RL
Robert Larson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Robert Larson across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1917), then head of a 9-person household.
Age 23
b. ~1917
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Larson |
| Given Name | Robert A. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Draftsman |
| Industry | Machine shop |
| Class of Worker | PW |
| Hours Worked | 42 |
| Income (1939) | 462 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Draftsman |
| Township / Ward | Chicago 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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Robert | Age | Birth yr |
|---|---|---|---|---|
| Blanche Larson | Daughter | — | 19 | ~1921 |
| George Fairson | Son | — | 27 | ~1913 |
| Nels Fairson | Other | — | 69 | ~1871 |
| Amanda Fairson | Spouse | — | 61 | ~1879 |
| George Larson | Son | — | 22 | ~1918 |
| Arthur Larson | Head | — | 53 | ~1887 |
| Robert Larson | Son | — | 23 | ~1917 |
| Anna Larson | Spouse | — | 52 | ~1888 |
| Lucy Fairson | Son | — | 32 | ~1908 |
Census Appearances
1930
Cook, Illinois
Son, age 13
Cook, Illinois · implied b. ~1917 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Larson |
| Given Name | Robert W. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 23
Cook-County, Illinois · implied b. ~1917 — 9 household members
| Surname | Larson |
| Given Name | Robert A. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | Draftsman |
| Industry | Machine shop |
| Class of Worker | PW |
| Hours Worked | 42 |
| Income (1939) | 462 |
| Highest Grade | H-4 |
| 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 Larson across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Robert Larson
Son · 1940 · age 23 · b. ~1917 · Illinois
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Sibling
George Fairson
Sibling · 1940 · age 27
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Blanche Larson
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
George Larson
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lucy Fairson
Sibling · 1940 · age 32
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 — Cook-County, Illinois
Open full size
1940 US Federal Census — Cook-County, Illinois
Page Contents
26 people indexed on this census page (nara:1940:m-t0627-00999-00926)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Margaret Carlson | 20 | roomer | Sorter | Illinois |
| 42 | Henry Allen | 36 | roomer | Baker | Illinois |
| 43 | George A. Morris | 36 | head | Salesman | Illinois |
| 44 | Pearl A. Morris | 24 | wife | — | Hungary |
| 45 | Charles J. Morris | 2 | son | — | Illinois |
| 47 | Ralph E. Walker | 32 | head | President | Illinois |
| 48 | Mildred O. Walker | 27 | wife | Book Keeper | Illinois |
| 50 | George A. Morris | 36 | head | Salesman | Illinois |
| 51 | Pearl A. Morris | 24 | wife | — | Hungary |
| 52 | Charles J. Morris | 2 | son | — | Illinois |
| 54 | Ralph E. Walker | 32 | head | President | Illinois |
| 55 | Mildred O. Walker | 27 | wife | Book Keeper | Illinois |
| 58 | Arthur C. Larson | 53 | head | Book Keeper | Illinois |
| 59 | Anna E. Larson | 52 | wife | — | Illinois |
| 60 | Robert A. Larson THIS PERSON | 23 | son | Draftsman | Illinois |
| 61 | George Larson | 22 | son | Laborer | Illinois |
| 62 | Blanche Larson | 19 | daughter | New Worker | Illinois |
| 63 | Nels Fairson | 69 | lodger | Barber | Sweden |
| 64 | Amanda Fairson | 61 | wife | — | Illinois |
| 65 | Lucy Fairson | 32 | son | Postal Clerk | Illinois |
| 66 | George Fairson | 27 | son | Accountant | Illinois |
| 67 | William Patterson | 45 | head | Auto Mechanic | Ireland |
| 68 | Mayora Patterson | 42 | wife | Laboratory Worker | Canada English |
| 69 | Ruby Patterson | 19 | daughter | Assistant | Canada English |
| 70 | William Jr. Patterson | 17 | son | — | Canada English |
| 71 | Ellen Johnson | 56 | lodger | — | Sweden |
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)