RC
Ralph Clark — 1940 US Census Record
Model Tree available1940 United States Federal Census · Boone-County, Iowa
Our Model Tree links this Ralph Clark across the 1920, 1930 and 1940 US Censuses in Boone-County, Iowa (XGBoost, ~Confirmed), with identified parents Hiram & Elizabeth — first a head (b.~1897), then head of a 8-person household.
Age 43
b. ~1897
Male
Head
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Boone-County, Iowa |
| Surname | Clark |
| Given Name | Ralph |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 43 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Boone |
| Additional Details | |
| Occupation | Disabled Veteran |
| Hours Worked | 0 |
| Income (1939) | 45 |
| Highest Grade | No 8 |
| 1935 Residence | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Disabled Veteran |
| Township / Ward | Yell |
| Est. Birth Year | ~1897 |
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 Ralph | Age | Birth yr |
|---|---|---|---|---|
| Donna Clark | Daughter | — | 4 | ~1936 |
| James Clark | Son | — | 8 | ~1932 |
| Mary Clark | Daughter | — | 12 | ~1928 |
| Naoma Clark | Daughter | — | 13 | ~1927 |
| Denise Clark | Daughter | — | ~1940 | |
| Mary Clark | Other | — | 83 | ~1857 |
| Ruth Clark | Spouse | — | 29 | ~1911 |
| Ralph Clark | Head | — | 43 | ~1897 |
Census Appearances
1920
Boone, Iowa
Son, age 23
Boone, Iowa · implied b. ~1897 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | Ralph |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Wisconsin |
| Occupation | Farm Laborer |
| Industry | Working out |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Boone, Iowa
Son, age 33
Boone, Iowa · implied b. ~1897 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | Ralph |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 33 |
| Marital Status | Married |
| Birthplace | Iowa |
| Age at First Marriage | 29 |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Wisconsin |
| Occupation | Laborer |
| Industry | Odd jobs |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Boone-County, Iowa
Head, age 43
Boone-County, Iowa · implied b. ~1897 — 8 household members
| Surname | Clark |
| Given Name | Ralph |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 43 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Boone |
| Occupation | Disabled Veteran |
| Hours Worked | 0 |
| Income (1939) | 45 |
| Highest Grade | No 8 |
| 1935 Residence | Iowa |
| 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 Ralph Clark across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Hiram Clark (~0.92 confidence) and mother Elizabeth Clark (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Hiram Clark
b. ~1864
Source father
● Household
· direct · ~0.92
Mother
Elizabeth Clark
b. ~1869
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Ralph Clark
Head · 1940 · age 43 · b. ~1897 · Iowa
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Boone-County, Iowa
Open full size
1940 US Federal Census — Boone-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01141-00896)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Gladys Kristiansen | 21 | Wife | — | Iowa |
| 42 | Bryant Neal Kristiansen | 1 | Son | — | Iowa |
| 43 | Troy Kristiansen | 29 | Head | Farming | South Dakota |
| 44 | Betty Q. Kristiansen | 22 | Wife | — | Iowa |
| 45 | Ralph Clark THIS PERSON | 43 | Head | Disabled Veteran | Iowa |
| 46 | Ruth O. Clark | 29 | Wife | — | Iowa |
| 47 | Naoma Clark | 13 | Daughter | — | Iowa |
| 48 | Mary Clark | 12 | Daughter | — | Iowa |
| 49 | James Clark | 8 | Son | — | Iowa |
| 50 | Donna Lorraine Clark | 4 | Daughter | — | Iowa |
| 51 | Denise C. Clark | 0 | Daughter | — | Iowa |
| 52 | Mary E. Clark | 83 | Mother | — | Wisconsin |
| 53 | S. S. Cadwell | 48 | Head | Farming | Iowa |
| 54 | Vivian Cadwell | 44 | Wife | — | Alabama |
| 55 | Mabry Lee Lang | 16 | Wife's daughter | Student | Alabama |
| 56 | Eli A. Craven | 70 | Head | Farming | Illinois |
| 57 | Florence Craven | 65 | Wife | — | Iowa |
| 58 | Charles Craven | 28 | Son | Farm Helper | Iowa |
| 59 | John R. Johnson | 67 | Head | Farming | Kansas |
| 60 | Mattie E. Johnson | 65 | Wife | — | Missouri |
| 61 | Earl P. Stark | 49 | Nephew | Farmer | Iowa |
| 62 | Donald R. Johnson | 25 | Head | Farming | Iowa |
| 63 | Isabel Johnson | 26 | Wife | — | Iowa |
| 64 | R. G. Whittlesey | 45 | Head | Farming | Illinois |
| 65 | Ethel A. Whittlesey | 46 | Wife | — | Missouri |
| 66 | Clinton Rab Whittlesey | 14 | Son | Student | Iowa |
| 67 | James A. Whittlesey | 9 | Son | — | Iowa |
| 68 | Fred Gilroy | 58 | Head | Farming | Nebraska |
| 69 | Julia O. Porter | 68 | Head | — | Illinois |
| 70 | Wallace Nylander | 47 | Head | Farming | Iowa |
| 71 | Mary Nylander | 36 | Wife | — | Iowa |
| 72 | Rosemary Nylander | 13 | Daughter | — | Iowa |
| 73 | Janice Dee Nylander | 4 | Daughter | — | Iowa |
| 74 | George Zunkle | 67 | Head | Farmer | Iowa |
| 75 | Beulah Zunkle | 63 | Wife | — | Iowa |
| 76 | Anton Larson | 60 | Lodger | Farm Helper | Iowa |
| 77 | Reuben Kristiansen | 40 | Head | Farming | Iowa |
| 78 | Francis Kristiansen | 25 | Wife | — | Iowa |
| 79 | Helen Kristiansen | 2 | Daughter | — | Iowa |
| 80 | Rueben Jr. Kristiansen | 1 | Son | — | Iowa |
Pedigree Summary
Ralph
Gen 1 · 2 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)