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John Jensen — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Humboldt-County, Iowa
Our Model Tree links this John Jensen across the 1920, 1930 and 1940 US Censuses in Humboldt-County, Iowa (XGBoost, ~Confirmed) — first a head (b.~1876), then head of a 5-person household.
Age 64
b. ~1876
Male
Head
Born: Denmark
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Humboldt-County, Iowa |
| Surname | Jensen |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 64 |
| Marital Status | Married |
| Birthplace | Denmark |
| 1935 Residence (City) | Rutland Twp. |
| 1935 Residence (County) | Humboldt |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 40 |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth Country | Denmark |
| Birthplace (normalized) | denmark |
| Occupation | Farmer |
| Township / Ward | Rutland Twp |
| Est. Birth Year | ~1876 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Evelyn Jensen | Daughter | — | 23 | ~1917 |
| Doris Jensen | Daughter | — | 16 | ~1924 |
| John Jensen | Head | — | 64 | ~1876 |
| Leonard Jensen | Son | — | 21 | ~1919 |
| Anna Jensen | Spouse | — | 57 | ~1883 |
Census Appearances
1920
Audubon, Iowa
Head, age 41
Audubon, Iowa · implied b. ~1879 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jensen |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 41 |
| Marital Status | Married |
| Birthplace | Denmark |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Denmark |
| Occupation | Farmer |
| Industry | Own farm |
| Class of Worker | Emp |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Danish |
| Home Owned/Rented | O |
| Home Free/Mortgaged | F |
| Birth Country | Denmark |
| Year of Naturalization | 1906 |
| Birthplace (normalized) | denmark |
1930
Humboldt, Iowa
Head, age 51
Humboldt, Iowa · implied b. ~1879 — 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 | 51 |
| Marital Status | Married |
| Birthplace | Denmark |
| Naturalization Status | Naturalized |
| Year of Immigration | 1901 |
| Age at First Marriage | 25 |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Denmark |
| Occupation | Farmer |
| Industry | General farm |
| Class of Worker | OA |
| Can Read/Write | Yes |
| Mother Tongue | Danish |
| Home Owned/Rented | R |
| Radio Set | R |
| Veteran | No |
| Birth Country | Denmark |
| Birthplace (normalized) | denmark |
1940
Humboldt-County, Iowa
Head, age 64
Humboldt-County, Iowa · implied b. ~1876 — 5 household members
| Surname | Jensen |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 64 |
| Marital Status | Married |
| Birthplace | Denmark |
| 1935 Residence (City) | Rutland Twp. |
| 1935 Residence (County) | Humboldt |
| Naturalization Status | Naturalized |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 40 |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| 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 3 locations, using XGBoost record linkage.
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This person
Anchor record
John Jensen
Head · 1940 · age 64 · b. ~1876 · 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 — Humboldt-County, Iowa
Open full size
1940 US Federal Census — Humboldt-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01167-00674)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Burton Crane | 18 | Son | Farm Hand | Iowa |
| 42 | Michael Gregerson | 69 | Head | Retired Farmer | Denmark |
| 43 | Marion Gregerson | 71 | Wife | — | Denmark |
| 44 | Arthur Jensen | 34 | Head | Farmer | Iowa |
| 45 | Roberta Jensen | 29 | Wife | — | Iowa |
| 46 | George Jensen | 2 | Son | — | Iowa |
| 47 | Mylo Jensen | 27 | Brother | Farm Hand | Iowa |
| 48 | Melvin Jacobson | 44 | Head | Farmer | Iowa |
| 49 | Emma Jacobson | 46 | Wife | — | Iowa |
| 50 | Marian Jacobson | 21 | Daughter | School Teacher | Iowa |
| 51 | Robert Parry | 28 | Hired man | Farm Hand | Iowa |
| 52 | John P. Hanson | 54 | Head | Farmer | Illinois |
| 53 | Olga Mary Hanson | 51 | Wife | — | Iowa |
| 54 | Maurice Juhl | 28 | Head | Farmer | Iowa |
| 55 | Marguerit Juhl | 22 | Wife | — | Iowa |
| 56 | Louis Juhl | 1 | Son | — | Iowa |
| 57 | Matt H. Show | 58 | Head | Farmer | Illinois |
| 58 | Sunie Show | 59 | Wife | — | Iowa |
| 59 | James Show | 25 | Head | Farm Hand | Iowa |
| 60 | Esther Show | 25 | Wife | — | Illinois |
| 61 | Janetta Show | 4 | Daughter | — | Iowa |
| 62 | Juane Show | 0 | Daughter | — | Iowa |
| 63 | Anton J. Skoog | 56 | Head | Farmer | Iowa |
| 64 | Emma E. Skoog | 54 | Wife | — | Iowa |
| 65 | John Jensen THIS PERSON | 64 | Head | Farmer | Denmark |
| 66 | Anna M. Jensen | 57 | Wife | — | Iowa |
| 67 | Evelyn Jensen | 23 | Daughter | — | Iowa |
| 68 | Leonard Jensen | 21 | Son | — | Iowa |
| 69 | Doris Jensen | 16 | Daughter | — | Iowa |
| 70 | Emery Cook | 26 | Head | Farmer | Iowa |
| 71 | Cleo Cook | 21 | Wife | — | Iowa |
| 72 | Kay L. Cook | 0 | Daughter | — | Iowa |
| 73 | Carl Olsen | 29 | Head | Farm Hand | Iowa |
| 74 | Lucille Olsen | 27 | Wife | — | Iowa |
| 75 | Eugene A. Olsen | 3 | Son | — | Iowa |
| 76 | Carol Louise Olsen | 1 | Daughter | — | Iowa |
| 77 | Walter Jensen | 48 | Head | Farmer | Iowa |
| 78 | Johanna Jensen | 46 | Wife | — | Iowa |
| 79 | Don H. Jensen | 10 | Son | — | Iowa |
| 80 | Alma Olson | 44 | Hired Girl | Hired Girl | Iowa |
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)