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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 1930 and 1940 US Censuses in Nassau-County, New York (XGBoost, ~Confirmed) — first a son (b.~1920), then head of a 8-person household.

Age 20 b. ~1920 Male Son Born: New York Single

1940 Census Record Details

Census Year1940
LocationNassau-County, New York
SurnameCahill
Given NameJohn
Relationship to HeadSon
SexM
Color / RaceWhite
Age20
Marital StatusSingle
BirthplaceNew York
1935 Residence (City)North Republic
1935 Residence (County)Nassau
Additional Details
OccupationRunner
IndustryTeleg House
Class of WorkerPW
Hours Worked44
Income (1939)572
Highest GradeH 4
1935 ResidenceSame place
Birth StateNew York
Birth CountryUnited States
Birthplace (normalized)new york
OccupationRunner
Township / WardNorth Republic
Est. Birth Year~1920

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.

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

Name Relation to head Relative to John Age Birth yr
Wm Cahill Son — 21 ~1919
Wm Cahill Head — 48 ~1892
John Cahill Son — 20 ~1920
Francis Cahill Son — 11 ~1929
Catherine Cahill Spouse — 47 ~1893
Kevin Cahill Son — 18 ~1922
Margaret Cahill Daughter — 14 ~1926
Joan Cahill Daughter — 16 ~1924

Census Appearances

1930
Nassau, New …
Son, age 11
Nassau, New York · implied b. ~1919 — 4 household members
●  Primary link · ~Confirmed · 2 sources
XGBoost Household
Surname Cahill
Given Name John A.
Relationship to Head Son
Sex M
Color / Race White
Age 11
Marital Status Single
Birthplace New York
Father's Birthplace Irish Free State
Mother's Birthplace New York
Can Read/Write Yes
Birth State New York
Birth Country United States
Birthplace (normalized) new york
1940
Nassau-County, New …
Son, age 20
Nassau-County, New York · implied b. ~1920 — 8 household members
Surname Cahill
Given Name John
Relationship to Head Son
Sex M
Color / Race White
Age 20
Marital Status Single
Birthplace New York
1935 Residence (City) North Republic
1935 Residence (County) Nassau
Occupation Runner
Industry Teleg House
Class of Worker PW
Hours Worked 44
Income (1939) 572
Highest Grade H 4
1935 Residence Same place
Birth State New York
Birth Country United States
Birthplace (normalized) new york

Model Tree

An inferred pedigree reconstructed from census links — up to 4 generations within the 1900–1950 window. Closer generations are built from household co-residence; deeper ones are bridged by following a relative to their own childhood census. Confidence compounds and weakens with each generation.
Linked across censuses
Our Model Tree links John Cahill across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Cahill
Son · 1940 · age 20 · b. ~1920 · New York
★ You are viewing this record
Sibling
Margaret Cahill
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Francis Cahill
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Wm Cahill
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joan Cahill
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Kevin Cahill
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
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-t0627-02689-00560)

Line Name Age Relation Occupation Birthplace
41 Hugo Koch 55 Head Jeweler New York
42 Mary E Koch 51 Wife — New York
43 Miriam Koch 25 Daughter Dictographer New York
44 Henry Banks 37 Head Lineman New Jersey
45 Margaret Banks 30 Wife Tel Operator New York
46 Edwin Heppe 38 Head Plumbing New York
47 Florence Heppe 28 Wife — Conn
48 Arthur Heppe 3 Son — New York
49 Wm Cahill 48 Head Editor Ireland
50 Catherine Cahill 47 Wife — Ireland
51 Wm Cahill 21 Son Runner New York
52 John Cahill THIS PERSON 20 Son Runner New York
53 Kevin Cahill 18 Son — New York
54 Joan Cahill 16 Daughter — New York
55 Margaret Cahill 14 Daughter — New York
56 Francis Cahill 11 Son — New York
57 Chas Wright 36 Head Jr Salesman New York
58 Beatrice Wright 30 Wife — New York
59 Bonnie Wright 5 Daughter — New York
60 Peggy Wright 1 Daughter — New York
61 Andrew Macphail 51 Head Pathe News Scotland
62 Hattie Macphail 46 Wife — Maine
63 Albert Macphail 4 Grandson — New York
64 Joseph Bruegge 44 Head Painter Germany
65 Mary Kay Bruegge 36 Wife — Germany
66 Helen Bruegge 7 Daughter — New York
67 Mary Kay Bruegge 6 Daughter — New York
68 John Ochester 48 Head Foreman New York
69 Catherine Ochester 45 Wife — New York
70 Harold Ochester 12 Son — New York
71 James M Love 37 Head Voucher New York
72 Ethel Love 34 Wife — New York
73 Joan Grant 60 Mother-in-law — New York
74 James Love 6 Son — New York
75 Albert Fisher 38 Head Post Office New York
76 Gladys Fisher 30 Wife Teacher New York
77 Marion Fisher 73 Mother — New York
78 Matthew Farnen 36 Head Accountant New York
79 Dorothy Farnen 25 Wife — New York
80 Laurette Farnen 3 Daughter — 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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