RA
Robert Armstrong — 1940 US Census Record
Model Tree available1940 United States Federal Census · Marion-County, Indiana
Our Model Tree links this Robert Armstrong across the 1920, 1930 and 1940 US Censuses in Marion-County, Indiana (XGBoost, ~Confirmed), with identified parents Robert & Urban — first a son (b.~1910), then head of a 5-person household.
Age 30
b. ~1910
Male
Son
Born: Indiana
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Marion-County, Indiana |
| Surname | Armstrong |
| Given Name | Robert M. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Indianapolis |
| 1935 Residence (County) | Marion |
| Additional Details | |
| Occupation | salesman |
| Industry | wholesale coal |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 378 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
| Occupation | Salesman |
| Township / Ward | Indianapolis |
| Est. Birth Year | ~1910 |
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 |
|---|---|---|---|---|
| Martha Armstrong | Daughter | — | 25 | ~1915 |
| Jayne Armstrong | Daughter | — | 22 | ~1918 |
| Mayme Armstrong | Head | — | 50 | ~1890 |
| Robert Armstrong | Son | — | 30 | ~1910 |
| Richard Armstrong | Son | — | 18 | ~1922 |
Census Appearances
1920
Marion, Indiana
Son, age 10
Marion, Indiana · implied b. ~1910 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Armstrong |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1930
Marion, Indiana
Son, age 20
Marion, Indiana · implied b. ~1910 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Armstrong |
| Given Name | Robert M. Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Occupation | Operator Clerk |
| Industry | Government Hospital |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1940
Marion-County, Indiana
Son, age 30
Marion-County, Indiana · implied b. ~1910 — 5 household members
| Surname | Armstrong |
| Given Name | Robert M. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Indianapolis |
| 1935 Residence (County) | Marion |
| Occupation | salesman |
| Industry | wholesale coal |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 378 |
| Highest Grade | Hs 4 |
| 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 Armstrong across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Robert Armstrong (~0.92 confidence) and father Urban Armstrong (~0.92 confidence) and mother Mayme Armstrong (~0.92 confidence) and mother Mayme Armstrong (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Robert Armstrong
b. ~1851
Source father
● Household
· direct · ~0.92
Father
Urban Armstrong
b. ~1884
Source father
● Household
· direct · ~0.92
Mother
Mayme Armstrong
b. ~1889
Source mother
● Household
· direct · ~0.92
Mother
Mayme Armstrong
b. ~1890
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Robert Armstrong
Son · 1940 · age 30 · b. ~1910 · Indiana
★ You are viewing this record
Sibling
Jayne Armstrong
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Richard Armstrong
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Martha Armstrong
Sibling · 1940 · age 25
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-t0627-01131-00178)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Ray Fry | 44 | Head | Salesman | Indiana |
| 42 | Robert C. Arnold | 38 | Head | Appliance Salesman | Indiana |
| 43 | Paul G. Arnold | 12 | Son | — | Indiana |
| 44 | Faye Arnold | 12 | Daughter | — | Indiana |
| 45 | Paul Jr. Arnold | 20 | Grandson | — | Indiana |
| 46 | Alphondor Bilodeau | 25 | Head | Structural Iron Worker | New Hampshire |
| 47 | Antoinette Bilodeau | 21 | Wife | — | Connecticut |
| 48 | Paul Bilodeau | 0 | Son | — | Indiana |
| 49 | Norman Ferguson | 27 | Head | Hair Stylist | North Ireland |
| 50 | Mary Margaret Ferguson | 27 | Wife | Cashier | Indiana |
| 51 | Mary C. D. King | 66 | Head | — | Indiana |
| 52 | Ida M. King | 64 | Sister | — | Indiana |
| 53 | Mayme Armstrong | 50 | Head | Bookkeeper | Indiana |
| 54 | Robert M. Armstrong THIS PERSON | 30 | Son | Salesman | Indiana |
| 55 | Martha Armstrong | 25 | Daughter | — | Indiana |
| 56 | Jayne Armstrong | 22 | Daughter | Bookkeeper | Indiana |
| 57 | Richard Armstrong | 18 | Son | — | Indiana |
| 58 | Otto Nasser | 29 | Head | Supervisor | Illinois |
| 59 | Bertha Nasser | 28 | Wife | — | Indiana |
| 60 | Frederick R. Nasser | 2 | Son | — | Indiana |
| 61 | Fred R. Farnam | 62 | Head | Inspector | Indiana |
| 62 | Nellie Farnam | 59 | Wife | — | Indiana |
| 63 | Roland Bohn | 34 | Head | Station Attendant Proprietor - Filling | Indiana |
| 64 | John T. Withers | 78 | Head | — | Indiana |
| 65 | Albt H. Elbershardt | 69 | Head | Surgeon Veterinary | Indiana |
| 66 | Arlton H. Elbershardt | 26 | Son | Repairman Proprietor - Radio | Indiana |
| 67 | Moy Yin | 60 | Head | Laundryman Proprietor | China |
| 68 | Anna F. Duvall | 40 | Head | Research Field | Indiana |
| 69 | Joan E. Duvall | 15 | Daughter | — | Indiana |
| 70 | James H. Mckown | 56 | Head | Barber Examiner | Indiana |
| 71 | Ethel M. Mckown | 51 | Wife | Trained Nurse | Indiana |
| 72 | Emma Basten | 64 | Lodger | — | Indiana |
| 73 | Emma Bale | 86 | Lodger | — | Indiana |
| 74 | William Bell | 35 | Servant | Servant Houseman | Arkansas |
| 75 | John Suite | 31 | Head | Repairman Proprietor - Shoe | Indiana |
| 76 | Helen Suite | 34 | Wife | — | Indiana |
| 77 | Clifford Suite | 57 | Head | Seaman | Indiana |
| 78 | Sylvia Suite | 55 | Wife | — | Indiana |
| 79 | Lloyd Hobbs | 40 | Head | Salesman Travelling | Indiana |
| 80 | Hobbs | 38 | Wife | — | Indiana |
Pedigree Summary
Robert + 3 siblings
Gen 1 · 4 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)