RJ
Ralph Johnson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Delaware-County, Iowa
Our Model Tree links this Ralph Johnson across the 1920, 1930 and 1940 US Censuses in Delaware-County, Iowa (XGBoost, ~Confirmed), with identified parents Martha & George — first a son (b.~1912), then head of a 5-person household.
Age 28
b. ~1912
Male
Son
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Delaware-County, Iowa |
| Surname | Johnson |
| Given Name | Ralph |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | South Fork |
| 1935 Residence (County) | Delaware |
| Additional Details | |
| Occupation | Farm Labor |
| Industry | PW |
| Class of Worker | 200 |
| Hours Worked | 40 |
| Highest Grade | 8 |
| 1935 Residence | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Farm Laborer |
| Township / Ward | South Fork |
| Est. Birth Year | ~1912 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Ralph | Age | Birth yr |
|---|---|---|---|---|
| Frank Johnson | Head | — | 73 | ~1867 |
| Ralph Johnson | Son | — | 28 | ~1912 |
| Theodore Johnson | Son | — | 35 | ~1905 |
| Paul Johnson | Son | — | 30 | ~1910 |
| Martha Johnson | Spouse | — | 57 | ~1883 |
Census Appearances
1920
Delaware, Iowa
Son, age 8
Delaware, Iowa · implied b. ~1912 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Ralph |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Delaware, Iowa
Son, age 18
Delaware, Iowa · implied b. ~1912 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Ralph |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Occupation | Farm Labor |
| Industry | General farm |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Delaware-County, Iowa
Son, age 28
Delaware-County, Iowa · implied b. ~1912 — 5 household members
| Surname | Johnson |
| Given Name | Ralph |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | South Fork |
| 1935 Residence (County) | Delaware |
| Occupation | Farm Labor |
| Industry | PW |
| Class of Worker | 200 |
| Hours Worked | 40 |
| Highest Grade | 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 Johnson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Martha Johnson (~0.92 confidence) and father George Johnson (~0.92 confidence) and father Frank Johnson (~0.92 confidence) and father Frank Johnson (~0.92 confidence) and mother Martha Johnson (~0.92 confidence) and mother Martha Johnson (~0.92 confidence). The pedigree spans 1 generation with 6 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Martha Johnson
b. ~1864
Source mother
● Household
· direct · ~0.92
Father
George Johnson
b. ~1867
Source father
● Household
· direct · ~0.92
Father
Frank Johnson
b. ~1867
Source father
● Household
· direct · ~0.92
Father
Frank Johnson
b. ~1867
Source father
● Household
· direct · ~0.92
Mother
Martha Johnson
b. ~1883
Source mother
● Household
· direct · ~0.92
Mother
Martha Johnson
b. ~1883
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Ralph Johnson
Son · 1940 · age 28 · b. ~1912 · Iowa
★ You are viewing this record
Sibling
Theodore Johnson
Sibling · 1940 · age 35
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Paul Johnson
Sibling · 1940 · age 30
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 — Delaware-County, Iowa
Open full size
1940 US Federal Census — Delaware-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01155-00546)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Margaret E. Dunsbergen | 52 | Wife | Keeping House | Iowa |
| 42 | Genieve Stevenson | 45 | Head | Keeping House | Iowa |
| 43 | Elvin Stevenson | 22 | Son | Helper In Creamery | Iowa |
| 44 | Eldon J. Stevenson | 17 | Son | Farm Labor | Iowa |
| 45 | Matilda Stevenson | 18 | Daughter | Keeping House | Iowa |
| 46 | John Hunter Stevenson | 4 | Son | — | Iowa |
| 47 | Archie Payne | 30 | Head | Farm Labor | Iowa |
| 48 | Callista Payne | 30 | Wife | House Keeping | Iowa |
| 49 | Rose Mary Payne | 2 | Daughter | — | Iowa |
| 50 | Ruth Ann Payne | 0 | Daughter | — | Iowa |
| 51 | Sophia Holdiman | 48 | Head | Housekeeping | Iowa |
| 52 | Nicholas F. Holdiman | 17 | Son | Works At Home | Iowa |
| 53 | Edwin Leo Holdiman | 14 | Son | — | Iowa |
| 54 | Barney Shaffer | 73 | Head | 7 | Iowa |
| 55 | Annie Shaffer | 58 | Wife | Keeping House | Iowa |
| 56 | Donald Hickins | 4 | Grandson | — | Iowa |
| 57 | Fredrick A. J. Reinhold | 69 | Head | — | Iowa |
| 58 | Martha J. Reinhold | 38 | Sister | Keeping House | Iowa |
| 59 | Josephine Reinhold | 34 | Sister | 7 | Iowa |
| 60 | Elmer A. Moerner | 30 | Head | Service Station | Illinois |
| 61 | Minnie K. Moerner | 70 | Mother | — | Germany |
| 62 | Lillian V. Moerner | 32 | Sister | — | Illinois |
| 63 | Frank N. Johnson | 73 | Head | Carpenter | Iowa |
| 64 | Martha V. Johnson | 57 | Wife | House Keeping | Iowa |
| 65 | Theodore Johnson | 35 | Son | Farm Labor | Iowa |
| 66 | Paul Johnson | 30 | Son | Farm Labor | Iowa |
| 67 | Ralph Johnson THIS PERSON | 28 | Son | Farm Labor | Iowa |
| 68 | William P. Tapping | 30 | Head | Farmer | Iowa |
| 69 | Gertrude A. Tapping | 43 | Wife | Keeping House | Iowa |
| 70 | Laurabelle M. Tapping | 14 | Daughter | 6 | Iowa |
| 71 | Clarence J. Tapping | 9 | Son | 6 | Iowa |
| 72 | Florian B. Rieky | 29 | Head | Farmer | Iowa |
| 73 | Charles H. Barker | 27 | Hired Hand | Farm Labor | Iowa |
| 74 | Ernest P. Schiedler | 67 | Head | Farmer | Iowa |
| 75 | Archie V. Schiedler | 58 | Brother | Carpenter & Painter | Iowa |
| 76 | Inez J. Bent | 70 | Sister | Keeping House | Iowa |
| 77 | Louis M. Tapping | 30 | Head | Farmer | Iowa |
| 78 | Eva Lillie Tapping | 29 | Wife | Keeping House | Iowa |
| 79 | Louis Tapping | 9 | Daughter | — | Iowa |
| 80 | Pauline Tapping | 7 | Daughter | — | Iowa |
Pedigree Summary
Ralph + 2 siblings
Gen 1 · 6 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)