WM
William Mcdonald — 1940 US Census Record
Model Tree available1940 United States Federal Census · King-County, Washington
Our Model Tree links this William Mcdonald across the 1920, 1930 and 1940 US Censuses in King-County, Washington (XGBoost, ~Confirmed), with identified parents Isabelle & James — first a son (b.~1915), then head of a 3-person household.
Age 25
b. ~1915
Male
Son
Born: Washington
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | King-County, Washington |
| Surname | McDonald |
| Given Name | William A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Washington |
| 1935 Residence (City) | Seattle City |
| 1935 Residence (County) | King |
| Additional Details | |
| Occupation | Brakeman |
| Industry | Steam Railroad |
| Class of Worker | PW |
| Hours Worked | 23 |
| Income (1939) | 0 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
| Occupation | Brakeman |
| Township / Ward | Seattle City |
| Est. Birth Year | ~1915 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| James Mcdonald | Head | — | 52 | ~1888 |
| William Mcdonald | Son | — | 25 | ~1915 |
| Isabella Mcdonald | Spouse | — | 52 | ~1888 |
Census Appearances
1920
King, Washington
Son, age 4
King, Washington · implied b. ~1916 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDonald |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Washington |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
1930
King, Washington
Son, age 15
King, Washington · implied b. ~1915 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDonald |
| Given Name | William A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Washington |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Can Read/Write | Yes |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
1940
King-County, Washington
Son, age 25
King-County, Washington · implied b. ~1915 — 3 household members
| Surname | McDonald |
| Given Name | William A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Washington |
| 1935 Residence (City) | Seattle City |
| 1935 Residence (County) | King |
| Occupation | Brakeman |
| Industry | Steam Railroad |
| Class of Worker | PW |
| Hours Worked | 23 |
| Income (1939) | 0 |
| 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 William Mcdonald across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Isabelle Mcdonald (~0.92 confidence) and father James Mcdonald (~0.92 confidence) and father James Mcdonald (~0.92 confidence) and mother Isabella Mcdonald (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Isabelle Mcdonald
b. ~1881
Source mother
● Household
· direct · ~0.92
Father
James Mcdonald
b. ~1884
Source father
● Household
· direct · ~0.92
Father
James Mcdonald
b. ~1888
Source father
● Household
· direct · ~0.92
Mother
Isabella Mcdonald
b. ~1888
Source mother
● Household
· direct · ~0.92
This person
Anchor record
William Mcdonald
Son · 1940 · age 25 · b. ~1915 · 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-t0627-04381-00508)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Andrew J. Esscher | 43 | Son | Laborer | Michigan |
| 42 | James J. Esscher | 20 | Son | New Worker | Washington |
| 43 | Alance P. Wheat | 45 | Head | Saleslady | Canada-French |
| 44 | Benjamin P. Wheat | 18 | Son | — | Minnesota |
| 45 | John F. Aganhall | 28 | Head | Salesman | Texas |
| 46 | Virginia L. Aganhall | 25 | Wife | Mach. Operator | Ohio |
| 47 | William H. Barry | 54 | Head | Postal Clerk | Montana |
| 48 | Anita J. Barry | 52 | Wife | — | Louisiana |
| 49 | Theodosia M. Barry | 30 | Daughter | Service Dept. | Montana |
| 50 | John E. Jr. Newcomb | 52 | Head | Mechanic | New Jersey |
| 51 | Gladys Newcomb | 48 | Wife | — | Washington |
| 52 | Colin Newcomb | 14 | Son | — | Washington |
| 53 | Hiram M. Lawrence | 64 | Head | General Manager | Illinois |
| 54 | Jessie T. Lawrence | 60 | Wife | — | Illinois |
| 55 | Frederick P. Wilson | 69 | Head | Carpenter | California |
| 56 | Margaret J. Wilson | 60 | Wife | — | Pennsylvania |
| 57 | Blodwyn Davis | 45 | Head | — | Canada-Eng |
| 58 | James W. Webb | 56 | Lodger | Salesman | Pennsylvania |
| 59 | John W. Howey | 52 | Head | Surveyor | S. Dakota |
| 60 | Hazel O. Howey | 48 | Wife | — | Nebraska |
| 61 | Soren M. Rahl | 26 | Head | Carpenter Helper | Washington |
| 62 | Violet A. Rahl | 21 | Wife | — | Canada-Eng |
| 63 | (House Ends Block 122 & Begins Block 123) | None | — | — | — |
| 64 | Percy Rochfort | 57 | Head | Night Tender | England |
| 65 | Ann Rochfort | 59 | Wife | — | England |
| 66 | Rose M. Rochfort | 28 | Daughter | Sewing Machine Operator | Washington |
| 67 | James Mcdonald | 52 | Head | Janitor | Scotland |
| 68 | Isabella Mcdonald | 52 | Wife | — | Scotland |
| 69 | William A. Mcdonald THIS PERSON | 25 | Son | Brakeman | Washington |
| 70 | Eleanor L. Hecker | 59 | Head | — | Iowa |
| 71 | William W. Hecker | 28 | Son | Floor Walker | Washington |
| 72 | Jesse B. Nelson | 46 | Head | Steam Fitter | Iowa |
| 73 | Marion G. Nelson | 36 | Wife | Pharmacist | Canada-Eng |
| 74 | Raymond B. Nelson | 7 | Son | — | Washington |
| 75 | Lois Mary M. Prime | 63 | Lodger | — | Pennsylvania |
| 76 | Archie H. Johnson | 30 | Head | Baker | Idaho |
| 77 | Eva L. Johnson | 29 | Wife | — | Utah |
| 78 | Arlene Johnson | 7 | Daughter | — | Washington |
| 79 | Walter Johnson | 3 | Son | — | Washington |
| 80 | James C. Hope | 87 | Head | — | Pennsylvania |
Pedigree Summary
William
Gen 1 · 4 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)