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John Jensen — 1930 US Census Record
Model Tree available1930 United States Federal Census · Polk, Iowa
Our Model Tree links this John Jensen across the 1920, 1930 and 1940 US Censuses in Polk, Iowa (XGBoost, ~Confirmed), with identified parents Louis & Ludvig — first a son (b.~1889), then head of a 4-person household.
Age 41
b. ~1889
Male
Son
Born: Iowa
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Polk, Iowa |
| Surname | Jensen |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 41 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Denmark |
| Additional Details | |
| Occupation | Machinist |
| Industry | Machine Shop |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Machinist |
| Township / Ward | Des Moines City |
| Est. Birth Year | ~1889 |
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 1930 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Louis Jensen | Head | — | 79 | ~1851 |
| Evaline Jensen | Other | — | 75 | ~1855 |
| Charlie Jensen | Son | — | 43 | ~1887 |
| John Jensen | Son | — | 41 | ~1889 |
Census Appearances
1920
Polk, Iowa
Son, age 30
Polk, Iowa · implied b. ~1890 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jensen |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Denmark |
| Occupation | Mechanic |
| Industry | Oil Company |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Danish |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Polk, Iowa
Son, age 41
Polk, Iowa · implied b. ~1889 — 4 household members
| Surname | Jensen |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 41 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Denmark |
| Occupation | Machinist |
| Industry | Machine Shop |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Polk-County, Iowa
Head, age 53
Polk-County, Iowa · implied b. ~1887 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jansen |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 53 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Des Moines City |
| 1935 Residence (County) | Polk |
| Occupation | Car Repairing |
| Industry | Railroad |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 1500 |
| Highest Grade | 7 |
| 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 John Jensen across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Louis Jensen (~0.92 confidence) and father Ludvig Jensen (~0.92 confidence) and mother Lena Jensen (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Louis Jensen
b. ~1851
Source father
● Household
· direct · ~0.92
Father
Ludvig Jensen
b. ~1851
Source father
● Household
· direct · ~0.92
Mother
Lena Jensen
b. ~1855
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Jensen
Son · 1930 · age 41 · b. ~1889 · Iowa
★ You are viewing this record
Sibling
Charlie Jensen
Sibling · 1930 · age 43
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
1930 US Federal Census — Polk, Iowa
Open full size
1930 US Federal Census — Polk, Iowa
Page Contents
20 people indexed on this census page (ia:1930:iowacensus00reel674:0237)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Michael Dromey | 67 | Head | — | Illinois |
| 2 | Mary E. Dromey | 57 | Wife-H | — | Iowa |
| 3 | Fred G. Drumm | 40 | Head | Salesman | Nebraska |
| 4 | Annie E. Drumm | 30 | Wife-H | — | Nebraska |
| 5 | Ella D. Drumm | 1 | Daughter | — | Nebraska |
| 6 | Frank W. Schey | 39 | Head | Piano Tuner | Illinois |
| 7 | Melissa J. Schey | 29 | Wife-H | — | Iowa |
| 8 | Juanita Thomas | 9 | Boarder | — | Iowa |
| 9 | Richard Thomas | 6 | Boarder | — | Iowa |
| 10 | Elmer E. Stubbs | 44 | Head | Truck Driver | Iowa |
| 11 | Elmer Jr. Stubbs | 15 | Son | — | New York |
| 12 | Genieve Stubbs | 12 | Daughter | — | New York |
| 13 | Alice D. Stubbs | 65 | Sister-H | Teacher | United States |
| 14 | Carrie Leonard | 52 | Servant | Servant | Iowa |
| 15 | Charles W. Slye | 24 | Head | Advertising Manager | Iowa |
| 16 | Marjory M. Slye | 24 | Wife-H | Stenographer | Iowa |
| 17 | Louis Jensen | 79 | Head | Farming | Denmark |
| 18 | Evaline A. Jensen | 75 | Wife-H | — | Denmark |
| 19 | Charlie Jensen | 43 | Son | Mechanic | Iowa |
| 20 | John Jensen THIS PERSON | 41 | Son | Machinist | Iowa |
Pedigree Summary
John + 1 sibling
Gen 1 · 3 parents
~0.92
Max depth 4 (1900–1950 window)
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)