JH
John Hartman — 1940 US Census Record
Model Tree available1940 United States Federal Census · Mercer-County, New Jersey
Our Model Tree links this John Hartman across the 1920, 1930 and 1940 US Censuses in Mercer-County, New Jersey (XGBoost, ~Confirmed), with identified parents Ada & Frank — first a son (b.~1916), then head of a 4-person household.
Age 24
b. ~1916
Male
Son
Born: New Jersey
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Mercer-County, New Jersey |
| Surname | Hartman |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | Trenton City |
| 1935 Residence (County) | Mercer |
| Additional Details | |
| Occupation | Salesman |
| Class of Worker | 366 |
| Hours Worked | 40 |
| Highest Grade | H-4 |
| 1935 Residence | Same House |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Occupation | Salesman |
| Township / Ward | Trenton City |
| Est. Birth Year | ~1916 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Verna Elliott | Daughter | — | 31 | ~1909 |
| Ada Hartman | Head | — | 56 | ~1884 |
| Elmer Elliott | Other | — | 37 | ~1903 |
| John Hartman | Son | — | 24 | ~1916 |
Census Appearances
1920
Mercer, New …
Son, age 4
Mercer, New Jersey · implied b. ~1916 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hartman |
| Given Name | John |
| 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 Jersey |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1930
Mercer, New …
Son, age 14
Mercer, New Jersey · implied b. ~1916 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hartmann |
| Given Name | John E. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | New Jersey |
| Mother's Birthplace | New Jersey |
| Can Read/Write | Yes |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1940
Mercer-County, New …
Son, age 24
Mercer-County, New Jersey · implied b. ~1916 — 4 household members
| Surname | Hartman |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | Trenton City |
| 1935 Residence (County) | Mercer |
| Occupation | Salesman |
| Class of Worker | 366 |
| Hours Worked | 40 |
| Highest Grade | H-4 |
| 1935 Residence | Same House |
| 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 Hartman across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Ada Hartman (~0.92 confidence) and father Frank Hartman (~0.92 confidence) and father Harry Hartmann (~0.92 confidence) and mother Margaret Hartman (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Ada Hartman
b. ~1884
Source mother
● Household
· direct · ~0.92
Father
Frank Hartman
b. ~1885
Source father
● Household
· direct · ~0.92
Father
Harry Hartmann
b. ~1885
Source father
● Household
· direct · ~0.92
Mother
Margaret Hartman
b. ~1885
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Hartman
Son · 1940 · age 24 · b. ~1916 · New Jersey
★ You are viewing this record
Sibling
Verna Elliott
Sibling · 1940 · age 31
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 — Mercer-County, New Jersey
Open full size
1940 US Federal Census — Mercer-County, New Jersey
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02437-00511)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | William A Furman | 62 | Head | Ot | New Jersey |
| 2 | Lelia F Furman | 61 | Wife | — | New Jersey |
| 3 | Linwood F Furman | 27 | Son | Secretary | New Jersey |
| 4 | Richard F Furman | 22 | Son | — | New Jersey |
| 5 | Clarence Grant | 59 | Lodger | — | New Jersey |
| 6 | Frederick Nicholas | 18 | Lodger | Apprentice | New Jersey |
| 7 | George C Gardner | 27 | Head | Manager | New Jersey |
| 8 | Agatha Gardner | 24 | Wife | — | New Jersey |
| 9 | Solyanne Gardner | 2 | Daughter | — | New Jersey |
| 10 | Mclean John | 23 | Brother | Manufacturing Business | New Jersey |
| 11 | Helen M Morgan | 52 | Head | Clerk | New Jersey |
| 12 | William G Morgan | 27 | Son | Real Estate | New Jersey |
| 13 | Kathryn Z Morgan | 23 | Daughter | Milliner | New Jersey |
| 14 | Mary E Pickard | 53 | Lodger | Seamstress | New Jersey |
| 15 | Ada Hartman | 56 | Head | — | New Jersey |
| 16 | John Hartman THIS PERSON | 24 | Son | Salesman | New Jersey |
| 17 | Verna Elliott | 31 | Daughter | Stenographer | New Jersey |
| 18 | Elmer Elliott | 37 | Son-in-law | State Hospital Checker | New Jersey |
| 19 | Jeanette Haverstick | 48 | Head | Music Supervisor | New Jersey |
| 20 | Harriet Cunningham | 70 | Boarder | — | New Jersey |
| 21 | H Elizabeth | 57 | Sister | Artist | New Jersey |
| 22 | Elizabeth Elizabeth | 23 | Daughter | Student | New Jersey |
| 23 | George G Auer | 44 | Head | Doctor | New Jersey |
| 24 | Margaret F Auer | 41 | Wife | — | New Jersey |
| 25 | Margaret Auer | 19 | Daughter | — | New Jersey |
| 26 | Agnes Patrick | 18 | Housekeeper | — | New Jersey |
| 27 | L. D. Hardin | 29 | Head | Restaurant | New Jersey |
| 28 | Bertha Hardin | 24 | Wife | — | New Jersey |
| 29 | Nathan Harker | 32 | Head | — | New Jersey |
| 30 | Esther E Harker | 29 | Wife | — | New Jersey |
| 31 | Charles C Thompson | 54 | Head | Partner Business | New Jersey |
| 32 | Mary E Thompson | 33 | Wife | — | New Jersey |
| 33 | J. Carter Harris | 31 | Head | Teacher | New Jersey |
| 34 | Ethel Harris | 33 | Wife | — | New Jersey |
| 35 | Arthur Picknell | 43 | Head | Purchaser | New Jersey |
| 36 | Theresa Picknell | 40 | Wife | — | New Jersey |
| 37 | Jacob Picknell | 22 | Son | Tabulator | New Jersey |
| 38 | Joseph Picknell | 19 | Son | — | New Jersey |
| 39 | Amelia Picknell | 17 | Daughter | — | New Jersey |
| 40 | Nancy Picknell | 15 | Daughter | — | New Jersey |
Pedigree Summary
John + 1 sibling
Gen 1 · 4 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)