MC
Mary Cronin — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this Mary Cronin across the 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1919), then head of a 10-person household.
Age 21
b. ~1919
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Cronin |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Occupation | Clerk |
| Industry | Telephone Co. |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 900 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same house |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Clerk |
| Township / Ward | Boston |
| 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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Cronin | Daughter | — | 21 | ~1919 |
| John Cronin | Son | — | 19 | ~1921 |
| Claire Cronin | Daughter | — | 7 | ~1933 |
| Elizabeth Cronin | Spouse | — | 45 | ~1895 |
| Neil Cronin | Son | — | 13 | ~1927 |
| Joseph Cronin | Son | — | 12 | ~1928 |
| Irene Cronin | Daughter | — | 15 | ~1925 |
| John Cronin | Head | — | 49 | ~1891 |
| Elizabeth Cronin | Daughter | — | 24 | ~1916 |
| Helen Cronin | Daughter | — | 17 | ~1923 |
Census Appearances
1930
Suffolk, Massachusetts
Daughter, age 11
Suffolk, Massachusetts · implied b. ~1919 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cronin |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Daughter, age 21
Suffolk-County, Massachusetts · implied b. ~1919 — 10 household members
| Surname | Cronin |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston |
| 1935 Residence (County) | Suffolk |
| Occupation | Clerk |
| Industry | Telephone Co. |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 900 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same house |
| 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 Cronin across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Cronin
Daughter · 1940 · age 21 · b. ~1919 · Massachusetts
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Sibling
Joseph Cronin
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Neil Cronin
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Claire Cronin
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elizabeth Cronin
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Irene Cronin
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Cronin
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Cronin
Sibling · 1940 · age 19
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-t0627-01671-00425)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Edward J. Davis | 10 | Son | — | Massachusetts |
| 42 | Betsy Munro | 76 | Head | — | Scotland |
| 43 | James Sidlauskas | 50 | Head | — | Lithuania |
| 44 | Sophie Sidlauskas | 45 | Wife | Cook | Lithuania |
| 45 | Stacia Sidlauskas | 23 | Daughter | Secretary | Massachusetts |
| 46 | Frances Sidlauskas | 18 | Daughter | — | Massachusetts |
| 47 | Bertha Sidlauskas | 15 | Daughter | — | Massachusetts |
| 48 | Jane Sidlauskas | 14 | Daughter | — | Massachusetts |
| 49 | John Sidlauskas | 12 | Son | — | Massachusetts |
| 50 | Harold Barr | 28 | Head | Shipper | Massachusetts |
| 51 | Florence Barr | 26 | Wife | — | Massachusetts |
| 52 | Elaine C. Barr | 1 | Daughter | — | Massachusetts |
| 53 | Ragnar Widing | 55 | Head | Painter | Sweden |
| 54 | Jennie Widing | 52 | Wife | — | Sweden |
| 55 | Robert Widing | 24 | Son | Painter | Massachusetts |
| 56 | Helen Widing | 20 | Daughter | Secretary | Massachusetts |
| 57 | Francis Gallagher | 62 | Head | Printer | Massachusetts |
| 58 | Isabel Gallagher | 62 | Wife | — | Massachusetts |
| 59 | Francis L. Gallagher | 31 | Son | Writer | Massachusetts |
| 60 | Edith Gallagher | 24 | Daughter | New Worker | Massachusetts |
| 61 | John Cronin | 49 | Head | Manager-Owner | Massachusetts |
| 62 | Elizabeth Cronin | 45 | Wife | — | Massachusetts |
| 63 | Elizabeth Cronin | 24 | Daughter | Stenographer | Massachusetts |
| 64 | Mary Cronin THIS PERSON | 21 | Daughter | Clerk | Massachusetts |
| 65 | John, Jr. Cronin | 19 | Son | — | Massachusetts |
| 66 | Helen Cronin | 17 | Daughter | — | Massachusetts |
| 67 | Irene Cronin | 15 | Daughter | — | Massachusetts |
| 68 | Neil Cronin | 13 | Son | — | Massachusetts |
| 69 | Joseph Cronin | 12 | Son | — | Massachusetts |
| 70 | Claire Cronin | 7 | Daughter | — | Massachusetts |
| 71 | Charles D. Anderson | 49 | Head | Policeman | Massachusetts |
| 72 | Mary Anderson | 47 | Wife | — | Massachusetts |
| 73 | Charles F. Anderson | 23 | Son | Chauffeur | Massachusetts |
| 74 | Mary D. Anderson | 21 | Daughter | — | Massachusetts |
| 75 | Ann C. Anderson | 9 | Daughter | — | Massachusetts |
| 76 | William T. Wren | 83 | Uncle-in-law | — | Massachusetts |
| 77 | Vincent Birmingham | 28 | Head | Salesman | Massachusetts |
| 78 | Mary Birmingham | 48 | Wife | — | Massachusetts |
| 79 | James Birmingham | 8 | Son | — | Massachusetts |
| 80 | William Hickey | 46 | Head | Laundryman | 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)