KJ
Katherine Johnson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · St.-Louis-County, Minnesota
Our Model Tree links this Katherine Johnson across the 1900, 1910, 1920, 1930 and 1940 US Censuses in St.-Louis-County, Minnesota (XGBoost, ~Confirmed) — first a spouse (b.~1874), then head of a 4-person household.
Age 66
b. ~1874
Female
Spouse
Born: Finland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | St.-Louis-County, Minnesota |
| Surname | Johnson |
| Given Name | Katherine |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 66 |
| Marital Status | Married |
| Birthplace | Finland |
| 1935 Residence (City) | Soudan |
| 1935 Residence (County) | St. Louis |
| Naturalization Status | Alien |
| Additional Details | |
| Occupation | housekeeper |
| Industry | home |
| Class of Worker | NP |
| Income (1939) | 0 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth Country | Finland |
| Birthplace (normalized) | finland |
| Occupation | Housekeeper |
| Township / Ward | Soudan |
| Est. Birth Year | ~1874 |
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 |
|---|---|---|---|---|
| Katherine Johnson | Spouse | — | 66 | ~1874 |
| Harriet Johnson | Daughter | — | 16 | ~1924 |
| Theodore Johnson | Son | — | 7 | ~1933 |
| Evelyn Johnson | Daughter | — | 26 | ~1914 |
Census Appearances
1900
St Louis, …
Spouse, age 27
St Louis, Minnesota · implied b. ~1873 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Katie |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 26 |
| Marital Status | Married |
| Birthplace | Finland |
| Birth Month | July |
| Birth Year | 1873 |
| Year of Immigration | 1898 |
| Father's Birthplace | Finland |
| Mother's Birthplace | Finland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | No |
| Birth Country | Finland |
| Birthplace (normalized) | finland |
Spouse, age 36
St Louis, Minnesota · implied b. ~1874 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Katie |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 36 |
| Marital Status | Married |
| Birthplace | Finland |
| Years Married | 11 |
| Children Born | 6 |
| Year of Immigration | 1893 |
| Father's Birthplace | Finland |
| Mother's Birthplace | Finland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Finnish |
| Birth Country | Finland |
| Birthplace (normalized) | finland |
1920
St Louis, …
Spouse, age 46
St Louis, Minnesota · implied b. ~1874 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Katherine |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 46 |
| Marital Status | Married |
| Birthplace | Finland |
| Year of Immigration | 1892 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Finland |
| Mother's Birthplace | Finland |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Finnish |
| Birth Country | Finland |
| Year of Naturalization | 1898 |
| Birthplace (normalized) | finland |
1930
St Louis, …
Spouse, age 56
St Louis, Minnesota · implied b. ~1874 — 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 | 56 |
| Marital Status | Married |
| Birthplace | Finland |
| Naturalization Status | Alien |
| Year of Immigration | 1892 |
| Age at First Marriage | 18 |
| Father's Birthplace | Finland |
| Mother's Birthplace | Finland |
| Occupation | Farmer |
| Industry | Own Farm |
| Class of Worker | OA |
| Can Read/Write | Yes |
| Mother Tongue | Finnish |
| Birth Country | Finland |
| Birthplace (normalized) | finland |
1940
St.-Louis-County, Minnesota
Spouse, age 66
St.-Louis-County, Minnesota · implied b. ~1874 — 4 household members
| Surname | Johnson |
| Given Name | Katherine |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 66 |
| Marital Status | Married |
| Birthplace | Finland |
| 1935 Residence (City) | Soudan |
| 1935 Residence (County) | St. Louis |
| Naturalization Status | Alien |
| Occupation | housekeeper |
| Industry | home |
| Class of Worker | NP |
| Income (1939) | 0 |
| Highest Grade | H 4 |
| 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 5 US Census years (1900, 1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Katherine Johnson
Spouse · 1940 · age 66 · b. ~1874 · Minnesota
★ 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 — St.-Louis-County, Minnesota
Open full size
1940 US Federal Census — St.-Louis-County, Minnesota
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01955-00221)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Katherine Johnson THIS PERSON | 66 | wife | Housekeeper | Finland |
| 42 | Evelyn Johnson | 26 | daughter | Housekeeper | Minnesota |
| 43 | Theodore Johnson | 7 | son | — | Minnesota |
| 44 | Harriet Johnson | 16 | daughter | — | Minnesota |
| 45 | Andrew Mattson | 67 | head | — | Finland |
| 46 | Edith Mattson | 56 | wife | Housekeeper | Finland |
| 47 | Arnie Mattson | 25 | son | Laborer | Minnesota |
| 48 | Arno Mattson | 24 | son | Contracting | Minnesota |
| 49 | Matt Mattson | 72 | lodger | — | Finland |
| 50 | Rudolph H. Johnson | 28 | head | Run Machine | Minnesota |
| 51 | Ellen Johnson | 23 | wife | Housework | Minnesota |
| 52 | Fred Carlson | 36 | head | Run Machine | Minnesota |
| 53 | Elma Carlson | 33 | wife | Housekeeper | Minnesota |
| 54 | Ronald Carlson | 8 | son | — | Minnesota |
| 55 | Elsie Carlson | 6 | daughter | — | Minnesota |
| 56 | George Hemmish | 36 | head | Foreman | Minnesota |
| 57 | Ann Hemmish | 32 | wife | Housekeeper | Minnesota |
| 58 | George Hemmish | 2 | son | — | Minnesota |
| 59 | Anna Nyquist | 57 | head | Housekeeper | Finland |
| 60 | Milton Nyquist | 24 | son | Motorman | Minnesota |
| 61 | Ernest Nyquist | 22 | son | Loader | Minnesota |
| 62 | Eino Nyquist | 20 | son | Laborer | Minnesota |
| 63 | Evelyn Nyquist | 18 | daughter | Housekeeper | Minnesota |
| 64 | Albert Roy | 34 | head | Motorman | Minnesota |
| 65 | Anna Roy | 26 | wife | Assistant Cook | Minnesota |
| 66 | Jay Roy | 3 | son | — | Minnesota |
| 67 | Enoatt Kultala | 67 | head | — | Finland |
| 68 | Hugo Kultala | 38 | son | Laborer | Minnesota |
| 69 | John R. Nykanen | 33 | head | Run Machine | Minnesota |
| 70 | Selma Nykanen | 29 | wife | Housekeeper | Minnesota |
| 71 | John R.H. Nykanen | 3 | son | — | Minnesota |
| 72 | William Karpi | 42 | head | Painter | Minnesota |
| 73 | Ida Karpi | 37 | wife | Housekeeper | Minnesota |
| 74 | Eileen Karpi | 17 | daughter | — | Minnesota |
| 75 | Janet Karpi | 14 | daughter | — | Minnesota |
| 76 | Anna Danielson | 71 | head | — | Sweden |
| 77 | Edith Danielson | 43 | daughter | Housekeeper | Minnesota |
| 78 | Hugo Danielson | 41 | son | Engineer | Minnesota |
| 79 | George Hendrickson | 40 | head | Senior Clerk | Minnesota |
| 80 | Esther Hendrickson | 37 | wife | Housekeeper | Minnesota |
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)