MJ
Mary Johnston — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Douglas-County, Oregon
Our Model Tree links this Mary Johnston across the 1920, 1930 and 1940 US Censuses in Douglas-County, Oregon (XGBoost, ~Confirmed) — first a spouse (b.~1885), then head of a 4-person household.
Age 55
b. ~1885
Female
Spouse
Born: Oregon
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Douglas-County, Oregon |
| Surname | Johnston |
| Given Name | Mary S. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 55 |
| Marital Status | Married |
| Birthplace | Oregon |
| 1935 Residence (City) | Riddle Precinct |
| 1935 Residence (County) | Douglas |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Oregon |
| Birth Country | United States |
| Birthplace (normalized) | oregon |
| Township / Ward | Riddle Precinct |
| Est. Birth Year | ~1885 |
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 |
|---|---|---|---|---|
| Ralph Johnston | Head | — | 71 | ~1869 |
| Clarence Johnston | Son | — | 27 | ~1913 |
| Ralph Johnston | Son | — | 29 | ~1911 |
| Mary Johnston | Spouse | — | 55 | ~1885 |
Census Appearances
1920
Douglas, Oregon
Spouse, age 35
Douglas, Oregon · implied b. ~1885 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnston |
| Given Name | Mary S. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 35 |
| Marital Status | Married |
| Birthplace | Oregon |
| Father's Birthplace | France |
| Mother's Birthplace | France |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Oregon |
| Birth Country | United States |
| Birthplace (normalized) | oregon |
1930
Douglas, Oregon
Other, age 43
Douglas, Oregon · implied b. ~1887 — 46 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnston |
| Given Name | Mary E. |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 43 |
| Marital Status | Married |
| Birthplace | Oregon |
| Age at First Marriage | 18 |
| Father's Birthplace | France |
| Mother's Birthplace | France |
| Can Read/Write | Yes |
| Birth State | Oregon |
| Birth Country | United States |
| Birthplace (normalized) | oregon |
1940
Douglas-County, Oregon
Spouse, age 55
Douglas-County, Oregon · implied b. ~1885 — 4 household members
| Surname | Johnston |
| Given Name | Mary S. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 55 |
| Marital Status | Married |
| Birthplace | Oregon |
| 1935 Residence (City) | Riddle Precinct |
| 1935 Residence (County) | Douglas |
| Class of Worker | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Oregon |
| Birth Country | United States |
| Birthplace (normalized) | oregon |
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 Johnston across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Johnston
Spouse · 1940 · age 55 · b. ~1885 · Oregon
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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 — Douglas-County, Oregon
Open full size
1940 US Federal Census — Douglas-County, Oregon
Page Contents
15 people indexed on this census page (nara:1940:m-t0627-03360-00709)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Albert R. Ball | 48 | Head | Farmer | Oregon |
| 42 | Lillian C. Ball | 46 | Wife | — | Oregon |
| 43 | Roscoe E. Ball | 20 | Son | Laborer | Oregon |
| 44 | Betty Ball | 13 | Daughter | — | Oregon |
| 45 | Mary S. Mayne | 77 | Mother-in-law | — | Kentucky |
| 46 | Ralph E. Johnston | 71 | Head | Farmer | Oregon |
| 47 | Mary S. Johnston THIS PERSON | 55 | Wife | — | Oregon |
| 48 | Ralph E. Johnston | 29 | Son | Farmer | Oregon |
| 49 | Clarence W. Johnston | 27 | Son | Farmer | Oregon |
| 50 | John E. Carter | 63 | Head | Farmer | Ohio |
| 51 | Mamie E. Carter | 59 | Wife | — | Illinois |
| 52 | James L. Carter | 26 | Son | Farmer | Iowa |
| 53 | William H. Phillips | 21 | Head | Laborer | California |
| 54 | Hazel G. Phillips | 20 | Wife | — | Oregon |
| 55 | Craig F. Phillips | 1 | Son | — | Oregon |
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)