JC
John Cronin — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Worcester-County, Massachusetts
Our Model Tree links this John Cronin across the 1930 and 1940 US Censuses in Worcester-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1929), then head of a 9-person household.
Age 11
b. ~1929
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Worcester-County, Massachusetts |
| Surname | Cronin |
| Given Name | John |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Worcester City |
| 1935 Residence (County) | Worcester |
| Additional Details | |
| Industry | S |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Worcester City |
| Est. Birth Year | ~1929 |
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 John | Age | Birth yr |
|---|---|---|---|---|
| John Cronin | Son | — | 11 | ~1929 |
| Mary Cronin | Daughter | — | 12 | ~1928 |
| Julia Cronin | Spouse | — | 39 | ~1901 |
| Catherine Cronin | Daughter | — | 14 | ~1926 |
| Thomas Cronin | Son | — | 13 | ~1927 |
| Robert Cronin | Son | — | 7 | ~1933 |
| Michael Cronin | Head | — | 45 | ~1895 |
| Joseph Cronin | Son | — | 4 | ~1936 |
| Francis Cronin | Son | — | 15 | ~1925 |
Census Appearances
1930
Worcester, Massachusetts
Son, age 1
Worcester, Massachusetts · implied b. ~1929 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cronin |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Can Read/Write | No |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Worcester-County, Massachusetts
Son, age 11
Worcester-County, Massachusetts · implied b. ~1929 — 9 household members
| Surname | Cronin |
| Given Name | John |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Worcester City |
| 1935 Residence (County) | Worcester |
| Industry | S |
| Highest Grade | H 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 John Cronin across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Cronin
Son · 1940 · age 11 · b. ~1929 · Massachusetts
★ You are viewing this record
Sibling
Thomas Cronin
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Francis Cronin
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Cronin
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Cronin
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Cronin
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Cronin
Sibling · 1940 · age 7
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 — Worcester-County, Massachusetts
Open full size
1940 US Federal Census — Worcester-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01715-00566)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Christina Milas | 14 | daughter | — | Massachusetts |
| 2 | Frank Zukas | 59 | head | Machinist | Lithuania |
| 3 | Catherine Zukas | 49 | wife | — | Lithuania |
| 4 | Anna Zukas | 24 | daughter | Stenographer | Massachusetts |
| 5 | Michael Cronin | 45 | head | Iron Worker | South Ireland |
| 6 | Julia Cronin | 39 | wife | — | South Ireland |
| 7 | Francis Cronin | 15 | son | — | Massachusetts |
| 8 | Catherine Cronin | 14 | daughter | — | Massachusetts |
| 9 | Thomas Cronin | 13 | son | — | Massachusetts |
| 10 | Mary Cronin | 12 | daughter | — | Massachusetts |
| 11 | John Cronin THIS PERSON | 11 | son | — | Massachusetts |
| 12 | Robert Cronin | 7 | son | — | Massachusetts |
| 13 | Joseph Cronin | 4 | son | — | Massachusetts |
| 14 | Anthony Yankus | 45 | head | Wire Drawer | Lithuania |
| 15 | Veronica Yankus | 45 | wife | — | Lithuania |
| 16 | Veronica Yankus | 21 | daughter | Housekeeper | Massachusetts |
| 17 | Leo Yankus | 20 | son | Clerk | Massachusetts |
| 18 | Mary Yankus | 16 | daughter | — | Massachusetts |
| 19 | Julia Yankus | 14 | daughter | — | Massachusetts |
| 20 | Monica Yankus | 13 | daughter | — | Massachusetts |
| 21 | Vesta Yankus | 11 | son | — | Massachusetts |
| 22 | Kazimir Aliasauskas | 54 | head | Cutter | Lithuania |
| 23 | Mary Aliasauskas | 54 | wife | — | Lithuania |
| 24 | Bernard Allen | 30 | son | Pharmacist | Lithuania |
| 25 | Gregory Polanik | 47 | head | Foreman | Poland |
| 26 | Helen Polanik | 47 | wife | — | Poland |
| 27 | Adam Polanik | 26 | son | Truck Driver | Massachusetts |
| 28 | Joseph Polanik | 23 | son | Tool Boy | Massachusetts |
| 29 | Helen Polanik | 21 | daughter | Machinist | Massachusetts |
| 30 | Francis Polanik | 18 | son | Chef | Massachusetts |
| 31 | John Polanik | 16 | son | — | Massachusetts |
| 32 | Mary Polanik | 14 | daughter | — | Massachusetts |
| 33 | Peter Polanik | 12 | son | — | Massachusetts |
| 34 | Teresa Polanik | 11 | daughter | — | Massachusetts |
| 35 | Gregory Polanik | 7 | son | — | Massachusetts |
| 36 | Max Grace | 72 | head | — | Russia |
| 37 | Sarah Grace | 66 | wife | — | Russia |
| 38 | Milly Harridan | 65 | lodger | — | Massachusetts |
| 39 | Ellen Sullivan | 40 | head | — | Massachusetts |
| 40 | Joseph Sullivan | 15 | son | — | 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)