JC
John Cronin — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this John Cronin across the 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1922), then head of a 9-person household.
Age 18
b. ~1922
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Cronin |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | City of Cambridge |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | City Of Cambridge |
| Est. Birth Year | ~1922 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Anna Cronin | Daughter | — | 16 | ~1924 |
| Mary Cronin | Daughter | — | 21 | ~1919 |
| Nora Cronin | Daughter | — | 20 | ~1920 |
| James Cronin | Son | — | 19 | ~1921 |
| James Cronin | Head | — | 56 | ~1884 |
| Helen Cronin | Daughter | — | 18 | ~1922 |
| Bridget Cronin | Spouse | — | 54 | ~1886 |
| John Cronin | Son | — | 18 | ~1922 |
| Thomas Cronin | Son | — | 17 | ~1923 |
Census Appearances
1930
Middlesex, Massachusetts
Son, age 8
Middlesex, Massachusetts · implied b. ~1922 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cronin |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Occupation | none |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Son, age 18
Middlesex-County, Massachusetts · implied b. ~1922 — 9 household members
| Surname | Cronin |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | City of Cambridge |
| 1935 Residence (County) | Middlesex |
| Highest Grade | H 4 |
| 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.
Our Model Tree links John Cronin across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Cronin
Son · 1940 · age 18 · b. ~1922 · Massachusetts
★ You are viewing this record
Sibling
Anna Cronin
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Cronin
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Cronin
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Cronin
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Nora Cronin
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Cronin
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 — Middlesex-County, Massachusetts
Open full size
1940 US Federal Census — Middlesex-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01685-00442)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Richard Daw | 53 | Head | Retail Salesman | Massachusetts |
| 42 | Elizabeth Daw | 52 | Wife | — | Maine |
| 43 | Ellen Daw | 18 | Daughter | Cashier | Massachusetts |
| 44 | Richard Rablin | 37 | Head | Reports Assistant | Massachusetts |
| 45 | Jessie Rablin | 34 | Wife | — | Massachusetts |
| 46 | Joan Rablin | 7 | Daughter | — | Massachusetts |
| 47 | Robert Walsh | 40 | Head | — | Maine |
| 48 | Amy Walsh | 42 | Wife | Musician | Nova Scotia |
| 49 | Mary E Walsh | 75 | Mother | — | Quebec |
| 50 | Laleah Mower | 46 | Sister | Secretary | Maine |
| 51 | Dorothey Mower | 18 | Niece | — | Massachusetts |
| 52 | Timothy A Fuller | 61 | Head | Clerk | Maine |
| 53 | Ivy Lovering | 45 | Sister | — | Massachusetts |
| 54 | Arnold Lovering | 26 | Nephew | — | Massachusetts |
| 55 | Stasia Lovering | 25 | Niece in law | Waitress | Massachusetts |
| 56 | David Lovering | 3 | Nephew in law | — | Massachusetts |
| 57 | Ellen Mcguire | 52 | Head | — | Massachusetts |
| 58 | Catherine Mcconologue | 65 | Head | — | Eire |
| 59 | Kurt Schweitzer | 53 | Lodger | Bookkeeper | Germany |
| 60 | Florence S Patterson | 27 | Lodger | — | Canada-English |
| 61 | Clifton Furness | 41 | Head | Instructor | Indiana |
| 62 | Clara Furness | 65 | Mother | — | Indiana |
| 63 | Frederick F Clauss | 61 | Head | Court Officer | Massachusetts |
| 64 | Fanny Clauss | 57 | Wife | — | Massachusetts |
| 65 | Charles Clauss | 34 | Son | Salesman | Massachusetts |
| 66 | Edward Lively | 23 | Lodger | Chemist | Pennsylvania |
| 67 | Charles C Hansen | 69 | Head | Teacher | New Hampshire |
| 68 | Bertha Hansen | 63 | Wife | — | Massachusetts |
| 69 | Helen Hansen | 30 | Daughter | — | Massachusetts |
| 70 | Charles L Jr Hansen | 22 | Son | — | Massachusetts |
| 71 | Lincoln F Hansen | 19 | Son | — | Massachusetts |
| 72 | James Cronin | 56 | Head | Restaurant Manager | Eire |
| 73 | Bridget Cronin | 54 | Wife | — | Eire |
| 74 | Mary Cronin | 21 | Daughter | Librarian | Massachusetts |
| 75 | Nora Cronin | 20 | Daughter | Secretary | Massachusetts |
| 76 | James Cronin | 19 | Son | — | Massachusetts |
| 77 | John Cronin THIS PERSON | 18 | Son | — | Massachusetts |
| 78 | Helen Cronin | 18 | Daughter | — | Massachusetts |
| 79 | Thomas Cronin | 17 | Son | — | Massachusetts |
| 80 | Anna Cronin | 16 | Daughter | — | Massachusetts |
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)