KJ
Katherine Johnson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Katherine Johnson across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Oliver & Katherine — first a daughter (b.~1917), then head of a 3-person household.
Age 23
b. ~1917
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Johnson |
| Given Name | Katherine |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Artist |
| Industry | Commercial |
| Class of Worker | OA |
| Hours Worked | 36 |
| Income (1939) | 800 |
| Highest Grade | C 4 |
| 1935 Residence | Same Place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Artist |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1917 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Katherine | Age | Birth yr |
|---|---|---|---|---|
| Katherine Johnson | Daughter | — | 23 | ~1917 |
| Katherine Johnson | Spouse | — | 52 | ~1888 |
| Oliver Johnson | Head | — | 59 | ~1881 |
Census Appearances
1920
Cook, Illinois
Daughter, age 2
Cook, Illinois · implied b. ~1918 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Kathleen L. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Ireland |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Daughter, age 13
Cook, Illinois · implied b. ~1917 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Katherine |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Ireland |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 23
Cook-County, Illinois · implied b. ~1917 — 3 household members
| Surname | Johnson |
| Given Name | Katherine |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | Artist |
| Industry | Commercial |
| Class of Worker | OA |
| Hours Worked | 36 |
| Income (1939) | 800 |
| Highest Grade | C 4 |
| 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. Identified parents: father Oliver Johnson (~0.92 confidence) and mother Katherine Johnson (~0.92 confidence) and father Arvid Johnson (~0.92 confidence) and father Arvid Johnson (~0.92 confidence) and mother Katherine Johnson (~0.92 confidence) and mother Kathleen Johnson (~0.92 confidence). The pedigree spans 1 generation with 6 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Oliver Johnson
b. ~1881
Source father
● Household
· direct · ~0.92
Mother
Katherine Johnson
b. ~1883
Source mother
● Household
· direct · ~0.92
Father
Arvid Johnson
b. ~1884
Source father
● Household
· direct · ~0.92
Father
Arvid Johnson
b. ~1885
Source father
● Household
· direct · ~0.92
Mother
Katherine Johnson
b. ~1888
Source mother
● Household
· direct · ~0.92
Mother
Kathleen Johnson
b. ~1889
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Katherine Johnson
Daughter · 1940 · age 23 · b. ~1917 · 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 — Cook-County, Illinois
Open full size
1940 US Federal Census — Cook-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00928-00534)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Marian Riley | 44 | Wife | — | Minnesota |
| 2 | Walter Riley | 17 | Son | — | Illinois |
| 3 | Paul Riley | 15 | Son | — | Illinois |
| 4 | Richard Riley | 13 | Son | — | Illinois |
| 5 | Duncan Riley | 9 | Son | — | Illinois |
| 6 | Alberta Llewellyn | 74 | Mother | — | England |
| 7 | Walter H. Lowry | 34 | Head | Advertising Manager | Louisiana |
| 8 | Virginia Lowry | 32 | Wife | — | Missouri |
| 9 | Roberta Phil Lowry | 1 | Daughter | — | Illinois |
| 10 | Ann J. Biege | 21 | Nurse | Nurse - New Maid | Wisconsin |
| 11 | Leo W. Hoffman | 53 | Head | Lawyer | Illinois |
| 12 | Addie H. Bonem | 71 | Aunt | — | Illinois |
| 13 | Rosalie Golding | 47 | Cousin | — | Indiana |
| 14 | Elroy D. Golding | 21 | Cousin | — | Illinois |
| 15 | James J. Carroll | 67 | Head | Broker | England |
| 16 | Nicolas R. Carroll | 70 | Brother | — | England |
| 17 | Daniel Carroll | 59 | Brother | Proprietor | Canada |
| 18 | Lillian Carroll | 46 | Sister-in-Law | — | Illinois |
| 19 | Daniel Jr. Carroll | 6 | Nephew | — | Illinois |
| 20 | Edwin Goldsmith | 54 | Head | Executive | Illinois |
| 21 | Birdie Goldsmith | 47 | Wife | — | Illinois |
| 22 | Florence Colby | 18 | Daughter | — | Illinois |
| 23 | Lois Colby | 16 | Daughter | — | Illinois |
| 24 | Mark C. Goodman | 45 | Head | Manager | Illinois |
| 25 | Ruth Goodman | 46 | Wife | — | Illinois |
| 26 | Mark Jr. Goodman | 15 | Son | — | Illinois |
| 27 | Mildred Juracek | 20 | Maid | Maid | Illinois |
| 28 | Oliver B. Johnson | 59 | Head | Proprietor | Michigan |
| 29 | Katherine Johnson | 52 | Wife | Manager | Michigan |
| 30 | Katherine Johnson THIS PERSON | 23 | Daughter | Artist | Illinois |
| 31 | Mary E. Kerby | 60 | Head | — | Canada |
| 32 | O. M. Carter | 70 | Lodger | Lawyer | Illinois |
| 33 | Alec Kramer | 43 | Head | Salesman | Michigan |
| 34 | Ellen Kramer | 40 | Wife | — | Indiana |
| 35 | Palma Bargia | 34 | Head | Waitress | Illinois |
| 36 | Rose Bargia | 16 | Daughter | — | Illinois |
| 37 | Helen Bargia | 14 | Daughter | — | Illinois |
| 38 | Peter Bargia | 13 | Son | — | Illinois |
| 39 | Raymond Bargia | 11 | Son | — | Illinois |
| 40 | Helen Moler | 26 | Lodger | Waitress | Pennsylvania |
Pedigree Summary
Katherine
Gen 1 · 6 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)