Mary Anderson — 1940 US Census Record

Linked across censuses

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

Our Model Tree links this Mary Anderson across the 1920, 1930 and 1940 US Censuses in Clark-County, South Dakota (XGBoost, ~Confirmed) — first a spouse (b.~1900), then head of a 5-person household.

Age 40 b. ~1900 Female Spouse Born: Belgium Married

1940 Census Record Details

Census Year	1940
Location	Clark-County, South Dakota
Surname	Anderson
Given Name	Mary K.
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	40
Marital Status	Married
Birthplace	Belgium
1935 Residence (City)	Mt. Pleasant Twp
1935 Residence (County)	Clark
Naturalization Status	Alien
Additional Details
Highest Grade	Hs 4
1935 Residence	Same place
Birth Country	Belgium
Birthplace (normalized)	belgium
Township / Ward	Mt Pleasant Twp
Est. Birth Year	~1900

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 Mary	Age	Birth yr
Conrad Anderson	Head	—	47	~1893
Carl Anderson	Son	—	18	~1922
Henry Anderson	Son	—	11	~1929
John Anderson	Son	—	19	~1921
Mary Anderson	Spouse	—	40	~1900

Census Appearances

1920

None, None

Other, age 18

None, None · implied b. ~1902 — 4 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Anderson
Given Name	Mary L.
Sex	F
Color / Race	White
Age	18
Marital Status	Married
Birthplace	Belgium
Naturalization Status	Alien
Father's Birthplace	Belgium
Mother's Birthplace	Belgium
Can Read	Yes
Can Write	Yes
Speaks English	Yes
Mother Tongue	Belgian
Birth Country	Belgium
Birthplace (normalized)	belgium

1930

Clark, South …

Other, age 29

Clark, South Dakota · implied b. ~1901 — 6 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Anderson
Given Name	Mary
Relationship to Head	Wife-H
Sex	F
Color / Race	White
Age	29
Marital Status	Married
Birthplace	Belgium
Age at First Marriage	1916
Father's Birthplace	Belgium
Mother's Birthplace	Belgium
Class of Worker	17
Can Read/Write	Yes
Mother Tongue	Flemish
Birth Country	Belgium
Birthplace (normalized)	belgium

1940

Clark-County, South …

Spouse, age 40

Clark-County, South Dakota · implied b. ~1900 — 5 household members

Surname	Anderson
Given Name	Mary K.
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	40
Marital Status	Married
Birthplace	Belgium
1935 Residence (City)	Mt. Pleasant Twp
1935 Residence (County)	Clark
Naturalization Status	Alien
Highest Grade	Hs 4
1935 Residence	Same place
Birth Country	Belgium
Birthplace (normalized)	belgium

Model Tree

Linked across censuses

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

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This person

Anchor record

Mary Anderson

Spouse · 1940 · age 40 · b. ~1900 · 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 — Clark-County, South Dakota Open full size

Page Contents

40 people indexed on this census page (nara:1940:m-t0627-03851-00622)

Line	Name	Age	Relation	Occupation	Birthplace
1	William F. Cypher	55	Hired help	Farm Laborer	So. Dakota
2	Joseph J. Wolf	69	Head	Farmer	Irish Free State
3	Mary Wolf	58	Wife	—	Nebraska
4	John H. Wolf	22	Son	Farm Laborer	So. Dak
5	Cassius L. Hutchinson	65	Head	Farmer	Iowa
6	Bertha A. Hutchinson	54	Wife	—	So. Dak
7	William Ed D. Hutchinson	37	Hired man	Farm Laborer	Oklahoma
8	Archie A. Johnson	60	Head	Farmer	Illinois
9	Rena Johnson	45	Wife	—	Illinois
10	Royal Johnson	19	Son	Farm Laborer	So. Dak
11	Robert Johnson	8	Son	—	So. Dak
12	Roe Wood	62	Head	Farmer	Wisc.
13	Hannah Wood	58	Wife	—	Wisc.
14	Donald W. Wood	17	Son	Farm Laborer	So. Dak
15	Lloyd Wood	34	Son	Farm Laborer	So. Dak
16	Edna C. Wood	34	Daughter in law	—	Iowa
17	Jerry J. Wood	3	Grandson	—	So. Dak
18	Ole A. V. Euen	53	Head	Farmer	Minnesota
19	Sadie B. Euen	55	Wife	—	Minnesota
20	Ellen A. Euen	19	Daughter	—	So. Dak
21	Albin L. X. Waldo	45	Head	Farmer	Iowa
22	Exie I. Waldo	42	Wife	—	Iowa
23	Oscar E. Elagens	33	Head	Farmer	So. Dak
24	Gladys E. Elagens	28	Wife	Farmer	So. Dak
25	Ethel M. Elagens	16	Daughter in law	—	So. Dak
26	Lois E. Elagens	20	Daughter	Bookkeeper	So. Dak
27	Howard B. Elagens	13	Son	—	So. Dak
28	Conrad C. Anderson	47	Head	Farmer	Sweden
29	Mary K. Anderson THIS PERSON	40	Wife	—	Belgium
30	John A. Anderson	19	Son	Farmer	So. Dakota
31	Carl R. Anderson	18	Son	Farm Laborer	So. Dakota
32	Henry D. Anderson	11	Son	—	So. Dakota
33	Ernest C. X. Cornell	37	Head	Farmer	Minnesota
34	Libbie J. Cornell	30	Wife	—	Minnesota
35	Link A. Wiley	44	Head	Farmer	So. Dak
36	Ruby E. X. Wiley	38	Wife	—	So. Dak
37	Kenneth J. Wiley	16	Son	Farm Laborer	So. Dak
38	Iris E. Wiley	13	Daughter	—	So. Dak
39	Robert R. Wiley	9	Son	—	So. Dak
40	Beverley J. Wiley	8	Daughter	—	So. Dak

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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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