RC
Robert Cox — 1940 US Census Record
Model Tree available1940 United States Federal Census · Marion-County, Indiana
Our Model Tree links this Robert Cox across the 1920, 1930 and 1940 US Censuses in Marion-County, Indiana (XGBoost, ~Confirmed), with identified parents Leo & Martha — first a son (b.~1912), then head of a 3-person household.
Age 28
b. ~1912
Male
Son
Born: Indiana
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Marion-County, Indiana |
| Surname | Cox |
| Given Name | Robert E. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Indianapolis City |
| 1935 Residence (County) | Marion |
| Additional Details | |
| Occupation | Attendant |
| Industry | Filling Station |
| Class of Worker | OA |
| Hours Worked | 34 |
| Income (1939) | 0 |
| Highest Grade | Hs 2 |
| 1935 Residence | Same place |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
| Occupation | Attendant |
| Township / Ward | Indianapolis City |
| 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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Robert | Age | Birth yr |
|---|---|---|---|---|
| Martha Cox | Head | — | 56 | ~1884 |
| Edward Cox | Son | — | 23 | ~1917 |
| Robert Cox | Son | — | 28 | ~1912 |
Census Appearances
1920
Marion, Indiana
Son, age 8
Marion, Indiana · implied b. ~1912 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cox |
| Given Name | Robert L. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Occupation | none |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1930
Marion, Indiana
Son, age 18
Marion, Indiana · implied b. ~1912 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cox |
| Given Name | Robert E. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Occupation | Newsboy |
| Industry | Street |
| Class of Worker | O |
| Can Read/Write | Yes |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1940
Marion-County, Indiana
Son, age 28
Marion-County, Indiana · implied b. ~1912 — 3 household members
| Surname | Cox |
| Given Name | Robert E. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Indianapolis City |
| 1935 Residence (County) | Marion |
| Occupation | Attendant |
| Industry | Filling Station |
| Class of Worker | OA |
| Hours Worked | 34 |
| Income (1939) | 0 |
| Highest Grade | Hs 2 |
| 1935 Residence | Same place |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
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 Leo Cox (~0.92 confidence) and mother Martha Cox (~0.92 confidence) and mother Martha Cox (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Leo Cox
b. ~1880
Source father
● Household
· direct · ~0.92
Mother
Martha Cox
b. ~1884
Source mother
● Household
· direct · ~0.92
Mother
Martha Cox
b. ~1885
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Robert Cox
Son · 1940 · age 28 · b. ~1912 · Indiana
★ You are viewing this record
Sibling
Edward Cox
Sibling · 1940 · age 23
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 — Marion-County, Indiana
Open full size
1940 US Federal Census — Marion-County, Indiana
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-01126-00329)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Chris Fleming | 9 | Son | — | Indiana |
| 42 | Effie Brown | 59 | Mother-in-law | — | Indiana |
| 43 | Roy S. Baird | 43 | Head | Assembly Line | Illinois |
| 44 | Beatrice Baird | 43 | Wife | — | Ohio |
| 45 | Martha E. Cox | 56 | Head | — | Indiana |
| 46 | Robert E. Cox THIS PERSON | 28 | Son | Attendant | Indiana |
| 47 | Edward D. Cox | 23 | Son | Elevator Operator | Indiana |
| 48 | Melvin O. Jarvis | 77 | Head | — | Indiana |
| 49 | Mary F. Jarvis | 69 | Wife | — | Kansas |
| 50 | Edward F. Kennedy | 44 | Head | Life Insurance Agent | Indiana |
| 51 | Susie Kennedy | 46 | Wife | Topper | Indiana |
| 52 | Dorothy Ann Kennedy | 10 | Daughter | — | Indiana |
| 53 | William H. Mccauley | 70 | Head | — | Indiana |
| 54 | Kathryn Mccauley | 56 | Wife | — | Indiana |
| 55 | Flora Lee Mccauley | 4 | Daughter | — | Indiana |
| 56 | William E. Corwin | 46 | Head | — | Ohio |
| 57 | Hattie C. Corwin | 44 | Wife | — | Kentucky |
| 58 | Augustus J. Frazee | 71 | Head | — | Indiana |
| 59 | Electa J. Frazee | 70 | Wife | — | Indiana |
| 60 | Alfred Mcguire | 75 | Head | — | Indiana |
| 61 | Tirzah F. Mcguire | 69 | Wife | — | Alabama |
| 62 | Charles Dowden | 28 | Head | Shoe Repairman | Indiana |
| 63 | Freda Dowden | 25 | Wife | — | Indiana |
| 64 | Patricia Dowden | 2 | Daughter | — | Indiana |
| 65 | John R. Hoagland | 29 | Head | Stenographer | Indiana |
| 66 | Elizabeth Hoagland | 39 | Wife | — | Illinois |
| 67 | Hayden Hoagland | 16 | Son | — | Illinois |
| 68 | Glenn W. Pomeroy | 47 | Head | Auto Trimmer | Indiana |
| 69 | Esther Pomeroy | 46 | Wife | — | Indiana |
| 70 | Eloise Pomeroy | 17 | Daughter | — | Indiana |
| 71 | Frances Pomeroy | 15 | Daughter | — | Indiana |
| 72 | Robert Pomeroy | 12 | Son | — | Indiana |
| 73 | Herman Strait | 29 | Head | Breadman | Indiana |
| 74 | Lavona Strait | 24 | Wife | Topper | Indiana |
| 75 | Clara Range | 33 | Head | Clerk | Indiana |
| 76 | William E. Broughton | 53 | Head | Meter Setter | Indiana |
| 77 | Tina Broughton | 50 | Wife | — | Indiana |
| 78 | Frances Foust | 36 | Head | File Clerk | Illinois |
| 79 | Donna Jean Foust | 17 | Daughter | — | Indiana |
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)