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John Mccarthy — 1940 US Census Record
Model Tree available1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this John Mccarthy across the 1920, 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed), with identified parents William & John — first a head (b.~1909), then head of a 3-person household.
Age 31
b. ~1909
Male
Head
Born: Massachusetts
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | McCarthy |
| Given Name | John F |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Occupation | Police Officer |
| Industry | City |
| Class of Worker | GW |
| Hours Worked | 20 |
| Income (1939) | 604 |
| Highest Grade | H-4 |
| 1935 Residence | Same Place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Police Officer |
| Township / Ward | Boston City |
| Est. Birth Year | ~1909 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Eileen Mccarthy | Daughter | — | 5 | ~1935 |
| John Mccarthy | Head | — | 31 | ~1909 |
| Mary Mccarthy | Spouse | — | 31 | ~1909 |
Census Appearances
Son, age 10
Suffolk, Massachusetts · implied b. ~1910 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McCarty |
| Given Name | John F. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Suffolk, Massachusetts
Son, age 20
Suffolk, Massachusetts · implied b. ~1910 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McCarthy |
| Given Name | John F. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | Post Clerk |
| Industry | Insurance office |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Head, age 31
Suffolk-County, Massachusetts · implied b. ~1909 — 3 household members
| Surname | McCarthy |
| Given Name | John F |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Occupation | Police Officer |
| Industry | City |
| Class of Worker | GW |
| Hours Worked | 20 |
| Income (1939) | 604 |
| 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 Mccarthy across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father William Mccarty (~0.92 confidence) and father John Mccarthy (~0.92 confidence) and mother Nellie Mccarty (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
William Mccarty
b. ~1875
Source father
● Household
· direct · ~0.92
Father
John Mccarthy
b. ~1878
Source father
● Household
· direct · ~0.92
Mother
Nellie Mccarty
b. ~1885
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Mccarthy
Head · 1940 · age 31 · b. ~1909 · Massachusetts
★ You are viewing this record
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-t0627-01680-00148)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Delia A Lyons | 60 | Head | — | Irish Free State |
| 2 | Martin J Lyons | 35 | Son | Manager | Massachusetts |
| 3 | George H Lyons | 33 | Son | Doctor | Massachusetts |
| 4 | Theodore Lyons | 30 | Son | Councillor | Massachusetts |
| 5 | James Lyons | 25 | Son | Investigator | Massachusetts |
| 6 | Francis X Lyons | 22 | Son | Clerk | Massachusetts |
| 7 | John F Mccarthy THIS PERSON | 31 | Head | Police Officer | Massachusetts |
| 8 | Mary E Mccarthy | 31 | Wife | — | Massachusetts |
| 9 | Eileen Mccarthy | 5 | Daughter | — | Massachusetts |
| 10 | John J Macisaac | 69 | Head | — | Canada-English |
| 11 | Mary G Macisaac | 66 | Wife | — | Massachusetts |
| 12 | Anna L Macisaac | 37 | Daughter | Clerical Supervisor | Massachusetts |
| 13 | John L Macisaac | 35 | Son | Supervisor | Massachusetts |
| 14 | Mildred Macisaac | 30 | Daughter | Secretary | Massachusetts |
| 15 | Dorothy Macisaac | 28 | Daughter | Secretary | Massachusetts |
| 16 | Edward J Green | 37 | Head | Steam Fitter | Massachusetts |
| 17 | Edith Green | 38 | Wife | — | Massachusetts |
| 18 | Norman E Green | 7 | Son | — | Massachusetts |
| 19 | Frank J Benford | 48 | Head | Fireman | Massachusetts |
| 20 | Louise Benford | 46 | Wife | — | Massachusetts |
| 21 | John D Weissman | 50 | Head | Carpenter | Massachusetts |
| 22 | Isabelle Weissman | 50 | Wife | — | Swedish |
| 23 | Joseph Burwen | 46 | Head | Owner | Massachusetts |
| 24 | Rosa Burwen | 45 | Wife | — | Massachusetts |
| 25 | Alta Burwen | 18 | Daughter | — | Massachusetts |
| 26 | Leroy Burwen | 16 | Son | — | Massachusetts |
| 27 | Lois Burwen | 12 | Daughter | — | Massachusetts |
| 28 | Arthur Billings | 38 | Head | Accountant | Massachusetts |
| 29 | Dorothy Billings | 34 | Wife | — | Massachusetts |
| 30 | Herbert Dyer | 48 | Head | Police Sergeant | Massachusetts |
| 31 | Lois Dyer | 35 | Wife | — | Massachusetts |
| 32 | Arthur J Maynard | 47 | Head | Superintendent | Massachusetts |
| 33 | Charlotte Maynard | 51 | Wife | — | Massachusetts |
| 34 | Marguerite Maynard | 21 | Daughter | Clerk | Massachusetts |
| 35 | Marie G Cooke | 49 | Head | Teacher | Massachusetts |
| 36 | Dorothy M Cooke | 21 | Daughter | Teacher | Massachusetts |
| 37 | Alfred C Humberger | 33 | Head | Draftsman | New Hampshire |
| 38 | Dorothy A Humberger | 33 | Wife | Research Assistant | Massachusetts |
| 39 | William R Gelpke | 61 | Head | Insurance Councillor | Massachusetts |
| 40 | Margaret M Gelpke | 61 | Wife | — | Irish Free State |
Related Census Records
Pedigree Summary
John
Gen 1 · 3 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)