MC
Mary Cronin — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Cronin across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1890), then head of a 7-person household.
Age 50
b. ~1890
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Cronin |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 50 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| Additional Details | |
| Occupation | Teacher |
| Industry | School |
| Class of Worker | GW |
| Hours Worked | 25 |
| Income (1939) | 2400 |
| Highest Grade | C 5 |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Teacher |
| Township / Ward | Chicago |
| Est. Birth Year | ~1890 |
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 |
|---|---|---|---|---|
| Mary Cronin | Daughter | — | 50 | ~1890 |
| Benjamin Cronin | Son | — | 36 | ~1904 |
| Carolyn Cronin | Daughter | — | 39 | ~1901 |
| Anna Cronin | Spouse | — | 76 | ~1864 |
| Benjamin Cronin | Head | — | 78 | ~1862 |
| Emmet Cronin | Son | — | 46 | ~1894 |
| Edward Cronin | Son | — | 48 | ~1892 |
Census Appearances
1930
Cook, Illinois
Spouse, age 40
Cook, Illinois · implied b. ~1890 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cronin |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Illinois |
| Age at First Marriage | 18 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 50
Cook-County, Illinois · implied b. ~1890 — 7 household members
| Surname | Cronin |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 50 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| Occupation | Teacher |
| Industry | School |
| Class of Worker | GW |
| Hours Worked | 25 |
| Income (1939) | 2400 |
| Highest Grade | C 5 |
| 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 Cronin across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Cronin
Daughter · 1940 · age 50 · b. ~1890 · Illinois
★ You are viewing this record
Sibling
Edward Cronin
Sibling · 1940 · age 48
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Benjamin Cronin
Sibling · 1940 · age 36
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Emmet Cronin
Sibling · 1940 · age 46
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Carolyn Cronin
Sibling · 1940 · age 39
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-t0627-00932-00627)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Joseph A Mrenka | 40 | Head | Mechanic | Austria |
| 42 | Helen Mrenka | 35 | Wife | — | Illinois |
| 43 | Joseph R Mrenka | 16 | Son | — | Illinois |
| 44 | Mary Ellen Mrenka | 14 | Daughter | — | Illinois |
| 45 | Joseph G Haugh | 50 | Brother-in-law | Operator | Ireland |
| 46 | Lettie C Haugh | 50 | Wife | — | Ireland |
| 47 | Benjamin B Cronin | 78 | Head | Motorman | Ireland |
| 48 | Anna Mary Cronin | 76 | Wife | — | Ireland |
| 49 | Mary Cronin THIS PERSON | 50 | Daughter | Teacher | Illinois |
| 50 | Edward D Cronin | 48 | Son | Civil Engineer | Illinois |
| 51 | Emmet J Cronin | 46 | Son | — | Illinois |
| 52 | Carolyn R Cronin | 39 | Daughter | — | Illinois |
| 53 | Benjamin Cronin | 36 | Son | — | Illinois |
| 54 | Edward B Baldridge | 61 | Head | Carpenter | Ohio |
| 55 | Nina Baldridge | 58 | Wife | — | Michigan |
| 56 | Willard J Froles | 33 | Head | Manager | Michigan |
| 57 | Norma Froles | 32 | Wife | — | Michigan |
| 58 | Anne Froles | 8 | Daughter | — | Michigan |
| 59 | William J Heaney | 65 | Head | Clerk | Illinois |
| 60 | Mary Heaney | 63 | Wife | — | Illinois |
| 61 | Marion Scott | 38 | Daughter | — | Illinois |
| 62 | Margaret Scott | 5 | Granddaughter | — | Illinois |
| 63 | James F Burke | 31 | Head | Asst Engineer | Illinois |
| 64 | Mabel C Burke | 29 | Wife | — | Illinois |
| 65 | Joan Lee Burke | 7 | Daughter | — | Illinois |
| 66 | Rollins Lucier | 57 | Mother | — | Nebraska |
| 67 | Minnie Lucier | 60 | Mother | — | Indiana |
| 68 | George Bodenschatz | 52 | Head | Mech Engineer | Illinois |
| 69 | Ruby Bodenschatz | 43 | Wife | — | Holland |
| 70 | William Morrice | 68 | Father | — | Scotland |
| 71 | Mary Morrice | 66 | Mother | — | Scotland |
| 72 | Catherine Coffee | 38 | Head | Stenographer | Illinois |
| 73 | Mary Coffee | 76 | Mother | — | Illinois |
| 74 | Charles G Kaiser | 35 | Head | Accountant | Illinois |
| 75 | Josephine Kaiser | 38 | Wife | — | Illinois |
| 76 | Orville Hileop | 47 | Head | Switchman | Michigan |
| 77 | Catherine Hileop | 47 | Wife | — | Illinois |
| 78 | Orville Jr Hileop | 17 | Son | — | Illinois |
| 79 | Helen T Duffy | 74 | Mother | — | England |
| 80 | James Lovetty | 27 | Son | Switchman | 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)