MK
Mary Keefe — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Keefe across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1924), then head of a 5-person household.
Age 16
b. ~1924
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Keefe |
| Given Name | Mary Lou |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Industry | 0 |
| Highest Grade | Hs 2 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1924 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Donald Keefe | Son | — | 13 | ~1927 |
| Mary Keefe | Daughter | — | 16 | ~1924 |
| Dennis Keefe | Head | — | 39 | ~1901 |
| Charles Keefe | Son | — | 15 | ~1925 |
| Victoria Keefe | Spouse | — | 38 | ~1902 |
Census Appearances
1930
Cook, Illinois
Daughter, age 6
Cook, Illinois · implied b. ~1924 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Keefe |
| Given Name | Margery J. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 16
Cook-County, Illinois · implied b. ~1924 — 5 household members
| Surname | Keefe |
| Given Name | Mary Lou |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Industry | 0 |
| Highest Grade | Hs 2 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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 Keefe across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Keefe
Daughter · 1940 · age 16 · b. ~1924 · Illinois
★ You are viewing this record
Sibling
Donald Keefe
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Charles Keefe
Sibling · 1940 · age 15
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
40 people indexed on this census page (nara:1940:m-t0627-00942-00335)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Dorothy Young | 7 | Daughter | — | Illinois |
| 42 | George E. Young | 44 | Head | Mechanic | Illinois |
| 43 | Anna Young | 32 | Wife | Line Feeder | Illinois |
| 44 | Wallace Young | 20 | Son | Stock Clerk | Illinois |
| 45 | John Minovic | 34 | Head | Diesel Drawer | Illinois |
| 46 | Lillian Minovic | 35 | Wife | — | Pennsylvania |
| 47 | Lorraine Minovic | 12 | Daughter | — | Illinois |
| 48 | Lester Minovic | 10 | Son | — | Illinois |
| 49 | Jean Minovic | 8 | Daughter | — | Illinois |
| 50 | Steve Tomosek | 37 | Head | Conveyor | Czechoslovakia |
| 51 | Margaret Tomosek | 33 | Wife | — | Illinois |
| 52 | Edward Tomosek | 11 | Son | — | Illinois |
| 53 | Helene Tate | 45 | Boarder | — | California |
| 54 | Vincenzo Monarelli | 49 | Head | Matron | Italy |
| 55 | Joe Monarelli | 26 | Son | Heater Helper | Illinois |
| 56 | Vera Monarelli | 24 | Daughter | Keypunch Operator | Illinois |
| 57 | Anita Monarelli | 22 | Daughter | Stenographer | Illinois |
| 58 | Emil Monarelli | 21 | Son | Inspector | Illinois |
| 59 | Joseph Price | 52 | Head | Stationary Engineer | Yugoslavia |
| 60 | Stella Price | 50 | Wife | — | Yugoslavia |
| 61 | Nick Nojeic | 47 | Nephew | Tavern Owner | Yugoslavia |
| 62 | Helen Nojeic | 30 | Niece | — | Illinois |
| 63 | Robert Nojeic | 5 | Grandson | — | Illinois |
| 64 | Michael Gozdovic | 50 | Head | Sheeter | Yugoslavia |
| 65 | Eva Gozdovic | 50 | Wife | — | Yugoslavia |
| 66 | Mary Gozdovic | 18 | Daughter | — | Illinois |
| 67 | Michael Gozdovic | 16 | Son | — | Illinois |
| 68 | Katie Tupur | 40 | Head | — | Yugoslavia |
| 69 | Robert Podnar | 44 | Head | Real Estate | Yugoslavia |
| 70 | Mary Podnar | 39 | Wife | — | Iowa |
| 71 | Dorothy Podnar | 19 | Daughter | Packer | Illinois |
| 72 | Robert Podnar | 15 | Son | — | Illinois |
| 73 | Samuel Podnar | 14 | Son | — | Illinois |
| 74 | Marianne Podnar | 7 | Daughter | — | Illinois |
| 75 | Anne Vadorich | 27 | Sister in law | Salesgirl | Iowa |
| 76 | Dennis J. Keefe | 39 | Head | Salesman | Illinois |
| 77 | Victoria Keefe | 38 | Wife | — | Illinois |
| 78 | Mary Lou Keefe THIS PERSON | 16 | Daughter | — | Illinois |
| 79 | Charles Keefe | 15 | Son | — | Illinois |
| 80 | Donald Keefe | 13 | Son | — | 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)