MJ
Mary Johnston — 1940 US Census Record
Model Tree available1940 United States Federal Census · Tippecanoe-County, Indiana
Our Model Tree links this Mary Johnston across the 1920, 1930 and 1940 US Censuses in Tippecanoe-County, Indiana (XGBoost, ~Confirmed), with identified parents Flora & Thomas — first a daughter (b.~1920), then head of a 4-person household.
Age 20
b. ~1920
Female
Daughter
Born: Indiana
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Tippecanoe-County, Indiana |
| Surname | Johnston |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | West Lafayette City |
| 1935 Residence (County) | Tippecanoe |
| Additional Details | |
| Highest Grade | C 2 |
| 1935 Residence | Same place |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
| Township / Ward | West Lafayette City |
| Est. Birth Year | ~1920 |
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 |
|---|---|---|---|---|
| Mary Johnston | Daughter | — | 20 | ~1920 |
| J Johnston | Head | — | 45 | ~1895 |
| David Johnston | Son | — | 12 | ~1928 |
| Flora Johnston | Spouse | — | 49 | ~1891 |
Census Appearances
1920
Tippecanoe, Indiana
Daughter, age
Tippecanoe, Indiana · implied b. ~1920 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnston |
| Given Name | Mary F |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Occupation | none |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1930
Tippecanoe, Indiana
Daughter, age 10
Tippecanoe, Indiana · implied b. ~1920 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnston |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Can Read/Write | Yes |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1940
Tippecanoe-County, Indiana
Daughter, age 20
Tippecanoe-County, Indiana · implied b. ~1920 — 4 household members
| Surname | Johnston |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | West Lafayette City |
| 1935 Residence (County) | Tippecanoe |
| Highest Grade | C 2 |
| 1935 Residence | Same place |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
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. Identified parents: mother Flora Johnston (~0.92 confidence) and father Thomas Johnston (~0.92 confidence) and father J Johnston (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Flora Johnston
b. ~1891
Source mother
● Household
· direct · ~0.92
Father
Thomas Johnston
b. ~1893
Source father
● Household
· direct · ~0.92
Father
J Johnston
b. ~1895
Source father
● Household
· direct · ~0.92
This person
Anchor record
Mary Johnston
Daughter · 1940 · age 20 · b. ~1920 · Indiana
★ You are viewing this record
Sibling
David Johnston
Sibling · 1940 · age 12
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 — Tippecanoe-County, Indiana
Open full size
1940 US Federal Census — Tippecanoe-County, Indiana
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01099-00490)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | B. G. Korschot | 50 | Head | Gen Contractor | New York |
| 2 | Myrtle Korschot | 49 | Wife | — | Indiana |
| 3 | Calvin Korschot | 19 | Son | — | Indiana |
| 4 | Lawrence Aretz | 45 | Head | Manager | Minnesota |
| 5 | Florence Aretz | 40 | Wife | — | Illinois |
| 6 | Richard Aretz | 16 | Son | — | Indiana |
| 7 | Rosemary Aretz | 14 | Daughter | — | Indiana |
| 8 | Mary Carolyn Aretz | 12 | Daughter | — | Indiana |
| 9 | Donald Thomas Aretz | 10 | Son | — | Indiana |
| 10 | Carl Swenson | 33 | Head | Automobile Mechanic | Indiana |
| 11 | Opal Swenson | 33 | Wife | Proprietor | Indiana |
| 12 | Donald Lee Swenson | 5 | Son | — | Indiana |
| 13 | Carolyn Sue Swenson | 3 | Daughter | — | Indiana |
| 14 | Mary Boes | 77 | Head | — | Indiana |
| 15 | Catherine Boes | 37 | Daughter | Asst Cashier | Indiana |
| 16 | Florence Boes | 34 | Daughter | — | Indiana |
| 17 | Wm Louis Schmidt | 23 | Lodger | Maintenance Engineer | Iowa |
| 18 | John Allen | 58 | Head | Photo Artist | Illinois |
| 19 | Abbie Allen | 58 | Wife | — | Indiana |
| 20 | J. R. Johnston | 45 | Head | Director Publicity | Indiana |
| 21 | Flora Johnston | 49 | Wife | — | Indiana |
| 22 | Mary Johnston THIS PERSON | 20 | Daughter | — | Indiana |
| 23 | David Johnston | 12 | Son | — | Indiana |
| 24 | Thomas Speaker | 38 | Head | Salesman | Iowa |
| 25 | Alida Speaker | 28 | Wife | — | Indiana |
| 26 | Bette Ann Speaker | 2 | Daughter | — | Indiana |
| 27 | Thomas Jr. Speaker | 0 | Son | — | Indiana |
| 28 | Edward Hurley | 55 | Head | Prop & Mgr | Indiana |
| 29 | Mari Hurley | 52 | Wife | — | Indiana |
| 30 | Edward Jr. Hurley | 25 | Son | Accountant | Indiana |
| 31 | John R. Hurley | 20 | Son | Advertising | Indiana |
| 32 | Stephen C. Hurley | 18 | Son | — | Indiana |
| 33 | Eileen M. Hurley | 13 | Daughter | — | Indiana |
| 34 | George Boes | 43 | Head | Contractor | Indiana |
| 35 | Mayme Boes | 40 | Wife | — | Indiana |
| 36 | Jane Boes | 17 | Daughter | — | Indiana |
| 37 | Jack Boes | 15 | Son | — | Indiana |
| 38 | A. E. Burkhart | 58 | Head | Station Master | Indiana |
| 39 | Minnie Burkhart | 56 | Wife | — | Indiana |
| 40 | Evalyn Burkhart | 35 | Daughter | Dental Asst | Indiana |
Pedigree Summary
Mary + 1 sibling
Gen 1 · 3 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)