JM
James Mckay — 1940 US Census Record
Linked across censuses1940 United States Federal Census · King-County, Washington
Our Model Tree links this James Mckay across the 1930 and 1940 US Censuses in King-County, Washington (XGBoost, ~Confirmed) — first a son (b.~1929), then head of a 15-person household.
Age 11
b. ~1929
Male
Son
Born: Washington
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | King-County, Washington |
| Surname | McKay |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Washington |
| 1935 Residence (City) | Seattle City |
| 1935 Residence (County) | King |
| Additional Details | |
| Highest Grade | No 6 |
| 1935 Residence | Same House |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
| Township / Ward | Seattle City |
| Est. Birth Year | ~1929 |
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.
15 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| Mary Mckay | Daughter | — | 10 | ~1930 |
| Caroline Mckay | Daughter | — | 3 | ~1937 |
| James Mckay | Son | — | 11 | ~1929 |
| Martha Mckay | Daughter | — | 8 | ~1932 |
| Margaret Mckay | Daughter | — | 8 | ~1932 |
| Thomas Mckay | Son | — | 1 | ~1939 |
| Matthew Mckay | Son | — | 5 | ~1935 |
| John Mckay | Son | — | 18 | ~1922 |
| Michael Mckay | Son | — | 13 | ~1927 |
| John Mckay | Head | — | 59 | ~1881 |
| Harold Mckay | Son | — | 14 | ~1926 |
| Gerald Mckay | Son | — | 6 | ~1934 |
| Gertrude Mckay | Spouse | — | 59 | ~1881 |
| Victor Mckay | Son | — | 16 | ~1924 |
| Stephen Mckay | Son | — | 1 | ~1939 |
Census Appearances
1930
King, Washington
Son, age
King, Washington · implied b. ~1930 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mackey |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Washington |
| Father's Birthplace | Michigan |
| Mother's Birthplace | Michigan |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
1940
King-County, Washington
Son, age 11
King-County, Washington · implied b. ~1929 — 15 household members
| Surname | McKay |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Washington |
| 1935 Residence (City) | Seattle City |
| 1935 Residence (County) | King |
| Highest Grade | No 6 |
| 1935 Residence | Same House |
| 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 James Mckay across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
James Mckay
Son · 1940 · age 11 · b. ~1929 · Washington
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Sibling
Mary Mckay
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Mckay
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Harold Mckay
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Martha Mckay
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Gerald Mckay
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Michael Mckay
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Victor Mckay
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Mckay
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Stephen Mckay
Sibling · 1940 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Caroline Mckay
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Mckay
Sibling · 1940 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Matthew Mckay
Sibling · 1940 · age 5
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
39 people indexed on this census page (nara:1940:m-t0627-04381-00046)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Angeline A. Lewis | 64 | Head | Rooming House | Wisconsin |
| 2 | Frank Little | 72 | Lodger | Janitor | Pennsylvania |
| 3 | Francis B. Thwaites | 56 | Lodger | Field Supervisor | England |
| 4 | William Revell | 34 | Lodger | Taxi Driver | England |
| 5 | James Vargas | 43 | Lodger | Cabinet Maker | Italy |
| 6 | James R. Whitaker | 33 | Lodger | No | U.S. |
| 7 | William Dreesen | 60 | Lodger | No | Holland |
| 8 | Henry W. Linke | 57 | Head | Manager | Germany |
| 9 | John Mckay | 59 | Head | Printer | Massachusetts |
| 10 | Gertrude Mckay | 59 | Wife | No | Minnesota |
| 11 | John Jr. Mckay | 18 | Son | Route Manager | Washington |
| 12 | Victor Mckay | 16 | Son | Printer | Washington |
| 13 | Harold Mckay | 14 | Son | Delivery Boy | Washington |
| 14 | Michael Mckay | 13 | Son | — | Washington |
| 15 | James Mckay THIS PERSON | 11 | Son | — | Washington |
| 16 | Mary Mckay | 10 | Daughter | — | Washington |
| 17 | Margaret Mckay | 8 | Daughter | — | Washington |
| 18 | Martha Mckay | 8 | Daughter | — | Washington |
| 19 | Gerald Mckay | 6 | Son | — | Washington |
| 20 | Matthew Mckay | 5 | Son | — | Washington |
| 21 | Caroline Mckay | 3 | Daughter | — | Washington |
| 22 | Thomas Mckay | 1 | Son | — | Washington |
| 23 | Stephen Mckay | 1 | Son | — | Washington |
| 24 | Thomas Peterson | 64 | Head | No | Iowa |
| 25 | William Anicich | 45 | Head | Booker & Seller | Washington |
| 26 | Grace M. Anicich | 53 | Wife | No | Iowa |
| 27 | John M. Boan | 63 | Head | No | Missouri |
| 28 | Gilman Ness | 33 | Head | No | North Dakota |
| 29 | James F. Wynbavery | 66 | Head | No | Massachusetts |
| 30 | Ola L. Turvey | 76 | Head | No | Iowa |
| 31 | Ralph Levens | 35 | Head | Breaker | Washington |
| 32 | Sylvia Levens | 35 | Wife | No | North Dakota |
| 33 | Annie L. Cumbow | 69 | Head | No | Michigan |
| 34 | Katherine Jeffords | 66 | Head | No | Michigan |
| 35 | Cornelious Kahl | 76 | Head | No | Norway |
| 36 | Roy Pierce | 33 | Head | Musician | Hawaii |
| 37 | Arlene Pierce | 25 | Wife | No | Washington |
| 38 | Mickie Mccabbin | 43 | Head | No | Missouri |
| 39 | Leah Grover | 39 | Head | Seamstress | New York |
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)