MC
Mary Campbell — 1940 US Census Record
Linked across censuses1940 United States Federal Census · King-County, Washington
Our Model Tree links this Mary Campbell across the 1920, 1930 and 1940 US Censuses in King-County, Washington (XGBoost, ~Confirmed) — first a spouse (b.~1872), then head of a 4-person household.
Age 68
b. ~1872
Female
Spouse
Born: Wisconsin
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | King-County, Washington |
| Surname | Campbell |
| Given Name | Mary C. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 68 |
| Marital Status | Married |
| Birthplace | Wisconsin |
| 1935 Residence (City) | Mount View Precinct |
| 1935 Residence (County) | King |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
| Township / Ward | Mount View Precinct |
| Est. Birth Year | ~1872 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Perry Campbell | Head | — | 73 | ~1867 |
| Gail Campbell | Son | — | 29 | ~1911 |
| Cled Campbell | Son | — | 27 | ~1913 |
| Mary Campbell | Spouse | — | 68 | ~1872 |
Census Appearances
1920
King, Washington
Spouse, age 48
King, Washington · implied b. ~1872 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Campbell |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 48 |
| Marital Status | Married |
| Birthplace | Wisconsin |
| Father's Birthplace | New York |
| Mother's Birthplace | Ireland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
1930
King, Washington
Other, age 58
King, Washington · implied b. ~1872 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Campbell |
| Given Name | Mary E. |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 58 |
| Marital Status | Married |
| Birthplace | Wisconsin |
| Father's Birthplace | New York |
| Mother's Birthplace | Irish Free State |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
1940
King-County, Washington
Spouse, age 68
King-County, Washington · implied b. ~1872 — 4 household members
| Surname | Campbell |
| Given Name | Mary C. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 68 |
| Marital Status | Married |
| Birthplace | Wisconsin |
| 1935 Residence (City) | Mount View Precinct |
| 1935 Residence (County) | King |
| Income (1939) | 0 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
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 Campbell across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Campbell
Spouse · 1940 · age 68 · b. ~1872 · Washington
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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-t0627-04345-00596)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | J. C. Al. Publicover | 66 | Head | Cook | Nova Scotia |
| 42 | William Conaty | 31 | Nephew | Machinist Helper | Washington |
| 43 | Marie Conaty | 28 | Niece | — | Washington |
| 44 | William Babcock | 68 | Head | — | Missouri |
| 45 | Elmira P. Babcock | 56 | Wife | Cook | Utah |
| 46 | John J. Carey | 57 | Head | Janitor | Massachusetts |
| 47 | Clinton Stewart | 38 | Head | Brickmason | Colorado |
| 48 | Mildred Stewart | 38 | Wife | — | Illinois |
| 49 | Dorothy Stewart | 12 | Daughter | — | Illinois |
| 50 | Patsy Stewart | 8 | Daughter | — | Illinois |
| 51 | Joan Stewart | 3 | Daughter | — | Washington |
| 52 | Milton Stewart | 2 | Son | — | Washington |
| 53 | Archal Snider | 45 | Head | Truck Driver | Michigan |
| 54 | Anne Snider | 40 | Wife | — | Pennsylvania |
| 55 | Barbara Snider | 19 | Daughter | Ledger Staffer | Washington |
| 56 | Frances Snider | 10 | Daughter | — | Washington |
| 57 | Bridget Waugh | 81 | Head | — | New York |
| 58 | John M. Waugh | 38 | Head | Truck Driver | Massachusetts |
| 59 | Audrey Waugh | 34 | Wife | — | Washington |
| 60 | Katherine Waugh | 6 | Daughter | — | Washington |
| 61 | Jack Waugh | 5 | Son | — | Washington |
| 62 | Rita Marie Waugh | 0 | Daughter | — | Washington |
| 63 | Perry C. Campbell | 73 | Head | — | Wisconsin |
| 64 | Mary C. Campbell THIS PERSON | 68 | Wife | — | Wisconsin |
| 65 | Gail Campbell | 29 | Son | Laborer | Washington |
| 66 | Cled Campbell | 27 | Son | Helper | Washington |
| 67 | Carl H. Van Zile | 36 | Head | Tool Checker | Washington |
| 68 | Frances Van Zile | 31 | Wife | — | Montana |
| 69 | Marie Van Zile | 13 | Daughter | — | Washington |
| 70 | Dorothy Van Zile | 12 | Daughter | — | Washington |
| 71 | Margaret Van Zile | 11 | Daughter | — | Washington |
| 72 | Esther Van Zile | 3 | Daughter | — | Washington |
| 73 | George D. Knudson | 31 | Head | Manager | Wisconsin |
| 74 | Vera B. Knudson | 31 | Wife | Hosiery Mender | Norway |
| 75 | Norma Jean Knudson | 4 | Daughter | — | Washington |
| 76 | Sandra Mae Knudson | 2 | Daughter | — | Washington |
| 77 | Roy Alloway | 65 | Head | Contractor | Iowa |
| 78 | Eliza J. Alloway | 69 | Wife | — | Iowa |
| 79 | L. V. Bilyeu | 66 | Head | Nightwatchman | Illinois |
| 80 | Grant Freaker | 74 | Head | — | Kansas |
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)