JC
James Carroll — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Scott-County, Iowa
Our Model Tree links this James Carroll across the 1930 and 1940 US Censuses in Scott-County, Iowa (XGBoost, ~Confirmed) — first a son (b.~1930), then head of a 10-person household.
Age 10
b. ~1930
Male
Son
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Scott-County, Iowa |
| Surname | Carroll |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Davenport City |
| 1935 Residence (County) | Scott |
| Additional Details | |
| Highest Grade | No 4 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Davenport City |
| Est. Birth Year | ~1930 |
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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| Mary Carroll | Daughter | — | 15 | ~1925 |
| Gertrude Carroll | Daughter | — | 24 | ~1916 |
| Margaret Carroll | Daughter | — | 19 | ~1921 |
| Robert Carroll | Head | — | 56 | ~1884 |
| Charles Berg | Other | — | 81 | ~1859 |
| Paul Carroll | Son | — | 20 | ~1920 |
| James Carroll | Son | — | 10 | ~1930 |
| Richard Carroll | Son | — | 12 | ~1928 |
| John Carroll | Son | — | 21 | ~1919 |
| Linnea Carroll | Spouse | — | 53 | ~1887 |
Census Appearances
1930
Scott, Iowa
Son, age 1
Scott, Iowa · implied b. ~1929 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Carroll |
| Given Name | James V. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Sweden |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Scott-County, Iowa
Son, age 10
Scott-County, Iowa · implied b. ~1930 — 10 household members
| Surname | Carroll |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Davenport City |
| 1935 Residence (County) | Scott |
| Highest Grade | No 4 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
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 James Carroll across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
James Carroll
Son · 1940 · age 10 · b. ~1930 · Iowa
★ You are viewing this record
Sibling
Margaret Carroll
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Paul Carroll
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Gertrude Carroll
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Carroll
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Carroll
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Richard Carroll
Sibling · 1940 · age 12
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 — Scott-County, Iowa
Open full size
1940 US Federal Census — Scott-County, Iowa
Page Contents
38 people indexed on this census page (nara:1940:m-t0627-01203-00858)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Elmer D Hardell | 42 | Head | Riveter | Iowa |
| 42 | Evelyn Hardell | 44 | Wife | Cook | Iowa |
| 45 | Wesley S Batten | 46 | Head | Bus Driver | Iowa |
| 46 | Mina Batten | 39 | Wife | — | Iowa |
| 47 | Wesley Jr. Batten | 9 | Son | — | Iowa |
| 48 | Lawrence Carlson | 27 | Head | Moulder | Iowa |
| 49 | Adeline Carlson | 22 | Wife | — | Iowa |
| 50 | Richard Carlson | 2 | Son | — | Iowa |
| 51 | Betty Carlson | 0 | Daughter | — | Iowa |
| 52 | Fritz Schlemmer | 35 | Boarder | Moulder | Iowa |
| 53 | Robert H Carroll | 56 | Head | Laborer | Iowa |
| 54 | Linnea Carroll | 53 | Wife | — | Sweden |
| 55 | Gertrude Carroll | 24 | Daughter | Stenographer | Iowa |
| 56 | John Carroll | 21 | Son | Bookkeeper | Iowa |
| 57 | Paul Carroll | 20 | Son | Office Boy | Iowa |
| 58 | Margaret Carroll | 19 | Daughter | — | Iowa |
| 59 | Mary Anne Carroll | 15 | Daughter | — | Iowa |
| 60 | Richard Carroll | 12 | Son | — | Iowa |
| 61 | James Carroll THIS PERSON | 10 | Son | — | Iowa |
| 62 | Charles A Berg | 81 | Father-in-law | — | Sweden |
| 63 | Anne Q Vance | 52 | Head | Clerical | Wisconsin |
| 64 | Kathryn Donnelly | 54 | Roomer | Housework | Iowa |
| 65 | George M Nelson | 33 | Head | Manager | Missouri |
| 66 | Katherine Nelson | 27 | Wife | — | Iowa |
| 67 | Ronald W Nelson | 1 | Son | — | Iowa |
| 68 | James H Murphy | 71 | Head | — | Illinois |
| 69 | Bridget Murphy | 63 | Wife | — | Iowa |
| 70 | James Jr. Murphy | 38 | Son | Switchman | Illinois |
| 71 | Paul Murphy | 31 | Son | Welder | Iowa |
| 72 | George Glanz | 76 | Head | Saw Filer | Illinois |
| 73 | Mary Glanz | 72 | Wife | — | Iowa |
| 74 | Lyal Glanz | 37 | Son | Barber | Iowa |
| 75 | Clymer Klitzke | 30 | Son-in-law | Salesman | Minnesota |
| 76 | Winifred Klitzke | 34 | Daughter | — | Iowa |
| 77 | Robert Klitzke | 4 | Grandson | — | Illinois |
| 78 | Lou Antoniotti | 55 | Head | Chef | Italy |
| 79 | Quinta Antoniotti | 53 | Wife | — | Italy |
| 80 | Mary Antoniotti | 17 | Daughter | — | Iowa |
Related Census Records
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)