MW
Mary Walsh — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Mary Walsh across the 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1904), then head of a 9-person household.
Age 36
b. ~1904
Female
Daughter
Born: Canada English
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Walsh |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 36 |
| Marital Status | Single |
| Birthplace | Canada English |
| 1935 Residence (City) | Somerville |
| Naturalization Status | Alien |
| Additional Details | |
| Occupation | Telegraph operator |
| Industry | Telegraph |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 950 |
| Highest Grade | H-4 |
| 1935 Residence | Massachusetts |
| Birth Country | Canada |
| Birthplace (normalized) | canada english |
| Occupation | Telegraph Operator |
| Township / Ward | Waltham |
| Est. Birth Year | ~1904 |
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 |
|---|---|---|---|---|
| Eleanor Walsh | Daughter | — | 34 | ~1906 |
| Claire Walsh | Daughter | — | 29 | ~1911 |
| Frances Walsh | Daughter | — | 16 | ~1924 |
| Mary Walsh | Daughter | — | 36 | ~1904 |
| Thomas Walsh | Head | — | 65 | ~1875 |
| Bernard Walsh | Son | — | 19 | ~1921 |
| Philip Walsh | Son | — | 21 | ~1919 |
| Henry Walsh | Son | — | 27 | ~1913 |
| Henrietta Walsh | Spouse | — | 60 | ~1880 |
Census Appearances
1930
Middlesex, Massachusetts
Daughter, age 25
Middlesex, Massachusetts · implied b. ~1905 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Walsh |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Canada English |
| Father's Birthplace | Canada English |
| Mother's Birthplace | Canada English |
| Occupation | Telegraph operator |
| Industry | Telegraph company |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Veteran | No |
| Birth Country | Canada |
| Birthplace (normalized) | canada english |
1940
Middlesex-County, Massachusetts
Daughter, age 36
Middlesex-County, Massachusetts · implied b. ~1904 — 9 household members
| Surname | Walsh |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 36 |
| Marital Status | Single |
| Birthplace | Canada English |
| 1935 Residence (City) | Somerville |
| Naturalization Status | Alien |
| Occupation | Telegraph operator |
| Industry | Telegraph |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 950 |
| Highest Grade | H-4 |
| 1935 Residence | Massachusetts |
| Birth Country | Canada |
| Birthplace (normalized) | canada english |
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 Walsh across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Walsh
Daughter · 1940 · age 36 · b. ~1904 · Massachusetts
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Sibling
Henry Walsh
Sibling · 1940 · age 27
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frances Walsh
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Claire Walsh
Sibling · 1940 · age 29
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Philip Walsh
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Bernard Walsh
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eleanor Walsh
Sibling · 1940 · age 34
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-t0627-01619-00344)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Joseph C Somerset | 49 | Head | Office Manager | Russia |
| 2 | Mary Somerset | 48 | Wife | — | Massachusetts |
| 3 | Philomena Somerset | 15 | Daughter | — | Massachusetts |
| 4 | Thomas Walsh | 65 | Head | Painter | Canada English |
| 5 | Henrietta Walsh | 60 | Wife | — | Canada English |
| 6 | Mary Walsh THIS PERSON | 36 | Daughter | Telegraph Operator | Canada English |
| 7 | Eleanor Walsh | 34 | Daughter | Telegraph Operator | Canada English |
| 8 | Claire Walsh | 29 | Daughter | Stenographer | Canada English |
| 9 | Henry Walsh | 27 | Son | Painter | Canada English |
| 10 | Philip Walsh | 21 | Son | Painter | Canada English |
| 11 | Bernard Walsh | 19 | Son | — | Canada English |
| 12 | Frances Walsh | 16 | Daughter | — | Canada English |
| 13 | John Calusdian | 41 | Head | Butcher | Armenia |
| 14 | Anna Calusdian | 32 | Wife | Dress Cutter | Armenia |
| 15 | Beatrice Calusdian | 14 | Daughter | — | Massachusetts |
| 16 | Elizabeth Calusdian | 13 | Daughter | — | Massachusetts |
| 17 | Charles Young | 42 | Head | Manager | Massachusetts |
| 18 | Elsie M Young | 40 | Wife | — | Canada English |
| 19 | William Riley | 42 | Head | Patrolman | Massachusetts |
| 20 | Margaret Riley | 42 | Wife | — | Massachusetts |
| 21 | Margaret Riley | 19 | Daughter | Photographic Typist | Massachusetts |
| 22 | Mary Riley | 17 | Daughter | — | Massachusetts |
| 23 | William Riley | 15 | Son | — | Massachusetts |
| 24 | John Riley | 10 | Son | — | Massachusetts |
| 25 | Vertume Plouffe | 69 | Head | Carpenter | Canada French |
| 26 | Elizabeth Plouffe | 69 | Wife | — | Canada French |
| 27 | Beatrice Plouffe | 37 | Daughter | Assembler | Canada French |
| 28 | Armand Plouffe | 29 | Son | Foreman | Canada French |
| 29 | Bertha Plouffe | 33 | Daughter-in-law | — | Canada French |
| 30 | Francis Plouffe | 1 | Grandson | — | Massachusetts |
| 31 | Myron Thayer | 51 | Head | Proprietor | Massachusetts |
| 32 | Dorothy Thayer | 42 | Wife | Secretary | Massachusetts |
| 33 | Elinor Thayer | 21 | Daughter | Typist | Massachusetts |
| 34 | Myron Thayer | 10 | Son | — | Massachusetts |
| 35 | Grace Meader | 72 | Mother-in-law | — | New Hampshire |
| 36 | William F O'Connor | 38 | Head | Buyer | Massachusetts |
| 37 | Marjorie O'Connor | 29 | Wife | — | Massachusetts |
| 38 | Paul O'Connor | 12 | Son | — | Massachusetts |
| 39 | John O'Connor | 8 | Son | — | Massachusetts |
| 40 | John M Kelley | 44 | Head | Telephone Inspector | 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)