JC
John Corcoran — 1940 US Census Record
Model Tree available1940 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), with identified parents Mary — first a son (b.~1916), then head of a 3-person household.
Age 24
b. ~1916
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Corcoran |
| Given Name | John F. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago city |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | wholesale salesman |
| Industry | FOOD |
| Class of Worker | PW |
| Hours Worked | 8 |
| Income (1939) | 400 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Wholesale Salesman |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1916 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Mary Corcoran | Head | — | 54 | ~1886 |
| Mary Corcoran | Daughter | — | 25 | ~1915 |
| John Corcoran | Son | — | 24 | ~1916 |
Census Appearances
1920
Cook, Illinois
Other, age 4
Cook, Illinois · implied b. ~1916 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Corcoran |
| Given Name | John J |
| Relationship to Head | Grandson |
| Sex | M |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | none |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Other, age 14
Cook, Illinois · implied b. ~1916 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Corcoran |
| Given Name | John |
| Relationship to Head | Nephew |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 24
Cook-County, Illinois · implied b. ~1916 — 3 household members
| Surname | Corcoran |
| Given Name | John F. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago city |
| 1935 Residence (County) | Cook |
| Occupation | wholesale salesman |
| Industry | FOOD |
| Class of Worker | PW |
| Hours Worked | 8 |
| Income (1939) | 400 |
| 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 Corcoran across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Mary Corcoran (~0.92 confidence). The pedigree spans 1 generation with 1 identified ancestor.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Mary Corcoran
b. ~1886
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Corcoran
Son · 1940 · age 24 · b. ~1916 · Illinois
★ You are viewing this record
Sibling
Mary Corcoran
Sibling · 1940 · age 25
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 — 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-t0627-00934-00705)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Ruth Shrader | 32 | Lodger | Typing | Colorado |
| 2 | Alexander Venson | 30 | Head | Salesman | Illinois |
| 3 | Adeline Venson | 25 | Wife | Secretary | Illinois |
| 4 | Glen D. Roeske | 35 | Head | Salesman | Illinois |
| 5 | Arthur Pinis | 27 | Head | Salesman | Illinois |
| 6 | Bertie Pinis | 24 | Wife | Nurse | Illinois |
| 7 | Louise Hilday | 45 | Head | Typing | Illinois |
| 8 | Burrett Gravel | 34 | Head | Wholesale Salesman | Missouri |
| 9 | Dorothy Gravel | 31 | Wife | Typing | Illinois |
| 10 | Andrew Bulger | 50 | Head | Time Clerk | New York |
| 11 | Katherine Bulger | 52 | Sister | School Teacher | New York |
| 12 | Elizabeth Bonar | 35 | Head | Typing | Illinois |
| 13 | Roscoe Morrison | 45 | Head | Lawyer | Indiana |
| 14 | Bertha Pim | 55 | Head | Credit Manager | Canada |
| 15 | Eileen O'Connor | 34 | Head | Typing Clerk | Illinois |
| 16 | Calista O'Connor | 60 | Mother | Retail Saleswoman | Iowa |
| 17 | Chas. Mccarthy | 41 | Head | Real Estate | Illinois |
| 18 | Eleanor E. Jacobs | 40 | Head | P.B.X. Operator | Illinois |
| 19 | Harold Moreland | 39 | Head | Retail Salesman | Illinois |
| 20 | Margaret Moreland | 35 | Wife | Retail Saleswoman | Missouri |
| 21 | Dorothy Barra | 32 | Head | Stenographer | Kansas |
| 22 | Marjorie Andreason | 35 | Head | Typing | Illinois |
| 23 | Mary Corcoran | 54 | Head | Secretary | Illinois |
| 24 | John F. Corcoran THIS PERSON | 24 | Son | Wholesale Salesman | Illinois |
| 25 | Mary Corcoran | 25 | Daughter | Retail Saleslady | Illinois |
| 26 | Clara Mcadams | 47 | Head | — | Illinois |
| 27 | Betty Mcadams | 23 | Daughter | Retail Saleslady | Nebraska |
| 28 | Harry Humbert | 44 | Head | Janitor | Illinois |
| 29 | Daniel Weinhall | 41 | Head | Wholesale Salesman | Illinois |
| 30 | Lenore Weinhall | 31 | Wife | — | Illinois |
| 31 | Marie Woser | 35 | Head | Typing | Kansas |
| 32 | Boyd Knell | 46 | Head | Salesman | Minnesota |
| 33 | Jessie Knell | 50 | Wife | — | Illinois |
| 34 | John H. Creighton | 44 | Head | Tavern Owner | Illinois |
| 35 | James Moriarty | 61 | Head | Asst. Manager | Minnesota |
| 36 | Edna Moriarty | 51 | Wife | — | Indiana |
| 37 | Eugene Moriarty | 21 | Son | — | Illinois |
| 38 | Esther Evers | 34 | Head | Secretary | Illinois |
| 39 | Mae E. Burach | 22 | Lodger | Secretary | Illinois |
| 40 | Bertha Lang | 43 | Head | Typing Clerk | Illinois |
Pedigree Summary
John + 1 sibling
Gen 1 · 1 parents
~0.92
Max depth 4 (1900–1950 window)
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)