CC
Clara Clark — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Black-Hawk-County, Iowa
Our Model Tree links this Clara Clark across the 1920, 1930 and 1940 US Censuses in Black-Hawk-County, Iowa (XGBoost, ~Confirmed) — first a spouse (b.~1898), then head of a 8-person household.
Age 42
b. ~1898
Female
Spouse
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Black-Hawk-County, Iowa |
| Surname | Clark |
| Given Name | Clara A. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 42 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Waterloo City |
| 1935 Residence (County) | Black Hawk |
| Additional Details | |
| Occupation | housewife |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Housewife |
| Township / Ward | Waterloo City |
| Est. Birth Year | ~1898 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Clara | Age | Birth yr |
|---|---|---|---|---|
| Lela Clark | Daughter | — | 16 | ~1924 |
| Dorothy Clark | Daughter | — | 18 | ~1922 |
| Laune Clark | Son | — | 14 | ~1926 |
| Clara Clark | Spouse | — | 42 | ~1898 |
| William Clark | Head | — | 44 | ~1896 |
| Harry Jacobson | Other | — | 26 | ~1914 |
| Roger Clark | Son | — | 8 | ~1932 |
| James Clark | Son | — | 10 | ~1930 |
Census Appearances
1920
Black Hawk, …
Spouse, age 22
Black Hawk, Iowa · implied b. ~1898 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | Clara |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 22 |
| Marital Status | Married |
| Birthplace | Iowa |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Iowa |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Black Hawk, …
Spouse, age 32
Black Hawk, Iowa · implied b. ~1898 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | Clara |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 32 |
| Marital Status | Married |
| Birthplace | Iowa |
| Age at First Marriage | 18 |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Iowa |
| Can Read/Write | Yes |
| Home Owned/Rented | No |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Black-Hawk-County, Iowa
Spouse, age 42
Black-Hawk-County, Iowa · implied b. ~1898 — 8 household members
| Surname | Clark |
| Given Name | Clara A. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 42 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Waterloo City |
| 1935 Residence (County) | Black Hawk |
| Occupation | housewife |
| 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 Clara Clark across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Clara Clark
Spouse · 1940 · age 42 · b. ~1898 · 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-t0627-01140-01042)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Leo Gradinger | 38 | Head | Clothier | New York |
| 42 | Thelma Gradinger | 38 | Wife | Housewife | Iowa |
| 43 | Gilbert Gradinger | 9 | Son | — | Iowa |
| 44 | Elaine Gradinger | 11 | Daughter | — | Iowa |
| 45 | Al Sol | 29 | Brother | Store Keeper | New York |
| 46 | John H. Boeger | 59 | Head | Inspector | Iowa |
| 47 | Rachael A. Boeger | 54 | Wife | Housewife | Iowa |
| 48 | Alvin G. Boeger | 16 | Son | — | Iowa |
| 49 | Douglas Blackhall | 54 | Head | Sales Manager | Scotland |
| 50 | Hazel A. Blackhall | 52 | Wife | Housewife | Iowa |
| 51 | Richard Marx | 42 | Head | Molder | Germany |
| 52 | Emma A. Marx | 37 | Wife | Housewife | Iowa |
| 53 | Richard Marx | 18 | Son | — | Iowa |
| 54 | Roger Marx | 16 | Son | — | Iowa |
| 55 | Betty Marx | 15 | Daughter | — | Iowa |
| 56 | Delores Marx | 8 | Daughter | — | Iowa |
| 57 | Harold C. Kelley | 44 | Head | Stuffer | Iowa |
| 58 | Iona A. Kelley | 41 | Wife | Housewife | Iowa |
| 59 | Lyle Kelley | 12 | Son | — | Iowa |
| 60 | Arlene Kelley | 9 | Daughter | — | Iowa |
| 61 | William T. Clark | 44 | Head | Grinder | Iowa |
| 62 | Clara A. Clark THIS PERSON | 42 | Wife | Housewife | Iowa |
| 63 | Dorothy Clark | 18 | Daughter | — | Iowa |
| 64 | Lela Clark | 16 | Daughter | — | Iowa |
| 65 | Laune Clark | 14 | Son | — | Iowa |
| 66 | James Clark | 10 | Son | — | Iowa |
| 67 | Roger Clark | 8 | Son | — | Iowa |
| 68 | Harry Jacobson | 26 | Boarder | Salesman | Iowa |
| 69 | Carl Neubauer | 58 | Head | Dry Cleaner | Iowa |
| 70 | Catherine A. Neubauer | 53 | Wife | Housewife | Iowa |
| 71 | Carl Jr. Neubauer | 24 | Son | Clerk | Iowa |
| 72 | Leona Neubauer | 14 | Daughter | — | Iowa |
| 73 | Bessie Irwin | 69 | Head | House Keeper | Nebraska |
| 74 | Grace A. Irwin | 30 | Daughter | Waitress | Iowa |
| 75 | Edward A. Hansen | 53 | Head | Janitor | Denmark |
| 76 | Bernice A. Hansen | 54 | Wife | Housewife | Iowa |
| 77 | Bernard A. Lane | 30 | Head | Baker | Iowa |
| 78 | Margarette Lane | 28 | Wife | Clerk | Iowa |
| 79 | Mason Odekirk | 58 | Head | Conductor | Illinois |
| 80 | Hattie Odekirk | 58 | Wife | Housewife | 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)