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James Duncan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Clinton-County, Illinois
Our Model Tree links this James Duncan across the 1930 and 1940 US Censuses in Clinton-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1925), then head of a 10-person household.
Age 15
b. ~1925
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Clinton-County, Illinois |
| Surname | Duncan |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | GERMANTOWN VILLAGE |
| 1935 Residence (County) | CLINTON |
| Additional Details | |
| Occupation | Clerical Work |
| Industry | NYA |
| Class of Worker | GW |
| Hours Worked | 6 |
| Income (1939) | 212 |
| Highest Grade | H 1 |
| 1935 Residence | Same Place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Clerical Work |
| Township / Ward | Germantown Village |
| Est. Birth Year | ~1925 |
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 James | Age | Birth yr |
|---|---|---|---|---|
| Ruth Duncan | Daughter | — | 17 | ~1923 |
| Rosemary Duncan | Daughter | — | 12 | ~1928 |
| Joseph Duncan | Head | — | 43 | ~1897 |
| James Duncan | Son | — | 15 | ~1925 |
| Hubert Duncan | Son | — | 14 | ~1926 |
| Richard Duncan | Son | — | 10 | ~1930 |
| Eugene Duncan | Son | — | 9 | ~1931 |
| John Duncan | Son | — | 11 | ~1929 |
| Jerome Duncan | Son | — | 19 | ~1921 |
| Veronica Duncan | Spouse | — | 44 | ~1896 |
Census Appearances
1930
Clinton, Illinois
Son, age 5
Clinton, Illinois · implied b. ~1925 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Clinton-County, Illinois
Son, age 15
Clinton-County, Illinois · implied b. ~1925 — 10 household members
| Surname | Duncan |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | GERMANTOWN VILLAGE |
| 1935 Residence (County) | CLINTON |
| Occupation | Clerical Work |
| Industry | NYA |
| Class of Worker | GW |
| Hours Worked | 6 |
| Income (1939) | 212 |
| Highest Grade | H 1 |
| 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 Duncan across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
James Duncan
Son · 1940 · age 15 · b. ~1925 · Illinois
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Sibling
Eugene Duncan
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jerome Duncan
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rosemary Duncan
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Richard Duncan
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Duncan
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ruth Duncan
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Hubert Duncan
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 — Clinton-County, Illinois
Open full size
1940 US Federal Census — Clinton-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00770-00297)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Joseph B. Duncan | 43 | Head | Salesman | Ohio |
| 2 | Veronica Duncan | 44 | Wife | — | Illinois |
| 3 | Jerome Duncan | 19 | Son | — | Illinois |
| 4 | Ruth Duncan | 17 | Daughter | Office Clerk | Illinois |
| 5 | James Duncan THIS PERSON | 15 | Son | Clerical Work | Illinois |
| 6 | Hubert Duncan | 14 | Son | — | Illinois |
| 7 | Rosemary Duncan | 12 | Daughter | — | Illinois |
| 8 | John Duncan | 11 | Son | — | Illinois |
| 9 | Richard Duncan | 10 | Son | — | Illinois |
| 10 | Eugene Duncan | 9 | Son | — | Illinois |
| 11 | Henry O. Hermeling | 57 | Head | Thresher | Illinois |
| 12 | Elizabeth Hermeling | 57 | Wife | — | Illinois |
| 13 | William Hermeling | 27 | Son | — | Illinois |
| 14 | Bernard Hermeling | 23 | Son | Laborer | Illinois |
| 15 | Herman Pottasung | 60 | Head | Lumberman | Illinois |
| 16 | John P. Norte | 73 | Head | — | Illinois |
| 17 | Mary Norte | 60 | Wife | — | Illinois |
| 18 | Bernard Budde | 57 | Head | — | Illinois |
| 19 | Elizabeth Budde | 52 | Wife | — | Illinois |
| 20 | Regina Budde | 14 | Daughter | — | Illinois |
| 21 | Irene Budde | 10 | Daughter | Housework | Illinois |
| 22 | Andrew Budde | 7 | Son | — | Illinois |
| 23 | Charles Tume | 43 | Head | Carpenter | Illinois |
| 24 | Mable Tume | 36 | Wife | — | Illinois |
| 25 | Oneita Tume | 10 | Daughter | — | Illinois |
| 26 | Charles R. Tume | 8 | Son | — | Illinois |
| 27 | Claude Tume | 7 | Son | — | Illinois |
| 28 | Beverly Tume | 5 | Daughter | — | Illinois |
| 29 | Conrad Beckmann | 58 | Head | Laborer | Illinois |
| 30 | Louise Beckmann | 45 | Wife | — | Illinois |
| 31 | Bernard Theising | 43 | Boarder | Section Labor | Illinois |
| 32 | Vincent Pingsterhaus | 22 | Head | Laborer | Illinois |
| 33 | Viola Pingsterhaus | 18 | Wife | — | Illinois |
| 34 | Henry Heilman | 55 | Head | Engineer | Illinois |
| 35 | Etha Heilman | 51 | Wife | — | Illinois |
| 36 | Pearl Heilman | 13 | Daughter | — | Illinois |
| 37 | Ellsworth Heilman | 8 | Son | — | Illinois |
| 38 | Christian Lunnemann | 68 | Head | — | Illinois |
| 39 | Anna Schulte | 78 | Boarder | — | Illinois |
| 40 | Frank Hommenberne | 70 | Head | Sexton | Germany |
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)