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Mary Mcelroy — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Marion-County, Kentucky
Our Model Tree links this Mary Mcelroy across the 1930 and 1940 US Censuses in Marion-County, Kentucky (XGBoost, ~Confirmed) — first a daughter (b.~1920), then head of a 8-person household.
Age 20
b. ~1920
Female
Daughter
Born: Kentucky
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Marion-County, Kentucky |
| Surname | McElroy |
| Given Name | Mary B. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Kentucky |
| 1935 Residence (City) | Lebanon City |
| 1935 Residence (County) | Marion |
| Additional Details | |
| Highest Grade | No 2 |
| 1935 Residence | Same place |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
| Township / Ward | Lebanon 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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Loulina Mcelroy | Daughter | — | 11 | ~1929 |
| Foster Mcelroy | Son | — | 8 | ~1932 |
| George Mcelroy | Head | — | 49 | ~1891 |
| Mary Mcelroy | Daughter | — | 20 | ~1920 |
| John Mcelroy | Son | — | 30 | ~1910 |
| Sara Mcelroy | Daughter | — | 4 | ~1936 |
| George Mcelroy | Son | — | 14 | ~1926 |
| Nellie Mcelroy | Spouse | — | 48 | ~1892 |
Census Appearances
1930
Marion, Kentucky
Daughter, age 9
Marion, Kentucky · implied b. ~1921 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McElroy |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 9 |
| 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
Marion-County, Kentucky
Daughter, age 20
Marion-County, Kentucky · implied b. ~1920 — 8 household members
| Surname | McElroy |
| Given Name | Mary B. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Kentucky |
| 1935 Residence (City) | Lebanon City |
| 1935 Residence (County) | Marion |
| Highest Grade | No 2 |
| 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 Mcelroy across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Mcelroy
Daughter · 1940 · age 20 · b. ~1920 · Kentucky
★ You are viewing this record
Sibling
George Mcelroy
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Loulina Mcelroy
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Sara Mcelroy
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Foster Mcelroy
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Mcelroy
Sibling · 1940 · age 30
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 — Marion-County, Kentucky
Open full size
1940 US Federal Census — Marion-County, Kentucky
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01338-00128)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Anna May Mcatee | 10 | Daughter | — | Kentucky |
| 2 | Henry Mcatee | 9 | Son | — | Kentucky |
| 3 | Margaret Mcatee | 6 | Daughter | — | Kentucky |
| 4 | Carla L. Mcatee | 5 | Daughter | — | Kentucky |
| 5 | Daisy Mcatee | 3 | Daughter | — | Kentucky |
| 6 | Joe W. Mcatee | 1 | Son | — | Kentucky |
| 7 | Benedict Haydon | 26 | Head | Janitor | Kentucky |
| 8 | Alma Haydon | 24 | Wife | Cook | Kentucky |
| 9 | Ida May Downs | 12 | Niece | — | Kentucky |
| 10 | George Mcelroy | 49 | Head | Gardener | Kentucky |
| 11 | Nellie Mcelroy | 48 | Wife | — | Kentucky |
| 12 | John L. Mcelroy | 30 | Son | Cook | Kentucky |
| 13 | Mary B. Mcelroy THIS PERSON | 20 | Daughter | — | Kentucky |
| 14 | George Jr. Mcelroy | 14 | Son | — | Kentucky |
| 15 | Loulina Mcelroy | 11 | Daughter | — | Kentucky |
| 16 | Foster Mcelroy | 8 | Son | — | Kentucky |
| 17 | Sara E. Mcelroy | 4 | Daughter | — | Kentucky |
| 18 | Mary A. Yates | 82 | Head | — | Kentucky |
| 19 | Mary Adams | 39 | Head | — | Kentucky |
| 20 | Raymond Adams | 42 | Brother | Truck Driver | Kentucky |
| 21 | Mattie Edelen | 65 | Head | — | Kentucky |
| 22 | Iray Thornton | 67 | Brother | — | Kentucky |
| 23 | Maggie Baker | 39 | Head | Laundress | Kentucky |
| 24 | Annie Harter | 50 | Head | — | Kentucky |
| 25 | Mary Hughes | 24 | Daughter | Maid | Kentucky |
| 26 | William Adam | 39 | Head | Truck Driver | Kentucky |
| 27 | Lillie Warren | 22 | Lodger | — | Kentucky |
| 28 | Cecil Ray | 36 | Head | Maid | Kentucky |
| 29 | John Cobb | 36 | Head | Laborer | Kentucky |
| 30 | Pearl Mudd | 30 | Head | Maid | Kentucky |
| 31 | Joe Miller Biggers | 30 | Head | Mechanic | Kentucky |
| 32 | Bernard Downs | 25 | Head | Barber | Kentucky |
| 33 | Alberta Downs | 20 | Wife | Cook | Kentucky |
| 34 | Robert Gore | 11 | Nephew | — | Kentucky |
| 35 | Elizabeth Daugherty | 30 | Head | Cook | Indiana |
| 36 | Joe Daugherty | 40 | Brother | Cook | Kentucky |
| 37 | Daisy Jones | 49 | Head | — | Kentucky |
| 38 | Dolores Mcatee | 11 | Daughter | — | Kentucky |
| 39 | Henry Mcatee | 9 | Son | — | Kentucky |
| 40 | Charles Ray | 35 | Head | Mechanic | 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)