Mary Cook — 1940 US Census Record

Model Tree available

1940 United States Federal Census · Polk-County, Iowa

Our Model Tree links this Mary Cook across the 1920, 1930 and 1940 US Censuses in Polk-County, Iowa (XGBoost, ~Confirmed), with identified parents Pearl — first a spouse (b.~1919), then head of a 4-person household.

Age 21 b. ~1919 Female Spouse Born: Iowa Married

1940 Census Record Details

Census Year	1940
Location	Polk-County, Iowa
Surname	Cook
Given Name	Mary E
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	21
Marital Status	Married
Birthplace	Iowa
1935 Residence (City)	North West Des Moines
1935 Residence (County)	Polk
Additional Details
Highest Grade	No 1
1935 Residence	Same place
Birth State	Iowa
Birth Country	United States
Birthplace (normalized)	iowa
Township / Ward	North West Des Moines
Est. Birth Year	~1919

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 Mary	Age	Birth yr
Merry Cook	Daughter	—	3	~1937
Carl Cook	Head	—	27	~1913
Carl Cook	Son	—	1	~1939
Mary Cook	Spouse	—	21	~1919

Census Appearances

1920

Polk, Iowa

Daughter, age 4

Polk, Iowa · implied b. ~1916 — 2 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Cook
Given Name	Mary
Relationship to Head	daughter
Sex	F
Color / Race	White
Age	4
Marital Status	Single
Birthplace	Iowa
Father's Birthplace	Wisconsin
Mother's Birthplace	Illinois
Birth State	Iowa
Birth Country	United States
Birthplace (normalized)	iowa

1930

Polk, Iowa

Daughter, age 14

Polk, Iowa · implied b. ~1916 — 5 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Cook
Given Name	Mary A.
Relationship to Head	Daughter
Sex	F
Color / Race	White
Age	14
Marital Status	Single
Birthplace	Iowa
Father's Birthplace	Wisconsin
Mother's Birthplace	Illinois
Can Read/Write	Yes
Birth State	Iowa
Birth Country	United States
Birthplace (normalized)	iowa

1940

Polk-County, Iowa

Spouse, age 21

Polk-County, Iowa · implied b. ~1919 — 4 household members

Surname	Cook
Given Name	Mary E
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	21
Marital Status	Married
Birthplace	Iowa
1935 Residence (City)	North West Des Moines
1935 Residence (County)	Polk
Highest Grade	No 1
1935 Residence	Same place
Birth State	Iowa
Birth Country	United States
Birthplace (normalized)	iowa

Model Tree

Model Tree available

Our Model Tree links Mary Cook across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Pearl Cook (~0.92 confidence). The pedigree spans 1 generation with 1 identified ancestor.

Show:

Gen 1 Parents confidence ≈ 0.92

Mother

Pearl Cook

b. ~1885

Source mother

● Household · direct · ~0.92

This person

Anchor record

Mary Cook

Spouse · 1940 · age 21 · b. ~1919 · Iowa

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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 — Polk-County, Iowa Open full size

Page Contents

40 people indexed on this census page (nara:1940:m-t0627-01192-00971)

Line	Name	Age	Relation	Occupation	Birthplace
41	Dale A Clark	42	Head	Stationary Boiler Fireman	Iowa
42	Janice J Clark	34	Wife	—	Iowa
43	Bernard Wilson	41	Head	Silk Spotter	Iowa
44	Alta Wilson	35	Wife	—	Missouri
45	Willard E Nolte	27	Head	Clerk	Iowa
46	Ilene L Nolte	22	Wife	—	Iowa
47	Alva L Baldwin	34	Head	Laborer	Iowa
48	Mamie B Baldwin	29	Wife	Waitress	Iowa
49	Edna M Baldwin	9	Daughter	—	Iowa
50	James L Baldwin	6	Son	—	Iowa
51	Frederick E Reed	55	Head	Carpenter	Iowa
52	Carl E Cook	27	Head	Clerk	Iowa
53	Mary E Cook THIS PERSON	21	Wife	—	Iowa
54	Merry Lee Cook	3	Daughter	—	Iowa
55	Carl Richard Cook	1	Son	—	Iowa
56	Carl M Wolff	28	Head	Stock Cutter	Iowa
57	Dorothy L Wolff	24	Wife	—	Nebraska
58	Doris J Wolff	5	Daughter	—	Iowa
59	Lester E Viers	33	Head	Plasterer	Iowa
60	Mildred A Viers	27	Wife	—	Illinois
61	Carl E Viers	10	Son	—	Iowa
62	Luella M Viers	5	Daughter	—	Iowa
63	Kermit K Viers	1	Son	—	Iowa
64	Earnest O Pearson	36	Head	Laborer	Iowa
65	Flora Pearson	27	Wife	—	Iowa
66	Ardeen Pearson	9	Son	—	Iowa
67	Mary Lucile Pearson	3	Daughter	—	Iowa
68	Basil C Olsen	28	Head	District Manager	Iowa
69	Nelle M Olsen	26	Wife	—	Nebraska
70	John B Olsen	0	Son	—	Iowa
71	James A Gilroy	32	Head	Salesman	Iowa
72	Irene Gilroy	37	Wife	Cashier	Iowa
73	John Dhainin	34	Head	Gardner	Iowa
74	Elizabeth R Dhainin	34	Wife	—	Iowa
75	Roy Ehle	43	Head	Manager	Iowa
76	May E Ehle	39	Wife	Phone Operator	Missouri
77	John F Risenwick	42	Head	Branch Manager	Iowa
78	Hazel Boyle Risenwick	47	Wife	—	Iowa
79	John Risenwick	14	Son	—	Iowa
80	Wendel Turlitlow	40	Head	Plasterer	Iowa

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Pedigree Summary

Mary

Gen 1 · 1 parents ~0.92

Max depth 4 (1900–1950 window)

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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