JC
John Cahill — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Allegheny-County, Pennsylvania
Our Model Tree links this John Cahill across the 1920, 1930 and 1940 US Censuses in Allegheny-County, Pennsylvania (XGBoost, ~Confirmed) — first a head (b.~1881), then head of a 5-person household.
Age 59
b. ~1881
Male
Head
Born: England
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Allegheny-County, Pennsylvania |
| Surname | Cahill |
| Given Name | John J. Al. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 59 |
| Marital Status | Married |
| Birthplace | England |
| 1935 Residence (City) | Pittsburgh |
| 1935 Residence (County) | Allegheny |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Stenographer |
| Industry | Car-Loading Company |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 980 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth Country | England |
| Birthplace (normalized) | england |
| Occupation | Stenographer |
| Township / Ward | Pittsburgh |
| Est. Birth Year | ~1881 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Cahill | Head | — | 59 | ~1881 |
| Winifred Cahill | Other | — | 61 | ~1879 |
| Elizabeth Cahill | Daughter | — | 29 | ~1911 |
| Helen Cahill | Daughter | — | 26 | ~1914 |
| Rita Cahill | Daughter | — | 24 | ~1916 |
Census Appearances
1920
Allegheny, Pennsylvania
Head, age 39
Allegheny, Pennsylvania · implied b. ~1881 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cahill |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 39 |
| Marital Status | Married |
| Birthplace | England |
| Year of Immigration | 1884 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Merchant |
| Industry | Butter & Egg Store |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Home Owned/Rented | O |
| Home Free/Mortgaged | F |
| Birth Country | England |
| Year of Naturalization | 1884 |
| Birthplace (normalized) | england |
1930
Allegheny, Pennsylvania
Head, age 49
Allegheny, Pennsylvania · implied b. ~1881 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cahill |
| Given Name | John J |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 49 |
| Marital Status | Widowed |
| Birthplace | England |
| Naturalization Status | Naturalized |
| Year of Immigration | 1894 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Merchant |
| Industry | Butter & Eggs Co |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Home Owned/Rented | O |
| Home Value / Rent | 4000 |
| Veteran | Yes |
| Birth Country | England |
| Birthplace (normalized) | england |
1940
Allegheny-County, Pennsylvania
Head, age 59
Allegheny-County, Pennsylvania · implied b. ~1881 — 5 household members
| Surname | Cahill |
| Given Name | John J. Al. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 59 |
| Marital Status | Married |
| Birthplace | England |
| 1935 Residence (City) | Pittsburgh |
| 1935 Residence (County) | Allegheny |
| Naturalization Status | Naturalized |
| Occupation | Stenographer |
| Industry | Car-Loading Company |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 980 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth Country | England |
| Birthplace (normalized) | england |
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.
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This person
Anchor record
John Cahill
Head · 1940 · age 59 · b. ~1881 · Pennsylvania
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Allegheny-County, Pennsylvania
Open full size
1940 US Federal Census — Allegheny-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03667-00374)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John J. Al. Cahill THIS PERSON | 59 | Head | Stenographer | England |
| 2 | Elizabeth Cahill | 29 | Daughter | Stenographer | Pennsylvania |
| 3 | Helen J. Cahill | 26 | Daughter | Stenographer | Pennsylvania |
| 4 | Rita A. Cahill | 24 | Daughter | — | Pennsylvania |
| 5 | Winifred A. Cahill | 61 | Sister | — | England |
| 6 | Anthony De Fillipis | 37 | Head | Barber | Italy |
| 7 | Justine M. De Fillipis | 32 | Wife | — | Pennsylvania |
| 8 | Anthony N. De Fillipis | 7 | Son | — | Pennsylvania |
| 9 | Carmela De Fillipis | 61 | Mother | — | Italy |
| 10 | Clyde A. Hennemuth | 29 | Head | Proprietor | Pennsylvania |
| 11 | Minnie M. Hennemuth | 28 | Wife | — | Pennsylvania |
| 12 | Shirley Hennemuth | 12 | Daughter | — | Pennsylvania |
| 13 | Harry Hennemuth | 11 | Son | — | Pennsylvania |
| 14 | John J. Erickson | 23 | Head | Scarfer | Pennsylvania |
| 15 | Grace G. Erickson | 28 | Wife | — | Pennsylvania |
| 16 | John F. Notekinger | 66 | Head | Watchman | Germany |
| 17 | Rose M. Notekinger | 61 | Wife | — | Germany |
| 18 | Marie K. Notekinger | 30 | Daughter | File Clerk | Pennsylvania |
| 19 | Louis Notekinger | 28 | Son | Automobile Mechanic | Pennsylvania |
| 20 | Clarence Notekinger | 21 | Son | Salesman | Pennsylvania |
| 21 | Rita Notekinger | 20 | Daughter | Bus Girl | Pennsylvania |
| 22 | William Holder | 60 | Head | Waiter | Germany |
| 23 | Mary C. Holder | 50 | Wife | — | Pennsylvania |
| 24 | Anna M. Holder | 15 | Daughter | — | Pennsylvania |
| 25 | William Jr. Holder | 12 | Son | — | Pennsylvania |
| 26 | Peter P. Gortiz | 53 | Head | File Clerk | Pennsylvania |
| 27 | Mary S. Gortiz | 49 | Wife | — | Pennsylvania |
| 28 | Edward A. Gortiz | 26 | Son | Truck Driver | Pennsylvania |
| 29 | Charles J. Gortiz | 22 | Son | Electrician | Pennsylvania |
| 30 | Mercedes D. Gortiz | 20 | Daughter | New Worker | Pennsylvania |
| 31 | Clarence J. Gortiz | 18 | Son | — | Pennsylvania |
| 32 | Mildred R. Gortiz | 9 | Daughter | — | Pennsylvania |
| 33 | William S. Emery | 66 | Head | — | Ohio |
| 34 | Emma H. Emery | 65 | Wife | — | Pennsylvania |
| 35 | Samuel Eginton | 72 | Head | — | Irish Free State |
| 36 | Helen M. Eginton | 67 | Wife | — | New York |
| 37 | Marie Dowd | 82 | Head | — | Pennsylvania |
| 38 | Kelly, James F. Dowd | 53 | Son | Bartender | Pennsylvania |
| 39 | Clara L. Bergman | 50 | Head | — | Pennsylvania |
| 40 | Walter C. Streyle | 53 | Lodger | Carpenter | Pennsylvania |
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)