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Jens Jensen — 1940 US Census Record
Model Tree available1940 United States Federal Census · Audubon-County, Iowa
Our Model Tree links this Jens Jensen across the 1920, 1930 and 1940 US Censuses in Audubon-County, Iowa (XGBoost, ~Confirmed), with identified parents Claus & Jens — first a son (b.~1907), then head of a 3-person household.
Age 33
b. ~1907
Male
Son
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Audubon-County, Iowa |
| Surname | Jensen |
| Given Name | Jens C |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 33 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Exira town |
| 1935 Residence (County) | Audubon |
| Additional Details | |
| Occupation | Of third hand |
| Industry | Farm |
| Class of Worker | PW |
| Income (1939) | 80 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Of Third Hand |
| Township / Ward | Exira Town |
| Est. Birth Year | ~1907 |
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 Jens | Age | Birth yr |
|---|---|---|---|---|
| Jens Jensen | Head | — | 67 | ~1873 |
| Anna Jensen | Spouse | — | 60 | ~1880 |
| Jens Jensen | Son | — | 33 | ~1907 |
Census Appearances
1920
Audubon, Iowa
Son, age 14
Audubon, Iowa · implied b. ~1906 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jensen |
| Given Name | Jens |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Denmark |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Audubon, Iowa
Son, age 23
Audubon, Iowa · implied b. ~1907 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jensen |
| Given Name | Jens C |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Denmark |
| Occupation | Laborer |
| Industry | Highway |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Audubon-County, Iowa
Son, age 33
Audubon-County, Iowa · implied b. ~1907 — 3 household members
| Surname | Jensen |
| Given Name | Jens C |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 33 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Exira town |
| 1935 Residence (County) | Audubon |
| Occupation | Of third hand |
| Industry | Farm |
| Class of Worker | PW |
| Income (1939) | 80 |
| Highest Grade | Hs 4 |
| 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 Jens Jensen across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Claus Jensen (~0.92 confidence) and father Jens Jensen (~0.92 confidence) and father Jens Jensen (~0.92 confidence) and mother Anna Jensen (~0.92 confidence) and mother Anna Jensen (~0.92 confidence) and mother Anna Jensen (~0.92 confidence). The pedigree spans 1 generation with 6 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Claus Jensen
b. ~1870
Source father
● Household
· direct · ~0.92
Father
Jens Jensen
b. ~1873
Source father
● Household
· direct · ~0.92
Father
Jens Jensen
b. ~1873
Source father
● Household
· direct · ~0.92
Mother
Anna Jensen
b. ~1870
Source mother
● Household
· direct · ~0.92
Mother
Anna Jensen
b. ~1880
Source mother
● Household
· direct · ~0.92
Mother
Anna Jensen
b. ~1880
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Jens Jensen
Son · 1940 · age 33 · b. ~1907 · 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-t0627-01137-00816)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Robert Chase | 5 | son | — | Iowa |
| 42 | Raymond Chase | 5 | son | — | Iowa |
| 43 | Jerry Chase | 0 | son | — | Iowa |
| 44 | Carl Mcclain | 31 | head | Hauling | Washington |
| 45 | Louise Q Mcclain | 32 | wife | Flower Maker | Iowa |
| 46 | Rose Marie Mcclain | 5 | daughter | — | Iowa |
| 47 | Dale Mcclain | 3 | son | — | Iowa |
| 48 | Guy Mcclain | 28 | head | Loader | Iowa |
| 49 | Idalee A Mcclain | 24 | wife | — | Iowa |
| 50 | Peggy J Mcclain | 2 | daughter | — | Iowa |
| 51 | Peter C Kirk | 50 | head | Painter | Denmark |
| 52 | Lillie Q Kirk | 48 | wife | — | Iowa |
| 53 | Palmer Kirk | 19 | son | Painting | Iowa |
| 54 | Harvey Kirk | 18 | son | Painter | Iowa |
| 55 | Elena Kirk | 17 | daughter | Waitress | Iowa |
| 56 | Leland Kirk | 15 | son | — | Iowa |
| 57 | Norman Kirk | 13 | son | — | Iowa |
| 58 | Margaret Kirk | 7 | daughter | — | Iowa |
| 59 | Aug A Chase | 42 | head | Laborer | Iowa |
| 60 | Jens P Q Jensen | 67 | head | Night Watch | Denmark |
| 61 | Anna Marie Jensen | 60 | wife | — | Denmark |
| 62 | Jens C Jensen THIS PERSON | 33 | son | Of Third Hand | Iowa |
| 63 | Kermit Fredericksen | 30 | head | Salesman | Iowa |
| 64 | Elloween A Fredericksen | 29 | wife | — | Iowa |
| 65 | Mary Arlene Fredericksen | 5 | daughter | — | Iowa |
| 66 | Merland K Fredericksen | 3 | son | — | Iowa |
| 67 | M. C. Simonsen | 66 | head | Retired | Denmark |
| 68 | Hannah A Simonsen | 56 | wife | — | Denmark |
| 69 | Annette Simonsen | 24 | daughter | Housework | Iowa |
| 70 | Carl Simonsen | 18 | son | Attendant | Iowa |
| 71 | Virginia Simonsen | 15 | daughter | — | Iowa |
| 72 | Clarence Simonsen | 13 | son | — | Iowa |
| 73 | Richard E Davis | 59 | head | Tractor Driver | Iowa |
| 74 | Emma Q Davis | 53 | wife | — | Iowa |
| 75 | Sanford H Davis | 26 | son | Corn Sheller | Iowa |
| 76 | Corvin H Davis | 14 | son | — | Iowa |
| 77 | Chaley W Adair | 56 | head | Farmer | Iowa |
| 78 | Bertha A Adair | 52 | wife | — | Iowa |
| 79 | Florence Adair | 32 | daughter | Teacher | Iowa |
| 80 | Maxine Adair | 27 | daughter | Teacher | Iowa |
Pedigree Summary
Jens
Gen 1 · 6 parents
~0.92
Max depth 4 (1900–1950 window)
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)