JL
Joseph Leonard — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Essex-County, New Jersey
Our Model Tree links this Joseph Leonard across the 1930 and 1940 US Censuses in Essex-County, New Jersey (XGBoost, ~Confirmed) — first a son (b.~1925), then head of a 9-person household.
Age 15
b. ~1925
Male
Son
Born: New Jersey
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Essex-County, New Jersey |
| Surname | Leonard |
| Given Name | Joseph |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | Belleville |
| 1935 Residence (County) | Essex |
| Additional Details | |
| Highest Grade | No 3 |
| 1935 Residence | Same Place |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Township / Ward | Belleville |
| Est. Birth Year | ~1925 |
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 Joseph | Age | Birth yr |
|---|---|---|---|---|
| Josephine Leonard | Daughter | — | 14 | ~1926 |
| Anne Leonard | Daughter | — | 15 | ~1925 |
| Dorothy Leonard | Daughter | — | 4 | ~1936 |
| Mike Leonard | Head | — | 45 | ~1895 |
| Joseph Leonard | Son | — | 15 | ~1925 |
| Mary Leonard | Spouse | — | 38 | ~1902 |
| Frances Leonard | Daughter | — | 12 | ~1928 |
| Anthony Leonard | Son | — | 8 | ~1932 |
| Michael Leonard | Son | — | 1 | ~1939 |
Census Appearances
1930
Hudson, New …
Son, age 4
Hudson, New Jersey · implied b. ~1926 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Leonard |
| Given Name | Joseph |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | New Jersey |
| Mother's Birthplace | New York |
| Veteran | No |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1940
Essex-County, New …
Son, age 15
Essex-County, New Jersey · implied b. ~1925 — 9 household members
| Surname | Leonard |
| Given Name | Joseph |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | Belleville |
| 1935 Residence (County) | Essex |
| Highest Grade | No 3 |
| 1935 Residence | Same Place |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
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 Joseph Leonard across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Joseph Leonard
Son · 1940 · age 15 · b. ~1925 · New Jersey
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Sibling
Josephine Leonard
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dorothy Leonard
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Michael Leonard
Sibling · 1940 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anthony Leonard
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anne Leonard
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frances Leonard
Sibling · 1940 · age 12
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 — Essex-County, New Jersey
Open full size
1940 US Federal Census — Essex-County, New Jersey
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02328-00660)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Andrew Lontka | 29 | Son | Assembler | New Jersey |
| 2 | Bernard Lontka | 16 | Son | — | New Jersey |
| 3 | Dorothy Lontka | 15 | daughter | — | New Jersey |
| 4 | John Lontka | 35 | Head | Radio Technician | New Jersey |
| 5 | Mary Lontka | 33 | Wife | — | New Jersey |
| 6 | Richard Lontka | 8 | Son | — | New Jersey |
| 7 | Josephine Skoupha | 63 | Mother-in-law | — | Poland |
| 8 | Carmen Triano | 31 | Head | Laborer | New Jersey |
| 9 | Lillian Triano | 31 | Wife | — | New Jersey |
| 10 | Fred Triano | 10 | Son | — | New Jersey |
| 11 | Phylis Triano | 8 | daughter | — | New Jersey |
| 12 | Charles Triano | 7 | Son | — | New Jersey |
| 13 | Lillian Triano | 6 | daughter | — | New Jersey |
| 14 | John Triano | 4 | Son | — | New Jersey |
| 15 | Fortunato Triano | 73 | Father | Junk Dealer | Italy |
| 16 | Rocco Marsicano | 50 | Head | Weaver | Italy |
| 17 | Angeline Marsicano | 37 | Wife | — | Italy |
| 18 | Frank Marsicano | 18 | Son | — | New Jersey |
| 19 | Charles Marsicano | 13 | Son | — | New Jersey |
| 20 | Joseph Marsicano | 10 | Son | — | New Jersey |
| 21 | Sal Marsicano | 3 | Son | — | New Jersey |
| 22 | Sal Monaco | 27 | Head | Barber | Pennsylvania |
| 23 | Ann Monaco | 23 | Wife | — | New Jersey |
| 24 | Ann Monaco | 2 | daughter | — | New Jersey |
| 25 | Anthony Curcio | 68 | Head | Watchman | Italy |
| 26 | Frank Curcio | 30 | Son | Laborer | New Jersey |
| 27 | Anthony Curcio | 12 | Son | — | New Jersey |
| 28 | Mike Leonard | 45 | Head | — | Italy |
| 29 | Mary Leonard | 38 | Wife | — | New Jersey |
| 30 | Anne Leonard | 15 | daughter | — | New Jersey |
| 31 | Josephine Leonard | 14 | daughter | — | New Jersey |
| 32 | Frances Leonard | 12 | daughter | — | New Jersey |
| 33 | Joseph Leonard THIS PERSON | 15 | Son | — | New Jersey |
| 34 | Anthony Leonard | 8 | Son | — | New Jersey |
| 35 | Dorothy Leonard | 4 | daughter | — | New Jersey |
| 36 | Michael Jr. Leonard | 1 | Son | — | New Jersey |
| 37 | Dominick Mongiello | 51 | Head | Bartender | Italy |
| 38 | Catherine Mongiello | 43 | Wife | Assembler | Hungary |
| 39 | Virgil Mongiello | 22 | Son | Machinist | New Jersey |
| 40 | Arthur Mongiello | 21 | Son | Driver | New Jersey |
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)