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Bertha Schmidt — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Black-Hawk-County, Iowa
Our Model Tree links this Bertha Schmidt across the 1920, 1930 and 1940 US Censuses in Black-Hawk-County, Iowa (XGBoost, ~Confirmed) — first a spouse (b.~1883), then head of a 3-person household.
Age 57
b. ~1883
Female
Spouse
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Black-Hawk-County, Iowa |
| Surname | Schmidt |
| Given Name | Bertha |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 57 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Waterloo city |
| 1935 Residence (County) | Black Hawk |
| Additional Details | |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Waterloo City |
| Est. Birth Year | ~1883 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Bertha | Age | Birth yr |
|---|---|---|---|---|
| Dorothy Schmidt | Daughter | — | 40 | ~1900 |
| George Schmidt | Head | — | 60 | ~1880 |
| Bertha Schmidt | Spouse | — | 57 | ~1883 |
Census Appearances
1920
Blackhawk, Iowa
Spouse, age 37
Blackhawk, Iowa · implied b. ~1883 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Schmidt |
| Given Name | Bertha |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 37 |
| Marital Status | Married |
| Birthplace | Iowa |
| Father's Birthplace | Germany |
| Mother's Birthplace | Illinois |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Black Hawk, …
Other, age 48
Black Hawk, Iowa · implied b. ~1882 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Schmidt |
| Given Name | Bertha |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 48 |
| Marital Status | Married |
| Birthplace | Iowa |
| Age at First Marriage | 18 |
| Father's Birthplace | Germany |
| Mother's Birthplace | Illinois |
| Occupation | Housework |
| Industry | Private Family |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Black-Hawk-County, Iowa
Spouse, age 57
Black-Hawk-County, Iowa · implied b. ~1883 — 3 household members
| Surname | Schmidt |
| Given Name | Bertha |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 57 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Waterloo city |
| 1935 Residence (County) | Black Hawk |
| Highest Grade | No 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 Bertha Schmidt across 3 US Census years (1920, 1930 and 1940) in 3 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Bertha Schmidt
Spouse · 1940 · age 57 · b. ~1883 · 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 — 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-t0627-01140-01307)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Lester Mccallum | 25 | son | Fresh Meat | Iowa |
| 2 | Mildred Mccallum | 23 | daughter | Waitress | Iowa |
| 3 | Phillip Sutton | 38 | head | Floorman | Iowa |
| 4 | Juanita D Sutton | 34 | wife | — | Germany |
| 5 | Curtis Sutton | 14 | son | — | Iowa |
| 6 | Betty Jane Sutton | 11 | daughter | — | Iowa |
| 7 | Loren Paul Fehr | 18 | lodger | Press Operator | Iowa |
| 8 | Kenneth Bebo | 27 | lodger | Press Operator | S. Dakota |
| 9 | Herman J Bartels | 64 | head | Machinist Helper | Wisconsin |
| 10 | Paulina Bartels | 60 | wife | — | Iowa |
| 11 | Arthur H Bartels | 35 | son | Common Labor | Iowa |
| 12 | Harry Paris | 50 | head | Confectionery | Greece |
| 13 | Velda Paris | 47 | wife | — | Germany |
| 14 | George Paris | 33 | son | Smoked Meat | Iowa |
| 15 | Billy Paris | 22 | son | Shipping | Iowa |
| 16 | Ethel Paris | 20 | daughter | Sausage | Iowa |
| 17 | Mary Paris | 19 | daughter | — | Iowa |
| 18 | Christina Paris | 16 | daughter | — | Iowa |
| 19 | Emanuel E Crowney | 50 | head | Car Clerk | Missouri |
| 20 | Ruth D Crowney | 47 | wife | — | Missouri |
| 21 | Louis Crowney | 20 | son | — | Missouri |
| 22 | Robert E Crowney | 18 | son | — | Missouri |
| 23 | Maureen Crowney | 14 | daughter | — | Missouri |
| 24 | Margaret Joan Crowney | 4 | daughter | — | Iowa |
| 25 | Henry E Shipley | 40 | head | Barber | Iowa |
| 26 | Ila Shipley | 31 | wife | — | Iowa |
| 27 | Thelma Shipley | 11 | daughter | — | Iowa |
| 28 | Darle Hathaway | 24 | lodger | Barber | Iowa |
| 29 | Beulah Hathaway | 29 | lodger | Beauty Operator | Iowa |
| 30 | Troy Jones | 33 | lodger | Chef | Illinois |
| 31 | Juanita Sermist | 21 | lodger | Photographer | Illinois |
| 32 | George Schmidt | 60 | head | Laborer | Germany |
| 33 | Bertha Schmidt THIS PERSON | 57 | wife | — | Iowa |
| 34 | Dorothy Schmidt | 40 | daughter | — | Iowa |
| 35 | Harold Theiland | 37 | head | Custodian | Iowa |
| 36 | Helen D Theiland | 36 | wife | — | Iowa |
| 37 | Albert Mishorf | 35 | head | Machinist | Iowa |
| 38 | Ruby Mishorf | 31 | wife | — | Iowa |
| 39 | Paul Frost | 36 | head | Builder Helper | Iowa |
| 40 | Naomi Frost | 36 | wife | — | Iowa |
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)