MJ
Mary Johnston — 1940 US Census Record
Model Tree available1940 United States Federal Census · Webster-County, Iowa
Our Model Tree links this Mary Johnston across the 1920, 1930 and 1940 US Censuses in Webster-County, Iowa (XGBoost, ~Confirmed), with identified parents Herman & Vernon — first a daughter (b.~1920), then head of a 7-person household.
Age 20
b. ~1920
Female
Daughter
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Webster-County, Iowa |
| Surname | Johnston |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Kalo Junction |
| 1935 Residence (County) | Webster |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | H 4 |
| 1935 Residence | Same House |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Kalo Junction |
| 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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Dorothy Johnston | Daughter | — | 19 | ~1921 |
| Janet Johnston | Daughter | — | 3 | ~1937 |
| Mary Johnston | Daughter | — | 20 | ~1920 |
| Vernon Johnston | Head | — | 49 | ~1891 |
| Gordon Johnston | Son | — | 16 | ~1924 |
| Larry Johnston | Son | — | 13 | ~1927 |
| Kathryn Johnston | Spouse | — | 42 | ~1898 |
Census Appearances
1920
Webster, Iowa
Daughter, age
Webster, Iowa · implied b. ~1920 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnston |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Webster, Iowa
Daughter, age 10
Webster, Iowa · implied b. ~1920 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnston |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Webster-County, Iowa
Daughter, age 20
Webster-County, Iowa · implied b. ~1920 — 7 household members
| Surname | Johnston |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Kalo Junction |
| 1935 Residence (County) | Webster |
| Income (1939) | 0 |
| Highest Grade | H 4 |
| 1935 Residence | Same House |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
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: father Herman Johnston (~0.92 confidence) and father Vernon Johnston (~0.92 confidence) and mother Beatrice Johnston (~0.92 confidence) and mother Kathryn Johnston (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Herman Johnston
b. ~1890
Source father
● Household
· direct · ~0.92
Father
Vernon Johnston
b. ~1890
Source father
● Household
· direct · ~0.92
Mother
Beatrice Johnston
b. ~1897
Source mother
● Household
· direct · ~0.92
Mother
Kathryn Johnston
b. ~1898
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Johnston
Daughter · 1940 · age 20 · b. ~1920 · Iowa
★ You are viewing this record
Sibling
Larry Johnston
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dorothy Johnston
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Janet Johnston
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Gordon Johnston
Sibling · 1940 · age 16
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 — Webster-County, Iowa
Open full size
1940 US Federal Census — Webster-County, Iowa
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-01212-00449)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Nancy D. Brody | 70 | Head | Housekeeper | Iowa |
| 42 | Raymond Brody | 27 | Son | Trucker | Iowa |
| 43 | Elsie Brody | 30 | Daughter | — | Iowa |
| 44 | Donald Johnston | 33 | Head | Factory Machine | Iowa |
| 45 | Lorene Johnston | 33 | Wife | — | Iowa |
| 46 | Donald Johnston | 16 | Son | — | Iowa |
| 47 | Patty Johnston | 13 | Daughter | — | Iowa |
| 48 | Gretchen Johnston | 12 | Daughter | — | Iowa |
| 49 | Billy Johnston | 10 | Daughter | — | Iowa |
| 50 | La Donna Johnston | 9 | Daughter | — | Iowa |
| 51 | Allen Johnston | 7 | Son | — | Iowa |
| 52 | Martha Johnston | 6 | Daughter | — | Iowa |
| 53 | Richard Johnston | 4 | Son | — | Iowa |
| 54 | Kent Johnston | 2 | Son | — | Iowa |
| 55 | Vernon Johnston | 49 | Head | Foreman Sand Plant | Iowa |
| 56 | Kathryn Johnston | 42 | Wife | Janitress | Iowa |
| 57 | Mary Johnston THIS PERSON | 20 | Daughter | — | Iowa |
| 58 | Dorothy Johnston | 19 | Daughter | New Worker | Iowa |
| 59 | Gordon Johnston | 16 | Son | — | Iowa |
| 60 | Larry Johnston | 13 | Son | — | Iowa |
| 61 | Janet Johnston | 3 | Daughter | — | Iowa |
| 62 | Ernst Freund | 45 | Head | Mechanic Mine Machinery | Iowa |
| 63 | Mildred Freund | 30 | Wife | — | Iowa |
| 64 | Merle Freund | 22 | Son | Trucking | Iowa |
| 65 | Margaret Freund | 17 | Daughter | Maid | Iowa |
| 66 | Madge Freund | 15 | Daughter | — | Iowa |
| 67 | Melvin Freund | 12 | Son | — | Iowa |
| 68 | Dorothy Freund | 22 | Daughter | Cook | Iowa |
| 69 | Kenneth Freund | 45 | Head | Machinist Excavating Plant | Iowa |
| 70 | Mildred Freund | 33 | Wife | — | Iowa |
| 71 | Kenneth Freund | 12 | Son | — | Iowa |
| 72 | Marcus Freund | 6 | Son | — | Iowa |
| 73 | Merritt Freund | 3 | Son | — | Iowa |
| 74 | Lorna Freund | 38 | Head | Farming | Iowa |
| 75 | Lloyd Stewart | 39 | Head | Stationary Engineer | Iowa |
| 76 | Gladys Stewart | 38 | Wife | — | Iowa |
| 77 | Ronald Stewart | 10 | Son | — | Iowa |
| 78 | David Stewart | 2 | Son | — | Iowa |
| 79 | William Stewart | 78 | Father | Fireman | Ireland |
Pedigree Summary
Mary + 4 siblings
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)