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.~1921), then head of a 9-person household.
Age 19
b. ~1921
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Cronin |
| Given Name | Mary A. |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Chelsea City |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Occupation | New Worker |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | New Worker |
| Township / Ward | Chelsea 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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Frank Cronin | Other | — | 23 | ~1917 |
| Ellie Cronin | Spouse | — | 49 | ~1891 |
| Teresa Cronin | Daughter | — | 17 | ~1923 |
| Anna Cronin | Daughter | — | 22 | ~1918 |
| Martha Cronin | Daughter | — | 21 | ~1919 |
| James Cronin | Son | — | 16 | ~1924 |
| Mary Cronin | Daughter | — | 19 | ~1921 |
| James Cronin | Head | — | 52 | ~1888 |
| Catherine Cronin | Daughter | — | 24 | ~1916 |
Census Appearances
1930
Suffolk, Massachusetts
Daughter, age 9
Suffolk, Massachusetts · implied b. ~1921 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cronin |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Canada English |
| 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 — 9 household members
| Surname | Cronin |
| Given Name | Mary A. |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Chelsea City |
| 1935 Residence (County) | Suffolk |
| Occupation | New Worker |
| Highest Grade | No 8 |
| 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 · 1940 · age 19 · b. ~1921 · Massachusetts
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Sibling
Martha Cronin
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Teresa Cronin
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anna Cronin
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Cronin
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Cronin
Sibling · 1940 · age 16
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
35 people indexed on this census page (nara:1940:m-t0627-01641-00564)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Helen E. Mcdonough | 34 | daughter | House Keeper | Massachusetts |
| 47 | Adelard Pigeon | 57 | roomer | Care For Mgt. Ads | Massachusetts |
| 48 | John Girard | 39 | Head | Truck Driver | Massachusetts |
| 49 | Edith Girard | 37 | wife | House Keeper | New Hampshire |
| 50 | John Girard | 4 | son | — | Massachusetts |
| 51 | James D. Cronin | 52 | Head | Chef | Massachusetts |
| 52 | Ellie L. Cronin | 49 | wife | House Keeper | Massachusetts |
| 53 | Anna M. Cronin | 22 | daughter | House Keeper | Massachusetts |
| 54 | Catherine M. Cronin | 24 | daughter | Advertising | Massachusetts |
| 55 | Frank J. Cronin | 23 | daughter Son | Chef | Massachusetts |
| 56 | Martha L. Cronin | 21 | daughter | Sewing | Massachusetts |
| 57 | Mary A. Cronin THIS PERSON | 19 | daughter | New Worker | Massachusetts |
| 58 | Teresa Cronin | 17 | daughter | New Worker | Massachusetts |
| 59 | James D. Cronin | 16 | son | New Worker | Massachusetts |
| 60 | Nellie M. Tyrrell | 67 | Head | Matron | Massachusetts |
| 61 | John P. Joyce | 42 | Head | Ship Fitter | Massachusetts |
| 62 | Mary E. Joyce | 42 | wife | House Keeper | Massachusetts |
| 63 | Thomas J. Joyce | 20 | son | General Work | Massachusetts |
| 64 | John P. Joyce | 19 | son | New Worker | Massachusetts |
| 65 | Phyllis M. Joyce | 17 | daughter | New Worker | Massachusetts |
| 66 | Richard Joyce | 14 | son | New Worker | Massachusetts |
| 67 | James Joyce | 12 | son | — | Massachusetts |
| 68 | William Joyce | 11 | son | — | Massachusetts |
| 69 | Alma Finnegan | 35 | Head | Seamstress | Massachusetts |
| 70 | Helen Finnegan | 18 | daughter | General Work | Massachusetts |
| 71 | Dorothy Finnegan | 17 | daughter | New Worker | Massachusetts |
| 72 | Joseph Finnegan | 14 | son | New Worker | Massachusetts |
| 73 | James Finnegan | 10 | son | — | Massachusetts |
| 74 | Raymond Grant | 35 | Head | Steam Shovel Operator | Maine |
| 75 | Frances Grant | 30 | wife | House Keeper | Maine |
| 76 | Barbara Grant | 11 | daughter | — | Maine |
| 77 | Helen Grant | 10 | daughter | — | Massachusetts |
| 78 | Robert Grant | 5 | son | — | Massachusetts |
| 79 | Patricia Grant | 4 | daughter | — | Massachusetts |
| 80 | Alexander De Wolf | 44 | Head | Carpenter | Canada French |
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)