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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.~1913), then head of a 9-person household.
Age 27
b. ~1913
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 | 27 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Woburn |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Occupation | Baggage-man |
| Industry | Rail-Road |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 250 |
| Highest Grade | Hs 4-19 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Baggage-Man |
| Township / Ward | Woburn |
| Est. Birth Year | ~1913 |
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 |
|---|---|---|---|---|
| Mary Cronin | Daughter | — | 24 | ~1916 |
| Paul Cronin | Son | — | 23 | ~1917 |
| Jerome Cronin | Son | — | 26 | ~1914 |
| Jeremiah Cronin | Head | — | 64 | ~1876 |
| Elizabeth Cronin | Daughter | — | 21 | ~1919 |
| Julia Cronin | Spouse | — | 57 | ~1883 |
| Agnes Cronin | Daughter | — | 17 | ~1923 |
| John Cronin | Son | — | 27 | ~1913 |
| Robert Cronin | Son | — | 19 | ~1921 |
Census Appearances
1930
Middlesex, Massachusetts
Son, age 17
Middlesex, Massachusetts · implied b. ~1913 — 9 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 | 17 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Occupation | Baggageman |
| Industry | Steam Railroad |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Son, age 27
Middlesex-County, Massachusetts · implied b. ~1913 — 9 household members
| Surname | Cronin |
| Given Name | John J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Woburn |
| 1935 Residence (County) | Middlesex |
| Occupation | Baggage-man |
| Industry | Rail-Road |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 250 |
| Highest Grade | Hs 4-19 |
| 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 27 · b. ~1913 · Massachusetts
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Sibling
Agnes Cronin
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elizabeth Cronin
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Cronin
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Paul Cronin
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Cronin
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jerome Cronin
Sibling · 1940 · age 26
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-t0627-01622-00837)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Gertrude Mcintosh | 58 | Wife | Landlady | England |
| 2 | William D. Mcintosh | 25 | Son | Distillery | Massachusetts |
| 3 | Gertrude M. Mcintosh | 14 | Daughter | Distillery | Massachusetts |
| 4 | Benjamin Krupski | 61 | Head | Tailor | Poland |
| 5 | Agatha Krupski | 57 | Wife | — | Poland |
| 6 | Walter Krupski | 25 | Son | Laborer | Massachusetts |
| 7 | Estelle Krupski | 21 | Daughter | Salesgirl | Massachusetts |
| 8 | Edward Krupski | 19 | Son | Laborer | Massachusetts |
| 9 | James Krupski | 17 | Son | — | Massachusetts |
| 10 | William Krupski | 16 | Son | — | Massachusetts |
| 11 | Manuel G. Marks | 45 | Head | Maintenance Man | Massachusetts |
| 12 | Marie B. Marks | 44 | Wife | — | New York |
| 13 | Martha M. Marks | 18 | Daughter | Salesgirl | Massachusetts |
| 14 | Theodore W. Marks | 16 | Son | — | Massachusetts |
| 15 | Thomas W. Airey | 25 | Head | Car-Inspector | Massachusetts |
| 16 | Martha S. Airey | 25 | Wife | — | Massachusetts |
| 17 | Barbara A. Airey | 2 | Daughter | — | Massachusetts |
| 18 | Martha Airey | 0 | Daughter | — | Massachusetts |
| 19 | Joseph W. Airey | 56 | Head | Foreman | England |
| 20 | Annie Airey | 53 | Wife | — | England |
| 21 | Ruth Airey | 15 | Daughter | — | Massachusetts |
| 22 | Jeremiah Cronin | 64 | Head | — | Free State |
| 23 | Julia A. Cronin | 57 | Wife | — | Free State |
| 24 | John J. Cronin THIS PERSON | 27 | Son | Baggage-Man | Massachusetts |
| 25 | Jerome C. Cronin | 26 | Son | Baggage-Man | Massachusetts |
| 26 | Mary G. Cronin | 24 | Daughter | Substitute Teacher | Massachusetts |
| 27 | Paul E. Cronin | 23 | Son | Assistant Meteorologist | Massachusetts |
| 28 | Elizabeth A. Cronin | 21 | Daughter | Book-Keeper | Massachusetts |
| 29 | Robert W. Cronin | 19 | Son | New Worker | Massachusetts |
| 30 | Agnes J. Cronin | 17 | Daughter | — | Massachusetts |
| 31 | Thomas Airey | 75 | Head | — | England |
| 32 | Florence Captis | 33 | Daughter | — | Massachusetts |
| 33 | James Captis | 39 | Son-in-law | Laborer | Massachusetts |
| 34 | James D. Captis | 7 | Grand-son | — | Massachusetts |
| 35 | Thomas W. Captis | 6 | Grand-son | — | Massachusetts |
| 36 | Marie Swan | 9 | Daughter | — | Massachusetts |
| 37 | Henry Ash | 51 | Head | Carpenter | Massachusetts |
| 38 | Harriet Ash | 50 | Wife | — | Massachusetts |
| 39 | Virginia Ash | 24 | Daughter | Personal Clerk | Massachusetts |
| 40 | Melvin Ash | 23 | Son | Brokerage Clerk | 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)