MC
Mary Carroll — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cerro-Gordo-County, Iowa
Our Model Tree links this Mary Carroll across the 1920, 1930 and 1940 US Censuses in Cerro-Gordo-County, Iowa (XGBoost, ~Confirmed) — first a head (b.~1864), then head of a 5-person household.
Age 76
b. ~1864
Female
Head
Born: Iowa
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Cerro-Gordo-County, Iowa |
| Surname | Carroll |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 76 |
| Marital Status | Widowed |
| Birthplace | Iowa |
| 1935 Residence (City) | Bath Twp |
| 1935 Residence (County) | Cerro Gordo |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Bath Twp |
| Est. Birth Year | ~1864 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Carroll | Head | — | 76 | ~1864 |
| Helen French | Other | — | 20 | ~1920 |
| John Carroll | Son | — | 36 | ~1904 |
| James Carroll | Son | — | 50 | ~1890 |
| William Carroll | Son | — | 47 | ~1893 |
Census Appearances
1920
Cerro Gordo, …
Spouse, age 56
Cerro Gordo, Iowa · implied b. ~1864 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Carroll |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 56 |
| Marital Status | Married |
| Birthplace | Iowa |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Cerro Gordo, …
Other, age 66
Cerro Gordo, Iowa · implied b. ~1864 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Carroll |
| Given Name | Mary |
| Sex | F |
| Color / Race | White |
| Age | 66 |
| Marital Status | Married |
| Birthplace | Iowa |
| Age at First Marriage | 21 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Cerro-Gordo-County, Iowa
Head, age 76
Cerro-Gordo-County, Iowa · implied b. ~1864 — 5 household members
| Surname | Carroll |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 76 |
| Marital Status | Widowed |
| Birthplace | Iowa |
| 1935 Residence (City) | Bath Twp |
| 1935 Residence (County) | Cerro Gordo |
| Income (1939) | 0 |
| Highest Grade | 8 |
| 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 Mary Carroll across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Carroll
Head · 1940 · age 76 · b. ~1864 · Iowa
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Cerro-Gordo-County, Iowa
Open full size
1940 US Federal Census — Cerro-Gordo-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01146-00016)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Marton Johnson | 60 | Head | Farmer | Norway |
| 42 | Amanda Johnson | 52 | Wife | — | Wisconsin |
| 43 | George Johnson | 24 | Son | Farm Laborer | Iowa |
| 44 | Floyd Johnson | 23 | Son | Farm Laborer | Iowa |
| 45 | Clarence Johnson | 21 | Son | Drain Tile Layer | Iowa |
| 46 | Dorothy Johnson | 16 | Daughter | — | Iowa |
| 47 | Mell Bergan | 56 | Head | Farmer | Belgium |
| 48 | Louise Verhelst | 70 | Sister | — | Belgium |
| 49 | Alfred Hansen | 32 | Head | Farmer | Iowa |
| 50 | Margaret Hansen | 30 | Wife | — | Illinois |
| 51 | Phyllis Hansen | 10 | Daughter | — | Iowa |
| 52 | Shirley Hansen | 8 | Daughter | — | Iowa |
| 53 | Jimmy Hansen | 6 | Son | — | Iowa |
| 54 | Marilyn Hansen | 2 | Daughter | — | Iowa |
| 55 | Mary Carroll THIS PERSON | 76 | Head | — | Iowa |
| 56 | James D. Carroll | 50 | Son | Farmer | Iowa |
| 57 | William Carroll | 47 | Son | Farmer | Iowa |
| 58 | John Carroll | 36 | Son | Farmer | Iowa |
| 59 | Helen French | 20 | Hired girl | Housework | Iowa |
| 60 | Clifford Rasmus | 27 | Head | Farmer | Iowa |
| 61 | Ada Rasmus | 25 | Wife | — | Iowa |
| 62 | Coleen Rasmus | 3 | Daughter | — | Iowa |
| 63 | David Rasmus | 1 | Son | — | Iowa |
| 64 | George Butcher | 67 | Head | Farm Operator | England |
| 65 | Alice Butcher | 33 | Daughter | — | Iowa |
| 66 | Florence Butcher | 28 | Daughter | — | Iowa |
| 67 | Arthur Butcher | 22 | Son | Farmer | Iowa |
| 68 | Floyd Butcher | 7 | Grandson | — | Iowa |
| 69 | Richard Butcher | 45 | Son | Farm Laborer | Iowa |
| 70 | Emil J. Broers | 34 | Head | Farmer | Iowa |
| 71 | Cecil Broers | 33 | Wife | — | Illinois |
| 72 | Billie Broers | 4 | Son | — | Iowa |
| 73 | Eva M. Broers | 2 | Daughter | — | Iowa |
| 74 | Richard Hill | 19 | Hired boy | Farm Laborer | Iowa |
| 75 | David D. Brown | 64 | Head | Farmer | Iowa |
| 76 | Anna M. Brown | 64 | Wife | — | Iowa |
| 77 | Delbert Brown | 37 | Son | Farmer | Iowa |
| 78 | Evaline Brown | 21 | Daughter in law | — | Iowa |
| 79 | Jack Woodley | 27 | Hired boy | Farm Laborer | Iowa |
| 80 | Art Schold | 47 | Head | Grader | 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)