MD
Mary Duke — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Vermilion-County, Illinois
Our Model Tree links this Mary Duke across the 1920, 1930 and 1940 US Censuses in Vermilion-County, Illinois (XGBoost, ~Confirmed) — first a spouse (b.~1884), then head of a 3-person household.
Age 56
b. ~1884
Female
Spouse
Born: Indiana
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Vermilion-County, Illinois |
| Surname | Duke |
| Given Name | Mary V |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 56 |
| Marital Status | Married |
| Birthplace | Indiana |
| 1935 Residence (City) | Fithian Village |
| 1935 Residence (County) | Vermilion |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | 8 |
| 1935 Residence | Same Place |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
| Township / Ward | Fithian Village |
| Est. Birth Year | ~1884 |
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 |
|---|---|---|---|---|
| Mary Duke | Spouse | — | 56 | ~1884 |
| Holly Duke | Head | — | 59 | ~1881 |
| Jr Duke | Son | — | 21 | ~1919 |
Census Appearances
1920
Vermilion, Illinois
Spouse, age 36
Vermilion, Illinois · implied b. ~1884 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duke |
| Given Name | Mary V. |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 36 |
| Marital Status | Married |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1930
Vermilion, Illinois
Other, age 46
Vermilion, Illinois · implied b. ~1884 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duke |
| Given Name | Mary V. |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 46 |
| Marital Status | Married |
| Birthplace | Indiana |
| Age at First Marriage | 23 |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Can Read/Write | Yes |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1940
Vermilion-County, Illinois
Spouse, age 56
Vermilion-County, Illinois · implied b. ~1884 — 3 household members
| Surname | Duke |
| Given Name | Mary V |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 56 |
| Marital Status | Married |
| Birthplace | Indiana |
| 1935 Residence (City) | Fithian Village |
| 1935 Residence (County) | Vermilion |
| Income (1939) | 0 |
| Highest Grade | 8 |
| 1935 Residence | Same Place |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
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 Duke across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Duke
Spouse · 1940 · age 56 · b. ~1884 · Illinois
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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 — Vermilion-County, Illinois
Open full size
1940 US Federal Census — Vermilion-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00899-00554)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Harold L Sullivan | 9 | Son | — | Illinois |
| 42 | Kenneth Jr Sullivan | 7 | Son | — | Illinois |
| 43 | Elma L Sullivan | 5 | Daughter | — | Illinois |
| 44 | Lulu D Eyestone | 59 | Head | — | Illinois |
| 45 | Robert R Eyestone | 17 | Son | — | Illinois |
| 46 | Ralph Morris | 43 | Head | Proprietor | Illinois |
| 47 | Sylvia D Morris | 44 | Wife | — | Illinois |
| 48 | Eugene M Morris | 23 | Son | Driver | Illinois |
| 49 | Beverly Morris | 12 | Daughter | — | Illinois |
| 50 | Sanford B Firebaugh | 66 | Head | — | Illinois |
| 51 | Virgie Firebaugh | 60 | Wife | — | Illinois |
| 52 | Holly E Duke | 59 | Head | Laborer | Illinois |
| 53 | Mary V Duke THIS PERSON | 56 | Wife | — | Indiana |
| 54 | Jr. Raymond Duke | 21 | Son | — | Illinois |
| 55 | Harry S Park | 51 | Head | Laborer | Michigan |
| 56 | Grace B Park | 44 | Wife | — | Illinois |
| 57 | Edward Powell | 71 | Lodger | — | Illinois |
| 58 | Sylvia Youmans | 46 | Head | — | Illinois |
| 59 | Wayne Youmans | 8 | Son | — | Illinois |
| 60 | Octavia Bailey | 70 | Head | — | Kentucky |
| 61 | Arnold Cromwell | 28 | Head | Clerk | Illinois |
| 62 | Erma Cromwell | 22 | Wife | — | Illinois |
| 63 | Sherman Musson | 62 | Head | Laborer | Illinois |
| 64 | Stella Musson | 57 | Wife | — | Illinois |
| 65 | Orville Musson | 37 | Son | — | Illinois |
| 66 | Earl Musson | 20 | Son | Laborer | Illinois |
| 67 | Lemuel Jr Sartain | 68 | Head | — | Kentucky |
| 68 | Bonnie Sartain | 58 | Wife | — | Kentucky |
| 69 | Ruth Sartain | 33 | Daughter | Assistant Postmistress | Illinois |
| 70 | John R Sartain | 10 | Grandson | — | Illinois |
| 71 | Hattie Smith | 74 | Head | — | Illinois |
| 72 | Mossie Thomason | 63 | Head | Farmer | Kentucky |
| 73 | Susie Thomason | 63 | Wife | — | Kentucky |
| 74 | Paul A Thomason | 23 | Son | Driver | Kentucky |
| 75 | Chester Thomason | 18 | Son | Laborer | Illinois |
| 76 | Effie Thomason | 16 | Daughter | — | Illinois |
| 77 | Kathryn Thomason | 16 | Daughter | — | Illinois |
| 78 | Jane Hays | 32 | Head | — | Illinois |
| 79 | Rufus Thomason | 59 | Head | Laborer | Kentucky |
| 80 | Willie Girl Thomason | 51 | Wife | — | Kentucky |
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)