WD
William Duncan — 1940 US Census Record
Model Tree available1940 United States Federal Census · Richland-County, Montana
Our Model Tree links this William Duncan across the 1920, 1930 and 1940 US Censuses in Richland-County, Montana (XGBoost, ~Confirmed), with identified parents William & Martha — first a head (b.~1906), then head of a 3-person household.
Age 34
b. ~1906
Male
Head
Born: Oklahoma
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Richland-County, Montana |
| Surname | Duncan |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 34 |
| Marital Status | Married |
| Birthplace | Oklahoma |
| 1935 Residence (City) | Richland |
| 1935 Residence (County) | Richland |
| Additional Details | |
| Occupation | Farm Laborer |
| Industry | Farm |
| Class of Worker | PW |
| Hours Worked | 2 |
| Income (1939) | 480 |
| Highest Grade | Hs 4 |
| 1935 Residence | Montana |
| Birth State | Oklahoma |
| Birth Country | United States |
| Birthplace (normalized) | oklahoma |
| Occupation | Farm Laborer |
| Township / Ward | Sidney City |
| Est. Birth Year | ~1906 |
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 William | Age | Birth yr |
|---|---|---|---|---|
| Elmina Duncan | Daughter | — | 1 | ~1939 |
| William Duncan | Head | — | 34 | ~1906 |
| Merla Duncan | Spouse | — | 24 | ~1916 |
Census Appearances
1920
Richland, Montana
Son, age 14
Richland, Montana · implied b. ~1906 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | William F. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Oklahoma |
| Father's Birthplace | Oklahoma |
| Mother's Birthplace | Oklahoma |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Oklahoma |
| Birth Country | United States |
| Birthplace (normalized) | oklahoma |
1930
Richland, Montana
Son, age 23
Richland, Montana · implied b. ~1907 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | William F. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Oklahoma |
| Father's Birthplace | Oklahoma |
| Mother's Birthplace | Oklahoma |
| Occupation | Laborer |
| Industry | Farm |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Oklahoma |
| Birth Country | United States |
| Birthplace (normalized) | oklahoma |
1940
Richland-County, Montana
Head, age 34
Richland-County, Montana · implied b. ~1906 — 3 household members
| Surname | Duncan |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 34 |
| Marital Status | Married |
| Birthplace | Oklahoma |
| 1935 Residence (City) | Richland |
| 1935 Residence (County) | Richland |
| Occupation | Farm Laborer |
| Industry | Farm |
| Class of Worker | PW |
| Hours Worked | 2 |
| Income (1939) | 480 |
| Highest Grade | Hs 4 |
| 1935 Residence | Montana |
| Birth State | Oklahoma |
| Birth Country | United States |
| Birthplace (normalized) | oklahoma |
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 William Duncan (~0.92 confidence) and mother Martha Duncan (~0.92 confidence) and father William Duncan (~0.50 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.78
Father
William Duncan
b. ~1872
Source father
● Household
· direct · ~0.92
Mother
Martha Duncan
b. ~1877
Source mother
● Household
· direct · ~0.92
Father
William Duncan
b. ~1909
Source father
● Household
· direct · ~0.5
This person
Anchor record
William Duncan
Head · 1940 · age 34 · b. ~1906 · Montana
★ 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 — Richland-County, Montana
Open full size
1940 US Federal Census — Richland-County, Montana
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02228-00029)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | William Duncan THIS PERSON | 34 | Head | Farm Laborer | Oklahoma |
| 42 | Merla Duncan | 24 | Wife | — | North Dakota |
| 43 | Elmina Duncan | 1 | Daughter | — | Montana |
| 44 | Henry Dooley | 44 | Head | Truck Driver | Missouri |
| 45 | Goldie Dooley | 41 | Wife | — | Nebraska |
| 46 | Orville Dooley | 20 | Son | Laborer | Montana |
| 47 | Floyd Dooley | 14 | Son | — | Montana |
| 48 | Raymond Pickett | 30 | Head | Laborer | Nebraska |
| 49 | Annie B. Pickett | 27 | Wife | — | Canada |
| 50 | Florence Pickett | 10 | Daughter | — | Colorado |
| 51 | Patricia A. Pickett | 4 | Daughter | — | Montana |
| 52 | Charlotte Pickett | 2 | Daughter | — | Montana |
| 53 | Janet R. Pickett | 1 | Daughter | — | Montana |
| 54 | Elizabeth Knels | 32 | Head | — | Russia |
| 55 | Joan Knels | 5 | Daughter | — | Montana |
| 56 | Betty Knels | 4 | Daughter | — | Montana |
| 57 | Vera Knels | 1 | Daughter | — | Montana |
| 58 | Harold Christensen | 30 | Head | Salesman | North Dakota |
| 59 | Lenore Christensen | 27 | Wife | — | Minnesota |
| 60 | Richard Christensen | 2 | Son | — | Montana |
| 61 | Gerald Christensen | 1 | Son | — | Montana |
| 62 | Janice Christensen | 1 | Daughter | — | Montana |
| 63 | Vernie B. Small | 24 | Head | Door Man | Montana |
| 64 | Leona Small | 20 | Wife | — | Montana |
| 65 | Donna Lee Small | 3 | Daughter | — | Montana |
| 66 | Albert L. Teeters | 44 | Head | Steam Engineer | Missouri |
| 67 | Mable Teeters | 41 | Wife | — | Missouri |
| 68 | Merle Teeters | 24 | Son | Laborer | Colorado |
| 69 | Mervyn Teeters | 19 | Son | New Worker | Colorado |
| 70 | Mildred Teeters | 18 | Daughter | — | Colorado |
| 71 | Marion Teeters | 16 | Son | — | Colorado |
| 72 | Madine Teeters | 15 | Daughter | — | Colorado |
| 73 | Mary Teeters | 11 | Daughter | — | Montana |
| 74 | Marjorie Teeters | 6 | Daughter | — | Montana |
| 75 | Silas L. Casey | 61 | Head | Junior Timekeeper | Minnesota |
| 76 | Grace Casey | 33 | Wife | — | North Dakota |
| 77 | Russell Casey | 13 | Son | — | Montana |
| 78 | Peggy Casey | 9 | Daughter | — | Montana |
| 79 | Phyllis Casey | 6 | Daughter | — | Montana |
| 80 | Donna Casey | 3 | Daughter | — | Montana |
Pedigree Summary
William
Gen 1 · 3 parents
~0.78
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)