MH
Mary Hardin — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Worcester-County, Massachusetts
Our Model Tree links this Mary Hardin across the 1930 and 1940 US Censuses in Worcester-County, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1928), then head of a 9-person household.
Age 12
b. ~1928
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Worcester-County, Massachusetts |
| Surname | Hardin |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Worcester City |
| 1935 Residence (County) | Worcester |
| Additional Details | |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Worcester City |
| Est. Birth Year | ~1928 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Helen Hardin | Daughter | — | 16 | ~1924 |
| Harriet Hardin | Daughter | — | 14 | ~1926 |
| Mary Hardin | Daughter | — | 12 | ~1928 |
| Jane Hardin | Daughter | — | 9 | ~1931 |
| James Hardin | Son | — | 7 | ~1933 |
| Maud Hardin | Spouse | — | 35 | ~1905 |
| James Hardin | Head | — | 38 | ~1902 |
| Robert Hardin | Son | — | 5 | ~1935 |
| Paul Hardin | Son | — | 18 | ~1922 |
Census Appearances
1930
Worcester, Massachusetts
Other, age 2
Worcester, Massachusetts · implied b. ~1928 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Harding |
| Given Name | Muriel E. |
| Relationship to Head | Gr. Daughter |
| Sex | F |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Canada-English |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Worcester-County, Massachusetts
Daughter, age 12
Worcester-County, Massachusetts · implied b. ~1928 — 9 household members
| Surname | Hardin |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Worcester City |
| 1935 Residence (County) | Worcester |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| 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 Hardin across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Hardin
Daughter · 1940 · age 12 · b. ~1928 · Massachusetts
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Sibling
Harriet Hardin
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Hardin
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jane Hardin
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Hardin
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Hardin
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Paul Hardin
Sibling · 1940 · age 18
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 — 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-t0627-01714-00690)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Camille Chabot | 48 | wife | — | Ireland |
| 42 | Lila Hallock | 25 | daughter | — | Massachusetts |
| 43 | Warren Hallock | 25 | son | Automobile Mechanic | New York |
| 44 | Neil Hallock | 3 | son | — | Massachusetts |
| 45 | Infant Hallock | 0 | son | — | Massachusetts |
| 46 | Margaret J. Dupre | 77 | head | — | Massachusetts |
| 47 | Anthony Vapreio | 56 | lodger | Tailor | Lithuania |
| 48 | Cornelius O'Leary | 70 | lodger | — | Eire |
| 49 | James Hardin | 38 | head | Accessories Salesman | Massachusetts |
| 50 | Maud E. Hardin | 35 | wife | — | Massachusetts |
| 51 | Paul H. Hardin | 18 | son | Order Clerk | Massachusetts |
| 52 | Helen Hardin | 16 | daughter | — | Massachusetts |
| 53 | Harriet Hardin | 14 | daughter | — | Massachusetts |
| 54 | Mary Hardin THIS PERSON | 12 | daughter | — | Massachusetts |
| 55 | Jane Hardin | 9 | daughter | — | Massachusetts |
| 56 | James Jr. Hardin | 7 | son | — | Massachusetts |
| 57 | Robert Hardin | 5 | son | — | Massachusetts |
| 58 | Margaret M. Lerocque | 70 | head | — | New Hampshire |
| 59 | Herbert Wood | 65 | lodger | — | Massachusetts |
| 60 | John Costas | 42 | head | Rubber Mixer | Greece |
| 61 | Florence Costas | 42 | wife | — | Massachusetts |
| 62 | Irene Costas | 60 | mother | — | Greece |
| 63 | Francis Carey | 31 | brother-in-law | Manager | Massachusetts |
| 64 | Helen Costas | 19 | daughter | Cashier | Massachusetts |
| 65 | George Costas | 17 | son | Counterman | Massachusetts |
| 66 | John Costas | 19 | son | — | Massachusetts |
| 67 | James Costas | 15 | son | — | Massachusetts |
| 68 | George Eliopoulos | 50 | head | Manager | Greece |
| 69 | Marie E. Eliopoulos | 44 | wife | — | Greece |
| 70 | Aphrodite Eliopoulos | 14 | daughter | — | Massachusetts |
| 71 | Pagona Eliopoulos | 12 | daughter | — | Massachusetts |
| 72 | Ernestine Eliopoulos | 11 | daughter | — | Massachusetts |
| 73 | Napoleon B. Grenier | 66 | head | Laborer | Maine |
| 74 | Flora Grenier | 71 | wife | — | Massachusetts |
| 75 | Pearl Grenier | 17 | daughter | Housekeeper | Massachusetts |
| 76 | Peter F. Grenier | 16 | son | — | Massachusetts |
| 77 | Alfred Grenier | 14 | son | — | Massachusetts |
| 78 | Vegas L. Donatellimoni | 52 | head | Steel Polisher | Greece |
| 79 | May Donatellimoni | 39 | wife | — | New York |
| 80 | Augusta Donatellimoni | 18 | son | — | Massachusetts |
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)