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Mary Tobin — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this Mary Tobin across the 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1929), then head of a 8-person household.
Age 11
b. ~1929
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Tobin |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Highest Grade | 5 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Boston |
| Est. Birth Year | ~1929 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| William Tobin | Head | — | 50 | ~1890 |
| Edmund Tobin | Son | — | 15 | ~1925 |
| John Tobin | Son | — | 12 | ~1928 |
| Mary Tobin | Daughter | — | 11 | ~1929 |
| Catherine Tobin | Spouse | — | 49 | ~1891 |
| David Tobin | Son | — | 17 | ~1923 |
| Alice Tobin | Daughter | — | 9 | ~1931 |
| Catherine Tobin | Daughter | — | 19 | ~1921 |
Census Appearances
1930
Suffolk, Massachusetts
Daughter, age 1
Suffolk, Massachusetts · implied b. ~1929 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Tobin |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Daughter, age 11
Suffolk-County, Massachusetts · implied b. ~1929 — 8 household members
| Surname | Tobin |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston |
| 1935 Residence (County) | Suffolk |
| Highest Grade | 5 |
| 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 Tobin across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Tobin
Daughter · 1940 · age 11 · b. ~1929 · Massachusetts
★ You are viewing this record
Sibling
John Tobin
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
David Tobin
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Tobin
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edmund Tobin
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Alice Tobin
Sibling · 1940 · age 9
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 — Suffolk-County, Massachusetts
Open full size
1940 US Federal Census — Suffolk-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01671-00517)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Thomas Byrnes | 2 | Son | — | Massachusetts |
| 42 | James H. Coughlin | 44 | Head | Foreman Plumber | Massachusetts |
| 43 | Helen Coughlin | 41 | Wife | — | Massachusetts |
| 44 | Helen C. Coughlin | 22 | Daughter | Ward Maid | Massachusetts |
| 45 | James H. Coughlin | 20 | Son | Soldier | Massachusetts |
| 46 | Francis J. Coughlin | 18 | Son | — | Massachusetts |
| 47 | Kathleen Coughlin | 15 | Daughter | — | Massachusetts |
| 48 | Regina Coughlin | 12 | Daughter | — | Massachusetts |
| 49 | Joan Coughlin | 7 | Daughter | — | Massachusetts |
| 50 | Leo Coughlin | 4 | Son | — | Massachusetts |
| 51 | Michael J. Lynch | 44 | Brother-in-law | Steel Worker | Massachusetts |
| 52 | William Tobin | 50 | Head | Janitor | Eire |
| 53 | Catherine Tobin | 49 | Wife | — | Eire |
| 54 | Catherine Tobin | 19 | Daughter | Stenographer | Massachusetts |
| 55 | David Tobin | 17 | Son | — | Massachusetts |
| 56 | Edmund Tobin | 15 | Son | — | Massachusetts |
| 57 | John Tobin | 12 | Son | — | Massachusetts |
| 58 | Mary Tobin THIS PERSON | 11 | Daughter | — | Massachusetts |
| 59 | Alice Tobin | 9 | Daughter | — | Massachusetts |
| 60 | Johana Keating | 78 | Head | — | Eire |
| 61 | Nora O'Neil | 70 | Sister | — | Eire |
| 62 | John Grant | 30 | Lodger | Shipper | Eire |
| 63 | Timothy J. Wyse | 48 | Head | Auto Mechanic | Eire |
| 64 | Catherine Wyse | 17 | Daughter | — | Massachusetts |
| 65 | Mary Wyse | 16 | Daughter | — | Massachusetts |
| 66 | James Wyse | 14 | Son | — | Massachusetts |
| 67 | Edmond T. Wyse | 13 | Son | — | Massachusetts |
| 68 | Josephine M. Wyse | 11 | Daughter | — | Massachusetts |
| 69 | Margaret M. Wyse | 9 | Daughter | — | Massachusetts |
| 70 | John S. Wyse | 59 | Brother-in-law | — | Eire |
| 71 | John O'Brien | 57 | Brother-in-law | Painter | Eire |
| 72 | Mary O'Brien | 60 | Sister | — | Eire |
| 73 | Edward O'Connor | 47 | Head | Moulder | Massachusetts |
| 74 | Mary O'Connor | 46 | Wife | — | Massachusetts |
| 75 | Margaret O'Connor | 25 | Daughter | Accountant | Massachusetts |
| 76 | Edward O'Connor | 22 | Son | Clerk | Massachusetts |
| 77 | Annabel O'Connor | 21 | Daughter | — | Massachusetts |
| 78 | John P. Treanor | 75 | Head | Physician | Canada |
| 79 | Margaret Treanor | 63 | Wife | — | New York |
| 80 | Anna Aligan | 19 | Servant | Servant | 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)