JH
John Hart — 1940 US Census Record
Model Tree available1940 United States Federal Census · St.-Clair-County, Michigan
Our Model Tree links this John Hart across the 1920, 1930 and 1940 US Censuses in St.-Clair-County, Michigan (XGBoost, ~Confirmed), with identified parents Edward & Edmund — first a son (b.~1908), then head of a 4-person household.
Age 32
b. ~1908
Male
Son
Born: Michigan
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | St.-Clair-County, Michigan |
| Surname | Hart |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 32 |
| Marital Status | Married |
| Birthplace | Michigan |
| 1935 Residence (City) | St. Clair City |
| 1935 Residence (County) | St. Clair |
| Additional Details | |
| Occupation | Clerk |
| Industry | Hdwe Store |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 750 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same house |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
| Occupation | Clerk |
| Township / Ward | St Clair City |
| Est. Birth Year | ~1908 |
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 |
|---|---|---|---|---|
| Edmund Hart | Head | — | 70 | ~1870 |
| Janice Hart | Other | — | 3 | ~1937 |
| Annetta Hart | Other | — | 28 | ~1912 |
| John Hart | Son | — | 32 | ~1908 |
Census Appearances
1920
St Clair, …
Son, age 12
St Clair, Michigan · implied b. ~1908 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hart |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Michigan |
| Father's Birthplace | Michigan |
| Mother's Birthplace | Michigan |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
1930
St Clair, …
Son, age 23
St Clair, Michigan · implied b. ~1907 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hart |
| Given Name | John H. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Michigan |
| Father's Birthplace | Michigan |
| Mother's Birthplace | Michigan |
| Occupation | salesman |
| Industry | hardware |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
1940
St.-Clair-County, Michigan
Son, age 32
St.-Clair-County, Michigan · implied b. ~1908 — 4 household members
| Surname | Hart |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 32 |
| Marital Status | Married |
| Birthplace | Michigan |
| 1935 Residence (City) | St. Clair City |
| 1935 Residence (County) | St. Clair |
| Occupation | Clerk |
| Industry | Hdwe Store |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 750 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same house |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
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 Hart across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Edward Hart (~0.92 confidence) and father Edmund Hart (~0.92 confidence) and father Edmund Hart (~0.92 confidence) and mother Jean Hart (~0.92 confidence) and mother Jessie Hart (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Edward Hart
b. ~1870
Source father
● Household
· direct · ~0.92
Father
Edmund Hart
b. ~1870
Source father
● Household
· direct · ~0.92
Father
Edmund Hart
b. ~1870
Source father
● Household
· direct · ~0.92
Mother
Jean Hart
b. ~1870
Source mother
● Household
· direct · ~0.92
Mother
Jessie Hart
b. ~1872
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Hart
Son · 1940 · age 32 · b. ~1908 · Michigan
★ 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 — St.-Clair-County, Michigan
Open full size
1940 US Federal Census — St.-Clair-County, Michigan
Page Contents
35 people indexed on this census page (nara:1940:m-t0627-01816-00898)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Lucille Webster | 27 | Wife | — | Michigan |
| 42 | Samuel Webster | 6 | Son | — | Michigan |
| 43 | Mary Jane Webster | 2 | Daughter | — | Michigan |
| 44 | George Ely | 64 | Head | Tailor | Canada |
| 45 | Lillian Ely | 60 | Wife | — | Canada |
| 46 | James Miller | 23 | Head | Cabinet Maker | Michigan |
| 47 | Rosemonde Miller | 21 | Wife | — | Michigan |
| 48 | Charles Lerty | 83 | Head | — | Michigan |
| 49 | Martha Lerty | 66 | Wife | — | Michigan |
| 51 | Clyde R. Wilcox | 41 | Head | Clergyman | Michigan |
| 53 | Edmund Hart | 70 | Head | Proprietor | Michigan |
| 54 | John Hart THIS PERSON | 32 | Son | Clerk | Michigan |
| 55 | Annetta Hart | 28 | Daughter-in-law | — | Michigan |
| 56 | Janice Hart | 3 | Grand-daughter | — | Michigan |
| 57 | Hugh H. Hart | 64 | Head | Lawyer | Michigan |
| 58 | Blanche Hart | 64 | Wife | — | Michigan |
| 59 | Laura Brown | 58 | Boarder | — | Michigan |
| 61 | Florence Elliott | 39 | Lodger | Office Girl | Canada |
| 62 | Doris Innis | 27 | Lodger | Teacher | Michigan |
| 63 | John Zimmer | 67 | Head | Caretaker | Michigan |
| 64 | Mary Zimmer | 58 | Wife | Boarding Children | Michigan |
| 65 | Frank Clark | 74 | Lodger | — | Michigan |
| 66 | Patsy Ream | 10 | Lodger | — | Michigan |
| 67 | Mary Moore | 65 | Lodger | — | Some place |
| 68 | Delores Moore | 4 | Lodger | — | Michigan |
| 69 | Wilber Twiss | 55 | Head | Pharmacist | Michigan |
| 70 | Elizabeth Twiss | 50 | Wife | — | Michigan |
| 72 | Edward Ross | 68 | Head | Proprietor | Michigan |
| 73 | Etta Ross | 66 | Wife | — | Michigan |
| 74 | Howard Martinger | 38 | Head | Mechanic | Michigan |
| 75 | Mabel Martinger | 34 | Wife | — | Michigan |
| 76 | Samuel Martinger | 80 | Father | — | Michigan |
| 77 | William Martinger | 13 | Son | — | Michigan |
| 78 | James Martinger | 12 | Son | — | Michigan |
| 79 | Mary Martinger | 10 | Daughter | — | Michigan |
Pedigree Summary
John
Gen 1 · 5 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)