield Twp |
| Est. Birth Year | ~1923 |
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 |
|---|---|---|---|---|
| Fred Irwin | Son | — | 13 | ~1927 |
| Melvin Irwin | Son | — | 16 | ~1924 |
| Grace Irwin | Other | — | 51 | ~1889 |
| Ray Irwin | Head | — | 41 | ~1899 |
| Glen Irwin | Son | — | 10 | ~1930 |
| Mary Irwin | Daughter | — | 17 | ~1923 |
Census Appearances
1930
Lucas, Ohio
Daughter, age 7
Lucas, Ohio · implied b. ~1923 — 5 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 | 7 |
| Marital Status | Single |
| Birthplace | Ohio |
| Father's Birthplace | Canada-English |
| Mother's Birthplace | Ohio |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
1940
Lucas-County, Ohio
Daughter, age 17
Lucas-County, Ohio · implied b. ~1923 — 6 household members
| Surname | Irwin |
| Given Name | Mary J. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Ohio |
| 1935 Residence (City) | Springfield Twp. |
| 1935 Residence (County) | Lucas |
| Income (1939) | 0 |
| Highest Grade | Hs 2 |
| 1935 Residence | Same place |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
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 17 · b. ~1923 · Ohio
★ You are viewing this record
Sibling
Fred Irwin
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Glen Irwin
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Melvin Irwin
Sibling · 1940 · age 16
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 — Lucas-County, Ohio
Open full size
1940 US Federal Census — Lucas-County, Ohio
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03105-00806)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Robert Tafft | 8 | Son | — | Ohio |
| 2 | Emmett Holloway | 77 | Head | — | Ohio |
| 3 | Ora Holloway | 61 | Wife | — | Colorado |
| 4 | Paul Holloway | 37 | Head | Feeder | Ohio |
| 5 | Bernice Holloway | 35 | Wife | — | Michigan |
| 6 | Thomas Holloway | 9 | Son | — | Ohio |
| 7 | Richard Holloway | 7 | Son | — | Ohio |
| 8 | Phyllis Holloway | 3 | Daughter | — | Ohio |
| 9 | Rollin Irwin | 32 | Head | Cement Const | Ohio |
| 10 | Zelma Irwin | 32 | Wife | — | Ohio |
| 11 | Martha Irwin | 9 | Daughter | — | Ohio |
| 12 | Larry Irwin | 7 | Son | — | Ohio |
| 13 | Ray Irwin | 41 | Head | Farm Hand | Ohio |
| 14 | Mary J. Irwin THIS PERSON | 17 | Daughter | — | Ohio |
| 15 | Melvin Irwin | 16 | Son | — | Ohio |
| 16 | Fred Irwin | 13 | Son | — | Ohio |
| 17 | Glen Irwin | 10 | Son | — | Ohio |
| 18 | Grace Irwin | 51 | Sister | English Teacher | Ohio |
| 19 | Frank Towne | 49 | Head | Brick Layer | Ohio |
| 20 | Daisy Towne | 46 | Wife | — | Ohio |
| 21 | Marguerite Towne | 22 | Daughter | — | Ohio |
| 22 | Charlie Towne | 19 | Son | New Worker | Ohio |
| 23 | Henry J. Towne | 17 | Son | New Worker | Ohio |
| 24 | Edward Herroon | 51 | Head | Janitor | Michigan |
| 25 | Amalia Herroon | 59 | Wife | — | Hungary |
| 26 | Leo Herroon | 19 | Son | New Worker | Ohio |
| 27 | Agnes Herroon | 17 | Daughter | — | Ohio |
| 28 | Wilson Kachenmeister | 25 | Head | Truck Driver | Ohio |
| 29 | Alice Kachenmeister | 30 | Wife | — | Ohio |
| 30 | Franklin Baker | 25 | Head | Storage Clerk | Ohio |
| 31 | Evelyn Baker | 24 | Wife | — | Ohio |
| 32 | Diane Baker | 1 | Daughter | — | Ohio |
| 33 | Otto Wulff | 52 | Head | Boiler Maker | Illinois |
| 34 | Lila Wulff | 43 | Wife | — | Illinois |
| 35 | Otto Jr. Wulff | 17 | Son | — | Illinois |
| 36 | Nolan England | 52 | Head | Laborer | Ohio |
| 37 | Myrtle England | 52 | Wife | — | Ohio |
| 38 | Roy Tahree | 51 | Head | Car Loader | Ohio |
| 39 | Hazel Tahree | 41 | Wife | — | Ohio |
| 40 | Harry Welling | 39 | Head | Truck Driver | Ohio |
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)