Ruth Cooper — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Pennington-County, South Dakota

Our Model Tree links this Ruth Cooper across the 1920, 1930 and 1940 US Censuses in Pennington-County, South Dakota (XGBoost, ~Confirmed) — first a spouse (b.~1899), then head of a 5-person household.

Age 41 b. ~1899 Female Spouse Born: Iowa Married

1940 Census Record Details

Census Year	1940
Location	Pennington-County, South Dakota
Surname	Cooper
Given Name	Ruth
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	41
Marital Status	Married
Birthplace	Iowa
1935 Residence (City)	Rapid City
1935 Residence (County)	Pennington
Additional Details
Highest Grade	Hs 4
1935 Residence	Same place
Birth State	Iowa
Birth Country	United States
Birthplace (normalized)	iowa
Township / Ward	Rapid City
Est. Birth Year	~1899

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.

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

Name	Relation to head	Relative to Ruth	Age	Birth yr
Ruth Cooper	Spouse	—	41	~1899
Stanley Desersa	Daughter	—	3	~1937
Alice Desersa	Daughter	—	19	~1921
Esther Cooper	Daughter	—	17	~1923
Lloyd Cooper	Son	—	14	~1926

Census Appearances

1920

Pennington, South …

Spouse, age 21

Pennington, South Dakota · implied b. ~1899 — 2 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Cooper
Given Name	Ruth S
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	21
Marital Status	Married
Birthplace	Iowa
Father's Birthplace	Illinois
Mother's Birthplace	Pennsylvania
Can Read	Yes
Can Write	Yes
Speaks English	Yes
Birth State	Iowa
Birth Country	United States
Birthplace (normalized)	iowa

1930

Pennington, South …

Other, age 32

Pennington, South Dakota · implied b. ~1898 — 6 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Cooper
Given Name	Ruth B
Relationship to Head	Wife-H
Sex	F
Color / Race	White
Age	32
Marital Status	Married
Birthplace	Iowa
Age at First Marriage	20
Father's Birthplace	Illinois
Mother's Birthplace	Pennsylvania
Can Read/Write	Yes
Birth State	Iowa
Birth Country	United States
Birthplace (normalized)	iowa

1940

Pennington-County, South …

Spouse, age 41

Pennington-County, South Dakota · implied b. ~1899 — 5 household members

Surname	Cooper
Given Name	Ruth
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	41
Marital Status	Married
Birthplace	Iowa
1935 Residence (City)	Rapid City
1935 Residence (County)	Pennington
Highest Grade	Hs 4
1935 Residence	Same place
Birth State	Iowa
Birth Country	United States
Birthplace (normalized)	iowa

Model Tree

Linked across censuses

Our Model Tree links Ruth Cooper across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.

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This person

Anchor record

Ruth Cooper

Spouse · 1940 · age 41 · b. ~1899 · South Dakota

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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 — Pennington-County, South Dakota Open full size

Page Contents

40 people indexed on this census page (nara:1940:m-t0627-03865-00621)

Line	Name	Age	Relation	Occupation	Birthplace
41	Ruth Cooper THIS PERSON	41	Wife	—	Iowa
42	Esther Cooper	17	Daughter	—	So. Dak.
43	Lloyd Cooper	14	Son	—	So. Dak.
44	Alice Desersa	19	Daughter	Housework	So. Dak.
45	Stanley Desersa	3	Daughter	—	So. Dak.
46	Sanford Co. Anderson	58	Head	Foreman Blade Operator	North Carolina
47	Nellie R. Anderson	49	Wife	—	North Dakota
48	Verne Vaught	23	Head	Driver	South Dak.
49	Eva Vaught	22	Wife	—	South Dak.
50	Henry Houtzenroeder	51	Head	Blacksmith	New York
51	Elizabeth Houtzenroeder	42	Wife	—	Germany
52	Gale Houtzenroeder	12	Son	—	South Dak.
53	Alvin Houtzenroeder	8	Son	—	South Dak.
54	Evelyn Houtzenroeder	5	Daughter	—	South Dak.
55	Benjamin Decory	63	Head	Laborer	Nebraska
56	Ada Decory	50	Wife	—	Missouri
57	Harold Ellingson	27	Head	Helper Electric Crane	South Dak.
58	Mae Ellingson	22	Wife	—	Montana
59	Benny Ellingson	2	Son	—	So. Dak.
60	John Millette	49	Head	Laborer	South Dak.
61	Myrtle Millette	44	Wife	—	South Dak.
62	Eugene Millette	17	Son	Laborer	So. Dak.
63	Idella Millette	14	Daughter	—	So. Dak.
64	John Jr. Millette	11	Son	—	So. Dak.
65	Bonnie Millette	8	Daughter	—	So. Dak.
66	Betty Lou Millette	5	Daughter	—	So. Dak.
67	James L. Millette	1	Son	—	So. Dak.
68	Fronia Ehrler	57	Head	Sewing	South Dakota
69	Frank B. Koch	47	Head	Merchant	South Dakota
70	Sena Koch	37	Wife	—	Iowa
71	Russell Koch	16	Son	—	South Dak.
72	Iona Koch	15	Daughter	—	So. Dak.
73	Royal Koch	12	Son	—	So. Dak.
74	Ruby Koch	9	Daughter	—	So. Dak.
75	Scott Cope	33	Head	Baker	Missouri
76	Wilma Cope	21	Wife	—	South Dak.
77	Robert Cope	12	Son	—	Iowa
78	Dennis Cope	1	Son	—	South Dakota
79	Oliver Albertson	64	Head	Crusher Operator	Wisconsin
80	Ida Albertson	64	Wife	—	Pennsylvania

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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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