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Mary Mcdonald — 1940 US Census Record
Model Tree available1940 United States Federal Census · Whatcom-County, Washington
Our Model Tree links this Mary Mcdonald across the 1920, 1930 and 1940 US Censuses in Whatcom-County, Washington (XGBoost, ~Confirmed), with identified parents Mary — first a daughter (b.~1900), then head of a 3-person household.
Age 40
b. ~1900
Female
Daughter
Born: Washington
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Whatcom-County, Washington |
| Surname | McDonald |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 40 |
| Marital Status | Widowed |
| Birthplace | Washington |
| 1935 Residence (City) | Bellingham |
| Additional Details | |
| Occupation | Teacher |
| Industry | Public School |
| Class of Worker | GW |
| Hours Worked | 30 |
| Income (1939) | 1249 |
| Highest Grade | C 2 |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
| Occupation | Teacher |
| Township / Ward | Bellingham |
| 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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Monida Mcdonald | Daughter | — | 35 | ~1905 |
| Mary Mcdonald | Daughter | — | 40 | ~1900 |
| Mary Mcdonald | Head | — | 75 | ~1865 |
Census Appearances
1920
Whatcom, Washington
Other, age 24
Whatcom, Washington · implied b. ~1896 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDonald |
| Given Name | May |
| Relationship to Head | Lodger |
| Sex | F |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Washington |
| Father's Birthplace | Canada |
| Mother's Birthplace | Wisconsin |
| Occupation | teacher |
| Industry | public school |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
1930
Whatcom, Washington
Other, age 30
Whatcom, Washington · implied b. ~1900 — 31 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDonald |
| Given Name | Mary P. |
| Relationship to Head | Lodger |
| Sex | F |
| Color / Race | White |
| Age | 30 |
| Marital Status | Single |
| Birthplace | Washington |
| Father's Birthplace | Canada |
| Mother's Birthplace | Wisconsin |
| Occupation | Teacher |
| Industry | Public School |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
1940
Whatcom-County, Washington
Daughter, age 40
Whatcom-County, Washington · implied b. ~1900 — 3 household members
| Surname | McDonald |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 40 |
| Marital Status | Widowed |
| Birthplace | Washington |
| 1935 Residence (City) | Bellingham |
| Occupation | Teacher |
| Industry | Public School |
| Class of Worker | GW |
| Hours Worked | 30 |
| Income (1939) | 1249 |
| Highest Grade | C 2 |
| 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 Mcdonald across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Mary Mcdonald (~0.92 confidence). The pedigree spans 1 generation with 1 identified ancestor.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Mary Mcdonald
b. ~1865
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Mcdonald
Daughter · 1940 · age 40 · b. ~1900 · Washington
★ You are viewing this record
Sibling
Monida Mcdonald
Sibling · 1940 · age 35
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 — Whatcom-County, Washington
Open full size
1940 US Federal Census — Whatcom-County, Washington
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-04368-00757)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Delores Morey | 35 | wife | — | Washington |
| 2 | John Morey | 10 | son | — | Washington |
| 3 | Elizabeth Anne Morey | 6 | daughter | — | Washington |
| 4 | Albert Meyer | 55 | Head | Manager | Minnesota |
| 5 | Ethel Meyer | 53 | wife | — | Nebraska |
| 6 | Stanley Meyer | 24 | son | Laborer | Washington |
| 7 | Robert Meyer | 18 | son | — | Washington |
| 8 | Dr. E. A. Morey | 73 | Head | — | Illinois |
| 9 | William Neen | 61 | Head | Coal Miner | England |
| 10 | Margaret Neen | 55 | wife | — | England |
| 11 | Harold Dahl | 20 | Head | — | Washington |
| 12 | Eliot Gilmore | 38 | Head | Newspaper Editor | Wisconsin |
| 13 | Alice Gilmore | 36 | wife | — | Wisconsin |
| 14 | Emily Gilmore | 10 | daughter | — | Wisconsin |
| 15 | Betty Gilmore | 14 | daughter | — | Wisconsin |
| 16 | Grace Gilmore | 13 | daughter | — | Wisconsin |
| 17 | Roberta Gilmore | 9 | daughter | — | Washington |
| 18 | Mary M. Mcdonald | 75 | Head | — | Wisconsin |
| 19 | Mary Mcdonald THIS PERSON | 40 | daughter | Teacher | Washington |
| 20 | Monida Mcdonald | 35 | daughter | Teacher | Washington |
| 21 | Elda Haugen | 57 | Head | — | Norway |
| 22 | Edith Jacobson | 23 | Lodger | Ironer | Washington |
| 23 | Almira Willison | 63 | Head | School Teacher | Wisconsin |
| 24 | Eleanor Willison | 23 | daughter | — | Montana |
| 25 | Grover Clark | 55 | Head | Laborer | New Hampshire |
| 26 | Lucile Clark | 46 | wife | — | Tennessee |
| 27 | Elaine Clark | 18 | daughter | — | New Hampshire |
| 28 | Elizabeth Sanden | 75 | Head | — | Sweden |
| 29 | Arthur Sanden | 47 | son | Art Instructor | Colorado |
| 30 | Letha Toms | 17 | servant | Servant | Wyoming |
| 31 | Claude Puchty | 42 | Head | Sawyer | Kansas |
| 32 | Isabelle Puchty | 55 | wife | — | England |
| 33 | Jay Smith | 37 | Head | Light Co Service Man | Washington |
| 34 | Anne Smith | 34 | wife | — | Oregon |
| 35 | Wayne Smith | 11 | son | — | Washington |
| 36 | Wesley Smith | 9 | son | — | Washington |
| 37 | Louie Kaufman | 72 | Head | — | Indiana |
| 38 | Vernie Davis | 33 | daughter | Housework | Washington |
| 39 | Donald Davis | 10 | grandson | — | Washington |
Pedigree Summary
Mary + 1 sibling
Gen 1 · 1 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)