JL
John Larson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Audubon-County, Iowa
Our Model Tree links this John Larson across the 1920, 1930 and 1940 US Censuses in Audubon-County, Iowa (XGBoost, ~Confirmed) — first a head (b.~1887), then head of a 3-person household.
Age 53
b. ~1887
Male
Head
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Audubon-County, Iowa |
| Surname | Larson |
| Given Name | John F. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 53 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Oakfield Township |
| 1935 Residence (County) | Audubon |
| Additional Details | |
| Occupation | Farming |
| Industry | Stock farm |
| Class of Worker | OA |
| Hours Worked | 72 |
| Income (1939) | 0 |
| Highest Grade | H 1 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Farming |
| Township / Ward | Oakfield Township |
| Est. Birth Year | ~1887 |
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 John | Age | Birth yr |
|---|---|---|---|---|
| John Larson | Head | — | 53 | ~1887 |
| Edwin Larson | Son | — | 19 | ~1921 |
| Nellie Larson | Spouse | — | 50 | ~1890 |
Census Appearances
1920
Audubon, Iowa
Head, age 32
Audubon, Iowa · implied b. ~1888 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Larsen |
| Given Name | John F |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 32 |
| Marital Status | Married |
| Birthplace | Iowa |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Denmark |
| Occupation | Farmer |
| Industry | General Farm |
| Class of Worker | Emp |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | O |
| Home Free/Mortgaged | M |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
Head, age 43
Audubon, Iowa · implied b. ~1887 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Larsen |
| Given Name | John F. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 43 |
| Marital Status | Married |
| Birthplace | Iowa |
| Age at First Marriage | 21 |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Denmark |
| Occupation | Farmer |
| Industry | Cattle feeding |
| Class of Worker | OA |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Radio Set | R |
| Veteran | No |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Audubon-County, Iowa
Head, age 53
Audubon-County, Iowa · implied b. ~1887 — 3 household members
| Surname | Larson |
| Given Name | John F. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 53 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Oakfield Township |
| 1935 Residence (County) | Audubon |
| Occupation | Farming |
| Industry | Stock farm |
| Class of Worker | OA |
| Hours Worked | 72 |
| Income (1939) | 0 |
| Highest Grade | H 1 |
| 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 John Larson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Larson
Head · 1940 · age 53 · b. ~1887 · Iowa
★ 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 — Audubon-County, Iowa
Open full size
1940 US Federal Census — Audubon-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01137-01020)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Leo Larsen | 15 | Son | Hired Helper | Iowa |
| 2 | Sylvia Larsen | 18 | Daughter | — | Iowa |
| 3 | Gladys Larsen | 14 | Daughter | — | Iowa |
| 4 | Joe Herbert | 33 | Head | Farmer | Iowa |
| 5 | Fern Herbert | 30 | Wife | — | Iowa |
| 6 | Wayne Herbert | 6 | Son | — | Iowa |
| 7 | Victor Erickson | 63 | Hired man | Helper | Colorado |
| 8 | Sophus Hansen | 50 | Head | Farmer | Iowa |
| 9 | Sarah Hansen | 41 | Wife | — | Indiana |
| 10 | Le Roy Hansen | 10 | Son | — | Iowa |
| 11 | Benjamin C. Hough | 48 | Head | Farmer | Iowa |
| 12 | Emma Hough | 45 | Wife | — | Iowa |
| 13 | Harold Hough | 18 | Son | Farm Helper | Iowa |
| 14 | Hans Boken | 33 | Head | Farming | Iowa |
| 15 | Josephine Boken | 27 | Wife | — | Iowa |
| 16 | Wendell Boken | 6 | Son | — | Iowa |
| 17 | Gordon Boken | 2 | Son | — | Iowa |
| 18 | Marius Christensen | 57 | Head | Farming | Denmark |
| 19 | Sena Christensen | 62 | Wife | — | Denmark |
| 20 | George P. Sornsen | 44 | Head | Farming | Iowa |
| 21 | Winifred Sornsen | 46 | Wife | — | Iowa |
| 22 | Kenneth Sornsen | 16 | Son | — | Iowa |
| 23 | George Jr. Sornsen | 12 | Son | — | Iowa |
| 24 | Franklin Sornsen | 7 | Son | — | Iowa |
| 25 | Martin Nelson | 59 | Head | Farming | Iowa |
| 26 | Laura Nelson | 56 | Wife | — | Iowa |
| 27 | Russel Nelson | 24 | Son | Farm Helper | Iowa |
| 28 | Raynold Nelson | 22 | Son | Farm Helper | Iowa |
| 29 | Harvey Nelson | 17 | Son | — | Iowa |
| 30 | Irene Mardesen | 27 | Daughter | — | Iowa |
| 31 | Marvin Dean Mardesen | 4 | Grandson | — | Iowa |
| 32 | Henry Johnson | 63 | Head | Farming | Iowa |
| 33 | Rosa Johnson | 59 | Wife | — | Iowa |
| 34 | Hurst Johnson | 38 | Son | Hired Help | Iowa |
| 35 | John F. Larson THIS PERSON | 53 | Head | Farming | Iowa |
| 36 | Nellie K. Larson | 50 | Wife | — | Iowa |
| 37 | Edwin F. Larson | 19 | Son | Farm Helper | Iowa |
| 38 | Dayton P. Larson | 56 | Head | Farming | Iowa |
| 39 | Lena Larson | 53 | Wife | — | Iowa |
| 40 | Marel Larson | 18 | Son | Truck Driver | Iowa |
Related Census Records
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)