JD
John Dempsey — 1940 US Census Record
Model Tree available1940 United States Federal Census · Hudson-County, New Jersey
Our Model Tree links this John Dempsey across the 1920, 1930 and 1940 US Censuses in Hudson-County, New Jersey (XGBoost, ~Confirmed), with identified parents Clements & Helen — first a head (b.~1912), then head of a 3-person household.
Age 28
b. ~1912
Male
Head
Born: New Jersey
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Hudson-County, New Jersey |
| Surname | Dempsey |
| Given Name | John (X) |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Married |
| Birthplace | New Jersey |
| 1935 Residence (City) | JERSEY CITY |
| 1935 Residence (County) | HUDSON |
| Additional Details | |
| Occupation | Laborer |
| Industry | Construction Company |
| Class of Worker | PW |
| Hours Worked | 16 |
| Income (1939) | 988 |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Occupation | Laborer |
| Township / Ward | Jersey City |
| Est. Birth Year | ~1912 |
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 |
|---|---|---|---|---|
| John Dempsey | Head | — | 28 | ~1912 |
| Margaret Dempsey | Daughter | — | 5 | ~1935 |
| Agnes Dempsey | Spouse | — | 32 | ~1908 |
Census Appearances
1920
Hudson, New …
Son, age 8
Hudson, New Jersey · implied b. ~1912 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Dempsey |
| Given Name | John G. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | New Jersey |
| Mother's Birthplace | New Jersey |
| 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 18
Hudson, New Jersey · implied b. ~1912 — 12 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Dempsey |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | New Jersey |
| Mother's Birthplace | New Jersey |
| Occupation | Junior Clerk |
| Industry | Bank |
| 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 28
Hudson-County, New Jersey · implied b. ~1912 — 3 household members
| Surname | Dempsey |
| Given Name | John (X) |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Married |
| Birthplace | New Jersey |
| 1935 Residence (City) | JERSEY CITY |
| 1935 Residence (County) | HUDSON |
| Occupation | Laborer |
| Industry | Construction Company |
| Class of Worker | PW |
| Hours Worked | 16 |
| Income (1939) | 988 |
| Highest Grade | No 7 |
| 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 Dempsey across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Clements Appleman (~0.92 confidence) and mother Helen Dempsey (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Clements Appleman
b. ~1898
Source father
● Household
· direct · ~0.92
Mother
Helen Dempsey
b. ~1892
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Dempsey
Head · 1940 · age 28 · b. ~1912 · 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-t0627-02401-00050)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Nora (X) Coyne | 61 | Head | — | Ireland |
| 2 | William Coyne | 27 | Son | Electrician'S Helper | New Jersey |
| 3 | Charles Talbot | 56 | Head | Handy Man | New Jersey |
| 4 | Elizabeth (X) Talbot | 53 | Wife | — | New Jersey |
| 5 | Charles Talbot | 23 | Son | Helper | New Jersey |
| 6 | William Talbot | 19 | Son | File Clerk | New Jersey |
| 7 | Elizabeth Talbot | 17 | Daughter | — | New Jersey |
| 8 | Francis Talbot | 14 | Son | — | New Jersey |
| 9 | Joseph Sullivan | 25 | Son in law | Laborer | New Jersey |
| 10 | Cecilia Sullivan | 24 | Daughter | — | New Jersey |
| 11 | Patricia Sullivan | 3 | Daughter | — | New Jersey |
| 12 | Margaret Sullivan | 1 | Daughter | — | New Jersey |
| 13 | Simon Ostapko | 55 | Head | Watch Repairer | Poland |
| 14 | Helen (X) Ostapko | 54 | Wife | — | Poland |
| 15 | Edward Ostapko | 27 | Son | Fireman | New Jersey |
| 16 | Josephine Ostapko | 15 | Daughter | — | New Jersey |
| 17 | Joseph Ostapko | 15 | Son | — | New Jersey |
| 18 | John (X) Dempsey THIS PERSON | 28 | Head | Laborer | New Jersey |
| 19 | Agnes Dempsey | 32 | Wife | — | New Jersey |
| 20 | Margaret Dempsey | 5 | Daughter | — | New Jersey |
| 21 | James Smith | 32 | Head | Laborer | New Jersey |
| 22 | Sally (X) Smith | 27 | Wife | — | New Jersey |
| 23 | Patricia Smith | 4 | Daughter | — | New Jersey |
| 24 | Madeline Smith | 1 | Daughter | — | New Jersey |
| 25 | Philip (X) Woszczyllo | 61 | Head | — | Poland |
| 26 | Frances Woszczyllo | 53 | Wife | — | Maryland |
| 27 | Lottie Sobolewski | 26 | Daughter | — | New Jersey |
| 28 | Robert Sobolewski | 7 | Grandson | — | New Jersey |
| 29 | Chester Sobolewski | 6 | Grandson | — | New Jersey |
| 30 | Paul Bojarski | 42 | Lodger | Laborer | Poland |
| 31 | Dominick (X) Skrocki | 47 | Lodger | Laborer | Poland |
| 32 | Mary Bush | 57 | Head | — | Poland |
| 33 | Chester (X) Siegelski | 58 | Head | Car Cleaner | Poland |
| 34 | Nancy Bacinski | 29 | Niece | — | New Jersey |
| 35 | Eugene Bacinski | 14 | Nephew | — | New Jersey |
| 36 | Harry Kachinski | 45 | Head | Laborer | Poland |
| 37 | Jadwiga (X) Kachinski | 47 | Wife | — | Poland |
| 38 | Sophie Kachinski | 21 | Daughter | Machine Operator | New Jersey |
| 39 | Mary (X) Lesobey | 45 | Head | Charwoman | Austria |
| 40 | Anne Lesobey | 22 | Daughter | Packer | New Jersey |
Pedigree Summary
John
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)