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Robert Griffin — 1940 US Census Record
Model Tree available1940 United States Federal Census · Marion-County, Indiana
Our Model Tree links this Robert Griffin across the 1920, 1930 and 1940 US Censuses in Marion-County, Indiana (XGBoost, ~Confirmed), with identified parents Martin & Katherine — first a son (b.~1912), then head of a 4-person household.
Age 28
b. ~1912
Male
Son
Born: Indiana
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Marion-County, Indiana |
| Surname | Griffin |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Indianapolis |
| 1935 Residence (County) | Marion |
| Additional Details | |
| Highest Grade | C 2 |
| 1935 Residence | Same place |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
| Township / Ward | Indianapolis |
| 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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Robert | Age | Birth yr |
|---|---|---|---|---|
| Robert Griffin | Son | — | 28 | ~1912 |
| Katherine Griffin | Spouse | — | 58 | ~1882 |
| Martin Griffin | Head | — | 61 | ~1879 |
| Katherine Griffin | Daughter | — | 20 | ~1920 |
Census Appearances
1920
Marion, Indiana
Son, age 6
Marion, Indiana · implied b. ~1914 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Griffin |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Mother Tongue | English |
| Birth State | Indiana |
| Birth Country | United States |
| Year of Naturalization | Yes |
| Birthplace (normalized) | indiana |
1930
Marion, Indiana
Son, age 17
Marion, Indiana · implied b. ~1913 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Griffin |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| 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 — 4 household members
| Surname | Griffin |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Indianapolis |
| 1935 Residence (County) | Marion |
| Highest Grade | C 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 Griffin across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Martin Griffin (~0.92 confidence) and mother Katherine Griffin (~0.92 confidence) and mother Martha Griffin (~0.92 confidence) and father Fred Griffin (~0.92 confidence) and father Fred Griffin (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Martin Griffin
b. ~1879
Source father
● Household
· direct · ~0.92
Mother
Katherine Griffin
b. ~1882
Source mother
● Household
· direct · ~0.92
Mother
Martha Griffin
b. ~1882
Source mother
● Household
· direct · ~0.92
Father
Fred Griffin
b. ~1883
Source father
● Household
· direct · ~0.92
Father
Fred Griffin
b. ~1884
Source father
● Household
· direct · ~0.92
This person
Anchor record
Robert Griffin
Son · 1940 · age 28 · b. ~1912 · Indiana
★ You are viewing this record
Sibling
Katherine Griffin
Sibling · 1940 · age 20
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
40 people indexed on this census page (nara:1940:m-t0627-01123-00456)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Fred B. Beck | 37 | Head | Grocer | Indiana |
| 2 | Otillia Beck | 37 | Wife | — | Indiana |
| 3 | Mary Rosaline Beck | 2 | Daughter | — | Indiana |
| 4 | Kathryn Lysaght | 43 | Sister-in-law | Bookkeeper | Indiana |
| 5 | Warren M. Bird | 58 | Head | Cashier | Pennsylvania |
| 6 | Ada B. Bird | 47 | Wife | Salesman | Indiana |
| 7 | Helen M. Royer | 25 | Daughter | Saleslady | Indiana |
| 8 | Thomas J. Meeker | 54 | Head | Salesman | Indiana |
| 9 | Charlotte Meeker | 38 | Wife | — | Indiana |
| 10 | Hubert Teague | 49 | Head | Salesman | Indiana |
| 11 | Mildred Teague | 48 | Wife | — | Ohio |
| 12 | Harley M. Davis | 58 | Head | Salesman | Indiana |
| 13 | Della Davis | 56 | Wife | — | Indiana |
| 14 | Dorothy Neilson | 29 | Daughter | Saleslady | Indiana |
| 15 | Wallace D. Neilson | 32 | Son-in-law | Salesman | S. Africa |
| 16 | Judith Neilson | 5 | Granddaughter | — | Indiana |
| 17 | Herbert Hulse | 39 | Brother-in-law | — | Indiana |
| 18 | Leon L. Kempler | 39 | Head | Manager | Ohio |
| 19 | Minnie Kempler | 31 | Wife | — | Indiana |
| 20 | Martin Griffin | 61 | Head | Engineer | Indiana |
| 21 | Katherine Griffin | 58 | Wife | — | Indiana |
| 22 | Robert Griffin THIS PERSON | 28 | Son | — | Indiana |
| 23 | Katherine Griffin | 20 | Daughter | — | Indiana |
| 24 | Oliver R. Borcherding | 63 | Head | Assistant Manager | Ohio |
| 25 | Carry A. Borcherding | 42 | Wife | — | Mississippi |
| 26 | Mary Alice Borcherding | 15 | Daughter | — | Mississippi |
| 27 | William Borcherding | 12 | Son | — | Indiana |
| 28 | Ethel F. Yeager | 32 | Head | Saleslady | Indiana |
| 29 | John A. Yeager | 22 | Son | Buyer | Illinois |
| 30 | Harry H. Jones | 60 | Head | Manager | Indiana |
| 31 | Pearl Jones | 57 | Wife | — | Indiana |
| 32 | Avid Jones | 27 | Son | Salesman | Indiana |
| 33 | Forest R. Beall | 27 | Lodger | Accountant | Indiana |
| 34 | Knox P. Blevins | 45 | Head | Salesman | Kentucky |
| 35 | Bessie Blevins | 45 | Wife | — | Kentucky |
| 36 | Alex Borin | 25 | Head | Personal | West Virginia |
| 37 | Myra Borin | 23 | Wife | — | Europe |
| 38 | Natalie Borin | 1 | Daughter | — | Indiana |
| 39 | Sam Levinsky | 28 | Head | Accounting | Indiana |
| 40 | Dora Levinsky | 26 | Wife | — | New York |
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)