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Margaret Brennan — 1940 US Census Record
Model Tree available1940 United States Federal Census · San-Francisco-County, California
Our Model Tree links this Margaret Brennan across the 1920, 1930 and 1940 US Censuses in San-Francisco-County, California (XGBoost, ~Confirmed), with identified parents Thomas & Thomas — first a daughter (b.~1912), then head of a 3-person household.
Age 28
b. ~1912
Female
Daughter
Born: California
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | San-Francisco-County, California |
| Surname | Brennan |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | San Francisco |
| 1935 Residence (County) | San Francisco |
| Additional Details | |
| Occupation | Teacher |
| Industry | Jr. Jr. College |
| Class of Worker | PW |
| Hours Worked | 21 |
| Income (1939) | 10 |
| Highest Grade | C 4 |
| 1935 Residence | Same house |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Occupation | Teacher |
| Township / Ward | San Francisco |
| Est. Birth Year | ~1912 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Margaret | Age | Birth yr |
|---|---|---|---|---|
| Thomas Brennan | Head | — | 59 | ~1881 |
| Margaret Brennan | Daughter | — | 28 | ~1912 |
| Brennan | Spouse | — | 55 | ~1885 |
Census Appearances
1920
San Francisco, …
Daughter, age 8
San Francisco, California · implied b. ~1912 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brennan |
| Given Name | Margaret |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Nevada |
| Mother's Birthplace | California |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1930
San Francisco, …
Daughter, age 18
San Francisco, California · implied b. ~1912 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brennan |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | California |
| Mother's Birthplace | California |
| Can Read/Write | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
San-Francisco-County, California
Daughter, age 28
San-Francisco-County, California · implied b. ~1912 — 3 household members
| Surname | Brennan |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | San Francisco |
| 1935 Residence (County) | San Francisco |
| Occupation | Teacher |
| Industry | Jr. Jr. College |
| Class of Worker | PW |
| Hours Worked | 21 |
| Income (1939) | 10 |
| Highest Grade | C 4 |
| 1935 Residence | Same house |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
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 Margaret Brennan across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Thomas Brennan (~0.92 confidence) and father Thomas Brennan (~0.92 confidence) and father Thomas Brennan (~0.92 confidence) and mother Brennan (~0.92 confidence) and mother Hannah Brennan (~0.92 confidence) and mother Mae Brennan (~0.92 confidence). The pedigree spans 1 generation with 6 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Thomas Brennan
b. ~1881
Source father
● Household
· direct · ~0.92
Father
Thomas Brennan
b. ~1881
Source father
● Household
· direct · ~0.92
Father
Thomas Brennan
b. ~1883
Source father
● Household
· direct · ~0.92
Mother
Brennan
b. ~1885
Source mother
● Household
· direct · ~0.92
Mother
Hannah Brennan
b. ~1886
Source mother
● Household
· direct · ~0.92
Mother
Mae Brennan
b. ~1888
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Margaret Brennan
Daughter · 1940 · age 28 · b. ~1912 · 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-t0627-00322-00224)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Lincoln Lewis | 26 | Head | Executive | California |
| 42 | Sam Wong | 34 | Lodger | Physiotherapy | China |
| 43 | Bertram R. Stone | 65 | Head | Physician | California |
| 44 | Adelaide Stone | 64 | Wife | — | California |
| 45 | Mildred Trader | 65 | Maid | Housekeeper | Pennsylvania |
| 46 | Henry Mcdowell | 41 | Head | — | Pennsylvania |
| 47 | Cecelia A. Mcdowell | 66 | Wife | — | California |
| 48 | Bessie Mcdowell | 38 | Daughter | Clerical Work | California |
| 49 | Son Waster | None | M | Private Practice | — |
| 50 | Joseph Fillippi | 50 | Head | Machinist | Italy |
| 51 | Marie D. Fillippi | 36 | Wife | — | California |
| 52 | Diane Fillippi | 2 | Daughter | — | California |
| 53 | Lucille Morris | 25 | Daughter | Nurse | California |
| 54 | Edward Mills | 50 | Head | Comptroller | California |
| 55 | Gertrude Mills | 50 | Wife | — | California |
| 56 | Edward Jr. Mills | 24 | Son | Attorney | California |
| 57 | Francis Mills | 24 | Daughter | Secretary | Utah |
| 58 | Herbert Simpers | 52 | Head | Secretary | California |
| 59 | Helen Q. Simpers | 46 | Wife | — | California |
| 60 | Sinclair Trimble | 43 | Head | Owner & Notary | California |
| 61 | Frances R. Trimble | 28 | Wife | — | California |
| 62 | Roland White | 63 | Head | Attorney | California |
| 63 | Minnie White | 53 | Wife | — | California |
| 64 | Roland White | 29 | Son | Attorney | California |
| 65 | Alma White | 22 | Daughter | Clerical Work | California |
| 66 | Maximilian Kalish | 55 | Head | Truck Driver | California |
| 67 | Ida Kalish | 52 | Wife | — | California |
| 68 | George Kalish | 12 | Grandson | — | California |
| 69 | Donna Kalish | 9 | Daughter | — | California |
| 70 | Harry Goldman | 57 | Head | Owner | Poland |
| 71 | Annie Goldman | 52 | Wife | — | Russia |
| 72 | Elfreda Goldman | 24 | Daughter | Saleslady | California |
| 73 | Myrtle Goldman | 22 | Daughter | — | California |
| 74 | Ira Terry | 68 | Head | — | California |
| 75 | Agnes Terry | 39 | Daughter | Secretary | California |
| 76 | Jean Walker | 41 | Maid | Housework | Scotland |
| 77 | Thomas Brennan | 59 | Head | — | California |
| 78 | Nan Brennan | 55 | Wife | — | California |
| 79 | Margaret Brennan THIS PERSON | 28 | Daughter | Teacher | California |
| 80 | Sara O'Neil | 62 | Head | — | California |
Pedigree Summary
Margaret
Gen 1 · 6 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)