JD
John Donovan — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this John Donovan across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Daniel & Nora — first a son (b.~1914), then head of a 7-person household.
Age 26
b. ~1914
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Donovan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Clerk |
| Industry | Public Utility |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1600 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Clerk |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1914 |
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 John | Age | Birth yr |
|---|---|---|---|---|
| Mary Donovan | Daughter | — | 34 | ~1906 |
| Lorine Donovan | Daughter | — | 28 | ~1912 |
| Daniel Donovan | Head | — | 70 | ~1870 |
| John Donovan | Son | — | 26 | ~1914 |
| Walter Donovan | Son | — | 22 | ~1918 |
| William Donovan | Son | — | 40 | ~1900 |
| Nora Donovan | Spouse | — | 68 | ~1872 |
Census Appearances
1920
Cook, Illinois
Son, age 4
Cook, Illinois · implied b. ~1916 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Donovan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Son, age 14
Cook, Illinois · implied b. ~1916 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Donovan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| 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
Son, age 26
Cook-County, Illinois · implied b. ~1914 — 7 household members
| Surname | Donovan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | Clerk |
| Industry | Public Utility |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1600 |
| Highest Grade | No 8 |
| 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 John Donovan across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Daniel Donovan (~0.92 confidence) and mother Nora Donovan (~0.92 confidence) and father John Donovan (~0.92 confidence) and mother Mary Donovan (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Daniel Donovan
b. ~1870
Source father
● Household
· direct · ~0.92
Mother
Nora Donovan
b. ~1872
Source mother
● Household
· direct · ~0.92
Father
John Donovan
b. ~1895
Source father
● Household
· direct · ~0.92
Mother
Mary Donovan
b. ~1896
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Donovan
Son · 1940 · age 26 · b. ~1914 · Illinois
★ You are viewing this record
Sibling
Mary Donovan
Sibling · 1940 · age 34
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Donovan
Sibling · 1940 · age 40
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Walter Donovan
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lorine Donovan
Sibling · 1940 · age 28
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-t0627-00952-00648)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Elizabeth Rankin | 47 | Sister | Seamstress | Illinois |
| 2 | Thomas Rankin | 47 | Brother | Bookkeeper | Illinois |
| 3 | Marie Rankin | 40 | Wife | — | Illinois |
| 4 | Thomas Jr. Rankin | 18 | Nephew | None Worker | Illinois |
| 5 | Daniel Donovan | 70 | Head | — | Illinois |
| 6 | Nora Donovan | 68 | Wife | — | Eire |
| 7 | William Donovan | 40 | Son | Laborer | Illinois |
| 8 | Lorine Donovan | 28 | Daughter | Stenographer | Illinois |
| 9 | John Donovan THIS PERSON | 26 | Son | Clerk | Illinois |
| 10 | Mary Donovan | 34 | Daughter | Seamstress | Illinois |
| 11 | Walter Donovan | 22 | Son | Clerk | Illinois |
| 12 | Edward Miller | 77 | Head | — | Indiana |
| 13 | Louisa Miller | 68 | Wife | — | Maryland |
| 14 | Bessie Miller | 42 | Daughter | Secretary | Illinois |
| 15 | George J. Morgan | 48 | Head | Engineer | Wisconsin |
| 16 | Margaret Morgan | 46 | Wife | Saleslady | Wisconsin |
| 17 | Daniel J. Nieminen | 42 | Head | Salesman | Illinois |
| 18 | Florence Nieminen | 35 | Wife | — | Ohio |
| 19 | Eileen Nieminen | 13 | Daughter | — | Ohio |
| 20 | Daniel Nieminen | 11 | Son | — | Ohio |
| 21 | Marjory Nieminen | 10 | Daughter | — | Ohio |
| 22 | Alice Nieminen | 9 | Daughter | — | Ohio |
| 23 | Jane Nieminen | 4 | Daughter | — | Illinois |
| 24 | Ben Ketch | 34 | Head | Manager | Illinois |
| 25 | Josephine Ketch | 34 | Wife | Beauty Opr. | Illinois |
| 26 | Charles Elliott | 47 | Head | Accountant | Illinois |
| 27 | Katherine Elliott | 44 | Wife | Saleslady | Illinois |
| 28 | Edward Elliott | 21 | Son | Machinist | Illinois |
| 29 | Stephen Hruby | 30 | Head | Receiving | Pennsylvania |
| 30 | Emily Hruby | 30 | Wife | None Worker | Pennsylvania |
| 31 | Thomas Mckittrick | 41 | Head | Salesman | Illinois |
| 32 | Agnes Mckittrick | 32 | Wife | — | Illinois |
| 33 | Carl W. Larson | 48 | Head | Foreman | Wisconsin |
| 34 | Marion Larson | 37 | Wife | — | Nebraska |
| 35 | Joseph A. Embach | 45 | Head | Stock Clerk | Illinois |
| 36 | Mathilda Embach | 46 | Wife | — | Illinois |
| 37 | Loraine Embach | 18 | Daughter | Stenographer | Illinois |
| 38 | John W. Embach | 14 | Son | — | Illinois |
| 39 | Charles Guerin | 53 | Head | Salesman | Lithuania |
| 40 | Eugenia Guerin | 48 | Wife | Saleslady | Lithuania |
Pedigree Summary
John + 4 siblings
Gen 1 · 4 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)