WC
William Cooper — 1940 US Census Record
Model Tree available1940 United States Federal Census · Kings-County, New York
Our Model Tree links this William Cooper across the 1920, 1930 and 1940 US Censuses in Kings-County, New York (XGBoost, ~Confirmed), with identified parents Isaac & Isadore — first a son (b.~1909), then head of a 5-person household.
Age 31
b. ~1909
Male
Son
Born: New York
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Kings-County, New York |
| Surname | Cooper |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | New York City |
| 1935 Residence (County) | Kings |
| Additional Details | |
| Industry | Private Practice |
| Class of Worker | OA |
| Hours Worked | 50 |
| Income (1939) | 0 |
| Highest Grade | C 5 |
| 1935 Residence | Same home |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
| Township / Ward | New York City |
| Est. Birth Year | ~1909 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Zelma Cooper | Daughter | — | 27 | ~1913 |
| Mildred Cooper | Daughter | — | 25 | ~1915 |
| Isadore Cooper | Head | — | 61 | ~1879 |
| William Cooper | Son | — | 31 | ~1909 |
| Jennie Cooper | Spouse | — | 56 | ~1884 |
Census Appearances
1920
Kings, New …
Son, age 10
Kings, New York · implied b. ~1910 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cooper |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | Russia |
| Mother's Birthplace | Russia |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Yiddish |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1930
Kings, New …
Son, age 21
Kings, New York · implied b. ~1909 — 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 | 21 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | Russia |
| Mother's Birthplace | Russia |
| Occupation | clerk |
| Industry | drug store |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1940
Kings-County, New …
Son, age 31
Kings-County, New York · implied b. ~1909 — 5 household members
| Surname | Cooper |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | New York City |
| 1935 Residence (County) | Kings |
| Industry | Private Practice |
| Class of Worker | OA |
| Hours Worked | 50 |
| Income (1939) | 0 |
| Highest Grade | C 5 |
| 1935 Residence | Same home |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
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 Isaac Cooper (~0.92 confidence) and father Isadore Cooper (~0.92 confidence) and father Isadore Cooper (~0.92 confidence) and mother Fannie Cooper (~0.92 confidence) and mother Jennie Cooper (~0.92 confidence) and mother Lena Cooper (~0.92 confidence). The pedigree spans 1 generation with 6 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Isaac Cooper
b. ~1875
Source father
● Household
· direct · ~0.92
Father
Isadore Cooper
b. ~1879
Source father
● Household
· direct · ~0.92
Father
Isadore Cooper
b. ~1880
Source father
● Household
· direct · ~0.92
Mother
Fannie Cooper
b. ~1880
Source mother
● Household
· direct · ~0.92
Mother
Jennie Cooper
b. ~1884
Source mother
● Household
· direct · ~0.92
Mother
Lena Cooper
b. ~1887
Source mother
● Household
· direct · ~0.92
This person
Anchor record
William Cooper
Son · 1940 · age 31 · b. ~1909 · New York
★ You are viewing this record
Sibling
Zelma Cooper
Sibling · 1940 · age 27
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mildred Cooper
Sibling · 1940 · age 25
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 — Kings-County, New York
Open full size
1940 US Federal Census — Kings-County, New York
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02587-00217)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Hugh B Roarty | 31 | Head | Motorman | Irish Free State |
| 42 | Elizabeth Roarty | 28 | Wife | — | Irish Free State |
| 43 | Catherine Roarty | 1 | Daughter | — | New York |
| 44 | Paul Muding | 30 | Head | Chef | Germany |
| 45 | Rose Muding | 31 | Wife | — | Germany |
| 46 | Patrick Duffy | 50 | Head | Generator Fireman | Irish Free State |
| 47 | Mary Duffy | 46 | Wife | — | Irish Free State |
| 48 | Mary Duffy | 20 | Daughter | Clerk | New York |
| 49 | Catherine Duffy | 19 | Daughter | Clerk | New York |
| 50 | Mary Jenette | 59 | Head | — | Italy |
| 51 | Lena Jenette | 23 | Daughter | Packer | New York |
| 52 | Mildred Jenette | 23 | Daughter | Packer | New York |
| 53 | James Mcguire | 67 | Head | Upholsterer | Irish Free State |
| 54 | Barbara Mcguire | 64 | Wife | — | Irish Free State |
| 55 | Margaret Mcguire | 27 | Daughter | — | New York |
| 56 | John O'Grady | 41 | Head | Stationary Fireman | New York |
| 57 | Florence O'Grady | 38 | Wife | — | New York |
| 58 | John O'Grady | 18 | Son | — | New York |
| 59 | Florence O'Grady | 16 | Daughter | — | New York |
| 60 | Charles O'Grady | 10 | Son | — | New York |
| 61 | Isadore Cooper | 61 | Head | Druggist | Russia |
| 62 | Jennie Cooper | 56 | Wife | — | Russia |
| 63 | William Cooper THIS PERSON | 31 | Son | — | New York |
| 64 | Zelma Cooper | 27 | Daughter | Clerk | New York |
| 65 | Mildred Cooper | 25 | Daughter | Nurse | New York |
| 66 | John Imperatore | 51 | Head | Clerk | New York |
| 67 | Nellie Imperatore | 46 | Wife | — | New York |
| 68 | Edward Imperatore | 27 | Son | Clerk | New York |
| 69 | Arthur Devoe | 34 | Head | Truck Driver | New York |
| 70 | Mary Devoe | 28 | Wife | — | New York |
| 71 | James Devoe | 9 | Son | — | New York |
| 72 | Arthur Devoe | 8 | Son | — | New York |
| 73 | Arline Devoe | 6 | Daughter | — | New York |
| 74 | Edward Powers | 33 | Head | Truck Driver | New York |
| 75 | Margaret Powers | 33 | Wife | — | New York |
| 76 | Mary Powers | 9 | Daughter | — | New York |
| 77 | Patricia Powers | 7 | Daughter | — | New York |
| 78 | John Powers | 5 | Son | — | New York |
| 79 | Joan Powers | 4 | Daughter | — | New York |
| 80 | Joseph Powers | 2 | Son | — | New York |
Pedigree Summary
William + 2 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)