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Mary Mckay — 1940 US Census Record
Linked across censuses1940 United States Federal Census · King-County, Washington
Our Model Tree links this Mary Mckay across the 1930 and 1940 US Censuses in King-County, Washington (XGBoost, ~Confirmed) — first a daughter (b.~1916), then head of a 6-person household.
Age 24
b. ~1916
Female
Daughter
Born: Washington
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | King-County, Washington |
| Surname | McKay |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Washington |
| 1935 Residence (City) | Seattle City |
| 1935 Residence (County) | King |
| Additional Details | |
| Occupation | typist |
| Industry | public utilities |
| Class of Worker | PW |
| Hours Worked | 30 |
| Income (1939) | 891 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
| Occupation | Typist |
| Township / Ward | Seattle City |
| Est. Birth Year | ~1916 |
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 |
|---|---|---|---|---|
| John Mckay | Son | — | 19 | ~1921 |
| John Mckay | Head | — | 74 | ~1866 |
| Margaret Mckay | Daughter | — | 35 | ~1905 |
| Elizabeth Mckay | Spouse | — | 63 | ~1877 |
| Claire Mckay | Daughter | — | 22 | ~1918 |
| Mary Mckay | Daughter | — | 24 | ~1916 |
Census Appearances
1930
King, Washington
Daughter, age 15
King, Washington · implied b. ~1915 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mc Kay |
| Given Name | Margaret L |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Washington |
| Father's Birthplace | Canada English |
| Mother's Birthplace | California |
| Can Read/Write | Yes |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
1940
King-County, Washington
Daughter, age 24
King-County, Washington · implied b. ~1916 — 6 household members
| Surname | McKay |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Washington |
| 1935 Residence (City) | Seattle City |
| 1935 Residence (County) | King |
| Occupation | typist |
| Industry | public utilities |
| Class of Worker | PW |
| Hours Worked | 30 |
| Income (1939) | 891 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
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.
Show:
This person
Anchor record
Mary Mckay
Daughter · 1940 · age 24 · b. ~1916 · Washington
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Sibling
Margaret Mckay
Sibling · 1940 · age 35
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Mckay
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Claire Mckay
Sibling · 1940 · age 22
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 — King-County, Washington
Open full size
1940 US Federal Census — King-County, Washington
Page Contents
38 people indexed on this census page (nara:1940:m-t0627-04380-00165)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Jeanine Conklin | 9 | daughter | — | Washington |
| 2 | Edward Lyons | 39 | Head | Proprietor | Dublin, Ireland |
| 3 | Elizabeth Lyons | 38 | wife | Attendant | Washington |
| 4 | Ellen Terry | 34 | Head | Stenographer | Michigan |
| 5 | Ida Barry | 67 | Head | Proprietor | Missouri |
| 6 | Winonah Nichols | 26 | lodger | Stenographer | Washington |
| 7 | Jack L. Silvain | 28 | Head | Clerical Clerk | Washington |
| 8 | Mildred Silvain | 32 | wife | — | N. Dakota |
| 9 | Bernice Mcconnell | 23 | lodger | Saleslady | N. Dakota |
| 10 | Edward Mott | 35 | Head | Driver | N. Dakota |
| 11 | Hazel Mott | 27 | wife | — | Washington |
| 12 | John Reinhardt | 29 | Head | Equipment Exploiter | Austria |
| 13 | Helen Reinhardt | 30 | wife | — | Minnesota |
| 14 | Wilson Parks | 35 | Head | Manager | Washington |
| 15 | Eulalie Parks | 36 | wife | — | Washington |
| 16 | Elizabeth Parks | 12 | daughter | — | Washington |
| 17 | Yvonne Lewis | 27 | Head | Assistant | Canada |
| 18 | Lee E. Curry | 54 | Head | Housekeeper | Nebraska |
| 19 | Orch E. O. Curry | 62 | lodger | Salesman | Missouri |
| 20 | William Hansard | 32 | lodger | Elevator Operator | Arkansas |
| 21 | Dorothy Shumacher | 24 | Head | Waitress | Washington |
| 22 | John C. Dresser | 44 | lodger | Florist | Germany |
| 23 | Ernest Adolph | 48 | Head | Contractor | Germany |
| 24 | Natalie Adolph | 33 | wife | — | Germany |
| 25 | Dorit Adolph | 2 | daughter | — | Washington |
| 26 | S. Sako | 58 | Head | Proprietor | Japan |
| 27 | Sawayo Sako | 43 | wife | — | Japan |
| 28 | Sodbo Sako | 21 | son | — | Washington |
| 29 | Jerry Sako | 19 | daughter | — | Washington |
| 30 | Hiroshi Sako | 15 | son | — | Washington |
| 31 | Saburo Sako | 13 | son | — | Washington |
| 32 | Julia Pawlovitch | 68 | Head | — | England |
| 33 | John D. Mckay | 74 | Head | — | Canada |
| 34 | Elizabeth Mckay | 63 | wife | — | Minnesota |
| 35 | Margaret Mckay | 35 | daughter | Bookkeeper | Washington |
| 36 | Mary Mckay THIS PERSON | 24 | daughter | Typist | Washington |
| 37 | Claire Mckay | 22 | daughter | Clerk | Washington |
| 38 | John L. Mckay | 19 | son | — | Washington |
Related Census Records
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)