MH
Mary Hennessy — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Wayne-County, Michigan
Our Model Tree links this Mary Hennessy across the 1930 and 1940 US Censuses in Wayne-County, Michigan (XGBoost, ~Confirmed) — first a daughter (b.~1922), then head of a 6-person household.
Age 18
b. ~1922
Female
Daughter
Born: Michigan
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Wayne-County, Michigan |
| Surname | Hennessy |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Michigan |
| 1935 Residence (City) | Detroit City |
| 1935 Residence (County) | Wayne |
| Additional Details | |
| Occupation | New Worker |
| Class of Worker | PW |
| Hours Worked | 12 |
| Income (1939) | 0 |
| Highest Grade | H-4 |
| 1935 Residence | Same house |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
| Occupation | New Worker |
| Township / Ward | Detroit City |
| Est. Birth Year | ~1922 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Lois Hennessy | Daughter | — | 13 | ~1927 |
| Jessie Hennessy | Spouse | — | 41 | ~1899 |
| Mary Hennessy | Daughter | — | 18 | ~1922 |
| Robert Hennessy | Son | — | 15 | ~1925 |
| Erma Hennessy | Daughter | — | 17 | ~1923 |
| Robert Hennessy | Head | — | 41 | ~1899 |
Census Appearances
1930
Wayne, Michigan
Daughter, age 9
Wayne, Michigan · implied b. ~1921 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hennessey |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Michigan |
| Father's Birthplace | Michigan |
| Mother's Birthplace | Canada English |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
1940
Wayne-County, Michigan
Daughter, age 18
Wayne-County, Michigan · implied b. ~1922 — 6 household members
| Surname | Hennessy |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Michigan |
| 1935 Residence (City) | Detroit City |
| 1935 Residence (County) | Wayne |
| Occupation | New Worker |
| Class of Worker | PW |
| Hours Worked | 12 |
| Income (1939) | 0 |
| Highest Grade | H-4 |
| 1935 Residence | Same house |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
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 Hennessy across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Hennessy
Daughter · 1940 · age 18 · b. ~1922 · Michigan
★ You are viewing this record
Sibling
Robert Hennessy
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lois Hennessy
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Erma Hennessy
Sibling · 1940 · age 17
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 — Wayne-County, Michigan
Open full size
1940 US Federal Census — Wayne-County, Michigan
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01864-00941)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Jerome Fields | 5 | Son | — | Michigan |
| 2 | Harriet Fields | 2 | Daughter | — | Michigan |
| 3 | Mack Kriemkiing|Kriemking | 36 | Head | Mechanic | Michigan |
| 4 | Jean Kriemkiing|Kriemking | 28 | Wife | — | Canada |
| 5 | Geraldine Kriemkiing|Kriemking | 8 | Daughter | — | Michigan |
| 6 | Benny Stein | 56 | Head | Salesman | Poland |
| 7 | Grace Stein | 46 | Wife | — | Poland |
| 8 | Sol Stein | 16 | Son | — | Michigan |
| 9 | Miriam Stein | 11 | Daughter | — | Michigan |
| 10 | Ray Mills | 38 | Head | Truck Driver | Penna |
| 11 | Cecil Mills | 34 | Wife | — | New York |
| 12 | Ralph Mills | 16 | Son | — | Michigan |
| 13 | Donald Mills | 9 | Son | — | Michigan |
| 14 | Charles Niddrie | 27 | Head | Truck Driver | Canada |
| 15 | Clare Niddrie | 22 | Wife | — | Michigan |
| 16 | Alice Niddrie | 3 | Daughter | — | Michigan |
| 17 | June Niddrie | 1 | Daughter | — | Michigan |
| 18 | Leo Fanger | 28 | Head | Manager | Michigan |
| 19 | Lilian Fanger | 21 | Wife | — | New York |
| 20 | Carl Fanger | 25 | Brother | Painter | Hungary |
| 21 | Jack Katz | 36 | Head | Salesman | Russia |
| 22 | Mildred Katz | 35 | Wife | — | Russia |
| 23 | Herbert Katz | 10 | Son | — | Michigan |
| 24 | Gerald Katz | 6 | Son | — | Michigan |
| 25 | Jack Schultz | 26 | Head | Proprietor | Michigan |
| 26 | Jean Schultz | 25 | Wife | — | Michigan |
| 27 | Ronald Schultz | 5 | Son | — | Michigan |
| 28 | Ben Kovinsky | 39 | Head | Shipping Clerk | Canada |
| 29 | Jewel Kovinsky | 32 | Wife | — | Michigan |
| 30 | Sallie Kovinsky | 12 | Daughter | — | Michigan |
| 31 | Sidney Kovinsky | 6 | Son | — | Michigan |
| 32 | Irving Rosner | 29 | Head | Collector | Michigan |
| 33 | Ida Rosner | 24 | Wife | — | New York |
| 34 | Carol Rosner | 1 | Daughter | — | Michigan |
| 35 | Robert Hennessy | 41 | Head | Iceman | Michigan |
| 36 | Jessie Hennessy | 41 | Wife | — | Canada |
| 37 | Mary Hennessy THIS PERSON | 18 | Daughter | New Worker | Michigan |
| 38 | Erma Hennessy | 17 | Daughter | — | Michigan |
| 39 | Robert Hennessy | 15 | Son | — | Michigan |
| 40 | Lois Hennessy | 13 | Daughter | — | Michigan |
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)