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John Cahill — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Suffolk-County, Massachusetts

Our Model Tree links this John Cahill across the 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1927), then head of a 7-person household.

Age 13 b. ~1927 Male Son Born: Massachusetts Single

1940 Census Record Details

Census Year1940
LocationSuffolk-County, Massachusetts
SurnameCahill
Given NameJohn
Relationship to HeadSon
SexM
Color / RaceWhite
Age13
Marital StatusSingle
BirthplaceMassachusetts
1935 Residence (City)Boston City
1935 Residence (County)Suffolk
Additional Details
Highest GradeYes 5
1935 ResidenceSame Place
Birth StateMassachusetts
Birth CountryUnited States
Birthplace (normalized)massachusetts
Township / WardBoston City
Est. Birth Year~1927

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
Edward Cahill Son — 15 ~1925
Jean Cahill Head — 32 ~1908
William Cahill Son — 8 ~1932
Ann Cahill Daughter — 5 ~1935
John Cahill Son — 13 ~1927
Leroy Cahill Son — 10 ~1930
Joseph Cahill Son — 12 ~1928

Census Appearances

1930
Suffolk, Massachusetts
Son, age 3
Suffolk, Massachusetts · implied b. ~1927 — 6 household members
●  Primary link · ~Confirmed · 2 sources
XGBoost Household
Surname Cahill
Given Name John
Relationship to Head son
Sex M
Color / Race White
Age 3
Marital Status Single
Birthplace Massachusetts
Father's Birthplace Massachusetts
Mother's Birthplace Irish Free State
Occupation none
Birth State Massachusetts
Birth Country United States
Birthplace (normalized) massachusetts
1940
Suffolk-County, Massachusetts
Son, age 13
Suffolk-County, Massachusetts · implied b. ~1927 — 7 household members
Surname Cahill
Given Name John
Relationship to Head Son
Sex M
Color / Race White
Age 13
Marital Status Single
Birthplace Massachusetts
1935 Residence (City) Boston City
1935 Residence (County) Suffolk
Highest Grade Yes 5
1935 Residence Same Place
Birth State Massachusetts
Birth Country United States
Birthplace (normalized) massachusetts

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 13 · b. ~1927 · Massachusetts
★ You are viewing this record
Sibling
Joseph Cahill
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ann Cahill
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Cahill
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Cahill
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Leroy Cahill
Sibling · 1940 · age 10
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 — Suffolk-County, Massachusetts Open full size

Page Contents

39 people indexed on this census page (nara:1940:m-t0627-01659-00600)

Line Name Age Relation Occupation Birthplace
1 Hannah Carey 64 Head Seamstress Eire
2 Johanna Kenefick 77 Head — Eire
4 Ralph Page 34 Head Painter Massachusetts
5 Ida Page 29 Wife — Massachusetts
6 Barbara Page 7 Daughter — Massachusetts
7 George Page 4 Son — Massachusetts
8 Morris Carroll 40 Head Machine Operator Eire
9 Georgina Carroll 33 Wife — Massachusetts
10 Mary Carroll 6 Daughter — Massachusetts
11 Richard Carroll 5 Son — Massachusetts
12 David Carroll 4 Son — Massachusetts
13 James Carroll 2 Son — Massachusetts
14 James Walsh 27 Head Pressman Massachusetts
15 Frances Walsh 22 Wife — Massachusetts
16 Mary Walsh 3 Daughter — Massachusetts
17 Frank Alves 33 Head Machine Operator Spain
18 Ella Alves 30 Wife — Massachusetts
19 Mary Alves 10 Daughter — Massachusetts
20 John Alves 8 Son — Massachusetts
21 Lawrence Noftle 75 Head Laborer Newfoundland
22 Catherine Noftle 43 Wife — Massachusetts
23 Robert Noftle 3 Son — Massachusetts
24 Jean Cahill 32 Head — Eire
25 Edward Cahill 15 Son — Massachusetts
26 John Cahill THIS PERSON 13 Son — Massachusetts
27 Joseph Cahill 12 Son — Massachusetts
28 Leroy Cahill 10 Son — Massachusetts
29 William Cahill 8 Son — Massachusetts
30 Ann Cahill 5 Daughter — Massachusetts
31 Ralph Wilson 41 Head Stockkeeper England
32 Beatrice Wilson 28 Wife — Massachusetts
33 Marjorie Wilson 7 Daughter — Massachusetts
34 Ralph Wilson 5 Son — Massachusetts
35 Phyllis Wilson 5 Daughter — Massachusetts
36 Thelma Wilson 1 Daughter — Massachusetts
37 William Howley 57 Head Painter England
38 Elizabeth Howley 50 Wife — England
39 William Mccartney 38 Son in law Chauffeur Massachusetts
40 Grace Mccartney 28 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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