JC
John Cassidy — 1940 US Census Record
Model Tree available1940 United States Federal Census · San-Francisco-County, California
Our Model Tree links this John Cassidy across the 1920, 1930 and 1940 US Censuses in San-Francisco-County, California (XGBoost, ~Confirmed), with identified parents Anna & Patrick — first a head (b.~1917), then head of a 4-person household.
Age 23
b. ~1917
Male
Head
Born: California
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | San-Francisco-County, California |
| Surname | Cassidy |
| Given Name | John Patrick |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Married |
| Birthplace | California |
| 1935 Residence (City) | San Francisco |
| 1935 Residence (County) | San Francisco |
| Additional Details | |
| Occupation | Police Officer |
| Industry | City Govt. |
| Class of Worker | GW |
| Hours Worked | 44 |
| Income (1939) | 2400 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Occupation | Police Officer |
| Township / Ward | San Francisco |
| Est. Birth Year | ~1917 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Rosemary Cassidy | Daughter | — | 1 | ~1939 |
| John Cassidy | Head | — | 23 | ~1917 |
| John Cassidy | Son | — | ~1940 | |
| Mary Cassidy | Spouse | — | 22 | ~1918 |
Census Appearances
1920
San Francisco, …
Son, age 3
San Francisco, California · implied b. ~1917 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cassidy |
| Given Name | John |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | none |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1930
San Francisco, …
Son, age 13
San Francisco, California · implied b. ~1917 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cassidy |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read/Write | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
San-Francisco-County, California
Head, age 23
San-Francisco-County, California · implied b. ~1917 — 4 household members
| Surname | Cassidy |
| Given Name | John Patrick |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Married |
| Birthplace | California |
| 1935 Residence (City) | San Francisco |
| 1935 Residence (County) | San Francisco |
| Occupation | Police Officer |
| Industry | City Govt. |
| Class of Worker | GW |
| Hours Worked | 44 |
| Income (1939) | 2400 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| 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 John Cassidy across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Anna Cassidy (~0.92 confidence) and father Patrick Cassidy (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Anna Cassidy
b. ~1882
Source mother
● Household
· direct · ~0.92
Father
Patrick Cassidy
b. ~1883
Source father
● Household
· direct · ~0.92
This person
Anchor record
John Cassidy
Head · 1940 · age 23 · b. ~1917 · 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
39 people indexed on this census page (nara:1940:m-t0627-00308-00271)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Frank Aldera | 34 | Head | Cement Worker | Italy |
| 42 | Anna Aldera | 39 | Wife | — | California |
| 43 | Wesley Perasso | 16 | Stepson | — | California |
| 44 | Edmund D. Ampler | 56 | Head | Clerk | California |
| 45 | Frances J. Ampler | 51 | Wife | — | California |
| 46 | Beatrix J. Ampler | 25 | Daughter | Clerk | California |
| 47 | John James Barraghy | 58 | Head | Machinist | California |
| 48 | Alvina Barraghy | 52 | Wife | — | California |
| 49 | Elizabeth Barraghy | 25 | Daughter | Stenographer | California |
| 50 | Mary Robinson | 79 | Head | — | New York |
| 51 | Frances Reed | 24 | Granddaughter | Book Keeper | New York |
| 52 | Margaret Kirk | 55 | Boarder | Forelady | Minnesota |
| 53 | Agnes Reed | 29 | Granddaughter | Secretary | New York |
| 54 | J. Zonches | 56 | Head | Pier | Greece |
| 55 | Julia Zonches | 41 | Wife | — | Greece |
| 56 | Riley Zonches | 24 | Son | Odd Jobs | Utah |
| 57 | Kathy Zonches | 22 | Daughter | Egg Handler | Utah |
| 58 | Thelma Zonches | 20 | Daughter | Usheress | Utah |
| 59 | Jimmy Zonches | 15 | Son | — | Illinois |
| 60 | Ellen Zonches | 13 | Daughter | — | Illinois |
| 61 | Callie Zonches | 11 | Daughter | — | Illinois |
| 62 | Baby (No Name) Zonches | 1 | Son | — | California |
| 63 | Howard H. Hanna | 50 | Head | Misc Chief | Nebraska |
| 64 | Anne Hanna | 48 | Wife | — | Colorado |
| 65 | Edward Hanna | 17 | Son | — | Utah |
| 66 | James Stewart Barney | 45 | Head | Motorman | Nebraska |
| 67 | Grace May Barney | 42 | Wife | — | California |
| 68 | Virginia Marie Barney | 19 | Daughter | Usherette | California |
| 69 | Edna Grace Barney | 7 | Daughter | — | California |
| 70 | Alin Coniglio | 40 | Head | — | California |
| 71 | Charles Coniglio | 22 | Son | Accountant | California |
| 72 | Lorraine Coniglio | 17 | Daughter | — | California |
| 73 | Robert Coniglio | 14 | Son | — | California |
| 74 | John Patrick Cassidy THIS PERSON | 23 | Head | Police Officer | California |
| 75 | Mary Cassidy | 22 | Wife | — | California |
| 76 | Rosemary Cassidy | 1 | Daughter | — | California |
| 77 | John Cassidy | 0 | Son | — | California |
| 78 | Maria Chrobok | 44 | Head | — | Hungary |
| 79 | Pauline Perkins | 30 | Daughter | Saleslady | California |
Pedigree Summary
John
Gen 1 · 2 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)