ML
Mary Leahy — 1930 US Census Record
Linked across censuses1930 United States Federal Census · St Louis, Missouri
Our Model Tree links this Mary Leahy across the 1920 and 1930 US Censuses in St Louis, Missouri (XGBoost, ~Confirmed) — first a spouse (b.~1876), then head of a 21-person household.
Age 54
b. ~1876
Female
Spouse
Born: Missouri
Married
1930 Census Record Details
| Census Year | 1930 |
| Location | St Louis, Missouri |
| Surname | Leahy |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 54 |
| Marital Status | Married |
| Birthplace | Missouri |
| Age at First Marriage | 21 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
| Township / Ward | St Louis City |
| Est. Birth Year | ~1876 |
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.
21 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Joseph Leahy | Son | — | ~1930 | |
| Margaret Leahy | Daughter | — | 12 | ~1918 |
| Joseph Leahy | Son | — | ~1930 | |
| Catherine Leahy | Daughter | — | 18 | ~1912 |
| Joseph Leahy | Son | — | ~1930 | |
| Joseph Leahy | Son | — | ~1930 | |
| Mary Leahy | Daughter | — | 2 | ~1928 |
| Joseph Leahy | Son | — | 4 | ~1926 |
| Louise Leahy | Daughter | — | 10 | ~1920 |
| Thomas Leahy | Son | — | 16 | ~1914 |
| Lloyd Leahy | Son | — | 20 | ~1910 |
| Mary Leahy | Daughter | — | ~1930 | |
| Edward Leahy | Son | — | 14 | ~1916 |
| William Leahy | Son | — | 8 | ~1922 |
| Mary Leahy | Daughter | — | 21 | ~1909 |
| Mary Leahy | Spouse | — | 54 | ~1876 |
| Mary Leahy | Daughter | — | ~1930 | |
| Thomas Leahy | Head | — | 60 | ~1870 |
| Mary Leahy | Daughter | — | ~1930 | |
| Mary Leahy | Daughter | — | 6 | ~1924 |
| Joseph Leahy | Son | — | 24 | ~1906 |
Census Appearances
1920
St Louis, …
Spouse, age 43
St Louis, Missouri · implied b. ~1877 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Leahy |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 43 |
| Marital Status | Married |
| Birthplace | Missouri |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Scotland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
1930
St Louis, …
Spouse, age 54
St Louis, Missouri · implied b. ~1876 — 21 household members
| Surname | Leahy |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 54 |
| Marital Status | Married |
| Birthplace | Missouri |
| Age at First Marriage | 21 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read/Write | Yes |
| 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 (1920 and 1930) in St Louis, Missouri, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Leahy
Spouse · 1930 · age 54 · b. ~1876 · Missouri
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1930 US Federal Census — St Louis, Missouri
Open full size
1930 US Federal Census — St Louis, Missouri
Page Contents
50 people indexed on this census page (ia:1930:missouricensus00reel1242:0655)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | — | 51 | Head | — | Missouri |
| 52 | — | 48 | Wife | — | Missouri |
| 53 | — | 23 | Son | Salesman | Missouri |
| 54 | — | 21 | Daughter | — | Missouri |
| 55 | Bruce Vandament | 41 | Head | Salesman | Missouri |
| 56 | Mary Vandament | 37 | Wife | — | Missouri |
| 57 | Mary Lee Vandament | 15 | Daughter | — | Missouri |
| 58 | Bruce Jr. Vandament | 13 | Son | — | Missouri |
| 59 | Richard Vandament | 11 | Son | — | Missouri |
| 60 | Robert Vandament | 9 | Son | — | Missouri |
| 61 | William Vandament | 7 | Son | — | Missouri |
| 62 | John Vandament | 5 | Son | — | Missouri |
| 63 | James Vandament | 3 | Son | — | Missouri |
| 64 | Martha Vandament | 1 | Daughter | — | Missouri |
| 65 | Betty Vandament | 0 | Daughter | — | Missouri |
| 66 | Charles Vandament | 0 | Son | — | Missouri |
| 67 | George Vandament | 0 | Son | — | Missouri |
| 68 | Thomas Vandament | 0 | Son | — | Missouri |
| 69 | Joseph Vandament | 0 | Son | — | Missouri |
| 70 | Edward Vandament | 0 | Son | — | Missouri |
| 71 | Margaret Vandament | 0 | Daughter | — | Missouri |
| 72 | Louise Vandament | 0 | Daughter | — | Missouri |
| 73 | William Vandament | 0 | Son | — | Missouri |
| 74 | Mary Vandament | 0 | Daughter | — | Missouri |
| 75 | Joseph Vandament | 0 | Son | — | Missouri |
| 76 | Mary Vandament | 0 | Daughter | — | Missouri |
| 77 | Joseph Vandament | 0 | Son | — | Missouri |
| 78 | Mary Vandament | 0 | Daughter | — | Missouri |
| 79 | Joseph Vandament | 0 | Son | — | Missouri |
| 80 | Thomas Leahy | 60 | Head | — | Missouri |
| 81 | Mary Leahy THIS PERSON | 54 | Wife | — | Missouri |
| 82 | Joseph Leahy | 24 | Son | — | Missouri |
| 83 | Mary Leahy | 21 | Daughter | Stenographer | Missouri |
| 84 | Lloyd Leahy | 20 | Son | Clerk | Missouri |
| 85 | Catherine Leahy | 18 | Daughter | Stenographer | Missouri |
| 86 | Thomas Leahy | 16 | Son | Clerk | Missouri |
| 87 | Edward Leahy | 14 | Son | — | Missouri |
| 88 | Margaret Leahy | 12 | Daughter | — | Missouri |
| 89 | Louise Leahy | 10 | Daughter | — | Missouri |
| 90 | William Leahy | 8 | Son | — | Missouri |
| 91 | Mary Leahy | 6 | Daughter | — | Missouri |
| 92 | Joseph Leahy | 4 | Son | — | Missouri |
| 93 | Mary Leahy | 2 | Daughter | — | Missouri |
| 94 | Joseph Leahy | 0 | Son | — | Missouri |
| 95 | Mary Leahy | 0 | Daughter | — | Missouri |
| 96 | Joseph Leahy | 0 | Son | — | Missouri |
| 97 | Mary Leahy | 0 | Daughter | — | Missouri |
| 98 | Joseph Leahy | 0 | Son | — | Missouri |
| 99 | Mary Leahy | 0 | Daughter | — | Missouri |
| 100 | Joseph Leahy | 0 | Son | — | Missouri |
Related Census Records
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)