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Mary Leahy — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Worcester-County, Massachusetts
Our Model Tree links this Mary Leahy across the 1930 and 1940 US Censuses in Worcester-County, Massachusetts (XGBoost, ~Confirmed) — first a spouse (b.~1893), then head of a 3-person household.
Age 47
b. ~1893
Female
Spouse
Born: New Jersey
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Worcester-County, Massachusetts |
| Surname | Leahy |
| Given Name | Mary E. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 47 |
| Marital Status | Married |
| Birthplace | New Jersey |
| 1935 Residence (City) | Worcester city |
| 1935 Residence (County) | Worcester |
| Additional Details | |
| Highest Grade | No 8 |
| 1935 Residence | Same house |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Township / Ward | Worcester City |
| Est. Birth Year | ~1893 |
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 Leahy | Spouse | — | 47 | ~1893 |
| John Leahy | Head | — | 49 | ~1891 |
| John Leahy | Son | — | 20 | ~1920 |
Census Appearances
1930
Worcester, Massachusetts
Spouse, age 37
Worcester, Massachusetts · implied b. ~1893 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Leahy |
| Given Name | Mary E. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 37 |
| Marital Status | Married |
| Birthplace | New Jersey |
| Age at First Marriage | 22 |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1940
Worcester-County, Massachusetts
Spouse, age 47
Worcester-County, Massachusetts · implied b. ~1893 — 3 household members
| Surname | Leahy |
| Given Name | Mary E. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 47 |
| Marital Status | Married |
| Birthplace | New Jersey |
| 1935 Residence (City) | Worcester city |
| 1935 Residence (County) | Worcester |
| Highest Grade | No 8 |
| 1935 Residence | Same house |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
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 47 · b. ~1893 · Massachusetts
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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 — Worcester-County, Massachusetts
Open full size
1940 US Federal Census — Worcester-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01717-00126)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Minnie Gapeau | 60 | Wife | — | Massachusetts |
| 42 | Gertrude O'Rourke | 36 | Daughter | — | Massachusetts |
| 43 | James O'Rourke | 16 | Grandson | — | Massachusetts |
| 44 | Phyllis O'Rourke | 10 | Granddaughter | — | Massachusetts |
| 45 | John E. Sr. Leahy | 49 | Head | Tractor Operator | Massachusetts |
| 46 | Mary E. Leahy THIS PERSON | 47 | Wife | — | New Jersey |
| 47 | John E. Jr. Leahy | 20 | Son | Clerk | Massachusetts |
| 48 | Caroline Peterson | 74 | Head | — | Sweden |
| 49 | Ellen Peterson | 40 | Daughter | — | Massachusetts |
| 50 | Bertha L. Woolner | 63 | Head | — | Massachusetts |
| 51 | Ruth L. Woolner | 34 | Daughter | Librarian | Massachusetts |
| 52 | Joseph S. Goven | 51 | Head | Salesman | Russia |
| 53 | Lillian Goven | 50 | Wife | — | Russia |
| 54 | Irving S. Goven | 15 | Son | — | Massachusetts |
| 55 | Irene G. Goven | 12 | Daughter | — | Massachusetts |
| 56 | Albert Cotzin | 56 | Head | Manager | Lithuania |
| 57 | Beela Cotzin | 47 | Wife | — | Lithuania |
| 58 | Rose Cotzin | 14 | Daughter | — | Massachusetts |
| 59 | Saul Cotzin | 10 | Son | — | Massachusetts |
| 60 | Nathan Moskovitz | 53 | Head | Storekeeper | Poland |
| 61 | Sadie Moskovitz | 50 | Wife | — | Russia |
| 62 | Harry Moskovitz | 27 | Son | Salesman | Massachusetts |
| 63 | Anne Moskovitz | 17 | Daughter | — | Massachusetts |
| 64 | Lillian Moskovitz | 8 | Daughter | — | Massachusetts |
| 65 | Joseph Olian | 37 | Head | Watch Repairer | Poland |
| 66 | Celia Olian | 34 | Wife | — | Russia |
| 67 | Rhoda E. Olian | 2 | Daughter | — | Massachusetts |
| 68 | Elizabeth Jorgelis | 47 | Maid | Maid | Lithuania |
| 69 | Philip Rosenblatt | 44 | Head | Salesman | Russia |
| 70 | Sarah Rosenblatt | 41 | Wife | — | Russia |
| 71 | Robert L. Rosenblatt | 14 | Son | — | Massachusetts |
| 72 | Melvin M. Rosenblatt | 9 | Son | — | Massachusetts |
| 73 | Harry Brooks | 45 | Head | Tailor | Russia |
| 74 | Ethel Brooks | 40 | Wife | — | Russia |
| 75 | Martha Brooks | 18 | Daughter | — | Massachusetts |
| 76 | Shirley Brooks | 14 | Daughter | — | Massachusetts |
| 77 | Kalla Brooks | 4 | Daughter | — | Massachusetts |
| 78 | Isadore Cohen | 43 | Head | Automobile | Lithuania |
| 79 | Sadie Cohen | 35 | Wife | — | Massachusetts |
| 80 | George Cohen | 15 | Son | — | Massachusetts |
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)