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.~1927), then head of a 9-person household.
Age 13
b. ~1927
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Cronin |
| Given Name | John J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Malden city |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | 6 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Malden 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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Katherine Cronin | Spouse | — | 50 | ~1890 |
| Barbara Cronin | Daughter | — | 11 | ~1929 |
| Margaret Cronin | Daughter | — | 9 | ~1931 |
| Mary Cronin | Daughter | — | 16 | ~1924 |
| Clara Cronin | Daughter | — | 12 | ~1928 |
| Catherine Cronin | Daughter | — | 15 | ~1925 |
| John Cronin | Head | — | 54 | ~1886 |
| Patricia Cronin | Daughter | — | 7 | ~1933 |
| John Cronin | Son | — | 13 | ~1927 |
Census Appearances
1930
Middlesex, Massachusetts
Son, age 3
Middlesex, Massachusetts · implied b. ~1927 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cronin |
| Given Name | John J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Son, age 13
Middlesex-County, Massachusetts · implied b. ~1927 — 9 household members
| Surname | Cronin |
| Given Name | John J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Malden city |
| 1935 Residence (County) | Middlesex |
| Income (1939) | 0 |
| Highest Grade | 6 |
| 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 13 · b. ~1927 · Massachusetts
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Sibling
Clara Cronin
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Cronin
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Cronin
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Barbara Cronin
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Cronin
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patricia Cronin
Sibling · 1940 · age 7
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-t0627-01608-00397)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Sammon, Elsie Potter | 50 | Sister-in-law | — | Sweden |
| 2 | Mc Goff, Martha T. Potter | 54 | Lodger | — | Massachusetts |
| 3 | Edmund J. Downs | 51 | Head | Laborer | Kansas |
| 4 | Mary E. Downs | 44 | Wife | — | New Hampshire |
| 5 | Dorothy C. Downs | 17 | Daughter | New Worker | New Hampshire |
| 6 | Fred E. Doucette | 44 | Head | Clerk | Massachusetts |
| 7 | Julia D. Doucette | 43 | Wife | — | Massachusetts |
| 8 | Fred E. Jr. Doucette | 17 | Son | — | Massachusetts |
| 9 | Marilyn Doucette | 15 | Daughter | — | Massachusetts |
| 10 | Mary R. Veraly | 67 | Mother-in-law | — | Massachusetts |
| 11 | William J. Veraly | 30 | Brother-in-law | Special Delivery | Massachusetts |
| 12 | James J. Allen | 63 | Head | — | Rhode Island |
| 13 | Victor B. Allen | 38 | Son | Treasurer | Canada English |
| 14 | Wellends, Sarah | 27 | Sister-in-law | — | Massachusetts |
| 15 | Angus P. Mac Millan | 38 | Head | Heater | Canada English |
| 16 | Kenneth X. Mac Millan | 36 | Wife | — | New Hampshire |
| 17 | George J. Mac Millan | 11 | Son | — | Massachusetts |
| 18 | Walter J. Catillo | 43 | Head | Supervisor Electrician | Massachusetts |
| 19 | Grace M. Catillo | 38 | Wife | — | New York |
| 20 | J. William Catillo | 17 | Son | — | Massachusetts |
| 21 | Charles E. Catillo | 15 | Son | — | Massachusetts |
| 22 | Carl H. Blomuth | 53 | Head | Painter | Massachusetts |
| 23 | Marcella Blomuth | 51 | Wife | — | Massachusetts |
| 24 | Virginia Blomuth | 27 | Daughter | Cashier | New Jersey |
| 25 | Carl Jr. Blomuth | 22 | Son | New Worker | Massachusetts |
| 26 | Edward Blomuth | 20 | Son | New Worker | Massachusetts |
| 27 | Sheldon Blomuth | 17 | Son | — | Massachusetts |
| 28 | Francis Blomuth | 15 | Son | — | Massachusetts |
| 29 | Marcella Blomuth | 8 | Daughter | — | Massachusetts |
| 30 | John S. Cronin | 54 | Head | Laborer | Massachusetts |
| 31 | Katherine V. Cronin | 50 | Wife | — | Rhode Island |
| 32 | Mary E. Cronin | 16 | Daughter | — | Massachusetts |
| 33 | Catherine A. Cronin | 15 | Daughter | — | Massachusetts |
| 34 | John J. Cronin THIS PERSON | 13 | Son | — | Massachusetts |
| 35 | Clara J. Cronin | 12 | Daughter | — | Massachusetts |
| 36 | Barbara Cronin | 11 | Daughter | — | Massachusetts |
| 37 | Margaret Cronin | 9 | Daughter | — | Massachusetts |
| 38 | Patricia Cronin | 7 | Daughter | — | Massachusetts |
| 39 | Thomas J. Donnelly | 32 | Head | Office Clerk | Massachusetts |
| 40 | Ellen M. Donnelly | 30 | Wife | — | Massachusetts |
Related Census Records
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)