MS
Mary Schmitt — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Black-Hawk-County, Iowa
Our Model Tree links this Mary Schmitt across the 1930 and 1940 US Censuses in Black-Hawk-County, Iowa (XGBoost, ~Confirmed) — first a daughter (b.~1923), then head of a 6-person household.
Age 17
b. ~1923
Female
Daughter
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Black-Hawk-County, Iowa |
| Surname | Schmitt |
| Given Name | Mary M. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Waterloo City |
| 1935 Residence (County) | Black Hawk |
| Additional Details | |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Waterloo City |
| Est. Birth Year | ~1923 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Dolores Schmitt | Spouse | — | 38 | ~1902 |
| Ralph Schmitt | Head | — | 39 | ~1901 |
| Richard Schmitt | Son | — | 8 | ~1932 |
| James Schmitt | Son | — | 11 | ~1929 |
| Mary Schmitt | Daughter | — | 17 | ~1923 |
| Betty Schmitt | Daughter | — | 15 | ~1925 |
Census Appearances
1930
Black Hawk, …
Daughter, age 7
Black Hawk, Iowa · implied b. ~1923 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Schmitt |
| Given Name | Mary M. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Black-Hawk-County, Iowa
Daughter, age 17
Black-Hawk-County, Iowa · implied b. ~1923 — 6 household members
| Surname | Schmitt |
| Given Name | Mary M. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Waterloo City |
| 1935 Residence (County) | Black Hawk |
| 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 Schmitt across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Schmitt
Daughter · 1940 · age 17 · b. ~1923 · Iowa
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Sibling
Richard Schmitt
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Schmitt
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Betty Schmitt
Sibling · 1940 · age 15
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 — Black-Hawk-County, Iowa
Open full size
1940 US Federal Census — Black-Hawk-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01140-01018)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Helen Kelley | 19 | Daughter | Housewife | Iowa |
| 42 | Jo Anne Kelley | 3 | Granddaughter | — | — |
| 43 | George A. Clark | 44 | Head | Brakeman | Iowa |
| 44 | Neva Clark | 44 | Wife | Housewife | Iowa |
| 45 | Richard Clark | 16 | Son | — | Iowa |
| 46 | Raymond Clark | 12 | Son | — | Iowa |
| 47 | Victor Wood | 31 | Head | Meat Cutter | Idaho |
| 48 | Florence Wood | 28 | Wife | Housewife | Iowa |
| 49 | Lowell Wood | 12 | Son | Same Place | — |
| 50 | James Rife | 51 | Head | Moulder | Pennsylvania |
| 51 | Rose M. Rife | 57 | Wife | Housewife | Iowa |
| 52 | Margaret Shushet | 32 | Niece | Laundress | Iowa |
| 53 | Herbert Kingsley | 27 | Head | Machinist | Iowa |
| 54 | Donna Kingsley | 26 | Wife | Housewife | Iowa |
| 55 | Vonnie Kingsley | 5 | Daughter | — | — |
| 56 | June Kingsley | 1 | Daughter | — | — |
| 57 | Ralph Schmitt | 39 | Head | Driver | Iowa |
| 58 | Dolores Schmitt | 38 | Wife | Housewife | Iowa |
| 59 | Mary M. Schmitt THIS PERSON | 17 | Daughter | — | Iowa |
| 60 | Betty J. Schmitt | 15 | Daughter | — | Iowa |
| 61 | James E. Schmitt | 11 | Son | — | Iowa |
| 62 | Richard R. Schmitt | 8 | Son | — | Iowa |
| 63 | Fred Holdiman | 37 | Head | Brakeman | Iowa |
| 64 | Elizabeth Holdiman | 40 | Wife | — | Iowa |
| 65 | Iris Holdiman | 12 | Daughter | — | Iowa |
| 66 | Mary Clancy | 19 | Maid | Maid | Iowa |
| 67 | Edith Hilder | 49 | Lodger | Waitress | Iowa |
| 68 | James Van Eaton | 32 | Head | Machinist | Iowa |
| 69 | Marguerite Van Eaton | 30 | Wife | Housewife | Iowa |
| 70 | Jean Van Eaton | 11 | Daughter | — | Iowa |
| 71 | Jane Van Eaton | 12 | Daughter | — | Iowa |
| 72 | Donald Van Eaton | 9 | Son | — | Iowa |
| 73 | Virginia Anderson | 19 | Niece | — | Iowa |
| 74 | Arthur Jennings | 51 | Head | Engineer | Iowa |
| 75 | Kathryn Jennings | 50 | Wife | Housewife | Iowa |
| 76 | Frances Schlueter | 31 | Roomer | Operator | Iowa |
| 77 | William Gardener | 36 | Nephew | Usher | Wisconsin |
| 78 | Ralph Billings | 27 | Head | Clerk | Iowa |
| 79 | Phyllis Billings | 26 | Wife | Housewife | Iowa |
| 80 | Wayne Billings | 4 | Son | — | — |
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)