JC
John Carroll — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this John Carroll across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1898), then head of a 6-person household.
Age 42
b. ~1898
Male
Head
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Carroll |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 42 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Deputy County Clerk |
| Industry | Cook County |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 2100 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Deputy County Clerk |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1898 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Geraldine Carroll | Daughter | — | 15 | ~1925 |
| Shirley Carroll | Daughter | — | 16 | ~1924 |
| John Carroll | Head | — | 42 | ~1898 |
| Daniel Carroll | Son | — | 12 | ~1928 |
| John Carroll | Son | — | 21 | ~1919 |
| Emilie Carroll | Spouse | — | 39 | ~1901 |
Census Appearances
1920
Cook, Illinois
Other, age 19
Cook, Illinois · implied b. ~1901 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Carroll |
| Given Name | John |
| Relationship to Head | Roomer |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | Operator |
| Industry | Electric Co. |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Head, age 31
Cook, Illinois · implied b. ~1899 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Carroll |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | Illinois |
| Age at First Marriage | 21 |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | Driver |
| Industry | Milk Co. |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Head, age 42
Cook-County, Illinois · implied b. ~1898 — 6 household members
| Surname | Carroll |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 42 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | Deputy County Clerk |
| Industry | Cook County |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 2100 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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 Carroll 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 Carroll
Head · 1940 · age 42 · b. ~1898 · 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-t0627-00992-00594)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Cyril Lillie | 36 | Head | Machinist | Illinois |
| 2 | Laura Lillie | 72 | Mother | — | England |
| 3 | Berenice Booma | 32 | Sister | Secretary | Illinois |
| 4 | Genevieve Mc Laughlin | 45 | Head | — | Illinois |
| 5 | Thomas Mc Laughlin | 25 | Son | Radio Mechanic | Illinois |
| 6 | Genevieve Lincoln | 26 | Daughter | Waitress | Illinois |
| 7 | Duane Francis | 7 | Son | — | Illinois |
| 8 | James Maguire | 29 | Lodger | Fireman | Illinois |
| 9 | Peter Wiggen | 65 | Head | Mechanical Engineer | Norway |
| 10 | Anna Wiggen | 51 | Wife | — | Wisconsin |
| 11 | Bernard Kehle | 28 | Head | Apprentice Tool & Die | Illinois |
| 12 | Eleanor Kehle | 27 | Wife | Mail Order Clerk | Illinois |
| 13 | William R. Plano | 28 | Head | Printer | Illinois |
| 14 | Dorothy Plano | 27 | Wife | — | Illinois |
| 15 | John F. Plano | 0 | Son | — | Illinois |
| 16 | Robert Celestino | 33 | Head | Co-Ordinator | Italy |
| 17 | Martha Celestino | 25 | Wife | Clerk & Secretary | Indiana |
| 18 | Lawrence J. King | 25 | Head | Traveling Salesman | Connecticut |
| 19 | Alice King | 24 | Wife | — | Connecticut |
| 20 | Shirley King | 14 | Daughter | — | Connecticut |
| 21 | Jean King | 13 | Daughter | — | Connecticut |
| 22 | Robert King | 9 | Son | — | Illinois |
| 23 | Joyce King | 7 | Daughter | — | Illinois |
| 24 | Nick Maros | 62 | Head | Baker | Greece |
| 25 | Mary Maros | 50 | Wife | — | Greece |
| 26 | James Maros | 32 | Son | Manager | Greece |
| 27 | Olaf Tollefsen | 31 | Head | Insurance Clerk | Illinois |
| 28 | Dorothy Tollefsen | 27 | Wife | — | Illinois |
| 29 | Carol Tollefsen | 4 | Daughter | — | Illinois |
| 30 | Richard Tollefsen | 1 | Son | — | Illinois |
| 31 | Frank Schlegel | 47 | Head | Chauffeur | Austria |
| 32 | Theresa Schlegel | 45 | Wife | — | Austria |
| 33 | Robert Schlegel | 12 | Son | — | Illinois |
| 34 | John Carroll THIS PERSON | 42 | Head | Deputy County Clerk | Illinois |
| 35 | Emilie Carroll | 39 | Wife | — | Illinois |
| 36 | John Jr. Carroll | 21 | Son | Stock Keeper | Illinois |
| 37 | Geraldine Carroll | 15 | Daughter | Stenographer | Illinois |
| 38 | Shirley Carroll | 16 | Daughter | — | Illinois |
| 39 | Daniel Carroll | 12 | Son | — | Illinois |
| 40 | Frank Peters | 57 | Head | Proprietor | Illinois |
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)