MC
Mary Cronin — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Middlesex, Massachusetts
Our Model Tree links this Mary Cronin across the 1930 and 1940 US Censuses in Middlesex, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1912), then head of a 9-person household.
Age 18
b. ~1912
Female
Daughter
Born: Massachusetts
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Middlesex, Massachusetts |
| Surname | Cronin |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Additional Details | |
| Occupation | Clerk |
| Industry | City |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Clerk |
| Township / Ward | Cambridge City |
| Est. Birth Year | ~1912 |
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.
9 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Margaret Cronin | Daughter | — | 16 | ~1914 |
| Mary Cronin | Daughter | — | 18 | ~1912 |
| James Cronin | Son | — | 7 | ~1923 |
| John Cronin | Son | — | 15 | ~1915 |
| William Cronin | Son | — | 11 | ~1919 |
| Helen Cronin | Daughter | — | 13 | ~1917 |
| Catherine Cronin | Daughter | — | 9 | ~1921 |
| John Cronin | Head | — | 43 | ~1887 |
| Mary Cronin | Spouse | — | 42 | ~1888 |
Census Appearances
1930
Middlesex, Massachusetts
Daughter, age 18
Middlesex, Massachusetts · implied b. ~1912 — 9 household members
| Surname | Cronin |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Occupation | Clerk |
| Industry | City |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Daughter, age 29
Middlesex-County, Massachusetts · implied b. ~1911 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cremonini |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 29 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Bedford |
| 1935 Residence (County) | Middlesex |
| Occupation | General clerical |
| Industry | Dairy |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 78 |
| 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 Cronin across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Cronin
Daughter · 1930 · age 18 · b. ~1912 · Massachusetts
★ You are viewing this record
Sibling
John Cronin
Sibling · 1930 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Cronin
Sibling · 1930 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Cronin
Sibling · 1930 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Cronin
Sibling · 1930 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Cronin
Sibling · 1930 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Cronin
Sibling · 1930 · 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
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:massachusettscensus00reel916:0381)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Timothy Flynn | 28 | Son | Salesman | Massachusetts |
| 52 | Edward Flynn | 26 | Son | — | Massachusetts |
| 53 | Mary Flynn | 24 | Daughter | — | Massachusetts |
| 54 | Helen Flynn | 22 | Daughter | — | Massachusetts |
| 55 | William J Sullivan | 45 | Head | Manager | Massachusetts |
| 56 | Mary Sullivan | 45 | Wife | — | Massachusetts |
| 57 | William Sullivan | 18 | Son | — | Massachusetts |
| 58 | Arthur Sullivan | 15 | Son | — | Massachusetts |
| 59 | Mary Sullivan | 13 | Daughter | — | Massachusetts |
| 60 | Helen Sullivan | 11 | Daughter | — | Massachusetts |
| 61 | John Sullivan | 8 | Son | — | Massachusetts |
| 62 | James Sullivan | 6 | Son | — | Massachusetts |
| 63 | Timothy Cronin | 44 | Head | Foreman | Irish Free State |
| 64 | Mary Cronin | 44 | Wife | — | Irish Free State |
| 65 | Mary Cronin | 18 | Daughter | — | Massachusetts |
| 66 | Timothy Cronin | 16 | Son | — | Massachusetts |
| 67 | John Cronin | 14 | Son | — | Massachusetts |
| 68 | Elizabeth Cronin | 12 | Daughter | — | Massachusetts |
| 69 | Catherine Cronin | 10 | Daughter | — | Massachusetts |
| 70 | James Cronin | 7 | Son | — | Massachusetts |
| 71 | John Laughlin | 52 | Head | Iron Worker | Irish Free State |
| 72 | Maria Laughlin | 50 | Wife | — | Irish Free State |
| 73 | John Laughlin | 17 | Son | — | Massachusetts |
| 74 | Helen E Laughlin | 14 | Daughter | — | Massachusetts |
| 75 | Alice M Laughlin | 13 | Daughter | — | Massachusetts |
| 76 | James J Laughlin | 10 | Son | — | Massachusetts |
| 77 | Arthur M Laughlin | 8 | Son | — | Massachusetts |
| 78 | Walter Laughlin | 6 | Son | — | Massachusetts |
| 79 | Lester Mcmullan | 27 | Head | Chauffeur | Connecticut |
| 80 | Mary Mcmullan | 26 | Wife | — | Massachusetts |
| 81 | Lester Mcmullan | 7 | Son | — | Massachusetts |
| 82 | Mary Mcmullan | 6 | Daughter | — | Massachusetts |
| 83 | John Mcmullan | 4 | Son | — | Massachusetts |
| 84 | James Mcmullan | 2 | Son | — | Massachusetts |
| 85 | Robert Mcmullan | 1 | Son | — | Massachusetts |
| 86 | Catherine Mcmullan | 0 | Daughter | — | Massachusetts |
| 87 | John Cronin | 43 | Head | Guard | Irish Free State |
| 88 | Mary Cronin | 42 | Wife | — | Irish Free State |
| 89 | Mary Cronin THIS PERSON | 18 | Daughter | Clerk | Massachusetts |
| 90 | Margaret Cronin | 16 | Daughter | — | Massachusetts |
| 91 | John Cronin | 15 | Son | — | Massachusetts |
| 92 | Helen Cronin | 13 | Daughter | — | Massachusetts |
| 93 | William Cronin | 11 | Son | — | Massachusetts |
| 94 | Catherine Cronin | 9 | Daughter | — | Massachusetts |
| 95 | James Cronin | 7 | Son | — | Massachusetts |
| 96 | William Laughlin | 42 | Head | Motorman | Irish Free State |
| 97 | Catherine Laughlin | 43 | Wife | — | Irish Free State |
| 98 | William Laughlin | 16 | Son | — | Massachusetts |
| 99 | Thomas Laughlin | 13 | Son | — | Massachusetts |
| 100 | Thomas Laughlin | 52 | Head | Watchman | Irish Free State |
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)