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Oscar Larson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Oscar Larson across the 1910, 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1889), then head of a 3-person household.
Age 51
b. ~1889
Male
Head
Born: Sweden
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Larson |
| Given Name | Oscar |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 51 |
| Marital Status | Married |
| Birthplace | Sweden |
| 1935 Residence (City) | Chicago city |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Carpenter |
| Industry | Building Contractor |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1200 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth Country | Sweden |
| Birthplace (normalized) | sweden |
| Occupation | Carpenter |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1889 |
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 Oscar | Age | Birth yr |
|---|---|---|---|---|
| Oscar Larson | Head | — | 51 | ~1889 |
| Evelyn Larson | Daughter | — | 24 | ~1916 |
| Selma Larson | Spouse | — | 57 | ~1883 |
Census Appearances
1910
Cook, Illinois
Other, age 22
Cook, Illinois · implied b. ~1888 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Larson |
| Given Name | Oscar |
| Relationship to Head | Boarder |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Sweden |
| Year of Immigration | 1907 |
| Naturalization Status | Alien |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | English |
| Birth Country | Sweden |
| Birthplace (normalized) | sweden |
1920
Cook, Illinois
Other, age 31
Cook, Illinois · implied b. ~1889 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Larson |
| Given Name | Oscar |
| Relationship to Head | Maid |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | Sweden |
| Year of Immigration | 1904 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | Maid |
| Industry | Private Family |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Swedish |
| Birth Country | Sweden |
| Year of Naturalization | 1912 |
| Birthplace (normalized) | sweden |
1930
Cook, Illinois
Head, age 40
Cook, Illinois · implied b. ~1890 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Larsen |
| Given Name | Oscar |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Sweden |
| Naturalization Status | Naturalized |
| Year of Immigration | 1905 |
| Age at First Marriage | 21 |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | carpenter |
| Industry | Building |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | Swedish |
| Home Owned/Rented | O |
| Home Value / Rent | 4500 |
| Radio Set | R |
| Veteran | no |
| Birth Country | Sweden |
| Birthplace (normalized) | sweden |
1940
Cook-County, Illinois
Head, age 51
Cook-County, Illinois · implied b. ~1889 — 3 household members
| Surname | Larson |
| Given Name | Oscar |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 51 |
| Marital Status | Married |
| Birthplace | Sweden |
| 1935 Residence (City) | Chicago city |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Occupation | Carpenter |
| Industry | Building Contractor |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1200 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth Country | Sweden |
| Birthplace (normalized) | sweden |
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 Oscar Larson across 4 US Census years (1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Oscar Larson
Head · 1940 · age 51 · b. ~1889 · Illinois
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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
40 people indexed on this census page (nara:1940:m-t0627-01002-00237)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Shirley R Harsin | 23 | Daughter | Switchboard Operator | Illinois |
| 42 | Oscar Larson THIS PERSON | 51 | Head | Carpenter | Sweden |
| 43 | Selma Larson | 57 | Wife | — | Sweden |
| 44 | Evelyn Larson | 24 | Daughter | File Clerk | Illinois |
| 45 | A. Oscar Hedquist | 33 | Head | Senior Messenger | Illinois |
| 46 | Anna C Hedquist | 34 | Wife | — | Sweden |
| 47 | Philip B. Hedquist | 2 | Son | — | — |
| 48 | Charles R. Eckert | 65 | Head | — | Illinois |
| 49 | Alma O Eckert | 60 | Wife | — | Illinois |
| 50 | Joseph Blomberg | 40 | Head | Postal Clerk | Germany |
| 51 | Rose Blomberg | 36 | Wife | — | Poland |
| 52 | Mary-Ann Blomberg | 9 | Daughter | — | Illinois |
| 53 | Robert O. Blomberg | 2 | Son | — | — |
| 54 | Peter Rode | 60 | Head | Janitor | Norway |
| 55 | Hulda Rode | 62 | Wife | — | Illinois |
| 56 | Hanna Rode | 27 | Daughter | Saleslady | Minnesota |
| 57 | Harry Weintraub | 42 | Head | Printer | Poland |
| 58 | Pauline Weintraub | 37 | Wife | — | Poland |
| 59 | Sylvia Weintraub | 17 | Daughter | — | Illinois |
| 60 | Beverly Weintraub | 12 | Daughter | — | Illinois |
| 61 | Jack Foreman | 35 | Head | Machinist | Russia |
| 62 | Myrtle Foreman | 27 | Wife | — | Illinois |
| 63 | Barry Foreman | 5 | Son | — | Illinois |
| 64 | William Ford | 32 | Head | Railroad Clerk | Illinois |
| 65 | Jane Ford | 26 | Wife | — | Illinois |
| 66 | Margaret Ford | 0 | Daughter | — | — |
| 67 | Edmund J Hickey | 25 | Head | Insurance Agent | Illinois |
| 68 | Mildred C. Hickey | 25 | Wife | — | Illinois |
| 69 | Thomas J. Hickey | 1 | Son | — | — |
| 70 | George Kochenberger | 34 | Head | Mail Carrier | Illinois |
| 71 | Gabriella Kochenberger | 29 | Wife | — | New York |
| 72 | Harry Geilke | 40 | Head | Fireman | Minnesota |
| 73 | Elsie Geilke | 32 | Wife | — | Germany |
| 74 | Gloria Geilke | 9 | Daughter | — | Illinois |
| 75 | Jack Kapp | 40 | Head | Shoe Merchant | Russia |
| 76 | Clara Kapp | 38 | Wife | — | Illinois |
| 77 | Robert Kapp | 15 | Son | — | Illinois |
| 78 | Sherwin Kapp | 6 | Son | — | — |
| 79 | Alfred Leiser | 32 | Head | Research Engineer | Germany |
| 80 | Eugenie Leiser | 38 | Wife | — | Switzerland |
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)