JC
John Cahill — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Kings-County, New York
Our Model Tree links this John Cahill across the 1930 and 1940 US Censuses in Kings-County, New York (XGBoost, ~Confirmed) — first a son (b.~1928), then head of a 8-person household.
Age 12
b. ~1928
Male
Son
Born: New York
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Kings-County, New York |
| Surname | Cahill |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | New York City |
| 1935 Residence (County) | Kings |
| Additional Details | |
| Highest Grade | No 6 |
| 1935 Residence | Same house |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
| Township / Ward | New York City |
| Est. Birth Year | ~1928 |
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 |
|---|---|---|---|---|
| Jean Phinney | Other | — | 14 | ~1926 |
| Joseph Cahill | Head | — | 58 | ~1882 |
| Joseph Cahill | Son | — | 18 | ~1922 |
| Loretta Phinney | Other | — | 48 | ~1892 |
| Wm Cahill | Son | — | 14 | ~1926 |
| Jane Cahill | Daughter | — | 16 | ~1924 |
| John Cahill | Son | — | 12 | ~1928 |
| Maude Cahill | Spouse | — | 46 | ~1894 |
Census Appearances
1930
Kings, New …
Son, age 2
Kings, New York · implied b. ~1928 — 12 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cahill |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | New York |
| Mother's Birthplace | New York |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1940
Kings-County, New …
Son, age 12
Kings-County, New York · implied b. ~1928 — 8 household members
| Surname | Cahill |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | New York City |
| 1935 Residence (County) | Kings |
| Highest Grade | No 6 |
| 1935 Residence | Same house |
| 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 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Cahill
Son · 1940 · age 12 · b. ~1928 · New York
★ You are viewing this record
Sibling
Wm Cahill
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Cahill
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jane Cahill
Sibling · 1940 · age 16
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 — Kings-County, New York
Open full size
1940 US Federal Census — Kings-County, New York
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02613-00074)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Wm W Speckels | 32 | Head | Lawyer | New York |
| 42 | Helen M Speckels | 29 | Wife | Reg Nurse | Mass |
| 43 | Judith Speckels | 2 | Daughter | — | New York |
| 44 | Julia T Blake | 60 | Head | — | Mass |
| 45 | Kathryn Blake | 29 | Daughter | Secretary | New York |
| 46 | John Blake | 27 | Son | Clerk | New York |
| 47 | E Eleanor Tracy | 29 | Niece | Clerk | New York |
| 48 | Caroline Heischmann | 81 | Head | — | Penna |
| 49 | Ruth A Heischmann | 58 | Daughter | Teacher | New York |
| 50 | Joseph W Cahill | 58 | Head | Lawyer | New York |
| 51 | Maude S Cahill | 46 | Wife | Teacher | New York |
| 52 | Joseph Jr. Cahill | 18 | Son | Usher | New York |
| 53 | Jane Cahill | 16 | Daughter | — | New York |
| 54 | Wm Cahill | 14 | Son | — | New York |
| 55 | John Cahill THIS PERSON | 12 | Son | — | New York |
| 56 | Loretta Phinney | 48 | Sister in law | Clerk | New York |
| 57 | Jean Phinney | 14 | Niece | — | New York |
| 58 | Edw H Hombostel | 70 | Head | Adjuster | New York |
| 59 | Marie L S Hombostel | 67 | Wife | — | New York |
| 60 | Johanna Hombostel | 41 | Daughter | — | New York |
| 61 | Chas W Graber | 79 | Head | Broker | Penna |
| 62 | Anne Graber | 46 | Wife | — | Ohio |
| 63 | Lillian S Graber | 23 | Daughter | — | Penna |
| 64 | Genevieve Graber | 18 | Daughter | — | Penna |
| 65 | Virginia Graber | 16 | Daughter | — | New York |
| 66 | Kurt Lutz | 60 | Head | Salesman | Germany |
| 67 | Irene P Lutz | 56 | Wife | — | New York |
| 68 | Elizabeth Lutz | 23 | Daughter | Secretary | New York |
| 69 | Miriam Lutz | 20 | Daughter | — | New York |
| 70 | Maria Shofer | 86 | Mother in law | — | New York |
| 71 | Romeo W Auerbach | 46 | Head | Medical Doctor | New Jersey |
| 72 | Anne S Auerbach | 36 | Wife | — | Vermont |
| 73 | Patricia Ann Auerbach | 5 | Daughter | — | New York |
| 74 | Robert Auerbach | 2 | Son | — | New York |
| 75 | Nina Baker | 28 | Nurse | Nurse | Louisiana |
| 76 | — | None | — | — | — |
| 77 | Jessie B Walton | 56 | Head | Medical Social Worker | New York |
| 78 | Ruth A Walton | 23 | Daughter | Stenographer | New York |
| 79 | Edith A Rivoli | 65 | Cousin | Supervisor | England |
| 80 | Jennie Buthan | 64 | Cousin | Corrector | New York |
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)