JF
John Finn — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this John Finn across the 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1927), then head of a 8-person household.
Age 13
b. ~1927
Male
Son
Born: Mass
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Finn |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Mass |
| 1935 Residence (City) | Boston city |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | mass |
| Township / Ward | Boston 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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Patricia Finn | Daughter | — | 9 | ~1931 |
| Patrick Finn | Head | — | 50 | ~1890 |
| Theresa Finn | Spouse | — | 50 | ~1890 |
| Mary Finn | Daughter | — | 17 | ~1923 |
| Alfred Finn | Son | — | 11 | ~1929 |
| John Finn | Son | — | 13 | ~1927 |
| James Finn | Son | — | 16 | ~1924 |
| Thomas Finn | Son | — | 15 | ~1925 |
Census Appearances
1930
Suffolk, Massachusetts
Son, age 4
Suffolk, Massachusetts · implied b. ~1926 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Finn |
| Given Name | John T |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Mass |
| Father's Birthplace | Mass |
| Mother's Birthplace | Nova Scotia |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | mass |
1940
Suffolk-County, Massachusetts
Son, age 13
Suffolk-County, Massachusetts · implied b. ~1927 — 8 household members
| Surname | Finn |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Mass |
| 1935 Residence (City) | Boston city |
| 1935 Residence (County) | Suffolk |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | mass |
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.
Our Model Tree links John Finn across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Finn
Son · 1940 · age 13 · b. ~1927 · Massachusetts
★ You are viewing this record
Sibling
James Finn
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Alfred Finn
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Finn
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patricia Finn
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Finn
Sibling · 1940 · age 15
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
1940 US Federal Census — Suffolk-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01665-00091)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Malcolm Yorke | 53 | Head | Electrical Engineer | Nova Scotia |
| 2 | Lillian Yorke | 57 | Wife | — | Mass |
| 3 | Lillian Yorke | 23 | Daughter | — | Mass |
| 4 | Malcolm Yorke | 17 | Son | — | Mass |
| 5 | Dorothy Yorke | 16 | Daughter | — | Mass |
| 6 | John Mahoney | 39 | Head | Fire Man | Mass |
| 7 | Anne Mahoney | 41 | Wife | — | Mass |
| 8 | Ann C. Mahoney | 15 | Daughter | — | Mass |
| 9 | Patricia Mahoney | 13 | Daughter | — | Mass |
| 10 | Margaret Mahoney | 10 | Daughter | — | Mass |
| 11 | Joan Mahoney | 6 | Daughter | — | Mass |
| 12 | Patrick Finn | 50 | Head | Tel Cable Man | Ireland |
| 13 | Theresa Finn | 50 | Wife | — | Ireland |
| 14 | Mary Finn | 17 | Daughter | — | Mass |
| 15 | James Finn | 16 | Son | — | Mass |
| 16 | Thomas Finn | 15 | Son | — | Mass |
| 17 | John Finn THIS PERSON | 13 | Son | — | Mass |
| 18 | Alfred Finn | 11 | Son | — | Mass |
| 19 | Patricia Finn | 9 | Daughter | — | Mass |
| 20 | John O'Malley | 74 | Head | — | Mass |
| 21 | Helen O'Malley | 72 | Sister | — | Mass |
| 22 | Edward C. Donovan | 48 | Head | Fire Man | Mass |
| 23 | Dorothy M. Donovan | 36 | Wife | — | Mass |
| 24 | Dorothy M. Donovan | 13 | Daughter | — | Mass |
| 25 | Helen Donovan | 8 | Daughter | — | Mass |
| 26 | Marion Donovan | 8 | Daughter | — | Mass |
| 27 | Edward Donovan | 6 | Son | — | Mass |
| 28 | Robert Donovan | 4 | Son | — | Mass |
| 29 | John Donovan | 2 | Son | — | Mass |
| 30 | Ann Duran | 50 | Head | Cleaner | Mass |
| 31 | Anna Duran | 25 | Daughter | Typist Clerk | Mass |
| 32 | Thomas Duran | 19 | Son | Clerk | Mass |
| 33 | Joseph Duran | 18 | Son | New Worker | Mass |
| 34 | Albert Duran | 15 | Son | — | Mass |
| 35 | Ella A. Cassidy | 76 | Mother | — | Mass |
| 36 | Ella M. Cassidy | 51 | Sister | Accountant | Mass |
| 37 | Alice Mylett | 47 | Sister | Packer | Mass |
| 38 | James Mylett | 19 | Nephew | Distributor | Mass |
| 39 | Edward Mylett | 16 | Nephew | — | Mass |
| 40 | Frank Shiner | 56 | Head | Salesman | Mass |
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)