WD
William Duncan — 1940 US Census Record
Model Tree available1940 United States Federal Census · Lawrence-County, Pennsylvania
Our Model Tree links this William Duncan across the 1920, 1930 and 1940 US Censuses in Lawrence-County, Pennsylvania (XGBoost, ~Confirmed), with identified parents William & William — first a son (b.~1911), then head of a 12-person household.
Age 29
b. ~1911
Male
Son
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Lawrence-County, Pennsylvania |
| Surname | Duncan |
| Given Name | William L. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Perry Twp. |
| 1935 Residence (County) | Lawrence |
| Additional Details | |
| Industry | Farmer |
| Class of Worker | Farm |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Township / Ward | Perry Twp |
| Est. Birth Year | ~1911 |
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.
12 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Evalyn Duncan | Daughter | — | 22 | ~1918 |
| Vicki Bishop | Daughter | — | 1 | ~1939 |
| Margie Duncan | Daughter | — | 17 | ~1923 |
| Mabel Bishop | Daughter | — | 25 | ~1915 |
| Paul Duncan | Head | — | 44 | ~1896 |
| Emma Gallaher | Other | — | 73 | ~1867 |
| Miles Bishop | Other | — | 25 | ~1915 |
| Jack Duncan | Son | — | 16 | ~1924 |
| Gary Bishop | Son | — | 3 | ~1937 |
| William Duncan | Son | — | 29 | ~1911 |
| Edward Duncan | Son | — | 20 | ~1920 |
| Alfred Duncan | Son | — | 11 | ~1929 |
Census Appearances
1920
Lawrence, Pennsylvania
Son, age 8
Lawrence, Pennsylvania · implied b. ~1912 — 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 | 8 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
Lawrence, Pennsylvania
Son, age 18
Lawrence, Pennsylvania · implied b. ~1912 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | William L |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Occupation | Laborer |
| Industry | Tube Mill |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Lawrence-County, Pennsylvania
Son, age 29
Lawrence-County, Pennsylvania · implied b. ~1911 — 12 household members
| Surname | Duncan |
| Given Name | William L. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Perry Twp. |
| 1935 Residence (County) | Lawrence |
| Industry | Farmer |
| Class of Worker | Farm |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
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 father William Duncan (~0.92 confidence) and mother Bessie Duncan (~0.92 confidence) and father Paul Duncan (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
William Duncan
b. ~1889
Source father
● Household
· direct · ~0.92
Father
William Duncan
b. ~1889
Source father
● Household
· direct · ~0.92
Mother
Bessie Duncan
b. ~1892
Source mother
● Household
· direct · ~0.92
Father
Paul Duncan
b. ~1896
Source father
● Household
· direct · ~0.92
This person
Anchor record
William Duncan
Son · 1940 · age 29 · b. ~1911 · Pennsylvania
★ You are viewing this record
Sibling
Alfred Duncan
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Duncan
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mabel Bishop
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Gary Bishop
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Evalyn Duncan
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Vicki Bishop
Sibling · 1940 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margie Duncan
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jack Duncan
Sibling · 1940 · age 16
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 — Lawrence-County, Pennsylvania
Open full size
1940 US Federal Census — Lawrence-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03539-00129)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Donald W. Majors | 1 | Son | — | — |
| 2 | Robert W. Mckee | 26 | Head | Truck Driver | Pennsylvania |
| 3 | Esther P. Mckee | 22 | Wife | — | Pennsylvania |
| 4 | Carolyn J. Mckee | 0 | Daughter | — | — |
| 5 | Harry R. Miller | 45 | Head | Mill Laborer | Pennsylvania |
| 6 | Bertha B. Miller | 49 | Wife | — | Pennsylvania |
| 7 | Harold A. Miller | 23 | Son | Laborer | Pennsylvania |
| 8 | Ray W. Miller | 20 | Son | — | Pennsylvania |
| 9 | Joseph M. Miller | 25 | Head | Laborer | Pennsylvania |
| 10 | Adeline Miller | 25 | Wife | — | Pennsylvania |
| 11 | Donna Jean Miller | 2 | Daughter | — | — |
| 12 | Harry E. Miller | 63 | Head | Farmer | Pennsylvania |
| 13 | Mary E. Miller | 61 | Wife | — | Ohio |
| 14 | Alexander Posa | 52 | Head | Fireman | Hungary |
| 15 | Mary Posa | 47 | Wife | — | Hungary |
| 16 | Louis Posa | 26 | Son | Blacksmith | Pennsylvania |
| 17 | Rose Irene Posa | 21 | Daughter | — | Pennsylvania |
| 18 | William A. Posa | 14 | Son | — | Pennsylvania |
| 19 | William J. Douglass | 72 | Head | — | Pennsylvania |
| 20 | Olive J. Douglass | 55 | Sister | — | Pennsylvania |
| 21 | Charles V. Foreman | 56 | Head | Farmer | Pennsylvania |
| 22 | Mettie E. Foreman | 51 | Sister | — | Pennsylvania |
| 23 | Paul F. Duncan | 44 | Head | — | Ohio |
| 24 | William L. Duncan THIS PERSON | 29 | Son | — | Pennsylvania |
| 25 | Evalyn R. Duncan | 22 | Daughter | Housework | Pennsylvania |
| 26 | Edward J. Duncan | 20 | Son | — | Pennsylvania |
| 27 | Margie L. Duncan | 17 | Daughter | — | Pennsylvania |
| 28 | Jack J. Duncan | 16 | Son | — | Pennsylvania |
| 29 | Alfred B. Duncan | 11 | Son | — | Pennsylvania |
| 30 | Miles M. Bishop | 25 | Son-in-law | Laborer | Pennsylvania |
| 31 | Mabel E. Bishop | 25 | Daughter | — | Pennsylvania |
| 32 | Gary M. Bishop | 3 | Son | — | — |
| 33 | Vicki J. Bishop | 1 | Daughter | — | — |
| 34 | Emma Gallaher | 73 | Mother-in-law | — | Pennsylvania |
| 35 | Ira J. Baxter | 32 | Head | Laborer | Pennsylvania |
| 36 | Verna M. Baxter | 30 | Wife | — | Pennsylvania |
| 37 | Alvin J. Baxter | 12 | Son | — | Pennsylvania |
| 38 | Lester J. Miller | 33 | Head | Farmer | Pennsylvania |
| 39 | Alma R. Miller | 60 | Wife | — | Pennsylvania |
| 40 | Geraldine Miller | 26 | Daughter | — | Pennsylvania |
Pedigree Summary
William + 8 siblings
Gen 1 · 4 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)