RD
Robert Duncan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Grant-County, Kentucky
Our Model Tree links this Robert Duncan across the 1930 and 1940 US Censuses in Grant-County, Kentucky (XGBoost, ~Confirmed) — first a son (b.~1925), then head of a 8-person household.
Age 15
b. ~1925
Male
Son
Born: Kentucky
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Grant-County, Kentucky |
| Surname | Duncan |
| Given Name | Robert James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Kentucky |
| 1935 Residence (City) | Sherman |
| 1935 Residence (County) | Grant |
| Additional Details | |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
| Township / Ward | Sherman |
| 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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Robert | Age | Birth yr |
|---|---|---|---|---|
| Margaret Duncan | Spouse | — | 43 | ~1897 |
| Wilbur Duncan | Son | — | 21 | ~1919 |
| Donald Duncan | Son | — | 23 | ~1917 |
| Robert Duncan | Son | — | 15 | ~1925 |
| James Duncan | Head | — | 46 | ~1894 |
| Edith Duncan | Daughter | — | 18 | ~1922 |
| Mary Duncan | Daughter | — | 12 | ~1928 |
| Patricia Duncan | Daughter | — | 5 | ~1935 |
Census Appearances
1930
Grant, Kentucky
Son, age 5
Grant, Kentucky · implied b. ~1925 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Kentucky |
| Age at First Marriage | 5 |
| Father's Birthplace | Kentucky |
| Mother's Birthplace | Kentucky |
| Can Read/Write | No |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
1940
Grant-County, Kentucky
Son, age 15
Grant-County, Kentucky · implied b. ~1925 — 8 household members
| Surname | Duncan |
| Given Name | Robert James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Kentucky |
| 1935 Residence (City) | Sherman |
| 1935 Residence (County) | Grant |
| Highest Grade | No 7 |
| 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 Robert Duncan across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Robert Duncan
Son · 1940 · age 15 · b. ~1925 · Kentucky
★ You are viewing this record
Sibling
Donald Duncan
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Wilbur Duncan
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edith Duncan
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patricia Duncan
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Duncan
Sibling · 1940 · age 12
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 — Grant-County, Kentucky
Open full size
1940 US Federal Census — Grant-County, Kentucky
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01308-00726)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Robert Snow | 34 | Son | Mechanic | Kentucky |
| 2 | Lorene B. Snow | 29 | Wife | — | Kentucky |
| 3 | William Robert Snow | 10 | Son | — | Kentucky |
| 4 | James Allen Snow | 8 | Son | — | Kentucky |
| 5 | Nellie B. Dunlap | 69 | Head | — | Kentucky |
| 6 | Joan Ann Dunlap | 6 | Granddaughter | — | Kentucky |
| 7 | Gertrude S. Price | 56 | Head | — | Kentucky |
| 8 | Edgar K. Green | 80 | Lodger | — | Kentucky |
| 9 | William H. Tarlton | 86 | Head | — | Ohio |
| 10 | Stella Frank | 51 | Daughter | — | Kentucky |
| 11 | Clifford D. Frank | 31 | Son | Farmer | Kentucky |
| 12 | John Frank Baughn | 54 | Head | Section Hand | Kentucky |
| 13 | Mary G. Baughn | 42 | Wife | — | Kentucky |
| 14 | Edward Baughn | 15 | Son | — | Kentucky |
| 15 | Dolly Mae Baughn | 13 | Daughter | — | Kentucky |
| 16 | Henry Baughn | 9 | Son | — | Kentucky |
| 17 | Sadie Baughn | 6 | Daughter | — | Kentucky |
| 18 | William Willis | 37 | Head | Section Hand | Tennessee |
| 19 | Mary K. Willis | 30 | Wife | — | Kentucky |
| 20 | Doris Jean Willis | 4 | Daughter | — | Kentucky |
| 21 | Joseph Edward Arnold | 59 | Head | Salesman | Kentucky |
| 22 | Lula Mae Arnold | 58 | Wife | — | Kentucky |
| 23 | Lewis D. Dixon | 66 | Head | Farmer | Kentucky |
| 24 | Eva Dixon | 46 | Wife | — | Kentucky |
| 25 | James Edward Duncan | 46 | Head | Section Hand | Kentucky |
| 26 | Margaret Duncan | 43 | Wife | — | Kentucky |
| 27 | Donald Ray Duncan | 23 | Son | Farmer | Kentucky |
| 28 | Wilbur D. Duncan | 21 | Son | New Worker | Kentucky |
| 29 | Edith May Duncan | 18 | Daughter | — | Kentucky |
| 30 | Robert James Duncan THIS PERSON | 15 | Son | — | Kentucky |
| 31 | Mary Rose Duncan | 12 | Daughter | — | Kentucky |
| 32 | Patricia Ann Duncan | 5 | Daughter | — | Kentucky |
| 33 | John F. Pointi | 63 | Head | Water Pumper | Kentucky |
| 34 | Susan Moore Pointi | 51 | Wife | Seamstress | Kentucky |
| 35 | Hurley O. Marksberry | 53 | Head | Farmer | Kentucky |
| 36 | Carrie Marksberry | 46 | Wife | — | Kentucky |
| 37 | Edna Marksberry | 22 | Daughter | — | Kentucky |
| 38 | Edgar Marksberry | 21 | Son | Farmer | Kentucky |
| 39 | Margaret Marksberry | 15 | Daughter | — | Kentucky |
| 40 | Nellie Frank Marksberry | 12 | Daughter | — | Kentucky |
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)