MC
Mary Connell — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Connell across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1911), then head of a 7-person household.
Age 29
b. ~1911
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Connell |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 29 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Stenographer |
| Industry | Plumbing supply Co. |
| Class of Worker | PW |
| Hours Worked | 42 |
| Income (1939) | 988 |
| Highest Grade | H 2 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Stenographer |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1911 |
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 Connell | Head | — | 69 | ~1871 |
| Charles Connell | Son | — | 25 | ~1915 |
| Mary Connell | Daughter | — | 29 | ~1911 |
| Thomas Connell | Son | — | 21 | ~1919 |
| Rosella Connell | Spouse | — | 58 | ~1882 |
| James Connell | Son | — | 23 | ~1917 |
| John Connell | Son | — | 27 | ~1913 |
Census Appearances
1930
Cook, Illinois
Daughter, age 19
Cook, Illinois · implied b. ~1911 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Connell |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 29
Cook-County, Illinois · implied b. ~1911 — 7 household members
| Surname | Connell |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 29 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | Stenographer |
| Industry | Plumbing supply Co. |
| Class of Worker | PW |
| Hours Worked | 42 |
| Income (1939) | 988 |
| Highest Grade | H 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 Connell across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Connell
Daughter · 1940 · age 29 · b. ~1911 · Illinois
★ You are viewing this record
Sibling
Charles Connell
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Connell
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Connell
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Connell
Sibling · 1940 · age 27
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-t0627-00984-00512)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Irene Attolino | 14 | Daughter | New Worker | Illinois |
| 2 | John J. Connell | 69 | Head | — | Illinois |
| 3 | Rosella Connell | 58 | Wife | — | Minnesota |
| 4 | Mary Connell THIS PERSON | 29 | Daughter | Stenographer | Illinois |
| 5 | John Connell | 27 | Son | Laborer | Illinois |
| 6 | Charles Connell | 25 | Son | Bartender | Illinois |
| 7 | James Connell | 23 | Son | Truck Driver | Illinois |
| 8 | Thomas Connell | 21 | Son | Crater | Illinois |
| 9 | Joseph Krolich | 47 | Head | Press Operator | New York |
| 10 | Rose Krolich | 47 | Wife | Packer | New York |
| 11 | Carl Krolich | 37 | Son | Finisher | South Dakota |
| 12 | Florence Krolich | 23 | Daughter | — | New York |
| 13 | Charles D. Bruno | 50 | Head | Salesman | Italy |
| 14 | Patricia Bruno | 43 | Wife | — | Italy |
| 15 | Camille Bruno | 19 | Daughter | Hat Trimmer | Italy |
| 16 | Lena Bruno | 13 | Daughter | — | Italy |
| 17 | Sarah Bruno | 6 | Daughter | — | Italy |
| 18 | Marie Angarola | 45 | Head | Presser | Italy |
| 19 | Robert Angarola | 25 | Son | Machine Operator | Illinois |
| 20 | Joseph Angarola | 23 | Son | Laborer | Illinois |
| 21 | James Angarola | 17 | Son | — | Illinois |
| 22 | Esther Angarola | 14 | Daughter | — | Illinois |
| 23 | Mary Komczyk | 42 | Head | Metal Inspector | Poland |
| 24 | Anne Komczyk | 20 | Daughter | Packer | Illinois |
| 25 | Joseph Komczyk | 18 | Son | New Worker | Illinois |
| 26 | Theodore Komczyk | 15 | Son | — | Illinois |
| 27 | Beatrice Komczyk | 11 | Daughter | — | Illinois |
| 28 | Eleanor Komczyk | 9 | Daughter | — | Illinois |
| 29 | Daniel Barberini | 58 | Head | Laborer | Italy |
| 30 | Rose Barberini | 58 | Wife | — | Italy |
| 31 | Andrew Barberini | 22 | Son | Laborer | Italy |
| 32 | Mary Barberini | 18 | Daughter | New Worker | Illinois |
| 33 | Rosemary Barberini | 16 | Daughter | — | Illinois |
| 34 | Anna Brown | 53 | Head | Presser | Illinois |
| 35 | Robert Brown | 23 | Son | Painter | Illinois |
| 36 | Raymond Brown | 21 | Son | Auto Mechanic | Illinois |
| 37 | Helen Brown | 19 | Daughter | Slicer | Illinois |
| 38 | Alice Brown | 17 | Daughter | — | Illinois |
| 39 | Donald Brown | 13 | Son | — | Illinois |
| 40 | Ignazio Lococo | 49 | Head | Shoe Maker | Italy |
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)