WC
William Cooper — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this William Cooper across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Abraham & Cathrine — first a son (b.~1914), then head of a 10-person household.
Age 26
b. ~1914
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Cooper |
| Given Name | William |
| 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 | Butcher |
| Industry | Meat Market |
| Class of Worker | PW |
| Hours Worked | 50 |
| Income (1939) | 1170 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Butcher |
| 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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Marie Cooper | Daughter | — | 24 | ~1916 |
| Anne Cooper | Daughter | — | 30 | ~1910 |
| Lilly Cooper | Daughter | — | 15 | ~1925 |
| Ida Cooper | Daughter | — | 24 | ~1916 |
| Emma Cooper | Daughter | — | 19 | ~1921 |
| Alida Cooper | Daughter | — | 16 | ~1924 |
| Abraham Cooper | Head | — | 60 | ~1880 |
| William Cooper | Son | — | 26 | ~1914 |
| Benjamin Cooper | Son | — | 28 | ~1912 |
| Cathrine Cooper | Spouse | — | 56 | ~1884 |
Census Appearances
1920
Cook, Illinois
Son, age 4
Cook, Illinois · implied b. ~1916 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cooper |
| Given Name | William |
| 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 15
Cook, Illinois · implied b. ~1915 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cooper |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| 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 — 10 household members
| Surname | Cooper |
| Given Name | William |
| 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 | Butcher |
| Industry | Meat Market |
| Class of Worker | PW |
| Hours Worked | 50 |
| Income (1939) | 1170 |
| Highest Grade | H-4 |
| 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 William Cooper across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Abraham Cooper (~0.92 confidence) and mother Cathrine Cooper (~0.92 confidence) and father William Cooper (~0.92 confidence) and father Thomas Cooper (~0.92 confidence) and mother Mary Cooper (~0.92 confidence) and mother Lucile Cooper (~0.92 confidence). The pedigree spans 1 generation with 6 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Abraham Cooper
b. ~1880
Source father
● Household
· direct · ~0.92
Mother
Cathrine Cooper
b. ~1884
Source mother
● Household
· direct · ~0.92
Father
William Cooper
b. ~1885
Source father
● Household
· direct · ~0.92
Father
Thomas Cooper
b. ~1888
Source father
● Household
· direct · ~0.92
Mother
Mary Cooper
b. ~1891
Source mother
● Household
· direct · ~0.92
Mother
Lucile Cooper
b. ~1895
Source mother
● Household
· direct · ~0.92
This person
Anchor record
William Cooper
Son · 1940 · age 26 · b. ~1914 · Illinois
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Sibling
Benjamin Cooper
Sibling · 1940 · age 28
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Emma Cooper
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anne Cooper
Sibling · 1940 · age 30
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Alida Cooper
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marie Cooper
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lilly Cooper
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ida Cooper
Sibling · 1940 · age 24
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
36 people indexed on this census page (nara:1940:m-t0627-00939-00567)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John Pachuckas | 46 | Head | Varnish Maker | Illinois |
| 2 | Jeanette Pachuckas | 47 | Wife | — | Lithuania |
| 3 | Jeanette Pachuckas | 21 | Daughter | — | Illinois |
| 4 | Suzana Rauka | 67 | Mother-in-law | Char Woman | Lithuania |
| 5 | Nancy Rauka | 15 | Sister-in-law | — | Illinois |
| 6 | William Paskas | 49 | Lodger | Laborer | Lithuania |
| 7 | Abraham Cooper | 60 | Head | Plasterer | Holland |
| 8 | Cathrine Cooper | 56 | Wife | — | Holland |
| 9 | Anne M. Cooper | 30 | Daughter | Clerical | Illinois |
| 10 | Benjamin Cooper | 28 | Son | Proprietor | Illinois |
| 11 | William Cooper THIS PERSON | 26 | Son | Butcher | Illinois |
| 12 | Marie Cooper | 24 | Daughter | Clerical | Illinois |
| 13 | Ida Cooper | 24 | Daughter | Compt. Oper. | Illinois |
| 14 | Emma Cooper | 19 | Daughter | Clerical | Illinois |
| 15 | Alida Cooper | 16 | Daughter | — | Illinois |
| 16 | Lilly Jane Cooper | 15 | Daughter | — | Illinois |
| 17 | John Lukis | 57 | Head | Janitor | Lithuania |
| 18 | Anna Lukis | 57 | Wife | — | Lithuania |
| 19 | Helen Lukis | 14 | Daughter | Packer | Illinois |
| 20 | John Lukis | 14 | Son | Pressing Clerk | Illinois |
| 21 | Joseph Bruzas | 44 | Head | Fitter | Illinois |
| 22 | Anna Bruzas | 46 | Wife | — | Illinois |
| 23 | John Bruzas | 18 | Son | — | Illinois |
| 24 | Frank Kregel | 59 | Head | Car Builder | Lithuania |
| 25 | Amelia Kregel | 56 | Wife | — | Poland |
| 26 | Helen Kregel | 24 | Daughter | Saleslady | Illinois |
| 27 | Frank Kregel | 23 | Son | — | Illinois |
| 28 | Paul Petronis | 54 | Head | Machinist | Lithuania |
| 29 | Pauline Petronis | 54 | Wife | — | Lithuania |
| 30 | Aldona Petronis | 23 | Daughter | Factory Worker | Illinois |
| 31 | Oswald Petronis | 18 | Son | Spot Welder | Illinois |
| 32 | John Ostrand | 59 | Head | Car Builder | Sweden |
| 33 | Mina Ostrand | 60 | Wife | — | Sweden |
| 34 | Roland Ostrand | 16 | Son | Laborer | Illinois |
| 35 | Chester Baldewicz | 18 | Son | — | Illinois |
| 36 | Edward Szymowski | 23 | Lodger | Power Tube | Illinois |
Related Census Records
Pedigree Summary
William + 7 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)