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Thomas Duffy — 1920 US Census Record
Model Tree available1920 United States Federal Census · San Francisco, California
Our Model Tree links this Thomas Duffy across the 1900, 1910 and 1920 US Censuses in San Francisco, California (XGBoost, ~Confirmed), with identified parents Thomas & Thomas — first a son (b.~1898), then head of a 6-person household.
Age 22
b. ~1898
Male
Son
Born: California
Single
1920 Census Record Details
| Census Year | 1920 |
| Location | San Francisco, California |
| Surname | Duffy |
| Given Name | Thomas B. Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Ireland |
| Mother's Birthplace | California |
| Additional Details | |
| Occupation | Chauffeur |
| Industry | Grocery Company |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Occupation | Chauffeur |
| 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.
6 people recorded at the same address in the 1920 census.
| Name | Relation to head | Relative to Thomas | Age | Birth yr |
|---|---|---|---|---|
| Madeline Duffy | Daughter | — | 18 | ~1902 |
| Catherine Duffy | Spouse | — | 45 | ~1875 |
| Joseph Duffy | Son | — | 20 | ~1900 |
| Bernice Duffy | Daughter | — | 16 | ~1904 |
| Thomas Duffy | Son | — | 22 | ~1898 |
| Thomas Duffy | Head | — | 45 | ~1875 |
Census Appearances
1900
San Francisco, …
Son, age 3
San Francisco, California · implied b. ~1897 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffy |
| Given Name | Thomas B |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | California |
| Birth Month | Aug |
| Birth Year | 1897 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | California |
| Can Read | No |
| Can Write | No |
| Speaks English | No |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1910
San Francisco, …
Son, age 12
San Francisco, California · implied b. ~1898 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffy |
| Given Name | Thomas |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Ireland |
| Mother's Birthplace | California |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | English |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1920
San Francisco, …
Son, age 22
San Francisco, California · implied b. ~1898 — 6 household members
| Surname | Duffy |
| Given Name | Thomas B. Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Ireland |
| Mother's Birthplace | California |
| Occupation | Chauffeur |
| Industry | Grocery Company |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| 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 Thomas Duffy across 3 US Census years (1900, 1910 and 1920) in San Francisco, California, using XGBoost record linkage. Identified parents: father Thomas Duffy (~0.92 confidence) and father Thomas Duffy (~0.92 confidence) and father Thomas Duffy (~0.92 confidence) and mother Catherine Duffy (~0.92 confidence) and mother Katie Duffy (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Thomas Duffy
b. ~1869
Source father
● Household
· direct · ~0.92
Father
Thomas Duffy
b. ~1875
Source father
● Household
· direct · ~0.92
Father
Thomas Duffy
b. ~1870
Source father
● Household
· direct · ~0.92
Mother
Catherine Duffy
b. ~1870
Source mother
● Household
· direct · ~0.92
Mother
Katie Duffy
b. ~1871
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Thomas Duffy
Son · 1920 · age 22 · b. ~1898 · California
★ You are viewing this record
Sibling
Joseph Duffy
Sibling · 1920 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Bernice Duffy
Sibling · 1920 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Madeline Duffy
Sibling · 1920 · age 18
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
1920 US Federal Census — San Francisco, California
Open full size
1920 US Federal Census — San Francisco, California
Page Contents
50 people indexed on this census page (ia:1920:14thcensusofpopu135unit:1160)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Natalie Walter | 24 | Wife | — | California |
| 2 | Dorothy Walter | 6 | Daughter | — | California |
| 3 | John F. Schwinhart | 35 | Head | Accountant | Pennsylvania |
| 4 | Loretta Schwinhart | 27 | Wife | — | California |
| 5 | Jacquita Schwinhart | 10 | Daughter | — | California |
| 6 | Frederick Straier | 30 | Head | Boilermaker | Austria |
| 7 | Hayden Straier | 24 | Wife | — | California |
| 8 | Hayden J. Straier | 7 | Son | — | California |
| 9 | Irene V. Straier | 5 | Daughter | — | California |
| 10 | Marie Treadwell | 38 | Head | — | Nevada |
| 11 | Patricia Treadwell | 10 | Daughter | — | Nevada |
| 12 | Sarah Radcliff | 40 | Lodger | — | Nevada |
| 13 | Mildred Radcliff | 15 | Lodger | — | Ireland |
| 14 | Edwin C. Frase | 23 | Head | Longshoreman | South Dakota |
| 15 | Alice Frase | 18 | Wife | — | Minnesota |
| 16 | Allen M. Clark | 57 | Head | Retail Merchant | Minnesota |
| 17 | Emma Clark | 47 | Wife | — | Ohio |
| 18 | Kate M. Clark | 84 | Mother | — | France |
| 19 | Harry C. Coe | 28 | Head | Laborer | Michigan |
| 20 | Blossom Coe | 26 | Wife | — | New York |
| 21 | Jack H. Coe | 9 | Son | — | Michigan |
| 22 | Ernest Berger | 40 | Head | Foreman | Germany |
| 23 | Dora Berger | 35 | Wife | — | Germany |
| 24 | Edward J. Rosenberger | 31 | Head | Fireman | California |
| 25 | Adele Rosenberger | 26 | Wife | — | California |
| 26 | Adele Rosenberger | 4 | Daughter | — | California |
| 27 | Doris Rosenberger | 4 | Daughter | — | California |
| 28 | Edward G. Rosenberger | 1 | Son | — | California |
| 29 | John J. Shackle | 36 | Head | Plumber | California |
| 30 | Victoria Shackle | 34 | Wife | — | California |
| 31 | John J. Shackle | 2 | Son | — | California |
| 32 | Charles F. Shackle | 77 | Father | — | Germany |
| 33 | Thomas B. Duffy | 45 | Head | Laborer | Ireland |
| 34 | Catherine M. Duffy | 45 | Wife | — | California |
| 35 | Thomas B. Jr. Duffy THIS PERSON | 22 | Son | Chauffeur | California |
| 36 | Joseph P. Duffy | 20 | Son | Truckman | California |
| 37 | Madeline E. Duffy | 18 | Daughter | Bookkeeper | California |
| 38 | Bernice E. Duffy | 16 | Daughter | Typist | California |
| 39 | William Herring | 47 | Head | Longshoreman | Pennsylvania |
| 40 | Emma Herring | 40 | Wife | — | California |
| 41 | John E. Norgren | 56 | Lodger | Sailmaker | Denmark |
| 42 | Peter Valente | 38 | Head | Machinist | Italy |
| 43 | Jessie Valente | 33 | Wife | — | New York |
| 44 | Albert Valente | 5 | Son | — | Connecticut |
| 45 | Alexander Valente | 31 | Brother | — | Italy |
| 46 | Grace Valente | 28 | Sister-in-law | — | New York |
| 47 | Gena Valente | 5 | Niece | — | Connecticut |
| 48 | Margaret Valente | 2 | Niece | — | Connecticut |
| 49 | George Cavanass | 49 | Head | Chauffeur | California |
| 50 | Mary Cavanass | 44 | Wife | — | Italy |
Pedigree Summary
Thomas + 3 siblings
Gen 1 · 5 parents
~0.92
Max depth 4 (1900–1950 window)
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1920 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)