WF
William Frederick — 1940 US Census Record
Model Tree available1940 United States Federal Census · Jefferson-County, Kentucky
Our Model Tree links this William Frederick across the 1920, 1930 and 1940 US Censuses in Jefferson-County, Kentucky (XGBoost, ~Confirmed), with identified parents Aloysius — 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 | Jefferson-County, Kentucky |
| Surname | Frederick |
| Given Name | William J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 33 |
| Marital Status | Married |
| Birthplace | Kentucky |
| 1935 Residence (City) | Louisville City |
| 1935 Residence (County) | Jefferson |
| Additional Details | |
| Occupation | truck driver |
| Industry | transfer Co. |
| Class of Worker | PW |
| Hours Worked | 33 |
| Income (1939) | 1800 |
| Highest Grade | No 5 |
| 1935 Residence | Same house |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
| Occupation | Truck Driver |
| Township / Ward | Louisville City |
| 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 William | Age | Birth yr |
|---|---|---|---|---|
| Charles Frederick | Son | — | 2 | ~1938 |
| Mary Frederick | Spouse | — | 30 | ~1910 |
| James Frederick | Son | — | 5 | ~1935 |
| William Frederick | Head | — | 33 | ~1907 |
| William Frederick | Son | — | 6 | ~1934 |
Census Appearances
1920
Jefferson, Kentucky
Son, age 12
Jefferson, Kentucky · implied b. ~1908 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Frederick |
| Given Name | William J |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Kentucky |
| Father's Birthplace | Kentucky |
| 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
Jefferson, Kentucky
Son, age 22
Jefferson, Kentucky · implied b. ~1908 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Frederick |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Kentucky |
| Father's Birthplace | Kentucky |
| Mother's Birthplace | Kentucky |
| Occupation | Checker |
| Industry | Retail Grocery |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
1940
Jefferson-County, Kentucky
Head, age 33
Jefferson-County, Kentucky · implied b. ~1907 — 5 household members
| Surname | Frederick |
| Given Name | William J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 33 |
| Marital Status | Married |
| Birthplace | Kentucky |
| 1935 Residence (City) | Louisville City |
| 1935 Residence (County) | Jefferson |
| Occupation | truck driver |
| Industry | transfer Co. |
| Class of Worker | PW |
| Hours Worked | 33 |
| Income (1939) | 1800 |
| Highest Grade | No 5 |
| 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 Frederick across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Aloysius Frederick (~0.92 confidence). The pedigree spans 1 generation with 1 identified ancestor.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Aloysius Frederick
b. ~1874
Source father
● Household
· direct · ~0.92
This person
Anchor record
William Frederick
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 — 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-t0627-01373-00241)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Doris Kallson | 6 | Daughter | — | Kentucky |
| 42 | Raymond E. Barnett | 41 | Head | Miscellaneous | Kentucky |
| 43 | Elizabeth Barnett | 41 | Wife | — | Kentucky |
| 44 | Raymond H. Barnett | 9 | Son | — | Kentucky |
| 45 | Ira Whitworth | 49 | Head | Hammer Helper | Kentucky |
| 46 | Pearl Whitworth | 41 | Wife | — | Kentucky |
| 47 | Louisa Whitworth | 18 | Daughter | — | Kentucky |
| 48 | Geneva Whitworth | 15 | Daughter | — | Kentucky |
| 49 | Eunice Whitworth | 12 | Daughter | — | Kentucky |
| 50 | Corbett Ammons | 44 | Brother-in-law | — | Kentucky |
| 51 | William J. Frederick THIS PERSON | 33 | Head | Truck Driver | Kentucky |
| 52 | Mary Frederick | 30 | Wife | — | Kentucky |
| 53 | William Frederick | 6 | Son | — | Kentucky |
| 54 | James Frederick | 5 | Son | — | Kentucky |
| 55 | Charles Frederick | 2 | Son | — | Kentucky |
| 56 | Almira Spratt | 37 | Head | Packer | Kentucky |
| 57 | Walter Spratt | 18 | Son | Stone Mason | Kentucky |
| 58 | John Spratt | 12 | Son | — | Kentucky |
| 59 | John C. Carroll | 62 | Father | Plumber | Kentucky |
| 60 | Mike Bush | 28 | Head | Board Tester | Kentucky |
| 61 | Emma Bush | 23 | Wife | — | Kentucky |
| 62 | Debra Fisher | 20 | Sister-in-law | Hand Labeler | Kentucky |
| 63 | Sidney Allen | 22 | Head | Dough Mixer | Kentucky |
| 64 | Evelyn Allen | 21 | Wife | Pastry Maker | Kentucky |
| 65 | Zelma Dunn | 29 | Head | Wrapper Folder | Kentucky |
| 66 | Doris D. Dodson | 12 | Daughter | — | Kentucky |
| 67 | Marie Faith | 69 | Lodger | — | Kentucky |
| 68 | Mary M. Hollin | 31 | Lodger | Printing Department | Kentucky |
| 69 | Raymond Zipper | 27 | Head | Supply Man | Kentucky |
| 70 | Alice Zipper | 24 | Wife | — | Kentucky |
| 71 | Yvonne Zipper | 5 | Daughter | — | Kentucky |
| 72 | Carl Leach | 32 | Lodger | Stocco Outer Man | Kentucky |
| 73 | Agnes Leach | 26 | Lodger | Machine Operator | Kentucky |
| 74 | Leon Yeater | 35 | Head | Checker | Kentucky |
| 75 | Gladys Yeater | 35 | Wife | Winder | Kentucky |
| 76 | Zilpha Payne | 52 | Head | — | Kentucky |
| 77 | Joseph Payne | 30 | Son | Plumber | Kentucky |
| 78 | John Lynch | 24 | Nephew | Plumber Helper | Missouri |
| 79 | Arthur Carter | 30 | Head | Night Watchman | Kentucky |
| 80 | Alma Carter | 26 | Wife | — | Kentucky |
Pedigree Summary
William
Gen 1 · 1 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)