JF
John Farrell — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this John Farrell across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1877), then head of a 4-person household.
Age 63
b. ~1877
Male
Head
Born: Canada
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Farrell |
| Given Name | John J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 63 |
| Marital Status | Married |
| Birthplace | Canada |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Officer |
| Industry | Police Dept |
| Class of Worker | GW |
| Hours Worked | 48 |
| Income (1939) | 2500 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth Country | Canada |
| Birthplace (normalized) | canada |
| Occupation | Officer |
| Township / Ward | Chicago |
| Est. Birth Year | ~1877 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Dickie Farrell | Daughter | — | 23 | ~1917 |
| John Farrell | Head | — | 63 | ~1877 |
| Mary Farrell | Other | — | 12 | ~1928 |
| Bridget Farrell | Spouse | — | 57 | ~1883 |
Census Appearances
1920
Cook, Illinois
Head, age 43
Cook, Illinois · implied b. ~1877 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Farrell |
| Given Name | Joseph |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 43 |
| Marital Status | Married |
| Birthplace | Canada |
| Year of Immigration | 1890 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Canada |
| Mother's Birthplace | Canada |
| Occupation | Policeman |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Home Owned/Rented | O |
| Home Free/Mortgaged | M |
| Birth Country | Canada |
| Year of Naturalization | 1898 |
| Birthplace (normalized) | canada |
1930
Cook, Illinois
Head, age 52
Cook, Illinois · implied b. ~1878 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Farrell |
| Given Name | John J |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 52 |
| Marital Status | Married |
| Birthplace | Canada |
| Naturalization Status | Naturalized |
| Year of Immigration | 1890 |
| Age at First Marriage | 25 |
| Father's Birthplace | Canada |
| Mother's Birthplace | Canada |
| Occupation | Police Officer |
| Industry | City of Chicago |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Home Owned/Rented | O |
| Home Value / Rent | 11000 |
| Radio Set | R |
| Veteran | No |
| Birth Country | Canada |
| Birthplace (normalized) | canada |
1940
Cook-County, Illinois
Head, age 63
Cook-County, Illinois · implied b. ~1877 — 4 household members
| Surname | Farrell |
| Given Name | John J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 63 |
| Marital Status | Married |
| Birthplace | Canada |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Occupation | Officer |
| Industry | Police Dept |
| Class of Worker | GW |
| Hours Worked | 48 |
| Income (1939) | 2500 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth Country | Canada |
| Birthplace (normalized) | canada |
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 Farrell 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 Farrell
Head · 1940 · age 63 · b. ~1877 · Illinois
★ You are viewing this record
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
39 people indexed on this census page (nara:1940:m-t0627-00954-00538)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Emma Harrington | 67 | Wife | — | England |
| 42 | Frank G. Larson | 36 | Head | Salesman | Indiana |
| 43 | Helen Larson | 35 | Wife | — | Illinois |
| 44 | Robert Larson | 11 | Son | — | Illinois |
| 45 | Shirley Larson | 6 | Daughter | — | Illinois |
| 46 | Oscar O'Laughney | 75 | Head | — | Ireland |
| 47 | Kathleen Mcenery | 39 | Daughter | — | Illinois |
| 48 | James Mcenery | 41 | Son-in-law | Conductor | Illinois |
| 49 | Muriel Mcenery | 14 | Granddaughter | — | Illinois |
| 50 | Rose Mcenery | 12 | Granddaughter | — | Illinois |
| 51 | John Precord | 34 | Head | Presser | Illinois |
| 52 | Margaret Precord | 30 | Wife | — | Germany |
| 53 | John Czorneski | 26 | Head | Office Worker | Illinois |
| 54 | Eileen Czorneski | 25 | Wife | Stenographer | Illinois |
| 55 | Oscar Koepp | 24 | Head | Counterman | Wisconsin |
| 56 | Regina Koepp | 23 | Wife | — | Wisconsin |
| 57 | John J. Farrell THIS PERSON | 63 | Head | Officer | Canada |
| 58 | Bridget Farrell | 57 | Wife | — | Illinois |
| 59 | Dickie Mary Farrell | 23 | Daughter | — | Illinois |
| 60 | Mary Ellen Farrell | 12 | Granddaughter | — | Illinois |
| 61 | Thelma Ayneson | 51 | Head | Electrician | Illinois |
| 62 | William Lynch | 52 | Head | Clerk | Eire |
| 63 | Mary Lynch | 51 | Wife | — | Eire |
| 64 | Mary Lynch | 20 | Daughter | New Worker | Illinois |
| 65 | Margaret Lynch | 18 | Daughter | Stenographer | Illinois |
| 66 | William Lynch | 17 | Son | — | Illinois |
| 67 | Jean Lynch | 15 | Daughter | — | Illinois |
| 68 | Thomas Lynch | 4 | Son | — | Illinois |
| 69 | William Stewart | 42 | Head | Switchman | Illinois |
| 70 | Bertha Stewart | 36 | Wife | — | Illinois |
| 71 | Shirley Stewart | 11 | Daughter | — | Illinois |
| 72 | Diane Stewart | 5 | Daughter | — | Illinois |
| 73 | Jean Stewart | 4 | Daughter | — | Illinois |
| 74 | Audrey Stewart | 2 | Daughter | — | Illinois |
| 75 | Emil Wrevert | 41 | Head | Animator | Germany |
| 76 | Bertha Wrevert | 33 | Wife | — | Illinois |
| 77 | Lorraine Wrevert | 11 | Daughter | — | Illinois |
| 78 | Dorothy Wrevert | 8 | Daughter | — | Illinois |
| 79 | Frederick Wrevert | 5 | Son | — | 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)