MS
Mary Schmidt — 1940 US Census Record
Model Tree available1940 United States Federal Census · Sioux-County, Iowa
Our Model Tree links this Mary Schmidt across the 1920, 1930 and 1940 US Censuses in Sioux-County, Iowa (XGBoost, ~Confirmed), with identified parents George & George — first a daughter (b.~1909), then head of a 4-person household.
Age 31
b. ~1909
Female
Daughter
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Sioux-County, Iowa |
| Surname | Schmidt |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Dionville |
| 1935 Residence (County) | Sioux |
| Additional Details | |
| Occupation | Maid |
| Industry | Private |
| Class of Worker | PW |
| Income (1939) | 100 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Maid |
| Township / Ward | Dionville |
| Est. Birth Year | ~1909 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Rose Schmidt | Daughter | — | 23 | ~1917 |
| Mary Schmidt | Daughter | — | 31 | ~1909 |
| Leo Schmidt | Son | — | 28 | ~1912 |
| Margaret Schmidt | Spouse | — | 66 | ~1874 |
Census Appearances
1920
Sioux, Iowa
Daughter, age 10
Sioux, Iowa · implied b. ~1910 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Schmidt |
| Given Name | Mary A. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Austria |
| Mother's Birthplace | Iowa |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Sioux, Iowa
Daughter, age 21
Sioux, Iowa · implied b. ~1909 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Schmidt |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Austria |
| Mother's Birthplace | Iowa |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Sioux-County, Iowa
Daughter, age 31
Sioux-County, Iowa · implied b. ~1909 — 4 household members
| Surname | Schmidt |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Dionville |
| 1935 Residence (County) | Sioux |
| Occupation | Maid |
| Industry | Private |
| Class of Worker | PW |
| Income (1939) | 100 |
| Highest Grade | H 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 Mary Schmidt across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father George Schmidt (~0.92 confidence) and father George Schmidt (~0.92 confidence) and mother Margaret Schmidt (~0.92 confidence) and mother Maggie Schmidt (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
George Schmidt
b. ~1868
Source father
● Household
· direct · ~0.92
Father
George Schmidt
b. ~1870
Source father
● Household
· direct · ~0.92
Mother
Margaret Schmidt
b. ~1874
Source mother
● Household
· direct · ~0.92
Mother
Maggie Schmidt
b. ~1875
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Schmidt
Daughter · 1940 · age 31 · b. ~1909 · Iowa
★ You are viewing this record
Sibling
Rose Schmidt
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Leo Schmidt
Sibling · 1940 · age 28
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 — Sioux-County, Iowa
Open full size
1940 US Federal Census — Sioux-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01205-00150)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Margaret Schmidt | 66 | Wife | — | Iowa |
| 42 | Mary Schmidt THIS PERSON | 31 | Daughter | Maid | Iowa |
| 43 | Leo Schmidt | 28 | Son | Repair Man | Iowa |
| 44 | Rose Schmidt | 23 | Daughter | Clerk | Iowa |
| 45 | Anna Thompson | 58 | Head | Dressmaking | Iowa |
| 46 | F. B. Schutz | 68 | Head | Salesman | Belgium |
| 47 | Marie Schutz | 52 | Wife | — | Illinois |
| 48 | Kathleen Schutz | 21 | Daughter | Teacher | Iowa |
| 49 | John Kohlenge | 56 | Head | Chauffeur | Iowa |
| 50 | Antonette Kohlenge | 57 | Wife | — | Iowa |
| 51 | Bert S. Schauer | 81 | Head | — | Germany |
| 52 | Louisa Schauer | 74 | Wife | — | Germany |
| 53 | End Block | None | — | — | — |
| 54 | H. J. Diederick | 59 | Head | Manager Telephone | Iowa |
| 55 | Genevieve Diederick | 34 | Wife | — | Iowa |
| 56 | Bernadine Lechtenberg | 74 | Head | — | Iowa |
| 57 | Al. Overman | 46 | Head | Mechanic | Iowa |
| 58 | Grace Overman | 38 | Wife | — | Iowa |
| 59 | Anna Marie Overman | 18 | Daughter | Maid | Iowa |
| 60 | Lavonne Overman | 16 | Daughter | Waitress | Iowa |
| 61 | Verlene Overman | 15 | Daughter | — | Iowa |
| 62 | Audrey Overman | 12 | Daughter | — | Iowa |
| 63 | Raymond J. Mick | 42 | Head | Electrician | Iowa |
| 64 | Corel Mick | 37 | Wife | — | Iowa |
| 65 | Dennis Mick | 13 | Son | — | Iowa |
| 66 | Carol Mick | 11 | Daughter | — | Iowa |
| 67 | Mary Jean Mick | 9 | Daughter | — | Iowa |
| 68 | William Mick | 7 | Son | — | Iowa |
| 69 | Richard Mick | 6 | Son | — | Iowa |
| 70 | Dorothy Jean Mick | 4 | Daughter | — | Iowa |
| 71 | Mary Mick | 77 | Mother | — | Iowa |
| 72 | Mary Schlickte | 70 | Head | — | Iowa |
| 73 | William Nickel | 74 | Head | — | Germany |
| 74 | Anna Nickel | 69 | Wife | — | Germany |
| 75 | George Borman | 42 | Head | Garage Man | Iowa |
| 76 | Rose Borman | 41 | Wife | — | Iowa |
| 77 | Ed. W. Luken | 51 | Head | Manager Lumber Co. | Iowa |
| 78 | Elizabeth Luken | 47 | Wife | — | Iowa |
| 79 | Lloyd Luken | 22 | Son | Asst. Manager | Iowa |
| 80 | Doris Ab Luken | 18 | Daughter | — | Iowa |
Pedigree Summary
Mary + 2 siblings
Gen 1 · 4 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)