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Mary Leahy — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Multnomah-County, Oregon
Our Model Tree links this Mary Leahy across the 1930 and 1940 US Censuses in Multnomah-County, Oregon (XGBoost, ~Confirmed) — first a spouse (b.~1899), then head of a 3-person household.
Age 41
b. ~1899
Female
Spouse
Born: South Dakota
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Multnomah-County, Oregon |
| Surname | Leahy |
| Given Name | Mary M. |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 41 |
| Marital Status | Married |
| Birthplace | South Dakota |
| 1935 Residence (City) | Portland City |
| Additional Details | |
| Industry | none |
| Class of Worker | none |
| Highest Grade | Hs 4 |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
| Township / Ward | Portland City |
| Est. Birth Year | ~1899 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Thomas Leahy | Head | — | 47 | ~1893 |
| Mary Leahy | Spouse | — | 41 | ~1899 |
| Thomas Leahy | Son | — | 6 | ~1934 |
Census Appearances
1930
Multnomah, Oregon
Other, age 30
Multnomah, Oregon · implied b. ~1900 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Leahy |
| Given Name | Mary M |
| Relationship to Head | daughter-in-law |
| Sex | F |
| Color / Race | White |
| Age | 30 |
| Marital Status | Married |
| Birthplace | South Dakota |
| Age at First Marriage | 28 |
| Father's Birthplace | Texas |
| Mother's Birthplace | Northumberland |
| Occupation | Stenographer |
| Industry | Drug Co. |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
1940
Multnomah-County, Oregon
Spouse, age 41
Multnomah-County, Oregon · implied b. ~1899 — 3 household members
| Surname | Leahy |
| Given Name | Mary M. |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 41 |
| Marital Status | Married |
| Birthplace | South Dakota |
| 1935 Residence (City) | Portland City |
| Industry | none |
| Class of Worker | none |
| Highest Grade | Hs 4 |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
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 Leahy across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Leahy
Spouse · 1940 · age 41 · b. ~1899 · Oregon
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Multnomah-County, Oregon
Open full size
1940 US Federal Census — Multnomah-County, Oregon
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03393-00354)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Patrick, Wayne B. Patrick | 2 | son | None | Oregon |
| 42 | Sharon M. Patrick | 0 | daughter | None | Oregon |
| 43 | Robert J. Chaffer | 25 | head | Electrical Repairing | Colorado |
| 44 | Lila W. Chaffer | 23 | wife | Saleslady | North Carolina |
| 45 | Lawrence Matack | 33 | head | Wholesale Oil | Oregon |
| 46 | Mildred E. Matack | 30 | wife | Retail Department Store | Oregon |
| 47 | August W. Engelking | 30 | head | Bonneville Dam | Washington D.C. |
| 48 | Edith D. Engelking | 27 | wife | None | Washington |
| 49 | Francis J. Smith | 37 | head | Salesman | Minnesota |
| 50 | Lenore D. Smith | 39 | wife | None | Washington |
| 51 | Patricia Smith | 9 | daughter | — | Washington |
| 52 | John B. Jeffrey | 27 | head | Wholesale Furniture | Scotland |
| 53 | Caroline Jeffrey | 27 | wife | — | England |
| 54 | Richard W. Jeffrey | 3 | son | — | Oregon |
| 55 | Charles W. Schad | 62 | head | Iron And Steel Company | Oregon |
| 56 | Matilda Schad | 60 | wife | — | Oregon |
| 57 | Lee C. Scott | 26 | head | Own Business | Nebraska |
| 58 | Bernice L. Scott | 26 | wife | — | Nebraska |
| 59 | — | None | — | — | — |
| 60 | Winifred Brayman | 54 | head | — | Oregon |
| 61 | George H. Overhalt | 63 | lodger | — | Pennsylvania |
| 62 | Viggo Damkier | 36 | head | Paper Mill | Denmark |
| 63 | Meta Damkier | 34 | wife | — | Denmark |
| 64 | Raymond Damkier | 6 | son | — | Oregon |
| 65 | Thomas A. Leahy | 47 | head | Gas And Oil Company | Oregon |
| 66 | Mary M. Leahy THIS PERSON | 41 | wife | — | South Dakota |
| 67 | Thomas J. Leahy | 6 | son | — | Oregon |
| 68 | David H. Johnson | 29 | head | City Police Department | Michigan |
| 69 | Margaret E. Johnson | 27 | wife | — | English Canada |
| 70 | David K. Johnson | 1 | son | — | Oregon |
| 71 | James L. Thomas | 49 | head | Locomotive Railroad | Washington |
| 72 | Hazel A. Thomas | 39 | wife | — | Washington |
| 73 | John T. Label | 40 | head | Printing Company | Oregon |
| 74 | Ann M. Label | 39 | wife | — | Oregon |
| 75 | Rolland J. Label | 16 | son | — | Oregon |
| 76 | Marlene N. Label | 6 | daughter | — | Oregon |
| 77 | — | None | — | — | — |
| 78 | Wesley B. Holbrook | 41 | head | Terminal Railway | Tennessee |
| 79 | Susan M. Holbrook | 40 | wife | — | Tennessee |
| 80 | Dorothy M. Holbrook | 17 | daughter | — | Illinois |
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)