KJ
Katherine Johnson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Delta-County, Michigan
Our Model Tree links this Katherine Johnson across the 1920, 1930 and 1940 US Censuses in Delta-County, Michigan (XGBoost, ~Confirmed) — first a spouse (b.~1875), then head of a 4-person household.
Age 65
b. ~1875
Female
Spouse
Born: Finland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Delta-County, Michigan |
| Surname | Johnson |
| Given Name | Katherine |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 65 |
| Marital Status | Married |
| Birthplace | Finland |
| 1935 Residence (City) | Gladstone city |
| 1935 Residence (County) | Delta |
| Naturalization Status | Naturalized |
| Additional Details | |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth Country | Finland |
| Birthplace (normalized) | finland |
| Township / Ward | Gladstone City |
| Est. Birth Year | ~1875 |
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 |
|---|---|---|---|---|
| Leonard Johnson | Son | — | 27 | ~1913 |
| Katherine Johnson | Spouse | — | 65 | ~1875 |
| Theodore Johnson | Son | — | 32 | ~1908 |
| Fredrick Johnson | Head | — | 69 | ~1871 |
Census Appearances
1920
Delta, Michigan
Spouse, age 45
Delta, Michigan · implied b. ~1875 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Katherine |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 45 |
| Marital Status | Married |
| Birthplace | Finland |
| Year of Immigration | 1891 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Finland |
| Mother's Birthplace | Finland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Swedish |
| Birth Country | Finland |
| Birthplace (normalized) | finland |
1930
Delta, Michigan
Spouse, age 55
Delta, Michigan · implied b. ~1875 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Kathrina |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 55 |
| Marital Status | Married |
| Birthplace | Finland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1896 |
| Age at First Marriage | 23 |
| Father's Birthplace | Finland |
| Mother's Birthplace | Finland |
| Can Read/Write | Yes |
| Mother Tongue | Swedish |
| Birth Country | Finland |
| Birthplace (normalized) | finland |
1940
Delta-County, Michigan
Spouse, age 65
Delta-County, Michigan · implied b. ~1875 — 4 household members
| Surname | Johnson |
| Given Name | Katherine |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 65 |
| Marital Status | Married |
| Birthplace | Finland |
| 1935 Residence (City) | Gladstone city |
| 1935 Residence (County) | Delta |
| Naturalization Status | Naturalized |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth Country | Finland |
| Birthplace (normalized) | finland |
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.
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This person
Anchor record
Katherine Johnson
Spouse · 1940 · age 65 · b. ~1875 · Michigan
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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 — Delta-County, Michigan
Open full size
1940 US Federal Census — Delta-County, Michigan
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01745-00714)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Edla Lindberg | 68 | wife | — | Finland |
| 2 | Edith Lindberg | 31 | daughter | Teacher | Michigan |
| 3 | Alfred Lindberg | 27 | son | Gas Station Attendant | Michigan |
| 4 | George Lindberg | 23 | son | Laborer | Michigan |
| 5 | Albert Mattson | 39 | Head | Lathe Operator | Michigan |
| 6 | Sadie Mattson | 28 | wife | — | Michigan |
| 7 | Lois Mattson | 1 | daughter | — | Michigan |
| 8 | Edla Mattson | 71 | Head | — | Finland |
| 9 | Edwin Mattson | 40 | son | Senior Musician | Michigan |
| 10 | Fredrick Johnson | 69 | Head | — | Finland |
| 11 | Katherine Johnson THIS PERSON | 65 | wife | — | Finland |
| 12 | Theodore Johnson | 32 | son | Barber | Michigan |
| 13 | Leonard Johnson | 27 | son | Glue Machine Operator | Michigan |
| 14 | Torval Mackie | 32 | Head | Laborer | Michigan |
| 15 | Mary Mackie | 26 | wife | — | Washington |
| 16 | John Mackie | 6 | son | — | Michigan |
| 17 | James Mackie | 5 | son | — | Michigan |
| 18 | Otto Pade | 68 | Head | Laborer | Finland |
| 19 | Sophia Pade | 67 | wife | — | Finland |
| 20 | Lucien, Richard Pade | 11 | grandson | — | Michigan |
| 21 | George Stemas | 31 | Head | Engine Co. R.R. | Wisconsin |
| 22 | Mildred Stemas | 25 | wife | — | Wisconsin |
| 23 | Emily Anderson | 18 | sister in law | Maid | Wisconsin |
| 24 | Mary Erickson | 69 | Head | — | Finland |
| 25 | Walter Nehmer | 33 | Head | Delivery Man | Michigan |
| 26 | Bertha Nehmer | 29 | wife | — | Michigan |
| 27 | Catherine Nehmer | 7 | daughter | — | Michigan |
| 28 | Axel Nylund | 65 | Head | — | Finland |
| 29 | Mary Nylund | 60 | wife | — | Finland |
| 30 | John Nylund | 36 | son | Laborer | Michigan |
| 31 | Kenneth Nylund | 20 | son | Laborer | Michigan |
| 32 | Ray Strand | 46 | Head | Building Custodian | Finland |
| 33 | Alice Strand | 34 | wife | — | Michigan |
| 34 | Jeanette Strand | 12 | daughter | — | Illinois |
| 35 | Clarence Tardiff | 44 | Head | Watchman | Michigan |
| 36 | Elizabeth Tardiff | 37 | wife | — | Michigan |
| 37 | Audrey Tardiff | 15 | daughter | — | Michigan |
| 38 | Elaine Tardiff | 14 | daughter | — | Michigan |
| 39 | Beverly Tardiff | 12 | daughter | — | Michigan |
| 40 | Donald Tardiff | 11 | son | — | Michigan |
Related Census Records
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)