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James Blake — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this James Blake across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1929), then head of a 7-person household.
Age 11
b. ~1929
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Blake |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1929 |
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 James | Age | Birth yr |
|---|---|---|---|---|
| Marie Blake | Daughter | — | 20 | ~1920 |
| James Blake | Son | — | 11 | ~1929 |
| Josephine Blake | Daughter | — | 19 | ~1921 |
| James Blake | Son | — | 6 | ~1934 |
| Emily Blake | Daughter | — | 16 | ~1924 |
| Marie Blake | Spouse | — | 42 | ~1898 |
| James Blake | Head | — | 43 | ~1897 |
Census Appearances
1930
Cook, Illinois
Son, age 3
Cook, Illinois · implied b. ~1927 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Blake |
| Given Name | James |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | none |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 11
Cook-County, Illinois · implied b. ~1929 — 7 household members
| Surname | Blake |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| 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 James Blake across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
James Blake
Son · 1940 · age 11 · b. ~1929 · Illinois
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Sibling
Josephine Blake
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Blake
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marie Blake
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Emily Blake
Sibling · 1940 · age 16
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
39 people indexed on this census page (nara:1940:m-t0627-00952-00924)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 2 | John Freiberg | 70 | Head | Proprietor | Bohemia |
| 3 | Anna Freiberg | 56 | Wife | Proprietor | Bohemia |
| 4 | Joseph Likas | 34 | Head | Painter + Decorator | Illinois |
| 5 | Alice Likas | 29 | Wife | — | Illinois |
| 6 | Barbara Likas | 5 | Daughter | — | Illinois |
| 7 | Patricia Likas | 2 | Daughter | — | Illinois |
| 8 | Otto Prochnow | 53 | Head | Chauffeur | Illinois |
| 9 | Bessie Prochnow | 49 | Wife | — | Illinois |
| 10 | Raymond Prochnow | 20 | Son | Packer | Illinois |
| 11 | Anna Koziel | 70 | Head | — | Bohemia |
| 12 | Victor Prokop | 39 | Head | Laborer | Austria |
| 13 | Mary Prokop | 35 | Wife | Dish Washer | Austria |
| 14 | Steve Prokop | 13 | Son | — | Indiana |
| 15 | Sophie Kus | 77 | Head | — | Bohemia |
| 16 | Frank Kus | 51 | Son | — | Illinois |
| 17 | Walter Wawrzynski | 26 | Head | Laborer | Illinois |
| 18 | Stella Wawrzynski | 24 | Wife | — | Illinois |
| 19 | Edwin Padajor | 20 | Lodger | Laborer | Illinois |
| 20 | Mary Gulan | 56 | Head | — | Poland |
| 21 | Barbara Gulan | 22 | Daughter | Machine Operator | Illinois |
| 22 | Victoria Gulan | 16 | Daughter | — | Illinois |
| 23 | Joseph Grodsky | 39 | Head | Laborer | Pennsylvania |
| 24 | Mary Grodsky | 29 | Wife | — | Illinois |
| 25 | Donald Grodsky | 6 | Son | — | Illinois |
| 26 | Edward Grodsky | 3 | Son | — | Illinois |
| 27 | Alice Grodsky | 2 | Daughter | — | Illinois |
| 28 | Barbara Kloboucnik | 65 | Head | Proprietor | Bohemia |
| 29 | Marie Kloboucnik | 22 | Daughter | — | Illinois |
| 30 | Marie Bohacek | 66 | Sister | — | Bohemia |
| 31 | John Oliver | 65 | Head | Laborer | Ireland |
| 32 | Emma Oliver | 55 | Wife | — | Illinois |
| 33 | James Blake | 43 | Head | Tool + Die Maker | Illinois |
| 34 | Marie Blake | 42 | Wife | — | Illinois |
| 35 | Marie Blake | 20 | Daughter | Supervisor | Illinois |
| 36 | Josephine Blake | 19 | Daughter | Typist | Illinois |
| 37 | Emily Blake | 16 | Daughter | — | Illinois |
| 38 | James Blake THIS PERSON | 11 | Son | — | Illinois |
| 39 | James Blake | 6 | Son | — | Illinois |
| 40 | Homer Carter | 48 | Head | Barber | Illinois |
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)