JC
John Carroll — 1940 US Census Record
Model Tree available1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this John Carroll across the 1920, 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Neil & Hannah — first a son (b.~1913), then head of a 4-person household.
Age 27
b. ~1913
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Carroll |
| Given Name | John M. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Occupation | Real Estate Assistant |
| Industry | Boston Public Library |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 1700 |
| Highest Grade | C 4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Real Estate Assistant |
| Township / Ward | Boston City |
| Est. Birth Year | ~1913 |
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 John | Age | Birth yr |
|---|---|---|---|---|
| Margaret Carroll | Daughter | — | 31 | ~1909 |
| Mary Carroll | Head | — | 60 | ~1880 |
| John Carroll | Son | — | 27 | ~1913 |
| Joseph Carroll | Son | — | 30 | ~1910 |
Census Appearances
1920
Suffolk, Massachusetts
Son, age 5
Suffolk, Massachusetts · implied b. ~1915 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Carroll |
| Given Name | John |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | none |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Suffolk, Massachusetts
Son, age 15
Suffolk, Massachusetts · implied b. ~1915 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Carroll |
| Given Name | John A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Laborer |
| Industry | Contractor |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Son, age 27
Suffolk-County, Massachusetts · implied b. ~1913 — 4 household members
| Surname | Carroll |
| Given Name | John M. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Occupation | Real Estate Assistant |
| Industry | Boston Public Library |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 1700 |
| Highest Grade | C 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 Neil Carroll (~0.92 confidence) and mother Hannah Carroll (~0.92 confidence) and father James Carroll (~0.92 confidence) and mother Mary 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
Neil Carroll
b. ~1878
Source father
● Household
· direct · ~0.92
Mother
Hannah Carroll
b. ~1878
Source mother
● Household
· direct · ~0.92
Father
James Carroll
b. ~1880
Source father
● Household
· direct · ~0.92
Mother
Mary Carroll
b. ~1880
Source mother
● Household
· direct · ~0.92
Mother
Mary Carroll
b. ~1890
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Carroll
Son · 1940 · age 27 · b. ~1913 · Massachusetts
★ You are viewing this record
Sibling
Joseph Carroll
Sibling · 1940 · age 30
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Carroll
Sibling · 1940 · age 31
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-t0627-01673-00105)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Mary A. Carroll | 60 | Head | — | Irish Free State |
| 2 | Margaret C. Carroll | 31 | Daughter | Teacher | Massachusetts |
| 3 | Joseph F. Carroll | 30 | Son | Clerk | Massachusetts |
| 4 | John M. Carroll THIS PERSON | 27 | Son | Real Estate Assistant | Massachusetts |
| 5 | Benjamin Kaplan | 32 | Head | Chauffeur | Massachusetts |
| 6 | Charlotte Kaplan | 24 | Wife | — | Massachusetts |
| 7 | Irwin M. Kaplan | 1 | Son | — | Massachusetts |
| 8 | Margaret H. Patterson | 18 | Maid | Maid Housework | Massachusetts |
| 9 | Max Marcus | 38 | Head | Salesman | Poland |
| 10 | Betty Marcus | 34 | Wife | — | Massachusetts |
| 11 | Jennie Coris | 53 | Head | — | Russia |
| 12 | Frances Coris | 22 | Daughter | Bookkeeper | Massachusetts |
| 13 | Carl Hannington | 58 | Lodger | — | Poland |
| 14 | Herbert Hannington | 21 | Lodger | Travelling Salesman | Massachusetts |
| 15 | Maurice Horowitz | 56 | Head | Insurance Agent | Russia |
| 16 | Sarah Horowitz | 51 | Wife | — | Russia |
| 17 | Allan Parker | 30 | Head | Billing Clerk | Massachusetts |
| 18 | Rebecca Parker | 27 | Wife | — | Massachusetts |
| 19 | Brenda P. Parker | 0 | Daughter | — | Massachusetts |
| 20 | Abraham Fishman | 58 | Head | Fur Cutter | Russia |
| 21 | Minnie Fishman | 59 | Wife | — | Canada |
| 22 | Harold Rosenberg | 31 | Head | Pharmacist | Massachusetts |
| 23 | Frances Rosenberg | 24 | Wife | — | Massachusetts |
| 24 | Richard D. Rosenberg | 4 | Son | — | Massachusetts |
| 25 | Arthur Berman | 43 | Father | Salesman | Massachusetts |
| 26 | Irene Berman | 42 | Wife | Manager | Massachusetts |
| 27 | Samuel J. Mills | 40 | Head | Salesman | Russia |
| 28 | Minnie Mills | 37 | Wife | — | Russia |
| 29 | Beverly Mills | 16 | Daughter | — | Massachusetts |
| 30 | William Mills | 13 | Son | — | Massachusetts |
| 31 | Paul E. Mills | 11 | Son | — | Massachusetts |
| 32 | Ernest Mills | 9 | Son | — | Massachusetts |
| 33 | Rose Jaffe | 65 | Head | — | Lithuania |
| 34 | Jacob Werlin | 48 | Son-in-law | Salesman | Russia |
| 35 | Lily Werlin | 39 | Daughter | Saleslady | New York |
| 36 | Selma Werlin | 13 | Daughter | — | Massachusetts |
| 37 | Robert Werlin | 9 | Grandson | — | Massachusetts |
| 38 | Morris Brown | 50 | Head | Stitcher | Poland |
| 39 | Celia Brown | 44 | Wife | Saleslady | Poland |
| 40 | Abraham Romney | 22 | Lodger | — | Massachusetts |
Pedigree Summary
John + 2 siblings
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)