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Mary Leahy — 1940 US Census Record
Linked across censuses1940 United States Federal Census · St.-Louis-City-County, Missouri
Our Model Tree links this Mary Leahy across the 1930 and 1940 US Censuses in St.-Louis-City-County, Missouri (XGBoost, ~Confirmed) — first a spouse (b.~1875), then head of a 3-person household.
Age 65
b. ~1875
Female
Spouse
Born: Missouri
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | St.-Louis-City-County, Missouri |
| Surname | Leahy |
| Given Name | Mary E. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 65 |
| Marital Status | Married |
| Birthplace | Missouri |
| 1935 Residence (City) | St. Louis (City) |
| 1935 Residence (County) | St. Louis City |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | H 4 |
| 1935 Residence | Same Place |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
| Township / Ward | St Louis City |
| Est. Birth Year | ~1875 |
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 |
|---|---|---|---|---|
| David Leahy | Head | — | 64 | ~1876 |
| Janet Leahy | Daughter | — | 27 | ~1913 |
| Mary Leahy | Spouse | — | 65 | ~1875 |
Census Appearances
1930
St Louis, …
Spouse, age 53
St Louis, Missouri · implied b. ~1877 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Leahy |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 53 |
| Marital Status | Married |
| Birthplace | Missouri |
| Age at First Marriage | 30 |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Can Read/Write | Yes |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
1940
St.-Louis-City-County, Missouri
Spouse, age 65
St.-Louis-City-County, Missouri · implied b. ~1875 — 3 household members
| Surname | Leahy |
| Given Name | Mary E. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 65 |
| Marital Status | Married |
| Birthplace | Missouri |
| 1935 Residence (City) | St. Louis (City) |
| 1935 Residence (County) | St. Louis City |
| Class of Worker | 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 Leahy across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Leahy
Spouse · 1940 · age 65 · b. ~1875 · Missouri
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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 — St.-Louis-City-County, Missouri
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1940 US Federal Census — St.-Louis-City-County, Missouri
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02207-00340)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Paul J. Wiesler | 57 | Partner | Illuminating Engineer | Austria |
| 2 | Nell Wiesler | 36 | Partner | Engineer | Missouri |
| 3 | Paul J. Jr. Wiesler | 12 | Son | — | Missouri |
| 4 | William J. Wiesler | 7 | Son | — | Missouri |
| 5 | Leona Rains | 47 | Head | Manager | Missouri |
| 6 | Patsy Rains | 15 | Daughter | — | Iowa |
| 7 | James Paul | 45 | Lodger | Accountant | Missouri |
| 8 | Verda Paul | 40 | Lodger | Saleswoman | Missouri |
| 9 | Frieda Kuston | 46 | Lodger | Auditor | Germany |
| 10 | Irene Marquest | 24 | Lodger | Saleswoman | Missouri |
| 11 | Tom Curley | 37 | Lodger | Clerk | Illinois |
| 12 | Jess Reynolds | 49 | Head | Salesman | Kentucky |
| 13 | Jess Reynolds | 15 | Daughter | — | Kentucky |
| 14 | Ben Reynolds | 14 | Son | — | Missouri |
| 15 | Bill Reynolds | 12 | Son | — | Missouri |
| 16 | Lorraine Eslie | 37 | Maid | Housemaid | New York |
| 17 | Joseph Schurick | 70 | Head | General Clerk | Missouri |
| 18 | Pauline Schurick | 65 | Wife | — | Missouri |
| 19 | Lydia Schlottach | 48 | Maid | Housemaid | Missouri |
| 20 | Norman Eisner | 63 | Head | Minister | Pennsylvania |
| 21 | Myrtle Eisner | 62 | Wife | — | Pennsylvania |
| 22 | Frank Rutherford | 60 | Head | — | Illinois |
| 23 | Lillian Rutherford | 58 | Wife | Manager | Illinois |
| 24 | Julia Basse | 60 | Lodger | — | Missouri |
| 25 | Wm. Berfoot | 62 | Lodger | Salesman | Illinois |
| 26 | Edward Carr | 26 | Lodger | Bus Driver | Texas |
| 27 | Carl Weaver | 31 | Lodger | Clerk | Missouri |
| 28 | Wilbert Schmidt | 47 | Lodger | Lecturer | Missouri |
| 29 | David P. Leahy | 64 | Head | Sub Division Real Estate Agent | Missouri |
| 30 | Mary E. Leahy THIS PERSON | 65 | Wife | — | Missouri |
| 31 | Janet A. Leahy | 27 | Daughter | Social Worker | Missouri |
| 32 | Frank Smith | 50 | Head | Service Car Chauffeur | Pennsylvania |
| 33 | Alice Smith | 37 | Wife | — | Pennsylvania |
| 34 | James F. Pierce | 22 | Head | Bookkeeper | Mississippi |
| 35 | Wife Pierce | 21 | Wife | Clerk (Office) | Iowa |
| 36 | Max Bergs | 55 | Lodger | Floor Walker | Ohio |
| 37 | Stella Bergs | 22 | Lodger | — | Missouri |
| 38 | Harry Everitte | 30 | Lodger | Salesman | Oklahoma |
| 39 | Nan Everitte | 25 | Lodger | — | Illinois |
| 40 | W. D. Walsh | 62 | Head | — | 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)