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.~1930), then head of a 6-person household.
Age 10
b. ~1930
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 | Black |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago city |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Highest Grade | G 5 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1930 |
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 |
|---|---|---|---|---|
| Charles Conner | Son | — | 5 | ~1935 |
| Robert Conner | Son | — | 2 | ~1938 |
| James Conner | Head | — | 33 | ~1907 |
| James Conner | Son | — | 7 | ~1933 |
| Ella Conner | Spouse | — | 40 | ~1900 |
| Mary Conner | Daughter | — | 10 | ~1930 |
Census Appearances
1930
Cook, Illinois
Daughter, age 2
Cook, Illinois · implied b. ~1928 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Connor |
| Given Name | Mary E |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Mississippi |
| Mother's Birthplace | Pennsylvania |
| Occupation | none |
| Can Read/Write | Yes |
| Home Owned/Rented | No |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 10
Cook-County, Illinois · implied b. ~1930 — 6 household members
| Surname | Conner |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago city |
| 1935 Residence (County) | Cook |
| Highest Grade | G 5 |
| 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 10 · b. ~1930 · Illinois
★ You are viewing this record
Sibling
Robert Conner
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Conner
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Charles Conner
Sibling · 1940 · age 5
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-t0627-00926-00566)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Eula Mcnutt | 32 | Wife | Housewife | Mississippi |
| 2 | Twila Mcnutt | 13 | Daughter | — | Mississippi |
| 3 | Mary Mcnutt | 11 | Daughter | — | Mississippi |
| 4 | J. C. Mcnutt | 10 | Son | — | Mississippi |
| 5 | Irene Edwards | 38 | Head | Domestic | Kentucky |
| 6 | James O. Edwards | 16 | Son | — | Kentucky |
| 7 | James Donna Edwards | 15 | Son | — | Kentucky |
| 8 | Dorothy Edwards | 11 | Daughter | — | Illinois |
| 9 | Juanita Edwards | 9 | Daughter | — | Illinois |
| 10 | Lillie Manning | 38 | Head | — | Mississippi |
| 11 | Amos Manning | 19 | Son | Laborer | Mississippi |
| 12 | Lily Mae Manning | 7 | Daughter | — | Illinois |
| 13 | Dorothy Manning | 6 | Daughter | — | Illinois |
| 14 | Shirley Manning | 4 | Daughter | — | Illinois |
| 15 | Andrew Montgomery | 34 | Head | Hammerman | Arkansas |
| 16 | Herman Montgomery | 17 | Son | News Vendor | Arkansas |
| 17 | Leah M. Montgomery | 15 | Daughter | — | Arkansas |
| 18 | Charles Montgomery | 12 | Son | — | Illinois |
| 19 | Yvonne Montgomery | 7 | Daughter | — | Illinois |
| 20 | Gwendolyn Montgomery | 3 | Daughter | — | Illinois |
| 21 | Oscar Kendall | 39 | Head | Truck Driver | Georgia |
| 22 | Myrtle Kendall | 37 | Wife | — | North Carolina |
| 23 | Jeanette Kendall | 18 | Daughter | News Vendor | North Carolina |
| 24 | Oscar Kendall | 17 | Son | — | Ohio |
| 25 | Emmalee Kendall | 8 | Daughter | — | Illinois |
| 26 | Donald Kendall | 7 | Son | — | Indianapolis |
| 27 | Anna Bell Arnold | 41 | Head | Maid | Illinois |
| 28 | Herbert Arnold | 20 | Son | News Vendor | Illinois |
| 29 | James Conner | 33 | Head | Sorter Of Cards | Mississippi |
| 30 | Ella Conner | 40 | Wife | — | Pennsylvania |
| 31 | Mary Conner THIS PERSON | 10 | Daughter | — | Illinois |
| 32 | James Jr. Conner | 7 | Son | — | Illinois |
| 33 | Charles Conner | 5 | Son | — | Illinois |
| 34 | Robert Conner | 2 | Son | — | Illinois |
| 35 | Eula Barrett | 48 | Head | Maid | Georgia |
| 36 | Eula Gillum | 14 | Daughter | — | Georgia |
| 37 | Palmer Thompson | 27 | Head | — | Mississippi |
| 38 | Cleo Thompson | 5 | Daughter | — | Illinois |
| 39 | Cora Lee Thompson | 3 | Daughter | — | Illinois |
| 40 | Trula Brooks | 20 | Partner | — | 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)