MF
Mary Flaherty — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Mary Flaherty across the 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1927), then head of a 10-person household.
Age 13
b. ~1927
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Flaherty |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Somerville City |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Somerville City |
| Est. Birth Year | ~1927 |
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 |
|---|---|---|---|---|
| Catherine Flaherty | Daughter | — | 6 | ~1934 |
| Bernard Flaherty | Son | — | 16 | ~1924 |
| Bernard Flaherty | Head | — | 43 | ~1897 |
| Thomas Flaherty | Son | — | 18 | ~1922 |
| William Flaherty | Son | — | 9 | ~1931 |
| Mary Flaherty | Daughter | — | 13 | ~1927 |
| Margaret Flaherty | Daughter | — | 8 | ~1932 |
| John Flaherty | Son | — | 11 | ~1929 |
| Minnie Flaherty | Spouse | — | 44 | ~1896 |
| Anna Flaherty | Daughter | — | 14 | ~1926 |
Census Appearances
1930
Middlesex, Massachusetts
Daughter, age 3
Middlesex, Massachusetts · implied b. ~1927 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Flaherty |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Irish Free State |
| Can Read/Write | No |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Daughter, age 13
Middlesex-County, Massachusetts · implied b. ~1927 — 10 household members
| Surname | Flaherty |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Somerville City |
| 1935 Residence (County) | Middlesex |
| Highest Grade | No 8 |
| 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 Flaherty across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Flaherty
Daughter · 1940 · age 13 · b. ~1927 · Massachusetts
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Sibling
William Flaherty
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Flaherty
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Flaherty
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Bernard Flaherty
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anna Flaherty
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Flaherty
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Flaherty
Sibling · 1940 · age 6
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-t0627-01702-00153)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Benjamin Cohn | 28 | Son | Clerk | Massachusetts |
| 42 | Myer Cohn | 24 | Son | Clerk | Massachusetts |
| 43 | Jeanette Cohn | 21 | Daughter | Sales | Massachusetts |
| 44 | Fred Lanzillo | 33 | Head | Chauffeur | Massachusetts |
| 45 | Mary Lanzillo | 31 | Wife | — | Massachusetts |
| 46 | Ralph Lanzillo | 7 | Son | — | Massachusetts |
| 47 | Angelina Lanzillo | 5 | Daughter | — | Massachusetts |
| 48 | John F. Mccann | 54 | Head | — | England |
| 49 | Agnes D. Mccann | 44 | Wife | Packer | Maine |
| 50 | John F. Jr. Mccann | 15 | Son | — | Massachusetts |
| 51 | Frank O'Brien | 47 | Head | Fitter | Massachusetts |
| 52 | Margaret O'Brien | 46 | Wife | — | Canada |
| 53 | William O'Brien | 24 | Son | — | Massachusetts |
| 54 | Margaret O'Brien | 20 | Daughter | Packer | Massachusetts |
| 55 | Edith O'Brien | 19 | Daughter | Housework | Massachusetts |
| 56 | Daniel O'Brien | 17 | Son | — | Massachusetts |
| 57 | Virginia O'Brien | 16 | Daughter | — | Massachusetts |
| 58 | Harold O'Brien | 15 | Son | — | Massachusetts |
| 59 | Eugene O'Brien | 10 | Son | — | Massachusetts |
| 60 | Patricia O'Brien | 8 | Daughter | — | Massachusetts |
| 61 | Marie O'Brien | 6 | Daughter | — | Massachusetts |
| 62 | Robert A. Sargent | 55 | Head | Roofer | Massachusetts |
| 63 | Bertha Sargent | 46 | Wife | — | Massachusetts |
| 64 | Robert Jr. Sargent | 24 | Son | Laborer | Massachusetts |
| 65 | George E. Sargent | 16 | Son | — | Massachusetts |
| 66 | Bernard Flaherty | 43 | Head | Operator | Massachusetts |
| 67 | Minnie Flaherty | 44 | Wife | — | Massachusetts |
| 68 | Thomas Flaherty | 18 | Son | — | Massachusetts |
| 69 | Bernard Jr. Flaherty | 16 | Son | — | Massachusetts |
| 70 | Anna Flaherty | 14 | Daughter | — | Massachusetts |
| 71 | Mary Flaherty THIS PERSON | 13 | Daughter | — | Massachusetts |
| 72 | John Flaherty | 11 | Son | — | Massachusetts |
| 73 | William Flaherty | 9 | Son | — | Massachusetts |
| 74 | Margaret Flaherty | 8 | Daughter | — | Massachusetts |
| 75 | Catherine Flaherty | 6 | Daughter | — | Massachusetts |
| 76 | John A. Latture | 36 | Head | Reader | Albania |
| 77 | Arline Latture | 29 | Wife | — | Massachusetts |
| 78 | John Jr. Latture | 8 | Son | — | Massachusetts |
| 79 | Shirley Latture | 5 | Daughter | — | Massachusetts |
| 80 | Abbott Shaw | 54 | Head | Painter | England |
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)