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Lois Clark — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Polk-County, Iowa
Our Model Tree links this Lois Clark across the 1930 and 1940 US Censuses in Polk-County, Iowa (XGBoost, ~Confirmed) — first a daughter (b.~1924), then head of a 7-person household.
Age 16
b. ~1924
Female
Daughter
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Polk-County, Iowa |
| Surname | Clark |
| Given Name | Lois |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Des Moines City |
| 1935 Residence (County) | Polk |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | H-2 |
| 1935 Residence | Same House |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Des Moines City |
| Est. Birth Year | ~1924 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Lois | Age | Birth yr |
|---|---|---|---|---|
| James Clark | Son | — | 6 | ~1934 |
| Bonnie Clark | Daughter | — | 10 | ~1930 |
| Block Ends | Other | — | — | |
| Eugene Clark | Son | — | 13 | ~1927 |
| Herbert Clark | Head | — | 45 | ~1895 |
| Grace Clark | Spouse | — | 39 | ~1901 |
| Lois Clark | Daughter | — | 16 | ~1924 |
Census Appearances
1930
Polk, Iowa
Daughter, age 6
Polk, Iowa · implied b. ~1924 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | Lois M |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Arizona |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Polk-County, Iowa
Daughter, age 16
Polk-County, Iowa · implied b. ~1924 — 7 household members
| Surname | Clark |
| Given Name | Lois |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Des Moines City |
| 1935 Residence (County) | Polk |
| Income (1939) | 0 |
| Highest Grade | H-2 |
| 1935 Residence | Same House |
| 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 Lois Clark across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Lois Clark
Daughter · 1940 · age 16 · b. ~1924 · Iowa
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Sibling
James Clark
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eugene Clark
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Bonnie Clark
Sibling · 1940 · age 10
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 — Polk-County, Iowa
Open full size
1940 US Federal Census — Polk-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01196-01051)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Grace Bernard | 18 | Daughter | New Worker | Iowa |
| 2 | Tony Bernard | 14 | Son | New Worker | Iowa |
| 3 | Victoria Bernard | 14 | Daughter | — | Iowa |
| 4 | John Bernard | 13 | Son | — | Iowa |
| 5 | Lawrence Gustafson | 43 | Head | Toy Maker | Iowa |
| 6 | Gladys Gustafson | 39 | Wife | — | Iowa |
| 7 | John Mckinney | 42 | Head | Salesman | Iowa |
| 8 | Lena Mckinney | 31 | Wife | — | Minnesota |
| 9 | Harold Speith | 57 | Head | Labor | Germany |
| 10 | Cora Speith | 56 | Wife | — | Illinois |
| 11 | Herbert Clark | 45 | Head | Electrician | Iowa |
| 12 | Grace Clark | 39 | Wife | — | Arizona |
| 13 | Lois Clark THIS PERSON | 16 | Daughter | — | Iowa |
| 14 | Eugene Clark | 13 | Son | — | Iowa |
| 15 | Bonnie Clark | 10 | Daughter | — | Iowa |
| 16 | James Clark | 6 | Son | — | Iowa |
| 17 | Block Ends | None | — | — | — |
| 18 | Frank Gale | 70 | Head | Upholstering | Iowa |
| 19 | Clara Gale | 67 | Wife | — | Iowa |
| 20 | Block Ends | None | — | — | — |
| 21 | Harvey Kierulff | 45 | Head | Pharmacist | Iowa |
| 22 | Helen Kierulff | 36 | Wife | Clerk | Iowa |
| 23 | Edward Kierulff | 14 | Son | — | Iowa |
| 24 | Johnnie Kierulff | 12 | Son | — | Iowa |
| 25 | Joan Kierulff | 10 | Daughter | — | Iowa |
| 26 | Marilyn Kierulff | 8 | Daughter | — | Iowa |
| 27 | Mary Jane Kierulff | 2 | Daughter | — | Iowa |
| 28 | Franklin Edmond | 57 | Head | Labor | New Hampshire |
| 29 | Alta Edmond | 51 | Wife | — | Iowa |
| 30 | Lawrence Deyoung | 60 | Head | Hardware | Iowa |
| 31 | Rilla Deyoung | 56 | Wife | — | Iowa |
| 32 | Hanna Beck | 65 | Wife | — | Sweden |
| 33 | Grover Beck | 24 | Son | Miner | Iowa |
| 34 | Robert Beck | 20 | Son | Labor | Iowa |
| 35 | Walter Beck | 16 | Son | — | Iowa |
| 36 | Ruby Grayson | 27 | Lodger | Beauty Parlor | Iowa |
| 37 | Charles Fisher | 53 | Head | Maintenance | Iowa |
| 38 | Anna Fisher | 54 | Wife | Teacher | Iowa |
| 39 | Ethel Gibbons | 50 | Sister | Secretary | Iowa |
| 40 | Miller Young | 59 | Head | Book Keeper | 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)