JC
John Corcoran — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this John Corcoran across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1882), then head of a 7-person household.
Age 58
b. ~1882
Male
Head
Born: Ireland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Corcoran |
| Given Name | John J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 58 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Naturalization Status | First papers filed |
| Additional Details | |
| Occupation | Police Officer |
| Industry | City of Chicago |
| Class of Worker | GW |
| Hours Worked | 56 |
| Income (1939) | 2280 |
| Highest Grade | 8 |
| 1935 Residence | Same House |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
| Occupation | Police Officer |
| Township / Ward | Chicago |
| Est. Birth Year | ~1882 |
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 |
|---|---|---|---|---|
| James Corcoran | Son | — | 19 | ~1921 |
| Theresa Corcoran | Daughter | — | 7 | ~1933 |
| John Corcoran | Head | — | 58 | ~1882 |
| Delia Corcoran | Spouse | — | 44 | ~1896 |
| Mary Corcoran | Daughter | — | 12 | ~1928 |
| John Corcoran | Son | — | 16 | ~1924 |
| Marcus Corcoran | Son | — | 20 | ~1920 |
Census Appearances
1920
Cook, Illinois
Head, age 38
Cook, Illinois · implied b. ~1882 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Corcoran |
| Given Name | John T |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 38 |
| Marital Status | Married |
| Birthplace | Ireland |
| Year of Immigration | 1903 |
| Naturalization Status | First papers filed |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Laborer |
| Industry | Stock Yards |
| 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 46
Cook, Illinois · implied b. ~1884 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Corcoran |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 46 |
| Marital Status | Married |
| Birthplace | Ireland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1905 |
| Age at First Marriage | 23 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Laborer |
| Industry | Building |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Home Owned/Rented | R |
| Home Value / Rent | 12 |
| Radio Set | R |
| Veteran | No |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1940
Cook-County, Illinois
Head, age 58
Cook-County, Illinois · implied b. ~1882 — 7 household members
| Surname | Corcoran |
| Given Name | John J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 58 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Naturalization Status | First papers filed |
| Occupation | Police Officer |
| Industry | City of Chicago |
| Class of Worker | GW |
| Hours Worked | 56 |
| Income (1939) | 2280 |
| Highest Grade | 8 |
| 1935 Residence | Same House |
| 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 Corcoran 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 Corcoran
Head · 1940 · age 58 · b. ~1882 · 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
38 people indexed on this census page (nara:1940:m-t0627-00958-00884)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Harold E. Larson | 40 | Head | Window Trimmer | Illinois |
| 2 | Frieda E. Larson | 41 | Wife | — | Illinois |
| 3 | Harold E. Jr. Larson | 9 | Son | — | Illinois |
| 4 | Donald E. Larson | 4 | Son | — | Illinois |
| 7 | John M. Doornik | 40 | Head | Trader | Illinois |
| 8 | Eileen M. Doornik | 36 | Wife | — | Minnesota |
| 9 | Marion M. Doornik | 9 | Daughter | — | Illinois |
| 10 | John J. Doornik | 6 | Son | — | Illinois |
| 11 | Marguerite M. Doornik | 3 | Daughter | — | Illinois |
| 12 | Hugh J. Mccullough | 68 | Head | — | Scotland |
| 13 | Mary G. Mccullough | 61 | Wife | — | Illinois |
| 14 | Marion V. Mccullough | 27 | Daughter | Switchboard Operator | Illinois |
| 15 | Margaret S. Mccullough | 24 | Daughter | Stenographer | Illinois |
| 16 | Kathryn Mccullough | 19 | Daughter | — | Illinois |
| 17 | Terrance M. Mcgrath | 54 | Head | Switchman | Illinois |
| 18 | Mary E. Mcgrath | 50 | Wife | — | Illinois |
| 19 | William J. Mcgrath | 16 | Son | — | Illinois |
| 20 | John J. Mcgrath | 14 | Son | — | Illinois |
| 21 | John J. Corcoran THIS PERSON | 58 | Head | Police Officer | Ireland |
| 22 | Delia A. Corcoran | 44 | Wife | — | Ireland |
| 23 | Marcus O. Corcoran | 20 | Son | Bookkeeper | Illinois |
| 24 | James B. Corcoran | 19 | Son | — | Illinois |
| 25 | John J. Jr. Corcoran | 16 | Son | — | Illinois |
| 26 | Mary A. Corcoran | 12 | Daughter | — | Illinois |
| 27 | Theresa Corcoran | 7 | Daughter | — | Illinois |
| 28 | Frank J. Konecny | 56 | Head | Salesman | Czechoslovakia |
| 29 | Emma Konecny | 46 | Wife | — | Illinois |
| 30 | Edward J. Balik | 50 | Brother-in-law | Night Watchman | Illinois |
| 31 | Mildred Balik | 30 | Sister-in-law | Clerical | Illinois |
| 32 | William J. Kelly | 40 | Head | Engineer | Virginia |
| 33 | Elizabeth M. Kelly | 41 | Wife | — | Illinois |
| 34 | Ralph J. Kelly | 22 | Son | — | Illinois |
| 35 | Robert N. Kelly | 17 | Son | — | Illinois |
| 36 | Elizabeth P. Kelly | 16 | Daughter | — | Illinois |
| 37 | Hugh P. Roche | 35 | Brother-in-law | 104 Watchman | Illinois |
| 38 | Mary E. Mccue | 37 | Sister-in-law | 52 Clerical | Illinois |
| 39 | Edward Christopher | 40 | Head | Chemist | Illinois |
| 40 | Hedwig M. Christopher | 38 | Wife | — | Germany |
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)