JL
John Leach — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Kings-County, New York
Our Model Tree links this John Leach across the 1930 and 1940 US Censuses in Kings-County, New York (XGBoost, ~Confirmed) — first a son (b.~1913), then head of a 6-person household.
Age 27
b. ~1913
Male
Son
Born: England
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Kings-County, New York |
| Surname | Leach |
| Given Name | John W |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Married |
| Birthplace | England |
| 1935 Residence (City) | Bklyn |
| 1935 Residence (County) | Kings |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Machinist |
| Industry | Builder |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 814 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth Country | England |
| Birthplace (normalized) | england |
| Occupation | Machinist |
| Township / Ward | Bklyn |
| Est. Birth Year | ~1913 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Ireen Leach | Daughter | — | 23 | ~1917 |
| Fred Leach | Head | — | 55 | ~1885 |
| Emily Leach | Spouse | — | 54 | ~1886 |
| Gertrude Leach | Daughter | — | 19 | ~1921 |
| Dorothy Leach | Daughter | — | 23 | ~1917 |
| John Leach | Son | — | 27 | ~1913 |
Census Appearances
1930
Kings, New …
Son, age 17
Kings, New York · implied b. ~1913 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Leach |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | England |
| Naturalization Status | Alien |
| Year of Immigration | 1920 |
| Father's Birthplace | England |
| Mother's Birthplace | England |
| Occupation | Carpenter |
| Industry | Ship Yard |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Birth Country | England |
| Birthplace (normalized) | england |
1940
Kings-County, New …
Son, age 27
Kings-County, New York · implied b. ~1913 — 6 household members
| Surname | Leach |
| Given Name | John W |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Married |
| Birthplace | England |
| 1935 Residence (City) | Bklyn |
| 1935 Residence (County) | Kings |
| Naturalization Status | Naturalized |
| Occupation | Machinist |
| Industry | Builder |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 814 |
| Highest Grade | Hs 4 |
| 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 Leach across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Leach
Son · 1940 · age 27 · b. ~1913 · New York
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Sibling
Gertrude Leach
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ireen Leach
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dorothy Leach
Sibling · 1940 · age 23
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-t0627-02554-00492)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Georgina Hamilton | 34 | Wife | Housewife | Scotland |
| 42 | June L Hamilton | 17 | Daughter | New Worker | NY |
| 43 | William R Hamilton | 16 | Son | — | NY |
| 44 | Ronald A Hamilton | 10 | Son | — | NY |
| 45 | Patricia J Hamilton | 9 | Daughter | — | NY |
| 46 | Emma Walters | 77 | Head | Housewife | NY |
| 47 | Lillian Walters | 37 | Daughter | Cashier | NY |
| 48 | Matthew O'Reilly | 52 | Head | Motorman | Ireland |
| 49 | Ag Mary O'Reilly | 50 | Wife | Housewife | Ireland |
| 50 | Ileen O'Reilly | 16 | Daughter | New Worker | NY |
| 51 | Virginia O'Reilly | 14 | Daughter | — | NY |
| 52 | Mathew O'Reilly | 12 | Son | — | NY |
| 53 | Mary O'Reilly | 11 | Daughter | — | NY |
| 54 | Harold Burfeind | 21 | Son-in-law | Chauffer | NY |
| 55 | Rosetta Burfeind | 17 | Daughter | Housewife | NY |
| 56 | Mathew Burfeind | 0 | Grandson | — | NY |
| 57 | John J Quinn | 37 | Head | Electrician | NY |
| 58 | Mary A Quinn | 33 | Wife | Housewife | NY |
| 59 | John Quinn | 13 | Son | — | NY |
| 60 | Beatrice Ford | 71 | Mother-in-law | Housewife | Ireland |
| 61 | Charles Connell | 60 | Head | Machinist | Mass |
| 62 | Anna Connell | 55 | Wife | Housewife | NY |
| 63 | Margurie Connell | 19 | Daughter | — | NY |
| 64 | Eleanor Connell | 17 | Daughter | — | NY |
| 65 | Ann Connell | 14 | Daughter | — | NY |
| 66 | Charles Connell | 13 | Son | — | NY |
| 67 | John Connell | 10 | Son | — | NY |
| 68 | Fred Leach | 55 | Head | Machinist | England |
| 69 | Emily Leach | 54 | Wife | Housewife | England |
| 70 | John W Leach THIS PERSON | 27 | Son | Machinist | England |
| 71 | Ireen Leach | 23 | Daughter | Weaver | England |
| 72 | Dorothy Leach | 23 | Daughter | Cuntometer | NY |
| 73 | Gertrude Leach | 19 | Daughter | Clerk | NY |
| 74 | Mathew J Mccann | 58 | Head | Police Serg. | NY |
| 75 | Margaret Mccann | 56 | Wife | Housewife | NY |
| 76 | Margaret Mccann | 22 | Daughter | Operator | NY |
| 77 | Francis J Mccann | 26 | Son | Operator | NY |
| 78 | William A Earl | 43 | Head | Machinist | W. Virginia |
| 79 | Mabel Earl | 41 | Wife | Housewife | NY |
| 80 | Henry W Earl | 21 | Son | Punch Press | NY |
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)