MC
Mary Corcoran — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this Mary Corcoran across the 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1922), then head of a 6-person household.
Age 18
b. ~1922
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Corcoran |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Highest Grade | H-4 |
| 1935 Residence | Same Place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Boston City |
| Est. Birth Year | ~1922 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Martin Corcoran | Head | — | 52 | ~1888 |
| Mary Corcoran | Daughter | — | 18 | ~1922 |
| Ann Corcoran | Daughter | — | 17 | ~1923 |
| Stephen Corcoran | Son | — | 14 | ~1926 |
| Margaret Corcoran | Spouse | — | 45 | ~1895 |
| Florence Corcoran | Daughter | — | 9 | ~1931 |
Census Appearances
1930
Suffolk, Massachusetts
Daughter, age 8
Suffolk, Massachusetts · implied b. ~1922 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Corcoran |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Ireland Free State |
| Mother's Birthplace | Ireland Free State |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Daughter, age 18
Suffolk-County, Massachusetts · implied b. ~1922 — 6 household members
| Surname | Corcoran |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Highest Grade | H-4 |
| 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 Corcoran across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Corcoran
Daughter · 1940 · age 18 · b. ~1922 · Massachusetts
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Sibling
Ann Corcoran
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Stephen Corcoran
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Florence Corcoran
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-t0627-01674-00705)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Marie Smolinsky | 35 | Wife | No | Massachusetts |
| 2 | Thomas Smolinsky | 15 | Son | — | Massachusetts |
| 3 | Marie Smolinsky | 12 | Daughter | — | Massachusetts |
| 4 | John Smolinsky | 9 | Son | — | Massachusetts |
| 5 | Robert Smolinsky | 7 | Son | — | Massachusetts |
| 6 | Thomas Tissell | 33 | Brother-in-law | Custodian | Massachusetts |
| 7 | Martin Corcoran | 52 | Head | Laborer | Irish Free State |
| 8 | Margaret Corcoran | 45 | Wife | — | Irish Free State |
| 9 | Mary Corcoran THIS PERSON | 18 | Daughter | — | Massachusetts |
| 10 | Ann Corcoran | 17 | Daughter | — | Massachusetts |
| 11 | Stephen Corcoran | 14 | Son | — | Massachusetts |
| 12 | Florence Corcoran | 9 | Daughter | — | Massachusetts |
| 13 | Michael Clancey | 37 | Head | Porter | Ireland |
| 14 | Elizabeth Clancey | 33 | Wife | — | Irish Free State |
| 15 | Michael Clancey | 7 | Son | — | Massachusetts |
| 16 | Patricia Clancey | 4 | Daughter | — | Massachusetts |
| 17 | James Clancey | 2 | Son | — | Massachusetts |
| 18 | Charles Murphy | 30 | Head | Paper Hanger | N. Ireland |
| 19 | Mary Murphy | 29 | Wife | — | N. Ireland |
| 20 | Mary Murphy | 3 | Daughter | — | Massachusetts |
| 21 | Stafford White | 56 | Head | Engineer | Massachusetts |
| 22 | Loretta White | 47 | Wife | — | Massachusetts |
| 23 | Arthur White | 12 | Son | — | Massachusetts |
| 24 | Loretta White | 10 | Daughter | — | Massachusetts |
| 25 | Catherine Roberts | 58 | Head | — | England |
| 26 | Edward Roberts | 30 | Son | Laborer | Massachusetts |
| 27 | Thomas Roberts | 25 | Son | — | Massachusetts |
| 28 | Augustus Wilkerson | 62 | Head | — | Massachusetts |
| 29 | Helen Wilkerson | 38 | Daughter | Filing Clerk | Massachusetts |
| 30 | William Conklin | 52 | Head | Salesman | Massachusetts |
| 31 | Annette Conklin | 50 | Wife | — | Massachusetts |
| 32 | Gladys Conklin | 15 | Daughter | — | Massachusetts |
| 33 | Catherine Dempsey | 72 | Head | — | Ireland |
| 34 | Thomas A. Dempsey | 38 | Son | Manager | Massachusetts |
| 35 | Catherine B. Dempsey | 30 | Daughter | Stenographer | Massachusetts |
| 36 | Anna Mcdonnell | 65 | Head | — | Massachusetts |
| 37 | Marie Mcdonnell | 34 | Daughter | Clerk | Massachusetts |
| 38 | Margaret Mcdonnell | 24 | Daughter | Sales Clerk | Massachusetts |
| 39 | Paul Cronin | 44 | Head | Truck Driver | Massachusetts |
| 40 | Helen Cronin | 34 | Wife | — | 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)