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John Cahill — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Philadelphia-County, Pennsylvania
Our Model Tree links this John Cahill across the 1930 and 1940 US Censuses in Philadelphia-County, Pennsylvania (XGBoost, ~Confirmed) — first a son (b.~1924), then head of a 8-person household.
Age 16
b. ~1924
Male
Son
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Philadelphia-County, Pennsylvania |
| Surname | Cahill |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Philadelphia City |
| 1935 Residence (County) | Philadelphia |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | H 1 |
| 1935 Residence | Same House |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Township / Ward | Philadelphia City |
| Est. Birth Year | ~1924 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Katherine Cahill | Daughter | — | 22 | ~1918 |
| Joseph Cahill | Son | — | 5 | ~1935 |
| John Cahill | Son | — | 16 | ~1924 |
| Lawrence Cahill | Son | — | 23 | ~1917 |
| Lawrence Cahill | Head | — | 45 | ~1895 |
| Regina Cahill | Daughter | — | 10 | ~1930 |
| Raymond Cahill | Son | — | 19 | ~1921 |
| Marie Cahill | Spouse | — | 44 | ~1896 |
Census Appearances
1930
Philadelphia, Pennsylvania
Other, age 6
Philadelphia, Pennsylvania · implied b. ~1924 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cahill |
| Given Name | John |
| Relationship to Head | Nephew |
| Sex | M |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Philadelphia-County, Pennsylvania
Son, age 16
Philadelphia-County, Pennsylvania · implied b. ~1924 — 8 household members
| Surname | Cahill |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Philadelphia City |
| 1935 Residence (County) | Philadelphia |
| Class of Worker | 0 |
| Highest Grade | H 1 |
| 1935 Residence | Same House |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
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 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Cahill
Son · 1940 · age 16 · b. ~1924 · Pennsylvania
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Sibling
Regina Cahill
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lawrence Cahill
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Raymond Cahill
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Katherine Cahill
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Cahill
Sibling · 1940 · age 5
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
1940 US Federal Census — Philadelphia-County, Pennsylvania
Open full size
1940 US Federal Census — Philadelphia-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03700-00216)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | James Daugherty | 15 | Son | — | Pennsylvania |
| 2 | Mary Anderson | 66 | Lodger | — | New York |
| 3 | Daniel Rossi | 42 | Head | Truck Driver | Pennsylvania |
| 4 | Rose Rossi | 45 | Wife | — | Pennsylvania |
| 5 | Daniel Rossi | 11 | Son | — | Pennsylvania |
| 6 | Ida Mae Rossi | 10 | Daughter | — | Pennsylvania |
| 7 | Dolores Rossi | 10 | Daughter | — | Pennsylvania |
| 8 | John Desantis | 34 | Head | Laborer | Pennsylvania |
| 9 | Anna Desantis | 31 | Wife | — | Pennsylvania |
| 10 | Marie Desantis | 9 | Daughter | — | Pennsylvania |
| 11 | Christine Desantis | 7 | Daughter | — | Pennsylvania |
| 12 | John Desantis | 5 | Son | — | Pennsylvania |
| 13 | Charles Zeltner | 41 | Head | Salesman | Pennsylvania |
| 14 | Ruth Zeltner | 36 | Wife | — | Pennsylvania |
| 15 | Charles Zeltner | 18 | Son | Janitor | Pennsylvania |
| 16 | Paul Zeltner | 17 | Son | New Worker | Pennsylvania |
| 17 | Ruth Zeltner | 16 | Daughter | — | Pennsylvania |
| 18 | James Zeltner | 10 | Son | — | Pennsylvania |
| 19 | Walter Zeltner | 8 | Son | — | Pennsylvania |
| 20 | Mary Lou Zeltner | 7 | Daughter | — | Pennsylvania |
| 21 | Anna Mae Zeltner | 6 | Daughter | — | Pennsylvania |
| 22 | Kenneth Zeltner | 3 | Son | — | Pennsylvania |
| 23 | Francis Nicholson | 26 | Lodger | Welder | Pennsylvania |
| 24 | Lawrence Mccormick | 37 | Head | Guard | Pennsylvania |
| 25 | Susan Mccormick | 37 | Wife | — | Pennsylvania |
| 26 | Lawrence Mccormick | 19 | Son | Painter Helper | Pennsylvania |
| 27 | Daniel Mccormick | 15 | Son | — | Pennsylvania |
| 28 | Charles Harmon | 42 | Head | Paper Maker | Pennsylvania |
| 29 | Margaret Harmon | 54 | Wife | — | Pennsylvania |
| 30 | Katherine Schofield | 36 | Mother-in-law | Twister | Pennsylvania |
| 31 | Lawrence Cahill | 45 | Head | Policeman | Pennsylvania |
| 32 | Marie Cahill | 44 | Wife | — | Pennsylvania |
| 33 | Lawrence Cahill | 23 | Son | Cutter | Pennsylvania |
| 34 | Katherine Cahill | 22 | Daughter | Stenographer | Pennsylvania |
| 35 | Raymond Cahill | 19 | Son | — | Pennsylvania |
| 36 | John Cahill THIS PERSON | 16 | Son | — | Pennsylvania |
| 37 | Regina Cahill | 10 | Daughter | — | Pennsylvania |
| 38 | Joseph Cahill | 5 | Son | — | Pennsylvania |
| 39 | James O'Neill | 71 | Head | — | W. Wales |
| 40 | Thomas O'Neill | 65 | Brother | — | W. Wales |
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)