MC
Mary Conley — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Conley across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1919), then head of a 7-person household.
Age 21
b. ~1919
Female
Daughter
Born: Missouri
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Conley |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Missouri |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Tag sorter |
| Industry | Mail Order |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1300 |
| Highest Grade | H 4 |
| 1935 Residence | Same House |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
| Occupation | Tag Sorter |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1919 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| John Conley | Son | — | 19 | ~1921 |
| Laura Conley | Spouse | — | 49 | ~1891 |
| Mary Conley | Daughter | — | 21 | ~1919 |
| Thomas Conley | Son | — | 11 | ~1929 |
| James Conley | Head | — | 50 | ~1890 |
| Bernadine Conley | Daughter | — | 15 | ~1925 |
| Robert Conley | Son | — | 13 | ~1927 |
Census Appearances
1930
Cook, Illinois
Daughter, age 11
Cook, Illinois · implied b. ~1919 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Conley |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Missouri |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
1940
Cook-County, Illinois
Daughter, age 21
Cook-County, Illinois · implied b. ~1919 — 7 household members
| Surname | Conley |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Missouri |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | Tag sorter |
| Industry | Mail Order |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1300 |
| Highest Grade | H 4 |
| 1935 Residence | Same House |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
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 Conley across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Conley
Daughter · 1940 · age 21 · b. ~1919 · Illinois
★ You are viewing this record
Sibling
Thomas Conley
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Conley
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Conley
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Bernadine Conley
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-t0627-00937-00480)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Helene D Cranky | 39 | Daughter | Clerk | Illinois |
| 42 | Carlysle Dengel | 36 | Head | Insurance Adj | Pennsylvania |
| 43 | Virginia G Dengel | 34 | Wife | — | Illinois |
| 44 | Virginia Ann Dengel | 8 | Daughter | — | Illinois |
| 45 | Mary Caryl Dengel | 4 | Daughter | — | Illinois |
| 46 | Hans Kolb | 47 | Head | Proprietor | Germany |
| 47 | Ellen Kolb | 32 | Wife | — | Indiana |
| 48 | William Kolb | 15 | Son | — | Illinois |
| 49 | Robert Kolb | 11 | Son | — | Illinois |
| 50 | Marie Kolb | 77 | Mother | — | Germany |
| 51 | Robert Byrne | 26 | Head | Salesman | Illinois |
| 52 | Eileen Byrne | 26 | Wife | — | Illinois |
| 53 | Gay Byrne | 1 | Daughter | — | Illinois |
| 54 | James Conley | 50 | Head | Agent | Illinois |
| 55 | Laura Conley | 49 | Wife | Housework | Illinois |
| 56 | Mary Conley THIS PERSON | 21 | Daughter | Tag Sorter | Missouri |
| 57 | John Conley | 19 | Son | Office Worker | Missouri |
| 58 | Bernadine Conley | 15 | Daughter | — | Illinois |
| 59 | Robert Conley | 13 | Son | — | Illinois |
| 60 | Thomas Conley | 11 | Son | — | Illinois |
| 61 | Anthony Heinz | 40 | Head | Sales Supervisor | Illinois |
| 62 | Margaret Heinz | 40 | Wife | — | Illinois |
| 63 | Richard Heinz | 14 | Son | — | Illinois |
| 64 | Margaret Mary Heinz | 12 | Daughter | — | Illinois |
| 65 | Ruth Heinz | 2 | Daughter | — | Illinois |
| 66 | Charles French | 54 | Head | Salesman | England |
| 67 | Louise French | 46 | Wife | Cloculin Teacher | Illinois |
| 68 | Marylouise French | 18 | Daughter | — | Illinois |
| 69 | Florence French | 13 | Daughter | — | Illinois |
| 70 | Catherine French | 8 | Daughter | — | Illinois |
| 71 | Walter Oberski | 49 | Head | Electrical Contractor | Illinois |
| 72 | Angeline Oberski | 44 | Wife | — | Illinois |
| 73 | Richard Oberski | 21 | Son | — | Illinois |
| 74 | Claire Golkowski | 14 | Sister-in-law | — | Illinois |
| 75 | Rose Wacker | 45 | Head | Relief Telephone Opr | Illinois |
| 76 | Daniel J Leahy | 51 | Brother-in-law | Salesman | Illinois |
| 77 | Dolores M Leahy | 24 | Niece | Telephone Opr | Illinois |
| 78 | Betty Leahy | 15 | Niece | — | Illinois |
| 79 | William Hollens | 36 | Head | Stationary Eng | Illinois |
| 80 | Lucille Hollens | 36 | Wife | — | Indiana |
Related Census Records
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)