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Jens Jensen — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Sioux-County, Iowa
Our Model Tree links this Jens Jensen across the 1920, 1930 and 1940 US Censuses in Sioux-County, Iowa (XGBoost, ~Confirmed) — first a head (b.~1875), then head of a 3-person household.
Age 65
b. ~1875
Male
Head
Born: Denmark
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Sioux-County, Iowa |
| Surname | Jensen |
| Given Name | Jens P. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 65 |
| Marital Status | Married |
| Birthplace | Denmark |
| 1935 Residence (City) | Hawarden |
| 1935 Residence (County) | Sioux |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Rail Road Co. |
| Highest Grade | No 4 |
| 1935 Residence | Same place |
| Birth Country | Denmark |
| Birthplace (normalized) | denmark |
| Occupation | Rail Road Co. |
| Township / Ward | Hawarden |
| Est. Birth Year | ~1875 |
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 |
|---|---|---|---|---|
| Anna Jensen | Spouse | — | 69 | ~1871 |
| Minnie Jensen | Daughter | — | 36 | ~1904 |
| Jens Jensen | Head | — | 65 | ~1875 |
Census Appearances
1920
Sioux, Iowa
Head, age 45
Sioux, Iowa · implied b. ~1875 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jensen |
| Given Name | Jens P. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 45 |
| Marital Status | Married |
| Birthplace | Denmark |
| Year of Immigration | 1908 |
| Naturalization Status | First papers filed |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Denmark |
| Occupation | Car Repairer |
| Industry | Railway Co. |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Danish |
| Home Owned/Rented | O |
| Home Free/Mortgaged | M |
| Birth Country | Denmark |
| Birthplace (normalized) | denmark |
1930
Sioux, Iowa
Head, age 56
Sioux, Iowa · implied b. ~1874 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jensen |
| Given Name | Jens P. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 56 |
| Marital Status | Married |
| Birthplace | Denmark |
| Naturalization Status | Naturalized |
| Year of Immigration | 1910 |
| Age at First Marriage | 26 |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Denmark |
| Occupation | laborer |
| Industry | steam railroad |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | Danish |
| Home Owned/Rented | O |
| Home Value / Rent | 1100 |
| Veteran | No |
| Birth Country | Denmark |
| Birthplace (normalized) | denmark |
1940
Sioux-County, Iowa
Head, age 65
Sioux-County, Iowa · implied b. ~1875 — 3 household members
| Surname | Jensen |
| Given Name | Jens P. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 65 |
| Marital Status | Married |
| Birthplace | Denmark |
| 1935 Residence (City) | Hawarden |
| 1935 Residence (County) | Sioux |
| Naturalization Status | Naturalized |
| Occupation | Rail Road Co. |
| Highest Grade | No 4 |
| 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 Jens 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
Jens Jensen
Head · 1940 · age 65 · b. ~1875 · 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 — Sioux-County, Iowa
Open full size
1940 US Federal Census — Sioux-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01205-00071)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Frank Evans | 35 | Head | Grain Buyer | Iowa |
| 42 | Amanda Evans | 34 | Wife | — | Iowa |
| 43 | Milo Evans | 13 | Son | — | Iowa |
| 44 | Lowell Evans | 9 | Son | — | Iowa |
| 45 | Neva Jean Evans | 4 | Daughter | — | Iowa |
| 46 | Dora Sambertson | 32 | Head | Seamstress | So. Dak. |
| 47 | Hattie Mae Sambertson | 13 | Daughter | — | So. Dak. |
| 48 | Dorothy Jean Sambertson | 12 | Daughter | — | So. Dak. |
| 49 | Mary Jean Sambertson | 8 | Daughter | — | So. Dak. |
| 50 | Harry Allen Sambertson | 6 | Son | — | So. Dak. |
| 51 | Arthur Elmitt | 37 | Head | Bridge Carpenter | Iowa |
| 52 | Mildred Elmitt | 39 | Wife | — | Iowa |
| 53 | Joy Elmitt | 7 | Daughter | — | Iowa |
| 54 | Ruby Ann Elmitt | 6 | Daughter | — | Iowa |
| 55 | Betty Richardson | 67 | Head | House-Wife | Iowa |
| 56 | William J. Elmitt | 53 | Head | Machinist | So. Dak. |
| 57 | Alta Elmitt | 57 | Wife | — | Ill. |
| 58 | William H. Elmitt | 21 | Son | Common Laborer | Iowa |
| 59 | Frank Bellwood | 56 | Head | Meat Cutter | Conn. |
| 60 | Florence Bellwood | 55 | Wife | — | Oregon |
| 61 | Marian Bellwood | 19 | Daughter | Teacher | Iowa |
| 62 | Wesley Bellwood | 16 | Son | — | Iowa |
| 63 | Sherman Knappa | 73 | Head | — | Iowa |
| 64 | Lilly Knappa | 66 | Wife | — | Iowa |
| 65 | James Knappa | 30 | Son | Common Laborer | Iowa |
| 66 | William Murphy | 34 | Son-in-law | Common Laborer | So. Dak. |
| 67 | Mildred Murphy | 25 | Daughter | — | Iowa |
| 68 | Alta Mae Murphy | 8 | Grandchild | — | Iowa |
| 69 | Agnes Murphy | 6 | Grandchild | — | Iowa |
| 70 | Paul Murphy | 4 | Grandchild | — | Iowa |
| 71 | Jens P. Jensen THIS PERSON | 65 | Head | Rail Road Co. | Denmark |
| 72 | Anna Jensen | 69 | Wife | — | Denmark |
| 73 | Minnie Jensen | 36 | Daughter | Teacher - School | Denmark |
| 74 | Earl Bray | 42 | Head | Barber | Iowa |
| 75 | Nora Bray | 39 | Wife | — | West Virginia |
| 76 | Betty Jean Bray | 18 | Daughter | — | Iowa |
| 77 | Robert Bray | 16 | Son | — | Iowa |
| 78 | Willis Bray | 15 | Son | — | Iowa |
| 79 | Ralph M. Williams | 53 | Father-in-law | Registered Pharmacist | Iowa |
| 80 | Blanche Williams | 44 | Mother-in-law | — | 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)