JC
James Clarke — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this James Clarke across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1923), then head of a 8-person household.
Age 17
b. ~1923
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Clarke |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | H 2 |
| 1935 Residence | Same House |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago |
| Est. Birth Year | ~1923 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| James Clarke | Son | — | 17 | ~1923 |
| John Clarke | Head | — | 55 | ~1885 |
| Josephine Clarke | Daughter | — | 22 | ~1918 |
| Michael Clarke | Son | — | 5 | ~1935 |
| Barbara Clarke | Daughter | — | 25 | ~1915 |
| Patrick Clarke | Son | — | 19 | ~1921 |
| Mathilda Clarke | Daughter | — | 14 | ~1926 |
| Marie Clarke | Spouse | — | 45 | ~1895 |
Census Appearances
1930
Cook, Illinois
Son, age 5
Cook, Illinois · implied b. ~1925 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clarke |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Occupation | none |
| Can Read/Write | No |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 17
Cook-County, Illinois · implied b. ~1923 — 8 household members
| Surname | Clarke |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Income (1939) | 0 |
| Highest Grade | H 2 |
| 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 James Clarke across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
James Clarke
Son · 1940 · age 17 · b. ~1923 · Illinois
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Sibling
Josephine Clarke
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Michael Clarke
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Barbara Clarke
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patrick Clarke
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mathilda Clarke
Sibling · 1940 · age 14
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-t0627-00998-00145)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Otto A Dony | 64 | Head | — | Germany |
| 42 | Mary Dony | 64 | Wife | — | Germany |
| 43 | James Mc Donnell | 37 | Head | — | Iowa |
| 44 | Martha @ Mc Donnell | 34 | Wife | Wrapper | Illinois |
| 45 | Michael Marino | 31 | Head | Machinist | Illinois |
| 46 | Julia @ Marino | 24 | Wife | Assembler | Illinois |
| 47 | Frank Hill | 48 | Head | Bricklayer | Poland |
| 48 | Catherine Hill | 40 | Wife | — | Poland |
| 49 | Edward @ Hill | 14 | Son | — | Illinois |
| 50 | Walter Hill | 12 | Son | — | Illinois |
| 51 | Joseph Hill | 11 | Son | — | Illinois |
| 52 | Louis Duda | 49 | Head | Machinist | Poland |
| 53 | Josephine @ Duda | 49 | Wife | — | Poland |
| 54 | Louis Jr. Duda | 20 | Son | Packer | Illinois |
| 55 | Thaddeus Duda | 16 | Son | — | Illinois |
| 56 | John S. Clarke | 55 | Head | Bricklayer | Pennsylvania |
| 57 | Marie @ Clarke | 45 | Wife | — | Austria |
| 58 | Barbara Clarke | 25 | Daughter | Looper Mach. | Illinois |
| 59 | Josephine Clarke | 22 | Daughter | Looper Mach. | Illinois |
| 60 | Patrick Clarke | 19 | Son | — | Illinois |
| 61 | James Clarke THIS PERSON | 17 | Son | — | Illinois |
| 62 | Mathilda Clarke | 14 | Daughter | — | Illinois |
| 63 | Michael Clarke | 5 | Son | — | Illinois |
| 64 | Anthony Ziebel | 43 | Head | Bricklayer | Illinois |
| 65 | Frances Ziebel | 42 | Wife | — | Illinois |
| 66 | Thomas Ziebel | 21 | Son | Sprayer | Illinois |
| 67 | Gordon Ziebel | 9 | Son | — | Illinois |
| 68 | Dorothy Brick | 19 | Daughter | Packer | Illinois |
| 69 | Stanley Kopczyk | 59 | Head | Kitchen Helper | Poland |
| 70 | Mary Kopczyk | 55 | Wife | — | Poland |
| 71 | Louis Kopczyk | 20 | Son | Inventory Clerk | Illinois |
| 72 | Frederick Kopczyk | 10 | Son | — | Illinois |
| 73 | Svante E. Forslund | 69 | Head | Blacksmith | Sweden |
| 74 | Inga Forslund | 62 | Wife | — | Sweden |
| 75 | Mary Morrell | 61 | Lodger | — | Illinois |
| 76 | Frederick Jr. Morrell | 19 | Lodger | — | Illinois |
| 77 | — | None | — | — | — |
| 78 | Gilbert Clemons | 33 | Head | Staty Fireman | Wisconsin |
| 79 | Miriam Clemons | 32 | Wife | — | Illinois |
| 80 | Janet Clemons | 5 | Daughter | — | 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)