JC
John Carroll — 1940 US Census Record
Model Tree available1940 United States Federal Census · Union-County, New Jersey
Our Model Tree links this John Carroll across the 1920, 1930 and 1940 US Censuses in Union-County, New Jersey (XGBoost, ~Confirmed), with identified parents Joseph & Catherine — first a son (b.~1905), then head of a 5-person household.
Age 35
b. ~1905
Male
Son
Born: New Jersey
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Union-County, New Jersey |
| Surname | Carroll |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | Elizabeth city |
| 1935 Residence (County) | Union |
| Additional Details | |
| Occupation | Bookkeeper |
| Industry | Local Water Co. |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 2106 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Occupation | Bookkeeper |
| Township / Ward | Elizabeth City |
| Est. Birth Year | ~1905 |
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 |
|---|---|---|---|---|
| Mary Carroll | Daughter | — | 23 | ~1917 |
| Catherine Carroll | Head | — | 66 | ~1874 |
| John Carroll | Son | — | 35 | ~1905 |
| Raymond Carroll | Son | — | 28 | ~1912 |
| Lawrence Carroll | Son | — | 23 | ~1917 |
Census Appearances
1920
Union, New …
Son, age 14
Union, New Jersey · implied b. ~1906 — 10 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 | New Jersey |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1930
Union, New …
Son, age 22
Union, New Jersey · implied b. ~1908 — 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 | 22 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Bookkeeper |
| Industry | Water Co. |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1940
Union-County, New …
Son, age 35
Union-County, New Jersey · implied b. ~1905 — 5 household members
| Surname | Carroll |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | Elizabeth city |
| 1935 Residence (County) | Union |
| Occupation | Bookkeeper |
| Industry | Local Water Co. |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 2106 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
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 Joseph Carroll (~0.92 confidence) and mother Catherine Carroll (~0.92 confidence) and mother Catherine Carroll (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Joseph Carroll
b. ~1867
Source father
● Household
· direct · ~0.92
Mother
Catherine Carroll
b. ~1874
Source mother
● Household
· direct · ~0.92
Mother
Catherine Carroll
b. ~1875
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Carroll
Son · 1940 · age 35 · b. ~1905 · New Jersey
★ You are viewing this record
Sibling
Mary Carroll
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Raymond Carroll
Sibling · 1940 · age 28
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lawrence Carroll
Sibling · 1940 · age 23
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 — Union-County, New Jersey
Open full size
1940 US Federal Census — Union-County, New Jersey
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02399-00540)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | William Hofstetter | 77 | Father in law | — | Germany |
| 42 | Ends Here | None | BLOCK | — | — |
| 43 | William T. Mcgeachie | 65 | Head | Trav. Salesman | Canada English |
| 44 | Bessie B. Mcgeachie | 61 | Wife | — | Delaware |
| 45 | Leroy J. Moran | 29 | Son in law | Mechanical Engineer | New Jersey |
| 46 | Ruth Moran | 25 | Daughter | — | New Jersey |
| 47 | Ends Here | None | BLOCK | — | — |
| 48 | Augustus J. E. Flynn | 56 | Head | Investigator | New Jersey |
| 49 | Bessie B. Flynn | 24 | Sister | Secretary | New Jersey |
| 50 | Mary A. Flynn | 52 | Sister | Stenographer | New Jersey |
| 51 | Lula Wren | 52 | Housekeeper | Housekeeper | Canada English |
| 52 | Leroy Culver | 42 | Head | Supt. Of Distribution | Michigan |
| 53 | Hope Culver | 41 | Wife | — | Michigan |
| 54 | Constance Culver | 9 | Daughter | — | Michigan |
| 55 | Sarah Culver | 7 | Daughter | — | Michigan |
| 56 | Anna H. Atkins | 64 | Mother in law | — | Michigan |
| 57 | Ends Here | None | BLOCK | — | — |
| 58 | Evan M. Jennings | 63 | Head | — | New York |
| 59 | Howard T. A. Jennings | 40 | Son | Supt. Marine Dept. | New Jersey |
| 60 | Cecelia Jennings | 37 | Daughter in law | Teacher | New York |
| 61 | Betty J. Jennings | 11 | Grand Daughter | — | Illinois |
| 62 | Grace Delbier | 46 | Head | — | New Jersey |
| 63 | Charles Delbier | 18 | Son | Messenger | New Jersey |
| 64 | Theodore Wilberch | 53 | Lodger | Salesman | Sweden |
| 65 | Catherine Carroll | 66 | Head | — | Eire |
| 66 | John Carroll THIS PERSON | 35 | Son | Bookkeeper | New Jersey |
| 67 | Raymond Carroll | 28 | Son | Messenger | New Jersey |
| 68 | Lawrence Carroll | 23 | Son | Helper | New Jersey |
| 69 | Mary R. Carroll | 23 | Daughter | Telephone Operator | New Jersey |
| 70 | Thomas Harvey | 56 | Head | Architect | Scotland |
| 71 | Loretta Harvey | 53 | Wife | Principal | Wisconsin |
| 72 | Cecelia O'Hara | 58 | Head | — | New Jersey |
| 73 | Hubert J. O'Hara | 41 | Husband | Adjuster | Connecticut |
| 74 | Helen Kiernan | 75 | Mother | — | Eire |
| 75 | Mary Kiernan | 46 | Sister | Bill Clerk | New Jersey |
| 76 | Helen Kiernan | 40 | Sister | Stenographer | New Jersey |
| 77 | Frank Buettner | 50 | Head | Foreman Machinist | New Jersey |
| 78 | Louise Buettner | 44 | Wife | — | New Jersey |
| 79 | Louise Buettner | 14 | Daughter | — | New Jersey |
| 80 | Lloyd Demange | 44 | Head | Cage Teller | New Jersey |
Pedigree Summary
John + 3 siblings
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)