JC
John Cronin — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this John Cronin across the 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1920), then head of a 9-person household.
Age 20
b. ~1920
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Cronin |
| Given Name | John F. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Occupation | Helper - Truck |
| Industry | Trucking |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 800 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Helper - Truck |
| Township / Ward | Boston City |
| 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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Dorothy Cronin | Daughter | — | 12 | ~1928 |
| Richard Cronin | Son | — | 18 | ~1922 |
| Marguerite Cronin | Daughter | — | 22 | ~1918 |
| Joseph Cronin | Son | — | 7 | ~1933 |
| James Cronin | Son | — | 9 | ~1931 |
| Elizabeth Cronin | Spouse | — | 48 | ~1892 |
| Patrick Cronin | Head | — | 50 | ~1890 |
| Robert Cronin | Son | — | 24 | ~1916 |
| John Cronin | Son | — | 20 | ~1920 |
Census Appearances
1930
Suffolk, Massachusetts
Son, age 10
Suffolk, Massachusetts · implied b. ~1920 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cronin |
| Given Name | John F |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Son, age 20
Suffolk-County, Massachusetts · implied b. ~1920 — 9 household members
| Surname | Cronin |
| Given Name | John F. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Occupation | Helper - Truck |
| Industry | Trucking |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 800 |
| 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 20 · b. ~1920 · Massachusetts
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Sibling
Joseph Cronin
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marguerite Cronin
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dorothy Cronin
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Cronin
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Richard Cronin
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Cronin
Sibling · 1940 · age 24
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-t0627-01668-00636)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Ruth G. Dibbern | 31 | Wife | — | Massachusetts |
| 2 | William W. Dibbern | 12 | Son | — | Massachusetts |
| 3 | Richard A. Dibbern | 8 | Son | — | Massachusetts |
| 4 | Mary E. Mcinnes | 53 | Head | — | Ireland |
| 5 | Kathleen M. Mcinnes | 28 | Daughter | Typist | Massachusetts |
| 6 | John M. Mcinnes | 25 | Son | Orderly | Massachusetts |
| 7 | Melvin A. Mcinnes | 18 | Son | — | Massachusetts |
| 8 | Gordon B. Mcinnes | 17 | Son | — | Massachusetts |
| 9 | John J. Heffernan | 37 | Head | Laborer | Massachusetts |
| 10 | Celia A. Heffernan | 33 | Wife | — | Ireland |
| 11 | John J. Heffernan | 9 | Son | — | Massachusetts |
| 12 | Mary B. Heffernan | 8 | Daughter | — | Massachusetts |
| 13 | Geraldine A. Heffernan | 6 | Daughter | — | Massachusetts |
| 14 | Clair Heffernan | 5 | Daughter | — | Massachusetts |
| 15 | James M. Heffernan | 3 | Son | — | Massachusetts |
| 16 | William M. Harrown | 35 | Head | Machinist | Massachusetts |
| 17 | Harriet E. Harrown | 33 | Wife | — | Massachusetts |
| 18 | Elaine M. Harrown | 14 | Daughter | — | Massachusetts |
| 19 | Constance E. Harrown | 12 | Daughter | — | Massachusetts |
| 20 | Leona M. Harrown | 10 | Daughter | — | Massachusetts |
| 21 | Dorothy M. Harrown | 8 | Daughter | — | Massachusetts |
| 22 | Patrick G. Cronin | 50 | Head | Laborer | Ireland |
| 23 | Elizabeth G. Cronin | 48 | Wife | — | Ireland |
| 24 | Robert T. Cronin | 24 | Son | Clerk - Sales | Massachusetts |
| 25 | Marguerite G. Cronin | 22 | Daughter | Maker | Massachusetts |
| 26 | John F. Cronin THIS PERSON | 20 | Son | Helper - Truck | Massachusetts |
| 27 | Richard J. Cronin | 18 | Son | Clerk, Sales | Massachusetts |
| 28 | Dorothy T. Cronin | 12 | Daughter | — | Massachusetts |
| 29 | James P. Cronin | 9 | Son | — | Massachusetts |
| 30 | Joseph Cronin | 7 | Son | — | Massachusetts |
| 31 | Daniel F. Sullivan | 35 | Head | Printer | Massachusetts |
| 32 | Beatrice H. Sullivan | 29 | Wife | — | Canada-French |
| 33 | James H. Sullivan | 38 | Head | Printer | Massachusetts |
| 34 | Charlotte S. Sullivan | 32 | Wife | — | Canada-French |
| 35 | John F. Sullivan | 11 | Son | — | Massachusetts |
| 36 | Annie J. Sullivan | 65 | Head | — | Canada-French |
| 37 | Grace E. Sullivan | 24 | Daughter | Stenographer | Massachusetts |
| 38 | Charles P. Sullivan | 25 | Son | Clerk - Rate | Massachusetts |
| 39 | Ella Lawres | 57 | Head | Proprietor | Russia |
| 40 | Esther Lawres | 24 | Daughter | Sales Clerk | Russia |
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)