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Mary Hennessey — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Hennessey across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a spouse (b.~1880), then head of a 5-person household.
Age 60
b. ~1880
Female
Spouse
Born: Ireland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Hennessey |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 60 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
| Township / Ward | Chicago |
| Est. Birth Year | ~1880 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Eileen Hennessey | Daughter | — | 27 | ~1913 |
| John Hennessey | Son | — | 23 | ~1917 |
| Mary Hennessey | Spouse | — | 60 | ~1880 |
| John Hennessey | Head | — | 66 | ~1874 |
| Martin Hennessey | Son | — | 29 | ~1911 |
Census Appearances
1920
Cook, Illinois
Spouse, age 40
Cook, Illinois · implied b. ~1880 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hennessy |
| Given Name | Margaret |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Ireland |
| Year of Immigration | 1892 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth Country | Ireland |
| Year of Naturalization | 1895 |
| Birthplace (normalized) | ireland |
Spouse, age 50
Cook, Illinois · implied b. ~1880 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hennessy |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 50 |
| Marital Status | Married |
| Birthplace | Ireland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1890 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1940
Cook-County, Illinois
Spouse, age 60
Cook-County, Illinois · implied b. ~1880 — 5 household members
| Surname | Hennessey |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 60 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| 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 Mary Hennessey across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Hennessey
Spouse · 1940 · age 60 · b. ~1880 · 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
40 people indexed on this census page (nara:1940:m-t0627-01022-01012)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Frank Lenahan | 34 | Head | Fireman | Ireland |
| 2 | Agnes Lenahan | 29 | Wife | — | Indiana |
| 3 | Frank Jr. Lenahan | 3 | Son | — | Illinois |
| 4 | Marian Lenahan | 1 | Daughter | — | Illinois |
| 5 | John A. Miller | 44 | Head | — | Illinois |
| 6 | Helen Miller | 38 | Wife | — | Illinois |
| 7 | Irene Miller | 14 | Daughter | — | Illinois |
| 8 | — | None | — | — | — |
| 9 | Angela Kasperi | 69 | Head | — | Illinois |
| 10 | Alphonse Kasperi | 39 | Son | Salesman | Illinois |
| 11 | Marie Kasperi | 33 | Daughter | Saleslady | Illinois |
| 12 | Eleanore Clements | 30 | Daughter | Stenographer | Illinois |
| 13 | Maria Green | 9 | Niece | — | Illinois |
| 14 | Creed Vaughan | 41 | Head | Proofreader | Indiana |
| 15 | Betty Vaughan | 30 | Wife | — | Illinois |
| 16 | Margaret Vaughan | 9 | Daughter | — | Illinois |
| 17 | John Vaughan | 8 | Son | — | Illinois |
| 18 | Robert Vaughan | 4 | Son | — | Illinois |
| 19 | William Knight | 59 | Brother-in-law | Press Operator | Missouri |
| 20 | Lulu Knight | 52 | Sister | — | Missouri |
| 21 | James Downey | 65 | Head | Attendant | Illinois |
| 22 | Theresa Downey | 69 | Sister | — | Illinois |
| 23 | Gordon Downey | 35 | Son | Broker | Illinois |
| 24 | Ida Downey | 30 | Daughter-in-law | — | Iowa |
| 25 | Virginia Downey | 7 | Granddaughter | — | Illinois |
| 26 | John Hennessey | 66 | Head | Guard | England |
| 27 | Mary Hennessey THIS PERSON | 60 | Wife | — | Ireland |
| 28 | Martin Hennessey | 29 | Son | Accountant | Illinois |
| 29 | Eileen Hennessey | 27 | Daughter | — | Illinois |
| 30 | John Jr. Hennessey | 23 | Son | Operator | Illinois |
| 31 | Martin Babagian | 51 | Head | Truck Driver | Turkey |
| 32 | Hazel Babagian | 39 | Wife | — | Turkey |
| 33 | Armen Babagian | 14 | Son | — | Illinois |
| 34 | Irma Babagian | 10 | Daughter | — | Illinois |
| 35 | Edward Buchanan | 55 | Lodger | Repairman | Turkey |
| 36 | Peter Bannonty | 37 | Head | Operator | Austria |
| 37 | Daisy Bannonty | 36 | Wife | Seamstress | Illinois |
| 38 | Peter Jr. Bannonty | 7 | Son | — | Illinois |
| 39 | Gilbert Bannonty | 4 | Son | — | Illinois |
| 40 | Michael Bannonty | 2 | Son | — | Illinois |
Related Census Records
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)