MC
Mary Coffey — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Coffey across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1928), then head of a 6-person household.
Age 12
b. ~1928
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Coffey |
| Given Name | Mary Ann |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Bloomington |
| 1935 Residence (County) | McLean |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | 6 |
| 1935 Residence | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Brookfield Village |
| 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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Coffey | Daughter | — | 12 | ~1928 |
| Mary Coffey | Spouse | — | 37 | ~1903 |
| John Coffey | Son | — | 17 | ~1923 |
| Elizabeth Coffey | Daughter | — | 8 | ~1932 |
| Edward Coffey | Head | — | 37 | ~1903 |
| Thomas Coffey | Son | — | 9 | ~1931 |
Census Appearances
1930
Cook, Illinois
Daughter, age 1
Cook, Illinois · implied b. ~1929 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Coffey |
| Given Name | Margaret |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 12
Cook-County, Illinois · implied b. ~1928 — 6 household members
| Surname | Coffey |
| Given Name | Mary Ann |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Bloomington |
| 1935 Residence (County) | McLean |
| Class of Worker | 0 |
| Highest Grade | 6 |
| 1935 Residence | Illinois |
| 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 Coffey across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Coffey
Daughter · 1940 · age 12 · b. ~1928 · Illinois
★ You are viewing this record
Sibling
Elizabeth Coffey
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Coffey
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Coffey
Sibling · 1940 · age 9
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-t0627-00781-00114)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Henry Dinocchio | 44 | Head | Bar Tender | Italy |
| 2 | Margaret Dinocchio | 41 | Wife | Clerk | Illinois |
| 3 | Elmer Dinocchio | 6 | Son | — | Illinois |
| 4 | Clement Sr Dinocchio | 74 | Father | — | Italy |
| 5 | Walter G. Chaping | 36 | Head | Teller | Illinois |
| 6 | Bernice G. Chaping | 32 | Wife | Sales Clerk | Illinois |
| 7 | William J. Chaping | 62 | Father | Shipping Clerk | Illinois |
| 8 | Eugene R. Mcdonald | 40 | Head | Cost Clerk | Illinois |
| 9 | Alleta Mcdonald | 42 | Wife | — | Illinois |
| 10 | William Mcdonald | 14 | Son | — | Illinois |
| 11 | Edward W. Coffey | 37 | Head | Pipe Fitter | Illinois |
| 12 | Mary Coffey | 37 | Wife | — | Illinois |
| 13 | John Coffey | 17 | Son | — | Illinois |
| 14 | Mary Ann Coffey THIS PERSON | 12 | Daughter | — | Illinois |
| 15 | Thomas Coffey | 9 | Son | — | Illinois |
| 16 | Elizabeth Coffey | 8 | Daughter | — | Illinois |
| 17 | Anton Brunner | 40 | Head | Mechanical Engineer | Austria |
| 18 | Rose Brunner | 35 | Wife | — | Hungary |
| 19 | Emmett P. Mcgrath | 59 | Head | Superintendent Of Golf Course | Illinois |
| 20 | Anna C. Mcgrath | 59 | Wife | — | Illinois |
| 21 | John A. Hein | 34 | Son | General Office Clerk | Illinois |
| 22 | Grace A. Hein | 28 | Daughter | Stenographer | Illinois |
| 23 | Carl O. Staley | 57 | Head | Salesman | Wisconsin |
| 24 | Barbara Staley | 58 | Wife | — | Illinois |
| 25 | Wilbur Staley | 23 | Son | General Office Clerk | Illinois |
| 26 | George W. Rehfeldt | 36 | Head | General Office Clerk | Illinois |
| 27 | Virginia Rehfeldt | 35 | Wife | — | Illinois |
| 28 | George Thomas Rehfeldt | 8 | Son | — | Illinois |
| 29 | Roberta Mae Rehfeldt | 4 | Daughter | — | Illinois |
| 30 | Anders E. Billings | 33 | Head | Salesman | Illinois |
| 31 | Leora Billings | 33 | Wife | — | Wisconsin |
| 32 | Martin Billings | 9 | Son | — | Illinois |
| 33 | Allan Billings | 1 | Son | — | Illinois |
| 34 | William E. Killis | 28 | Head | Electrician | Illinois |
| 35 | Valeria Killis | 22 | Wife | — | Illinois |
| 36 | June Killis | 1 | Daughter | 0 | Illinois |
| 37 | Louis Weinrich | 40 | Head | Driving Agent | Illinois |
| 38 | Ernestine Weinrich | 32 | Wife | — | Illinois |
| 39 | Ethel Mae Weinrich | 9 | Daughter | — | Illinois |
| 40 | Clara Marie Weinrich | 7 | Daughter | — | 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)