JL
John Leach — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Wayne-County, Michigan
Our Model Tree links this John Leach across the 1930 and 1940 US Censuses in Wayne-County, Michigan (XGBoost, ~Confirmed) — first a son (b.~1930), then head of a 7-person household.
Age 10
b. ~1930
Male
Son
Born: Michigan
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Wayne-County, Michigan |
| Surname | Leach |
| Given Name | John M. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Michigan |
| 1935 Residence (City) | Detroit City |
| 1935 Residence (County) | Wayne |
| Additional Details | |
| Highest Grade | No 5 |
| 1935 Residence | Same place |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
| Township / Ward | Detroit City |
| Est. Birth Year | ~1930 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Bessie Leach | Spouse | — | 42 | ~1898 |
| Michael Loch | Other | — | 50 | ~1890 |
| Paul Leach | Son | — | 6 | ~1934 |
| John Leach | Son | — | 10 | ~1930 |
| Helen Leach | Daughter | — | 17 | ~1923 |
| George Leach | Head | — | 41 | ~1899 |
| George Leach | Son | — | 18 | ~1922 |
Census Appearances
1930
Wayne, Michigan
Son, age 1
Wayne, Michigan · implied b. ~1929 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Lace |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Michigan |
| Father's Birthplace | Italy |
| Mother's Birthplace | Italy |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
1940
Wayne-County, Michigan
Son, age 10
Wayne-County, Michigan · implied b. ~1930 — 7 household members
| Surname | Leach |
| Given Name | John M. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Michigan |
| 1935 Residence (City) | Detroit City |
| 1935 Residence (County) | Wayne |
| Highest Grade | No 5 |
| 1935 Residence | Same place |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
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 10 · b. ~1930 · Michigan
★ You are viewing this record
Sibling
Helen Leach
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
George Leach
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Paul Leach
Sibling · 1940 · age 6
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 — Wayne-County, Michigan
Open full size
1940 US Federal Census — Wayne-County, Michigan
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-01866-00620)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Thomas F. Berkey | 39 | Head | Arch Welder | Michigan |
| 42 | Agnes Berkey | 40 | Wife | Cigarmaker | Michigan |
| 43 | Dolores Berkey | 14 | Daughter | — | Michigan |
| 44 | Edward J. Prusak | 52 | Head | Layout Man | Poland |
| 45 | Anna M. Prusak | 48 | Wife | — | Michigan |
| 46 | John Prusak | 25 | Son | Trimmer | Michigan |
| 47 | Genevieve Prusak | 26 | Daughter | Machine Operator | Michigan |
| 48 | Dorothy Prusak | 24 | Daughter | Typist Clerk | Michigan |
| 49 | Agnes Prusak | 19 | Daughter | — | Michigan |
| 50 | Walter W. Hafeli | 38 | Head | Central Office Clerk | Michigan |
| 51 | Rose A. Hafeli | 35 | Wife | — | Michigan |
| 52 | James H. Hafeli | 13 | Son | — | Michigan |
| 53 | Gerald L. Hafeli | 11 | Son | — | Michigan |
| 54 | Barbara A. Hafeli | 5 | Daughter | — | Michigan |
| 55 | Edgar F. Schmidt | 32 | Head | Stenographer | Michigan |
| 56 | Estelle M. Schmidt | 30 | Wife | — | Ohio |
| 57 | Christine M. Schmidt | 8 | Daughter | — | Michigan |
| 58 | Colette B. Schmidt | 5 | Daughter | — | Michigan |
| 59 | Frank B. Mcinerney | 34 | Head | Bacteriologist | Michigan |
| 60 | Mary E. Mcinerney | 29 | Wife | — | Michigan |
| 61 | Mary Lou Mcinerney | 7 | Daughter | — | Michigan |
| 62 | Patricia Mcinerney | 5 | Daughter | — | Michigan |
| 63 | Michael Mcinerney | 1 | Son | — | Michigan |
| 64 | George Heintz | 33 | Head | Counter Clerk | Michigan |
| 65 | Donna Heintz | 35 | Wife | — | Michigan |
| 66 | John Heintz | 9 | Son | — | Michigan |
| 67 | Edward Heintz | 6 | Son | — | Michigan |
| 68 | George M. Leach | 41 | Head | Assembler | Austria |
| 69 | Bessie M. Leach | 42 | Wife | — | Austria |
| 70 | George A. Leach | 18 | Son | Shoe Shiner | Michigan |
| 71 | Helen D. Leach | 17 | Daughter | — | Michigan |
| 72 | John M. Leach THIS PERSON | 10 | Son | — | Michigan |
| 73 | Paul J. Leach | 6 | Son | — | Michigan |
| 74 | Michael Loch | 50 | Lodger | Door Lapper | Austria |
| 75 | James M. Pulcher | 30 | Head | Filing Clerk | Michigan |
| 76 | Marian A. Pulcher | 23 | Wife | — | Illinois |
| 78 | Joseph J. Swantek | 30 | Head | Milkman | Michigan |
| 79 | Bernice A. Swantek | 30 | Wife | — | Michigan |
| 80 | Eugene J. Swantek | 5 | Son | — | Michigan |
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)