WM
William Mckay — 1940 US Census Record
Model Tree available1940 United States Federal Census · King-County, Washington
Our Model Tree links this William Mckay across the 1920, 1930 and 1940 US Censuses in King-County, Washington (XGBoost, ~Confirmed), with identified parents David & Emma — first a head (b.~1900), then head of a 5-person household.
Age 40
b. ~1900
Male
Head
Born: Alaska
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | King-County, Washington |
| Surname | McKay |
| Given Name | William A. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Alaska |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Kitsap |
| Additional Details | |
| Occupation | Locomotive fireman |
| Industry | Railroad |
| Class of Worker | PW |
| Hours Worked | 50 |
| Income (1939) | 1500 |
| Highest Grade | H-2 |
| 1935 Residence | Washington |
| Birth State | Alaska |
| Birth Country | United States |
| Birthplace (normalized) | alaska |
| Occupation | Locomotive Fireman |
| Township / Ward | Aaron Ed |
| 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 William | Age | Birth yr |
|---|---|---|---|---|
| Lois Mckay | Daughter | — | 13 | ~1927 |
| William Mckay | Son | — | 4 | ~1936 |
| Iris Mckay | Daughter | — | 15 | ~1925 |
| Marian Mckay | Spouse | — | 42 | ~1898 |
| William Mckay | Head | — | 40 | ~1900 |
Census Appearances
1920
King, Washington
Son, age 20
King, Washington · implied b. ~1900 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McKay |
| Given Name | Wm A |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Alaska |
| Father's Birthplace | Canada |
| Mother's Birthplace | California |
| Occupation | Fireman |
| Industry | N.P.R.R. |
| Class of Worker | W |
| Can Read | No |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Eng |
| Birth State | Alaska |
| Birth Country | United States |
| Birthplace (normalized) | alaska |
1930
King, Washington
Son, age 30
King, Washington · implied b. ~1900 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McKay |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Single |
| Birthplace | Alaska |
| Father's Birthplace | Canada English |
| Mother's Birthplace | California |
| Occupation | Fireman |
| Industry | Railroad |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Alaska |
| Birth Country | United States |
| Birthplace (normalized) | alaska |
1940
King-County, Washington
Head, age 40
King-County, Washington · implied b. ~1900 — 5 household members
| Surname | McKay |
| Given Name | William A. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Alaska |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Kitsap |
| Occupation | Locomotive fireman |
| Industry | Railroad |
| Class of Worker | PW |
| Hours Worked | 50 |
| Income (1939) | 1500 |
| Highest Grade | H-2 |
| 1935 Residence | Washington |
| Birth State | Alaska |
| Birth Country | United States |
| Birthplace (normalized) | alaska |
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 William Mckay across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father David Mckay (~0.92 confidence) and mother Emma Mckay (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
David Mckay
b. ~1871
Source father
● Household
· direct · ~0.92
Mother
Emma Mckay
b. ~1875
Source mother
● Household
· direct · ~0.92
This person
Anchor record
William Mckay
Head · 1940 · age 40 · b. ~1900 · Washington
★ You are viewing this record
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
40 people indexed on this census page (nara:1940:m-t0627-04343-00014)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Anna J. Barnes | 47 | wife | — | Washington |
| 2 | Robert L. Barnes | 22 | son | Sheet Metal Helper | Canada |
| 3 | Donald N. Barnes | 14 | son | — | Washington |
| 4 | William A. Mckay THIS PERSON | 40 | Head | Locomotive Fireman | Alaska |
| 5 | Marian W. Mckay | 42 | wife | — | Minnesota |
| 6 | William A. Jr. Mckay | 4 | son | — | Washington |
| 7 | Iris J. Mckay | 15 | daughter | — | Washington |
| 8 | Lois J. Mckay | 13 | daughter | — | Washington |
| 9 | Lawrence Garner | 30 | Head | Barn Hand | Nebraska |
| 10 | Mary E. Garner | 30 | wife | — | Nebraska |
| 11 | Lowell D. Garner | 4 | son | — | Nebraska |
| 12 | Gary D. Garner | 3 | son | — | Washington |
| 13 | Elmond P. Haugen | 53 | Head | Proprietor | Minnesota |
| 14 | Olive M. Haugen | 45 | wife | — | Sweden |
| 15 | Edmund H. Haugen | 23 | son | — | Montana |
| 16 | Dewey O. Haugen | 21 | son | Sheet Metal Worker | Washington |
| 17 | Kenneth L. Haugen | 19 | son | — | Washington |
| 18 | Koichi Murayama | 37 | Head | Proprietor | Japan |
| 19 | Tamiko Murayama | 32 | wife | Laborer | Japan |
| 20 | Keichi Murayama | 5 | son | — | Washington |
| 21 | Micho Murayama | 1 | son | — | Washington |
| 22 | Kaninitauzu Murayama | 69 | father | — | Japan |
| 23 | Mura Murayama | 61 | mother | — | Japan |
| 24 | Neil F. Mounts | 30 | Head | Laborer | Washington |
| 25 | Marianne Mounts | 28 | wife | — | Washington |
| 26 | William I. Mounts | 6 | son | — | Washington |
| 27 | Vernon E. Mounts | 3 | son | — | Washington |
| 28 | Gary L. Mounts | 1 | son | — | Washington |
| 29 | Esther E. Berg | 42 | Head | — | Finland |
| 30 | Alfons A. Berg | 17 | son | — | Finland |
| 31 | Elvy E. Berg | 15 | daughter | — | Washington |
| 32 | Asa R. Ellis | 52 | Head | Locomotive Engineer | Nebraska |
| 33 | Louise I. Ellis | 46 | wife | — | England |
| 34 | Raymond S. Ellis | 17 | son | — | Washington |
| 35 | Raymonda E. Ellis | 8 | daughter | — | Washington |
| 36 | George A. Rogers | 41 | Head | Proprietor | Missouri |
| 37 | Michael Endres | 70 | Head | Plasterer | Germany |
| 38 | Jennie Endres | 57 | wife | — | Virginia |
| 39 | Charles E. Armentrout | 64 | Head | Mail Messenger | Ohio |
| 40 | Eunice Armentrout | 61 | wife | — | Ohio |
Pedigree Summary
William
Gen 1 · 2 parents
~0.92
Max depth 4 (1900–1950 window)
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)