MF
Mary Finn — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Mary Finn across the 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1920), then head of a 10-person household.
Age 20
b. ~1920
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Finn |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Malden city |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Occupation | Stock Girl |
| Industry | Department Store |
| Class of Worker | PW |
| Hours Worked | 24 |
| Income (1939) | 60 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same Home |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Stock Girl |
| Township / Ward | Malden City |
| Est. Birth Year | ~1920 |
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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| James Finn | Son | — | 17 | ~1923 |
| Margaret Finn | Daughter | — | 8 | ~1932 |
| John Finn | Son | — | 13 | ~1927 |
| Mary Finn | Daughter | — | 20 | ~1920 |
| George Finn | Head | — | 50 | ~1890 |
| David Finn | Son | — | 13 | ~1927 |
| Ray Finn | Son | — | 24 | ~1916 |
| Anna Finn | Daughter | — | 22 | ~1918 |
| John Sheehan | Other | — | 40 | ~1900 |
| Anna Finn | Spouse | — | 47 | ~1893 |
Census Appearances
1930
Middlesex, Massachusetts
Daughter, age 10
Middlesex, Massachusetts · implied b. ~1920 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Finn |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| 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
Daughter, age 20
Middlesex-County, Massachusetts · implied b. ~1920 — 10 household members
| Surname | Finn |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Malden city |
| 1935 Residence (County) | Middlesex |
| Occupation | Stock Girl |
| Industry | Department Store |
| Class of Worker | PW |
| Hours Worked | 24 |
| Income (1939) | 60 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same Home |
| 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 Finn across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Finn
Daughter · 1940 · age 20 · b. ~1920 · Massachusetts
★ You are viewing this record
Sibling
Margaret Finn
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ray Finn
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anna Finn
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Finn
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
David Finn
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Finn
Sibling · 1940 · age 17
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 — 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-t0627-01608-00079)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Maria B Machado | 61 | Wife | — | Portugal |
| 2 | Frederick J Machado | 22 | Son | New Worker | Massachusetts |
| 3 | Patrick Leahy | 57 | Head | Watchman | Eire |
| 4 | Dennis Leahy | 55 | Brother | Stevedore | Massachusetts |
| 5 | Catherine Leahy | 52 | Sister | Stitcher | Massachusetts |
| 6 | Herman C Trapp | 71 | Head | — | Germany |
| 7 | Margaret T Trapp | 64 | Wife | Seamstress | Massachusetts |
| 8 | Kathryn A Gallagher | 41 | Daughter | — | Massachusetts |
| 9 | Ralph L Connolly | 25 | Head | Guard | Massachusetts |
| 10 | Mary E Connolly | 25 | Wife | — | Massachusetts |
| 11 | John E Connolly | 6 | Son | — | Massachusetts |
| 12 | Barbara A Connolly | 5 | Daughter | — | Massachusetts |
| 13 | Jane T Connolly | 3 | Daughter | — | Massachusetts |
| 14 | Edward R Sully | 58 | Head | Labourer | New York |
| 15 | William F Sully | 27 | Son | — | Massachusetts |
| 16 | Evelyn H Winslow | 34 | Daughter | — | Massachusetts |
| 17 | George H Finn | 50 | Head | Clerk | Massachusetts |
| 18 | Anna Finn | 47 | Wife | — | Massachusetts |
| 19 | Ray G Finn | 24 | Son | Laborer | Massachusetts |
| 20 | Anna Finn | 22 | Daughter | New Worker | Massachusetts |
| 21 | Mary Finn THIS PERSON | 20 | Daughter | Stock Girl | Massachusetts |
| 22 | James M Finn | 17 | Son | — | Massachusetts |
| 23 | David Finn | 13 | Son | — | Massachusetts |
| 24 | John J Finn | 13 | Son | — | Massachusetts |
| 25 | Margaret Finn | 8 | Daughter | — | Massachusetts |
| 26 | John J Sheehan | 40 | Lodger | Salesman | Massachusetts |
| 27 | Edward E Brock | 32 | Head | Driller | Massachusetts |
| 28 | Louise V Brock | 33 | Wife | — | New York |
| 29 | Carol R Brock | 2 | Daughter | — | Massachusetts |
| 30 | Charles E Brock | 1 | Son | — | Massachusetts |
| 31 | Franklin Coffin | 52 | Head | Engineer | Maine |
| 32 | Josephine Coffin | 46 | Wife | — | Illinois |
| 33 | Ralph D Coffin | 23 | Son | Fireman | Massachusetts |
| 34 | Edward Coffin | 15 | Son | — | Massachusetts |
| 35 | Theresa Coffin | 12 | Daughter | — | Massachusetts |
| 36 | Phyllis Coffin | 11 | Daughter | — | Massachusetts |
| 37 | Gladys Coffin | 20 | Daughter | Housework | Massachusetts |
| 38 | Charles Fucci | 42 | Head | Chauffeur | Massachusetts |
| 39 | Bertha Fucci | 37 | Wife | — | Canada Eng |
| 40 | Mildred Fucci | 17 | Daughter | — | 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)