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John Duncan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Montgomery-County, Virginia
Our Model Tree links this John Duncan across the 1920, 1930 and 1940 US Censuses in Montgomery-County, Virginia (XGBoost, ~Confirmed) — first a head (b.~1874), then head of a 4-person household.
Age 66
b. ~1874
Male
Head
Born: Virginia
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Montgomery-County, Virginia |
| Surname | Duncan |
| Given Name | John H |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 66 |
| Marital Status | Married |
| Birthplace | Virginia |
| 1935 Residence (City) | Christiansburg |
| 1935 Residence (County) | Montgomery |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 20 |
| Income (1939) | 0 |
| Highest Grade | E 3 |
| 1935 Residence | Same place |
| Birth State | Virginia |
| Birth Country | United States |
| Birthplace (normalized) | virginia |
| Occupation | Farmer |
| Township / Ward | Christiansburg |
| Est. Birth Year | ~1874 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Duncan | Head | — | 66 | ~1874 |
| Lannie Duncan | Son | — | 20 | ~1920 |
| Claude Duncan | Son | — | 13 | ~1927 |
| Mary Duncan | Spouse | — | 52 | ~1888 |
Census Appearances
1920
Montgomery, Virginia
Head, age 46
Montgomery, Virginia · implied b. ~1874 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | John S. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 46 |
| Marital Status | Married |
| Birthplace | Virginia |
| Father's Birthplace | Virginia |
| Mother's Birthplace | Virginia |
| Occupation | Farmer |
| Industry | General farm |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | R |
| Birth State | Virginia |
| Birth Country | United States |
| Birthplace (normalized) | virginia |
1930
Montgomery, Virginia
Head, age 54
Montgomery, Virginia · implied b. ~1876 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | John N. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 54 |
| Marital Status | Married |
| Birthplace | Virginia |
| Age at First Marriage | 27 |
| Father's Birthplace | Virginia |
| Mother's Birthplace | Virginia |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 0 |
| Veteran | No |
| Birth State | Virginia |
| Birth Country | United States |
| Birthplace (normalized) | virginia |
1940
Montgomery-County, Virginia
Head, age 66
Montgomery-County, Virginia · implied b. ~1874 — 4 household members
| Surname | Duncan |
| Given Name | John H |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 66 |
| Marital Status | Married |
| Birthplace | Virginia |
| 1935 Residence (City) | Christiansburg |
| 1935 Residence (County) | Montgomery |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 20 |
| Income (1939) | 0 |
| Highest Grade | E 3 |
| 1935 Residence | Same place |
| Birth State | Virginia |
| Birth Country | United States |
| Birthplace (normalized) | virginia |
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.
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This person
Anchor record
John Duncan
Head · 1940 · age 66 · b. ~1874 · Virginia
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Montgomery-County, Virginia
Open full size
1940 US Federal Census — Montgomery-County, Virginia
Page Contents
37 people indexed on this census page (nara:1940:m-t0627-04277-00539)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Son Radford | None | M | — | — |
| 42 | Charles H Moore | 38 | Head | Carpenter | Tennessee |
| 43 | Lucille L Moore | 30 | Wife | — | Virginia |
| 44 | Jean B Moore | 3 | Daughter | — | Virginia |
| 45 | Martha A Murdoch | 63 | Mother-in-law | — | Virginia |
| 46 | James S Simmons | 23 | Head | Fireman | Virginia |
| 47 | Velda B Simmons | 16 | Wife | — | Virginia |
| 48 | Henry E Akere | 31 | Head | Laborer | Virginia |
| 49 | Nellie S Akere | 26 | Wife | — | Virginia |
| 50 | Lannie Akere | 5 | Daughter | — | Virginia |
| 52 | John H Duncan THIS PERSON | 66 | Head | Farmer | Virginia |
| 53 | Mary A Duncan | 52 | Wife | — | Virginia |
| 54 | Lannie H Duncan | 20 | Son | Farm Helper | Virginia |
| 55 | Claude E Duncan | 13 | Son | — | Virginia |
| 56 | Pauline L Donathan | 30 | Head | — | Virginia |
| 57 | Charles E Donathan | 4 | Son | — | Virginia |
| 58 | Samuel A Donathan | 2 | Son | — | Virginia |
| 59 | Minnie S Hooker | 69 | Mother | — | West Virginia |
| 60 | Cloyd F Shepherd | 17 | Nephew | — | West Virginia |
| 61 | Esther Thompson | 40 | Head | — | Virginia |
| 62 | Lucille Thompson | 16 | Daughter | Housework | Virginia |
| 63 | Bernice Thompson | 14 | Daughter | — | Virginia |
| 64 | Vernon Thompson | 9 | Son | — | Virginia |
| 65 | Harvey B Thompson | 6 | Son | — | Virginia |
| 67 | Ballard C Smith | 71 | Head | Farmer | Virginia |
| 68 | Virgie O Smith | 66 | Wife | — | Virginia |
| 69 | Hubert M Allen | 21 | Son-in-law | Body And Fender Man | Virginia |
| 70 | Patricia S Allen | 24 | Daughter | — | Virginia |
| 71 | Imogene Allen | 4 | Granddaughter | — | Virginia |
| 72 | Maxine Allen | 3 | Granddaughter | — | Virginia |
| 73 | Sheldon Allen | 2 | Grandson | — | Virginia |
| 74 | Helene Allen | 0 | Granddaughter | — | Virginia |
| 76 | Allen M Brett | 25 | Head | Fireman | Virginia |
| 77 | Frank L Brett | 16 | Brother | — | Virginia |
| 78 | Dellard Rush | 49 | Head | Laborer | Virginia |
| 79 | Rosa O Rush | 35 | Wife | — | Virginia |
| 80 | Frances Rush | 11 | Daughter | — | Virginia |
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)