WL
William Larson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Union-County, South Dakota
Our Model Tree links this William Larson across the 1920, 1930 and 1940 US Censuses in Union-County, South Dakota (XGBoost, ~Confirmed) — first a head (b.~1901), then head of a 2-person household.
Age 39
b. ~1901
Male
Head
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Union-County, South Dakota |
| Surname | Larson |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 39 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Alcester |
| 1935 Residence (County) | Union |
| Additional Details | |
| Occupation | Laborer |
| Industry | W.P.A. |
| Class of Worker | GW |
| Hours Worked | 38 |
| Income (1939) | 505 |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Laborer |
| Township / Ward | Alcester |
| Est. Birth Year | ~1901 |
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.
2 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| William Larson | Head | — | 39 | ~1901 |
| Leo Larson | Son | — | 8 | ~1932 |
Census Appearances
1920
Union, South …
Other, age 19
Union, South Dakota · implied b. ~1901 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Larson |
| Given Name | Willie S. |
| Relationship to Head | brother |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | laborer |
| Industry | Gen farm |
| Class of Worker | W |
| Can Read | No |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Union, South …
Head, age 28
Union, South Dakota · implied b. ~1902 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Larson |
| Given Name | William C |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Married |
| Birthplace | Iowa |
| Age at First Marriage | 27 |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | Laborer |
| Industry | Railroad |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 15 |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Union-County, South …
Head, age 39
Union-County, South Dakota · implied b. ~1901 — 2 household members
| Surname | Larson |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 39 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Alcester |
| 1935 Residence (County) | Union |
| Occupation | Laborer |
| Industry | W.P.A. |
| Class of Worker | GW |
| Hours Worked | 38 |
| Income (1939) | 505 |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
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 William Larson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Larson
Head · 1940 · age 39 · b. ~1901 · South Dakota
★ 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 — Union-County, South Dakota
Open full size
1940 US Federal Census — Union-County, South Dakota
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03869-00019)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Mattie Onstad | 71 | Head | — | Norway |
| 42 | Arthur Onstad | 42 | Son | Clerk | Iowa |
| 43 | Maurice Onstad | 36 | Son | Clerk | Iowa |
| 44 | Stella Onstad | 26 | Daughter | Clerk | South Dakota |
| 45 | Albert Myhr | 52 | Head | Auditor | Iowa |
| 46 | Amanda Myhr | 49 | Wife | — | Iowa |
| 47 | Doris Myhr | 20 | Daughter | — | South Dakota |
| 48 | Robert Myhr | 19 | Son | — | — |
| 49 | Summer Myhr | 24 | Son | Truck Driver | Iowa |
| 50 | Viola Myhr | 25 | Daughter | Registered Nurse | South Dakota |
| 51 | Sherman Pierson | 47 | Head | Mail Carrier | Iowa |
| 52 | Villie Pierson | 41 | Wife | — | South Dakota |
| 53 | Shirley Pierson | 23 | Daughter | N. Westrn Bell Telephone | — |
| 54 | Marcia Pierson | 19 | Daughter | — | — |
| 55 | Stanley Pierson | 16 | Son | Newspaper Route | — |
| 56 | Alice Emmert | 37 | Head | Restaurant | — |
| 57 | David Oberg | 79 | Head | — | Sweden |
| 58 | Hannah Oberg | 73 | Wife | — | Sweden |
| 59 | William Larson THIS PERSON | 39 | Head | Laborer | Iowa |
| 60 | Leo Larson | 8 | Son | — | South Dakota |
| 61 | Kate Meinhans | 54 | Head | — | Illinois |
| 62 | Fred Meinhans | 26 | Son | Laborer | South Dakota |
| 63 | Reinie Meinhans | 15 | Son | — | — |
| 64 | Ella Meinhans | 12 | Daughter | — | — |
| 65 | Bernie Meinhans | 6 | Son | — | — |
| 66 | George Albertius | 52 | Head | Radiator Repair & Repair Shop | Iowa |
| 67 | Reece Reynolds | 55 | Head | Laborer | Missouri |
| 68 | Nora Reynolds | 52 | Wife | — | Iowa |
| 69 | Charles Westling | 62 | Head | Laborer | Sweden |
| 70 | Caroline Westling | 58 | Wife | — | Sweden |
| 71 | Loyal Westling | 30 | Son | Clerk | South Dakota |
| 72 | Harold Westling | 27 | Son | Construction | South Dakota |
| 73 | Carrie Westling | 21 | Daughter in Law | — | — |
| 74 | Alf Amundesen | 45 | Head | Night Marshall | Norway |
| 75 | Ida Amundesen | 30 | Wife | — | Iowa |
| 76 | Larry Amundesen | 7 | Son | — | South Dakota |
| 77 | Earl Ericson | 34 | Lodger | General Farm & South Dakota | — |
| 78 | Hayo Keih | 52 | Head | Public Service | — |
| 79 | Dora Keih | 54 | Wife | — | Iowa |
| 80 | Jeanette Keih | 27 | Daughter | Helper | South Dakota |
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)