MH
Mary Hardy — 1940 US Census Record
Model Tree available1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Mary Hardy across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Charles & Mable — first a spouse (b.~1915), then head of a 7-person household.
Age 25
b. ~1915
Female
Spouse
Born: Massachusetts
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Hardy |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 25 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Watertown |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Highest Grade | H 2 |
| 1935 Residence | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Lexington Town |
| Est. Birth Year | ~1915 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| William Hardy | Head | — | 26 | ~1914 |
| Harriet Stone | Other | — | 5 | ~1935 |
| Ruth Stone | Other | — | 7 | ~1933 |
| Leonard Hardy | Other | — | 7 | ~1933 |
| Charlotte Oakley | Other | — | 17 | ~1923 |
| William Hardy | Son | — | 1 | ~1939 |
| Mary Hardy | Spouse | — | 25 | ~1915 |
Census Appearances
1920
Middlesex, Massachusetts
Daughter, age 5
Middlesex, Massachusetts · implied b. ~1915 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hardy |
| Given Name | Mable |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Speaks English | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Daughter, age 15
Middlesex, Massachusetts · implied b. ~1915 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hardy |
| Given Name | Mabel E |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Spouse, age 25
Middlesex-County, Massachusetts · implied b. ~1915 — 7 household members
| Surname | Hardy |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 25 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Watertown |
| 1935 Residence (County) | Middlesex |
| Highest Grade | H 2 |
| 1935 Residence | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
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 Hardy across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Charles Hardy (~0.92 confidence) and mother Mable Hardy (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Charles Hardy
b. ~1879
Source father
● Household
· direct · ~0.92
Mother
Mable Hardy
b. ~1879
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Hardy
Spouse · 1940 · age 25 · b. ~1915 · Massachusetts
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Middlesex-County, Massachusetts
Open full size
1940 US Federal Census — Middlesex-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01607-00673)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Antonio Lima | 63 | Head | Operator | Portugal |
| 2 | Mary Lima | 56 | Wife | — | Portugal |
| 3 | Leah Cronin | 31 | Daughter | — | Massachusetts |
| 4 | Edward Cronin | 29 | Son-in-law | Truck Driver | Massachusetts |
| 5 | William W. B. Sutton | 29 | Head | Salesman | Canada-English |
| 6 | Helene J. Sutton | 25 | Wife | Teacher | Massachusetts |
| 7 | Walter C. Thompson | 66 | Head | Dentist | Massachusetts |
| 8 | Mabel Thompson | 66 | Wife | — | Massachusetts |
| 9 | Carroll Sweeney | 40 | Head | Salesman | New York |
| 10 | Gladys Sweeney | 39 | Wife | — | New York |
| 11 | Loretta Sweeney | 14 | Daughter | — | New York |
| 12 | Carroll Sweeney | 10 | Son | — | New York |
| 13 | Anne Sweeney | 7 | Daughter | — | New York |
| 14 | Arthur Fletcher | 31 | Head | Automobile Mechanic | New Hampshire |
| 15 | Ethel Fletcher | 27 | Wife | — | Canada-English |
| 16 | Joan Fletcher | 4 | Daughter | — | Massachusetts |
| 17 | Kenneth Fletcher | 1 | Son | — | Massachusetts |
| 18 | Theron Gough | 34 | Head | Salesman | Vermont |
| 19 | Julia Gough | 35 | Wife | — | Massachusetts |
| 20 | George F. Leonard | 59 | Head | Watch-Maker | Massachusetts |
| 21 | Emma Leonard | 53 | Wife | — | Massachusetts |
| 22 | Charles G. Leonard | 65 | Brother | — | Massachusetts |
| 23 | William Hardy | 26 | Head | Truck Driver | Massachusetts |
| 24 | Mary Hardy THIS PERSON | 25 | Wife | — | Massachusetts |
| 25 | William Jr. Hardy | 1 | Son | — | Massachusetts |
| 26 | Ruth Stone | 7 | Step-daughter | — | Massachusetts |
| 27 | Harriet Stone | 5 | Step-daughter | — | Massachusetts |
| 28 | Charlotte Oakley | 17 | Sister-in-law | Waitress | Massachusetts |
| 29 | Leonard Hardy | 7 | Nephew | — | Massachusetts |
| 30 | Joseph Vecchione | 44 | Head | — | Italy |
| 31 | Beatrice Vecchione | 38 | Wife | — | Italy |
| 32 | Edith Vecchione | 14 | Daughter | — | Massachusetts |
| 33 | Anthony Vecchione | 13 | Son | — | Massachusetts |
| 34 | Louise Vecchione | 12 | Daughter | — | Massachusetts |
| 35 | Joseph Vecchione | 10 | Son | — | Massachusetts |
| 36 | Anna Vecchione | 5 | Daughter | — | Massachusetts |
| 37 | Rose Vecchione | 4 | Daughter | — | Massachusetts |
| 38 | Michael Vecchione | 1 | Son | — | Massachusetts |
| 39 | Manuel Rose | 57 | Head | Operator | Azores |
| 40 | Mary Rose | 55 | Wife | — | Azores |
Pedigree Summary
Mary
Gen 1 · 2 parents
~0.92
Max depth 4 (1900–1950 window)
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)