MH
Mary Hennessy — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Cook, Illinois
Our Model Tree links this Mary Hennessy across the 1930 and 1940 US Censuses in Cook, Illinois (XGBoost, ~Confirmed) — first a spouse (b.~1881), then head of a 7-person household.
Age 49
b. ~1881
Female
Spouse
Born: Michigan
Married
1930 Census Record Details
| Census Year | 1930 |
| Location | Cook, Illinois |
| Surname | Hennessy |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 49 |
| Marital Status | Married |
| Birthplace | Michigan |
| Age at First Marriage | 26 |
| Father's Birthplace | Michigan |
| Mother's Birthplace | Michigan |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1881 |
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.
7 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| John Hennessy | Son | — | 13 | ~1917 |
| Catherine Hennessy | Daughter | — | 20 | ~1910 |
| Isabel Hennessy | Daughter | — | 7 | ~1923 |
| Robert Hennessy | Head | — | 50 | ~1880 |
| Anna Hennessy | Daughter | — | 15 | ~1915 |
| Mary Hennessy | Spouse | — | 49 | ~1881 |
| Robert Hennessy | Son | — | 19 | ~1911 |
Census Appearances
1930
Cook, Illinois
Spouse, age 49
Cook, Illinois · implied b. ~1881 — 7 household members
| Surname | Hennessy |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 49 |
| Marital Status | Married |
| Birthplace | Michigan |
| Age at First Marriage | 26 |
| Father's Birthplace | Michigan |
| Mother's Birthplace | Michigan |
| Can Read/Write | Yes |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
1940
Cook-County, Illinois
Spouse, age 61
Cook-County, Illinois · implied b. ~1879 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hennessey |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 61 |
| Marital Status | Married |
| Birthplace | Michigan |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| 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
Spouse · 1930 · age 49 · b. ~1881 · Illinois
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1930 US Federal Census — Cook, Illinois
Open full size
1930 US Federal Census — Cook, Illinois
Page Contents
16 people indexed on this census page (ia:1930:illinoiscensus00reel429:0919)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Robert Hennessy | 50 | Head | Insurance Agent | Irish Free State |
| 2 | Mary Hennessy THIS PERSON | 49 | Wife | — | Michigan |
| 3 | Catherine Hennessy | 20 | Daughter | Premium Clerk | Illinois |
| 4 | Robert Hennessy | 19 | Son | Office Boy | Illinois |
| 5 | Anna Hennessy | 15 | Daughter | — | Illinois |
| 6 | John Hennessy | 13 | Son | — | Illinois |
| 7 | Isabel Hennessy | 7 | Daughter | — | Illinois |
| 8 | Walter E Boyter | 40 | Head | Clerical | Illinois |
| 9 | Margaret Boyter | 40 | Wife | — | Indiana |
| 10 | Walter Boyter | 14 | Son | — | Illinois |
| 11 | Betty J Boyter | 9 | Daughter | — | Illinois |
| 12 | Joan Boyter | 4 | Daughter | — | Illinois |
| 13 | Isabel (A) Boyter | 72 | Mother | — | Scotland |
| 14 | Helen Hanrahan | 32 | Sister in Law | Waitress | Illinois |
| 15 | Robert Hanrahan | 9 | Nephew | — | Illinois |
| 16 | John E Hanrahan | 8 | Nephew | — | Illinois |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)