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Robert Leonard — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Robert Leonard across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1926), then head of a 9-person household.
Age 14
b. ~1926
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Leonard |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| Additional Details | |
| Hours Worked | 0 |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago |
| 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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Robert | Age | Birth yr |
|---|---|---|---|---|
| Mary Gleason | Daughter | — | 14 | ~1926 |
| Elizabeth Mullane | Other | — | 68 | ~1872 |
| Helen Leonard | Spouse | — | 38 | ~1902 |
| Helen Leonard | Daughter | — | 5 | ~1935 |
| John Gleason | Head | — | 46 | ~1894 |
| Robert Leonard | Son | — | 14 | ~1926 |
| John Leonard | Son | — | 16 | ~1924 |
| John Gleason | Son | — | 15 | ~1925 |
| Margaret Gleason | Spouse | — | 45 | ~1895 |
Census Appearances
1930
Cook, Illinois
Son, age 4
Cook, Illinois · implied b. ~1926 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Leonard |
| Given Name | Robert E |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 14
Cook-County, Illinois · implied b. ~1926 — 9 household members
| Surname | Leonard |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| Hours Worked | 0 |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 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 Robert Leonard across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Robert Leonard
Son · 1940 · age 14 · b. ~1926 · Illinois
★ You are viewing this record
Sibling
Helen Leonard
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Gleason
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Leonard
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Gleason
Sibling · 1940 · age 14
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 — 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-t0627-00953-00236)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Ruth O'Neill | 18 | Daughter | — | Illinois |
| 42 | Eugene Jr. O'Neill | 16 | Son | — | Illinois |
| 43 | Mrs. Mary O'Neill | 75 | Aunt | — | Canada-English |
| 44 | R. Kehoe | 53 | Brother | High School Teacher | Illinois |
| 45 | Lionel La Plante | 31 | Head | Salesman | French Canada |
| 46 | Alma La Plante | 28 | Wife | — | French Canada |
| 47 | Georgette La Plante | 5 | Daughter | — | New Jersey |
| 48 | Lionel Jr. La Plante | 3 | Son | — | New Jersey |
| 49 | John F. Mcmahon | 42 | Head | Police Officer | Illinois |
| 50 | Katherine Mcmahon | 41 | Wife | — | Illinois |
| 51 | Mary Mcmahon | 16 | Daughter | — | Illinois |
| 52 | John Mcmahon | 12 | Son | — | Illinois |
| 53 | Elizabeth Wall | 44 | Sister | Office Clerk | Illinois |
| 54 | Julia Wall | 46 | Head | Asst. Book | Illinois |
| 55 | Charlotte Burns | 75 | Aunt | — | Illinois |
| 56 | Hayden E. Simpson | 50 | Head | Real Estate | Nebraska |
| 57 | Gertrude E. Simpson | 45 | Wife | Practical Nurse | Missouri |
| 58 | Mary Ruane | 63 | Head | — | Irish Free State |
| 59 | Mary Ruane | 30 | Daughter | Typing | Illinois |
| 60 | Katherine Ruane | 28 | Daughter | Stenographer | Illinois |
| 61 | John Ruane | 26 | Son | Grocer | New York |
| 62 | Michael Ruane | 24 | Son | Office Clerk | New York |
| 63 | Walter Ruane | 22 | Son | Asst. Mail Clerk | Illinois |
| 64 | Sarah O'Mara | 60 | Head | — | Iowa |
| 65 | Patrick Grady | 57 | Head | Real Estate | Ireland-No. |
| 66 | Bess E. Grady | 61 | Sister | — | Ireland-No. |
| 67 | Lucille O'Malley | 35 | Wife | Gen. Office | Illinois |
| 68 | Helen O'Malley | 38 | Niece | — | Illinois |
| 69 | James A. Kearns | 69 | Head | — | Ireland-No. |
| 70 | Ellen Kearns | 69 | Wife | — | Illinois |
| 71 | Katherine Kearns | 24 | Daughter | Gen. Office | Illinois |
| 72 | John Gleason | 46 | Head | Construction | Irish Free State |
| 73 | Margaret Gleason | 45 | Wife | Seamstress | Irish Free State |
| 74 | John Gleason | 15 | Son | — | Illinois |
| 75 | Mary Gleason | 14 | Daughter | — | Illinois |
| 76 | Helen Leonard | 38 | Wife | Gen. Office | Illinois |
| 77 | John Leonard | 16 | Son | — | Illinois |
| 78 | Robert Leonard THIS PERSON | 14 | Son | — | Illinois |
| 79 | Helen Leonard | 5 | Daughter | — | Illinois |
| 80 | Elizabeth Mullane | 68 | Mother | — | Irish Free State |
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)