WD
William Duncan — 1940 US Census Record
Model Tree available1940 United States Federal Census · Pembina-County, North Dakota
Our Model Tree links this William Duncan across the 1920, 1930 and 1940 US Censuses in Pembina-County, North Dakota (XGBoost, ~Confirmed), with identified parents Alex & Mary — first a head (b.~1899), then head of a 5-person household.
Age 41
b. ~1899
Male
Head
Born: North Dakota
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Pembina-County, North Dakota |
| Surname | Duncan |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 41 |
| Marital Status | Married |
| Birthplace | North Dakota |
| 1935 Residence (City) | Felson Township |
| 1935 Residence (County) | Pembina |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 48 |
| Income (1939) | 250 |
| Highest Grade | No 8 |
| 1935 Residence | Same house |
| Birth State | North Dakota |
| Birth Country | United States |
| Birthplace (normalized) | north dakota |
| Occupation | Farmer |
| Township / Ward | Felson Township |
| Est. Birth Year | ~1899 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| William Duncan | Head | — | 41 | ~1899 |
| Geneva Irwin | Other | — | 24 | ~1916 |
| James Duncan | Son | — | 14 | ~1926 |
| Duane Duncan | Son | — | 12 | ~1928 |
| J Duncan | Spouse | — | 38 | ~1902 |
Census Appearances
1920
Pembina, North …
Son, age 21
Pembina, North Dakota · implied b. ~1899 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | North Dakota |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Canada |
| Occupation | Farmer |
| Industry | General Farm |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | North Dakota |
| Birth Country | United States |
| Birthplace (normalized) | north dakota |
1930
Pembina, North …
Head, age 32
Pembina, North Dakota · implied b. ~1898 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | William R. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 32 |
| Marital Status | Married |
| Birthplace | North Dakota |
| Age at First Marriage | 26 |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Canada |
| Occupation | Farmer |
| Industry | General farm |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Birth State | North Dakota |
| Birth Country | United States |
| Birthplace (normalized) | north dakota |
1940
Pembina-County, North …
Head, age 41
Pembina-County, North Dakota · implied b. ~1899 — 5 household members
| Surname | Duncan |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 41 |
| Marital Status | Married |
| Birthplace | North Dakota |
| 1935 Residence (City) | Felson Township |
| 1935 Residence (County) | Pembina |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 48 |
| Income (1939) | 250 |
| Highest Grade | No 8 |
| 1935 Residence | Same house |
| Birth State | North Dakota |
| Birth Country | United States |
| Birthplace (normalized) | north dakota |
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 William Duncan across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Alex Duncan (~0.92 confidence) and mother Mary Duncan (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Alex Duncan
b. ~1859
Source father
● Household
· direct · ~0.92
Mother
Mary Duncan
b. ~1860
Source mother
● Household
· direct · ~0.92
This person
Anchor record
William Duncan
Head · 1940 · age 41 · b. ~1899 · North Dakota
★ 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 — Pembina-County, North Dakota
Open full size
1940 US Federal Census — Pembina-County, North Dakota
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03009-00211)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Lois Stegman | 6 | Daughter | — | North Dakota |
| 42 | Melvin Stegman | 5 | Son | — | North Dakota |
| 43 | George H. Horsley | 72 | Head | Farmer | Canada |
| 44 | Marguerite Horsley | 70 | Wife | — | Canada |
| 45 | Russell Horsley | 40 | Head | Farmer | North Dakota |
| 46 | Gertrude R. Horsley | 40 | Wife | — | North Dakota |
| 47 | Shirley Horsley | 10 | Daughter | — | North Dakota |
| 48 | Nina Horsley | 4 | Daughter | — | North Dakota |
| 49 | Bruno Cavalin | 50 | Head | Foreman | North Dakota |
| 50 | Rose R. Cavalin | 48 | Wife | — | North Dakota |
| 51 | Della Cavalin | 19 | Daughter | Servant | North Dakota |
| 52 | Delena Cavalin | 17 | Daughter | Servant | North Dakota |
| 53 | Dorelene Cavalin | 14 | Daughter | — | North Dakota |
| 54 | Edna Cavalin | 13 | Daughter | — | North Dakota |
| 55 | Marvin Cavalin | 10 | Son | — | North Dakota |
| 56 | Luciel Cavalin | 9 | Daughter | — | North Dakota |
| 57 | Marcella Cavalin | 8 | Daughter | — | North Dakota |
| 58 | Harold Ross | 32 | Head | Farmer | North Dakota |
| 59 | Amy Ross | 27 | Wife | — | North Dakota |
| 60 | Darlene Ross | 6 | Daughter | — | North Dakota |
| 61 | Joyce Ross | 2 | Daughter | — | North Dakota |
| 62 | Maurene Ross | 0 | Daughter | — | North Dakota |
| 63 | Mable Cavalin | 22 | Servant | Servant | North Dakota |
| 64 | Chester Symington | 27 | Head | Farmer | North Dakota |
| 65 | Winnie Symington | 27 | Wife | — | Minnesota |
| 66 | William Symington | 0 | Son | — | North Dakota |
| 67 | Lyle Symington | 49 | Head | Farmer | North Dakota |
| 68 | Ida Symington | 49 | Wife | — | North Dakota |
| 69 | Garth Symington | 20 | Son | — | North Dakota |
| 70 | Jean Symington | 15 | Daughter | — | North Dakota |
| 71 | Ruth Symington | 10 | Daughter | — | North Dakota |
| 72 | Gwen Symington | 9 | Daughter | — | North Dakota |
| 73 | Lois Symington | 5 | Daughter | — | North Dakota |
| 74 | Herbert Symington | 12 | Son | — | North Dakota |
| 75 | William Duncan THIS PERSON | 41 | Head | Farmer | North Dakota |
| 76 | J. Elizabeth Duncan | 38 | Wife | — | North Dakota |
| 77 | James Duncan | 14 | Son | — | North Dakota |
| 78 | Duane Duncan | 12 | Son | — | North Dakota |
| 79 | Geneva Irwin | 24 | Lodger | Instructor | North Dakota |
| 80 | Robert Noice | 71 | Head | Farmer | Canada |
Pedigree Summary
William
Gen 1 · 2 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)