John Cahill — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Nassau-County, New York

Our Model Tree links this John Cahill across the 1920, 1930 and 1940 US Censuses in Nassau-County, New York (XGBoost, ~Confirmed) — first a head (b.~1895), then head of a 7-person household.

Age 45 b. ~1895 Male Head Born: Ireland Married

1940 Census Record Details

Census Year	1940
Location	Nassau-County, New York
Surname	Cahill
Given Name	John
Relationship to Head	Head
Sex	M
Color / Race	White
Age	45
Marital Status	Married
Birthplace	Ireland
1935 Residence (City)	Valley Stream
1935 Residence (County)	Nassau
Naturalization Status	Naturalized
Additional Details
Occupation	Manager
Industry	Restaurant
Class of Worker	PW
Hours Worked	39
Income (1939)	5000
Highest Grade	C 4
1935 Residence	Same place
Birth Country	Ireland
Birthplace (normalized)	ireland
Occupation	Manager
Township / Ward	Valley Stream
Est. Birth Year	~1895

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.

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

Name	Relation to head	Relative to John	Age	Birth yr
Francis Cahill	Son	—	11	~1929
Walter Cahill	Other	—	45	~1895
James Cahill	Son	—	16	~1924
Georgian Cahill	Daughter	—	18	~1922
John Cahill	Head	—	45	~1895
Katherine Cahill	Daughter	—	22	~1918
Marie Cahill	Spouse	—	45	~1895

Census Appearances

1920

New York, …

Other, age 22

New York, New York · implied b. ~1898 — 7 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Cahill
Given Name	John
Relationship to Head	servant
Sex	M
Color / Race	White
Age	22
Marital Status	Single
Birthplace	Ireland
Year of Immigration	1914
Naturalization Status	Alien
Father's Birthplace	Ireland
Mother's Birthplace	Ireland
Occupation	Butler
Industry	private family
Class of Worker	W
Can Read	Yes
Can Write	Yes
Speaks English	Yes
Mother Tongue	English
Birth Country	Ireland
Birthplace (normalized)	ireland

1930

New York, …

Other, age 34

New York, New York · implied b. ~1896 — 50 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Cahill
Given Name	John
Relationship to Head	Roomer
Sex	M
Color / Race	White
Age	34
Marital Status	Single
Birthplace	Ireland
Naturalization Status	Alien
Year of Immigration	1904
Father's Birthplace	Ireland
Mother's Birthplace	Ireland
Occupation	Waiter
Industry	Restaurant
Class of Worker	W
Can Read/Write	Yes
Mother Tongue	English
Veteran	No
Birth Country	Ireland
Birthplace (normalized)	ireland

1940

Nassau-County, New …

Head, age 45

Nassau-County, New York · implied b. ~1895 — 7 household members

Surname	Cahill
Given Name	John
Relationship to Head	Head
Sex	M
Color / Race	White
Age	45
Marital Status	Married
Birthplace	Ireland
1935 Residence (City)	Valley Stream
1935 Residence (County)	Nassau
Naturalization Status	Naturalized
Occupation	Manager
Industry	Restaurant
Class of Worker	PW
Hours Worked	39
Income (1939)	5000
Highest Grade	C 4
1935 Residence	Same place
Birth Country	Ireland
Birthplace (normalized)	ireland

Model Tree

Linked across censuses

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

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This person

Anchor record

John Cahill

Head · 1940 · age 45 · b. ~1895 · New York

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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 — Nassau-County, New York Open full size

Page Contents

40 people indexed on this census page (nara:1940:m-t0627-02687-00362)

Line	Name	Age	Relation	Occupation	Birthplace
41	Jean Jameson	21	Daughter	Clerk	New York
42	Miriam Jameson	19	Daughter	—	New York
43	Harry Jameson	16	Son	—	New York
44	Anne Jameson	14	Daughter	—	New York
45	Thomas A. Groom	52	Head	Supervisor	New Jersey
46	Laura F. Groom	54	Wife	—	New Jersey
47	Sarah J. Groom	20	Daughter	Office Assistant	New Jersey
48	Eva Erbe	52	Head	Securities	New York
49	Elwood Erbe	29	Son	Laborer	New York
50	Doris Erbe	25	Daughter	Stenographer	New York
51	Donald Erbe	21	Son	Farmer	New York
52	Dorothy Erbe	21	Wife	—	New York
53	Dorothy Ann Erbe	1	Granddaughter	—	New York
54	Harvey Ellen Erbe	1	Granddaughter	—	New York
55	Clayton Erbe	17	Son	—	New York
56	Warren Erbe	16	Son	—	New York
57	Irving Firstenberg	32	Head	Laborer	New York
58	Frieda Firstenberg	34	Wife	—	New York
59	Barbara Audrey Firstenberg	3	Daughter	—	New York
60	Florence Smith	58	Head	—	New York
61	Sophie Brandis	65	Sister	—	New York
62	John Cahill THIS PERSON	45	Head	Manager	Ireland
63	Marie Cahill	45	Wife	—	Ireland
64	Katherine Cahill	22	Daughter	Stenographer	New York
65	Georgian Cahill	18	Daughter	New Worker	New York
66	James Cahill	16	Son	—	New York
67	Francis Cahill	11	Son	—	New York
68	Walter Cahill	45	Brother	Salesman	Ireland
69	Frederick Bertsch	41	Head	Engineer	New York
70	Frieda Bertsch	47	Wife	—	Germany
71	Frederick Bertsch	7	Son	—	New York
72	Benjamin Thorne	63	Head	Yard Master	New York
73	Rose Thorne	57	Wife	—	Germany
74	Peter Mcgrath	34	Son-in-law	Helper	Canada English
75	Cornelia Mcgrath	26	Daughter	—	New York
76	Donald Mcgrath	6	Grandson	—	New York
77	Philip Datz	33	Head	Fruit Salesman	New York
78	Philip Datz	8	Son	—	New York
79	John Datz	4	Son	—	New York
80	Mary Datz	59	Mother	—	New York

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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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