JM
John Mccarty — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this John Mccarty across the 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1924), then head of a 8-person household.
Age 16
b. ~1924
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | McCarty |
| Given Name | John J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston city |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Highest Grade | H-2 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Boston City |
| Est. Birth Year | ~1924 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Eileen Mccarty | Daughter | — | 9 | ~1931 |
| John Mccarty | Head | — | 44 | ~1896 |
| Joseph Mccarty | Son | — | 7 | ~1933 |
| Thas Mccarty | Son | — | 15 | ~1925 |
| Francis Mccarty | Son | — | 11 | ~1929 |
| John Mccarty | Son | — | 16 | ~1924 |
| Eugene Mccarty | Son | — | 13 | ~1927 |
| Ruth Mccarty | Spouse | — | 46 | ~1894 |
Census Appearances
1930
Suffolk, Massachusetts
Son, age 5
Suffolk, Massachusetts · implied b. ~1925 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McCarthy |
| Given Name | John J |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | none |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Son, age 16
Suffolk-County, Massachusetts · implied b. ~1924 — 8 household members
| Surname | McCarty |
| Given Name | John J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston city |
| 1935 Residence (County) | Suffolk |
| Highest Grade | H-2 |
| 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 Mccarty across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Mccarty
Son · 1940 · age 16 · b. ~1924 · Massachusetts
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Sibling
Francis Mccarty
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eileen Mccarty
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thas Mccarty
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Mccarty
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eugene Mccarty
Sibling · 1940 · age 13
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-t0627-01680-00358)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Timothy J. O'Brien | 37 | Head | Laborer | Massachusetts |
| 2 | Joseph M. O'Brien | 37 | Brother | Machinist | Massachusetts |
| 3 | William O'Brien | 33 | Brother | Steam Fitter | Massachusetts |
| 4 | Ellen M. Kirby | 84 | Servant | Servant | Massachusetts |
| 5 | Constantine Peculis | 47 | Head | Mechanic | Lithuania |
| 6 | Mary Peculis | 31 | Wife | — | Massachusetts |
| 7 | William J. Peculis | 2 | Son | — | Massachusetts |
| 8 | George M. Peculis | 1 | Daughter | — | Massachusetts |
| 9 | Julia D. Baaty | 67 | Head | — | Massachusetts |
| 10 | Mary E. Baaty | 53 | Lodger | Clerk | Massachusetts |
| 11 | John H. Mccarty | 44 | Head | Lieutenant | Massachusetts |
| 12 | Ruth E. Mccarty | 46 | Wife | — | New Hampshire |
| 13 | John J. Mccarty THIS PERSON | 16 | Son | — | Massachusetts |
| 14 | Thas E. Mccarty | 15 | Son | — | Massachusetts |
| 15 | Eugene Mccarty | 13 | Son | — | Massachusetts |
| 16 | Francis J. Mccarty | 11 | Son | — | Massachusetts |
| 17 | Eileen R. Mccarty | 9 | Daughter | — | Massachusetts |
| 18 | Joseph H. Mccarty | 7 | Son | — | Massachusetts |
| 19 | Margaret Lulkin | 62 | Head | — | New York |
| 20 | Joseph F. Lulkin | 37 | Son | Salesman | Massachusetts |
| 21 | Agnes M. Lulkin | 32 | Daughter | Clerk | Massachusetts |
| 22 | Edward J. Lulkin | 28 | Son | Secretary | Massachusetts |
| 23 | Lillian D. Luce | 70 | Head | — | Maine |
| 24 | Bernice M. Morse | 34 | Daughter | Clerk | Maine |
| 25 | Alice G. Morse | 13 | Granddaughter | News Usher | Massachusetts |
| 26 | Hannah Coombs | 33 | Head | — | Massachusetts |
| 27 | Margaret F. Coombs | 12 | Daughter | — | Massachusetts |
| 28 | Ethel M. Coombs | 11 | Daughter | — | Massachusetts |
| 29 | Dorothy M. Coombs | 9 | Daughter | — | Massachusetts |
| 30 | Paul R. Coombs | 5 | Son | — | Massachusetts |
| 31 | Ella S. Grainger | 40 | Head | — | Massachusetts |
| 32 | Evelyn S. Grainger | 18 | Daughter | Secretary | Massachusetts |
| 33 | Dorothy Grainger | 16 | Daughter | — | Massachusetts |
| 34 | Gladys Grainger | 11 | Daughter | — | Massachusetts |
| 35 | Walter G. Grainger | 7 | Son | — | Massachusetts |
| 36 | Paul Simms | 55 | Lodger | — | Germany |
| 37 | Alfred Simms | 55 | Lodger | — | Germany |
| 38 | John J. Galvin | 39 | Head | Supervisor | Montana |
| 39 | Louise D. Galvin | 37 | Wife | Clerk | Massachusetts |
| 40 | Emma G. Eisner | 55 | Mother-in-law | — | Germany |
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)