RK
Ralph King — 1940 US Census Record
Model Tree available1940 United States Federal Census · O'Brien-County, Iowa
Our Model Tree links this Ralph King across the 1920, 1930 and 1940 US Censuses in O'Brien-County, Iowa (XGBoost, ~Confirmed), with identified parents Steward — first a son (b.~1890), then head of a 4-person household.
Age 50
b. ~1890
Male
Son
Born: South Dakota
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | O'Brien-County, Iowa |
| Surname | King |
| Given Name | Ralph |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 50 |
| Marital Status | Single |
| Birthplace | South Dakota |
| 1935 Residence (City) | Primghar town |
| 1935 Residence (County) | O'Brien |
| Additional Details | |
| Occupation | Laborer |
| Industry | Farm |
| Class of Worker | PW |
| Hours Worked | 3 |
| Income (1939) | 12 |
| Highest Grade | 5 |
| 1935 Residence | Same Place |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
| Occupation | Laborer |
| Township / Ward | Primghar Town |
| Est. Birth Year | ~1890 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Ralph | Age | Birth yr |
|---|---|---|---|---|
| Ralph King | Son | — | 50 | ~1890 |
| Steward King | Head | — | 85 | ~1855 |
| Le Groot | Other | — | 27 | ~1913 |
| Goldie Groot | Daughter | — | 55 | ~1885 |
Census Appearances
1920
O Brien, …
Son, age 29
O Brien, Iowa · implied b. ~1891 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | King |
| Given Name | Ralph G. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Single |
| Birthplace | South Dakota |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Iowa |
| Occupation | Teamster |
| Industry | General Farm |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
1930
O Brien, …
Son, age 40
O Brien, Iowa · implied b. ~1890 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | King |
| Given Name | Ralph |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 40 |
| Marital Status | Single |
| Birthplace | South Dakota |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Iowa |
| Occupation | Laborer |
| Industry | odd jobs |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
1940
O'Brien-County, Iowa
Son, age 50
O'Brien-County, Iowa · implied b. ~1890 — 4 household members
| Surname | King |
| Given Name | Ralph |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 50 |
| Marital Status | Single |
| Birthplace | South Dakota |
| 1935 Residence (City) | Primghar town |
| 1935 Residence (County) | O'Brien |
| Occupation | Laborer |
| Industry | Farm |
| Class of Worker | PW |
| Hours Worked | 3 |
| Income (1939) | 12 |
| Highest Grade | 5 |
| 1935 Residence | Same Place |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
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 King across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Steward King (~0.92 confidence). The pedigree spans 1 generation with 1 identified ancestor.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Steward King
b. ~1855
Source father
● Household
· direct · ~0.92
This person
Anchor record
Ralph King
Son · 1940 · age 50 · b. ~1890 · Iowa
★ You are viewing this record
Sibling
Goldie Groot
Sibling · 1940 · age 55
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 — O'Brien-County, Iowa
Open full size
1940 US Federal Census — O'Brien-County, Iowa
Page Contents
38 people indexed on this census page (nara:1940:m-t0627-01187-00213)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Steward King | 85 | Head | Truck Gardening | Ohio |
| 2 | Ralph King THIS PERSON | 50 | Son | Laborer | South Dakota |
| 3 | Goldie Groot | 55 | Daughter | Housework | South Dakota |
| 4 | Le Roy Groot | 27 | Grandson | Laborer | Iowa |
| 5 | Lois D. Bonath | 45 | Head | Cook | Illinois |
| 6 | Arthur Bonath | 20 | Son | Playground Supervisor | Iowa |
| 7 | Irene Bonath | 18 | Daughter | Waitress | Iowa |
| 8 | Robert Bonath | 12 | Son | — | Iowa |
| 9 | Harold Bonath | 7 | Son | — | Iowa |
| 10 | Earl Stewart | 58 | Head | Carpenter | Iowa |
| 11 | Vera Stewart | 54 | Wife | — | South Dakota |
| 12 | Calvin Stewart | 14 | Son | Paper Route | Iowa |
| 13 | Elizabeth Stewart | 12 | Daughter | — | Iowa |
| 14 | Velma Stewart | 8 | Daughter | — | Iowa |
| 15 | Albert Stewart | 6 | Son | — | Iowa |
| 16 | Geraldine Stewart | 4 | Daughter | — | Iowa |
| 17 | Lucy J. Hoyle | 71 | Head | — | Massachusetts |
| 18 | Nellie Hoyle | 49 | Daughter | — | Iowa |
| 19 | Hubert H. Schultz | 26 | Head | County Attorney | Iowa |
| 20 | Mary Ann Schultz | 30 | Wife | — | Iowa |
| 21 | Suzanne Schultz | 2 | Daughter | — | Iowa |
| 22 | J. A. King | 79 | Head | — | Ohio |
| 23 | Ada King | 49 | Wife | — | England |
| 24 | A. B. Roe | 42 | Head | Proprietor | Iowa |
| 25 | Ida Roe | 42 | Wife | Cook | Iowa |
| 26 | Arthur Jr. Roe | 10 | Son | — | Iowa |
| 27 | Jerome A. Lake | 73 | Head | — | Illinois |
| 28 | Mary J. Lake | 66 | Wife | — | Illinois |
| 29 | Henrietta Randolph | 80 | Head | — | Iowa |
| 30 | Eula Hill | 23 | Lodger | Teacher | Iowa |
| 31 | Franklin Baker | 84 | Head | Mail Carrier | Iowa |
| 32 | Miet. Crossey | 52 | Head | Bridge Foreman | Iowa |
| 33 | Hilda Crossey | 35 | Wife | — | Iowa |
| 34 | Bernice Crossey | 10 | Daughter | — | Iowa |
| 35 | Samuel Crossey | 8 | Son | — | Iowa |
| 36 | Ruth Crossey | 5 | Daughter | — | Iowa |
| 37 | A. H. Warntjes | 68 | Head | Manager | Holland |
| 38 | Eva O. Warntjes | 62 | Wife | — | Illinois |
Pedigree Summary
Ralph + 1 sibling
Gen 1 · 1 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)