JD
John Duncan — 1940 US Census Record
Model Tree available1940 United States Federal Census · Marion-County, Indiana
Our Model Tree links this John Duncan across the 1920, 1930 and 1940 US Censuses in Marion-County, Indiana (XGBoost, ~Confirmed), with identified parents William & William — first a head (b.~1912), then head of a 3-person household.
Age 28
b. ~1912
Male
Head
Born: Indiana
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Marion-County, Indiana |
| Surname | Duncan |
| Given Name | John T. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Married |
| Birthplace | Indiana |
| 1935 Residence (City) | Lafayette |
| Additional Details | |
| Occupation | Salesman |
| Industry | Wholesale Lumber |
| Class of Worker | PW |
| Hours Worked | 42 |
| Income (1939) | 278 |
| Highest Grade | C 4 |
| 1935 Residence | Indiana |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
| Occupation | Salesman |
| Township / Ward | Indianapolis |
| 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 John | Age | Birth yr |
|---|---|---|---|---|
| John Duncan | Head | — | 28 | ~1912 |
| John Duncan | Son | — | 1 | ~1939 |
| Anna Duncan | Spouse | — | 28 | ~1912 |
Census Appearances
1920
Marion, Indiana
Son, age 6
Marion, Indiana · implied b. ~1914 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | John E. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Ohio |
| Occupation | none |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1930
Marion, Indiana
Son, age 17
Marion, Indiana · implied b. ~1913 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | John E |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Ohio |
| Occupation | delivery boy |
| Industry | retail drugs |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1940
Marion-County, Indiana
Head, age 28
Marion-County, Indiana · implied b. ~1912 — 3 household members
| Surname | Duncan |
| Given Name | John T. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Married |
| Birthplace | Indiana |
| 1935 Residence (City) | Lafayette |
| Occupation | Salesman |
| Industry | Wholesale Lumber |
| Class of Worker | PW |
| Hours Worked | 42 |
| Income (1939) | 278 |
| Highest Grade | C 4 |
| 1935 Residence | Indiana |
| 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 John Duncan across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father William Duncan (~0.80 confidence) and father William Duncan (~0.92 confidence) and mother Martha Duncan (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.88
Father
William Duncan
b. ~None
Source father
● Household
· direct · ~0.8
Father
William Duncan
b. ~1882
Source father
● Household
· direct · ~0.92
Mother
Martha Duncan
b. ~1885
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Duncan
Head · 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 — 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-t0627-01124-00932)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Robert West | 37 | Son | Laborer | Kentucky |
| 2 | John Hughes | 29 | Lodger | Chauffeur | Kentucky |
| 3 | Myrtle Hughes | 28 | Lodger | Laundress | Kentucky |
| 4 | William B. Godfrey | 31 | Head | Porter | Kentucky |
| 5 | Anna Godfrey | 30 | Wife | Maid | Tennessee |
| 6 | William Godfrey | 5 | Son | — | Indiana |
| 7 | Joan Godfrey | 4 | Daughter | — | Indiana |
| 8 | Mary Johnson | 49 | Mother-in-law | — | Tennessee |
| 9 | Walter Olcott | 31 | Lodger | Laborer | Tennessee |
| 10 | Maud Pilgrim | 50 | Lodger | Teacher | Arkansas |
| 11 | Babe Jones | 45 | Lodger | Maid | Arkansas |
| 12 | Here Ends Block 18 And Begins Block 8 | None | — | — | — |
| 13 | Ernest W. Egener | 37 | Head | Baker | Indiana |
| 14 | Lucille Egener | 36 | Wife | Office Clerk | Indiana |
| 15 | Sharon A. Egener | 7 | Daughter | — | Indiana |
| 16 | John V. Henderson | 53 | Head | Pressman | Illinois |
| 17 | Gertrude B. Henderson | 50 | Wife | — | Indiana |
| 18 | John V. Jr. Henderson | 26 | Son | Painter | Illinois |
| 19 | Marion F. Dobson | 23 | Head | Attendant | Indiana |
| 20 | Vila V. Dobson | 20 | Wife | — | Missouri |
| 21 | Allen D. Banks | 24 | Lodger | Shipping Clerk | Indiana |
| 22 | Dora M. Banks | 21 | Lodger | — | Indiana |
| 23 | John T. Duncan THIS PERSON | 28 | Head | Salesman | Indiana |
| 24 | Anna M. Duncan | 28 | Wife | — | Indiana |
| 25 | John T. Jr. Duncan | 1 | Son | — | Indiana |
| 26 | Eugene W. Fogarty | 39 | Head | Accountant | Indiana |
| 27 | Gloria D. Fogarty | 28 | Wife | — | Indiana |
| 28 | Cecelia Fogarty | 5 | Daughter | — | Indiana |
| 29 | Charles H. Larpuke | 32 | Head | Police Officer | Kentucky |
| 30 | Mildred R. Larpuke | 31 | Wife | — | Indiana |
| 31 | Jacqueline J. Larpuke | 10 | Daughter | — | Indiana |
| 32 | Stewart M. Larpuke | 7 | Son | — | Indiana |
| 33 | Betty L. Larpuke | 55 | Mother | Practical Nurse | Indiana |
| 34 | Russell E. Watson | 19 | Brother-in-law | Gas & Electric Worker | Indiana |
| 35 | Eddy J. King | 30 | Head | Salesman | Kentucky |
| 36 | Margaret J. King | 24 | Wife | Saleslady | Indiana |
| 37 | Anna M. King | 59 | Mother | Saleslady | Indiana |
| 38 | Ernest Sperlich | 30 | Head | Foreman | Germany |
| 39 | Grace Sperlich | 22 | Wife | Maid | Ohio |
| 40 | Ernst Sperlich | 57 | Father | — | Germany |
Pedigree Summary
John
Gen 1 · 3 parents
~0.88
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)