WD
William Duffy — 1940 US Census Record
Model Tree available1940 United States Federal Census · Jefferson-County, Kentucky
Our Model Tree links this William Duffy across the 1920, 1930 and 1940 US Censuses in Jefferson-County, Kentucky (XGBoost, ~Confirmed), with identified parents John & Eleonora — first a son (b.~1916), then head of a 4-person household.
Age 24
b. ~1916
Male
Son
Born: Kentucky
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Jefferson-County, Kentucky |
| Surname | Duffy |
| Given Name | William |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Kentucky |
| 1935 Residence (City) | Louisville City |
| 1935 Residence (County) | Jefferson |
| Additional Details | |
| Occupation | bookkeeper |
| Industry | dye works |
| Class of Worker | PW |
| Hours Worked | 8 |
| Income (1939) | 210 |
| Highest Grade | H 4 |
| 1935 Residence | Same house |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
| Occupation | Bookkeeper |
| Township / Ward | Louisville City |
| Est. Birth Year | ~1916 |
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 William | Age | Birth yr |
|---|---|---|---|---|
| Harry Duffy | Son | — | 22 | ~1918 |
| William Duffy | Son | — | 24 | ~1916 |
| Mary Duffy | Head | — | 51 | ~1889 |
| Norman Duffy | Son | — | 28 | ~1912 |
Census Appearances
1920
Jefferson, Kentucky
Son, age 4
Jefferson, Kentucky · implied b. ~1916 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffy |
| Given Name | William E |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 4 |
| 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 |
1930
Jefferson, Kentucky
Son, age 14
Jefferson, Kentucky · implied b. ~1916 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffy |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Kentucky |
| Father's Birthplace | Kentucky |
| Mother's Birthplace | Kentucky |
| Can Read/Write | Yes |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
1940
Jefferson-County, Kentucky
Son, age 24
Jefferson-County, Kentucky · implied b. ~1916 — 4 household members
| Surname | Duffy |
| Given Name | William |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Kentucky |
| 1935 Residence (City) | Louisville City |
| 1935 Residence (County) | Jefferson |
| Occupation | bookkeeper |
| Industry | dye works |
| Class of Worker | PW |
| Hours Worked | 8 |
| Income (1939) | 210 |
| Highest Grade | H 4 |
| 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 William Duffy across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Duffy (~0.92 confidence) and mother Eleonora Duffy (~0.92 confidence) and mother Mary Duffy (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Duffy
b. ~1879
Source father
● Household
· direct · ~0.92
Mother
Eleonora Duffy
b. ~1885
Source mother
● Household
· direct · ~0.92
Mother
Mary Duffy
b. ~1889
Source mother
● Household
· direct · ~0.92
This person
Anchor record
William Duffy
Son · 1940 · age 24 · b. ~1916 · Kentucky
★ You are viewing this record
Sibling
Harry Duffy
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Norman Duffy
Sibling · 1940 · age 28
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-t0627-01374-00028)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Mary C Mahoney | 5 | daughter | — | Kentucky |
| 2 | John M Jr Mahoney | 0 | son | — | Kentucky |
| 3 | Sadie Patton | 61 | head | — | Kentucky |
| 4 | Sadie Patton | 31 | daughter | Beautician | Kentucky |
| 5 | Mary Duffy | 51 | head | — | Kentucky |
| 6 | Norman Duffy | 28 | son | Clerk | Kentucky |
| 7 | William Duffy THIS PERSON | 24 | son | Bookkeeper | Kentucky |
| 8 | Harry Duffy | 22 | son | Typist | Kentucky |
| 9 | George Trager | 37 | head | Chief Deputy | Kentucky |
| 10 | Gladys Trager | 37 | wife | — | Kentucky |
| 11 | John D Trager | 2 | son | — | Kentucky |
| 12 | Arthur C Pfeiffer | 35 | head | Laborer | Kentucky |
| 13 | Catherine Pfeiffer | 29 | wife | — | Kentucky |
| 14 | Eugene Pfeiffer | 5 | son | — | Kentucky |
| 15 | Mary Pfeiffer | 1 | daughter | — | Kentucky |
| 16 | Elizabeth Manger | 30 | head | — | Kentucky |
| 17 | Frank Manger | 13 | son | — | Kentucky |
| 18 | Charles Manger | 11 | son | — | Kentucky |
| 19 | Betty Manger | 9 | daughter | — | Kentucky |
| 20 | Marilyn Manger | 7 | daughter | — | Kentucky |
| 21 | Florence O'Riely | 70 | aunt | — | Kentucky |
| 22 | Joseph Winsor | 41 | head | Fireman | Kentucky |
| 23 | Ethel Winsor | 30 | wife | — | Kentucky |
| 24 | Estellene Winsor | 11 | daughter | — | Kentucky |
| 25 | Peggy Winsor | 10 | daughter | — | Kentucky |
| 26 | Ethel Winsor | 8 | daughter | — | Kentucky |
| 27 | William Winsor | 4 | son | — | Kentucky |
| 28 | Bruce Lee Winsor | 3 | son | — | Kentucky |
| 29 | Elmer G Wood | 38 | head | Polisher | Kentucky |
| 30 | Margaret Wood | 41 | wife | — | Kentucky |
| 31 | John Wood | 4 | daughter | — | Kentucky |
| 32 | Charles J Remfer | 55 | head | Stationary Fireman | Kentucky |
| 33 | Francis Remfer | 50 | wife | — | Kentucky |
| 34 | John F Remfer | 21 | son | Clerk | Kentucky |
| 35 | Edward L Remfer | 16 | son | — | Kentucky |
| 36 | Frank Remfer | 14 | son | — | Kentucky |
| 37 | William L Remfer | 31 | son | Painter | Kentucky |
| 38 | Catherine Gibson | 55 | head | — | Kentucky |
| 39 | David Bennett | 34 | head | Packer | Kentucky |
| 40 | Catherine Bennett | 29 | wife | — | Kentucky |
Pedigree Summary
William + 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)