MW
Mary Welsh — 1940 US Census Record
1940 United States Federal Census · Middlesex-County, Massachusetts
Age 21
b. ~1919
Female
Daughter
Born: Mass
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Welsh |
| Given Name | Mary E |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Mass |
| 1935 Residence (City) | Watertown |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Occupation | Cashier |
| Industry | Retail Dept Store |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 780 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | mass |
| Occupation | Cashier |
| Township / Ward | Watertown |
| Est. Birth Year | ~1919 |
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.
20 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| John Welsh | Son | — | 23 | ~1917 |
| Catherine Welsh | Daughter | — | 12 | ~1928 |
| Lillian Welsh | Spouse | — | 42 | ~1898 |
| Leo Shamin | Son | — | 8 | ~1932 |
| Alice Welsh | Daughter | — | 25 | ~1915 |
| Robert Shamin | Son | — | 3 | ~1937 |
| Allen Brown | Spouse | — | 34 | ~1906 |
| Leo Shamin | Spouse | — | 37 | ~1903 |
| Norma Shamin | Daughter | — | 12 | ~1928 |
| Elaine Thiesing | Daughter | — | 12 | ~1928 |
| Ethelyn Brown | Daughter | — | 10 | ~1930 |
| Carl Thiesing | Spouse | — | 37 | ~1903 |
| Emma Thiesing | Spouse | — | 38 | ~1902 |
| Janet Shamin | Daughter | — | 5 | ~1935 |
| Mary Welsh | Daughter | — | 21 | ~1919 |
| Amanda Shamin | Spouse | — | 35 | ~1905 |
| Morris Brown | Spouse | — | 35 | ~1905 |
| John Welsh | Spouse | — | 57 | ~1883 |
| Walter Connor | Other | — | 56 | ~1884 |
| Joequize Brown | Daughter | — | 5 | ~1935 |
Census Appearances
1940
Middlesex-County, Massachusetts
Daughter, age 21
Middlesex-County, Massachusetts · implied b. ~1919 — 20 household members
| Surname | Welsh |
| Given Name | Mary E |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Mass |
| 1935 Residence (City) | Watertown |
| 1935 Residence (County) | Middlesex |
| Occupation | Cashier |
| Industry | Retail Dept Store |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 780 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | mass |
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.
Mary Welsh appears in the 1940 US Census.
Show:
This person
Anchor record
Mary Welsh
Daughter · 1940 · age 21 · b. ~1919 · Massachusetts
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Sibling
Elaine Thiesing
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Shamin
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Norma Shamin
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Alice Welsh
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Welsh
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Welsh
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joequize Brown
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Janet Shamin
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Leo Shamin
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ethelyn Brown
Sibling · 1940 · age 10
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
36 people indexed on this census page (nara:1940:m-t0627-01621-00006)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | John P Welsh | 57 | Husband | Salesman | English |
| 42 | Lillian G Welsh | 42 | Wife | — | Mass |
| 43 | Alice Welsh | 25 | Daughter | Steno | Mass |
| 44 | John F Welsh | 23 | Son | Shipp Clerk | Mass |
| 45 | Mary E Welsh THIS PERSON | 21 | Daughter | Cashier | Mass |
| 46 | Catherine D Welsh | 12 | Daughter | — | Mass |
| 47 | Walter J Connor | 56 | Bro-in-law | Clerk | Mass |
| 48 | Morris S Brown | 35 | Husband | Elec Welder | Vermont |
| 49 | Allen Brown | 34 | Wife | — | New Hamp |
| 50 | Ethelyn Brown | 10 | Daughter | — | Vermont |
| 51 | Joequize Brown | 5 | Daughter | — | Vermont |
| 52 | Leo F Shamin | 37 | Husband | Cable Splicer | Mass |
| 53 | Amanda B Shamin | 35 | Wife | — | Mass |
| 54 | Norma Shamin | 12 | Daughter | — | Mass |
| 55 | Leo Shamin | 8 | Son | — | Mass |
| 56 | Janet Shamin | 5 | Daughter | — | Mass |
| 57 | Robert Shamin | 3 | Son | — | Mass |
| 62 | Carl Thiesing | 37 | Husband | Textile Worker | Conn |
| 63 | Emma Thiesing | 38 | Wife | — | Mass |
| 64 | Elaine Thiesing | 12 | Daughter | — | Mass |
| 65 | Margaret Mcdonnell | 51 | Head | — | Mass |
| 66 | Lawrence F Mcdonnell | 28 | Son | Railway Mail | Mass |
| 67 | Ruth G Mcdonnell | 26 | Daughter | Mimeo-Operat | Mass |
| 68 | James J Mcdonnell | 23 | Son | Tester | Mass |
| 69 | Margaret Mcdonnell | 19 | Daughter | Gen Office Worker | Mass |
| 70 | Mary Mcdonnell | 12 | Daughter | — | Mass |
| 71 | Irene Mcdonnell | 5 | Daughter | — | Mass |
| 72 | John T Quinn | 38 | Husband | Operator | Mass |
| 73 | Mary A Quinn | 37 | Wife | — | Mass |
| 74 | John Quinn | 7 | Son | — | Mass |
| 75 | Maureen Quinn | 3 | Daughter | — | Mass |
| 76 | Mother Quinn | 15 | Mother | — | Mass |
| 77 | Mestas Robichaud | 64 | Husband | Carpenter | Mass |
| 78 | Elizabeth Robichaud | 63 | Wife | — | Mass |
| 79 | Marie J Robichaud | 43 | Daughter | Policy Writer | Mass |
| 80 | Ruth E Robichaud | 33 | Daughter | Comm-Artist | Mass |
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)