JH
John Harper — 1940 US Census Record
Model Tree available1940 United States Federal Census · Scott-County, Iowa
Our Model Tree links this John Harper across the 1920, 1930 and 1940 US Censuses in Scott-County, Iowa (XGBoost, ~Confirmed), with identified parents Thomas & James — first a son (b.~1905), then head of a 3-person household.
Age 35
b. ~1905
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Scott-County, Iowa |
| Surname | Harper |
| Given Name | John C |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Davenport City |
| 1935 Residence (County) | Scott |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | C 2 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Davenport City |
| Est. Birth Year | ~1905 |
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 John | Age | Birth yr |
|---|---|---|---|---|
| Thomas Harper | Head | — | 72 | ~1868 |
| John Harper | Son | — | 35 | ~1905 |
| Blanche Harper | Spouse | — | 62 | ~1878 |
Census Appearances
1920
Scott, Iowa
Son, age 15
Scott, Iowa · implied b. ~1905 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Harper |
| Given Name | John H |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Iowa |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Scott, Iowa
Son, age 25
Scott, Iowa · implied b. ~1905 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Harper |
| Given Name | John C. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Iowa |
| Occupation | Estimator |
| Industry | Plumbing Company |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Scott-County, Iowa
Son, age 35
Scott-County, Iowa · implied b. ~1905 — 3 household members
| Surname | Harper |
| Given Name | John C |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Davenport City |
| 1935 Residence (County) | Scott |
| Income (1939) | 0 |
| Highest Grade | C 2 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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 Harper across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Thomas Harper (~0.92 confidence) and father James Harper (~0.92 confidence) and mother Blanche Harper (~0.92 confidence) and mother Blanche Harper (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Thomas Harper
b. ~1868
Source father
● Household
· direct · ~0.92
Father
James Harper
b. ~1870
Source father
● Household
· direct · ~0.92
Mother
Blanche Harper
b. ~1878
Source mother
● Household
· direct · ~0.92
Mother
Blanche Harper
b. ~1880
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Harper
Son · 1940 · age 35 · b. ~1905 · 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 — Scott-County, Iowa
Open full size
1940 US Federal Census — Scott-County, Iowa
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-01203-00521)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Fred W Johnson | 58 | Son | — | Illinois |
| 2 | Vernice Johnson | 41 | Housekeeper | Housekeeper | Iowa |
| 4 | Mary Jeffries | 77 | Head | — | Illinois |
| 5 | Dr. Ett Keith | 55 | Head | Teacher | Missouri |
| 6 | Webster L Mason | 68 | Brother | Garage | Iowa |
| 7 | Mabel K Mason | 66 | Sister | — | Iowa |
| 8 | Thomas R Harper | 72 | Head | — | Illinois |
| 9 | Blanche Harper | 62 | Wife | — | Iowa |
| 10 | John C Harper THIS PERSON | 35 | Son | — | Illinois |
| 11 | Bert C Frahm | 58 | Head | Manager | Iowa |
| 12 | Marian H Frahm | 59 | Wife | — | Iowa |
| 13 | Helen Waltmire | 34 | Head | Reading Specialist | Illinois |
| 14 | Kathryn Hassett | 42 | Lodger | Stenographer | Iowa |
| 15 | Madeline White | 30 | Lodger | Teacher | Illinois |
| 16 | Don W Cox | 47 | Head | Inspector | Illinois |
| 17 | Edna E Cox | 45 | Wife | — | Illinois |
| 18 | Ruth I Cox | 21 | Daughter | New Worker | Illinois |
| 19 | Charles Lundahl | 58 | Head | Janitor | Connecticut |
| 20 | Dora Lundahl | 58 | Wife | — | Illinois |
| 21 | Carna Lundahl | 29 | Daughter | — | Illinois |
| 22 | Theodore Garrettson | 58 | Lodger | Operator | Iowa |
| 23 | Mae Schriefer | 43 | Lodger | Packer | Iowa |
| 24 | Fayette Jones | 59 | Head | — | Iowa |
| 25 | Agnes M Jones | 70 | Wife | — | Iowa |
| 26 | Ealeie Wallace | 47 | Lodger | Teacher | Iowa |
| 27 | Maggie Mccook | 70 | Lodger | — | Canada |
| 28 | Esther Plumb | 68 | Head | — | Iowa |
| 29 | Bernard Bergquist | 31 | Head | Machinist | Sweden |
| 30 | Dagna Bergquist | 21 | Wife | — | Wisconsin |
| 31 | Dewald Lundstedt | 34 | Lodger | Machinist | Norway |
| 32 | Clark Douglas | 58 | Head | Own Business | Iowa |
| 33 | Sadie Douglas | 52 | Wife | — | Iowa |
| 34 | Amanda Stickney | 80 | Mother-in-law | — | Pennsylvania |
| 35 | John D Barnes | 48 | Head | Doctor | Illinois |
| 36 | Elizabeth E Barnes | 47 | Wife | Doctor | Illinois |
| 37 | Jacqueline Barnes | 10 | Daughter | — | Iowa |
| 38 | Walter J Hill | 54 | Head | — | Texas |
| 39 | Estella R Hill | 48 | Wife | Ironer | Iowa |
| 40 | Virginia Carleton | 70 | Head | — | Iowa |
Pedigree Summary
John
Gen 1 · 4 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)