MF
Mary Fitzgerald — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Sioux-County, Iowa
Our Model Tree links this Mary Fitzgerald across the 1920, 1930 and 1940 US Censuses in Sioux-County, Iowa (XGBoost, ~Confirmed) — first a head (b.~1866), then head of a 2-person household.
Age 74
b. ~1866
Female
Head
Born: Illinois
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Sioux-County, Iowa |
| Surname | Fitzgerald |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 74 |
| Marital Status | Widowed |
| Birthplace | Illinois |
| 1935 Residence (City) | Rock Valley |
| 1935 Residence (County) | Sioux |
| Additional Details | |
| Highest Grade | S 8 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Rock Valley |
| Est. Birth Year | ~1866 |
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.
2 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Fitzgerald | Head | — | 74 | ~1866 |
| John Fitzgerald | Son | — | 54 | ~1886 |
Census Appearances
1920
Sioux, Iowa
Other, age 54
Sioux, Iowa · implied b. ~1866 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Fitzgerald |
| Given Name | Mary |
| Relationship to Head | Sister |
| Sex | F |
| Color / Race | White |
| Age | 54 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Sioux, Iowa
Other, age 64
Sioux, Iowa · implied b. ~1866 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Fitzgerald |
| Given Name | Mary E |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 64 |
| Marital Status | Married |
| Birthplace | Illinois |
| Age at First Marriage | 64 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Sioux-County, Iowa
Head, age 74
Sioux-County, Iowa · implied b. ~1866 — 2 household members
| Surname | Fitzgerald |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 74 |
| Marital Status | Widowed |
| Birthplace | Illinois |
| 1935 Residence (City) | Rock Valley |
| 1935 Residence (County) | Sioux |
| Highest Grade | S 8 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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 Fitzgerald across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Fitzgerald
Head · 1940 · age 74 · b. ~1866 · 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 — Sioux-County, Iowa
Open full size
1940 US Federal Census — Sioux-County, Iowa
Page Contents
38 people indexed on this census page (nara:1940:m-t0627-01205-00561)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Junior John Petersen | 12 | Son | — | Iowa |
| 42 | Marian Petersen | 8 | Daughter | — | Iowa |
| 43 | William F. Bakker | 59 | Head | Tinner | Iowa |
| 44 | Eleanora Bakker | 55 | Wife | — | Iowa |
| 45 | Evelyn Bakker | 19 | Daughter | — | Iowa |
| 46 | Robert Bakker | 12 | Son | — | Iowa |
| 47 | Albert A. Vanden Berg | 38 | Head | Carpenter | Iowa |
| 48 | Catherine Vanden Berg | 38 | Wife | — | Iowa |
| 49 | Helen Rae Vanden Berg | 11 | Daughter | — | Iowa |
| 50 | Antoinette Vanden Berg | 4 | Daughter | — | Iowa |
| 51 | Paul Robert Vanden Berg | 0 | Son | — | Iowa |
| 52 | William Scanlan | 54 | Head | Laborer | Illinois |
| 53 | Dolores Steck | 58 | Lodger | Shopkeeper | Holland |
| 54 | Lawrence Henningfield | 49 | Head | — | Iowa |
| 55 | Adrianne Henningfield | 38 | Wife | — | Iowa |
| 56 | Rosena Henningfield | 19 | Daughter | — | Iowa |
| 57 | Philomena Henningfield | 18 | Daughter | — | Iowa |
| 58 | Jerome Henningfield | 10 | Son | — | Iowa |
| 60 | Henry Kaskie | 40 | Head | Janitor | Iowa |
| 61 | August J. Feerster | 48 | Head | Clergyman | New Jersey |
| 62 | Helen Maiers | 53 | Housekeeper | Housekeeper | Germany |
| 64 | Mary Treiner | 62 | Head | — | Wisconsin |
| 65 | Mary Murphy | 65 | Head | — | Illinois |
| 66 | Julia Richter | 57 | Head | Cook | Wisconsin |
| 67 | Raymond Berner | 28 | Head | Electric Welder | Iowa |
| 68 | Tillie Berner | 23 | Wife | — | Iowa |
| 69 | George W. Berner | 0 | Son | — | Iowa |
| 70 | Christiaan Visser | 55 | Head | Laborer | Holland |
| 71 | Grace Visser | 48 | Wife | — | Holland |
| 72 | Sam Van Hoof | 33 | Head | Owner | Iowa |
| 73 | Cora Van Hoof | 33 | Wife | Waitress | Holland |
| 74 | Lyle Van Hoof | 5 | Son | — | Iowa |
| 75 | Donna Mae Van Hoof | 4 | Daughter | — | Iowa |
| 76 | John W. Raymond | 20 | Head | Wholesale Grocery | Iowa |
| 77 | Talma Raymond | 17 | Wife | — | Iowa |
| 78 | Mary Fitzgerald THIS PERSON | 74 | Head | — | Illinois |
| 79 | John Fitzgerald | 54 | Son | Laborer | Iowa |
| 80 | Ida Hoekstra | 67 | Head | — | Holland |
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)