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William Leonard — 1940 US Census Record
Model Tree available1940 United States Federal Census · Marin-County, California
Our Model Tree links this William Leonard across the 1920, 1930 and 1940 US Censuses in Marin-County, California (XGBoost, ~Confirmed), with identified parents Peter & Mary — first a head (b.~1902), then head of a 3-person household.
Age 38
b. ~1902
Male
Head
Born: California
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Marin-County, California |
| Surname | Leonard |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 38 |
| Marital Status | Married |
| Birthplace | California |
| 1935 Residence (City) | Marin |
| Additional Details | |
| Occupation | Carpenter |
| Industry | Building Const |
| Class of Worker | PW |
| Income (1939) | 1600 |
| Highest Grade | No 8 |
| 1935 Residence | California |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Occupation | Carpenter |
| Township / Ward | Fairfax |
| Est. Birth Year | ~1902 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| William Leonard | Head | — | 38 | ~1902 |
| Raymond Leonard | Son | — | 10 | ~1930 |
| Henrietta Leonard | Spouse | — | 34 | ~1906 |
Census Appearances
1920
San Francisco, …
Son, age 18
San Francisco, California · implied b. ~1902 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Leonard |
| Given Name | William J |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | California |
| Mother's Birthplace | Ireland |
| Occupation | Porter |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1930
San Francisco, …
Head, age 28
San Francisco, California · implied b. ~1902 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Leonard |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Married |
| Birthplace | California |
| Age at First Marriage | 23 |
| Father's Birthplace | California |
| Mother's Birthplace | Irish Free State |
| Occupation | Carpenter |
| Industry | House Build |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 32.50 |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
Marin-County, California
Head, age 38
Marin-County, California · implied b. ~1902 — 3 household members
| Surname | Leonard |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 38 |
| Marital Status | Married |
| Birthplace | California |
| 1935 Residence (City) | Marin |
| Occupation | Carpenter |
| Industry | Building Const |
| Class of Worker | PW |
| Income (1939) | 1600 |
| Highest Grade | No 8 |
| 1935 Residence | California |
| 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 William Leonard across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Peter Leonard (~0.92 confidence) and mother Mary Leonard (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Peter Leonard
b. ~1871
Source father
● Household
· direct · ~0.92
Mother
Mary Leonard
b. ~1873
Source mother
● Household
· direct · ~0.92
This person
Anchor record
William Leonard
Head · 1940 · age 38 · b. ~1902 · California
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Marin-County, California
Open full size
1940 US Federal Census — Marin-County, California
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00261-00199)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Robert Ross | 50 | Head | Contractor | Scotland |
| 42 | Irene Ross | 55 | Wife | — | Scotland |
| 43 | Charlotte Robinson | 71 | Head | Dentist | California |
| 44 | Allen Robinson | 46 | Son | — | California |
| 45 | Archie Dace | 41 | Head | Trucker | Massachusetts |
| 46 | Winifred Dace | 21 | Wife | — | California |
| 47 | Earle Dace | 2 | Daughter | — | California |
| 48 | Garrett Mace | 58 | Mother | — | California |
| 49 | Gertrude Spear | 58 | Mother | Saleswoman | California |
| 50 | Thomas Spear | 32 | Son | Dentist | California |
| 51 | Alina Romero | 53 | Head | Practical Nurse | California |
| 52 | Martha Allen | 50 | Head | Doctor | Iowa |
| 53 | Martha Lois Allen | 20 | Daughter | — | California |
| 54 | Jack W. G. Allen | 12 | Son | — | California |
| 55 | Carl Rodgers | 40 | Head | Plumber | Kansas |
| 56 | Rose Rodgers | 35 | Wife | — | England |
| 57 | Robert Rodgers | 13 | Son | — | Washington |
| 58 | Charles Rodgers | 11 | Son | — | Oregon |
| 59 | Marjory Rodgers | 10 | Daughter | — | California |
| 60 | Lois Rodgers | 6 | Son | — | California |
| 61 | Olaf Hansen | 74 | Head | Surgeon Dentist | Norway |
| 62 | Anna Hansen | 63 | Wife | — | Denmark |
| 63 | Norline Hansen | 23 | Daughter | Stenographer | California |
| 64 | Louise Smith | 39 | Head | Clerk | Arizona |
| 65 | Mamie Smith | 36 | Wife | — | Virginia |
| 66 | Carl Smith | 7 | Son | — | Virginia |
| 67 | Chester Kimball | 29 | Head | Clerk | California |
| 68 | Rema Kimball | 26 | Wife | — | California |
| 69 | Kay Kimball | 4 | Daughter | — | California |
| 70 | Barry Kimball | 2 | Daughter | — | California |
| 71 | John Norton | 42 | Head | Driver | Australia |
| 72 | Amy Norton | 43 | Wife | — | New Zealand |
| 73 | June Norton | 14 | Daughter | — | Australia |
| 74 | John Norton | 12 | Son | — | Australia |
| 75 | Patricia Norton | 11 | Daughter | — | Australia |
| 76 | William Leonard THIS PERSON | 38 | Head | Carpenter | California |
| 77 | Henrietta Leonard | 34 | Wife | — | California |
| 78 | Raymond Leonard | 10 | Son | — | California |
| 79 | George Luck | 67 | Head | Tailor | Germany |
| 80 | Anabell Luck | 58 | Wife | — | Colorado |
Pedigree Summary
William
Gen 1 · 2 parents
~0.92
Max depth 4 (1900–1950 window)
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)