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Mary Leach — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Stanislaus-County, California
Our Model Tree links this Mary Leach across the 1930 and 1940 US Censuses in Stanislaus-County, California (XGBoost, ~Confirmed) — first a daughter (b.~1926), then head of a 6-person household.
Age 14
b. ~1926
Female
Daughter
Born: California
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Stanislaus-County, California |
| Surname | Leach |
| Given Name | Mary J. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | Waterford Township |
| 1935 Residence (County) | Stanislaus |
| Additional Details | |
| Highest Grade | No 4 |
| 1935 Residence | Same place |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Township / Ward | Waterford Township |
| Est. Birth Year | ~1926 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Roberta Leach | Daughter | — | 19 | ~1921 |
| Haswell Leach | Head | — | 44 | ~1896 |
| Hazel Leach | Daughter | — | 20 | ~1920 |
| Mary Leach | Daughter | — | 14 | ~1926 |
| Dorothy Leach | Daughter | — | 9 | ~1931 |
| Hazel Leach | Spouse | — | 44 | ~1896 |
Census Appearances
1930
Stanislaus, California
Daughter, age 4
Stanislaus, California · implied b. ~1926 — 17 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Leach |
| Given Name | Mary J. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | California |
| Mother's Birthplace | California |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
Stanislaus-County, California
Daughter, age 14
Stanislaus-County, California · implied b. ~1926 — 6 household members
| Surname | Leach |
| Given Name | Mary J. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | Waterford Township |
| 1935 Residence (County) | Stanislaus |
| Highest Grade | No 4 |
| 1935 Residence | Same place |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
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 Mary Leach across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Leach
Daughter · 1940 · age 14 · b. ~1926 · California
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Sibling
Dorothy Leach
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Hazel Leach
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Roberta Leach
Sibling · 1940 · age 19
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 — Stanislaus-County, California
Open full size
1940 US Federal Census — Stanislaus-County, California
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00353-00671)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Benny Hance | 58 | Head | Farmer | Missouri |
| 42 | Raymond Warren | 26 | Nephew | Laborer | Missouri |
| 43 | Ralph E. Gordon | 49 | Head | Trucking & Grace | Maine |
| 44 | Bernice V. Gordon | 47 | Wife | — | So. Dakota |
| 45 | Kenneth R. Gordon | 14 | Son | — | California |
| 46 | Delene R. Gordon | 10 | Daughter | — | California |
| 47 | Alton Kellner | 47 | Head | — | Germany |
| 48 | Frances Mayer | 52 | Sister | Poultry Producer | Germany |
| 49 | John W. Quisenberry | 56 | Head | Farmer | Virginia |
| 50 | Carrie A. Quisenberry | 44 | Wife | — | Michigan |
| 51 | Marion P. Quisenberry | 15 | Son | — | California |
| 52 | Eva A. Quisenberry | 13 | Daughter | — | California |
| 53 | Haswell T. Leach | 44 | Head | Farmer | California |
| 54 | Hazel Leach | 44 | Wife | — | California |
| 55 | Hazel M. Leach | 20 | Daughter | — | California |
| 56 | Roberta S. Leach | 19 | Daughter | — | California |
| 57 | Mary J. Leach THIS PERSON | 14 | Daughter | — | California |
| 58 | Dorothy C. Leach | 9 | Daughter | — | California |
| 59 | Sherwood R. Leach | 37 | Head | Farmer | California |
| 60 | Isabel Leach | 32 | Wife | — | Utah |
| 61 | Isabel L. Leach | 5 | Daughter | — | California |
| 62 | Robert T. Leach | 0 | Son | — | California |
| 63 | Wheeler S. Baker | 48 | Head | Laborer | Arkansas |
| 64 | Lillie V. Baker | 42 | Wife | — | California |
| 65 | Jack H. Baker | 20 | Son | Kitchen Police | California |
| 66 | Raymond H. Baker | 17 | Son | — | California |
| 67 | Davis V. Baker | 13 | Son | — | California |
| 68 | William J. Norton | 73 | Head | Farmer | Canada |
| 69 | Lottie B. Norton | 67 | Wife | — | Kansas |
| 70 | Lucile E. Des Jardins | 55 | Head | — | Iowa |
| 71 | Paul S. Des Jardins | 31 | Son | Farmer | Louisiana |
| 72 | Louise M. Des Jardins | 22 | Daughter | Clerk | Louisiana |
| 73 | Richard E. Des Jardins | 34 | Son | Farmer | Louisiana |
| 74 | Dorothy E. Des Jardins | 32 | Daughter-in-law | — | Washington |
| 75 | Ellen L. Des Jardins | 2 | Granddaughter | — | California |
| 76 | Lucile A. Des Jardins | 0 | Granddaughter | — | California |
| 77 | Mesac A. Gravelle | 57 | Head | Laborer | Canada |
| 78 | Etta M. Gravelle | 50 | Wife | — | Missouri |
| 79 | Noel O. Gravelle | 6 | Son | — | California |
| 80 | Robert A. Cantrell | 34 | Head | Farmer | 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)