MD
Mary Duncan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Mercer-County, West Virginia
Our Model Tree links this Mary Duncan across the 1920, 1930 and 1940 US Censuses in Mercer-County, West Virginia (XGBoost, ~Confirmed) — first a spouse (b.~1882), then head of a 4-person household.
Age 58
b. ~1882
Female
Spouse
Born: North Carolina
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Mercer-County, West Virginia |
| Surname | Duncan |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 58 |
| Marital Status | Married |
| Birthplace | North Carolina |
| 1935 Residence (City) | Rock District |
| 1935 Residence (County) | Mercer |
| Additional Details | |
| Highest Grade | No 4 |
| 1935 Residence | Same place |
| Birth State | North Carolina |
| Birth Country | United States |
| Birthplace (normalized) | north carolina |
| Township / Ward | Rock District |
| Est. Birth Year | ~1882 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Donald Duncan | Head | — | 63 | ~1877 |
| Donald Duncan | Son | — | 12 | ~1928 |
| Charlie Duncan | Son | — | 19 | ~1921 |
| Mary Duncan | Spouse | — | 58 | ~1882 |
Census Appearances
1920
Mercer, West …
Spouse, age 36
Mercer, West Virginia · implied b. ~1884 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 36 |
| Marital Status | Married |
| Birthplace | North Carolina |
| Father's Birthplace | North Carolina |
| Mother's Birthplace | North Carolina |
| Occupation | Dressmaker |
| Industry | at home |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | North Carolina |
| Birth Country | United States |
| Birthplace (normalized) | north carolina |
1930
Mercer, West …
Spouse, age 48
Mercer, West Virginia · implied b. ~1882 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | Mary S |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 48 |
| Marital Status | Married |
| Birthplace | North Carolina |
| Age at First Marriage | 17 |
| Father's Birthplace | North Carolina |
| Mother's Birthplace | North Carolina |
| Can Read/Write | Yes |
| Birth State | North Carolina |
| Birth Country | United States |
| Birthplace (normalized) | north carolina |
1940
Mercer-County, West …
Spouse, age 58
Mercer-County, West Virginia · implied b. ~1882 — 4 household members
| Surname | Duncan |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 58 |
| Marital Status | Married |
| Birthplace | North Carolina |
| 1935 Residence (City) | Rock District |
| 1935 Residence (County) | Mercer |
| Highest Grade | No 4 |
| 1935 Residence | Same place |
| Birth State | North Carolina |
| Birth Country | United States |
| Birthplace (normalized) | north carolina |
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 Mary 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
Mary Duncan
Spouse · 1940 · age 58 · b. ~1882 · West 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 — Mercer-County, West Virginia
Open full size
1940 US Federal Census — Mercer-County, West Virginia
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-04429-00746)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Mildred A. Campbell | 6 | Daughter | — | North Carolina |
| 42 | Lois Campbell | 4 | Daughter | — | North Carolina |
| 43 | Charley H. Ashland | 40 | Head | Laborer | Virginia |
| 44 | Daisy A. Ashland | 26 | Wife | — | Virginia |
| 45 | Ray Rider | 26 | Boarder | Miner | Virginia |
| 46 | William M. Smith | 46 | Head | Merchant | North Carolina |
| 47 | Hassie L. Smith | 38 | Wife | Clerk | North Carolina |
| 48 | James Smith | 21 | Son | Miner | West Virginia |
| 49 | Basil Smith | 17 | Son | — | West Virginia |
| 50 | Eva E. Smith | 14 | Daughter | — | West Virginia |
| 51 | Betty L. Smith | 4 | Daughter | — | West Virginia |
| 52 | Donald Duncan | 63 | Head | Merchant | North Carolina |
| 53 | Mary Duncan THIS PERSON | 58 | Wife | — | North Carolina |
| 54 | Charlie Jr. Duncan | 19 | Son | New Work | West Virginia |
| 55 | Donald Duncan | 12 | Son | — | West Virginia |
| 56 | Toy W. Bowen | 42 | Head | Trackman | North Carolina |
| 57 | Nora A. Bowen | 38 | Wife | — | West Virginia |
| 58 | Rupert C. Bowen | 20 | Son | — | West Virginia |
| 59 | Tiff Bowen | 18 | Son | Ball Player | West Virginia |
| 60 | Hester Bowen | 13 | Daughter | — | West Virginia |
| 61 | Audrey Bowen | 11 | Daughter | — | West Virginia |
| 62 | Bobby Bowen | 8 | Son | — | West Virginia |
| 63 | Betty Bowen | 4 | Daughter | — | West Virginia |
| 64 | Kenneth Bowen | 1 | Son | — | West Virginia |
| 65 | Edward W. Gearheart | 29 | Head | — | West Virginia |
| 66 | Elizabeth Gearheart | 25 | Wife | — | West Virginia |
| 67 | William Gearheart | 7 | Son | — | West Virginia |
| 68 | Edward Jr. Gearheart | 5 | Son | — | West Virginia |
| 69 | Jetta M. Gearheart | 3 | Daughter | — | West Virginia |
| 70 | Thomas J. Gearheart | 1 | Son | — | West Virginia |
| 71 | Mattie V. Rose | 24 | Sister in law | — | West Virginia |
| 72 | Huston Lidonna | 48 | Head | Trackman | Virginia |
| 73 | Lena L. Lidonna | 42 | Wife | — | North Carolina |
| 74 | Helen M. Lidonna | 23 | Daughter | — | West Virginia |
| 75 | Jack Lidonna | 21 | Son | Miner | West Virginia |
| 76 | Arthur A. Lidonna | 19 | Son | Miner | West Virginia |
| 77 | Jessie M. Lidonna | 17 | Son | New Work | West Virginia |
| 78 | Opal M. Lidonna | 15 | Daughter | — | West Virginia |
| 79 | Melburn E. Lidonna | 12 | Son | — | West Virginia |
| 80 | Luster Lidonna | 10 | Son | — | West 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)