JD
John Dunn — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this John Dunn across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents George & George — first a son (b.~1917), then head of a 6-person household.
Age 23
b. ~1917
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Dunn |
| Given Name | John P |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Salesman |
| Industry | Clothing |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 560 |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Salesman |
| Township / Ward | Chicago |
| Est. Birth Year | ~1917 |
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 John | Age | Birth yr |
|---|---|---|---|---|
| Evelyn Dunn | Daughter | — | 19 | ~1921 |
| Loretta Dunn | Daughter | — | 15 | ~1925 |
| George Dunn | Head | — | 52 | ~1888 |
| John Dunn | Son | — | 23 | ~1917 |
| George Dunn | Son | — | 24 | ~1916 |
| Margaret Dunn | Spouse | — | 48 | ~1892 |
Census Appearances
1920
Cook, Illinois
Son, age 2
Cook, Illinois · implied b. ~1918 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Dunn |
| Given Name | John P. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Minnesota |
| Mother's Birthplace | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Son, age 12
Cook, Illinois · implied b. ~1918 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Dunn |
| Given Name | John P |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Illinois |
| Age at First Marriage | 12 |
| Father's Birthplace | Minnesota |
| Mother's Birthplace | Pennsylvania |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 23
Cook-County, Illinois · implied b. ~1917 — 6 household members
| Surname | Dunn |
| Given Name | John P |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Occupation | Salesman |
| Industry | Clothing |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 560 |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| 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 Dunn across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father George Dunn (~0.92 confidence) and father George Dunn (~0.92 confidence) and mother Margaret Dunn (~0.92 confidence) and mother Margaret Dunn (~0.92 confidence) and mother Margaret Dunn (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
George Dunn
b. ~1888
Source father
● Household
· direct · ~0.92
Father
George Dunn
b. ~1889
Source father
● Household
· direct · ~0.92
Mother
Margaret Dunn
b. ~1892
Source mother
● Household
· direct · ~0.92
Mother
Margaret Dunn
b. ~1892
Source mother
● Household
· direct · ~0.92
Mother
Margaret Dunn
b. ~1889
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Dunn
Son · 1940 · age 23 · b. ~1917 · Illinois
★ You are viewing this record
Sibling
George Dunn
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Evelyn Dunn
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Loretta Dunn
Sibling · 1940 · age 15
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-t0627-00980-00066)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Grace M Winkofske | 31 | Wife | — | Wisconsin |
| 2 | Robert J Winkofske | 11 | Son | — | Illinois |
| 3 | Irene E Smith | 37 | Head | Switchboard Operator | Illinois |
| 4 | John Smith | 74 | Father | — | Indiana |
| 5 | George B Dunn | 52 | Head | Wholesale Baker | Illinois |
| 6 | Margaret H Dunn | 48 | Wife | — | Illinois |
| 7 | George S Dunn | 24 | Son | Salesman | Illinois |
| 8 | John P Dunn THIS PERSON | 23 | Son | Salesman | Illinois |
| 9 | Evelyn E Dunn | 19 | Daughter | — | Illinois |
| 10 | Loretta A Dunn | 15 | Daughter | — | Illinois |
| 11 | Frank Parrius | 29 | Head | Barber | Florida |
| 12 | Ethel A Parrius | 32 | Wife | Riveting Machine Operator | Missouri |
| 13 | Elizabeth J Spears | 53 | Mother-in-law | Riveting Machine Operator | Missouri |
| 14 | John J Dempsey | 33 | Head | Order Clerk | Illinois |
| 15 | Mary H Dempsey | 29 | Wife | — | Illinois |
| 16 | Jacqueline Dempsey | 1 | Daughter | — | Illinois |
| 17 | Albert Bertini | 27 | Head | Painter | Illinois |
| 18 | Isabella R Bertini | 26 | Wife | — | Illinois |
| 19 | Lois A Bertini | 1 | Daughter | — | Illinois |
| 20 | Rose M Bertini | 20 | Sister | Inspector | Illinois |
| 21 | William O Herbert | 39 | Head | Freight Handler | Illinois |
| 22 | Blanche C Herbert | 39 | Wife | — | Illinois |
| 23 | Shirley M Herbert | 13 | Daughter | — | Illinois |
| 24 | Kathryn Duffy | 55 | Head | Glove Maker | Germany |
| 25 | Kathryn M Duffy | 26 | Daughter | Assistant Clerk | Illinois |
| 26 | Donald J Duffy | 17 | Son | — | Illinois |
| 27 | Thomas Ringalone | 31 | Head | Laborer | Illinois |
| 28 | Jean Ringalone | 32 | Wife | Beautician | Illinois |
| 29 | Leon E Du Bois | 37 | Head | Salesman | Illinois |
| 30 | Frances Du Bois | 28 | Wife | — | Illinois |
| 31 | Hyman Butler | 36 | Head | Grocery Clerk | Russia |
| 32 | Edith Butler | 35 | Wife | Press Operator | Poland |
| 33 | Albert E Carlstrom | 73 | Head | Engraver | Sweden |
| 34 | Kathryn Carlstrom | 73 | Wife | — | Illinois |
| 35 | Edward Peterka | 40 | Head | Bookkeeping | Illinois |
| 36 | Betty Peterka | 24 | Wife | — | Ohio |
| 37 | Edward Jr Peterka | 2 | Son | — | Maryland |
| 38 | Robert H James | 38 | Head | Repairman | Illinois |
| 39 | Frances K James | 39 | Wife | — | Eire |
| 40 | Thomas J James | 11 | Son | — | Illinois |
Pedigree Summary
John + 3 siblings
Gen 1 · 5 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)