RD
Robert Duncan — 1940 US Census Record
Model Tree available1940 United States Federal Census · Madison-County, Indiana
Our Model Tree links this Robert Duncan across the 1920, 1930 and 1940 US Censuses in Madison-County, Indiana (XGBoost, ~Confirmed), with identified parents Bertha & James — first a son (b.~1912), then head of a 3-person household.
Age 28
b. ~1912
Male
Son
Born: Indiana
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Madison-County, Indiana |
| Surname | Duncan |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Anderson - city |
| 1935 Residence (County) | Madison |
| Additional Details | |
| Occupation | Clerk |
| Industry | Prison |
| Class of Worker | PW |
| Hours Worked | 46 |
| Income (1939) | 1200 |
| Highest Grade | H-4 |
| 1935 Residence | Same House |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
| Occupation | Clerk |
| Township / Ward | Anderson City |
| Est. Birth Year | ~1912 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Robert | Age | Birth yr |
|---|---|---|---|---|
| Robert Duncan | Son | — | 28 | ~1912 |
| Louie Duncan | Head | — | 62 | ~1878 |
| Bertha Duncan | Spouse | — | 65 | ~1875 |
Census Appearances
1920
Madison, Indiana
Son, age 8
Madison, Indiana · implied b. ~1912 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Occupation | none |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1930
Madison, Indiana
Son, age 18
Madison, Indiana · implied b. ~1912 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | Robert F |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Can Read/Write | Yes |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1940
Madison-County, Indiana
Son, age 28
Madison-County, Indiana · implied b. ~1912 — 3 household members
| Surname | Duncan |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Anderson - city |
| 1935 Residence (County) | Madison |
| Occupation | Clerk |
| Industry | Prison |
| Class of Worker | PW |
| Hours Worked | 46 |
| Income (1939) | 1200 |
| Highest Grade | H-4 |
| 1935 Residence | Same House |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
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 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Bertha Duncan (~0.92 confidence) and father James Duncan (~0.92 confidence) and mother Gertrude Duncan (~0.92 confidence) and father Louie Duncan (~0.92 confidence) and father Squire Duncan (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Bertha Duncan
b. ~1875
Source mother
● Household
· direct · ~0.92
Father
James Duncan
b. ~1877
Source father
● Household
· direct · ~0.92
Mother
Gertrude Duncan
b. ~1878
Source mother
● Household
· direct · ~0.92
Father
Louie Duncan
b. ~1878
Source father
● Household
· direct · ~0.92
Father
Squire Duncan
b. ~1879
Source father
● Household
· direct · ~0.92
This person
Anchor record
Robert Duncan
Son · 1940 · age 28 · b. ~1912 · Indiana
★ 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 — Madison-County, Indiana
Open full size
1940 US Federal Census — Madison-County, Indiana
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01072-00254)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Gretchen Ross | 30 | Wife | Housewife | Indiana |
| 2 | Vee Ross | 2 | Daughter | — | Indiana |
| 3 | Lowell Jarrett | 30 | Head | Shipping Clerk | Indiana |
| 4 | Ruby Jarrett | 30 | Wife | — | Indiana |
| 5 | Jackie Jarrett | 9 | Son | — | Indiana |
| 6 | John R Gilkey | 33 | Head | Tool Maker | Indiana |
| 7 | Ruth Gilkey | 29 | Wife | — | Indiana |
| 8 | Laura Blizzard | 59 | Head | — | Indiana |
| 9 | Evelyn Blizzard | 33 | Daughter | Seamstress | Indiana |
| 10 | Arvis Blizzard | 27 | Daughter | Inspector | Indiana |
| 11 | Paul Stephenson | 33 | Head | Jig Borer | Indiana |
| 12 | Mable Stephenson | 31 | Wife | — | Indiana |
| 13 | Verle L Stephenson | 1 | Son | — | Indiana |
| 14 | Francis Bright | 24 | Head | Tool Maker | Indiana |
| 15 | Geneva Bright | 21 | Wife | Winder | Indiana |
| 16 | John Hadley | 37 | Head | Press Operator | Indiana |
| 17 | Wynema Hadley | 32 | Wife | Assembler | Indiana |
| 18 | John Charlier | 59 | Head | Mechanic | Belgium |
| 19 | Alice Charlier | 57 | Wife | — | Belgium |
| 20 | Marie Charlier | 30 | Daughter | Teacher | Indiana |
| 21 | Mozella Isabell | 26 | Lodger | Assembler | Alabama |
| 22 | Robert Haugh | 28 | Head | Laborer | Indiana |
| 23 | Christena Haugh | 25 | Wife | — | Indiana |
| 24 | Luther Swafford | 32 | Head | Salesman | Tennessee |
| 25 | Lottie Mae Swafford | 22 | Wife | Housekeeper | Indiana |
| 26 | Charles R Boone | 48 | Head | Tool Maker | Indiana |
| 27 | Myra Boone | 45 | Wife | — | Indiana |
| 28 | Betty Jane Boone | 15 | Daughter | — | Indiana |
| 29 | Josephine Rhydell | 64 | Head | — | Germany |
| 30 | Margaret Rhydell | 30 | Daughter | Cashier | Indiana |
| 31 | Florence Rhydell | 34 | Daughter | Bookkeeper | Indiana |
| 32 | Louise Rhydell | 28 | Daughter | Tel Operator | Indiana |
| 33 | Louie O Duncan | 62 | Head | Heater | Indiana |
| 34 | Bertha Duncan | 65 | Wife | — | Indiana |
| 35 | Robert Duncan THIS PERSON | 28 | Son | Clerk | Indiana |
| 36 | Paul Twincher | 36 | Head | Wire Caster | Indiana |
| 37 | Mildred Twincher | 31 | Wife | — | Illinois |
| 38 | Martha Twincher | 13 | Daughter | — | Indiana |
| 39 | Joe Twincher | 9 | Son | — | Indiana |
| 40 | Caroline Twincher | 6 | Daughter | — | Indiana |
Pedigree Summary
Robert
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)