JH
John Hennessey — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this John Hennessey across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1928), then head of a 9-person household.
Age 12
b. ~1928
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Hennessey |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | City of Chicago |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Highest Grade | No 5 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | City Of Chicago |
| Est. Birth Year | ~1928 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Thomas Hennessey | Son | — | 13 | ~1927 |
| John Hennessey | Son | — | 12 | ~1928 |
| Robert Hennessey | Son | — | 16 | ~1924 |
| Betty Hennessey | Daughter | — | 20 | ~1920 |
| Marilyn Hennessey | Daughter | — | 9 | ~1931 |
| Edward Hennessey | Son | — | 14 | ~1926 |
| Mary Hennessey | Spouse | — | 42 | ~1898 |
| John Hennessey | Head | — | 42 | ~1898 |
| Roger Hennessey | Son | — | 17 | ~1923 |
Census Appearances
1930
Cook, Illinois
Son, age 4
Cook, Illinois · implied b. ~1926 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hennessy |
| Given Name | John E. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 12
Cook-County, Illinois · implied b. ~1928 — 9 household members
| Surname | Hennessey |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | City of Chicago |
| 1935 Residence (County) | Cook |
| Highest Grade | No 5 |
| 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 Hennessey across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Hennessey
Son · 1940 · age 12 · b. ~1928 · Illinois
★ You are viewing this record
Sibling
Edward Hennessey
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Hennessey
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Roger Hennessey
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marilyn Hennessey
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Betty Hennessey
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Hennessey
Sibling · 1940 · age 13
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-t0627-00954-00043)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Helen Austick | 27 | Wife | — | Illinois |
| 42 | Joan Austick | 5 | Daughter | — | Illinois |
| 43 | Geraldine Austick | 5 | Daughter | — | Illinois |
| 44 | Dorothy Austick | 1 | Daughter | — | Illinois |
| 45 | Adam Mieczynski | 59 | Head | Porter | Poland |
| 46 | Victoria Mieczynski | 52 | Wife | — | Wisconsin |
| 47 | John Mieczynski | 22 | Son | Pocket Maker | Illinois |
| 48 | Jean Mieczynski | 13 | Daughter | — | Illinois |
| 49 | Bruno Stepka | 31 | Head | Cutting Grinder | Illinois |
| 50 | Lillian Stepka | 30 | Wife | — | Illinois |
| 51 | Bruno Jr. Stepka | 7 | Son | — | Illinois |
| 52 | Ruth Stepka | 6 | Daughter | — | Illinois |
| 53 | Robert Stepka | 4 | Son | — | Illinois |
| 54 | Herman Erickson | 51 | Head | Foreman | Sweden |
| 55 | Esther Erickson | 52 | Wife | — | Canada |
| 56 | Gwendolyn Erickson | 16 | Daughter | — | Illinois |
| 57 | Anna Bestman | 78 | Lodger | — | Pennsylvania |
| 58 | John Hennessey | 42 | Head | Clerk | New York |
| 59 | Mary Hennessey | 42 | Wife | — | Iowa |
| 60 | Betty Hennessey | 20 | Daughter | Maid | Iowa |
| 61 | Roger Hennessey | 17 | Son | Laborer | Illinois |
| 62 | Robert Hennessey | 16 | Son | — | Illinois |
| 63 | Edward Hennessey | 14 | Son | — | Illinois |
| 64 | Thomas Hennessey | 13 | Son | — | Illinois |
| 65 | John Hennessey THIS PERSON | 12 | Son | — | Illinois |
| 66 | Marilyn Hennessey | 9 | Daughter | — | Illinois |
| 67 | Alice Kelps | 49 | Head | Maid | Illinois |
| 68 | Iris Kelps | 26 | Daughter | Operator | Illinois |
| 69 | Gordon Kelps | 13 | Son | — | Illinois |
| 70 | — | None | — | — | — |
| 71 | John West | 39 | Head | Mechanic Helper | Illinois |
| 72 | Martha West | 24 | Wife | — | Illinois |
| 73 | Gerald West | 4 | Son | — | Illinois |
| 74 | Gerald J. West | 2 | Son | — | Illinois |
| 75 | Agnes West | 45 | Head | — | Lithuania |
| 76 | Henry Shembore | 31 | Son-in-law | Riveter | Massachusetts |
| 77 | Edith Shembore | 25 | Daughter | — | Illinois |
| 78 | Dolores Shembore | 4 | Grandchild | — | Illinois |
| 79 | Yngve Johnson | 42 | Head | Laborer | Illinois |
| 80 | Mary Johnson | 39 | Wife | — | 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)