JC
James Clark — 1940 US Census Record
Model Tree available1940 United States Federal Census · Rock-Island-County, Illinois
Our Model Tree links this James Clark across the 1920, 1930 and 1940 US Censuses in Rock-Island-County, Illinois (XGBoost, ~Confirmed), with identified parents Charles & Chas — first a son (b.~1900), then head of a 5-person household.
Age 40
b. ~1900
Male
Son
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Rock-Island-County, Illinois |
| Surname | Clark |
| Given Name | James H. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Moline city |
| 1935 Residence (County) | Rock Island |
| Additional Details | |
| Occupation | draftsman |
| Industry | Farm implement manufacturing co |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1800 |
| Highest Grade | H 2 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Draftsman |
| Township / Ward | Moline City |
| Est. Birth Year | ~1900 |
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 James | Age | Birth yr |
|---|---|---|---|---|
| Charles Clark | Head | — | 63 | ~1877 |
| Lovina Clark | Other | — | 16 | ~1924 |
| Marguerite Clark | Other | — | 25 | ~1915 |
| James Clark | Son | — | 40 | ~1900 |
| Iena Clark | Spouse | — | 64 | ~1876 |
Census Appearances
1920
Rock Island, …
Son, age 20
Rock Island, Illinois · implied b. ~1900 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | James H. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Married |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | apprentice |
| Industry | draftsman |
| Class of Worker | W |
| Can Read | No |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Rock Island, …
Son, age 31
Rock Island, Illinois · implied b. ~1899 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | James H. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | Illinois |
| Age at First Marriage | 21 |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | Draftsman |
| Industry | Deere & Co. |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Rock-Island-County, Illinois
Son, age 40
Rock-Island-County, Illinois · implied b. ~1900 — 5 household members
| Surname | Clark |
| Given Name | James H. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Moline city |
| 1935 Residence (County) | Rock Island |
| Occupation | draftsman |
| Industry | Farm implement manufacturing co |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1800 |
| Highest Grade | H 2 |
| 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 Clark across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Charles Clark (~0.92 confidence) and father Chas Clark (~0.92 confidence) and father Charles Clark (~0.92 confidence) and mother Vessa Clark (~0.92 confidence) and mother Iena Clark (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Charles Clark
b. ~1877
Source father
● Household
· direct · ~0.92
Father
Chas Clark
b. ~1878
Source father
● Household
· direct · ~0.92
Father
Charles Clark
b. ~1871
Source father
● Household
· direct · ~0.92
Mother
Vessa Clark
b. ~1876
Source mother
● Household
· direct · ~0.92
Mother
Iena Clark
b. ~1876
Source mother
● Household
· direct · ~0.92
This person
Anchor record
James Clark
Son · 1940 · age 40 · b. ~1900 · Illinois
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Rock-Island-County, Illinois
Open full size
1940 US Federal Census — Rock-Island-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00875-00893)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Theresa Calzia | 60 | Head | — | Italy |
| 2 | Steve Calzia | 32 | Son | Punch Press Operator | Illinois |
| 3 | James Calzia | 27 | Son | Riveter | Illinois |
| 4 | Joe Calzia | 34 | Head | Laborer | Illinois |
| 5 | Mary Calzia | 39 | Wife | — | Italy |
| 6 | Mary T. Calzia | 4 | Daughter | — | Illinois |
| 7 | Charles C. Clark | 63 | Head | Switchman | Illinois |
| 8 | Iena V. Clark | 64 | Wife | — | Illinois |
| 9 | James H. Clark THIS PERSON | 40 | Son | Draftsman | Illinois |
| 10 | Marguerite Clark | 25 | Daughter-in-law | — | Oklahoma |
| 11 | Lovina Clark | 16 | Granddaughter | — | Illinois |
| 12 | Amelia Swanson | 79 | Head | — | Sweden |
| 13 | Ernest Swanson | 57 | Son | Wood Worker | Illinois |
| 14 | Nina Swanson | 52 | Daughter | Book Keeper | Illinois |
| 15 | Alice M. Swanson | 45 | Daughter | Office Clerk | Illinois |
| 16 | Ida Swanson | 54 | Daughter | — | Illinois |
| 17 | Elmer Whitmarsh | 51 | Head | Mill Wright | Iowa |
| 18 | Alice Whitmarsh | 54 | Wife | — | Nebraska |
| 19 | Linnita Whitmarsh | 18 | Daughter | — | Missouri |
| 20 | Silvio Panicucci | 63 | Head | Assembler | Italy |
| 21 | Otavia Panicucci | 55 | Wife | — | Italy |
| 22 | James E. Morris | 56 | Lodger | Chief Mechanist | Illinois |
| 23 | Haley E. Jennings | 35 | Lodger | Barber | Illinois |
| 24 | Charles Erickson | 22 | Head | Machinist | Iowa |
| 25 | Margaret Erickson | 20 | Wife | — | Iowa |
| 26 | Robert G. Boulting | 30 | Head | Placement Clerk | Illinois |
| 27 | Catherine Boulting | 26 | Wife | — | Illinois |
| 28 | Zella D. Smith | 60 | Head | — | Illinois |
| 29 | Robert J. Funk | 21 | Lodger | Electrical Engineer | Iowa |
| 30 | Wendell Anderberg | 33 | Head | Traveler | Illinois |
| 31 | Anne Anderberg | 31 | Wife | — | Iowa |
| 32 | Glen Hadley | 36 | Head | Truck Driver | Iowa |
| 33 | Ioe Hadley | 25 | Wife | — | Iowa |
| 34 | Florence Donahey | 65 | Head | Principal | Illinois |
| 35 | Grace Donahey | 70 | Sister | — | Illinois |
| 36 | Jennie Vance | 60 | Housekeeper | Housekeeper | Illinois |
| 37 | Richard B. Kirby | 23 | Head | Machine Operator | Illinois |
| 38 | Marcella Kirby | 22 | Wife | — | Illinois |
| 39 | R. Brooks Kirby | 3 | Son | — | Illinois |
| 40 | William G. Kirby | 66 | Head | Machinist | Wisconsin |
Pedigree Summary
James
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)