JC
John Carroll — 1940 US Census Record
Model Tree available1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this John Carroll across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents John & John — first a son (b.~1916), then head of a 3-person household.
Age 24
b. ~1916
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Carroll |
| Given Name | John |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | City of Somerville |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Occupation | camera operator |
| Industry | moving pictures |
| Class of Worker | PW |
| Hours Worked | 50 |
| Income (1939) | 1250 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Camera Operator |
| Township / Ward | City Of Somerville |
| 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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Grace Carroll | Daughter | — | 39 | ~1901 |
| John Carroll | Head | — | 64 | ~1876 |
| John Carroll | Son | — | 24 | ~1916 |
Census Appearances
1920
Middlesex, Massachusetts
Son, age 3
Middlesex, Massachusetts · implied b. ~1917 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Carroll |
| Given Name | John |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Son, age 14
Middlesex, Massachusetts · implied b. ~1916 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Carroll |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Son, age 24
Middlesex-County, Massachusetts · implied b. ~1916 — 3 household members
| Surname | Carroll |
| Given Name | John |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | City of Somerville |
| 1935 Residence (County) | Middlesex |
| Occupation | camera operator |
| Industry | moving pictures |
| Class of Worker | PW |
| Hours Worked | 50 |
| Income (1939) | 1250 |
| 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 Carroll across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Carroll (~0.92 confidence) and father John Carroll (~0.92 confidence) and mother Emma Carroll (~0.92 confidence) and father John Carroll (~0.92 confidence) and mother Mary Carroll (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Carroll
b. ~1876
Source father
● Household
· direct · ~0.92
Father
John Carroll
b. ~1876
Source father
● Household
· direct · ~0.92
Mother
Emma Carroll
b. ~1887
Source mother
● Household
· direct · ~0.92
Father
John Carroll
b. ~1890
Source father
● Household
· direct · ~0.92
Mother
Mary Carroll
b. ~1891
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Carroll
Son · 1940 · age 24 · b. ~1916 · Massachusetts
★ You are viewing this record
Sibling
Grace Carroll
Sibling · 1940 · age 39
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 — Middlesex-County, Massachusetts
Open full size
1940 US Federal Census — Middlesex-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01702-00825)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Mary Battit | 12 | daughter | — | Massachusetts |
| 2 | Mary Battit | 51 | mother-in-law | Dressmaker | Syria |
| 3 | William Truell | 42 | Head | Chauffeur | Massachusetts |
| 4 | Mary Truell | 32 | wife | Packer | Massachusetts |
| 5 | Francis Truell | 30 | brother-in-law | Rubber Worker | Massachusetts |
| 6 | Henry Cornette | 54 | Head | Machinist | Massachusetts |
| 7 | Mary Cornette | 54 | wife | — | Canada-English |
| 8 | William Riley | 35 | Head | Sealer | Massachusetts |
| 9 | Elizabeth Riley | 42 | wife | — | Massachusetts |
| 10 | Phyllis Edwards | 18 | daughter | Clerk | Massachusetts |
| 11 | Maria R. Keane | 66 | Head | — | Eire |
| 12 | Margaret Keane | 30 | daughter | Switch Board Operator | Massachusetts |
| 13 | Edmund Keane | 28 | son | Clerk | Massachusetts |
| 14 | Robert Mcmahon | 32 | son-in-law | Clerk | Massachusetts |
| 15 | Mary Mcmahon | 26 | daughter | — | Massachusetts |
| 16 | Robert Mcmahon | 19 | grandson | Inspector | Massachusetts |
| 17 | Francis Mcmahon | 1 | grandson | — | Massachusetts |
| 18 | Harold Towle | 32 | Head | Manager | Rhode Island |
| 19 | Mildred Towle | 28 | sister | Counter Girl | Massachusetts |
| 20 | Elizabeth Towle | 67 | aunt | — | Massachusetts |
| 21 | Ethel Staples | 39 | sister | — | Rhode Island |
| 22 | Frederick Staples | 17 | nephew | — | Massachusetts |
| 23 | Amos Panza | 73 | Head | — | Massachusetts |
| 24 | Lavinia Panza | 72 | wife | — | Canada-English |
| 25 | John Carroll | 64 | Head | Nightwatchman | Eire |
| 26 | Grace Carroll | 39 | daughter | — | Massachusetts |
| 27 | John Carroll THIS PERSON | 24 | son | Camera Operator | Massachusetts |
| 28 | William Chisholm | 52 | Head | Cooper | Massachusetts |
| 29 | Elizabeth Chisholm | 57 | wife | — | Massachusetts |
| 30 | William Chisholm | 24 | son | Clerk | Massachusetts |
| 31 | Ellen Johnson | 55 | sister-in-law | Packer | Massachusetts |
| 32 | Margaret Hunt | 50 | sister-in-law | Box Maker | Massachusetts |
| 33 | William Hunt | 26 | nephew | Salesman | Massachusetts |
| 34 | Thomas Hunt | 24 | nephew | Electrician | Massachusetts |
| 35 | Margaret Brady | 29 | niece | Switch Board Operator | Massachusetts |
| 36 | Herbert Cruickshank | 44 | Head | Repairman | Massachusetts |
| 37 | Edna Cruickshank | 34 | wife | — | Massachusetts |
| 38 | Dora Fallon | 43 | Head | — | Canada-English |
| 39 | Carolyn Fallon | 16 | daughter | — | Massachusetts |
| 40 | Donald Fallon | 10 | son | — | Massachusetts |
Pedigree Summary
John + 1 sibling
Gen 1 · 5 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)