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 head (b.~1886), then head of a 4-person household.
Age 54
b. ~1886
Male
Head
Born: Connecticut
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Kings-County, New York |
| Surname | Leach |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 54 |
| Marital Status | Married |
| Birthplace | Connecticut |
| 1935 Residence (City) | Brooklyn |
| 1935 Residence (County) | Kings |
| Additional Details | |
| Occupation | Engineer |
| Industry | Railroad |
| Class of Worker | PW |
| Hours Worked | 10 |
| Income (1939) | 222 |
| Highest Grade | 8 |
| 1935 Residence | Same Place |
| Birth State | Connecticut |
| Birth Country | United States |
| Birthplace (normalized) | connecticut |
| Occupation | Engineer |
| Township / Ward | Brooklyn |
| Est. Birth Year | ~1886 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Jane Leach | Daughter | — | 20 | ~1920 |
| John Leach | Head | — | 54 | ~1886 |
| Irene Leach | Daughter | — | 18 | ~1922 |
| Bertha Leach | Spouse | — | 52 | ~1888 |
Census Appearances
1930
Kings, New …
Head, age 44
Kings, New York · implied b. ~1886 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Leach |
| Given Name | John W. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 44 |
| Marital Status | Married |
| Birthplace | Connecticut |
| Age at First Marriage | 32 |
| Father's Birthplace | Connecticut |
| Mother's Birthplace | Connecticut |
| Occupation | Stat. Engineer |
| Industry | Coal Co. |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 50.00 |
| Radio Set | R |
| Birth State | Connecticut |
| Birth Country | United States |
| Birthplace (normalized) | connecticut |
1940
Kings-County, New …
Head, age 54
Kings-County, New York · implied b. ~1886 — 4 household members
| Surname | Leach |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 54 |
| Marital Status | Married |
| Birthplace | Connecticut |
| 1935 Residence (City) | Brooklyn |
| 1935 Residence (County) | Kings |
| Occupation | Engineer |
| Industry | Railroad |
| Class of Worker | PW |
| Hours Worked | 10 |
| Income (1939) | 222 |
| Highest Grade | 8 |
| 1935 Residence | Same Place |
| Birth State | Connecticut |
| Birth Country | United States |
| Birthplace (normalized) | connecticut |
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.
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This person
Anchor record
John Leach
Head · 1940 · age 54 · b. ~1886 · New York
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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 — Kings-County, New York
Open full size
1940 US Federal Census — Kings-County, New York
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-02608-00921)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Gladys Ratt | 51 | Head | Cashier | New York |
| 42 | Thomas Cavanaugh | 50 | Head | Chauffeur | New York |
| 43 | Kathryn Cavanaugh | 39 | Wife | — | New York |
| 44 | Mae Cavanaugh | 19 | Daughter | Typist | New York |
| 45 | Jane Cavanaugh | 7 | Daughter | — | New York |
| 46 | Lynwood Hoffman | 32 | Head | Oiler | Pennsylvania |
| 47 | Agnes Hoffman | 24 | Wife | — | Eire |
| 48 | Charles Hoffman | 5 | Son | — | New York |
| 49 | George Schwarz | 57 | Head | — | England |
| 50 | Martha Schwarz | 23 | Son | Floorman | New York |
| 51 | Hazel Schwarz | 27 | Daughter | Supervisor | New York |
| 52 | Gloria Schwarz | 17 | Daughter | — | New York |
| 53 | Joseph Kagate | 63 | Head | Baker | Italy |
| 54 | Bertha Kagate | 51 | Wife | Operator | Italy |
| 55 | Rose Kagate | 14 | Daughter | — | New York |
| 56 | Thomas Mccalmont | 61 | Head | Wire Maker | New York |
| 57 | Mary Mccalmont | 56 | Wife | — | New York |
| 58 | Howard Mccalmont | 30 | Son | Estimator | New York |
| 59 | Mildred Mccalmont | 28 | Daughter | Clerk | New York |
| 60 | Anthony Percuoco | 59 | Head | — | Italy |
| 61 | Elsie Percuoco | 59 | Wife | — | Italy |
| 62 | Mary Percuoco | 28 | Daughter | Packer | New York |
| 63 | Fiorello Percuoco | 26 | Son | — | New York |
| 64 | Josephine Percuoco | 23 | Daughter | Packer | New York |
| 65 | Ralph Percuoco | 21 | Son | Packer | New York |
| 66 | Antoinette Percuoco | 25 | Daughter | — | New York |
| 67 | Richard Deutscher | 49 | Head | Baker | Germany |
| 68 | Margaret Deutscher | 40 | Wife | Cook | Germany |
| 69 | John Leach THIS PERSON | 54 | Head | Engineer | Connecticut |
| 70 | Bertha Leach | 52 | Wife | Operator | Pennsylvania |
| 71 | Jane Leach | 20 | Daughter | Canner | Connecticut |
| 72 | Irene Leach | 18 | Daughter | — | New York |
| 73 | Francis Cherrie | 56 | Head | Gateman | New York |
| 74 | Emily Cherrie | 54 | Wife | — | New York |
| 75 | Peter Wolf | 61 | Head | Dentist | New York |
| 76 | Christine Wolf | 58 | Wife | — | New York |
| 77 | Edna Wolf | 56 | Sister | — | New York |
| 78 | Fabrizio Piovino | 70 | Head | — | Italy |
| 79 | Lucian Piovino | 45 | Son | Tailor | Italy |
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)