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Mary Willis — 1940 US Census Record
Linked across censuses1940 United States Federal Census · St.-Louis-County, Missouri
Our Model Tree links this Mary Willis across the 1930 and 1940 US Censuses in St.-Louis-County, Missouri (XGBoost, ~Confirmed) — first a daughter (b.~1929), then head of a 10-person household.
Age 11
b. ~1929
Female
Daughter
Born: Missouri
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | St.-Louis-County, Missouri |
| Surname | Willis |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Missouri |
| 1935 Residence (City) | Richmond Heights |
| 1935 Residence (County) | St. Louis |
| Additional Details | |
| Highest Grade | 5 |
| 1935 Residence | Same Place |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
| Township / Ward | Richmond Heights |
| Est. Birth Year | ~1929 |
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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Willis | Daughter | — | 11 | ~1929 |
| Dora Willis | Daughter | — | 8 | ~1932 |
| Betty Willis | Daughter | — | 4 | ~1936 |
| Ruby Willis | Daughter | — | 6 | ~1934 |
| Albert Willis | Head | — | 33 | ~1907 |
| E Willis | Son | — | 17 | ~1923 |
| Eddie Willis | Son | — | 12 | ~1928 |
| Isaac Willis | Son | — | 10 | ~1930 |
| James Willis | Son | — | 14 | ~1926 |
| Emma Willis | Spouse | — | 33 | ~1907 |
Census Appearances
1930
St Louis, …
Daughter, age 1
St Louis, Missouri · implied b. ~1929 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Willis |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Missouri |
| Father's Birthplace | Arkansas |
| Mother's Birthplace | Louisiana |
| Can Read/Write | Yes |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
1940
St.-Louis-County, Missouri
Daughter, age 11
St.-Louis-County, Missouri · implied b. ~1929 — 10 household members
| Surname | Willis |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Missouri |
| 1935 Residence (City) | Richmond Heights |
| 1935 Residence (County) | St. Louis |
| Highest Grade | 5 |
| 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 Willis across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Willis
Daughter · 1940 · age 11 · b. ~1929 · Missouri
★ You are viewing this record
Sibling
Isaac Willis
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eddie Willis
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
E Willis
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Betty Willis
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Willis
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dora Willis
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ruby Willis
Sibling · 1940 · age 6
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 — St.-Louis-County, Missouri
Open full size
1940 US Federal Census — St.-Louis-County, Missouri
Page Contents
37 people indexed on this census page (nara:1940:m-t0627-02150-01031)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | James Mcfadden | 9 | Head | — | Illinois |
| 42 | Isaac Johnson | 49 | Head | General Hauling | Missouri |
| 43 | Marietta Johnson | 49 | Wife | — | Missouri |
| 45 | Israel Jackson | 25 | Head | Gardner | Missouri |
| 46 | Corine Jackson | 28 | Wife | — | Tennessee |
| 47 | Gertrude Jackson | 65 | Mother | — | Mississippi |
| 48 | Barbara Bedford | 11 | Daughter | — | Missouri |
| 50 | Monroe Williams | 31 | Head | Truck Driver | Arkansas |
| 51 | Blanche Williams | 24 | Sister | Maid | Arkansas |
| 52 | Albert Willis | 33 | Head | Laborer | Arkansas |
| 53 | Emma Willis | 33 | Wife | — | Arkansas |
| 54 | E. C. Willis | 17 | Son | — | Arkansas |
| 55 | James Willis | 14 | Son | — | Arkansas |
| 56 | Eddie Willis | 12 | Son | — | Missouri |
| 57 | Mary Willis THIS PERSON | 11 | Daughter | — | Missouri |
| 58 | Isaac Willis | 10 | Son | — | Missouri |
| 59 | Dora Willis | 8 | Daughter | — | Missouri |
| 60 | Ruby May Willis | 6 | Daughter | — | Missouri |
| 61 | Betty Jane Willis | 4 | Daughter | — | Missouri |
| 62 | King Parsons | 45 | Head | Gardner | Missouri |
| 63 | Viola Parsons | 22 | Daughter | Maid | Missouri |
| 64 | Milton Wade Powell | 12 | Grandson | — | Missouri |
| 65 | Isaiah Sanders | 35 | Head | Car Cleaner | Arkansas |
| 66 | Almeta Sanders | 33 | Wife | — | Oklahoma |
| 67 | Robert, Robert Sanders | 12 | Son | — | Missouri |
| 68 | Edward Sanders | 10 | Son | — | Missouri |
| 70 | Clarence Lee | 34 | Head | Molder | Mississippi |
| 71 | Lillian Lee | 31 | Wife | — | Tennessee |
| 72 | Virginia Lee | 15 | Daughter | — | Missouri |
| 73 | Henrietta Lee | 13 | Daughter | — | Missouri |
| 74 | Lillian Beatrice Lee | 9 | Daughter | — | Missouri |
| 75 | Clarence Jr. Lee | 7 | Son | — | Missouri |
| 76 | Deloris Lee | 5 | Daughter | — | Missouri |
| 77 | Alice Lee | 1 | Daughter | — | Missouri |
| 78 | George Cook | 54 | Head | Molder | Alabama |
| 79 | Eliza Cook | 43 | Wife | — | Alabama |
| 80 | Mary Elizabeth Cook | 16 | Daughter | — | Ohio |
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)