JL
John Leary — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this John Leary across the 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1929), then head of a 7-person household.
Age 11
b. ~1929
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Leary |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Revere |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Highest Grade | 6 |
| 1935 Residence | Same house |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Revere |
| 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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Dorothy Leary | Daughter | — | 19 | ~1921 |
| Hilda Leary | Spouse | — | 39 | ~1901 |
| Walter Leary | Head | — | 42 | ~1898 |
| Walter Leary | Son | — | 15 | ~1925 |
| Margaret Leary | Daughter | — | 5 | ~1935 |
| Barbara Leary | Daughter | — | 17 | ~1923 |
| John Leary | Son | — | 11 | ~1929 |
Census Appearances
1930
Middlesex, Massachusetts
Son, age 1
Middlesex, Massachusetts · implied b. ~1929 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Leary |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Rhode Island |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Son, age 11
Suffolk-County, Massachusetts · implied b. ~1929 — 7 household members
| Surname | Leary |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Revere |
| 1935 Residence (County) | Suffolk |
| Highest Grade | 6 |
| 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 John Leary across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Leary
Son · 1940 · age 11 · b. ~1929 · Massachusetts
★ You are viewing this record
Sibling
Barbara Leary
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dorothy Leary
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Walter Leary
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Leary
Sibling · 1940 · age 5
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-t0627-01644-00359)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | George Brownell | 69 | Head | Carpenter | Canada English |
| 42 | Rose B Brownell | 42 | Wife | — | England |
| 43 | George Brownell | 15 | Son | — | Massachusetts |
| 44 | Arthur Brownell | 13 | Son | — | Massachusetts |
| 45 | John Brownell | 11 | Son | — | Massachusetts |
| 46 | Mildred Brownell | 7 | Daughter | — | Massachusetts |
| 47 | James A Spaulding | 42 | Head | Laborer | Michigan |
| 48 | Martha Spaulding | 32 | Wife | — | New York |
| 49 | Robert Spaulding | 14 | Son | — | Massachusetts |
| 50 | Joan Spaulding | 12 | Daughter | — | Massachusetts |
| 51 | Ronald Spaulding | 6 | Son | — | Massachusetts |
| 52 | Laura O'Sullivan | 62 | Head | — | Canada English |
| 53 | John O'Sullivan | 39 | Son | Carpenter | Massachusetts |
| 54 | Henrietta Bellanger | 49 | Head | Sewing | Massachusetts |
| 55 | Mary Kelley | 58 | Head | — | Massachusetts |
| 56 | Henry Kelley | 38 | Son | Copper Smith | Massachusetts |
| 57 | Helen Kelley | 34 | Daughter-in-law | — | Massachusetts |
| 58 | Loraine Kelley | 5 | Granddaughter | — | Massachusetts |
| 59 | Helene Adams | 39 | Daughter | — | Massachusetts |
| 60 | Maria E Blais | 51 | Head | Supervisor | Canada French |
| 61 | Lucille Blais | 23 | Daughter | — | Massachusetts |
| 62 | Kenneth Blais | 19 | Daughter | — | Massachusetts |
| 63 | Robert Blais | 16 | Son | — | Massachusetts |
| 64 | Mary Elwell | 55 | Head | Sewing | Massachusetts |
| 65 | Robert O Elwell | 34 | Son | Painter | Massachusetts |
| 66 | George Elwell | 18 | Son | Yard Boy | Massachusetts |
| 67 | Walter Leary | 42 | Head | Clerk | Massachusetts |
| 68 | Hilda C Leary | 39 | Wife | — | Massachusetts |
| 69 | Dorothy Leary | 19 | Daughter | — | Massachusetts |
| 70 | Barbara Leary | 17 | Daughter | — | Massachusetts |
| 71 | Walter Jr. Leary | 15 | Son | — | Massachusetts |
| 72 | John Leary THIS PERSON | 11 | Son | — | Massachusetts |
| 73 | Margaret Leary | 5 | Daughter | — | Massachusetts |
| 74 | John Ford | 43 | Head | Inspector | Massachusetts |
| 75 | Ruth Ford | 36 | Wife | — | Massachusetts |
| 76 | Ruth P. Ford | 11 | Daughter | — | Massachusetts |
| 77 | John Ford | 10 | Son | — | Massachusetts |
| 78 | Mary Ford | 8 | Daughter | — | Massachusetts |
| 79 | Elizabeth Moran | 69 | Mother-in-law | Companion | Canada English |
| 80 | J John Burns | 49 | Head | Fireman | 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)