JM
James Mccarthy — 1940 US Census Record
Model Tree available1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this James Mccarthy across the 1920, 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Mary & Timothy — first a son (b.~1916), then head of a 4-person household.
Age 24
b. ~1916
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | McCarthy |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Occupation | Plumber |
| Industry | Plumbing |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 1040 |
| Highest Grade | H 4 |
| 1935 Residence | Same house |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Plumber |
| Township / Ward | Boston |
| Est. Birth Year | ~1916 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| Mary Mccarthy | Head | — | 55 | ~1885 |
| Margaret Mccarthy | Other | — | 23 | ~1917 |
| Thomas Mccarthy | Son | — | 26 | ~1914 |
| James Mccarthy | Son | — | 24 | ~1916 |
Census Appearances
1920
Suffolk, Massachusetts
Son, age 1
Suffolk, Massachusetts · implied b. ~1919 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McCarthy |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Suffolk, Massachusetts
Son, age 12
Suffolk, Massachusetts · implied b. ~1918 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McCarthy |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Age at First Marriage | W |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Son, age 24
Suffolk-County, Massachusetts · implied b. ~1916 — 4 household members
| Surname | McCarthy |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston |
| 1935 Residence (County) | Suffolk |
| Occupation | Plumber |
| Industry | Plumbing |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 1040 |
| Highest Grade | H 4 |
| 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 James Mccarthy across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Mary Mccarthy (~0.92 confidence) and father Timothy Mccarthy (~0.92 confidence) and father James Mccarthy (~0.92 confidence) and mother Anna Mccarthy (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Mary Mccarthy
b. ~1885
Source mother
● Household
· direct · ~0.92
Father
Timothy Mccarthy
b. ~1886
Source father
● Household
· direct · ~0.92
Father
James Mccarthy
b. ~1889
Source father
● Household
· direct · ~0.92
Mother
Anna Mccarthy
b. ~1892
Source mother
● Household
· direct · ~0.92
This person
Anchor record
James Mccarthy
Son · 1940 · age 24 · b. ~1916 · Massachusetts
★ You are viewing this record
Sibling
Thomas Mccarthy
Sibling · 1940 · age 26
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-t0627-01666-00305)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | James Davis | 10 | Son | — | Massachusetts |
| 42 | William Davis | 9 | Son | — | Massachusetts |
| 43 | Blanche Davis | 7 | Daughter | — | Massachusetts |
| 44 | Milton T. Wilson | 31 | Head | Gospel Minister | Kansas |
| 45 | Gussie Wilson | 32 | Wife | — | Tennessee |
| 46 | Milton T. Jr. Wilson | 6 | Son | — | Tennessee |
| 47 | Ernestine Wilson | 4 | Daughter | — | Illinois |
| 48 | Mildrene Wilson | 2 | Daughter | — | Pennsylvania |
| 49 | Rosetta M. Wilson | 0 | Daughter | — | Massachusetts |
| 50 | E. Rosetta | 52 | Mother | — | Kansas |
| 51 | Amanda Green | 59 | Head | Cook | North Carolina |
| 52 | Alberta Hargrove | 45 | Sister | Cook | North Carolina |
| 53 | Evelyn Barbara | 17 | Niece | Ironer | North Carolina |
| 54 | Isadore Decruze | 42 | Roomer | Laborer | Portugal |
| 55 | Eva L. Beigen | 45 | Head | — | Georgia |
| 56 | John O'Neil | 19 | Head | Carpenter | Massachusetts |
| 57 | Helen O'Neil | 18 | Wife | — | Massachusetts |
| 58 | Herbert Holmes | 33 | Head | Dishwasher | New York |
| 59 | Marie Holmes | 21 | Wife | — | Massachusetts |
| 60 | Marie Holmes | 1 | Daughter | — | Massachusetts |
| 61 | Anthony Vangemert | 52 | Head | Printing Superintendent | Holland |
| 62 | Rebecca Vangemert | 44 | Sister | — | Michigan |
| 63 | Patrick Hanlon | 28 | Head | Laborer | Massachusetts |
| 64 | Mary Hanlon | 28 | Wife | — | Massachusetts |
| 65 | Charles Hanlon | 8 | Son | — | Massachusetts |
| 66 | Patricia Hanlon | 4 | Daughter | — | Massachusetts |
| 67 | John Hanlon | 2 | Son | — | Massachusetts |
| 68 | Margaret Hanlon | 55 | Mother | — | Eire |
| 69 | Mary Fox | 37 | Head | — | Massachusetts |
| 70 | Alice Fox | 16 | Daughter | New Worker | Massachusetts |
| 71 | Frances Fox | 14 | Daughter | — | Massachusetts |
| 72 | Madeline Fox | 13 | Daughter | — | Massachusetts |
| 73 | Mary Fox | 11 | Daughter | — | Massachusetts |
| 74 | John Fox | 8 | Son | — | Massachusetts |
| 75 | Albertine Pike | 31 | Head | Machine Op. | Massachusetts |
| 76 | Alvin Dion | 32 | Roomer | Rubber Worker | Massachusetts |
| 77 | Mary Mccarthy | 55 | Head | — | Massachusetts |
| 78 | James Mccarthy THIS PERSON | 24 | Son | Plumber | Massachusetts |
| 79 | Thomas Mccarthy | 26 | Son | Laborer | Massachusetts |
| 80 | Margaret Mccarthy | 23 | Daughter in law | — | Massachusetts |
Pedigree Summary
James + 1 sibling
Gen 1 · 4 parents
~0.92
Max depth 4 (1900–1950 window)
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)