MC
Mary Conner — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Conner across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1928), then head of a 8-person household.
Age 12
b. ~1928
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Conner |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Harvey City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Harvey City |
| Est. Birth Year | ~1928 |
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 |
|---|---|---|---|---|
| Lyla Conner | Spouse | — | 49 | ~1891 |
| Ralph Conner | Son | — | 19 | ~1921 |
| Robert Conner | Head | — | 47 | ~1893 |
| Regina Conner | Daughter | — | 16 | ~1924 |
| Wilfred Conner | Son | — | 21 | ~1919 |
| Mary Conner | Daughter | — | 12 | ~1928 |
| George Conner | Son | — | 23 | ~1917 |
| Loran Conner | Son | — | 25 | ~1915 |
Census Appearances
1930
Cook, Illinois
Daughter, age
Cook, Illinois · implied b. ~1930 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Connor |
| Given Name | Mary A. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Kentucky |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 12
Cook-County, Illinois · implied b. ~1928 — 8 household members
| Surname | Conner |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Harvey City |
| 1935 Residence (County) | Cook |
| Highest Grade | No 7 |
| 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 Conner across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Conner
Daughter · 1940 · age 12 · b. ~1928 · Illinois
★ You are viewing this record
Sibling
Wilfred Conner
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ralph Conner
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
George Conner
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Regina Conner
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Loran Conner
Sibling · 1940 · age 25
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-t0627-00775-00118)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Imogene Smith | 10 | Daughter | — | Illinois |
| 2 | Charles E. Archer | 51 | Head | Salesman | Michigan |
| 3 | William Lutzie | 46 | Head | Laundry | Greece |
| 4 | Helen Lutzie | 45 | Wife | Launderer | Greece |
| 5 | Lyla Lutzie | 22 | Daughter | Launderer | Illinois |
| 6 | Loris Lutzie | 17 | Daughter | Launderer | Illinois |
| 7 | Sam Lutzie | 12 | Son | — | Illinois |
| 8 | Evelyn Lutzie | 2 | Daughter | — | Illinois |
| 9 | Edwin A. Lelopen | 34 | Head | Surface Clerk | Illinois |
| 10 | Lillian Lelopen | 30 | Wife | — | Illinois |
| 11 | Edwin A. Jr. Lelopen | 1 | Son | — | Illinois |
| 12 | Ragnvald Gohrandson | 60 | Father-in-law | Barber | Norway |
| 13 | Lee Taylor | 34 | Head | Laborer | Kentucky |
| 14 | Hazel Taylor | 32 | Wife | — | Kentucky |
| 15 | Wilbert Taylor | 17 | Son | — | Kentucky |
| 16 | Ray Taylor | 6 | Son | — | Kentucky |
| 17 | Jack Taylor | 2 | Son | — | Illinois |
| 18 | Minnie Shelly | 36 | Lodger | Grinder | Kentucky |
| 19 | Nina Shelly | 31 | Lodger | — | Kentucky |
| 20 | Betty Lou Shelly | 10 | Lodger | — | Kentucky |
| 21 | Ginnie Shelly | 6 | Lodger | — | Kentucky |
| 22 | Robert Conner | 47 | Head | Welder | Indiana |
| 23 | Lyla Conner | 49 | Wife | — | Ohio |
| 24 | Loran Conner | 25 | Son | Machinist | Indiana |
| 25 | George Conner | 23 | Son | Welder | Indiana |
| 26 | Wilfred Conner | 21 | Son | Attendant | Indiana |
| 27 | Ralph Conner | 19 | Son | — | Indiana |
| 28 | Regina Conner | 16 | Daughter | — | Indiana |
| 29 | Mary Conner THIS PERSON | 12 | Daughter | — | Illinois |
| 30 | Raphael Barrett | 42 | Head | Die Setter | Illinois |
| 31 | Mary Barrett | 40 | Wife | — | Michigan |
| 32 | Lillie Barrett | 18 | Daughter | — | Illinois |
| 33 | Jenette Barrett | 15 | Daughter | — | Illinois |
| 34 | Robert Barrett | 2 | Son | — | Illinois |
| 35 | Lee Robinson | 47 | Head | Laborer | Kentucky |
| 36 | Zela Robinson | 47 | Wife | Nurse | Illinois |
| 37 | Edna Ellis | 46 | Head | Waitress | Illinois |
| 38 | Joseph Ellis | 23 | Son | Laborer | Illinois |
| 39 | John R. Ellis | 16 | Son | — | Illinois |
| 40 | Thomas Wayne | 46 | Lodger | Truck Driver | 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)