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Mary Mckenna — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Mckenna across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1927), then head of a 6-person household.
Age 13
b. ~1927
Female
Daughter
Born: West Virginia
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | McKenna |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | West Virginia |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Highest Grade | 5 |
| 1935 Residence | Same Place |
| Birth State | West Virginia |
| Birth Country | United States |
| Birthplace (normalized) | west virginia |
| Township / Ward | Chicago |
| Est. Birth Year | ~1927 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Mckenna | Daughter | — | 13 | ~1927 |
| John Mckenna | Head | — | 52 | ~1888 |
| Teddy Mckenna | Son | — | 20 | ~1920 |
| Lawrence Mckenna | Son | — | 16 | ~1924 |
| John Mckenna | Son | — | 20 | ~1920 |
| Christine Mckenna | Spouse | — | 47 | ~1893 |
Census Appearances
1930
Cook, Illinois
Daughter, age 3
Cook, Illinois · implied b. ~1927 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McKenna |
| Given Name | Mary R |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | West Virginia |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Occupation | none |
| Birth State | West Virginia |
| Birth Country | United States |
| Birthplace (normalized) | west virginia |
1940
Cook-County, Illinois
Daughter, age 13
Cook-County, Illinois · implied b. ~1927 — 6 household members
| Surname | McKenna |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | West Virginia |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Highest Grade | 5 |
| 1935 Residence | Same Place |
| Birth State | West Virginia |
| Birth Country | United States |
| Birthplace (normalized) | west virginia |
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 Mckenna across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Mckenna
Daughter · 1940 · age 13 · b. ~1927 · Illinois
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Sibling
Lawrence Mckenna
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Mckenna
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Teddy Mckenna
Sibling · 1940 · age 20
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 — Cook-County, Illinois
Open full size
1940 US Federal Census — Cook-County, Illinois
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-00952-00137)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Grace Doring | 39 | Wife | — | Illinois |
| 42 | Robert Doring | 17 | Son | — | Illinois |
| 43 | June Doring | 11 | Daughter | — | Illinois |
| 44 | Reginald Schultz | 38 | Head | Die Maker | Minnesota |
| 45 | Anna K. Schultz | 27 | Wife | — | Illinois |
| 46 | Harvey Schultz | 2 | Son | — | Illinois |
| 47 | Agnes Sullivan | 63 | Head | — | Illinois |
| 48 | Jerry Sullivan | 25 | Nephew | Baker | Illinois |
| 49 | William Ulrich | 55 | Head | Roofer | Jugoslavia |
| 50 | Elizabeth Ulrich | 54 | Wife | — | Jugoslavia |
| 51 | Philip Schinborn | 78 | Head | Agent | Illinois |
| 52 | Ella Schinborn | 77 | Wife | — | Illinois |
| 53 | Emma Matthews | 71 | Sister | — | Illinois |
| 54 | Erwin Stepek | 40 | Head | Police Officer | Illinois |
| 55 | Catherine Stepek | 38 | Wife | — | Illinois |
| 56 | Dorothy Stepek | 20 | Daughter | Stenographer | Illinois |
| 57 | Donald Stepek | 15 | Son | — | Illinois |
| 58 | Virginia Stepek | 13 | Daughter | — | Illinois |
| 59 | Robert Stepek | 11 | Son | — | Illinois |
| 61 | Alfred Herrington | 33 | Head | Clerical | Illinois |
| 62 | Rita Herrington | 36 | Wife | — | Illinois |
| 63 | Betty M. Herrington | 11 | Daughter | — | Illinois |
| 64 | William Herrington | 9 | Son | — | Illinois |
| 65 | Peggy A. Herrington | 6 | Daughter | — | Illinois |
| 66 | John Mckenna | 52 | Head | Machinist | Illinois |
| 67 | Christine Mckenna | 47 | Wife | — | Illinois |
| 68 | John Jr. Mckenna | 20 | Son | Laborer | Illinois |
| 69 | Teddy Mckenna | 20 | Son | New Worker | Illinois |
| 70 | Lawrence Mckenna | 16 | Son | — | West Virginia |
| 71 | Mary Mckenna THIS PERSON | 13 | Daughter | — | West Virginia |
| 72 | Charles Fennessy | 33 | Head | Bus Driver | Illinois |
| 73 | Anna Fennessy | 32 | Wife | — | Illinois |
| 74 | Savannah Fennessy | 13 | Daughter | — | Illinois |
| 75 | Shirley Fennessy | 11 | Daughter | — | Illinois |
| 76 | Charles Jr. Fennessy | 4 | Son | — | Illinois |
| 77 | Oscar Alvin | 37 | Head | Motorman | Illinois |
| 78 | Elsie Alvin | 35 | Wife | — | Illinois |
| 79 | Wilbur Alvin | 11 | Son | — | Illinois |
| 80 | Doris Alvin | 6 | Daughter | — | Illinois |
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)