MD
Mary Donovan — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Donovan across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents John & John — first a daughter (b.~1920), then head of a 6-person household.
Age 20
b. ~1920
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Donovan |
| Given Name | Mary Jane |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Clerk |
| Industry | Recorder's City office |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 266 |
| Highest Grade | H 4 |
| 1935 Residence | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Clerk |
| Township / Ward | Oak Park |
| Est. Birth Year | ~1920 |
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 |
|---|---|---|---|---|
| Patricia Donovan | Daughter | — | 16 | ~1924 |
| Mary Donovan | Daughter | — | 20 | ~1920 |
| John Donovan | Head | — | 53 | ~1887 |
| John Donovan | Son | — | 19 | ~1921 |
| Richard Donovan | Son | — | 5 | ~1935 |
| Dorothy Donovan | Spouse | — | 39 | ~1901 |
Census Appearances
1920
Cook, Illinois
Daughter, age
Cook, Illinois · implied b. ~1920 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Donovan |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Daughter, age 10
Cook, Illinois · implied b. ~1920 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Donovan |
| Given Name | Mary Jane |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| 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 20
Cook-County, Illinois · implied b. ~1920 — 6 household members
| Surname | Donovan |
| Given Name | Mary Jane |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Occupation | Clerk |
| Industry | Recorder's City office |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 266 |
| Highest Grade | H 4 |
| 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 Donovan across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Donovan (~0.92 confidence) and father John Donovan (~0.92 confidence) and father John Donovan (~0.92 confidence) and mother Mary Donovan (~0.92 confidence) and mother Dorothy Donovan (~0.92 confidence) and mother Dorothy Donovan (~0.92 confidence). The pedigree spans 1 generation with 6 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Donovan
b. ~1857
Source father
● Household
· direct · ~0.92
Father
John Donovan
b. ~1887
Source father
● Household
· direct · ~0.92
Father
John Donovan
b. ~1896
Source father
● Household
· direct · ~0.92
Mother
Mary Donovan
b. ~1896
Source mother
● Household
· direct · ~0.92
Mother
Dorothy Donovan
b. ~1898
Source mother
● Household
· direct · ~0.92
Mother
Dorothy Donovan
b. ~1901
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Donovan
Daughter · 1940 · age 20 · b. ~1920 · Illinois
★ You are viewing this record
Sibling
Richard Donovan
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patricia Donovan
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Donovan
Sibling · 1940 · age 19
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-t0627-00785-00771)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Eugene V. Mclaughlin | 5 | son | — | Illinois |
| 42 | Evelyn O'Hara | 37 | maid | Maid | New York |
| 43 | Victor Nadherny | 46 | Head | Tailor | Illinois |
| 44 | Helen Nadherny | 37 | wife | — | Illinois |
| 45 | Helen Nadherny | 7 | daughter | — | Illinois |
| 46 | Filip Moser | 64 | father in law | — | Switzerland |
| 47 | Jenny Dornbos | 47 | Head | — | Holland |
| 48 | John Dornbos | 23 | Son | Salesman | Illinois |
| 49 | Frank Kirschbaum | 44 | head | Owner | Illinois |
| 50 | Sarah Kirschbaum | 45 | wife | — | Illinois |
| 51 | Margaret Kirschbaum | 9 | daughter | — | Illinois |
| 52 | Patricia Meagher | 23 | niece | Secretary | Illinois |
| 53 | James C. Whitman | 61 | Head | Building Management | Illinois |
| 54 | Edna Whitman | 50 | wife | — | Illinois |
| 55 | Rudolph Berthold | 57 | Head | Furniture Business | Illinois |
| 56 | Ann Berthold | 56 | wife | — | Indiana |
| 57 | Raymond Berthold | 30 | son | Furniture Business | Illinois |
| 58 | William J. Mcelroy | 64 | head | Salesman | Ireland |
| 59 | Catherine Mcelroy | 39 | wife | — | Ireland |
| 60 | Catherine Mcelroy | 14 | daughter | — | Illinois |
| 61 | William Mcelroy | 13 | son | — | Illinois |
| 62 | Thomas Mcelroy | 11 | son | — | Illinois |
| 63 | John M. Donovan | 53 | head | Publishing Editor | Illinois |
| 64 | Dorothy M. Donovan | 39 | wife | — | Illinois |
| 65 | Mary Jane Donovan THIS PERSON | 20 | daughter | Clerk | Illinois |
| 66 | John M. Jr. Donovan | 19 | son | — | Illinois |
| 67 | Patricia A. Donovan | 16 | daughter | — | Illinois |
| 68 | Richard O. Donovan | 5 | son | — | Illinois |
| 69 | Catherine Mcmullen | 74 | head | — | Illinois |
| 70 | Margaret J. Mcmullen | 38 | daughter | Teacher | Illinois |
| 71 | Alice Sheridan | 75 | head | — | Illinois |
| 72 | Alice Sheridan | 55 | daughter | — | Illinois |
| 73 | Mary Sheridan | 58 | daughter | — | Illinois |
| 74 | John Sheridan | 59 | son | Pressman | Illinois |
| 75 | Andrew Sheridan | 57 | son | Pressman | Illinois |
| 76 | J. A. Smith | 69 | Head | — | England |
| 77 | Lillian Smith | 65 | wife | — | Iowa |
| 78 | Hugh M. Evenson | 49 | Head | Stationary Engineer | Wisconsin |
| 79 | Margaret G. Evenson | 46 | wife | — | Illinois |
| 80 | Owen H. Evenson | 21 | son | Lithographer | Illinois |
Related Census Records
Pedigree Summary
Mary + 3 siblings
Gen 1 · 6 parents
~0.92
Max depth 4 (1900–1950 window)
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)