HP
Harold Peterson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Rock-Island-County, Illinois
Our Model Tree links this Harold Peterson across the 1920, 1930 and 1940 US Censuses in Rock-Island-County, Illinois (XGBoost, ~Confirmed), with identified parents Gust & Gust — first a son (b.~1911), then head of a 5-person household.
Age 29
b. ~1911
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Rock-Island-County, Illinois |
| Surname | Peterson |
| Given Name | Harold |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Moline City |
| 1935 Residence (County) | Rock Island |
| Additional Details | |
| Occupation | Clerk |
| Industry | Food Dealer |
| Class of Worker | PW |
| Hours Worked | 54 |
| Income (1939) | 1200 |
| Highest Grade | H 2 |
| 1935 Residence | Same house |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Clerk |
| Township / Ward | Moline City |
| Est. Birth Year | ~1911 |
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 Harold | Age | Birth yr |
|---|---|---|---|---|
| Margaret Peterson | Daughter | — | 27 | ~1913 |
| Alfred Peterson | Head | — | 55 | ~1885 |
| Freda Peterson | Spouse | — | 51 | ~1889 |
| Harold Peterson | Son | — | 29 | ~1911 |
| Carl Peterson | Son | — | 24 | ~1916 |
Census Appearances
1920
Rock Island, …
Son, age 7
Rock Island, Illinois · implied b. ~1913 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Peterson |
| Given Name | Harold |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Mother Tongue | Swedish |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Rock Island, …
Son, age 18
Rock Island, Illinois · implied b. ~1912 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Peterson |
| Given Name | Harold E. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | Core maker |
| Industry | Farm Impl. Factory |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Rock-Island-County, Illinois
Son, age 29
Rock-Island-County, Illinois · implied b. ~1911 — 5 household members
| Surname | Peterson |
| Given Name | Harold |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Moline City |
| 1935 Residence (County) | Rock Island |
| Occupation | Clerk |
| Industry | Food Dealer |
| Class of Worker | PW |
| Hours Worked | 54 |
| Income (1939) | 1200 |
| Highest Grade | H 2 |
| 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 Harold Peterson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Gust Peterson (~0.92 confidence) and father Gust Peterson (~0.92 confidence) and mother Manda Peterson (~0.92 confidence) and mother Maud Peterson (~0.92 confidence) and father Alfred Peterson (~0.92 confidence) and mother Freda Peterson (~0.92 confidence). The pedigree spans 1 generation with 6 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Gust Peterson
b. ~1874
Source father
● Household
· direct · ~0.92
Father
Gust Peterson
b. ~1875
Source father
● Household
· direct · ~0.92
Mother
Manda Peterson
b. ~1877
Source mother
● Household
· direct · ~0.92
Mother
Maud Peterson
b. ~1878
Source mother
● Household
· direct · ~0.92
Father
Alfred Peterson
b. ~1885
Source father
● Household
· direct · ~0.92
Mother
Freda Peterson
b. ~1889
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Harold Peterson
Son · 1940 · age 29 · b. ~1911 · Illinois
★ You are viewing this record
Sibling
Margaret Peterson
Sibling · 1940 · age 27
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Carl Peterson
Sibling · 1940 · age 24
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-t0627-00875-00981)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Dorothy Strandlund | 4 | Daughter | — | Illinois |
| 2 | Herbert Sellers | 31 | Head | Sheet Metal Layout | Illinois |
| 3 | Mildred Sellers | 31 | Wife | — | Illinois |
| 4 | Sharon Sellers | 1 | Daughter | — | Illinois |
| 5 | Lyle Lockhart | 28 | Head | Machinist | Illinois |
| 6 | Mary Jane Lockhart | 22 | Wife | — | Illinois |
| 7 | James Lockhart | 2 | Son | — | Illinois |
| 8 | Jerry Lockhart | 1 | Son | — | Illinois |
| 9 | Joseph Depperman | 33 | Head | Assembling | Iowa |
| 10 | Edna Depperman | 36 | Wife | — | Illinois |
| 11 | Billy Depperman | 14 | Son | — | Iowa |
| 12 | Mary Lou Depperman | 12 | Daughter | — | Iowa |
| 13 | Doris Depperman | 5 | Daughter | — | Iowa |
| 14 | Perry Palmer | 51 | Head | Laborer | Illinois |
| 15 | Jennie Palmer | 46 | Wife | — | Illinois |
| 16 | Louis Palmer | 19 | Son | Laborer | Illinois |
| 17 | Robert Palmer | 17 | Son | Laborer | Illinois |
| 18 | Patricia Palmer | 14 | Daughter | — | Illinois |
| 19 | John Palmer | 84 | Father | — | Pennsylvania |
| 20 | Harry Fulacher | 43 | Head | — | Illinois |
| 21 | Julia Fulacher | 44 | Wife | Waitress | Illinois |
| 22 | Harriet Fulacher | 19 | Daughter | Waitress | Illinois |
| 23 | Robert J. Carlson | 44 | Head | Paper Cutter | Illinois |
| 24 | Jessie A. Carlson | 39 | Wife | — | Illinois |
| 25 | Phyllis Carlson | 14 | Daughter | — | Illinois |
| 26 | Charles Johnson | 41 | Head | Attendant | Illinois |
| 27 | Mabel Johnson | 39 | Wife | — | Illinois |
| 28 | George Fulacher | 34 | Head | Drying Man | Illinois |
| 29 | Rose Ellen Fulacher | 28 | Wife | — | Iowa |
| 30 | Frank Drafchinski | 53 | Head | Polisher | Poland |
| 31 | Elizabeth Drafchinski | 58 | Wife | — | Illinois |
| 32 | Clarence Drafchinski | 28 | Son | Buffer | Illinois |
| 33 | Alfred Peterson | 55 | Head | Sheet Metal Worker | Sweden |
| 34 | Freda Peterson | 51 | Wife | — | Sweden |
| 35 | Harold Peterson THIS PERSON | 29 | Son | Clerk | Illinois |
| 36 | Margaret Peterson | 27 | Daughter | Clerk | Illinois |
| 37 | Carl Peterson | 24 | Son | — | Illinois |
| 38 | Harry Ehrhardt | 48 | Head | Packer | Missouri |
| 39 | Laura Ehrhardt | 41 | Wife | — | Illinois |
| 40 | Lawrence Ehrhardt | 12 | Son | — | Illinois |
Pedigree Summary
Harold + 2 siblings
Gen 1 · 6 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)