MC
Mary Clarke — 1940 US Census Record
Linked across censuses1940 United States Federal Census · St.-Louis-County, Missouri
Our Model Tree links this Mary Clarke across the 1930 and 1940 US Censuses in St.-Louis-County, Missouri (XGBoost, ~Confirmed) — first a daughter (b.~1922), then head of a 6-person household.
Age 18
b. ~1922
Female
Daughter
Born: Missouri
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | St.-Louis-County, Missouri |
| Surname | Clarke |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Missouri |
| 1935 Residence (City) | Webster Groves City |
| 1935 Residence (County) | St. Louis |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | H 4 |
| 1935 Residence | Same Place |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
| Township / Ward | Webster Groves City |
| Est. Birth Year | ~1922 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Charles Clarke | Son | — | 15 | ~1925 |
| Alice Clarke | Head | — | 49 | ~1891 |
| Mary Clarke | Daughter | — | 18 | ~1922 |
| Walter Clarke | Son | — | 13 | ~1927 |
| William Clarke | Son | — | 20 | ~1920 |
| Alice Clarke | Daughter | — | 22 | ~1918 |
Census Appearances
1930
St Louis, …
Daughter, age 8
St Louis, Missouri · implied b. ~1922 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clarke |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Missouri |
| Age at First Marriage | 8 |
| Father's Birthplace | Arkansas |
| Mother's Birthplace | Indiana |
| Can Read/Write | Yes |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
1940
St.-Louis-County, Missouri
Daughter, age 18
St.-Louis-County, Missouri · implied b. ~1922 — 6 household members
| Surname | Clarke |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Missouri |
| 1935 Residence (City) | Webster Groves City |
| 1935 Residence (County) | St. Louis |
| Income (1939) | 0 |
| Highest Grade | H 4 |
| 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 Clarke across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Clarke
Daughter · 1940 · age 18 · b. ~1922 · Missouri
★ You are viewing this record
Sibling
Charles Clarke
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Walter Clarke
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Clarke
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Alice Clarke
Sibling · 1940 · age 22
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
40 people indexed on this census page (nara:1940:m-t0627-02149-00522)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Robert Harris Jr. Cobb | 41 | Head | Stock Broker | Missouri |
| 42 | Lucille S. Cobb | 36 | Wife | — | Missouri |
| 43 | Robert H. Jr. Cobb | 11 | Son | — | Missouri |
| 44 | Christopher Cobb | 10 | Son | — | Missouri |
| 45 | Michael Cobb | 3 | Son | — | Missouri |
| 46 | Ella Mueller | 25 | Servant | Servant | Missouri |
| 47 | Chas. A. Roberts | 59 | Head | Athletic Director | Missouri |
| 48 | Pearl S. Roberts | 56 | Wife | — | Missouri |
| 49 | George H. Jr. Curtis | 46 | Head | Wholesale Salesman | Pennsylvania |
| 50 | Emily S. Curtis | 44 | Wife | — | Pennsylvania |
| 51 | George H. Iii Curtis | 20 | Son | — | Massachusetts |
| 52 | Caroline Sweeney | 73 | Mother-in-law | — | Pennsylvania |
| 53 | Franklin P. Lewis | 59 | Head | Administrator | Indiana |
| 54 | Cynthia M. Lewis | 58 | Wife | — | Iowa |
| 55 | Catherine Lewis | 25 | Daughter | Secretary | So. Dakota |
| 56 | Lyman Lewis | 24 | Son | — | Wisconsin |
| 57 | Mary Meyer | 78 | Mother-in-law | — | Iowa |
| 58 | Marc B. Sr. Gautier | 50 | Head | Wholesale Salesman | Missouri |
| 59 | Ida U. Gautier | 45 | Wife | — | Missouri |
| 60 | Emilie A. Gautier | 17 | Daughter | — | Missouri |
| 61 | Marc B. Jr. Gautier | 11 | Son | — | Missouri |
| 62 | Emilie R. Uhri | 84 | Mother-in-law | — | Missouri |
| 63 | Ida M. H. Close | 82 | Aunt | — | Missouri |
| 64 | Alice M. Clarke | 49 | Head | — | Indiana |
| 65 | Alice Clarke | 22 | Daughter | — | Missouri |
| 66 | William A. Clarke | 20 | Son | — | Missouri |
| 67 | Mary Clarke THIS PERSON | 18 | Daughter | — | Missouri |
| 68 | Charles A. Clarke | 15 | Son | — | Missouri |
| 69 | Walter Clarke | 13 | Son | — | Missouri |
| 70 | H. Wallace Doerner | 54 | Head | Owner And Operator | Missouri |
| 71 | Lucille Doerner | 43 | Wife | — | Missouri |
| 72 | Walter B. Donnell | 52 | Head | Assistant Secretary | Missouri |
| 73 | Mae M. Donnell | 48 | Wife | — | Missouri |
| 74 | Mary Jane Donnell | 20 | Daughter | — | Missouri |
| 75 | Philip S. Haley | 56 | Head | Owner And Operator | Texas |
| 76 | Persis W. Haley | 54 | Wife | — | Illinois |
| 77 | Elmer Donnell | 62 | Head | Executive | Iowa |
| 78 | Bess J. Donnell | 57 | Wife | — | Iowa |
| 79 | Betsy Donnell | 17 | Daughter | — | Missouri |
| 80 | Robert Donnell | 14 | Son | — | 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)