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John Brennan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Wayne-County, Michigan
Our Model Tree links this John Brennan across the 1920, 1930 and 1940 US Censuses in Wayne-County, Michigan (XGBoost, ~Confirmed) — first a head (b.~1891), then head of a 6-person household.
Age 49
b. ~1891
Male
Head
Born: Connecticut
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Wayne-County, Michigan |
| Surname | Brennan |
| Given Name | John J. |
| Relationship to Head | head |
| Sex | M |
| Color / Race | White |
| Age | 49 |
| Marital Status | Married |
| Birthplace | Connecticut |
| 1935 Residence (City) | Detroit |
| 1935 Residence (County) | Wayne |
| Additional Details | |
| Occupation | Electrician |
| Industry | Sub Station Operation |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 314 |
| Highest Grade | C 2 |
| 1935 Residence | Same place |
| Birth State | Connecticut |
| Birth Country | United States |
| Birthplace (normalized) | connecticut |
| Occupation | Electrician |
| Township / Ward | Detroit |
| Est. Birth Year | ~1891 |
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 John | Age | Birth yr |
|---|---|---|---|---|
| John Brennan | Head | — | 49 | ~1891 |
| Francis Brennan | Other | — | 42 | ~1898 |
| Margaret Hayes | Other | — | 53 | ~1887 |
| William Brennan | Son | — | 2 | ~1938 |
| John Brennan | Son | — | 12 | ~1928 |
| Madelyn Brennan | Spouse | — | 34 | ~1906 |
Census Appearances
1920
Wayne, Michigan
Other, age 28
Wayne, Michigan · implied b. ~1892 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brennan |
| Given Name | John |
| Relationship to Head | Lodger |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | Connecticut |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Machinist |
| Industry | Automobile Factory |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth State | Connecticut |
| Birth Country | United States |
| Birthplace (normalized) | connecticut |
1930
Wayne, Michigan
Head, age 39
Wayne, Michigan · implied b. ~1891 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brennan |
| Given Name | John J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 39 |
| Marital Status | Single |
| Birthplace | Connecticut |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Occupation | Electrician |
| Industry | Automobile Factory |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 16000 |
| Radio Set | R |
| Birth State | Connecticut |
| Birth Country | United States |
| Birthplace (normalized) | connecticut |
1940
Wayne-County, Michigan
Head, age 49
Wayne-County, Michigan · implied b. ~1891 — 6 household members
| Surname | Brennan |
| Given Name | John J. |
| Relationship to Head | head |
| Sex | M |
| Color / Race | White |
| Age | 49 |
| Marital Status | Married |
| Birthplace | Connecticut |
| 1935 Residence (City) | Detroit |
| 1935 Residence (County) | Wayne |
| Occupation | Electrician |
| Industry | Sub Station Operation |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 314 |
| Highest Grade | C 2 |
| 1935 Residence | Same place |
| Birth State | Connecticut |
| Birth Country | United States |
| Birthplace (normalized) | connecticut |
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 Brennan across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
John Brennan
Head · 1940 · age 49 · b. ~1891 · Michigan
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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-t0627-01860-00744)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Lakta Crits | 25 | wife | — | Ohio |
| 42 | Elma | 25 | wife | — | Ohio |
| 43 | Anna Randa | 78 | head | — | Vienna |
| 44 | Edward Randa | 47 | son | Car Salesman | Michigan |
| 45 | Robert Randa | 42 | son | Electrician | Michigan |
| 46 | John J. Brennan THIS PERSON | 49 | head | Electrician | Connecticut |
| 47 | Madelyn Brennan | 34 | wife | Stenographer | Michigan |
| 48 | John J. Jr. Brennan | 12 | son | — | Michigan |
| 49 | William E. Brennan | 2 | son | — | Michigan |
| 50 | Francis H. Brennan | 42 | brother | Stock Chaser | Connecticut |
| 51 | Margaret Hayes | 53 | servant | Maid | Ireland |
| 52 | Edw B. Ryan | 50 | head | — | Ohio |
| 53 | Joseph Ryan | 24 | son | Heat Treater | Michigan |
| 54 | Paul F. Ryan | 22 | son | Purchasing Clerk | Michigan |
| 55 | Robert Ryan | 21 | son | Salesman | Michigan |
| 56 | James Ryan | 19 | son | Transcribing Clerk | Michigan |
| 57 | Mary Ryan | 17 | daughter | — | Michigan |
| 58 | Joan Ryan | 13 | daughter | — | Michigan |
| 59 | Martha Ryan | 10 | daughter | — | Michigan |
| 60 | Hans C. Hansen | 50 | lodger | Building Contractor | Denmark |
| 61 | Edward J. Sweeney | 44 | head | Undertaker | Michigan |
| 62 | Annie Sweeney | 33 | wife | File Clerk | Canada English |
| 63 | Mary Ann Sweeney | 8 | daughter | — | Michigan |
| 64 | Herbert Kass | 56 | head | Medical Doctor | Michigan |
| 65 | Gladys B. Kass | 42 | wife | — | Michigan |
| 66 | Grayson Kass | 12 | son | — | Michigan |
| 67 | Janet E. Kass | 5 | daughter | — | Michigan |
| 68 | Virginia Landfair | 19 | maid | Maid | Pennsylvania |
| 69 | William Goulet | 36 | head | Fumigator | New York |
| 70 | Ann Dorothy Goulet | 37 | wife | — | Canada English |
| 71 | Beverly Goulet | 15 | daughter | — | Michigan |
| 72 | Vincent Goulet | 13 | son | — | Michigan |
| 73 | Phyllis Goulet | 9 | daughter | — | Michigan |
| 74 | Fred W. Lawrence | 54 | head | Battalion Chief | Michigan |
| 75 | Berenice Lawrence | 52 | wife | — | Michigan |
| 76 | Willard Taylor | 36 | lodger | Assembly Machinist | Ohio |
| 77 | Elmond Gerondale | 46 | head | Medical Doctor | Michigan |
| 78 | Cecelia Gerondale | 44 | wife | — | Canada English |
| 79 | Norbert Gerondale | 12 | son | — | Michigan |
| 80 | Florence Gerondale | 11 | 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)