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 Charles & Charles — first a head (b.~1907), then head of a 7-person household.
Age 33
b. ~1907
Male
Head
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Donovan |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 33 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Hiring a man |
| Industry | Contr. |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1715 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Hiring A Man |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1907 |
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 |
|---|---|---|---|---|
| Arlene Donovan | Daughter | — | 7 | ~1933 |
| Geraldine Donovan | Daughter | — | 9 | ~1931 |
| Helen Donovan | Daughter | — | 13 | ~1927 |
| John Donovan | Head | — | 33 | ~1907 |
| John Donovan | Son | — | 11 | ~1929 |
| Richard Donovan | Son | — | 3 | ~1937 |
| Marie Donovan | Spouse | — | 33 | ~1907 |
Census Appearances
1920
Cook, Illinois
Son, age 12
Cook, Illinois · implied b. ~1908 — 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 | 12 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Son, age 22
Cook, Illinois · implied b. ~1908 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Donovan |
| Given Name | John R. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | Stock Clerk |
| Industry | Auto Mfg Co. |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Head, age 33
Cook-County, Illinois · implied b. ~1907 — 7 household members
| Surname | Donovan |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 33 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | Hiring a man |
| Industry | Contr. |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1715 |
| Highest Grade | 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 Charles Bletzer (~0.92 confidence) and father Charles Buster (~0.92 confidence) and mother Nellie Bletzer (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Charles Bletzer
b. ~1876
Source father
● Household
· direct · ~0.92
Father
Charles Buster
b. ~1876
Source father
● Household
· direct · ~0.92
Mother
Nellie Bletzer
b. ~1881
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Donovan
Head · 1940 · age 33 · b. ~1907 · Illinois
★ You are viewing this record
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-t0627-00987-00747)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Dorothy Cont. | 13 | daughter | — | Illinois |
| 2 | Joseph Sootnicki | 28 | son in law | Stove Maker | Illinois |
| 3 | John Donovan THIS PERSON | 33 | Head | Hiring A Man | Illinois |
| 4 | Marie Donovan | 33 | Wife | — | Illinois |
| 5 | Helen Donovan | 13 | daughter | — | Penn. |
| 6 | John Jr. Donovan | 11 | son | — | Illinois |
| 7 | Geraldine Donovan | 9 | daughter | — | Illinois |
| 8 | Arlene Donovan | 7 | daughter | — | Illinois |
| 9 | Richard Donovan | 3 | son | — | Illinois |
| 10 | Jep Johansen | 70 | Head | — | Germany |
| 11 | Sophie Johansen | 69 | Wife | — | Denmark |
| 12 | Myrtle Johansen | 35 | daughter | Income Tax Clerk | Illinois |
| 13 | Lucille Johansen | 34 | daughter | Asst To Mgr. | Illinois |
| 14 | Arthur Johansen | 29 | son | Accountant | Illinois |
| 15 | Louisa Pilaski | 53 | Head | Seamstress | Poland |
| 16 | Walter Pilaski | 33 | son | Laborer | Illinois |
| 17 | Anna Pilaski | 31 | daughter in law | — | Illinois |
| 18 | Eugene Pilaski | 11 | Grand son | — | Illinois |
| 19 | Irene Pilaski | 9 | Grand daughter | — | Illinois |
| 20 | Raymond Pilaski | 2 | Grand son | — | Illinois |
| 21 | Rosina Stubenvoll | 62 | Head | — | Austria |
| 22 | Joseph Stubenvoll | 34 | son | Laborer | Austria |
| 23 | Christ Helman | 60 | Head | — | Norway |
| 24 | Melvine Helman | 58 | Wife | — | Minnesota |
| 25 | Rolf Helman | 34 | son | Production Work | Ohio |
| 26 | George Helman | 31 | son | Draftsman | Illinois |
| 27 | Earl Helman | 24 | son | Apprentice Draftsman | Illinois |
| 28 | Morris D. Tugendhaft | 60 | Head | Agent | Austria |
| 29 | Yettie Tugendhaft | 60 | Wife | — | Hungary |
| 30 | Helen Tugendhaft | 33 | daughter | Public Stenographer | New York |
| 31 | Leo Tugendhaft | 32 | son | Mail Clerk | New York |
| 32 | Dorothy Tugendhaft | 23 | daughter | Office Work | Missouri |
| 33 | Irene Tugendhaft | 27 | daughter | Liner & Trimmer | Missouri |
| 34 | Ruth Tugendhaft | 15 | daughter | — | Illinois |
| 35 | Eli Bowden | 54 | Head | Brick Layer | England |
| 36 | Mary Bowden | 45 | Wife | Supervisor | England |
| 37 | Abraham Izbicky | 61 | Head | Laborer | Poland |
| 38 | Karoline Izbicky | 61 | Wife | — | Poland |
| 39 | Harvey Izbicky | 25 | son | Laborer | Poland |
| 40 | Edna Izbicky | 28 | daughter | — | Poland |
Pedigree Summary
John
Gen 1 · 3 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)