Mary Coyle — 1940 US Census Record

Linked across censuses

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

Our Model Tree links this Mary Coyle across the 1920, 1930 and 1940 US Censuses in Union-County, South Dakota (XGBoost, ~Confirmed) — first a spouse (b.~1878), then head of a 3-person household.

Age 62 b. ~1878 Female Spouse Born: South Dakota Married

1940 Census Record Details

Census Year	1940
Location	Union-County, South Dakota
Surname	Coyle
Given Name	Mary A.
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	62
Marital Status	Married
Birthplace	South Dakota
1935 Residence (City)	Sioux Valley
1935 Residence (County)	Union
Additional Details
Highest Grade	No 3
1935 Residence	Same house
Birth State	South Dakota
Birth Country	United States
Birthplace (normalized)	south dakota
Township / Ward	Sioux Valley
Est. Birth Year	~1878

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.

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

Name	Relation to head	Relative to Mary	Age	Birth yr
Carmel Coyle	Daughter	—	37	~1903
Mary Coyle	Spouse	—	62	~1878
Frank Coyle	Head	—	59	~1881

Census Appearances

1920

Union, South …

Spouse, age 41

Union, South Dakota · implied b. ~1879 — 3 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Coyle
Given Name	Mary W
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	41
Marital Status	Married
Birthplace	South Dakota
Father's Birthplace	Ireland
Mother's Birthplace	Canada
Can Read	Yes
Can Write	Yes
Speaks English	Yes
Mother Tongue	Eng
Birth State	South Dakota
Birth Country	United States
Birthplace (normalized)	south dakota

1930

Union, South …

Spouse, age 50

Union, South Dakota · implied b. ~1880 — 3 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Coyle
Given Name	Mary
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	50
Marital Status	Married
Birthplace	South Dakota
Age at First Marriage	23
Father's Birthplace	Ireland
Mother's Birthplace	Canada
Can Read/Write	Yes
Birth State	South Dakota
Birth Country	United States
Birthplace (normalized)	south dakota

1940

Union-County, South …

Spouse, age 62

Union-County, South Dakota · implied b. ~1878 — 3 household members

Surname	Coyle
Given Name	Mary A.
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	62
Marital Status	Married
Birthplace	South Dakota
1935 Residence (City)	Sioux Valley
1935 Residence (County)	Union
Highest Grade	No 3
1935 Residence	Same house
Birth State	South Dakota
Birth Country	United States
Birthplace (normalized)	south dakota

Model Tree

Linked across censuses

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

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This person

Anchor record

Mary Coyle

Spouse · 1940 · age 62 · b. ~1878 · 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 — Union-County, South Dakota Open full size

Page Contents

40 people indexed on this census page (nara:1940:m-t0627-03869-00308)

Line	Name	Age	Relation	Occupation	Birthplace
41	Clayton	25	Son	Laborer	South Dakota
42	Roy Carlson	29	Head	Laborer	South Dakota
43	Morris Carlson	24	Wife	Laborer	South Dakota
44	Lois Carlson	5	Daughter	—	South Dakota
45	Lucile Carlson	3	Daughter	—	South Dakota
46	August A. Anderson	66	Head	—	Sweden
47	Catherine Schreiderberry	42	Daughter	—	Illinois
48	Leo Houlton	30	Head	Farmer	South Dakota
49	Lila Houlton	25	Wife	—	Iowa
50	Colleen Houlton	3	Daughter	—	South Dakota
51	Larry Houlton	1	Son	—	South Dakota
52	Chas. Boden	73	Head	—	Iowa
53	Elizabeth Boden	69	Wife	—	Iowa
54	Elmer Boden	32	Son	—	South Dakota
55	Everett P. Coyle	35	Head	Farmer	South Dakota
56	Cordelia Coyle	34	Wife	Farmer	South Dakota
57	Richard Coyle	12	Son	—	South Dakota
58	Shirley Coyle	10	Daughter	—	South Dakota
59	Jerome Coyle	6	Son	—	South Dakota
60	Joan Coyle	5	Daughter	—	South Dakota
61	Patricia Coyle	3	Daughter	—	South Dakota
62	Frank Coyle	59	Head	Farmer	Wisconsin
63	Mary A. Coyle THIS PERSON	62	Wife	—	South Dakota
64	Carmel Coyle	37	Daughter	—	South Dakota
65	Clifford Groom	32	Head	Farmer	South Dakota
66	Nelia Groom	28	Wife	—	South Dakota
67	Roger Groom	6	Son	—	South Dakota
68	Edwin Groom	3	Son	—	South Dakota
69	Elmer Hultgren	55	Head	Commissioner	South Dakota
70	Adina Hultgren	50	Wife	—	South Dakota
71	Kenneth Hultgren	26	Son	Farmer	South Dakota
72	Russell Hultgren	23	Son	Farmer	South Dakota
73	Earl Hultgren	19	Son	Laborer	South Dakota
74	Pearl Nilzacke	21	Maid	Maid	Iowa
75	Ray Sikes	27	Head	Farmer	South Dakota
76	Marian Sikes	28	Wife	—	South Dakota
77	Eldor Meske	25	Hired Hand	Laborer	Iowa
78	John Joustra	43	Head	Farmer	Mass.
79	Viola Joustra	42	Wife	—	South Dakota
80	Cleo Joustra	19	Daughter	—	South Dakota

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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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