JO
John Oliver — 1940 US Census Record
Model Tree available1940 United States Federal Census · Audubon-County, Iowa
Our Model Tree links this John Oliver across the 1910, 1920, 1930 and 1940 US Censuses in Audubon-County, Iowa (XGBoost, ~Confirmed), with identified parents Anna & Henry — first a head (b.~1903), then head of a 5-person household.
Age 37
b. ~1903
Male
Head
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Audubon-County, Iowa |
| Surname | Oliver |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 37 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Audubon City |
| 1935 Residence (County) | Audubon |
| Additional Details | |
| Occupation | Laborer |
| Industry | Project Courthouse |
| Class of Worker | GW |
| Hours Worked | 44 |
| Income (1939) | 35 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Laborer |
| Township / Ward | Audubon City |
| Est. Birth Year | ~1903 |
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 |
|---|---|---|---|---|
| Elizabeth Oliver | Daughter | — | 1 | ~1939 |
| Rebecca Oliver | Daughter | — | 7 | ~1933 |
| John Oliver | Head | — | 37 | ~1903 |
| William Oliver | Son | — | 11 | ~1929 |
| Leneda Oliver | Spouse | — | 34 | ~1906 |
Census Appearances
1910
Audubon, Iowa
Son, age 7
Audubon, Iowa · implied b. ~1903 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Oliver |
| Given Name | John H. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Illinois |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1920
Audubon, Iowa
Son, age 16
Audubon, Iowa · implied b. ~1904 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Oliver |
| Given Name | John |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Illinois |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Audubon, Iowa
Head, age 27
Audubon, Iowa · implied b. ~1903 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Oliver |
| Given Name | John H |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Married |
| Birthplace | Iowa |
| Age at First Marriage | 25 |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Illinois |
| Occupation | Trucking agent |
| Industry | Oil station |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 15 |
| Veteran | No |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Audubon-County, Iowa
Head, age 37
Audubon-County, Iowa · implied b. ~1903 — 5 household members
| Surname | Oliver |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 37 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Audubon City |
| 1935 Residence (County) | Audubon |
| Occupation | Laborer |
| Industry | Project Courthouse |
| Class of Worker | GW |
| Hours Worked | 44 |
| Income (1939) | 35 |
| Highest Grade | H 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 John Oliver across 4 US Census years (1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Anna Oliver (~0.92 confidence) and father Henry Oliver (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Anna Oliver
b. ~1878
Source mother
● Household
· direct · ~0.92
Father
Henry Oliver
b. ~1878
Source father
● Household
· direct · ~0.92
This person
Anchor record
John Oliver
Head · 1940 · age 37 · b. ~1903 · 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-t0627-01137-00903)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Haxon, S. Rice | 23 | Head | — | Illinois |
| 2 | Pearl Stanley | 57 | Housekeeper | Housekeeper | Iowa |
| 3 | Lena Kuntzweiler | 57 | Head | — | Denmark |
| 4 | Henry Kuntzweiler | 15 | Son | — | Iowa |
| 5 | Betty Kuntzweiler | 11 | Daughter | — | Iowa |
| 6 | John Oliver THIS PERSON | 37 | Head | Laborer | Iowa |
| 7 | Leneda Oliver | 34 | Wife | — | Iowa |
| 8 | William Oliver | 11 | Son | — | Iowa |
| 9 | Rebecca Oliver | 7 | Daughter | — | Iowa |
| 10 | Elizabeth Oliver | 1 | Daughter | — | Iowa |
| 11 | Peter Berentsen | 58 | Head | Carpenter | Denmark |
| 12 | Tauna Berentsen | 53 | Wife | — | Denmark |
| 13 | Vena Berentsen | 28 | Daughter | — | Iowa |
| 14 | Lily Berentsen | 24 | Daughter | Saleswoman | Iowa |
| 15 | Harry Berentsen | 23 | Son | Farm Worker | Iowa |
| 16 | Janice Berentsen | 21 | Daughter | Breadwrapper | Iowa |
| 17 | Thomas Berentsen | 17 | Son | — | Minnesota |
| 18 | Ming Berentsen | 15 | Daughter | — | Minnesota |
| 19 | Helen Berentsen | 13 | Daughter | — | Iowa |
| 20 | Ken Phelps | 60 | Head | Proprietor | Iowa |
| 21 | Daisy M. Phelps | 55 | Wife | Proprietor | Illinois |
| 22 | Amanda Bagley | 78 | Head | — | Iowa |
| 23 | Harold Sauerman | 43 | Head | Advisor | Iowa |
| 24 | Marjorie Sauerman | 38 | Wife | — | Iowa |
| 25 | James Sauerman | 10 | Son | — | South Dakota |
| 26 | Herbert Mickenkamp | 34 | Head | County Engineer | Iowa |
| 27 | Dorothy Mickenkamp | 30 | Wife | — | Iowa |
| 28 | Harold H. Chalfont | 39 | Head | Commanding Captain | Iowa |
| 29 | Moneta Chalfont | 35 | Wife | — | Iowa |
| 30 | Carl Jensen | 80 | Head | — | Denmark |
| 31 | Hansina Jensen | 79 | Wife | — | Denmark |
| 32 | Thogvald Jensen | 55 | Son | — | Iowa |
| 33 | Esther Jensen | 50 | Daughter-in-law | — | Iowa |
| 34 | William J. Brockway | 66 | Head | Carpenter | Illinois |
| 35 | Rosa M. Brockway | 65 | Wife | — | Iowa |
| 36 | Howard Cavanaugh | 31 | Head | Egg Grader | Iowa |
| 37 | Pearl Cavanaugh | 26 | Wife | — | Iowa |
| 38 | Mona Cavanaugh | 7 | Daughter | — | Iowa |
| 39 | Beverly Cavanaugh | 6 | Daughter | — | Iowa |
| 40 | Shirley M. Cavanaugh | 4 | Daughter | — | Iowa |
Pedigree Summary
John
Gen 1 · 2 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)