KJ
Katherine Johnson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Henry-County, Illinois
Our Model Tree links this Katherine Johnson across the 1920, 1930 and 1940 US Censuses in Henry-County, Illinois (XGBoost, ~Confirmed) — first a spouse (b.~1893), then head of a 4-person household.
Age 47
b. ~1893
Female
Spouse
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Henry-County, Illinois |
| Surname | Johnson |
| Given Name | Katherine |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 47 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Wethersfield |
| 1935 Residence (County) | Henry |
| Additional Details | |
| Highest Grade | C 2 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Wethersfield |
| Est. Birth Year | ~1893 |
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 Katherine | Age | Birth yr |
|---|---|---|---|---|
| Josephine Johnson | Daughter | — | 18 | ~1922 |
| Margaret Johnson | Daughter | — | 19 | ~1921 |
| David Johnson | Head | — | 59 | ~1881 |
| Katherine Johnson | Spouse | — | 47 | ~1893 |
Census Appearances
1920
Henry, Illinois
Spouse, age 27
Henry, Illinois · implied b. ~1893 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Katherine |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 27 |
| Marital Status | Married |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Henry, Illinois
Spouse, age 37
Henry, Illinois · implied b. ~1893 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Katherine M. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 37 |
| Marital Status | Married |
| Birthplace | Illinois |
| Age at First Marriage | 26 |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Henry-County, Illinois
Spouse, age 47
Henry-County, Illinois · implied b. ~1893 — 4 household members
| Surname | Johnson |
| Given Name | Katherine |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 47 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Wethersfield |
| 1935 Residence (County) | Henry |
| Highest Grade | C 2 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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 Katherine Johnson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Katherine Johnson
Spouse · 1940 · age 47 · b. ~1893 · Illinois
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Henry-County, Illinois
Open full size
1940 US Federal Census — Henry-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00812-00731)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Helen Lundquist | 13 | Daughter | — | Illinois |
| 2 | John Munson | 57 | Head | Farmer | Sweden |
| 3 | Sigrid Munson | 50 | Wife | — | Sweden |
| 4 | Hana Swanson | 57 | H. man | Laborer | Sweden |
| 5 | Samuel Kinwig | 51 | Head | Farmer | Isle of Man |
| 6 | Ethel Kinwig | 45 | Wife | — | Illinois |
| 7 | Cora Kinwig | 13 | Daughter | — | Illinois |
| 8 | Theodore Anderson | 59 | Head | Farmer | Sweden |
| 9 | Emily Anderson | 55 | Wife | — | Illinois |
| 10 | Bernice Anderson | 27 | Daughter | — | Illinois |
| 11 | Ralph Anderson | 22 | Son | Laborer | Illinois |
| 12 | Raymond Anderson | 16 | Son | — | Illinois |
| 13 | Otto Dallmann | 58 | Head | Farmer | Illinois |
| 14 | Annie Dallmann | 60 | Wife | — | Illinois |
| 15 | Arven Fisher | 28 | H. man | Laborer | Illinois |
| 16 | Henry Erickson | 51 | Head | Farmer | Sweden |
| 17 | Elsie Erickson | 50 | Wife | — | Sweden |
| 18 | Howard Peterson | 42 | Head | — | Illinois |
| 19 | Willis Peterson | 13 | Son | — | Illinois |
| 20 | George Gilman | 77 | Lodger | — | New Hamp. |
| 21 | Sarah Gilman | 82 | Lodger | — | Ohio |
| 22 | Aaron Andree | 55 | Head | Farmer | Illinois |
| 23 | Edith Andree | 50 | Wife | — | Illinois |
| 24 | Elaine Andree | 10 | Daughter | — | Illinois |
| 25 | Eleanor M. Andree | 4 | Daughter | — | Illinois |
| 26 | Herman Krueger | 57 | H. man | Laborer | Illinois |
| 27 | Axel Gustafson | 53 | Head | Farmer | Illinois |
| 28 | Bertha Gustafson | 39 | Wife | — | Illinois |
| 29 | Phyllis Gustafson | 6 | Daughter | — | Illinois |
| 30 | Cooper Garland | 17 | H. man | Laborer | Illinois |
| 31 | David Johnson | 59 | Head | Farmer | Illinois |
| 32 | Katherine Johnson THIS PERSON | 47 | Wife | — | Illinois |
| 33 | Margaret Johnson | 19 | Daughter | — | Illinois |
| 34 | Josephine Johnson | 18 | Daughter | — | Illinois |
| 35 | August Conner | 42 | Head | Laborer | Illinois |
| 36 | Mabel Conner | 43 | Wife | — | Illinois |
| 37 | Lloyd Conner | 20 | Son | Laborer | Illinois |
| 38 | Marian Conner | 18 | Daughter | — | Nebraska |
| 39 | Merle Conner | 17 | Son | — | Nebraska |
| 40 | Theodore Conner | 14 | Son | — | Nebraska |
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)