JW
John Wolf — 1940 US Census Record
Model Tree available1940 United States Federal Census · Campbell-County, Kentucky
Our Model Tree links this John Wolf across the 1910, 1920, 1930 and 1940 US Censuses in Campbell-County, Kentucky (XGBoost, ~Confirmed), with identified parents Margaret & Jacob — first a head (b.~1907), then head of a 5-person household.
Age 33
b. ~1907
Male
Head
Born: Kentucky
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Campbell-County, Kentucky |
| Surname | Wolf |
| Given Name | John G |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 33 |
| Marital Status | Married |
| Birthplace | Kentucky |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Campbell |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 60 |
| Income (1939) | 1200 |
| Highest Grade | No 8 |
| 1935 Residence | Kentucky |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
| Occupation | Farmer |
| Township / Ward | Magist Dist 7 Grants Lick |
| Est. Birth Year | ~1907 |
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 |
|---|---|---|---|---|
| Janet Wolf | Daughter | — | 7 | ~1933 |
| John Wolf | Head | — | 33 | ~1907 |
| John Wolf | Son | — | 4 | ~1936 |
| George Wolf | Son | — | 10 | ~1930 |
| Eula Wolf | Spouse | — | 34 | ~1906 |
Census Appearances
1910
Campbell, Kentucky
Son, age 4
Campbell, Kentucky · implied b. ~1906 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Wolf |
| Given Name | John J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Kentucky |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Kentucky |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
1920
Campbell, Kentucky
Son, age 13
Campbell, Kentucky · implied b. ~1907 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Wolf |
| Given Name | John J |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Kentucky |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Kentucky |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
1930
Campbell, Kentucky
Head, age 23
Campbell, Kentucky · implied b. ~1907
●
Primary link
· ~Confirmed · 1 source
XGBoost
| Surname | Wolf |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Married |
| Birthplace | Kentucky |
| Age at First Marriage | 23 |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Kentucky |
| Occupation | Farmer |
| Industry | Farming |
| Class of Worker | OA |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 10 |
| Radio Set | R |
| Veteran | No |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
1940
Campbell-County, Kentucky
Head, age 33
Campbell-County, Kentucky · implied b. ~1907 — 5 household members
| Surname | Wolf |
| Given Name | John G |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 33 |
| Marital Status | Married |
| Birthplace | Kentucky |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Campbell |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 60 |
| Income (1939) | 1200 |
| Highest Grade | No 8 |
| 1935 Residence | Kentucky |
| 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 Wolf across 4 US Census years (1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Margaret Wolf (~0.92 confidence) and father Jacob Wolf (~0.92 confidence) and father John Wolf (~0.92 confidence) and mother Elizabeth Wolf (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Margaret Wolf
b. ~1862
Source mother
● Household
· direct · ~0.92
Father
Jacob Wolf
b. ~1865
Source father
● Household
· direct · ~0.92
Father
John Wolf
b. ~1877
Source father
● Household
· direct · ~0.92
Mother
Elizabeth Wolf
b. ~1877
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Wolf
Head · 1940 · age 33 · b. ~1907 · Kentucky
★ 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 — Campbell-County, Kentucky
Open full size
1940 US Federal Census — Campbell-County, Kentucky
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01290-01103)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Fred Trapp | 35 | Head | Farmer | Ky |
| 2 | Louise Trapp | 37 | Wife | — | Ky |
| 3 | James Trapp | 8 | Son | — | Ky |
| 4 | Doris Trapp | 7 | Daughter | — | Ky |
| 5 | William Trapp | 5 | Son | — | Ky |
| 6 | Robert Trapp | 5 | Son | — | Ky |
| 7 | Nancy Trapp | 4 | Daughter | — | Ky |
| 8 | Dona Trapp | 2 | Daughter | — | Ky |
| 9 | George Schaefer | 71 | Head | Farmer | Ky |
| 10 | George Jr Schaefer | 26 | Nephew | Farmer | Ky |
| 11 | John Klindenback | 79 | Lodger | Farmer | Ky |
| 12 | Daniel S Halterman | 81 | Head | Farmer | Ky |
| 13 | John W Drake | 44 | Soninlaw | Farmer | Ky |
| 14 | Anna Drake | 43 | Daughter | — | Ky |
| 15 | James Vater | 41 | Head | Farmer | Ky |
| 16 | Mildred Vater | 40 | Wife | — | Ky |
| 17 | Helen Vater | 18 | Daughter | — | Ky |
| 18 | James Jr Vater | 14 | Son | — | Ky |
| 19 | Mathias G Machinat | 47 | Head | 26 | Ohio |
| 20 | Olga Machinat | 48 | Wife | — | Ohio |
| 21 | Marie Machinat | 21 | Daughter | Maid | Ky |
| 22 | Rosemary Machinat | 17 | Daughter | — | Ky |
| 23 | Fred Machinat | 25 | Son | Painter | Ky |
| 24 | Elizabeth Machinat | 20 | Daughterinlaw | — | Ky |
| 25 | Mary Lou Machinat | 3 | Granddaughter | — | Ky |
| 26 | Fred Machinat | 1 | Grandson | — | Ky |
| 27 | Ben S Johnston | 50 | Head | Farmer | Ky |
| 28 | Iva Johnston | 59 | Wife | — | Ky |
| 29 | Walter Johnston | 24 | Son | Farmer | Ky |
| 30 | Dotty Johnston | 26 | Daughterinlaw | — | Ky |
| 31 | William Johnston | 4 | Grandson | — | Ky |
| 32 | Ben Johnston | 1 | Grandson | — | Ky |
| 33 | John G Wolf THIS PERSON | 33 | Head | Farmer | Kentucky |
| 34 | Eula Wolf | 34 | Wife | — | Kentucky |
| 35 | George Wolf | 10 | Son | — | Kentucky |
| 36 | Janet Wolf | 7 | Daughter | — | Kentucky |
| 37 | John Arnold Wolf | 4 | Son | — | Kentucky |
| 38 | W. A. Britton | 46 | Head | Farmer | Kentucky |
| 39 | Marie Britton | 45 | Wife | — | Kentucky |
| 40 | Alta Britton | 18 | Daughter | — | Kentucky |
Pedigree Summary
John
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)