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Mary Mckay — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Alameda-County, California
Our Model Tree links this Mary Mckay across the 1930 and 1940 US Censuses in Alameda-County, California (XGBoost, ~Confirmed) — first a spouse (b.~1900), then head of a 5-person household.
Age 40
b. ~1900
Female
Spouse
Born: Scotland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Alameda-County, California |
| Surname | McKay |
| Given Name | Mary R. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Scotland |
| 1935 Residence (City) | Hayward City |
| 1935 Residence (County) | Alameda |
| Naturalization Status | Naturalized |
| Additional Details | |
| Hours Worked | 0 |
| Income (1939) | 0 |
| Highest Grade | C 2 |
| 1935 Residence | Same place |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
| Township / Ward | Hayward City |
| Est. Birth Year | ~1900 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Nancy Mckay | Daughter | — | 11 | ~1929 |
| Neil Mckay | Son | — | 7 | ~1933 |
| John Mckay | Head | — | 46 | ~1894 |
| Mary Mckay | Spouse | — | 40 | ~1900 |
| John Mckay | Son | — | 8 | ~1932 |
Census Appearances
1930
Alameda, California
Spouse, age 31
Alameda, California · implied b. ~1899 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mackay |
| Given Name | Mary M. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | Scotland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1901 |
| Age at First Marriage | 18 |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
1940
Alameda-County, California
Spouse, age 40
Alameda-County, California · implied b. ~1900 — 5 household members
| Surname | McKay |
| Given Name | Mary R. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Scotland |
| 1935 Residence (City) | Hayward City |
| 1935 Residence (County) | Alameda |
| Naturalization Status | Naturalized |
| Hours Worked | 0 |
| Income (1939) | 0 |
| Highest Grade | C 2 |
| 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 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Mckay
Spouse · 1940 · age 40 · b. ~1900 · California
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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 — Alameda-County, California
Open full size
1940 US Federal Census — Alameda-County, California
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00184-00086)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Louise Duarte | 28 | Wife | — | California |
| 2 | Jeannette Duarte | 1 | Daughter | — | California |
| 3 | William Duarte | 0 | Son | — | California |
| 4 | William Devita | 44 | Head | Gardner | Italy |
| 5 | Agnes Devita | 44 | Wife | — | Italy |
| 6 | Valda Devita | 18 | Daughter | Sorter | Italy |
| 7 | Lino Devita | 15 | Son | Picker | California |
| 8 | James Devita | 7 | Son | — | California |
| 9 | Joseph Cervantes | 71 | Head | — | Spain |
| 10 | Elizabeth Cervantes | 67 | Wife | — | Spain |
| 11 | Madeline Cervantes | 23 | Daughter | Beauty Operator | California |
| 12 | Frank Cervantes | 22 | Son | Hand Trucker | California |
| 13 | Joseph Kemas | 29 | Head | Cartoon Worker | California |
| 14 | Edith Kemas | 29 | Wife | — | California |
| 15 | Irene Kemas | 3 | Daughter | — | California |
| 16 | Ronald Kemas | 2 | Son | — | California |
| 17 | Antonio Ortiz | 64 | Head | — | Spain |
| 18 | Felicia Ortiz | 63 | Wife | — | Spain |
| 19 | Antonio Ortiz | 31 | Son | Cement Mixer | California |
| 20 | Wilfred Moller | 29 | Head | Shipping Clerk | England |
| 21 | Phyllis Moller | 28 | Wife | — | California |
| 22 | — | None | — | — | — |
| 23 | Rufino Garde | 40 | Head | Carpenter Helper | Spain |
| 24 | Virginia Garde | 32 | Wife | Sorter | Spain |
| 25 | Alice Garde | 10 | Daughter | — | California |
| 26 | Inez Garde | 2 | Daughter | — | California |
| 27 | Albert Kachler | 79 | Head | — | California |
| 28 | Ovidio Alves | 40 | Head | Tree Surgeon | Nebraska |
| 29 | Mary F. Alves | 28 | Wife | — | Nebraska |
| 30 | Bessy M. Alves | 17 | Daughter | — | Nebraska |
| 31 | Winona M. Alves | 15 | Daughter | — | Nebraska |
| 32 | Sankey V. Adams | 52 | Head | Traveling Salesman | Illinois |
| 33 | Clara Adams | 44 | Wife | — | South Dakota |
| 34 | Lester Hulbert | 14 | Step-son | — | California |
| 35 | John Mckay | 46 | Head | Refrigerating Engineer | Scotland |
| 36 | Mary R. Mckay THIS PERSON | 40 | Wife | — | Scotland |
| 37 | Nancy Mckay | 11 | Daughter | — | California |
| 38 | John Mckay | 8 | Son | — | California |
| 39 | Neil Mckay | 7 | Son | — | California |
| 40 | Florinus Cordeiro | 36 | Head | Office Manager | California |
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)