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Robert Jensen — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cerro-Gordo-County, Iowa
Our Model Tree links this Robert Jensen across the 1930 and 1940 US Censuses in Cerro-Gordo-County, Iowa (XGBoost, ~Confirmed) — first a son (b.~1923), then head of a 7-person household.
Age 17
b. ~1923
Male
Son
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cerro-Gordo-County, Iowa |
| Surname | Jensen |
| Given Name | Robert C. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Clear Lake City |
| 1935 Residence (County) | Cerro Gordo |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | H-3 |
| 1935 Residence | Same house |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Clear Lake City |
| Est. Birth Year | ~1923 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Robert | Age | Birth yr |
|---|---|---|---|---|
| Ruth Jensen | Daughter | — | 16 | ~1924 |
| Jens Jensen | Head | — | 49 | ~1891 |
| Katherine Jensen | Spouse | — | 43 | ~1897 |
| Warren Jensen | Son | — | 18 | ~1922 |
| Robert Jensen | Son | — | 17 | ~1923 |
| Roger Jensen | Son | — | 13 | ~1927 |
| Doris Jensen | Daughter | — | 20 | ~1920 |
Census Appearances
1930
Cerro Gordo, …
Son, age 7
Cerro Gordo, Iowa · implied b. ~1923 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jensen |
| Given Name | Robert E. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Denmark |
| Occupation | none |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Cerro-Gordo-County, Iowa
Son, age 17
Cerro-Gordo-County, Iowa · implied b. ~1923 — 7 household members
| Surname | Jensen |
| Given Name | Robert C. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Clear Lake City |
| 1935 Residence (County) | Cerro Gordo |
| Income (1939) | 0 |
| Highest Grade | H-3 |
| 1935 Residence | Same house |
| 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 Robert Jensen across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Robert Jensen
Son · 1940 · age 17 · b. ~1923 · Iowa
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Sibling
Doris Jensen
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ruth Jensen
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Warren Jensen
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Roger Jensen
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Cerro-Gordo-County, Iowa
Open full size
1940 US Federal Census — Cerro-Gordo-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01146-00146)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Frederick G. Opel | 29 | Head | Traveling Salesman | Iowa |
| 2 | M. Evelyn L.D. Opel | 25 | Wife | — | Iowa |
| 3 | Virgil M. Vawter | 67 | Head | Messenger | Iowa |
| 4 | Virginia J. O. Vawter | 64 | Wife | — | Iowa |
| 5 | Archie D. Nelson | 11 | Lodger | — | Sweden |
| 6 | A. C. Koenig | 47 | Head | Cheesemaker | N. Dakota |
| 7 | Ethel L. D. Koenig | 38 | Wife | — | Iowa |
| 8 | Mary Elaine Koenig | 4 | Daughter | — | Iowa |
| 9 | Leland E. Patterson | 55 | Head | Proprietor | Nebraska |
| 10 | Jessie G. Patterson | 50 | Wife | — | Iowa |
| 11 | Isabelle G. Patterson | 23 | Daughter | School Teacher | Iowa |
| 12 | Jens P. D. Jensen | 49 | Head | Manager | Denmark |
| 13 | Katherine M. Jensen | 43 | Wife | — | Denmark |
| 14 | Doris S. Jensen | 20 | Daughter | — | Iowa |
| 15 | Warren L. Jensen | 18 | Son | — | Iowa |
| 16 | Robert C. Jensen THIS PERSON | 17 | Son | — | Iowa |
| 17 | Ruth E. Jensen | 16 | Daughter | — | Iowa |
| 18 | Roger A. Jensen | 13 | Son | — | Iowa |
| 19 | Chauncey Merwin | 50 | Head | Evangelist | S. Dakota |
| 20 | Alice Merwin | 49 | Wife | — | Iowa |
| 21 | Helen M. Merwin | 24 | Daughter | Clerk | Texas |
| 22 | Alma K. Merwin | 21 | Daughter | Clerk | Texas |
| 23 | Alice J. Merwin | 19 | Daughter | — | Texas |
| 24 | Lillian R. Merwin | 18 | Daughter | — | Texas |
| 25 | James C. Merwin | 16 | Son | — | Texas |
| 26 | Doris E. Merwin | 14 | Daughter | — | Texas |
| 27 | Ralph E. Merwin | 12 | Son | — | Texas |
| 28 | Carol Mae Merwin | 10 | Daughter | — | Texas |
| 29 | Althea F. Merwin | 9 | Daughter | — | Texas |
| 30 | David Merwin | 8 | Son | — | Iowa |
| 31 | Sara Merwin | 6 | Daughter | — | Iowa |
| 32 | Paul Merwin | 5 | Son | — | Iowa |
| 33 | Pauline Merwin | 2 | Daughter | — | Iowa |
| 34 | Albert Hanna | 64 | Head | Laborer | Indiana |
| 35 | Anna (X) Hanna | 52 | Wife | Housekeeper | Indiana |
| 36 | Storey Hanna | 38 | Son | Laborer | Indiana |
| 37 | Thorlie Hanna | 33 | Son | Laborer | Indiana |
| 38 | Raymond Hanna | 20 | Son | — | Iowa |
| 39 | Charles F. Ransom | 69 | Head | Road Commissioner | Maryland |
| 40 | Elmira L. D. Ransom | 64 | Wife | — | 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)