Katherine Johnson — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Todd-County, Minnesota

Our Model Tree links this Katherine Johnson across the 1920, 1930 and 1940 US Censuses in Todd-County, Minnesota (XGBoost, ~Confirmed) — first a spouse (b.~1880), then head of a 6-person household.

Age 60 b. ~1880 Female Spouse Born: Nebraska Married

1940 Census Record Details

Census Year	1940
Location	Todd-County, Minnesota
Surname	Johnson
Given Name	Katherine
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	60
Marital Status	Married
Birthplace	Nebraska
1935 Residence (City)	Ward Township
1935 Residence (County)	Todd
Additional Details
Industry	0
Highest Grade	No 7
1935 Residence	Same place
Birth State	Nebraska
Birth Country	United States
Birthplace (normalized)	nebraska
Township / Ward	Ward Township
Est. Birth Year	~1880

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.

6 people recorded at the same address in the 1940 census.

Name	Relation to head	Relative to Katherine	Age	Birth yr
Richard Johnson	Son	—	19	~1921
Katherine Johnson	Spouse	—	60	~1880
Charles Johnson	Head	—	73	~1867
Melvin Johnson	Son	—	32	~1908
Harry Johnson	Son	—	37	~1903
Crist Johnson	Son	—	39	~1901

Census Appearances

1920

Todd, Minnesota

Spouse, age 41

Todd, Minnesota · implied b. ~1879 — 6 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Johnson
Given Name	Katherine
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	41
Marital Status	Married
Birthplace	Nebraska
Father's Birthplace	Denmark
Mother's Birthplace	Denmark
Occupation	none
Can Read	Yes
Can Write	Yes
Speaks English	Danish
Mother Tongue	Danish
Birth State	Nebraska
Birth Country	United States
Birthplace (normalized)	nebraska

1930

Todd, Minnesota

Spouse, age 51

Todd, Minnesota · implied b. ~1879 — 6 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Johnson
Given Name	Katy
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	51
Marital Status	Married
Birthplace	Nebraska
Age at First Marriage	19
Father's Birthplace	Denmark
Mother's Birthplace	Denmark
Can Read/Write	Yes
Birth State	Nebraska
Birth Country	United States
Birthplace (normalized)	nebraska

1940

Todd-County, Minnesota

Spouse, age 60

Todd-County, Minnesota · implied b. ~1880 — 6 household members

Surname	Johnson
Given Name	Katherine
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	60
Marital Status	Married
Birthplace	Nebraska
1935 Residence (City)	Ward Township
1935 Residence (County)	Todd
Industry	0
Highest Grade	No 7
1935 Residence	Same place
Birth State	Nebraska
Birth Country	United States
Birthplace (normalized)	nebraska

Model Tree

Linked across censuses

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 60 · b. ~1880 · Minnesota

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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 — Todd-County, Minnesota Open full size

Page Contents

40 people indexed on this census page (nara:1940:m-t0627-01964-00753)

Line	Name	Age	Relation	Occupation	Birthplace
41	John Bichard	28	Son	Farm Laborer	Minnesota
42	Howard E. Johnson	44	Head	Laborer	Minnesota
43	Esther Johnson	37	Wife	—	Minnesota
44	Eugene Johnson	17	Son	—	Minnesota
45	Morris Johnson	16	Son	—	Minnesota
46	Raymond Johnson	4	Son	—	Minnesota
47	James Thomson	24	Head	Laborer	Canada-English
48	Donna Thomson	19	Wife	—	Minnesota
49	Donald Thomson	1	Son	—	Minnesota
50	Cleon Thomson	0	Daughter	—	Minnesota
51	William Holmquist	51	Head	Farmer	Sweden
52	Anna Holmquist	65	Head	—	Sweden
53	Hanna Holmquist	75	Sister	—	Sweden
54	James Mc Donald	41	Head	Farmer	Minnesota
55	Anna Mc Donald	38	Wife	—	Minnesota
56	James Jr. Mc Donald	12	Son	—	Minnesota
57	Jeanine Mc Donald	11	Daughter	—	Minnesota
58	Anthony Mc Donald	30	Brother	Farm Laborer	Minnesota
59	Adolph Frank	76	Head	—	Indiana
60	Stephen Smyrak	43	Head	Farmer	Minnesota
61	Casper Smyrak	74	Father	—	Poland
62	Joseph Heitz	59	Head	Farmer	Minnesota
63	Sadie Heitz	52	Wife	—	Minnesota
64	Genevieve Heitz	20	Daughter	—	Minnesota
65	Daniel Heitz	16	Son	Farm Laborer	Minnesota
66	Charles Johnson	73	Head	Farmer	Norway
67	Katherine Johnson THIS PERSON	60	Wife	—	Nebraska
68	Crist Johnson	39	Son	Farmer	Minnesota
69	Harry Johnson	37	Son	Farmer	Minnesota
70	Melvin Johnson	32	Son	Farm Laborer	Minnesota
71	Richard Johnson	19	Son	Farm Laborer	Minnesota
72	Vincent Martinek	49	Head	Farmer	Illinois
73	Hilda Martinek	35	Wife	—	Minnesota
74	Arnold Martinek	13	Son	—	Minnesota
75	Laverne Martinek	11	Son	—	Minnesota
76	Margie Martinek	7	Daughter	—	Minnesota
77	Oscar Carlson	44	Head	Farmer	Iowa
78	Lenora Carlson	40	Wife	—	Minnesota
79	Ann Carlson	20	Daughter	—	Minnesota
80	Florence Carlson	17	Daughter	—	Minnesota

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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)

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