JB
John Brennan — 1940 US Census Record
Model Tree available1940 United States Federal Census · San-Francisco-County, California
Our Model Tree links this John Brennan across the 1920, 1930 and 1940 US Censuses in San-Francisco-County, California (XGBoost, ~Confirmed), with identified parents Bridget & Bridget — first a son (b.~1898), then head of a 2-person household.
Age 42
b. ~1898
Male
Son
Born: Nebraska
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | San-Francisco-County, California |
| Surname | Brennan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 42 |
| Marital Status | Single |
| Birthplace | Nebraska |
| 1935 Residence (City) | San Francisco |
| 1935 Residence (County) | San Francisco |
| Additional Details | |
| Occupation | Truck Driver |
| Industry | Municipal |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 2080 |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| Birth State | Nebraska |
| Birth Country | United States |
| Birthplace (normalized) | nebraska |
| Occupation | Truck Driver |
| Township / Ward | San Francisco |
| Est. Birth Year | ~1898 |
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.
2 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Bridget Brennan | Head | — | 77 | ~1863 |
| John Brennan | Son | — | 42 | ~1898 |
Census Appearances
1920
San Francisco, …
Son, age 23
San Francisco, California · implied b. ~1897 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brennan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Nebraska |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Chauffeur |
| Industry | Private |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Nebraska |
| Birth Country | United States |
| Birthplace (normalized) | nebraska |
1930
San Francisco, …
Son, age 32
San Francisco, California · implied b. ~1898 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brennan |
| Given Name | John J. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 32 |
| Marital Status | Single |
| Birthplace | Nebraska |
| Father's Birthplace | Ireland |
| Mother's Birthplace | South Ireland |
| Occupation | Chauffeur |
| Industry | City |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Nebraska |
| Birth Country | United States |
| Birthplace (normalized) | nebraska |
1940
San-Francisco-County, California
Son, age 42
San-Francisco-County, California · implied b. ~1898 — 2 household members
| Surname | Brennan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 42 |
| Marital Status | Single |
| Birthplace | Nebraska |
| 1935 Residence (City) | San Francisco |
| 1935 Residence (County) | San Francisco |
| Occupation | Truck Driver |
| Industry | Municipal |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 2080 |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| Birth State | Nebraska |
| Birth Country | United States |
| Birthplace (normalized) | nebraska |
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. Identified parents: mother Bridget Brennan (~0.92 confidence) and mother Bridget Brennan (~0.92 confidence) and mother Bridget Brennan (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Bridget Brennan
b. ~1863
Source mother
● Household
· direct · ~0.92
Mother
Bridget Brennan
b. ~1865
Source mother
● Household
· direct · ~0.92
Mother
Bridget Brennan
b. ~1868
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Brennan
Son · 1940 · age 42 · b. ~1898 · California
★ 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 — San-Francisco-County, California
Open full size
1940 US Federal Census — San-Francisco-County, California
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00312-00343)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Mary Krukov | 49 | Wife | — | Siberia |
| 2 | Walter Clark | 37 | Nephew | Musician | Russia |
| 3 | George E Greninger | 43 | Head | Office Clerk | California |
| 4 | Martha Greninger | 43 | Wife | Nurse | Connecticut |
| 5 | George E Cruden | 50 | Head | Salesman | California |
| 6 | Gertrude Cruden | 45 | Wife | — | California |
| 7 | Jane Cruden | 24 | Daughter | Secretary | California |
| 8 | John Hession | 35 | Head | Bartender | Irish Free State |
| 9 | Elizabeth Hession | 28 | Wife | — | Irish Free State |
| 10 | John Hession | 13 | Son | — | New York |
| 11 | Joseph Hession | 6 | Son | — | New York |
| 12 | James Hession | 4 | Son | — | California |
| 13 | Noreen Hession | 2 | Daughter | — | California |
| 14 | Mary Hession | 0 | Daughter | — | California |
| 15 | Bridget Brennan | 77 | Head | — | Irish Free State |
| 16 | John Brennan THIS PERSON | 42 | Son | Truck Driver | Nebraska |
| 17 | Dell C Carson | 60 | Head | — | Nebraska |
| 18 | Elizabeth Carson | 55 | Wife | — | Nebraska |
| 19 | Oliver Williams | 39 | Head | Elevator Operator | Hawaii |
| 20 | Ruth Williams | 38 | Wife | — | California |
| 21 | Ronald Williams | 7 | Son | — | California |
| 22 | James J Redmond | 45 | Head | Certified Public Accountant | California |
| 23 | Ruth Redmond | 42 | Wife | — | California |
| 24 | John Redmond | 25 | Son | Attendant | California |
| 25 | James Redmond | 22 | Son | Attendant | California |
| 26 | Martha Redmond | 21 | Daughter | Stenographer | California |
| 27 | Thomas Redmond | 17 | Son | — | California |
| 28 | Dolores Redmond | 11 | Daughter | — | California |
| 29 | Eugene Moore | 17 | Nephew | — | California |
| 30 | Robert H Taylor | 22 | Head | Book-Keeper | California |
| 31 | Dorothy Taylor | 19 | Wife | Clerk | California |
| 32 | Patricia Ann Taylor | 0 | Daughter | — | California |
| 33 | Bert Robinson | 51 | Head | Truck Driver | New York |
| 34 | Ella Robinson | 50 | Wife | Book-Keeper | Illinois |
| 35 | Wallace Robinson | 17 | Son | — | California |
| 36 | Wilber Robinson | 17 | Son | — | California |
| 37 | William Tennant | 28 | Head | Clerk | California |
| 38 | Hilda Tennant | 27 | Wife | — | Oklahoma |
| 39 | Le Roy Tennant | 5 | Son | — | California |
| 40 | Arleen Tennant | 1 | Daughter | — | California |
Pedigree Summary
John
Gen 1 · 3 parents
~0.92
Max depth 4 (1900–1950 window)
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)