JH
John Hart — 1940 US Census Record
Model Tree available1940 United States Federal Census · Duval-County, Florida
Our Model Tree links this John Hart across the 1920, 1930 and 1940 US Censuses in Duval-County, Florida (XGBoost, ~Confirmed), with identified parents Stephen & Birdie — first a son (b.~1918), then head of a 4-person household.
Age 22
b. ~1918
Male
Son
Born: Florida
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Duval-County, Florida |
| Surname | Hart |
| Given Name | John S. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Florida |
| 1935 Residence (City) | Jacksonville |
| 1935 Residence (County) | Duval |
| Additional Details | |
| Occupation | Laborer |
| Industry | Express Co |
| Class of Worker | PW |
| Hours Worked | 42 |
| Income (1939) | 520 |
| Highest Grade | C 1 |
| 1935 Residence | Same house |
| Birth State | Florida |
| Birth Country | United States |
| Birthplace (normalized) | florida |
| Occupation | Laborer |
| Township / Ward | Jacksonville |
| Est. Birth Year | ~1918 |
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 |
|---|---|---|---|---|
| Steven Hart | Head | — | 49 | ~1891 |
| John Hart | Son | — | 22 | ~1918 |
| Henry Davis | Son | — | 8 | ~1932 |
| Alberta Hart | Spouse | — | 43 | ~1897 |
Census Appearances
1920
Duval, Florida
Son, age 5
Duval, Florida · implied b. ~1915 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hart |
| Given Name | Johnnie S. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Florida |
| Father's Birthplace | Florida |
| Mother's Birthplace | Florida |
| Occupation | none |
| Birth State | Florida |
| Birth Country | United States |
| Birthplace (normalized) | florida |
1930
Duval, Florida
Son, age 14
Duval, Florida · implied b. ~1916 — 42 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hart |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Florida |
| Father's Birthplace | Florida |
| Mother's Birthplace | Florida |
| Can Read/Write | Yes |
| Birth State | Florida |
| Birth Country | United States |
| Birthplace (normalized) | florida |
1940
Duval-County, Florida
Son, age 22
Duval-County, Florida · implied b. ~1918 — 4 household members
| Surname | Hart |
| Given Name | John S. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Florida |
| 1935 Residence (City) | Jacksonville |
| 1935 Residence (County) | Duval |
| Occupation | Laborer |
| Industry | Express Co |
| Class of Worker | PW |
| Hours Worked | 42 |
| Income (1939) | 520 |
| Highest Grade | C 1 |
| 1935 Residence | Same house |
| Birth State | Florida |
| Birth Country | United States |
| Birthplace (normalized) | florida |
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 Stephen Hart (~0.92 confidence) and mother Birdie Hart (~0.92 confidence) and mother Alberta Hart (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Stephen Hart
b. ~1888
Source father
● Household
· direct · ~0.92
Mother
Birdie Hart
b. ~1896
Source mother
● Household
· direct · ~0.92
Mother
Alberta Hart
b. ~1897
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Hart
Son · 1940 · age 22 · b. ~1918 · Florida
★ You are viewing this record
Sibling
Henry Davis
Sibling · 1940 · age 8
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 — Duval-County, Florida
Open full size
1940 US Federal Census — Duval-County, Florida
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-00626-00283)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Francis | 29 | Wife | Roller | Georgia |
| 43 | Bryant L. Mann | 34 | Head | — | Florida |
| 44 | Verdie Mann | 31 | Wife | Sewing | Georgia |
| 45 | Ophelia Mann | 9 | Daughter | — | Florida |
| 46 | William Mann | 7 | Son | — | Florida |
| 47 | Jennie Williams | 60 | Head | — | Georgia |
| 48 | George F. Sr. Reed | 50 | Head | Butcher | Florida |
| 49 | Ada Reed | 45 | Wife | Maid | Germany |
| 50 | George F. Jr. Reed | 24 | Son | Truck Driver | Florida |
| 51 | Virginia Reed | 20 | Daughter | — | Florida |
| 52 | Gertrude Reed | 18 | Daughter | — | Florida |
| 53 | Francis Reed | 16 | Son | — | Florida |
| 54 | Steven E. Hart | 49 | Head | Salesman | Florida |
| 55 | Alberta Hart | 43 | Wife | — | Florida |
| 56 | John S. Hart THIS PERSON | 22 | Son | Laborer | Florida |
| 57 | Henry W. Davis | 8 | Son | — | Florida |
| 58 | Washburn Ragan | 34 | Head | Interior Decorator | Georgia |
| 59 | Yvette Ragan | 31 | Wife | — | Florida |
| 60 | Patricia Ann Ragan | 7 | Daughter | — | Florida |
| 61 | Bruce H. Strickland | 27 | Head | Truck Driver | Georgia |
| 62 | Agile Strickland | 27 | Wife | Breaker | S. Carolina |
| 63 | Josephine Strickland | 7 | Daughter | — | Georgia |
| 64 | Albert Strickland | 2 | Son | — | Georgia |
| 65 | Maxie Marlon | 46 | Head | Carpenter | Georgia |
| 66 | Dona Bell Marlon | 39 | Wife | — | Georgia |
| 67 | Inez Marlon | 16 | Daughter | — | Florida |
| 68 | Lois Marlon | 14 | Daughter | — | Florida |
| 69 | Ashby Marlon | 13 | Son | — | Florida |
| 70 | Nettie Marlon | 9 | Daughter | — | Florida |
| 71 | Norman Marlon | 5 | Son | — | Florida |
| 72 | Erlene Marlon | 1 | Daughter | — | Florida |
| 73 | Edward E. Siler | 48 | Head | — | Missouri |
| 74 | Eulie A. Siler | 64 | Wife | — | Florida |
| 75 | John E. Frasier | 67 | Head | Timekeeper | Texas |
| 76 | Bessie M. Frasier | 54 | Wife | — | New York |
| 77 | Billie M. Frasier | 25 | Son | Machinist | Texas |
| 78 | Margie Frasier | 19 | Daughter-in-law | — | Georgia |
| 79 | Billie D. Frasier | 0 | Grandson | — | Florida |
| 80 | Jerome B. Wallace | 36 | Head | Clerk | Florida |
Pedigree Summary
John + 1 sibling
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)