JH
James Harper — 1940 US Census Record
Model Tree available1940 United States Federal Census · Rock-Island-County, Illinois
Our Model Tree links this James Harper across the 1920, 1930 and 1940 US Censuses in Rock-Island-County, Illinois (XGBoost, ~Confirmed), with identified parents Frank & James — first a son (b.~1918), then head of a 4-person household.
Age 22
b. ~1918
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Rock-Island-County, Illinois |
| Surname | Harper |
| Given Name | James A |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Moline City |
| 1935 Residence (County) | Rock Island |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | C 4 |
| 1935 Residence | Same House |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Moline City |
| Est. Birth Year | ~1918 |
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 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| Emily Harper | Daughter | — | 19 | ~1921 |
| Frank Harper | Head | — | 60 | ~1880 |
| James Harper | Son | — | 22 | ~1918 |
| Lucy Harper | Spouse | — | 52 | ~1888 |
Census Appearances
1920
Rock Island, …
Son, age 2
Rock Island, Illinois · implied b. ~1918 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Harper |
| Given Name | James B. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | none |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Rock Island, …
Son, age 12
Rock Island, Illinois · implied b. ~1918 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Harper |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Rock-Island-County, Illinois
Son, age 22
Rock-Island-County, Illinois · implied b. ~1918 — 4 household members
| Surname | Harper |
| Given Name | James A |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Moline City |
| 1935 Residence (County) | Rock Island |
| Income (1939) | 0 |
| Highest Grade | C 4 |
| 1935 Residence | Same House |
| 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 James Harper across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Frank Harper (~0.92 confidence) and father James Harper (~0.92 confidence) and father J Harper (~0.92 confidence) and mother Lucy Harper (~0.92 confidence) and mother Lucy Harper (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Frank Harper
b. ~1880
Source father
● Household
· direct · ~0.92
Father
James Harper
b. ~1880
Source father
● Household
· direct · ~0.92
Father
J Harper
b. ~1883
Source father
● Household
· direct · ~0.92
Mother
Lucy Harper
b. ~1888
Source mother
● Household
· direct · ~0.92
Mother
Lucy Harper
b. ~1888
Source mother
● Household
· direct · ~0.92
This person
Anchor record
James Harper
Son · 1940 · age 22 · b. ~1918 · Illinois
★ You are viewing this record
Sibling
Emily Harper
Sibling · 1940 · age 19
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 — Rock-Island-County, Illinois
Open full size
1940 US Federal Census — Rock-Island-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00875-00608)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Ina M Dunlap | 58 | Partner | Teacher | Missouri |
| 2 | Charles Linsworth | 35 | Head | Manager | Illinois |
| 3 | Sylvia Linsworth | 34 | Wife | — | Rhode Island |
| 4 | Robert Linsworth | 11 | Son | — | Illinois |
| 5 | Eleanor Linsworth | 9 | Daughter | — | Illinois |
| 6 | Janet Linsworth | 5 | Daughter | — | Illinois |
| 7 | Frank Harper | 60 | Head | Lawyer | Illinois |
| 8 | Lucy Harper | 52 | Wife | — | Illinois |
| 9 | James A Harper THIS PERSON | 22 | Son | — | Illinois |
| 10 | Emily L Harper | 19 | Daughter | — | Illinois |
| 11 | Kenneth Anderson | 30 | Head | Belt Man | Illinois |
| 12 | Mildred Anderson | 31 | Wife | — | Illinois |
| 13 | Bonita Jean Anderson | 9 | Daughter | — | Illinois |
| 14 | Shirley Lee Anderson | 5 | Daughter | — | Illinois |
| 15 | Hilda Tanakson | 73 | Head | — | Sweden |
| 16 | Wilbert Tanakson | 40 | Son | Laborer | Illinois |
| 17 | Ernest Grundstrom | 36 | Head | Moulder | Sweden |
| 18 | Ruby Grundstrom | 27 | Wife | — | Illinois |
| 19 | Virginia Grundstrom | 2 | Daughter | — | Illinois |
| 20 | Russell Wilder | 26 | Head | Painter | Illinois |
| 21 | Isabella Wilder | 20 | Wife | Housework | Belgium |
| 22 | Mary Lou Wilder | 9 | Daughter | — | Illinois |
| 23 | Robert Wilder | 5 | Son | — | Illinois |
| 24 | Betty Jean Wilder | 5 | Daughter | — | Illinois |
| 25 | Joanne Wilder | 4 | Daughter | — | Illinois |
| 26 | Fred Payton | 24 | Head | Machine Operator | Iowa |
| 27 | Ruth Payton | 21 | Wife | — | Illinois |
| 28 | Mary Ruth Payton | 4 | Daughter | — | Illinois |
| 29 | William Payton | 2 | Son | — | Illinois |
| 30 | Ada Blomquist | 69 | Head | — | Sweden |
| 31 | Elmer Blomquist | 49 | Son | — | Illinois |
| 32 | Adolph Effland | 63 | Boarder | Truck Driver | Germany |
| 33 | Chris Post | 50 | Head | Moulder | Greece |
| 34 | Mary Post | 49 | Wife | — | Greece |
| 35 | Louis Post | 21 | Son | Cook | Minnesota |
| 36 | Harold Eddy | 38 | Head | Assembler | Illinois |
| 37 | Aileen Eddy | 37 | Wife | — | Missouri |
| 38 | Rosemary Eddy | 15 | Daughter | — | Illinois |
| 39 | H. Richard Eddy | 13 | Son | — | Illinois |
| 40 | Cadwallader Rose | 68 | Mother-in-law | — | Illinois |
Pedigree Summary
James + 1 sibling
Gen 1 · 5 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)