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John Sheehan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this John Sheehan across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1920), then head of a 8-person household.
Age 20
b. ~1920
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Sheehan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | 38 |
| Industry | Electrical Engineer |
| Class of Worker | Private Co. |
| Highest Grade | Hs 2 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | 38 |
| Township / Ward | Chicago |
| Est. Birth Year | ~1920 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Margaret Sheehan | Daughter | — | 23 | ~1917 |
| Jane Sheehan | Daughter | — | 16 | ~1924 |
| Thomas Sheehan | Head | — | 56 | ~1884 |
| John Sheehan | Son | — | 20 | ~1920 |
| James Sheehan | Son | — | 26 | ~1914 |
| Thomas Sheehan | Son | — | 24 | ~1916 |
| William Sheehan | Son | — | 19 | ~1921 |
| Katherine Sheehan | Spouse | — | 55 | ~1885 |
Census Appearances
1930
Cook, Illinois
Son, age 9
Cook, Illinois · implied b. ~1921 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sheehan |
| Given Name | John D. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 20
Cook-County, Illinois · implied b. ~1920 — 8 household members
| Surname | Sheehan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (County) | Cook |
| Occupation | 38 |
| Industry | Electrical Engineer |
| Class of Worker | Private Co. |
| Highest Grade | Hs 2 |
| 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 Sheehan across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Sheehan
Son · 1940 · age 20 · b. ~1920 · Illinois
★ You are viewing this record
Sibling
Thomas Sheehan
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Sheehan
Sibling · 1940 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jane Sheehan
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Sheehan
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Sheehan
Sibling · 1940 · age 19
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-t0627-00949-00343)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Margaret Heneghan | 30 | Wife | — | Irish Free State |
| 2 | Patrick Heneghan | 2 | Son | — | Illinois |
| 3 | Jane O'Malley | 38 | Head | — | Irish Free State |
| 4 | Mary T. O'Malley | 8 | Daughter | — | Illinois |
| 5 | Austin O'Malley | 5 | Son | — | Illinois |
| 6 | Dennis Clifford | 36 | Head | Clerk | Irish Free State |
| 7 | Deborah Clifford | 34 | Wife | — | Irish Free State |
| 8 | James Clifford | 12 | Son | — | Illinois |
| 9 | Helen Clifford | 11 | Daughter | — | Illinois |
| 10 | Dennis, Jr. Clifford | 2 | Son | — | Illinois |
| 11 | Mary Kirk | 52 | Head | Janitress | Irish Free State |
| 12 | Bernard Kirk | 23 | Son | 27 | Illinois |
| 13 | Joseph O'Neill | 25 | Head | 54 | Illinois |
| 14 | Norma O'Neill | 34 | Wife | — | Wisconsin |
| 15 | Sally O'Neill | 5 | Daughter | — | Illinois |
| 16 | Mary Moore | 73 | Head | — | Irish Free State |
| 17 | Mary M. Moore | 41 | Daughter | 44 | Illinois |
| 18 | Fred Moore | 14 | Grandson | — | Illinois |
| 19 | Dorothy Moore | 13 | Granddaughter | — | Illinois |
| 20 | John Gilmartin | 34 | Head | Laborer | Irish Free State |
| 21 | Bridget Gilmartin | 41 | Wife | — | Irish Free State |
| 22 | John Gilmartin | 5 | Son | — | Illinois |
| 23 | Patrick Gilmartin | 3 | Son | — | Illinois |
| 24 | John Clark | 72 | Head | — | Irish Free State |
| 25 | Nora Clark | 71 | Wife | — | Irish Free State |
| 26 | Stephen Fitzgibbons | 46 | Son-in-law | Pressman | Irish Free State |
| 27 | Mary Fitzgibbons | 45 | Daughter | — | Illinois |
| 28 | Mary Fitzgibbons | 13 | Granddaughter | — | Illinois |
| 29 | Stephen Fitzgibbons | 9 | Grandson | — | Illinois |
| 30 | Norine Fitzgibbons | 7 | Granddaughter | — | Illinois |
| 31 | Thomas Sheehan | 56 | Head | — | Irish Free State |
| 32 | Katherine Sheehan | 55 | Wife | — | Irish Free State |
| 33 | James Sheehan | 26 | Son | 40 | Illinois |
| 34 | Thomas Sheehan | 24 | Son | 40 | Illinois |
| 35 | Margaret Sheehan | 23 | Daughter | 40 | Illinois |
| 36 | John Sheehan THIS PERSON | 20 | Son | 38 | Illinois |
| 37 | William Sheehan | 19 | Son | 60 | Illinois |
| 38 | Jane Sheehan | 16 | Daughter | — | Illinois |
| 39 | Gregory Horan | 41 | Head | 26 | Illinois |
| 40 | Anna Horan | 40 | Wife | — | Irish Free State |
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)