JL
John Leach — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Genesee-County, Michigan
Our Model Tree links this John Leach across the 1930 and 1940 US Censuses in Genesee-County, Michigan (XGBoost, ~Confirmed) — first a son (b.~1925), then head of a 5-person household.
Age 15
b. ~1925
Male
Son
Born: Michigan
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Genesee-County, Michigan |
| Surname | Leach |
| Given Name | John C. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Michigan |
| 1935 Residence (City) | Flint |
| 1935 Residence (County) | Genesee |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | H 1 |
| 1935 Residence | Same place |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
| Township / Ward | Flint |
| Est. Birth Year | ~1925 |
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 |
|---|---|---|---|---|
| James Leach | Son | — | 6 | ~1934 |
| John Leach | Son | — | 15 | ~1925 |
| James Leach | Head | — | 45 | ~1895 |
| Donald Leach | Son | — | 12 | ~1928 |
| Charles Leach | Son | — | 9 | ~1931 |
Census Appearances
1930
Genesee, Michigan
Son, age 5
Genesee, Michigan · implied b. ~1925 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Leach |
| Given Name | John C |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Michigan |
| Father's Birthplace | Michigan |
| Mother's Birthplace | South Dakota |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
1940
Genesee-County, Michigan
Son, age 15
Genesee-County, Michigan · implied b. ~1925 — 5 household members
| Surname | Leach |
| Given Name | John C. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Michigan |
| 1935 Residence (City) | Flint |
| 1935 Residence (County) | Genesee |
| Income (1939) | 0 |
| Highest Grade | H 1 |
| 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 15 · b. ~1925 · Michigan
★ You are viewing this record
Sibling
James Leach
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Charles Leach
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Donald Leach
Sibling · 1940 · age 12
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 — Genesee-County, Michigan
Open full size
1940 US Federal Census — Genesee-County, Michigan
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01896-00715)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Cora N. Alexander | 65 | Head | Waitress | Michigan |
| 2 | Walter Guglinski | 34 | Lodger | Machinist | Illinois |
| 3 | Walter P. Neas | 32 | Head | Machinist | Massachusetts |
| 4 | Margaret Neas | 25 | Wife | — | Massachusetts |
| 5 | John J. Neas | 2 | Son | — | Massachusetts |
| 6 | Lawrence Peter | 23 | Head | Minister | Michigan |
| 7 | Beulah Peter | 20 | Wife | Assistant Minister | Alabama |
| 8 | Beulah Jean Peter | 3 | Daughter | — | Michigan |
| 9 | Laura Bennett | 49 | Lodger | — | Michigan |
| 10 | Ellen Merritt | 60 | Lodger | — | Canada-Eng |
| 11 | Catharine Blickley | 59 | Lodger | — | Michigan |
| 12 | Elizabeth Kellogg | 60 | Lodger | — | Michigan |
| 13 | Caroline O'Connell | 42 | Lodger | — | Michigan |
| 14 | Lula Emery | 55 | Lodger | — | Michigan |
| 15 | Anna Gorski | 40 | Lodger | — | Germany |
| 16 | Jenna Acton | 34 | Lodger | — | Illinois |
| 17 | Mae Baldwin | 62 | Matron | Matron | Michigan |
| 18 | Claude Munry | 44 | Janitor | Janitor | Illinois |
| 19 | Ray Baldwin | 17 | Asst Jan. | Assistant Janitor | Washington |
| 20 | Lodema Cross | 83 | Head | — | Michigan |
| 21 | Winifred Cross | 54 | Daughter | — | Michigan |
| 22 | Robert J. Voelker | 45 | Lodger | Factory Worker | Pennsylvania |
| 23 | James Leach | 45 | Head | Stenographer | South Dakota |
| 24 | John C. Leach THIS PERSON | 15 | Son | — | Michigan |
| 25 | Donald A. Leach | 12 | Son | — | Michigan |
| 26 | Charles E. Leach | 9 | Son | — | Michigan |
| 27 | James E. Leach | 6 | Son | — | Michigan |
| 28 | Andrew Yalch | 46 | Head | Inspector | Oklahoma |
| 29 | Ellen Yalch | 46 | Wife | — | Oklahoma |
| 30 | Charles Paul Yalch | 15 | Son | — | Oklahoma |
| 31 | Wayne Skutt | 29 | Head | Collector | Iowa |
| 32 | Geraldine Skutt | 24 | Wife | — | Michigan |
| 33 | Barbara Rae Skutt | 0 | Daughter | — | Michigan |
| 34 | Bessie E. Martin | 44 | Head | Seamstress | Illinois |
| 35 | Christine Martin | 15 | Daughter | — | Missouri |
| 36 | Noeda Martin | 13 | Daughter | — | Missouri |
| 37 | William Martin | 10 | Son | — | Michigan |
| 38 | James Martin | 6 | Son | — | Michigan |
| 39 | Fredrick Wardelman | 25 | Head | Checker | Indiana |
| 40 | Mary L. Wardelman | 22 | Wife | — | Missouri |
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)