RC
Robert Cox — 1940 US Census Record
Model Tree available1940 United States Federal Census · Johnson-County, Iowa
Our Model Tree links this Robert Cox across the 1920, 1930 and 1940 US Censuses in Johnson-County, Iowa (XGBoost, ~Confirmed), with identified parents Ralph & Ralph — first a son (b.~1917), then head of a 4-person household.
Age 23
b. ~1917
Male
Son
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Johnson-County, Iowa |
| Surname | Cox |
| Given Name | Robert R. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Johnson |
| Additional Details | |
| Occupation | Painter |
| Industry | House-Painter |
| Class of Worker | PW |
| Income (1939) | 900 |
| Highest Grade | H 4 |
| 1935 Residence | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Painter |
| Township / Ward | Iowa City |
| Est. Birth Year | ~1917 |
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 Robert | Age | Birth yr |
|---|---|---|---|---|
| Florence Cox | Daughter | — | 21 | ~1919 |
| Ralph Cox | Head | — | 55 | ~1885 |
| Robert Cox | Son | — | 23 | ~1917 |
| Lillian Cox | Spouse | — | 50 | ~1890 |
Census Appearances
1920
Johnson, Iowa
Son, age 1
Johnson, Iowa · implied b. ~1919 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cox |
| Given Name | Robert |
| 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
Johnson, Iowa
Son, age 12
Johnson, Iowa · implied b. ~1918 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cox |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| 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
Johnson-County, Iowa
Son, age 23
Johnson-County, Iowa · implied b. ~1917 — 4 household members
| Surname | Cox |
| Given Name | Robert R. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Johnson |
| Occupation | Painter |
| Industry | House-Painter |
| Class of Worker | PW |
| Income (1939) | 900 |
| Highest Grade | H 4 |
| 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 Robert Cox across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Ralph Cox (~0.92 confidence) and father Ralph Cox (~0.92 confidence) and mother Lilian Cox (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Ralph Cox
b. ~1885
Source father
● Household
· direct · ~0.92
Father
Ralph Cox
b. ~1892
Source father
● Household
· direct · ~0.92
Mother
Lilian Cox
b. ~1893
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Robert Cox
Son · 1940 · age 23 · b. ~1917 · Iowa
★ You are viewing this record
Sibling
Florence Cox
Sibling · 1940 · age 21
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 — Johnson-County, Iowa
Open full size
1940 US Federal Census — Johnson-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01171-00433)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Bertha B. Flood | 60 | Wife | — | Iowa |
| 42 | Luverne Jackson | 25 | Head | Cleaner | Illinois |
| 43 | Katherine Jackson | 23 | Wife | — | Iowa |
| 44 | Anna Cook | 65 | Head | — | Iowa |
| 45 | Robert Cook | 47 | Son | Carpenter | Iowa |
| 46 | Edith Cook | 40 | Daughter | Teacher | Iowa |
| 47 | Barbara Semrad | 77 | Head | — | Iowa |
| 48 | Ludwig Bettag | 67 | Head | Steward | Germany |
| 49 | Hilda Bettag | 27 | Daughter | Clerk | Iowa |
| 50 | Louisa Vogt | 75 | Head | — | Iowa |
| 51 | Charles Beckman | 50 | Head | Mortician | Iowa |
| 52 | Lila E. Beckman | 46 | Wife | Attendant | Iowa |
| 53 | Marjorie Beckman | 24 | Daughter | Social Worker | Iowa |
| 54 | Charles Jr. Beckman | 20 | Son | — | Iowa |
| 55 | Theresa Solnar | 65 | Head | — | Iowa |
| 56 | Oretta Solnar | 40 | Daughter | Stenographer | Iowa |
| 57 | Joseph O. Chervinka | 70 | Head | Laborer | Czechoslovakia |
| 58 | Anna Chervinka | 66 | Wife | — | Iowa |
| 59 | Ralph A. Cox | 55 | Head | Painter | Iowa |
| 60 | Lillian Cox | 50 | Wife | Maid | Iowa |
| 61 | Robert R. Cox THIS PERSON | 23 | Son | Painter | Iowa |
| 62 | Florence Cox | 21 | Daughter | — | Iowa |
| 63 | Benjamin Monroe | 52 | Head | Painter | Iowa |
| 64 | Charles Pheobald | 52 | Head | Janitor | Iowa |
| 65 | Irma Pheobald | 52 | Wife | Cook | Illinois |
| 66 | Sara Mahr | 26 | Daughter | Clerk | Illinois |
| 67 | Jack Mahr | 20 | Son | New Worker | Illinois |
| 68 | Fred Neider | 52 | Head | Salesman | Iowa |
| 69 | Rose E. Neider | 48 | Wife | — | Iowa |
| 70 | Raymond Slavata | 50 | Head | Salesman | Iowa |
| 71 | Helen Slavata | 45 | Wife | — | Illinois |
| 72 | Geo. Baculis | 35 | Head | Cook | Greece |
| 73 | Dorothy Baculis | 32 | Wife | — | Iowa |
| 74 | Ramona Baculis | 12 | Daughter | — | Iowa |
| 75 | Anna Yabornicky | 54 | Head | Matron | Iowa |
| 76 | Frank Yabornicky | 32 | Son | Plumber | Iowa |
| 77 | Geo. Ruppert | 55 | Head | Cement Man | Iowa |
| 78 | Clara M. Ruppert | 52 | Wife | — | Iowa |
| 79 | Arthur C. Sherman | 53 | Head | Mechanic | Washington |
| 80 | Sophie Sherman | 44 | Wife | Maid | Iowa |
Pedigree Summary
Robert + 1 sibling
Gen 1 · 3 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)