Mary Gallagher — 1940 US Census Record

Model Tree available

1940 United States Federal Census · Cook-County, Illinois

Our Model Tree links this Mary Gallagher across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Winifred & Winifred — first a head (b.~1908), then head of a 3-person household.

Age 32 b. ~1908 Female Head Born: Illinois Widowed

1940 Census Record Details

Census Year	1940
Location	Cook-County, Illinois
Surname	Gallagher
Given Name	Mary
Relationship to Head	head
Sex	F
Color / Race	White
Age	32
Marital Status	Widowed
Birthplace	Illinois
1935 Residence (City)	Chicago
1935 Residence (County)	Cook
Additional Details
Highest Grade	H 4
1935 Residence	Same place
Birth State	Illinois
Birth Country	United States
Birthplace (normalized)	illinois
Township / Ward	Chicago
Est. Birth Year	~1908

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
Joan Gallagher	Daughter	—	13	~1927
Mary Gallagher	Head	—	32	~1908
Daniel Gallagher	Son	—	11	~1929

Census Appearances

1920

Cook, Illinois

Daughter, age 10

Cook, Illinois · implied b. ~1910 — 7 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Gallagher
Given Name	Mary
Relationship to Head	Daughter
Sex	F
Color / Race	White
Age	10
Marital Status	Single
Birthplace	Illinois
Father's Birthplace	Missouri
Mother's Birthplace	Ireland
Occupation	none
Can Read	Yes
Can Write	Yes
Speaks English	Yes
Birth State	Illinois
Birth Country	United States
Birthplace (normalized)	illinois

1930

Cook, Illinois

Daughter, age 20

Cook, Illinois · implied b. ~1910 — 2 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Gallagher
Given Name	Mary
Relationship to Head	Daughter
Sex	F
Color / Race	White
Age	20
Marital Status	Single
Birthplace	Illinois
Father's Birthplace	Missouri
Mother's Birthplace	Irish Free State
Can Read/Write	Yes
Birth State	Illinois
Birth Country	United States
Birthplace (normalized)	illinois

1940

Cook-County, Illinois

Head, age 32

Cook-County, Illinois · implied b. ~1908 — 3 household members

Surname	Gallagher
Given Name	Mary
Relationship to Head	head
Sex	F
Color / Race	White
Age	32
Marital Status	Widowed
Birthplace	Illinois
1935 Residence (City)	Chicago
1935 Residence (County)	Cook
Highest Grade	H 4
1935 Residence	Same place
Birth State	Illinois
Birth Country	United States
Birthplace (normalized)	illinois

Model Tree

Model Tree available

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

Show:

Gen 1 Parents confidence ≈ 0.92

Mother

Winifred Gallagher

b. ~1871

Source mother

● Household · direct · ~0.92

Mother

Winifred Gallagher

b. ~1878

Source mother

● Household · direct · ~0.92

This person

Anchor record

Mary Gallagher

Head · 1940 · age 32 · b. ~1908 · Illinois

★ You are viewing this record

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-t0627-00962-00739)

Line	Name	Age	Relation	Occupation	Birthplace
41	Geneva Zelenski	11	niece	—	Illinois
42	Geraldine Zelenski	1	daughter	—	Illinois
43	John Uzitas	29	head	Smelter	Illinois
44	Gertrude Uzitas	27	wife	—	Illinois
45	Francis Uzitas	2	daughter	—	Illinois
46	Margaret Rings	19	mother-in-law	Striker	Illinois
47	James Rings	54	father-in-law	—	Poland
48	Frank Leisky	32	Head	Elevator Opr.	Illinois
49	Mary Leisky	30	wife	Typist	Illinois
50	Frank Jr. Leisky	10	son	—	Illinois
51	Ronald Leisky	8	son	—	Illinois
52	Gailew Leisky	7	son	—	Illinois
53	George Leisky	23	brother	Laborer	Illinois
54	George Venett	39	head	Foreman Lamp	North Dakota
55	Ida Venett	37	wife	—	Canada
56	Ethel Venett	16	daughter	—	Illinois
57	William Venett	8	son	—	Illinois
58	Walter Locrop	45	head	Paint Trucker	Holland
59	Maria Locrop	37	wife	—	Illinois
60	Marjorie Locrop	11	daughter	—	Illinois
61	Richard Locrop	7	son	—	Illinois
62	Audrey Locrop	3	daughter	—	Illinois
63	Russell Smith	30	head	Painter	Illinois
64	Mildred Smith	23	wife	—	Illinois
65	Franklin Smith	3	son	—	Illinois
66	Roberta Smith	2	daughter	—	Illinois
67	Thomas Smith	0	son	—	Illinois
68	Richard Roelfsema	70	head	—	Holland
69	Henrietta Roelfsema	65	wife	—	Holland
70	John Roelfsema	12	son	—	Illinois
71	Mary Gallagher THIS PERSON	32	head	—	Illinois
72	Joan Gallagher	13	daughter	—	Illinois
73	Daniel Gallagher	11	son	—	Illinois
74	Joseph Stockus	30	head	Salesman	Lithuania
75	Elizabeth Stockus	28	wife	—	Illinois
76	Lucille Uzitas	35	sister-in-law	Packer	Illinois
77	Anna Philip	55	head	—	Illinois
78	Raymon Philip	59	brother	Auto Mechanic	Illinois
79	Fred Philip	46	brother	Painter	Illinois
80	Martha Fach	44	head	—	Russia

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Pedigree Summary

Mary

Gen 1 · 2 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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