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William Leonard — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this William Leonard across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Fred & Anna — first a head (b.~1913), then head of a 4-person household.
Age 27
b. ~1913
Male
Head
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Leonard |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Copy Reader |
| Industry | Newspaper |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1660 |
| Highest Grade | H-4 |
| 1935 Residence | Same Place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Copy Reader |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1913 |
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 William | Age | Birth yr |
|---|---|---|---|---|
| Ellen Leonard | Daughter | — | 23 | ~1917 |
| William Leonard | Head | — | 27 | ~1913 |
| James Leonard | Son | — | 22 | ~1918 |
| Edward Leonard | Son | — | 18 | ~1922 |
Census Appearances
1920
Cook, Illinois
Son, age 8
Cook, Illinois · implied b. ~1912 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Leonard |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Son, age 18
Cook, Illinois · implied b. ~1912 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Leonhard |
| Given Name | Willard |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | Office Clerk |
| Industry | Heating plant |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Head, age 27
Cook-County, Illinois · implied b. ~1913 — 4 household members
| Surname | Leonard |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | Copy Reader |
| Industry | Newspaper |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1660 |
| Highest Grade | H-4 |
| 1935 Residence | Same Place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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 Fred Leonard (~0.92 confidence) and mother Anna Leonard (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Fred Leonard
b. ~1881
Source father
● Household
· direct · ~0.92
Mother
Anna Leonard
b. ~1883
Source mother
● Household
· direct · ~0.92
This person
Anchor record
William Leonard
Head · 1940 · age 27 · b. ~1913 · Illinois
★ 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 — Cook-County, Illinois
Open full size
1940 US Federal Census — Cook-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00958-00286)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | William Leonard THIS PERSON | 27 | Head | Copy Reader | Illinois |
| 2 | Ellen Leonard | 23 | Daughter | Demonstrator | Illinois |
| 3 | James Leonard | 22 | Son | Clerk | Illinois |
| 4 | Edward J. Leonard | 18 | Son | Laborer | Illinois |
| 5 | Albert Q. Burke | 67 | Head | Clerk Retired | Canada |
| 6 | Hanna Burke | 52 | Wife | — | Sweden |
| 7 | Arthur Tabell | 45 | Head | Mailcarrier | New York |
| 8 | Mary Tabell | 43 | Wife | — | Texas |
| 9 | Matthew Schneider | 51 | Head | Conductor | Illinois |
| 10 | Mary Schneider | 50 | Wife | — | Austria |
| 11 | Marie Schneider | 27 | Daughter | Operator | Illinois |
| 12 | Edna Schneider | 24 | Daughter | Credit Clerk | Illinois |
| 13 | Philomena Silhavy | 77 | Mother-in-law | — | Illinois |
| 14 | Bernard Burke | 32 | Head | Foreman | Illinois |
| 15 | Ediline Burke | 32 | Wife | — | Illinois |
| 16 | Mary Burke | 1 | Daughter | — | Illinois |
| 17 | Sharon Burke | 0 | Daughter | — | Illinois |
| 18 | Richard Crowley | 60 | Head | Lather | Canada |
| 19 | Margaret Crowley | 60 | Wife | — | Maryland |
| 20 | William Crowley | 38 | Son | — | Illinois |
| 21 | Edwin Watkins | 42 | Lodger | — | Pennsylvania |
| 22 | Josephine Watkins | 37 | Lodger | 2Nd Girl | Illinois |
| 23 | Joseph Ochsenfeld | 51 | Head | Foreman | Hungary |
| 24 | Mary Ochsenfeld | 47 | Wife | — | Illinois |
| 25 | Martha Ochsenfeld | 27 | Daughter | Stenographer | Illinois |
| 26 | Joseph Ochsenfeld | 21 | Son | Clerk | Illinois |
| 27 | Thomas Mcgrail | 52 | Head | — | Eire |
| 28 | Beatrice Mcgrail | 47 | Wife | — | Eire |
| 29 | Joseph Mcgrail | 18 | Son | Stock Clerk | Illinois |
| 30 | Barbara Mcgrail | 17 | Daughter | — | Illinois |
| 31 | Roger Mcgrail | 15 | Son | — | Illinois |
| 32 | Lauretta Mcgrail | 12 | Daughter | — | Illinois |
| 33 | John Mcgrail | 10 | Son | — | Illinois |
| 34 | Donald Mcgrail | 8 | Son | — | Illinois |
| 35 | Theresa Mcgrail | 6 | Daughter | — | Illinois |
| 36 | Gustav Peterson | 61 | Head | Draftsman | Germany |
| 37 | Martha Peterson | 50 | Wife | — | Germany |
| 38 | Emma Peterson | 19 | Daughter | — | Pennsylvania |
| 39 | Edwin Olated | 59 | Head | Clerk | Kansas |
| 40 | Rose Olated | 54 | Wife | — | Missouri |
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)