JC
John Carroll — 1940 US Census Record
Model Tree available1940 United States Federal Census · Marion-County, Indiana
Our Model Tree links this John Carroll across the 1920, 1930 and 1940 US Censuses in Marion-County, Indiana (XGBoost, ~Confirmed), with identified parents John & Ellen — first a son (b.~1920), then head of a 5-person household.
Age 20
b. ~1920
Male
Son
Born: Indiana
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Marion-County, Indiana |
| Surname | Carroll |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Indianapolis City |
| 1935 Residence (County) | Marion |
| Additional Details | |
| Occupation | Delivery Boy |
| Industry | Market |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 650 |
| Highest Grade | H-4 |
| 1935 Residence | Same House |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
| Occupation | Delivery Boy |
| Township / Ward | Indianapolis City |
| Est. Birth Year | ~1920 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Carroll | Head | — | 56 | ~1884 |
| Dennis Casserly | Other | — | 56 | ~1884 |
| James Carroll | Son | — | 24 | ~1916 |
| John Carroll | Son | — | 20 | ~1920 |
| Ellen Carroll | Spouse | — | 56 | ~1884 |
Census Appearances
1920
Marion, Indiana
Son, age 1
Marion, Indiana · implied b. ~1919 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Carroll |
| Given Name | John |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | none |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1930
Marion, Indiana
Son, age 11
Marion, Indiana · implied b. ~1919 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Carroll |
| Given Name | John Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read/Write | Yes |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1940
Marion-County, Indiana
Son, age 20
Marion-County, Indiana · implied b. ~1920 — 5 household members
| Surname | Carroll |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Indianapolis City |
| 1935 Residence (County) | Marion |
| Occupation | Delivery Boy |
| Industry | Market |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 650 |
| Highest Grade | H-4 |
| 1935 Residence | Same House |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
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 mother Ellen Carroll (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Carroll
b. ~1884
Source father
● Household
· direct · ~0.92
Mother
Ellen Carroll
b. ~1884
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Carroll
Son · 1940 · age 20 · b. ~1920 · Indiana
★ You are viewing this record
Sibling
James Carroll
Sibling · 1940 · age 24
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 — Marion-County, Indiana
Open full size
1940 US Federal Census — Marion-County, Indiana
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01126-00615)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Le Roy A. Carpenter | 58 | Head | Proof Reader | Missouri |
| 2 | Winnie Carpenter | 57 | Wife | — | Indiana |
| 3 | Iris Lynch | 33 | Daughter | Teacher | Indiana |
| 4 | Nancy Lynch | 3 | Daughter | — | Indiana |
| 5 | Alice Grass | 77 | Mother-in-law | — | Indiana |
| 6 | Charles L. Thomas | 43 | Head | Superintendent | Indiana |
| 7 | Ramona Thomas | 43 | Wife | — | Indiana |
| 8 | Harry Robbins | 22 | Nephew | Laborer | Indiana |
| 9 | Arthur Hertzman | 30 | Head | Meat Cutter | Illinois |
| 10 | Llewellyn Hertzman | 26 | Wife | — | Illinois |
| 11 | Phyllis Hertzman | 3 | Daughter | — | Indiana |
| 12 | Neal Houston | 33 | Lodger | Florist | Illinois |
| 13 | Harry A. Wilson | 40 | Head | Salesman | Virginia |
| 14 | Helen O. Wilson | 40 | Wife | — | Indiana |
| 15 | Robert C. Wilson | 19 | Son | Messenger | Indiana |
| 16 | Harry L. Wilson | 17 | Son | — | Indiana |
| 17 | John J. Carroll | 56 | Head | — | Ireland |
| 18 | Ellen D. Carroll | 56 | Wife | — | Ireland |
| 19 | James Carroll | 24 | Son | Truck Driver | Indiana |
| 20 | John Carroll THIS PERSON | 20 | Son | Delivery Boy | Indiana |
| 21 | Dennis Casserly | 56 | Brother-in-law | Laborer | Ireland |
| 22 | Michael Carroll | 62 | Head | Laborer | Ireland |
| 23 | Mary J. Carroll | 54 | Wife | — | Ireland |
| 24 | Pearl M. Carroll | 30 | Daughter | Stenographer | Scotland |
| 25 | George C. Duell | 55 | Head | Brakeman | Kentucky |
| 26 | Rose M. Duell | 51 | Wife | — | Indiana |
| 27 | George L. Duell | 26 | Son | Butcher | Indiana |
| 28 | Dorothy L. Duell | 18 | Son | — | Indiana |
| 29 | Louise E. Duell | 11 | Daughter | — | Indiana |
| 30 | John Shanahan | 54 | Head | Clerk | Ireland |
| 31 | Cecelia Shanahan | 53 | Wife | — | Ireland |
| 32 | John J. Shanahan | 21 | Son | Janitor | Indiana |
| 33 | Vincent Shanahan | 18 | Son | Laborer | Indiana |
| 34 | Paul Shanahan | 10 | Son | — | Indiana |
| 35 | William E. Dixon | 41 | Head | Machinist | Indiana |
| 36 | Emma P. Dixon | 36 | Wife | — | Kentucky |
| 37 | William Elmer Dixon | 16 | Son | — | Indiana |
| 38 | Alice Lee Dixon | 14 | Daughter | — | Indiana |
| 39 | Richard Hastings | 23 | Head | Shipping Clerk | Indiana |
| 40 | Evelyn Hastings | 21 | Wife | Stenographer | Indiana |
Pedigree Summary
John + 1 sibling
Gen 1 · 2 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)