MD
Mary Duncan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Dekalb-County, Missouri
Our Model Tree links this Mary Duncan across the 1920, 1930 and 1940 US Censuses in Dekalb-County, Missouri (XGBoost, ~Confirmed) — first a head (b.~1859), then head of a 2-person household.
Age 81
b. ~1859
Female
Head
Born: Missouri
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Dekalb-County, Missouri |
| Surname | Duncan |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 81 |
| Marital Status | Widowed |
| Birthplace | Missouri |
| 1935 Residence (City) | Maysville city |
| 1935 Residence (County) | DeKalb |
| Additional Details | |
| Class of Worker | 0 |
| Hours Worked | 0 |
| Highest Grade | Th 8 |
| 1935 Residence | Same place |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
| Township / Ward | Maysville City |
| Est. Birth Year | ~1859 |
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.
2 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| May Duncan | Daughter | — | 55 | ~1885 |
| Mary Duncan | Head | — | 81 | ~1859 |
Census Appearances
1920
Dekalb, Missouri
Head, age 60
Dekalb, Missouri · implied b. ~1860 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | Mary S. |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 60 |
| Marital Status | Widowed |
| Birthplace | Missouri |
| Father's Birthplace | Virginia |
| Mother's Birthplace | Tennessee |
| Can Read | Yes |
| Can Write | Yes |
| Home Owned/Rented | O |
| Home Free/Mortgaged | F |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
1930
Dekalb, Missouri
Other, age 71
Dekalb, Missouri · implied b. ~1859 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | Mary S. |
| Relationship to Head | H |
| Sex | F |
| Color / Race | White |
| Age | 71 |
| Marital Status | Widowed |
| Birthplace | Missouri |
| Father's Birthplace | Virginia |
| Mother's Birthplace | Indiana |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 3000 |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
1940
Dekalb-County, Missouri
Head, age 81
Dekalb-County, Missouri · implied b. ~1859 — 2 household members
| Surname | Duncan |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 81 |
| Marital Status | Widowed |
| Birthplace | Missouri |
| 1935 Residence (City) | Maysville city |
| 1935 Residence (County) | DeKalb |
| Class of Worker | 0 |
| Hours Worked | 0 |
| Highest Grade | Th 8 |
| 1935 Residence | Same place |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
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
Head · 1940 · age 81 · b. ~1859 · 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 — Dekalb-County, Missouri
Open full size
1940 US Federal Census — Dekalb-County, Missouri
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02102-00464)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Carolyn Harvey | 65 | Daughter | — | Missouri |
| 2 | Mary Duncan THIS PERSON | 81 | Head | — | Missouri |
| 3 | May Duncan | 55 | Daughter | — | Missouri |
| 4 | Edmond W. Church | 67 | Head | — | Missouri |
| 5 | Lydia Church | 67 | Wife | — | Iowa |
| 6 | George A. Mclean | 55 | Head | Druggist | Canada |
| 7 | Bont Mclean | 57 | Wife | — | Missouri |
| 8 | G. W. Mclean | 17 | Son | — | Missouri |
| 9 | Velma Runky | 22 | Niece | Housekeeper | Missouri |
| 10 | Earber E. Mcmorris | 48 | Head | Cashier | Missouri |
| 11 | Edna Mcmorris | 25 | Wife | Bookkeeper | Missouri |
| 12 | Jennie Riggs | 69 | Head | — | Missouri |
| 13 | Gertrude Winter | 60 | Sister | — | Missouri |
| 14 | Clyde Tebow | 35 | Head | Maintenance Patrolman | Missouri |
| 15 | Lila Tebow | 33 | Wife | — | Missouri |
| 16 | Nadine Tebow | 15 | Daughter | — | Missouri |
| 17 | Phyllis Tebow | 5 | Daughter | — | Missouri |
| 18 | Cleo Tebow | 2 | Son | — | Missouri |
| 19 | John C. Schultz | 43 | Head | Mechanic | Missouri |
| 20 | Alpha Schultz | 32 | Wife | — | Iowa |
| 21 | Lilah B. White | 67 | Head | — | Missouri |
| 22 | Grover C. Miller | 46 | Head | Dealer | Missouri |
| 23 | Laura Miller | 43 | Wife | — | Missouri |
| 24 | Harold Miller | 25 | Son | Lawyer | Missouri |
| 25 | Carmil Miller | 20 | Son | — | Missouri |
| 26 | Estel Miller | 18 | Son | — | Missouri |
| 27 | Dayle Miller | 16 | Son | — | Missouri |
| 28 | Thur Miller | 11 | Son | — | Missouri |
| 29 | Ed Denzel | 51 | Lodger | Druggist | Kansas |
| 30 | Bessie Denzel | 51 | Lodger | Saleslady | Missouri |
| 31 | Ben P. Eden | 59 | Head | — | Missouri |
| 32 | Juanita M. Eden | 38 | Wife | — | Nebraska |
| 33 | Gene Weir Eden | 13 | Son | — | Missouri |
| 34 | Alfred C. Combs | 41 | Head | Junior Mechanic | Missouri |
| 35 | Madge A. Combs | 41 | Wife | — | Missouri |
| 36 | Charles Combs | 16 | Son | — | Missouri |
| 37 | Ardena Combs | 14 | Daughter | — | Missouri |
| 38 | A. M. Quigley | 46 | Head | Proprietor Operator | Missouri |
| 39 | Abbey Marie Quigley | 44 | Wife | — | Missouri |
| 40 | C. M. Jr. Quigley | 23 | Son | — | Missouri |
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)