JC
John Cahill — 1940 US Census Record
Model Tree available1940 United States Federal Census · Bronx-County, New York
Our Model Tree links this John Cahill across the 1920, 1930 and 1940 US Censuses in Bronx-County, New York (XGBoost, ~Confirmed), with identified parents Edward & Edward — first a head (b.~1908), then head of a 7-person household.
Age 32
b. ~1908
Male
Head
Born: New York
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Bronx-County, New York |
| Surname | Cahill |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 32 |
| Marital Status | Married |
| Birthplace | New York |
| 1935 Residence (City) | New York City |
| 1935 Residence (County) | Bronx |
| Additional Details | |
| Occupation | Doctor |
| Industry | Own Practice |
| Class of Worker | OA |
| Hours Worked | 48 |
| Highest Grade | C 5 |
| 1935 Residence | Same Place |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
| Occupation | Doctor |
| Township / Ward | New York City |
| Est. Birth Year | ~1908 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Cahill | Son | — | 5 | ~1935 |
| Kevin Cahill | Son | — | 3 | ~1937 |
| Gerald Cahill | Son | — | 1 | ~1939 |
| John Cahill | Head | — | 32 | ~1908 |
| Genevieve Cahill | Spouse | — | 32 | ~1908 |
| Michael Cahill | Son | — | 2 | ~1938 |
| Mary Napolitano | Other | — | 24 | ~1916 |
Census Appearances
1920
Bronx, New …
Son, age 11
Bronx, New York · implied b. ~1909 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cahill |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | New York |
| Mother's Birthplace | New York |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1930
Bronx, New …
Son, age 21
Bronx, New York · implied b. ~1909 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cahill |
| Given Name | John E. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | New York |
| Mother's Birthplace | New York |
| Occupation | Electrician |
| Industry | Electric Light |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1940
Bronx-County, New …
Head, age 32
Bronx-County, New York · implied b. ~1908 — 7 household members
| Surname | Cahill |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 32 |
| Marital Status | Married |
| Birthplace | New York |
| 1935 Residence (City) | New York City |
| 1935 Residence (County) | Bronx |
| Occupation | Doctor |
| Industry | Own Practice |
| Class of Worker | OA |
| Hours Worked | 48 |
| Highest Grade | C 5 |
| 1935 Residence | Same Place |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
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 Cahill across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Edward Cahill (~0.92 confidence) and father Edward Cahill (~0.92 confidence) and mother Alice Cahill (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Edward Cahill
b. ~1880
Source father
● Household
· direct · ~0.92
Father
Edward Cahill
b. ~1880
Source father
● Household
· direct · ~0.92
Mother
Alice Cahill
b. ~1882
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Cahill
Head · 1940 · age 32 · b. ~1908 · New York
★ 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 — Bronx-County, New York
Open full size
1940 US Federal Census — Bronx-County, New York
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02478-00843)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Doris Price | 37 | Wife | — | Maine |
| 42 | Charles Mace | 60 | Head | Chemical Eng. | Mass. |
| 43 | Inga(X) Mace | 53 | Wife | — | Illinois |
| 44 | Howard Johnson | 46 | Head | — | New York |
| 45 | Jessie Johnson | 42 | Sister | Teacher | New York |
| 46 | Chester Olbert | 53 | Head | Bookkeeper | New York |
| 47 | Anna(X) Olbert | 58 | Wife | — | Germany |
| 48 | Arthur Olbert | 22 | Son | Clerk | New York |
| 49 | James(X) Mcgovern | 50 | Head | Typist | New York |
| 50 | Anna Mcgovern | 45 | Wife | — | New York |
| 51 | James Mcgovern | 15 | Son | — | New York |
| 52 | Cecile Mcgovern | 11 | Daughter | — | New York |
| 53 | Walter Leddy | 43 | Lodger | Patrolman | New York |
| 54 | John Cahill THIS PERSON | 32 | Head | Doctor | New York |
| 55 | Genevieve Cahill | 32 | Wife | — | New York |
| 56 | John Cahill | 5 | Son | — | New York |
| 57 | Kevin Cahill | 3 | Son | — | New York |
| 58 | Michael Cahill | 2 | Son | — | New York |
| 59 | Gerald Cahill | 1 | Son | — | New York |
| 60 | Mary Napolitano | 24 | Maid | Maid | New York |
| 61 | Donald(X) Dow | 33 | Head | Teacher | New York |
| 62 | Anna B. Dow | 24 | Wife | — | Penn. |
| 63 | Donaldson Dow | 1 | Son | — | New York |
| 64 | Alex(X) Lenke | 35 | Head | Retail Grocer | Hungary |
| 65 | Mildred Lenke | 26 | Wife | — | New York |
| 66 | Stewart Lenke | 4 | Son | — | New York |
| 67 | Leon Rosenberg | 21 | Butler | Beautician | Hungary |
| 68 | Ralph Macdermott | 43 | Head | Salesman | Nebraska |
| 69 | Margaret Macdermott | 38 | Wife | — | New York |
| 70 | Jeffrey Macdermott | 13 | Son | — | New York |
| 71 | Richard Macdermott | 7 | Son | — | New York |
| 72 | Philip(X) Labue | 56 | Head | Barber | Italy |
| 73 | Josephine Labue | 52 | Wife | — | Italy |
| 74 | Rose Labue | 25 | Daughter | — | New York |
| 75 | Frank Labue | 23 | Son | Clerk | New York |
| 76 | Phillip Labue | 9 | Son | — | New York |
| 77 | Martha Sweeney | 53 | Head | — | New York |
| 78 | Eleanor Sweeney | 21 | Daughter | Typist | New York |
| 79 | William Lynch | 66 | Lodger | Chauffeur | New York |
| 80 | Rudolph Jara | 37 | Head | Foreman | New York |
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)