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Mary Larkin — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this Mary Larkin across the 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1921), then head of a 8-person household.
Age 19
b. ~1921
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Larkin |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Occupation | New worker |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | New Worker |
| Township / Ward | Boston City |
| Est. Birth Year | ~1921 |
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 |
|---|---|---|---|---|
| Mary Larkin | Daughter | — | 19 | ~1921 |
| Norma Larkin | Daughter | — | 15 | ~1925 |
| Francis Larkin | Daughter | — | 12 | ~1928 |
| Eleanor Larkin | Daughter | — | 16 | ~1924 |
| Louise Larkin | Daughter | — | 4 | ~1936 |
| Patrick Larkin | Head | — | 50 | ~1890 |
| Thomas Larkin | Son | — | 21 | ~1919 |
| Katherine Larkin | Spouse | — | 47 | ~1893 |
Census Appearances
1930
Suffolk, Massachusetts
Daughter, age 9
Suffolk, Massachusetts · implied b. ~1921 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Larkin |
| Given Name | Margaret A |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Daughter, age 19
Suffolk-County, Massachusetts · implied b. ~1921 — 8 household members
| Surname | Larkin |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Occupation | New worker |
| Highest Grade | Hs 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 Larkin across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Larkin
Daughter · 1940 · age 19 · b. ~1921 · Massachusetts
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Sibling
Thomas Larkin
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Norma Larkin
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eleanor Larkin
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Francis Larkin
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Louise Larkin
Sibling · 1940 · age 4
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-t0627-01682-00577)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Peter Monahan | 58 | Head | Stationary Fireman | Irish Free State |
| 42 | Margaret Monahan | 23 | Daughter | Typist | Massachusetts |
| 43 | Thomas Coy | 42 | Head | Reception Clerk | Massachusetts |
| 44 | Florence Coy | 43 | Wife | — | Massachusetts |
| 45 | Thomas Coy | 10 | Son | — | Massachusetts |
| 46 | Patrick Dinn | 54 | Head | Tailor | Irish Free State |
| 47 | Eleanor Dinn | 42 | Wife | — | Irish Free State |
| 48 | Patricia Dinn | 7 | Daughter | — | Massachusetts |
| 49 | Patrick Larkin | 50 | Head | Motorman | Irish Free State |
| 50 | Katherine Larkin | 47 | Wife | — | Irish Free State |
| 51 | Mary Larkin THIS PERSON | 19 | Daughter | New Worker | Massachusetts |
| 52 | Eleanor Larkin | 16 | Daughter | — | Massachusetts |
| 53 | Norma Larkin | 15 | Daughter | — | Massachusetts |
| 54 | Francis Larkin | 12 | Daughter | — | Massachusetts |
| 55 | Thomas Larkin | 21 | Son | Counter Man | Massachusetts |
| 56 | Louise Larkin | 4 | Daughter | — | Massachusetts |
| 57 | — | None | — | — | — |
| 58 | Albert Mccarthy | 56 | Head | Meat Cutter | Massachusetts |
| 59 | Mary Mccarthy | 56 | Wife | — | Massachusetts |
| 60 | Albert J. Mccarthy | 31 | Son | Salesman | Massachusetts |
| 61 | Gertrude Mccarthy | 26 | Daughter | Hairdresser | Massachusetts |
| 62 | William F. Mccarthy | 23 | Son | — | Massachusetts |
| 63 | Helen Mccarthy | 21 | Daughter | Manicurist | Massachusetts |
| 64 | Joseph Mccarthy | 10 | Son | — | Massachusetts |
| 65 | James Cudhea | 61 | Head | Caretaker | Canada English |
| 66 | Katherine Cudhea | 61 | Wife | — | Irish Free State |
| 67 | Esther Cudhea | 23 | Daughter | Bookkeeper | Massachusetts |
| 68 | Edith Coley | 27 | Daughter | Stenographer | Massachusetts |
| 69 | John Coley | 10 | Grandson | — | Massachusetts |
| 70 | Paul Coley | 8 | Grandson | — | Massachusetts |
| 71 | George Reagan | 46 | Head | Supervisor Of Content | Massachusetts |
| 72 | Cornelia Reagan | 46 | Wife | — | Massachusetts |
| 73 | George Reagan | 16 | Son | — | Massachusetts |
| 74 | Marie Reagan | 3 | Daughter | — | Massachusetts |
| 75 | Charles Fosteras | 30 | Head | Hairdresser | Greece |
| 76 | Hope Fosteras | 33 | Wife | Hairdresser | Massachusetts |
| 77 | Charles Fosteras | 13 | Son | — | Massachusetts |
| 78 | Joseph Clark | 47 | Head | Owner Of Laundry | Massachusetts |
| 79 | Anna Clark | 45 | Wife | Laundress | Massachusetts |
| 80 | Elizabeth Clark | 20 | Daughter | — | 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)