RD
Robert Duncan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Monroe-County, Indiana
Our Model Tree links this Robert Duncan across the 1930 and 1940 US Censuses in Monroe-County, Indiana (XGBoost, ~Confirmed) — first a son (b.~1921), then head of a 10-person household.
Age 19
b. ~1921
Male
Son
Born: Indiana
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Monroe-County, Indiana |
| Surname | Duncan |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Bloomington |
| 1935 Residence (County) | Monroe |
| Additional Details | |
| Occupation | Laborer |
| Industry | C.C.C. |
| Class of Worker | GW |
| Hours Worked | 6 |
| Income (1939) | 360 |
| Highest Grade | No 4 |
| 1935 Residence | Same place |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
| Occupation | Laborer |
| Township / Ward | Bloomington |
| 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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Robert | Age | Birth yr |
|---|---|---|---|---|
| Maxine Duncan | Daughter | — | 18 | ~1922 |
| George Duncan | Son | — | 21 | ~1919 |
| Herbert Duncan | Son | — | 16 | ~1924 |
| Vivian Duncan | Daughter | — | 13 | ~1927 |
| Ralph Duncan | Son | — | 10 | ~1930 |
| Maud Duncan | Head | — | 47 | ~1893 |
| Donald Duncan | Son | — | 11 | ~1929 |
| Richard Duncan | Son | — | 8 | ~1932 |
| Virginia Duncan | Daughter | — | 15 | ~1925 |
| Robert Duncan | Son | — | 19 | ~1921 |
Census Appearances
1930
Monroe, Indiana
Son, age 9
Monroe, Indiana · implied b. ~1921 — 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 | 9 |
| 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
Monroe-County, Indiana
Son, age 19
Monroe-County, Indiana · implied b. ~1921 — 10 household members
| Surname | Duncan |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Bloomington |
| 1935 Residence (County) | Monroe |
| Occupation | Laborer |
| Industry | C.C.C. |
| Class of Worker | GW |
| Hours Worked | 6 |
| Income (1939) | 360 |
| Highest Grade | No 4 |
| 1935 Residence | Same place |
| 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 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Robert Duncan
Son · 1940 · age 19 · b. ~1921 · Indiana
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Sibling
Vivian Duncan
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ralph Duncan
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Donald Duncan
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
George Duncan
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Herbert Duncan
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Richard Duncan
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Virginia Duncan
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Maxine Duncan
Sibling · 1940 · age 18
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 — Monroe-County, Indiana
Open full size
1940 US Federal Census — Monroe-County, Indiana
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01079-00470)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Roscoe Pruett | 40 | Head | Attendant | Indiana |
| 42 | May Pruett | 44 | Wife | — | Indiana |
| 43 | Wayne Pruett | 17 | Son | — | Indiana |
| 44 | Paul Pruett | 15 | Son | — | Indiana |
| 45 | Morris Pruett | 13 | Son | — | Indiana |
| 46 | James Hayes | 43 | Brother-in-law | Laborer | Indiana |
| 47 | William E. Allen | 42 | Head | Linen Supply | Indiana |
| 48 | Josephine Allen | 37 | Wife | — | Indiana |
| 49 | John E. Allen | 12 | Son | — | Indiana |
| 50 | Maud Duncan | 47 | Head | — | Indiana |
| 51 | Robert Duncan THIS PERSON | 19 | Son | Laborer | Indiana |
| 52 | Maxine Duncan | 18 | Daughter | — | Indiana |
| 53 | Herbert Duncan | 16 | Son | — | Indiana |
| 54 | Virginia Duncan | 15 | Daughter | — | Indiana |
| 55 | Vivian Duncan | 13 | Daughter | — | Indiana |
| 56 | Donald Duncan | 11 | Son | — | Indiana |
| 57 | Ralph Duncan | 10 | Son | — | Indiana |
| 58 | Richard Duncan | 8 | Son | — | Indiana |
| 59 | George Duncan | 21 | Son | Laborer | Indiana |
| 60 | Philip Reity | 60 | Head | R.R. Engineer | Indiana |
| 61 | Margaret Reity | 43 | Wife | — | Kentucky |
| 62 | Jean Reity | 18 | Daughter | — | Kentucky |
| 63 | Mary Gardener | 53 | Head | — | Indiana |
| 64 | Thomas Lindsay | 53 | Head | Switchman | Indiana |
| 65 | Nora Lindsay | 51 | Wife | — | Indiana |
| 66 | Kenneth Lindsay | 19 | Son | — | Indiana |
| 67 | Ruth Martineau | 15 | Step-Daughter | — | Indiana |
| 68 | John Chastine | 49 | Head | Painter & Decorator | Indiana |
| 69 | Mary Chastine | 45 | Wife | — | Indiana |
| 70 | W. S. Wiley | 62 | Head | Covering Chairs | Indiana |
| 71 | Mayme Wiley | 62 | Wife | — | Indiana |
| 72 | Dorothy Wiley | 27 | Daughter | — | Indiana |
| 73 | Doris Wiley | 20 | Daughter | Cashier | Indiana |
| 74 | Rice Wampler | 67 | Head | Drug Clerk | Indiana |
| 75 | William Wampler | 29 | Son | — | Indiana |
| 76 | America Briscoe | 82 | Mother-in-law | — | Indiana |
| 77 | A. Carl Briscoe | 48 | Brother-in-law | Plumber | Indiana |
| 78 | Virgil Watts | 56 | Head | Crane Operator | Indiana |
| 79 | Martha Watts | 53 | Wife | — | Indiana |
| 80 | Eugene Watts | 15 | Son | News Boy | 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)