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James Duncan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Montgomery-County, Illinois
Our Model Tree links this James Duncan across the 1920, 1930 and 1940 US Censuses in Montgomery-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1864), then head of a 2-person household.
Age 76
b. ~1864
Male
Head
Born: Illinois
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Montgomery-County, Illinois |
| Surname | Duncan |
| Given Name | James |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 76 |
| Marital Status | Widowed |
| Birthplace | Illinois |
| 1935 Residence (City) | Litchfield |
| 1935 Residence (County) | Montgomery |
| Additional Details | |
| Class of Worker | 0 |
| Hours Worked | 0 |
| Highest Grade | H-2 |
| 1935 Residence | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Litchfield City |
| Est. Birth Year | ~1864 |
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.
2 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| James Duncan | Head | — | 76 | ~1864 |
| Walter Duncan | Son | — | 53 | ~1887 |
Census Appearances
1920
Montgomery, Illinois
Head, age 53
Montgomery, Illinois · implied b. ~1867 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | James |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 53 |
| Marital Status | Widowed |
| Birthplace | Illinois |
| Father's Birthplace | N Carolina |
| Mother's Birthplace | Illinois |
| Can Read | No |
| Can Write | No |
| Speaks English | Yes |
| Home Owned/Rented | R |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Montgomery, Illinois
Head, age 66
Montgomery, Illinois · implied b. ~1864
●
Primary link
· ~Confirmed · 1 source
XGBoost
| Surname | Duncan |
| Given Name | James |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 66 |
| Marital Status | Widowed |
| Birthplace | Illinois |
| Age at First Marriage | 22 |
| Father's Birthplace | South Carolina |
| Mother's Birthplace | Illinois |
| Occupation | Retired |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 400 |
| Radio Set | R |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Montgomery-County, Illinois
Head, age 76
Montgomery-County, Illinois · implied b. ~1864 — 2 household members
| Surname | Duncan |
| Given Name | James |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 76 |
| Marital Status | Widowed |
| Birthplace | Illinois |
| 1935 Residence (City) | Litchfield |
| 1935 Residence (County) | Montgomery |
| Class of Worker | 0 |
| Hours Worked | 0 |
| Highest Grade | H-2 |
| 1935 Residence | Illinois |
| 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 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
James Duncan
Head · 1940 · age 76 · b. ~1864 · Illinois
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Montgomery-County, Illinois
Open full size
1940 US Federal Census — Montgomery-County, Illinois
Page Contents
37 people indexed on this census page (nara:1940:m-t0627-00860-00697)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Chas Burdell | 30 | Head | Truck Driver | Illinois |
| 2 | Carrie Burdell | 28 | Wife | — | Missouri |
| 3 | Betty Jane Burdell | 9 | Daughter | — | Missouri |
| 4 | Bobby Burdell | 8 | Son | — | Illinois |
| 5 | Charles Burdell | 5 | Son | — | Illinois |
| 6 | Richard Burdell | 2 | Son | — | Illinois |
| 7 | Frederick Burdell | 1 | Son | — | Illinois |
| 8 | James Duncan THIS PERSON | 76 | Head | — | Illinois |
| 9 | Walter Duncan | 53 | Son | Laborer | Illinois |
| 10 | Chas Poppenhouse | 31 | Head | Body Trimmer | Missouri |
| 11 | Gladys Poppenhouse | 34 | Wife | Waitress | Illinois |
| 12 | Dorothy Poppenhouse | 13 | Daughter | — | Illinois |
| 13 | Dean Poppenhouse | 9 | Son | — | Illinois |
| 14 | Chas Martin | 30 | Head | Laborer | Illinois |
| 15 | Juanita Martin | 23 | Wife | Laundress | Illinois |
| 16 | George Robert Martin | 5 | Son | — | Illinois |
| 17 | Wm Ross Martin | 5 | Son | — | Illinois |
| 18 | Joseph Barrett | 60 | Head | Laborer | Ohio |
| 19 | Anna Barrett | 70 | Wife | — | Indiana |
| 20 | Harry Bellety | 49 | Head | Poultry Man | Arkansas |
| 21 | Ethel Bellety | 50 | Wife | — | Illinois |
| 22 | Eureka Bellety | 27 | Son | Edge Setter | Illinois |
| 23 | Marian Bellety | 16 | Daughter | — | Illinois |
| 24 | Alpha Roberts | 64 | Head | Signal Man | Illinois |
| 25 | Lilla Roberts | 60 | Wife | — | Ohio |
| 26 | Lloyd Nett | 43 | Head | Laborer | Illinois |
| 27 | Ruth Nett | 39 | Wife | Tel. Operator | Illinois |
| 28 | Mary Margaret Nett | 13 | Daughter | — | Illinois |
| 29 | Billie Jean Nett | 10 | Son | — | Illinois |
| 30 | Mary Allen | 47 | Head | Rooming House | Nebraska |
| 31 | Lottie Sparks | 71 | Mother | — | Illinois |
| 32 | Cecil Simms | 32 | Roomer | Laborer | Illinois |
| 33 | Wade Bailey | 35 | Roomer | Laborer | Illinois |
| 34 | Belle Bishop | 36 | Roomer | Waitress | Illinois |
| 35 | Ben Reese | 61 | Roomer | Laborer | Illinois |
| 36 | Margaret Reese | 55 | Roomer | — | Missouri |
| 37 | Newton Williams | 64 | Head | Farmer | 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)