RA
Robert Alexander — 1940 US Census Record
Model Tree available1940 United States Federal Census · Marion-County, Illinois
Our Model Tree links this Robert Alexander across the 1920, 1930 and 1940 US Censuses in Marion-County, Illinois (XGBoost, ~Confirmed), with identified parents Justin & Mattie — first a son (b.~1912), then head of a 3-person household.
Age 28
b. ~1912
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Marion-County, Illinois |
| Surname | Alexander |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Sandoval Village |
| 1935 Residence (County) | Marion |
| Additional Details | |
| Occupation | Laborer |
| Industry | General |
| Class of Worker | PW |
| Hours Worked | 3 |
| Income (1939) | 168 |
| Highest Grade | H 1 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Laborer |
| Township / Ward | Sandoval Village |
| 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 |
|---|---|---|---|---|
| Justin Alexander | Head | — | 68 | ~1872 |
| Robert Alexander | Son | — | 28 | ~1912 |
| Mattie Alexander | Spouse | — | 68 | ~1872 |
Census Appearances
1920
Marion, Illinois
Son, age 8
Marion, Illinois · implied b. ~1912 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Alexander |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Marion, Illinois
Son, age 18
Marion, Illinois · implied b. ~1912 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Alexander |
| Given Name | Robert W |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | Laborer |
| Industry | Shoe Factory |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Marion-County, Illinois
Son, age 28
Marion-County, Illinois · implied b. ~1912 — 3 household members
| Surname | Alexander |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Sandoval Village |
| 1935 Residence (County) | Marion |
| Occupation | Laborer |
| Industry | General |
| Class of Worker | PW |
| Hours Worked | 3 |
| Income (1939) | 168 |
| Highest Grade | H 1 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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 Alexander across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Justin Alexander (~0.92 confidence) and mother Mattie Alexander (~0.92 confidence) and mother Mattie Alexander (~0.92 confidence) and father Gustav Alexander (~0.92 confidence) and mother Mattie Alexander (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Justin Alexander
b. ~1872
Source father
● Household
· direct · ~0.92
Mother
Mattie Alexander
b. ~1872
Source mother
● Household
· direct · ~0.92
Mother
Mattie Alexander
b. ~1872
Source mother
● Household
· direct · ~0.92
Father
Gustav Alexander
b. ~1873
Source father
● Household
· direct · ~0.92
Mother
Mattie Alexander
b. ~1873
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Robert Alexander
Son · 1940 · age 28 · b. ~1912 · Illinois
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Marion-County, Illinois
Open full size
1940 US Federal Census — Marion-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00853-00565)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Mary Sue Southerland | 21 | Wife | — | Texas |
| 2 | Billy Southerland | 3 | Son | — | Texas |
| 3 | Linda Sue Southerland | 1 | Daughter | — | Texas |
| 4 | Walter Putman | 33 | Head | Laborer | Illinois |
| 5 | Mildred W Putman | 28 | Wife | Laborer | Illinois |
| 6 | Velma Putman | 5 | Daughter | — | Illinois |
| 7 | James Putman | 3 | Son | — | Illinois |
| 8 | Jerry Putman | 2 | Son | — | Illinois |
| 9 | Wanda Putman | 0 | Daughter | — | Illinois |
| 10 | Charles Reynolds | 28 | Head | Laborer | Illinois |
| 11 | Velma Reynolds | 22 | Wife | — | Illinois |
| 12 | Carol Reynolds | 4 | Daughter | — | Illinois |
| 13 | Donald Reynolds | 2 | Son | — | Illinois |
| 14 | Alice Jett | 74 | Head | Driller | Illinois |
| 15 | Willie Scott | 48 | Head | Driller | Kentucky |
| 16 | Etta O Scott | 49 | Wife | — | Illinois |
| 17 | Ray Scott | 20 | Son | New Worker | Illinois |
| 18 | James Troutt | 54 | Head | Foreman | Illinois |
| 19 | Grace S Troutt | 45 | Wife | — | Illinois |
| 20 | James Jr Troutt | 19 | Son | New Worker | Illinois |
| 21 | John Holtz | 42 | Head | Trucker | Illinois |
| 22 | Mary S Holtz | 40 | Wife | — | Illinois |
| 23 | Wilbur Holtz | 15 | Son | — | Illinois |
| 24 | Hazel Holtz | 14 | Daughter | — | Illinois |
| 25 | Virginia Holtz | 8 | Daughter | — | Illinois |
| 26 | Shirley Ann Holtz | 2 | Daughter | — | Illinois |
| 27 | Dean Henderson | 30 | Head | Laborer | Oklahoma |
| 28 | Mary Henderson | 26 | Wife | — | Nebraska |
| 29 | Easie Seidel | 60 | Head | — | Illinois |
| 30 | Roscoe Seidel | 32 | Son | Spray Painter | Illinois |
| 31 | Justin Sr Alexander | 68 | Head | Old Age Asst | Illinois |
| 32 | Mattie Alexander | 68 | Wife | — | Illinois |
| 33 | Robert Alexander THIS PERSON | 28 | Son | Laborer | Illinois |
| 34 | Emma Locker | 76 | Head | — | Germany |
| 35 | Ernest Followell | 33 | Head | Signal-Man | Kentucky |
| 36 | Rosella S Followell | 29 | Wife | — | Illinois |
| 37 | Betty Jean Followell | 10 | Daughter | — | Illinois |
| 38 | William Followell | 7 | Son | — | Illinois |
| 39 | Ray Followell | 3 | Son | — | Illinois |
| 40 | Rudolph Schminder | 41 | Head | Truck Driver | Illinois |
Pedigree Summary
Robert
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)