JL
John Larkin — 1940 US Census Record
Model Tree available1940 United States Federal Census · Jefferson-County, Kentucky
Our Model Tree links this John Larkin across the 1920, 1930 and 1940 US Censuses in Jefferson-County, Kentucky (XGBoost, ~Confirmed), with identified parents John & John — first a son (b.~1904), then head of a 5-person household.
Age 36
b. ~1904
Male
Son
Born: Kentucky
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Jefferson-County, Kentucky |
| Surname | Larkin |
| Given Name | John E. Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 36 |
| Marital Status | Single |
| Birthplace | Kentucky |
| 1935 Residence (City) | Louisville City |
| 1935 Residence (County) | Jefferson |
| Additional Details | |
| Occupation | Clerk |
| Industry | Steam Rail Road |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1896 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
| Occupation | Clerk |
| Township / Ward | Louisville City |
| Est. Birth Year | ~1904 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Viola Larkin | Daughter | — | 37 | ~1903 |
| Martha Larkin | Daughter | — | 34 | ~1906 |
| John Larkin | Head | — | 62 | ~1878 |
| John Larkin | Son | — | 36 | ~1904 |
| Bertha Larkin | Spouse | — | 58 | ~1882 |
Census Appearances
1920
Jefferson, Kentucky
Son, age 15
Jefferson, Kentucky · implied b. ~1905 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Larkin |
| Given Name | John |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Kentucky |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Kentucky |
| Occupation | Stenographer |
| Industry | Fire Co |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
1930
Jefferson, Kentucky
Son, age 25
Jefferson, Kentucky · implied b. ~1905 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Larkin |
| Given Name | John E |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Kentucky |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Kentucky |
| Occupation | Clerk |
| Industry | Railroad Co |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
1940
Jefferson-County, Kentucky
Son, age 36
Jefferson-County, Kentucky · implied b. ~1904 — 5 household members
| Surname | Larkin |
| Given Name | John E. Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 36 |
| Marital Status | Single |
| Birthplace | Kentucky |
| 1935 Residence (City) | Louisville City |
| 1935 Residence (County) | Jefferson |
| Occupation | Clerk |
| Industry | Steam Rail Road |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1896 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| 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 Larkin across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Larkin (~0.92 confidence) and father John Larkin (~0.92 confidence) and mother Bertha Larkin (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Larkin
b. ~1878
Source father
● Household
· direct · ~0.92
Father
John Larkin
b. ~1881
Source father
● Household
· direct · ~0.92
Mother
Bertha Larkin
b. ~1882
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Larkin
Son · 1940 · age 36 · b. ~1904 · Kentucky
★ You are viewing this record
Sibling
Martha Larkin
Sibling · 1940 · age 34
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Viola Larkin
Sibling · 1940 · age 37
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-t0627-01376-00324)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Nancy Green | 13 | Daughter | — | Ohio |
| 2 | Ervin Schwarberg | 42 | Head | Secretary | Ohio |
| 3 | Louise Schwarberg | 37 | Wife | — | Ohio |
| 4 | James Schwarberg | 11 | Son | — | Kentucky |
| 5 | John E. Sr. Larkin | 62 | Head | Freight Clerk | Illinois |
| 6 | Bertha J. Larkin | 58 | Wife | — | Kentucky |
| 7 | Viola M. Larkin | 37 | Daughter | Clerk | Kentucky |
| 8 | John E. Jr. Larkin THIS PERSON | 36 | Son | Clerk | Kentucky |
| 9 | Martha L. Larkin | 34 | Daughter | — | Kentucky |
| 10 | William H. Fisher | 63 | Head | Engine Foreman | Indiana |
| 11 | Lillian Fisher | 58 | Wife | — | Kentucky |
| 12 | Ione Hamilton | 22 | Niece | — | Illinois |
| 13 | William H. King | 49 | Friend | Mechanic | Ohio |
| 14 | Joseph E. Sr. Pfeiffer | 49 | Head | Building Engineer | Kentucky |
| 15 | Lola Pfeiffer | 33 | Wife | — | Kentucky |
| 16 | Ethel L. Pfeiffer | 27 | Daughter | Junior Bookkeeper | Kentucky |
| 17 | Joseph E. Jr. Pfeiffer | 17 | Son | — | Kentucky |
| 18 | — | None | — | — | — |
| 19 | Coy M. Poole | 55 | Head | — | Kentucky |
| 20 | Walter George Poole | 56 | Brother-in-law | — | Kentucky |
| 21 | Ross Harris | 62 | Head | Helper | Indiana |
| 22 | Clara L. Harris | 62 | Wife | — | Indiana |
| 23 | John C. Harris | 27 | Son | Bookkeeper | Indiana |
| 24 | Charles A. Sr. Gathof | 40 | Head | Upholsterer | Kentucky |
| 25 | Elizabeth Gathof | 39 | Wife | — | Kentucky |
| 26 | Charles A. Jr. Gathof | 9 | Son | — | Kentucky |
| 27 | Elizabeth Ann Gathof | 8 | Daughter | — | Kentucky |
| 28 | Maurice H. Gathof | 2 | Son | — | Kentucky |
| 29 | Peter Kalme | 32 | Head | Mathematics Teacher | Virginia |
| 30 | Virginia Kalme | 32 | Wife | — | Virginia |
| 31 | Frances Kalme | 4 | Daughter | — | Kentucky |
| 32 | Shirley Kalme | 2 | Daughter | — | Kentucky |
| 33 | Nathaniel Campbell | 58 | Head | Clothing Salesman | Kentucky |
| 34 | Clara Campbell | 45 | Wife | — | Kentucky |
| 35 | Nathaniel Jr. Campbell | 21 | Son | Body Filler | Kentucky |
| 36 | Eileen Campbell | 19 | Daughter | — | Kentucky |
| 37 | Harlan Watkins | 59 | Head | Sawyer | Kentucky |
| 38 | Hessie Watkins | 55 | Wife | — | Kentucky |
| 39 | Martha Watkins | 29 | Daughter | Bookkeeper | Kentucky |
| 40 | Annie Watkins | 79 | Mother-in-law | — | Kentucky |
Pedigree Summary
John + 2 siblings
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)