MD
Mary Duncan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Henry-County, Missouri
Our Model Tree links this Mary Duncan across the 1920, 1930 and 1940 US Censuses in Henry-County, Missouri (XGBoost, ~Confirmed) — first a spouse (b.~1873), then head of a 3-person household.
Age 67
b. ~1873
Female
Spouse
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Henry-County, Missouri |
| Surname | Duncan |
| Given Name | Mary A |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 67 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Clinton |
| 1935 Residence (County) | Henry |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Clinton |
| Est. Birth Year | ~1873 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| William Duncan | Head | — | 82 | ~1858 |
| Robert Duncan | Son | — | 30 | ~1910 |
| Mary Duncan | Spouse | — | 67 | ~1873 |
Census Appearances
1920
Henry, Missouri
Spouse, age 44
Henry, Missouri · implied b. ~1876 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | Mary A. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 44 |
| Marital Status | Married |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Kentucky |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Henry, Missouri
Spouse, age 57
Henry, Missouri · implied b. ~1873 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | Mary A. |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 57 |
| Marital Status | Married |
| Birthplace | Illinois |
| Age at First Marriage | 24 |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Kentucky |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Henry-County, Missouri
Spouse, age 67
Henry-County, Missouri · implied b. ~1873 — 3 household members
| Surname | Duncan |
| Given Name | Mary A |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 67 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Clinton |
| 1935 Residence (County) | Henry |
| Income (1939) | 0 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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.
Show:
This person
Anchor record
Mary Duncan
Spouse · 1940 · age 67 · b. ~1873 · Missouri
★ 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 — Henry-County, Missouri
Open full size
1940 US Federal Census — Henry-County, Missouri
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02111-00204)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Reava E Heath | 29 | Lodger | Home Supervisor | Missouri |
| 42 | Alonzo Parker | 40 | Head | Manager | Missouri |
| 43 | Fay Parker | 39 | Wife | — | Missouri |
| 44 | Audrey Parker | 15 | Daughter | — | Missouri |
| 45 | Clayton Hood | 21 | Head | Presser | Missouri |
| 46 | Frances Hood | 18 | Wife | — | Kansas |
| 47 | Homer Dalton | 42 | Head | Fireman | Missouri |
| 48 | Addie Dalton | 37 | Wife | — | Missouri |
| 49 | James L Dalton | 17 | Son | — | Missouri |
| 50 | Harold Martin | 19 | Head | Hatchery | Missouri |
| 51 | Mary J Martin | 18 | Wife | Hatchery | Missouri |
| 52 | Jacob D Miller | 56 | Head | Teacher | Missouri |
| 53 | Nancy Miller | 52 | Wife | — | Missouri |
| 54 | Carrie Maing | 57 | Head | — | Missouri |
| 55 | James Smith | 33 | Head | Medical Doctor | Missouri |
| 56 | Martha Smith | 34 | Wife | — | Missouri |
| 57 | Sharon S Smith | 3 | Daughter | — | Missouri |
| 58 | Martha M Goodrich | 20 | Housekeeper | Housekeeping | Missouri |
| 59 | William Duncan | 82 | Head | — | Missouri |
| 60 | Mary A Duncan THIS PERSON | 67 | Wife | — | Illinois |
| 61 | Robert Duncan | 30 | Son | Collector | Missouri |
| 62 | Virgil Covington | 55 | Head | Laborer | Missouri |
| 63 | Mary E Covington | 42 | Wife | — | Missouri |
| 64 | Louisa Covington | 25 | Daughter | Teacher | Missouri |
| 65 | Margaret Covington | 22 | Daughter | Teacher | Missouri |
| 66 | Basil Webb | 23 | Head | Office Manager | Missouri |
| 67 | Velma Webb | 21 | Wife | — | Missouri |
| 68 | Basil Jr Webb | 0 | Son | — | Missouri |
| 69 | Kathryn Webb | 40 | Mother | Authoress | Missouri |
| 70 | Berenice Webb | 19 | Sister | Clerical | Missouri |
| 71 | Co-Tan Webb | 9 | Sister | — | Missouri |
| 72 | James Bailey | 65 | Head | Carpenter | Missouri |
| 73 | Dora Bailey | 64 | Wife | — | Missouri |
| 74 | Walter Bailey | 43 | Son | Laborer | Missouri |
| 75 | Thelma Bailey | 26 | Daughter | — | Missouri |
| 76 | John Wilkinson | 62 | Head | Painter | Missouri |
| 77 | Nellie Wilkinson | 57 | Wife | — | Kansas |
| 78 | Jewell Wilkinson | 30 | Daughter | Clerical | Missouri |
| 79 | Clifford Wilkinson | 26 | Son | — | Missouri |
| 80 | Owen Sherman | 16 | Grandson | — | Missouri |
Related Census Records
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)