HW
Harold Williams — 1940 US Census Record
Model Tree available1940 United States Federal Census · Rock-Island-County, Illinois
Our Model Tree links this Harold Williams across the 1920, 1930 and 1940 US Censuses in Rock-Island-County, Illinois (XGBoost, ~Confirmed), with identified parents Roscoe & Elizabeth — first a son (b.~1916), then head of a 4-person household.
Age 24
b. ~1916
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Rock-Island-County, Illinois |
| Surname | Williams |
| Given Name | Harold |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Moline City |
| 1935 Residence (County) | Rock Island |
| Additional Details | |
| Occupation | Bookkeeper |
| Industry | Bank |
| Class of Worker | PW |
| Hours Worked | 42 |
| Income (1939) | 800 |
| Highest Grade | C 2 |
| 1935 Residence | Same house |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Bookkeeper |
| Township / Ward | Moline City |
| Est. Birth Year | ~1916 |
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 Harold | Age | Birth yr |
|---|---|---|---|---|
| Ada Williams | Daughter | — | 34 | ~1906 |
| Roscoe Williams | Head | — | 57 | ~1883 |
| Harold Williams | Son | — | 24 | ~1916 |
| Elizabeth Williams | Spouse | — | 56 | ~1884 |
Census Appearances
1920
Rock Island, …
Son, age 3
Rock Island, Illinois · implied b. ~1917 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Williams |
| Given Name | Harold |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Rock Island, …
Son, age 14
Rock Island, Illinois · implied b. ~1916 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Williams |
| Given Name | Harold G |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| 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 24
Rock-Island-County, Illinois · implied b. ~1916 — 4 household members
| Surname | Williams |
| Given Name | Harold |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Moline City |
| 1935 Residence (County) | Rock Island |
| Occupation | Bookkeeper |
| Industry | Bank |
| Class of Worker | PW |
| Hours Worked | 42 |
| Income (1939) | 800 |
| Highest Grade | C 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 Williams across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Roscoe Williams (~0.92 confidence) and mother Elizabeth Williams (~0.92 confidence) and father Fred Williams (~0.92 confidence) and mother Louise Williams (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Roscoe Williams
b. ~1883
Source father
● Household
· direct · ~0.92
Mother
Elizabeth Williams
b. ~1884
Source mother
● Household
· direct · ~0.92
Father
Fred Williams
b. ~1891
Source father
● Household
· direct · ~0.92
Mother
Louise Williams
b. ~1892
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Harold Williams
Son · 1940 · age 24 · b. ~1916 · Illinois
★ You are viewing this record
Sibling
Ada Williams
Sibling · 1940 · age 34
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-t0627-00875-00388)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | William Henry Humphrey | 7 | Son | — | Illinois |
| 2 | Gerald Humphrey | 5 | Son | — | Illinois |
| 3 | Sharon Humphrey | 2 | Daughter | — | Illinois |
| 4 | Clyde P. Roberts | 44 | Head | Printer | Tennessee |
| 5 | Ethel Roberts | 45 | Wife | — | Illinois |
| 6 | Elaine Roberts | 20 | Daughter | New Worker | Illinois |
| 7 | Doris Mae Roberts | 17 | Daughter | — | Illinois |
| 8 | Benjamin Roberts | 11 | Son | — | Illinois |
| 9 | Roland Kreider | 46 | Head | Salesman | Iowa |
| 10 | Rosalie Kreider | 36 | Wife | — | Missouri |
| 11 | Phill Rogers | 46 | Head | Painter | Belgium |
| 12 | Rosalie Rogers | 43 | Wife | — | Belgium |
| 13 | Roscoe Williams | 57 | Head | Poultry Cook | Illinois |
| 14 | Elizabeth Williams | 56 | Wife | Manager | Illinois |
| 15 | Ada Mae Williams | 34 | Daughter | Secretary | Illinois |
| 16 | Harold Williams THIS PERSON | 24 | Son | Bookkeeper | Illinois |
| 17 | Iager Forsberg | 34 | Head | Assembler | Sweden |
| 18 | Viola Forsberg | 32 | Wife | — | Missouri |
| 19 | Brannon Forsberg | 8 | Son | — | Illinois |
| 20 | George Ostrem | 21 | Lodger | Shear Operator | Missouri |
| 21 | Selma Carlson | 46 | Head | Housekeeper | Sweden |
| 22 | Walter Carlson | 22 | Son | Machine Operator | Iowa |
| 23 | Kenneth Dockerty | 25 | Head | Machine Operator | Illinois |
| 24 | Fern Dockerty | 24 | Wife | — | Illinois |
| 25 | Terrence Dockerty | 1 | Son | — | Illinois |
| 26 | Earl L. Rank | 32 | Head | Engineer | Illinois |
| 27 | Elaine Rank | 30 | Wife | — | Missouri |
| 28 | James Rank | 6 | Son | — | Illinois |
| 29 | Thomas Rank | 3 | Son | — | Illinois |
| 30 | John Rank | 1 | Son | — | Illinois |
| 31 | Fred Gustafson | 66 | Father in law | — | Iowa |
| 32 | Ellen Kelley | 75 | Head | — | Irish Free State |
| 33 | Julia Kelley | 47 | Daughter | Chief Operator | Illinois |
| 34 | Harold T. Long | 35 | Head | Machinist | Illinois |
| 35 | Clara Long | 35 | Wife | — | Minnesota |
| 36 | Harold Jr. Long | 16 | Son | Waiter | Illinois |
| 37 | Edward Long | 13 | Son | — | Illinois |
| 38 | Hazel Eveland | 51 | Head | Stock Chaser | Illinois |
| 39 | Raymond Verstraete | 25 | Partner | Machinist | Iowa |
| 40 | Le Roy Cambo | 21 | Head | Draftsman | Tennessee |
Pedigree Summary
Harold + 1 sibling
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)