JL
James Leonard — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Nassau-County, New York
Our Model Tree links this James Leonard across the 1930 and 1940 US Censuses in Nassau-County, New York (XGBoost, ~Confirmed) — first a son (b.~1918), then head of a 9-person household.
Age 22
b. ~1918
Male
Son
Born: New York
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Nassau-County, New York |
| Surname | Leonard |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | Garden City Park |
| 1935 Residence (County) | Nassau |
| Additional Details | |
| Occupation | Tracin Operator |
| Industry | General Contracting |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 625 |
| Highest Grade | 7 |
| 1935 Residence | Same House |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
| Occupation | Tracin Operator |
| Township / Ward | Garden City Park |
| Est. Birth Year | ~1918 |
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 James | Age | Birth yr |
|---|---|---|---|---|
| Louise Leonard | Daughter | — | 24 | ~1916 |
| Madeline Leonard | Daughter | — | 27 | ~1913 |
| Mildred Leonard | Daughter | — | 20 | ~1920 |
| Mae Leonard | Daughter | — | 15 | ~1925 |
| Anthony Leonard | Head | — | 64 | ~1876 |
| James Leonard | Son | — | 22 | ~1918 |
| Michael Leonard | Son | — | 17 | ~1923 |
| John Leonard | Son | — | 9 | ~1931 |
| Raffaela Leonard | Spouse | — | 54 | ~1886 |
Census Appearances
1930
Nassau, New …
Son, age 12
Nassau, New York · implied b. ~1918 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Lenard |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | Italy |
| Mother's Birthplace | Italy |
| Can Read/Write | Yes |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1940
Nassau-County, New …
Son, age 22
Nassau-County, New York · implied b. ~1918 — 9 household members
| Surname | Leonard |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | Garden City Park |
| 1935 Residence (County) | Nassau |
| Occupation | Tracin Operator |
| Industry | General Contracting |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 625 |
| Highest Grade | 7 |
| 1935 Residence | Same House |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
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 James Leonard across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
James Leonard
Son · 1940 · age 22 · b. ~1918 · New York
★ You are viewing this record
Sibling
Madeline Leonard
Sibling · 1940 · age 27
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Louise Leonard
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Leonard
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Michael Leonard
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mae Leonard
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mildred Leonard
Sibling · 1940 · age 20
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 — Nassau-County, New York
Open full size
1940 US Federal Census — Nassau-County, New York
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02692-00426)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Walter Gorski | 16 | Son | New Worker | New York |
| 42 | Lucy Gorski | 13 | Daughter | — | New York |
| 43 | Alfred Gorski | 10 | Son | — | New York |
| 44 | John Petrowski | 31 | Head | Fireman | New Jersey |
| 45 | Jeanette Petrowski | 27 | Wife | — | New York |
| 46 | Stephen Petrowski | 8 | Son | — | New York |
| 47 | Andrew Petrowski | 4 | Son | — | New York |
| 48 | Robert Petrowski | 0 | Son | — | New York |
| 49 | John Marshall | 26 | Head | Plumbers Helper | New Jersey |
| 50 | Sabina Marshall | 21 | Wife | Laundress | New York |
| 51 | Louis Staniszewski | 16 | Step brother | New Worker | New York |
| 52 | Eleanor Staniszewski | 13 | Step sister | — | New York |
| 53 | Patrier Raso | 25 | Head | Laborer | New York |
| 54 | Theresa Raso | 25 | Wife | Laundress | New York |
| 55 | Robert Raso | 2 | Son | — | New York |
| 56 | Hilda Schumann | 29 | Head | Saleslady | Austria |
| 57 | Harry Schumann | 13 | Son | — | New York |
| 58 | Roland Lindberg | 29 | Head | Auto Mechanic | Sweden |
| 59 | Alice Lindberg | 30 | Wife | — | New York |
| 60 | Joan Lindberg | 9 | Daughter | — | New York |
| 61 | Alice Lindberg | 2 | Daughter | — | New York |
| 62 | Doris Mallin | 8 | Lodger | — | New York |
| 63 | David Mallin | 3 | Lodger | — | Mass |
| 64 | Anthony Leonard | 64 | Head | Cement Block Maker | Italy |
| 65 | Raffaela Leonard | 54 | Wife | — | Italy |
| 66 | Madeline Leonard | 27 | Daughter | Waitress | New York |
| 67 | Louise Leonard | 24 | Daughter | Waitress | New York |
| 68 | James Leonard THIS PERSON | 22 | Son | Tracin Operator | New York |
| 69 | Mildred Leonard | 20 | Daughter | Waitress | New York |
| 70 | Michael Leonard | 17 | Son | New Worker | New York |
| 71 | Mae Leonard | 15 | Daughter | — | New York |
| 72 | John Leonard | 9 | Son | — | New York |
| 73 | Ellen D. Boardman | 59 | Head | Insurance Agent | England |
| 74 | Albert L. Boardman | 26 | Son | Bookkeeper | New York |
| 75 | Lillie Boardman | 24 | Daughter | Book Examiner | New York |
| 76 | Antonio De Mondo | 33 | Head | Laborer | Italy |
| 77 | Margaret De Mondo | 31 | Wife | — | New York |
| 78 | Michael De Mondo | 12 | Son | — | New York |
| 79 | Carmella De Mondo | 10 | Daughter | — | New York |
| 80 | Anna De Mondo | 6 | Daughter | — | New York |
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)