MC
Mary Corcoran — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Middlesex, Massachusetts
Our Model Tree links this Mary Corcoran across the 1930 and 1940 US Censuses in Middlesex, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1900), then head of a 7-person household.
Age 30
b. ~1900
Female
Daughter
Born: Massachusetts
Married
1930 Census Record Details
| Census Year | 1930 |
| Location | Middlesex, Massachusetts |
| Surname | Corcoran |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 30 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| Age at First Marriage | 20 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Additional Details | |
| Occupation | File-clerk |
| Industry | Library Bureau |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | File-Clerk |
| Township / Ward | Cambridge City |
| Est. Birth Year | ~1900 |
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.
7 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Morris Carroll | Other | — | 27 | ~1903 |
| Josephine Corcoran | Daughter | — | 28 | ~1902 |
| Mary Corcoran | Daughter | — | 30 | ~1900 |
| Timothy Corcoran | Son | — | 33 | ~1897 |
| Jeremiah Corcoran | Son | — | 19 | ~1911 |
| Mary Corcoran | Head | — | 54 | ~1876 |
| William Corcoran | Son | — | 26 | ~1904 |
Census Appearances
1930
Middlesex, Massachusetts
Daughter, age 30
Middlesex, Massachusetts · implied b. ~1900 — 7 household members
| Surname | Corcoran |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 30 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| Age at First Marriage | 20 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | File-clerk |
| Industry | Library Bureau |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Spouse, age 40
Middlesex-County, Massachusetts · implied b. ~1900 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Corcoran |
| Given Name | Margaret |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Belmont Town |
| 1935 Residence (County) | Middlesex |
| Highest Grade | C-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 · 1930 · age 30 · b. ~1900 · Massachusetts
★ You are viewing this record
Sibling
Josephine Corcoran
Sibling · 1930 · age 28
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Corcoran
Sibling · 1930 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jeremiah Corcoran
Sibling · 1930 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Timothy Corcoran
Sibling · 1930 · age 33
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
1930 US Federal Census — Middlesex, Massachusetts
Open full size
1930 US Federal Census — Middlesex, Massachusetts
Page Contents
50 people indexed on this census page (ia:1930:massachusettscensus00reel915:0248)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Anna Gomes | 10 | Daughter | — | Massachusetts |
| 52 | Charles Gomes | 9 | Son | — | Massachusetts |
| 53 | Catherine Gomes | 7 | Daughter | — | Massachusetts |
| 54 | Manuel Perry | 46 | Head | Fireman | Portugal |
| 55 | Emily Perry | 43 | Wife | — | Portugal |
| 56 | Manuel Jr Perry | 13 | Son | — | Massachusetts |
| 57 | Beatrice Perry | 10 | Daughter | — | Massachusetts |
| 58 | Manuel Jesus | 44 | Head | Shoe-Maker | Portugal |
| 59 | Mary Jesus | 30 | Wife | — | Portugal |
| 60 | Alice Jesus | 7 | Daughter | — | Massachusetts |
| 61 | John Jesus | 5 | Son | — | Massachusetts |
| 62 | Mary Jesus | 3 | Daughter | — | Massachusetts |
| 63 | Frank Fulginiti | 37 | Head | Truck Driver | Italy |
| 64 | Frances Fulginiti | 26 | Wife | — | Italy |
| 65 | Francis Fulginiti | 7 | Son | — | Massachusetts |
| 66 | Elizabeth Fulginiti | 6 | Daughter | — | Massachusetts |
| 67 | James Cahill | 45 | Head | Laborer | Ireland |
| 68 | Margaret Cahill | 44 | Wife | — | Ireland |
| 69 | Matthew Battell | 62 | Head | — | Ireland |
| 70 | Margaret Battell | 54 | Wife | — | Ireland |
| 71 | John Battell | 25 | Son | Electrician | Massachusetts |
| 72 | Alice Battell | 23 | Daughter | Sales-Girl | Massachusetts |
| 73 | Matthew Jr Battell | 21 | Son | Laborer | Massachusetts |
| 74 | Catherine Battell | 16 | Daughter | — | Massachusetts |
| 75 | James Battell | 13 | Son | — | Massachusetts |
| 76 | Mary Corcoran | 54 | Head | — | Ireland |
| 77 | Timothy J Corcoran | 33 | Son | Candy-Maker | Massachusetts |
| 78 | William Corcoran | 26 | Son | Truck Driver | Massachusetts |
| 79 | Jeremiah Corcoran | 19 | Son | Electrician | Massachusetts |
| 80 | Mary Corcoran THIS PERSON | 30 | Daughter | File-Clerk | Massachusetts |
| 81 | Josephine Corcoran | 28 | Daughter | Packer | Massachusetts |
| 82 | Morris Carroll | 27 | Boarder | Machine Worker | Ireland |
| 83 | John J Vieira | 37 | Head | Clergy-Man | Portugal |
| 84 | Margaret Vieira | 27 | Wife | — | Massachusetts |
| 85 | Gilbert Vieira | 5 | Son | — | Massachusetts |
| 86 | Simon Nessibian | 47 | Head | Garter-Maker | Armenia |
| 87 | Reine Nessibian | 42 | Wife | — | Armenia |
| 88 | Felix Nessibian | 15 | Son | Usher | Armenia |
| 89 | Marie Nessibian | 19 | Daughter | Clerk-Office | Massachusetts |
| 90 | Francis J Galgay | 68 | Head | — | Newfoundland |
| 91 | Mary F Galgay | 66 | Wife | — | Newfoundland |
| 92 | William H Jackson | 36 | Boarder | Sexton | Ireland |
| 93 | Joseph Godinho | 61 | Head | Barber | Portugal |
| 94 | Mary Godinho | 52 | Wife | — | Portugal |
| 95 | Evelyn Godinho | 16 | Daughter | — | Massachusetts |
| 96 | John T Burke | 36 | Head | Salesman | Massachusetts |
| 97 | Ruth Burke | 21 | Wife | — | Massachusetts |
| 98 | John A Burke | 1 | Son | — | Massachusetts |
| 99 | Edwin F Burke | 0 | Son | — | Massachusetts |
| 100 | Hovagim Matrosian | 39 | Head | Stitcher | Armenia |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)