Mary Foster — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Cook-County, Illinois

Our Model Tree links this Mary Foster across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a spouse (b.~1898), then head of a 4-person household.

Age 42 b. ~1898 Female Spouse Born: Illinois Married

1940 Census Record Details

Census Year	1940
Location	Cook-County, Illinois
Surname	Foster
Given Name	Mary
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	42
Marital Status	Married
Birthplace	Illinois
1935 Residence (City)	Chicago City
1935 Residence (County)	Cook
Additional Details
Occupation	Housewife
Industry	Home
Class of Worker	H
Income (1939)	0
Highest Grade	H-2
1935 Residence	Same place
Birth State	Illinois
Birth Country	United States
Birthplace (normalized)	illinois
Occupation	Housewife
Township / Ward	Chicago City
Est. Birth Year	~1898

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
Mary Foster	Daughter	—	19	~1921
Paulette Foster	Daughter	—	17	~1923
John Foster	Head	—	44	~1896
Mary Foster	Spouse	—	42	~1898

Census Appearances

1920

Cook, Illinois

Other, age 22

Cook, Illinois · implied b. ~1898 — 6 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Foster
Given Name	Mary
Relationship to Head	Daughter-in-law
Sex	F
Color / Race	White
Age	22
Marital Status	Married
Birthplace	Illinois
Father's Birthplace	Illinois
Mother's Birthplace	Illinois
Can Read	Yes
Can Write	Yes
Speaks English	Yes
Birth State	Illinois
Birth Country	United States
Birthplace (normalized)	illinois

1930

Cook, Illinois

Spouse, age 32

Cook, Illinois · implied b. ~1898 — 4 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Foster
Given Name	Mary
Relationship to Head	wife
Sex	F
Color / Race	White
Age	32
Marital Status	Married
Birthplace	Illinois
Age at First Marriage	21
Father's Birthplace	Illinois
Mother's Birthplace	Illinois
Occupation	none
Can Read/Write	Yes
Birth State	Illinois
Birth Country	United States
Birthplace (normalized)	illinois

1940

Cook-County, Illinois

Spouse, age 42

Cook-County, Illinois · implied b. ~1898 — 4 household members

Surname	Foster
Given Name	Mary
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	42
Marital Status	Married
Birthplace	Illinois
1935 Residence (City)	Chicago City
1935 Residence (County)	Cook
Occupation	Housewife
Industry	Home
Class of Worker	H
Income (1939)	0
Highest Grade	H-2
1935 Residence	Same place
Birth State	Illinois
Birth Country	United States
Birthplace (normalized)	illinois

Model Tree

Linked across censuses

Our Model Tree links Mary Foster 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 Foster

Spouse · 1940 · age 42 · b. ~1898 · Illinois

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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 — Cook-County, Illinois Open full size

Page Contents

40 people indexed on this census page (nara:1940:m-t0627-00939-00744)

Line	Name	Age	Relation	Occupation	Birthplace
41	Minnie Riley	48	Head	Housewife	Illinois
42	Dolores Riley	8	Daughter	—	Illinois
43	Calvin Riley	5	Son	—	Illinois
44	Mary Lou Riley	2	Daughter	—	Illinois
45	Carl Frischkorn	62	Head	Printing Pressman	Germany
46	Ruth B. Frischkorn	54	Wife	Housewife	Indiana
47	Doris Frischkorn	19	Daughter	—	Illinois
48	Edwin Frischkorn	15	Son	—	Illinois
49	Michael Wasilis	52	Head	Brass Finisher	Poland
50	John Wasilis	83	Father	—	Poland
51	John Mayer	37	Head	Car Builder	Poland
52	Stella Mayer	36	Wife	Laundry Help	Illinois
53	John Jr. Mayer	9	Son	—	Illinois
54	Leonard Mayer	8	Son	—	Illinois
55	Arthur Hertel	27	Head	Carpenter	Illinois
56	Margaret Hertel	26	Wife	Housewife	Illinois
57	William Hertel	3	Son	—	Illinois
58	George Dugan	43	Head	Car Builder	Austria-Hung
59	Antoinette Dugan	42	Wife	Housewife	Austria-Hung
60	Helen Dugan	20	Daughter	Factory Helper	Illinois
61	Louis Dugan	19	Son	New Work	Illinois
62	Tillie Dugan	15	Daughter	—	Illinois
63	Frank Debka	61	Head	Painter	Poland
64	Anna Debka	58	Wife	Housewife	Poland
65	Alice Stecks	63	Head	Housewife	Poland
66	Margaret Stecks	89	Mother	—	Ireland
67	John Stotsky	51	Head	Shearman	Russia
68	Ann Stotsky	48	Wife	Housewife	Russia
69	Lydia Stotsky	25	Daughter	Asst. Accountant	Illinois
70	Nina Stotsky	22	Daughter	Comptometer	Illinois
71	John Wm. Foster	44	Head	Leader	Illinois
72	Mary Foster THIS PERSON	42	Wife	Housewife	Illinois
73	Mary Lou Foster	19	Daughter	Stenographer	Illinois
74	Paulette Foster	17	Daughter	—	Illinois
75	Joseph Wrobel	44	Head	Punch Operator	Poland
76	Sophie Wrobel	45	Wife	Housewife	Poland
77	Stella Wrobel	20	Daughter	Stock Clerk	Illinois
78	Bernice Wrobel	19	Daughter	Office Girl	Illinois
79	John Labus	45	Head	Laborer	Poland
80	Mary Labus	39	Wife	Housewife	Poland

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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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