JL
John Leary — 1940 US Census Record
Model Tree available1940 United States Federal Census · Hudson-County, New Jersey
Our Model Tree links this John Leary across the 1920, 1930 and 1940 US Censuses in Hudson-County, New Jersey (XGBoost, ~Confirmed), with identified parents Daniel & Patrick — first a head (b.~1909), then head of a 3-person household.
Age 31
b. ~1909
Male
Head
Born: New Jersey
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Hudson-County, New Jersey |
| Surname | Leary |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | New Jersey |
| 1935 Residence (City) | Jersey City |
| 1935 Residence (County) | Hudson |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same Place |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Township / Ward | Jersey City |
| Est. Birth Year | ~1909 |
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 John | Age | Birth yr |
|---|---|---|---|---|
| Lottie Leary | Spouse | — | 30 | ~1910 |
| Michael Leary | Son | — | 7 | ~1933 |
| John Leary | Head | — | 31 | ~1909 |
Census Appearances
1920
Hudson, New …
Son, age 10
Hudson, New Jersey · implied b. ~1910 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Leary |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1930
Hudson, New …
Son, age 20
Hudson, New Jersey · implied b. ~1910 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Leary |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Packer |
| Industry | Swift Plant |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1940
Hudson-County, New …
Head, age 31
Hudson-County, New Jersey · implied b. ~1909 — 3 household members
| Surname | Leary |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | New Jersey |
| 1935 Residence (City) | Jersey City |
| 1935 Residence (County) | Hudson |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 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 John Leary across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Daniel Leary (~0.92 confidence) and father Patrick Leary (~0.92 confidence) and mother Nora Leary (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Daniel Leary
b. ~1878
Source father
● Household
· direct · ~0.92
Father
Patrick Leary
b. ~1881
Source father
● Household
· direct · ~0.92
Mother
Nora Leary
b. ~1879
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Leary
Head · 1940 · age 31 · b. ~1909 · New Jersey
★ 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 — Hudson-County, New Jersey
Open full size
1940 US Federal Census — Hudson-County, New Jersey
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02402-00358)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Joseph Capkowski | 59 | Head | — | Poland |
| 42 | Helen Capkowski | 22 | Daughter | — | New Jersey |
| 43 | Edward Capkowski | 19 | Son | Shipper Packer | New Jersey |
| 44 | Thomas J. O'Connor | 29 | Head | — | New Jersey |
| 45 | Mary E. Mclaughlin | 25 | Niece | File Clerk | New Jersey |
| 46 | Michael Dooling | 41 | Head | Laborer | New Jersey |
| 47 | Richard Dooling | 37 | Brother | Laborer | New Jersey |
| 48 | John Dooling | 33 | Brother | Laborer | New Jersey |
| 49 | John Skowronski | 52 | Head | Packer | Poland |
| 50 | John Casey | 30 | Son in law | — | New Jersey |
| 51 | Nellie Casey | 21 | Daughter | — | New Jersey |
| 52 | Stella Welgos | 26 | Daughter | Counter Man | New Jersey |
| 53 | John Leary THIS PERSON | 31 | Head | — | New Jersey |
| 54 | Lottie Leary | 30 | Wife | Head Waitress | Maryland |
| 55 | Michael Leary | 7 | Son | — | New Jersey |
| 56 | Patrick Burns | 64 | Head | — | Irish Free State |
| 57 | Rose Burns | 67 | Wife | — | Irish Free State |
| 58 | Patrick Burns | 30 | Son | — | New Jersey |
| 59 | Stefania Belka | 32 | Head | Foreman | Poland |
| 60 | Mary Belka | 31 | Wife | Packer | New Jersey |
| 61 | Edward Belka | 17 | Son | — | New Jersey |
| 62 | Frank Campion | 40 | Head | Checker | New Jersey |
| 63 | Mary Campion | 42 | Wife | — | New York |
| 64 | Frank Jr. Campion | 17 | Son | New Worker | New Jersey |
| 65 | John Campion | 15 | Son | — | New Jersey |
| 66 | Dorothy Campion | 13 | Daughter | — | New Jersey |
| 67 | Theresa Campion | 10 | Daughter | — | New Jersey |
| 68 | Adam Krasniewski | 54 | Head | — | Poland |
| 69 | Lottie Krasniewski | 47 | Wife | — | Poland |
| 70 | Clara Krasniewski | 23 | Daughter | Beautician | New Jersey |
| 71 | Theodore Krasniewski | 15 | Son | — | New Jersey |
| 72 | Dorothy Krasniewski | 10 | Daughter | — | New Jersey |
| 73 | Edward Kaminski | 27 | Head | Car Repairer | New Jersey |
| 74 | Cecila Kaminski | 25 | Wife | Hat Maker | New Jersey |
| 75 | Ronald Kaminski | 2 | Son | — | New Jersey |
| 76 | Thomas Cannon | 35 | Head | Grocery Selector | New Jersey |
| 77 | Rose Cannon | 33 | Wife | — | New Jersey |
| 78 | Mary Cannon | 7 | Daughter | — | New Jersey |
| 79 | Thomas Jr. Cannon | 4 | Son | — | New Jersey |
| 80 | Kazmira Sypozek | 52 | Head | — | Poland |
Pedigree Summary
John
Gen 1 · 3 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)