JD
John Duncan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Rio-Grande-County, Colorado
Our Model Tree links this John Duncan across the 1920, 1930 and 1940 US Censuses in Rio-Grande-County, Colorado (XGBoost, ~Confirmed) — first a head (b.~1887), then head of a 6-person household.
Age 53
b. ~1887
Male
Head
Born: Colorado
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Rio-Grande-County, Colorado |
| Surname | Duncan |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 53 |
| Marital Status | Married |
| Birthplace | Colorado |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Rio Grande |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 60 |
| Income (1939) | 0 |
| Highest Grade | No 4 |
| 1935 Residence | Colorado |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
| Occupation | Farmer |
| Township / Ward | Precinct 3 |
| Est. Birth Year | ~1887 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Duncan | Head | — | 53 | ~1887 |
| Walter Dilley | Other | — | 53 | ~1887 |
| Dean Duncan | Son | — | 12 | ~1928 |
| Kieth Duncan | Son | — | 13 | ~1927 |
| Floyd Duncan | Son | — | 30 | ~1910 |
| Maude Duncan | Spouse | — | 49 | ~1891 |
Census Appearances
1920
Rio Grande, …
Head, age 33
Rio Grande, Colorado · implied b. ~1887 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 33 |
| Marital Status | Married |
| Birthplace | Colorado |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Occupation | Farmer |
| Industry | General Farm |
| Class of Worker | Em |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | O |
| Home Free/Mortgaged | M |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
1930
Rio Grande, …
Head, age 43
Rio Grande, Colorado · implied b. ~1887 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 43 |
| Marital Status | Married |
| Birthplace | Colorado |
| Age at First Marriage | 22 |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Occupation | Merchant |
| Industry | Retail |
| Class of Worker | OA |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 2000 |
| Radio Set | R |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
1940
Rio-Grande-County, Colorado
Head, age 53
Rio-Grande-County, Colorado · implied b. ~1887 — 6 household members
| Surname | Duncan |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 53 |
| Marital Status | Married |
| Birthplace | Colorado |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Rio Grande |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 60 |
| Income (1939) | 0 |
| Highest Grade | No 4 |
| 1935 Residence | Colorado |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
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 53 · b. ~1887 · Colorado
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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 — Rio-Grande-County, Colorado
Open full size
1940 US Federal Census — Rio-Grande-County, Colorado
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00478-00292)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Eleanor Dominguez | 2 | daughter | — | Colorado |
| 42 | Billy Dominguez | 5 | son | — | Colorado |
| 43 | Martha Hibler | 73 | Head | — | Colorado |
| 44 | Charlie Hibler | 35 | son | Farmer | Colorado |
| 45 | Huey Fucks | 29 | Head | Farmer | Colorado |
| 46 | Margaret Fucks | 27 | wife | — | Colorado |
| 47 | Freddie Fucks | 2 | son | — | Colorado |
| 48 | Joe Trujillo | 26 | Laborer | Farm Hand | Colorado |
| 49 | Frank Hanna | 65 | Head | Farmer | Colorado |
| 50 | Flora Hanna | 65 | wife | — | Switzerland |
| 51 | Jim Ferron | 59 | Head | Farmer | New York |
| 52 | Jim Jr Ferron | 12 | son | — | Colorado |
| 53 | Thelma Ferron | 11 | daughter | — | Colorado |
| 54 | Jack Ryan | 34 | Head | Farmer | Colorado |
| 55 | Evelyn Ryan | 30 | wife | — | Colorado |
| 56 | Jackie Ryan | 8 | daughter | — | Colorado |
| 57 | Louise Davis | 20 | Servant | Servant | Colorado |
| 58 | Julia Hedger | 48 | Head | — | Illinois |
| 59 | Walter Hedger | 18 | son | Farm Hand | Iowa |
| 60 | Thomas Hedger | 11 | son | — | Iowa |
| 61 | John Duncan THIS PERSON | 53 | Head | Farmer | Colorado |
| 62 | Maude Duncan | 49 | wife | — | West Virginia |
| 63 | Floyd Duncan | 30 | son | Farmer | Colorado |
| 64 | Kieth Duncan | 13 | son | — | Colorado |
| 65 | Dean Duncan | 12 | son | — | Colorado |
| 66 | Walter Dilley | 53 | Laborer | Miner | West Virginia |
| 67 | Joe Novacek | 26 | Head | Farmer | Nebraska |
| 68 | Lucille Novacek | 25 | wife | — | Nebraska |
| 69 | Gloria Novacek | 2 | daughter | — | Nebraska |
| 70 | Gary Novacek | 1 | son | — | Nebraska |
| 71 | I. J. Brooks | 37 | Head | Farmer | Kansas |
| 72 | Clara Bell Brooks | 30 | wife | — | California |
| 73 | Fred A Kernen | 62 | Head | Farmer | Switzerland |
| 74 | Mary Kernen | 61 | wife | — | Switzerland |
| 75 | John Kernen | 17 | son | — | Colorado |
| 76 | Calvin Kernen | 14 | son | — | Colorado |
| 77 | Lloyd A Kerman | 30 | Head | Farmer | Colorado |
| 78 | Hazel Kerman | 31 | wife | — | Nebraska |
| 79 | Jimmy Kerman | 1 | son | — | Colorado |
| 80 | Earle Reed | 26 | Head | Farmer | Colorado |
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)