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John Jensen — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Audubon-County, Iowa
Our Model Tree links this John Jensen across the 1920, 1930 and 1940 US Censuses in Audubon-County, Iowa (XGBoost, ~Confirmed) — first a head (b.~1886), then head of a 4-person household.
Age 54
b. ~1886
Male
Head
Born: Denmark
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Audubon-County, Iowa |
| Surname | Jensen |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 54 |
| Marital Status | Married |
| Birthplace | Denmark |
| 1935 Residence (City) | Leroy Twp. |
| 1935 Residence (County) | Audubon |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farming |
| Class of Worker | OA |
| Hours Worked | 60 |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Iowa |
| Birth Country | Denmark |
| Birthplace (normalized) | denmark |
| Occupation | Farmer |
| Township / Ward | Leroy Twp |
| Est. Birth Year | ~1886 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Theora Jensen | Daughter | — | 31 | ~1909 |
| John Jensen | Head | — | 54 | ~1886 |
| Leonard Jensen | Son | — | 29 | ~1911 |
| Bertha Jensen | Spouse | — | 54 | ~1886 |
Census Appearances
1920
Audubon, Iowa
Head, age 34
Audubon, Iowa · implied b. ~1886 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jensen |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 34 |
| Marital Status | Married |
| Birthplace | Denmark |
| Year of Immigration | 1892 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Denmark |
| Occupation | Farmer |
| Industry | General Farm |
| Class of Worker | OA |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Danish |
| Home Owned/Rented | O |
| Home Free/Mortgaged | M |
| Birth Country | Denmark |
| Year of Naturalization | 1907 |
| Birthplace (normalized) | denmark |
1930
Audubon, Iowa
Head, age 44
Audubon, Iowa · implied b. ~1886 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jensen |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 44 |
| Marital Status | Married |
| Birthplace | Denmark |
| Naturalization Status | Naturalized |
| Year of Immigration | 1899 |
| Age at First Marriage | 22 |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Denmark |
| Occupation | Farmer |
| Industry | General farming |
| Class of Worker | OA |
| Can Read/Write | Yes |
| Mother Tongue | Danish |
| Home Owned/Rented | R |
| Veteran | No |
| Birth Country | Denmark |
| Birthplace (normalized) | denmark |
1940
Audubon-County, Iowa
Head, age 54
Audubon-County, Iowa · implied b. ~1886 — 4 household members
| Surname | Jensen |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 54 |
| Marital Status | Married |
| Birthplace | Denmark |
| 1935 Residence (City) | Leroy Twp. |
| 1935 Residence (County) | Audubon |
| Naturalization Status | Naturalized |
| Occupation | Farmer |
| Industry | Farming |
| Class of Worker | OA |
| Hours Worked | 60 |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Iowa |
| Birth Country | Denmark |
| Birthplace (normalized) | denmark |
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 Jensen across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
John Jensen
Head · 1940 · age 54 · b. ~1886 · Iowa
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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 — 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-t0627-01137-00949)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Nick H Jensen | 42 | Head | Farmer | Iowa |
| 2 | Carrie M Jensen | 44 | Wife | — | Illinois |
| 3 | Donald Jensen | 19 | Son | Scholar | Iowa |
| 4 | Earl Jensen | 18 | Son | Farm Hand | Iowa |
| 5 | Elaine Jensen | 11 | Daughter | — | Iowa |
| 6 | Richard Jensen | 29 | Head | Farmer | Iowa |
| 7 | Vanda Jensen | 28 | Wife | — | Iowa |
| 8 | Delbert Jensen | 8 | Son | — | Iowa |
| 9 | Charlot Jensen | 4 | Daughter | — | Iowa |
| 10 | Lang Christiansen | 51 | Head | Farmer | Denmark |
| 11 | Amalie Christiansen | 43 | Wife | — | Iowa |
| 12 | Irving Christiansen | 18 | Son | Farm Hand | Iowa |
| 13 | Sidney Christiansen | 17 | Son | Farm Hand | Iowa |
| 14 | Leona Christiansen | 15 | Daughter | — | Iowa |
| 15 | Dale Christiansen | 13 | Son | — | Iowa |
| 16 | Elaine Christiansen | 11 | Daughter | — | Iowa |
| 17 | Frances Christiansen | 8 | Daughter | — | Iowa |
| 18 | Matt Mathisen | 43 | Head | Farmer | Iowa |
| 19 | Margaret Mathisen | 38 | Wife | — | Iowa |
| 20 | Robert Mathisen | 18 | Son | Farm Hand | Iowa |
| 21 | Irine Mathisen | 14 | Daughter | — | Iowa |
| 22 | Dale Mathisen | 6 | Son | — | Iowa |
| 23 | Alfred Larsen | 43 | Head | Farmer | Iowa |
| 24 | Margaret Larsen | 32 | Wife | — | Iowa |
| 25 | Leon Larsen | 11 | Son | — | Iowa |
| 26 | Ailien Larsen | 7 | Daughter | — | Iowa |
| 27 | Harry Hanse | 21 | Hired man | Farm Hand | Iowa |
| 28 | John Jensen THIS PERSON | 54 | Head | Farmer | Denmark |
| 29 | Bertha Jensen | 54 | Wife | — | Iowa |
| 30 | Theora Jensen | 31 | Daughter | Teacher | Iowa |
| 31 | Leonard Jensen | 29 | Son | Farm Hand | Iowa |
| 32 | Wm Blohm | 58 | Head | Farmer | Illinois |
| 33 | Anna Blohm | 48 | Wife | — | Iowa |
| 34 | Bernice Blohm | 17 | Daughter | Scholar | Iowa |
| 35 | B. A Caldwell | 59 | Head | Farmer | Illinois |
| 36 | Anna E Caldwell | 52 | Wife | — | Iowa |
| 37 | Barbara An Caldwell | 17 | Daughter | — | Iowa |
| 38 | Leo Christiansen | 22 | Hired Hand | Farm Hand | Iowa |
| 39 | Walter Johannsen | 36 | Head | Truck Driver | Iowa |
| 40 | Lois Johannsen | 27 | Wife | — | Colorado |
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)