JD
James Duncan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Marion-County, Indiana
Our Model Tree links this James Duncan across the 1930 and 1940 US Censuses in Marion-County, Indiana (XGBoost, ~Confirmed) — first a son (b.~1921), then head of a 9-person household.
Age 19
b. ~1921
Male
Son
Born: Kentucky
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Marion-County, Indiana |
| Surname | Duncan |
| Given Name | James |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Kentucky |
| 1935 Residence (City) | Indianapolis |
| 1935 Residence (County) | Marion |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | Hs 1 |
| 1935 Residence | Same place |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
| Township / Ward | Indianapolis |
| Est. Birth Year | ~1921 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| Bernice Duncan | Daughter | — | 4 | ~1936 |
| Betty Duncan | Daughter | — | 8 | ~1932 |
| Thelma Duncan | Daughter | — | 16 | ~1924 |
| Tillis Duncan | Head | — | 40 | ~1900 |
| James Duncan | Son | — | 19 | ~1921 |
| William Duncan | Son | — | 10 | ~1930 |
| Robert Duncan | Son | — | 7 | ~1933 |
| Elmer Duncan | Son | — | 20 | ~1920 |
| Reon Duncan | Son | — | 15 | ~1925 |
Census Appearances
1930
Marion, Indiana
Son, age 10
Marion, Indiana · implied b. ~1920 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Kentucky |
| Father's Birthplace | Kentucky |
| Mother's Birthplace | Kentucky |
| Can Read/Write | Yes |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
1940
Marion-County, Indiana
Son, age 19
Marion-County, Indiana · implied b. ~1921 — 9 household members
| Surname | Duncan |
| Given Name | James |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Kentucky |
| 1935 Residence (City) | Indianapolis |
| 1935 Residence (County) | Marion |
| Income (1939) | 0 |
| Highest Grade | Hs 1 |
| 1935 Residence | Same place |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
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 19 · b. ~1921 · Indiana
★ You are viewing this record
Sibling
Reon Duncan
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Bernice Duncan
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thelma Duncan
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elmer Duncan
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Betty Duncan
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Duncan
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Duncan
Sibling · 1940 · age 10
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 — Marion-County, Indiana
Open full size
1940 US Federal Census — Marion-County, Indiana
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01130-00723)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Ralph Morgan | 17 | Son | — | Indiana |
| 42 | Edward Enders | 37 | Head | Machinist | Indiana |
| 43 | Lora Enders | 40 | Wife | — | Indiana |
| 44 | Francis Enders | 17 | daughter | — | Indiana |
| 45 | Margaret Enders | 16 | daughter | — | Indiana |
| 46 | Paul Enders | 13 | son | — | Indiana |
| 47 | Cecilia Enders | 6 | daughter | — | Indiana |
| 48 | William Finch | 30 | Head | Janitor | Kentucky |
| 49 | Cora Finch | 20 | wife | Maid | Kentucky |
| 50 | Mary Finch | 7 | daughter | — | Kentucky |
| 51 | Dottie Walls | 54 | mother-in-law | — | Kentucky |
| 52 | Tillis Duncan | 40 | Head | — | Kentucky |
| 53 | Elmer Duncan | 20 | son | — | Kentucky |
| 54 | James Duncan THIS PERSON | 19 | son | — | Kentucky |
| 55 | Thelma Duncan | 16 | daughter | — | Kentucky |
| 56 | Reon Duncan | 15 | son | — | Kentucky |
| 57 | William Duncan | 10 | son | — | Indiana |
| 58 | Betty Duncan | 8 | daughter | — | Indiana |
| 59 | Robert Duncan | 7 | son | — | Indiana |
| 60 | Bernice Duncan | 4 | daughter | — | Indiana |
| 61 | William Harris | 24 | Head | Laborer | Georgia |
| 62 | Louise Harris | 23 | wife | — | Indiana |
| 63 | Barbara Harris | 8 | daughter | — | Indiana |
| 64 | Mary Louis Harris | 6 | daughter | — | Indiana |
| 65 | Betty Lynn | 45 | Head | Saleswoman | Kentucky |
| 66 | Charles Peck | 45 | Head | — | Indiana |
| 67 | Mike Harland | 44 | Head | Watchman | Indiana |
| 68 | Carrie Harland | 35 | wife | — | Indiana |
| 69 | Joe Harland | 18 | son | Laborer | Indiana |
| 70 | Grace Harland | 14 | daughter | — | Indiana |
| 71 | George Harland | 11 | son | — | Indiana |
| 72 | Mary Harland | 9 | daughter | — | Indiana |
| 73 | John Harland | 6 | son | — | Indiana |
| 74 | Esther Harland | 5 | daughter | — | Indiana |
| 75 | Martha Harland | 2 | daughter | — | Indiana |
| 76 | James Harland | 0 | son | — | Indiana |
| 77 | Silas Pleasant | 52 | Head | Laborer | Ohio |
| 78 | Rosa Pleasant | 47 | wife | — | Indiana |
| 79 | Paul Pleasant | 22 | son | Butcher | Indiana |
| 80 | Raymond Pleasant | 16 | son | — | Indiana |
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)