MU
Mary Underwood — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Jefferson-County, Kentucky
Our Model Tree links this Mary Underwood across the 1930 and 1940 US Censuses in Jefferson-County, Kentucky (XGBoost, ~Confirmed) — first a daughter (b.~1920), then head of a 12-person household.
Age 20
b. ~1920
Female
Daughter
Born: Kentucky
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Jefferson-County, Kentucky |
| Surname | Underwood |
| Given Name | Mary Louise |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Kentucky |
| 1935 Residence (City) | Louisville City |
| 1935 Residence (County) | Jefferson |
| Additional Details | |
| Occupation | Library Assistant |
| Industry | Public Library |
| Class of Worker | PW |
| Hours Worked | 42 |
| Income (1939) | 246 |
| Highest Grade | H 4 |
| 1935 Residence | Same Place |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
| Occupation | Library Assistant |
| Township / Ward | Louisville City |
| Est. Birth Year | ~1920 |
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.
12 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Robert Underwood | Son | — | 11 | ~1929 |
| Eugene Underwood | Head | — | 54 | ~1886 |
| Ann Underwood | Daughter | — | 4 | ~1936 |
| Thomas Underwood | Son | — | 8 | ~1932 |
| Mary Underwood | Daughter | — | 20 | ~1920 |
| Amanda Underwood | Spouse | — | 41 | ~1899 |
| Marvin Underwood | Son | — | 9 | ~1931 |
| Marjorie Underwood | Daughter | — | 6 | ~1934 |
| Richard Underwood | Son | — | 12 | ~1928 |
| Helen Underwood | Daughter | — | 15 | ~1925 |
| Emma Underwood | Daughter | — | 16 | ~1924 |
| Eliza Underwood | Daughter | — | 19 | ~1921 |
Census Appearances
1930
Jefferson, Kentucky
Other, age 11
Jefferson, Kentucky · implied b. ~1919 — 50 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Underwood |
| Given Name | Mary L. |
| Relationship to Head | ward |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Kentucky |
| Father's Birthplace | United States |
| Mother's Birthplace | United States |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
1940
Jefferson-County, Kentucky
Daughter, age 20
Jefferson-County, Kentucky · implied b. ~1920 — 12 household members
| Surname | Underwood |
| Given Name | Mary Louise |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Kentucky |
| 1935 Residence (City) | Louisville City |
| 1935 Residence (County) | Jefferson |
| Occupation | Library Assistant |
| Industry | Public Library |
| Class of Worker | PW |
| Hours Worked | 42 |
| Income (1939) | 246 |
| 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 Mary Underwood across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Underwood
Daughter · 1940 · age 20 · b. ~1920 · Kentucky
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Sibling
Robert Underwood
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eliza Underwood
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Underwood
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Richard Underwood
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marjorie Underwood
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Emma Underwood
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ann Underwood
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Underwood
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marvin Underwood
Sibling · 1940 · age 9
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-t0627-01376-00072)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Calvin Robertson | 33 | Head | Truck Driver | Indiana |
| 2 | Mildred Robertson | 27 | Wife | — | Kentucky |
| 3 | Richard Pruett | 22 | Brother-in-law | Truck Driver | Kentucky |
| 4 | William T. Pruett | 16 | Brother-in-law | Farm Hand | Kentucky |
| 5 | Eugene C. Underwood | 54 | Head | Physician | Kentucky |
| 6 | Amanda Underwood | 41 | Wife | — | Kentucky |
| 7 | Mary Louise Underwood THIS PERSON | 20 | Daughter | Library Assistant | Kentucky |
| 8 | Eliza J. Underwood | 19 | Daughter | Private Secretary | Kentucky |
| 9 | Emma Underwood | 16 | Daughter | Library Assistant | Kentucky |
| 10 | Helen L. Underwood | 15 | Daughter | — | Kentucky |
| 11 | Richard Underwood | 12 | Son | — | Kentucky |
| 12 | Robert Lee Underwood | 11 | Son | — | Kentucky |
| 13 | Marvin S. Underwood | 9 | Son | — | Kentucky |
| 14 | Thomas L. Underwood | 8 | Son | — | Kentucky |
| 15 | Marjorie Underwood | 6 | Daughter | — | Kentucky |
| 16 | Ann Underwood | 4 | Daughter | — | Kentucky |
| 17 | Lawrence G. Gognat | 41 | Head | Laborer | Indiana |
| 18 | Lucy Gognat | 41 | Wife | — | Illinois |
| 19 | Charles Gognat | 16 | Son | — | Kentucky |
| 20 | Mary Ruth Gognat | 14 | Daughter | — | Kentucky |
| 21 | Ethel M. Gognat | 12 | Daughter | — | Kentucky |
| 22 | John R. Gognat | 11 | Son | — | Kentucky |
| 23 | Catherine Gognat | 8 | Daughter | — | Kentucky |
| 24 | Lawrence Jr. Gognat | 6 | Son | — | Kentucky |
| 25 | William Gognat | 5 | Son | — | Kentucky |
| 26 | Emma Mae Gognat | 3 | Daughter | — | Kentucky |
| 27 | William R. Campbell | 46 | Head | Tabulating Clerk | Kentucky |
| 28 | Catherine Campbell | 41 | Wife | — | Kentucky |
| 29 | James L. Campbell | 15 | Son | — | Kentucky |
| 30 | George Campbell | 11 | Son | — | Kentucky |
| 31 | Ben Campbell | 6 | Son | — | Kentucky |
| 32 | George L. Thacker | 70 | Roomer | — | Kentucky |
| 33 | Phillip Hindgen | 38 | Head | Truck Driver | Kentucky |
| 34 | Viola Hindgen | 39 | Wife | — | Kentucky |
| 35 | Elizabeth Hindgen | 12 | Daughter | — | Kentucky |
| 36 | Katie Jones | 66 | Mother-in-law | — | Kentucky |
| 37 | Leonard T. Durr | 44 | Head | Locomotive Engineer | Kentucky |
| 38 | Edith J. Durr | 39 | Wife | — | Kentucky |
| 39 | Emma Martin | 68 | Head | — | Indiana |
| 40 | Ruby Martin | 27 | Daughter | Saleslady | 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)