JC
John Cronin — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this John Cronin across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1870), then head of a 7-person household.
Age 70
b. ~1870
Male
Head
Born: Ireland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Cronin |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 70 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Conductor |
| Industry | Street Railway |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 2400 |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
| Occupation | Conductor |
| Township / Ward | Chicago |
| Est. Birth Year | ~1870 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Mary Powers | Daughter | — | 31 | ~1909 |
| John Cronin | Head | — | 70 | ~1870 |
| Mary Cronin | Spouse | — | 70 | ~1870 |
| Nicholas Powers | Other | — | 36 | ~1904 |
| Richard Powers | Other | — | 10 | ~1930 |
| James Powers | Other | — | 5 | ~1935 |
| Kathleen Powers | Other | — | 8 | ~1932 |
Census Appearances
1920
Cook, Illinois
Head, age 52
Cook, Illinois · implied b. ~1868 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cronin |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 52 |
| Marital Status | Married |
| Birthplace | Ireland |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Illinois |
| Occupation | Policeman |
| Industry | City |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Home Owned/Rented | R |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1930
Cook, Illinois
Head, age 62
Cook, Illinois · implied b. ~1868 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cronin |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 62 |
| Marital Status | Married |
| Birthplace | Ireland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1900 |
| Age at First Marriage | 24 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Policeman |
| Industry | Chicago Police |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 9000 |
| Radio Set | R |
| Veteran | No |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1940
Cook-County, Illinois
Head, age 70
Cook-County, Illinois · implied b. ~1870 — 7 household members
| Surname | Cronin |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 70 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Occupation | Conductor |
| Industry | Street Railway |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 2400 |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
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 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
John Cronin
Head · 1940 · age 70 · b. ~1870 · Illinois
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Cook-County, Illinois
Open full size
1940 US Federal Census — Cook-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00938-00006)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Mary Hooks | 34 | Wife | — | Scotland |
| 2 | William Hooks | 3 | Son | — | Illinois |
| 3 | Clara Hooks | 2 | Daughter | — | Illinois |
| 4 | James Ryan | 78 | Head | — | Eire |
| 5 | Johanna Ryan | 80 | Wife | — | Eire |
| 6 | Margaret Ryan | 44 | Daughter | — | Pennsylvania |
| 7 | Thomas Hughes | 50 | Head | Motorman | England |
| 8 | Mary Hughes | 55 | Wife | — | Ireland |
| 9 | Kathleen Hughes | 21 | Daughter | Operator | Illinois |
| 10 | Helen Hughes | 20 | Daughter | Clerk | Illinois |
| 11 | Thomas Hughes | 17 | Son | — | Illinois |
| 12 | John J. Delaney | 53 | Head | Agent | Eire |
| 13 | Catherine Delaney | 43 | Wife | — | Illinois |
| 14 | John Jr. Delaney | 16 | Son | — | Illinois |
| 15 | Thomas Munker | 62 | Head | — | England |
| 16 | Emma Norris | 46 | Housekeeper | — | Norway |
| 17 | John Cronin THIS PERSON | 70 | Head | Conductor | Ireland |
| 18 | Mary Cronin | 70 | Wife | — | Ireland |
| 19 | Mary Powers | 31 | Daughter | — | Illinois |
| 20 | Nicholas Powers | 36 | Son-in-law | Patrolman | Illinois |
| 21 | Richard Powers | 10 | Grandson | — | Illinois |
| 22 | Kathleen Powers | 8 | Granddaughter | — | Illinois |
| 23 | James Powers | 5 | Grandson | — | Illinois |
| 24 | Charles Hubacek | 52 | Head | Bartender | Bohemia |
| 25 | Rose Hubacek | 44 | Wife | — | Bohemia |
| 26 | Charles Hubacek | 21 | Son | — | Illinois |
| 27 | Antonia Hubacek | 80 | Mother | — | Bohemia |
| 28 | James Dalley | 46 | Head | Salesman | Tennessee |
| 29 | Loretta Dalley | 36 | Wife | — | Illinois |
| 30 | Mary Dalley | 8 | Daughter | — | Illinois |
| 31 | James Jr. Dalley | 5 | Son | — | Illinois |
| 32 | Joseph Chynard | 56 | Head | Lineman | Michigan |
| 33 | Lily Chynard | 53 | Wife | — | Illinois |
| 34 | Harry Benson | 34 | Son | Washer | Illinois |
| 35 | John Walsh | 55 | Head | Inspector | England |
| 36 | Elizabeth Walsh | 58 | Wife | — | England |
| 37 | Martin Walsh | 26 | Son | Salesman | Illinois |
| 38 | Joseph Walsh | 25 | Son | Trimmer | Illinois |
| 39 | Elizabeth Walsh | 22 | Daughter | File Clerk | Illinois |
| 40 | Edward Lawler | 67 | Head | — | Ireland |
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)