JC
James Carroll — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Bremer-County, Iowa
Our Model Tree links this James Carroll across the 1930 and 1940 US Censuses in Bremer-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 | Bremer-County, Iowa |
| Surname | Carroll |
| Given Name | James L. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Frederika Town |
| 1935 Residence (County) | Bremer |
| Additional Details | |
| Highest Grade | 7 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Frederika Town |
| 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 | — | 16 | ~1924 |
| Jane Carroll | Daughter | — | 11 | ~1929 |
| Claus Carroll | Head | — | 49 | ~1891 |
| Elmer Carroll | Other | — | 47 | ~1893 |
| Richard Carroll | Son | — | 18 | ~1922 |
| James Carroll | Son | — | 10 | ~1930 |
| Robert Carroll | Son | — | 21 | ~1919 |
| Junior Carroll | Son | — | 19 | ~1921 |
| Phillip Carroll | Son | — | 13 | ~1927 |
| Amelia Carroll | Spouse | — | 47 | ~1893 |
Census Appearances
1930
Bremer, Iowa
Son, age 2
Bremer, Iowa · implied b. ~1928 — 12 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Carroll |
| Given Name | James R |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Occupation | none |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Bremer-County, Iowa
Son, age 10
Bremer-County, Iowa · implied b. ~1930 — 10 household members
| Surname | Carroll |
| Given Name | James L. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Frederika Town |
| 1935 Residence (County) | Bremer |
| Highest Grade | 7 |
| 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
Jane Carroll
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Carroll
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Phillip Carroll
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Richard Carroll
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Junior Carroll
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Carroll
Sibling · 1940 · age 16
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 — Bremer-County, Iowa
Open full size
1940 US Federal Census — Bremer-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01142-00068)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Arthur Rundell | 48 | Head | Laborer | Iowa |
| 42 | Elston Rundell | 20 | Son | Laborer | Iowa |
| 43 | Marcella Rundell | 18 | Daughter | — | Iowa |
| 44 | Ruth Rundell | 16 | Daughter | — | Iowa |
| 45 | Arlene Rundell | 10 | Daughter | — | Iowa |
| 46 | Clarence Freitag | 34 | Head | Operator | Iowa |
| 47 | Josephine V. Freitag | 29 | Wife | — | Iowa |
| 48 | Henry Hummelshne | 64 | Head | — | Iowa |
| 49 | Emma Hummelshne | 59 | Wife | — | Iowa |
| 50 | Clark J. Tibbetts | 78 | Head | — | Illinois |
| 51 | Mary A. Tibbetts | 71 | Wife | — | Illinois |
| 52 | Adela Rundell | 40 | Head | — | Iowa |
| 53 | Harry F. Peters | 43 | Head | Laborer | Missouri |
| 54 | Iena Peters | 34 | Wife | — | Virginia |
| 55 | Helen F. Peters | 12 | Daughter | — | Iowa |
| 56 | Carol R. Peters | 10 | Daughter | — | Iowa |
| 57 | Melvin H. Peters | 8 | Son | — | Iowa |
| 58 | Jerry D. Peters | 5 | Son | — | Iowa |
| 59 | Bertha Mooney | 52 | Head | — | Iowa |
| 60 | Leon B. Gralty | 42 | Head | Creamery Operator | Iowa |
| 61 | Elsie S. Gralty | 43 | Wife | — | Iowa |
| 62 | Harlan O. Gralty | 13 | Son | — | Iowa |
| 63 | Cyril T. Bowers | 43 | Head | Postmaster | Iowa |
| 64 | Hazel M. Bowers | 40 | Wife | — | Iowa |
| 65 | Lyle F. Bowers | 17 | Son | — | Iowa |
| 66 | Claus E. Carroll | 49 | Head | Moving Contractor | Iowa |
| 67 | Amelia Carroll | 47 | Wife | — | Iowa |
| 68 | Robert E. Carroll | 21 | Son | Laborer | Iowa |
| 69 | Junior C. Carroll | 19 | Son | Laborer | Iowa |
| 70 | Richard C. Carroll | 18 | Son | Farm Hand | Iowa |
| 71 | Mary Jean Carroll | 16 | Daughter | — | Iowa |
| 72 | Phillip C. Carroll | 13 | Son | — | Iowa |
| 73 | James L. Carroll THIS PERSON | 10 | Son | — | Iowa |
| 74 | Jane K. Carroll | 11 | Daughter | — | Iowa |
| 75 | Elmer F. Carroll | 47 | Brother | Laborer | Iowa |
| 76 | Charles C. Jahnke | 86 | Head | — | Germany |
| 77 | Mary Jahnke | 79 | Wife | — | Germany |
| 78 | Clint J. Sheriff | 59 | Head | Garage | Iowa |
| 79 | Mary Sheriff | 58 | Wife | — | Iowa |
| 80 | Kate Schumacher | 66 | Sister-in-law | — | 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)