JK
John Kaufman — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Jefferson-County, Kentucky
Our Model Tree links this John Kaufman across the 1930 and 1940 US Censuses in Jefferson-County, Kentucky (XGBoost, ~Confirmed) — first a son (b.~1924), then head of a 10-person household.
Age 16
b. ~1924
Male
Son
Born: Kentucky
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Jefferson-County, Kentucky |
| Surname | Kaufman |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Kentucky |
| 1935 Residence (City) | Louisville city |
| 1935 Residence (County) | Jefferson |
| Additional Details | |
| Highest Grade | No 8 |
| 1935 Residence | Same house |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
| Township / Ward | Louisville City |
| Est. Birth Year | ~1924 |
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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Leo Kaufman | Head | — | 47 | ~1893 |
| John Kaufman | Son | — | 16 | ~1924 |
| James Kaufman | Son | — | 12 | ~1928 |
| Mary Kaufman | Spouse | — | 46 | ~1894 |
| Frank Kaufman | Son | — | 24 | ~1916 |
| William Kaufman | Son | — | 20 | ~1920 |
| Elizabeth Kaufman | Daughter | — | 19 | ~1921 |
| Catherine Kaufman | Daughter | — | 12 | ~1928 |
| Herman Kaufman | Son | — | 18 | ~1922 |
| Geo Kaufman | Son | — | 26 | ~1914 |
Census Appearances
1930
Jefferson, Kentucky
Son, age 6
Jefferson, Kentucky · implied b. ~1924 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kaufman |
| Given Name | J. Alph |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Kentucky |
| Father's Birthplace | Kentucky |
| Mother's Birthplace | Kentucky |
| Occupation | none |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
1940
Jefferson-County, Kentucky
Son, age 16
Jefferson-County, Kentucky · implied b. ~1924 — 10 household members
| Surname | Kaufman |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Kentucky |
| 1935 Residence (City) | Louisville city |
| 1935 Residence (County) | Jefferson |
| Highest Grade | No 8 |
| 1935 Residence | Same house |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
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 Kaufman across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Kaufman
Son · 1940 · age 16 · b. ~1924 · Kentucky
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Sibling
Elizabeth Kaufman
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Geo Kaufman
Sibling · 1940 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frank Kaufman
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Kaufman
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Kaufman
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Herman Kaufman
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Kaufman
Sibling · 1940 · age 20
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 — Jefferson-County, Kentucky
Open full size
1940 US Federal Census — Jefferson-County, Kentucky
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01365-00448)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Amelia Strangway | 48 | Mother | Saleslady | Kentucky |
| 42 | Silas Steenbergen | 28 | Head | Laborer | Kentucky |
| 43 | Mildred Steenbergen | 24 | Wife | — | Kentucky |
| 44 | Leona Steenbergen | 7 | Daughter | — | Kentucky |
| 45 | Alma Steenbergen | 5 | Daughter | — | Kentucky |
| 46 | Shirley Steenbergen | 2 | Daughter | — | Kentucky |
| 47 | Blanton Wise | 55 | Head | Clerk | Kentucky |
| 48 | Catherine Wise | 52 | Wife | — | Missouri |
| 49 | John Antle | 35 | Head | Laborer | Kentucky |
| 50 | Beatrice Antle | 34 | Wife | — | Kentucky |
| 51 | Joseph Antle | 14 | Son | — | Kentucky |
| 52 | Cal Griitton | Gritton | 38 | Head | Truck Driver | Kentucky |
| 53 | Ray Griitton | Gritton | 25 | Wife | Laborer | Kentucky |
| 54 | Alma Griitton | Gritton | 8 | Daughter | — | Kentucky |
| 55 | Harlod | Harold Griitton | Gritton | 6 | Son | — | Kentucky |
| 56 | Mae Mattingly | 25 | Daughter | — | Kentucky |
| 57 | Rose Davis | 63 | Head | — | Indiana |
| 58 | Rose M. Davis | 21 | Daughter | Laborer | Kentucky |
| 59 | Montgery | Montgomery Nicklas | 23 | Head | Brick Layer | Kentucky |
| 60 | Mary Nicklas | 18 | Wife | — | Kentucky |
| 61 | Dorothy Nicklas | 0 | Daughter | — | Kentucky |
| 62 | Loranza Howard | 38 | Head | Laborer | Kentucky |
| 63 | Robert Frank | 12 | Brother | — | Kentucky |
| 64 | Howard Sutherland | 43 | Head | Laborer | Kentucky |
| 65 | Lennie Sutherland | 24 | Wife | Laborer | Kentucky |
| 66 | Charles Smith | 50 | Head | — | Kentucky |
| 67 | Dorothy Smith | 56 | Wife | — | Indiana |
| 68 | James Nibbel | 26 | Son | — | Kentucky |
| 69 | Myrtle Nibbel | 23 | Daughter-in-law | — | Kentucky |
| 70 | Ronald Nibbel | 3 | Grandson | — | Kentucky |
| 71 | Leo Kaufman | 47 | Head | Butcher | Kentucky |
| 72 | Mary Kaufman | 46 | Wife | — | Kentucky |
| 73 | Geo. H. Kaufman | 26 | Son | Truck Driver | Kentucky |
| 74 | Frank Kaufman | 24 | Son | Truck Driver | Kentucky |
| 75 | William Kaufman | 20 | Son | Truck Driver | Kentucky |
| 76 | Elizabeth Kaufman | 19 | Daughter | — | Kentucky |
| 77 | Herman Kaufman | 18 | Son | — | Kentucky |
| 78 | John Kaufman THIS PERSON | 16 | Son | — | Kentucky |
| 79 | James Kaufman | 12 | Son | — | Kentucky |
| 80 | Catherine Kaufman | 12 | Daughter | — | Kentucky |
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)