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Mary Mckay — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Wheatland-County, Montana
Our Model Tree links this Mary Mckay across the 1920, 1930 and 1940 US Censuses in Wheatland-County, Montana (XGBoost, ~Confirmed) — first a spouse (b.~1879), then head of a 8-person household.
Age 61
b. ~1879
Female
Spouse
Born: Scotland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Wheatland-County, Montana |
| Surname | McKay |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 61 |
| Marital Status | Married |
| Birthplace | Scotland |
| 1935 Residence (City) | District 32, Rossville |
| 1935 Residence (County) | Wheatland |
| Naturalization Status | Naturalized |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | S 8 |
| 1935 Residence | Same place |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
| Township / Ward | District 32 Rossville |
| Est. Birth Year | ~1879 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Harold Whitner | Other | — | 55 | ~1885 |
| Thomas Glennis | Other | — | 5 | ~1935 |
| Jack Downs | Other | — | 71 | ~1869 |
| Mary Mckay | Spouse | — | 61 | ~1879 |
| Margaret Mckay | Daughter | — | 32 | ~1908 |
| Angus Mckay | Head | — | 61 | ~1879 |
| Anthony Haler | Other | — | 31 | ~1909 |
| Edwin Nelson | Other | — | 47 | ~1893 |
Census Appearances
1920
Wheatland, Montana
Spouse, age 42
Wheatland, Montana · implied b. ~1878 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McKay |
| Given Name | Mabel M |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 42 |
| Marital Status | Married |
| Birthplace | Scotland |
| Year of Immigration | 1903 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Scotch |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
1930
Wheatland, Montana
Spouse, age 52
Wheatland, Montana · implied b. ~1878 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McKay |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 52 |
| Marital Status | Married |
| Birthplace | Scotland |
| Year of Immigration | 1901 |
| Age at First Marriage | 21 |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
1940
Wheatland-County, Montana
Spouse, age 61
Wheatland-County, Montana · implied b. ~1879 — 8 household members
| Surname | McKay |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 61 |
| Marital Status | Married |
| Birthplace | Scotland |
| 1935 Residence (City) | District 32, Rossville |
| 1935 Residence (County) | Wheatland |
| Naturalization Status | Naturalized |
| Class of Worker | 0 |
| Highest Grade | S 8 |
| 1935 Residence | Same place |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
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 Mckay across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Mckay
Spouse · 1940 · age 61 · b. ~1879 · Montana
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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 — Wheatland-County, Montana
Open full size
1940 US Federal Census — Wheatland-County, Montana
Page Contents
35 people indexed on this census page (nara:1940:m-t0627-02233-00614)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Krein Hoogshagen | 57 | Head | Farmer | Holland |
| 2 | Gertrude Hoogshagen | 52 | Wife | — | South Dakota |
| 3 | Kirk Hamer | 28 | Head | Farmer | Illinois |
| 4 | Helen Hamer | 19 | Wife | — | Montana |
| 5 | William Mcelvain | 49 | Head | Farmer | Iowa |
| 6 | Rolland Mcelvain | 47 | Brother | Farmer | Iowa |
| 7 | E. D. Mcelvain | 82 | Father | — | Missouri |
| 8 | Frederick Payne | 58 | Lodger | Hired Hand | Iowa |
| 9 | Howard Austin | 73 | Lodger | — | Montana |
| 10 | Alex Cummings | 49 | Head | Farmer | Scotland |
| 11 | William Mcdonald | 59 | Lodger | Hired Hand | Canada-English |
| 12 | Mose Caldwell | 54 | Head | Farmer | Idaho |
| 13 | Josephine Caldwell | 50 | Wife | — | Kansas |
| 14 | John Ross | 85 | Head | Farmer | Scotland |
| 15 | James Ross | 48 | Son | Farmer | Montana |
| 16 | John Watson | 34 | Lodger | Hired Hand | Texas |
| 17 | Axel Alm | 69 | Head | Farmer | Sweden |
| 18 | Mary Alm | 65 | Wife | — | Pennsylvania |
| 19 | Harold Diltman | 27 | Head | Farmer | Pennsylvania |
| 20 | Dora Donald | 69 | Housekeeper | Housekeeper | Scotland |
| 21 | Henry Van Ammen | 50 | Head | Farmer | Michigan |
| 22 | Ralph Lilley | 32 | Head | Hired Hand | Pennsylvania |
| 23 | Mary Lilley | 25 | Wife | — | Montana |
| 24 | Nancy Lilley | 3 | Daughter | — | Montana |
| 25 | Gustav Benson | 49 | Head | Farmer | South Dakota |
| 26 | Anne Benson | 47 | Wife | — | Kansas |
| 27 | Angus Mckay | 61 | Head | Farmer | Scotland |
| 28 | Mary Mckay THIS PERSON | 61 | Wife | — | Scotland |
| 29 | Margaret Mckay | 32 | Daughter | — | Scotland |
| 30 | Thomas Glennis | 5 | Grandson | — | Montana |
| 31 | Jack Downs | 71 | Lodger | Hired Hand | Scotland |
| 32 | Anthony Haler | 31 | Lodger | Hired Hand | Wisconsin |
| 33 | Edwin Nelson | 47 | Lodger | Hired Hand | Wisconsin |
| 34 | Harold Whitner | 55 | Lodger | Hired Hand | Ohio |
| 35 | William Haskell | 53 | Head | Hired Manager | Michigan |
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)