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Robert Johnson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cedar-County, Iowa
Our Model Tree links this Robert Johnson across the 1920, 1930 and 1940 US Censuses in Cedar-County, Iowa (XGBoost, ~Confirmed), with identified parents Grayson & Graydon — first a son (b.~1919), then head of a 5-person household.
Age 21
b. ~1919
Male
Son
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cedar-County, Iowa |
| Surname | Johnson |
| Given Name | Robert H. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Pioneer Twp |
| 1935 Residence (County) | Cedar |
| Additional Details | |
| Highest Grade | C 1 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Pioneer Twp |
| Est. Birth Year | ~1919 |
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 Robert | Age | Birth yr |
|---|---|---|---|---|
| Grayson Johnson | Head | — | 57 | ~1883 |
| Olive Brabeck | Other | — | 81 | ~1859 |
| Forrest Johnson | Son | — | 19 | ~1921 |
| Robert Johnson | Son | — | 21 | ~1919 |
| Lila Johnson | Spouse | — | 50 | ~1890 |
Census Appearances
1920
Cedar, Iowa
Son, age 1
Cedar, Iowa · implied b. ~1919 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Robert H |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Cedar, Iowa
Son, age 11
Cedar, Iowa · implied b. ~1919 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Robert G. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Cedar-County, Iowa
Son, age 21
Cedar-County, Iowa · implied b. ~1919 — 5 household members
| Surname | Johnson |
| Given Name | Robert H. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Pioneer Twp |
| 1935 Residence (County) | Cedar |
| Highest Grade | C 1 |
| 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 Robert Johnson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Grayson Johnson (~0.92 confidence) and father Graydon Johnson (~0.92 confidence) and father Andrew Johnson (~0.92 confidence) and mother Lila Johnson (~0.92 confidence) and mother Lila Johnson (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Grayson Johnson
b. ~1883
Source father
● Household
· direct · ~0.92
Father
Graydon Johnson
b. ~1889
Source father
● Household
· direct · ~0.92
Father
Andrew Johnson
b. ~1890
Source father
● Household
· direct · ~0.92
Mother
Lila Johnson
b. ~1890
Source mother
● Household
· direct · ~0.92
Mother
Lila Johnson
b. ~1886
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Robert Johnson
Son · 1940 · age 21 · b. ~1919 · Iowa
★ You are viewing this record
Sibling
Forrest Johnson
Sibling · 1940 · age 19
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 — Cedar-County, Iowa
Open full size
1940 US Federal Census — Cedar-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01145-00960)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Nettie Arbingast | 70 | Mother-in-law | — | Iowa |
| 42 | Claude O. Ferguson | 52 | Head | Farm Operator | Iowa |
| 43 | Esther Ferguson | 48 | Wife | — | Iowa |
| 44 | Jean Ferguson | 8 | Daughter | — | Iowa |
| 45 | Mary Carol Ferguson | 6 | Daughter | — | Iowa |
| 46 | Thomas Ferguson | 5 | Son | — | Iowa |
| 47 | Chester O. Noble | 24 | Head | Farm Labor | Iowa |
| 48 | Maxine Noble | 22 | Wife | — | Iowa |
| 49 | Mary Jean Noble | 2 | Daughter | — | Iowa |
| 50 | Ralph S. Hummel | 27 | Head | Farm Operator | Iowa |
| 51 | Lillian Hummel | 26 | Wife | — | Iowa |
| 52 | Arlene Hummel | 4 | Daughter | — | Iowa |
| 53 | Jeanette Hummel | 2 | Daughter | — | Iowa |
| 54 | Joan Hummel | 2 | Daughter | — | Iowa |
| 55 | Morris Brammer | 21 | Hired man | Farm Labor | Iowa |
| 56 | Lyle O. Whitache | 39 | Head | Farm Operator | Iowa |
| 57 | Merle Clifton | 32 | Head | Farm Operator | Iowa |
| 58 | Violet Clifton | 31 | Wife | — | Iowa |
| 59 | Alberta Clifton | 8 | Daughter | — | Iowa |
| 60 | Verla Clifton | 6 | Daughter | — | Iowa |
| 61 | Gregory Worthington | 59 | Hired man | — | Kentucky |
| 62 | Grayson B. Johnson | 57 | Head | Farm Operator | Iowa |
| 63 | Lila Bee Johnson | 50 | Wife | — | Iowa |
| 64 | Robert H. Johnson THIS PERSON | 21 | Son | — | Iowa |
| 65 | Forrest W. Johnson | 19 | Son | Teacher | Iowa |
| 66 | Olive J. Brabeck | 81 | Mother-in-law | — | Iowa |
| 67 | Void-Error | None | — | — | — |
| 68 | Thomas L. Leyen | 64 | Head | Station Agent | Iowa |
| 69 | Ella M. Leyen | 62 | Wife | — | Iowa |
| 70 | George D. Connor | 67 | Head | Farm Operator | Iowa |
| 71 | Lois Connor | 63 | Wife | — | Iowa |
| 72 | R. L. Connor | 31 | Head | Farm Operator | Iowa |
| 73 | Wayne Borden | 23 | Hired man | Farm Labor | Iowa |
| 74 | Walter Johnson | 30 | Head | Farm Operator | Iowa |
| 75 | Ruth Johnson | 24 | Wife | — | Iowa |
| 76 | W. W. Hillase | 64 | Hired man | Farm Labor | Iowa |
| 77 | Lois Hillase | 19 | Hired man's wife | Housework | Iowa |
| 78 | Joan Johnson | 2 | Daughter | — | Iowa |
| 79 | Void-Error | 25 | — | — | Iowa |
| 80 | W. S. O. Johnston | 68 | Head | Farm Operator | Iowa |
Pedigree Summary
Robert + 1 sibling
Gen 1 · 5 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)