DT
David Thompson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Lake-County, Illinois
Our Model Tree links this David Thompson across the 1920, 1930 and 1940 US Censuses in Lake-County, Illinois (XGBoost, ~Confirmed), with identified parents David & Margaret — first a head (b.~1915), then head of a 4-person household.
Age 25
b. ~1915
Male
Head
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Lake-County, Illinois |
| Surname | Thompson |
| Given Name | David |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Waukegan (City) |
| 1935 Residence (County) | Lake |
| Additional Details | |
| Occupation | Sausage-Maker |
| Industry | Sausage Factory |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 1040 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Sausage-Maker |
| Township / Ward | Waukegan City |
| Est. Birth Year | ~1915 |
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 David | Age | Birth yr |
|---|---|---|---|---|
| Jean Thompson | Daughter | — | ~1940 | |
| Margaret Thompson | Daughter | — | 2 | ~1938 |
| David Thompson | Head | — | 25 | ~1915 |
| Margaret Thompson | Spouse | — | 22 | ~1918 |
Census Appearances
1920
Lake, Illinois
Son, age 4
Lake, Illinois · implied b. ~1916 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thompson |
| Given Name | David N. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Occupation | none |
| Mother Tongue | Scotch |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Lake, Illinois
Son, age 15
Lake, Illinois · implied b. ~1915 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thompson |
| Given Name | David H. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Lake-County, Illinois
Head, age 25
Lake-County, Illinois · implied b. ~1915 — 4 household members
| Surname | Thompson |
| Given Name | David |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Waukegan (City) |
| 1935 Residence (County) | Lake |
| Occupation | Sausage-Maker |
| Industry | Sausage Factory |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 1040 |
| Highest Grade | Hs 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 David Thompson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father David Thompson (~0.92 confidence) and mother Margaret Thompson (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
David Thompson
b. ~1879
Source father
● Household
· direct · ~0.92
Mother
Margaret Thompson
b. ~1885
Source mother
● Household
· direct · ~0.92
This person
Anchor record
David Thompson
Head · 1940 · age 25 · b. ~1915 · Illinois
★ 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 — Lake-County, Illinois
Open full size
1940 US Federal Census — Lake-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00830-00738)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Amanda Kerpan | 10 | Daughter | — | Illinois |
| 42 | Louis Jr. Kerpan | 6 | Son | — | Wisconsin |
| 43 | Deanna May Kerpan | 1 | Daughter | — | Illinois |
| 44 | Max E. May | 37 | Head | Clerical Worker | Germany |
| 45 | Genevieve May | 35 | Wife | — | Illinois |
| 46 | Richard May | 12 | Son | — | Illinois |
| 47 | Darrell May | 5 | Son | — | Illinois |
| 48 | Henry Bayles | 65 | Head | Fireman Oil House | England |
| 49 | Margaret Bayles | 57 | Wife | — | Norway |
| 50 | Mark Hoffman | 55 | Head | General Shop Worker | Illinois |
| 51 | Victoria Hoffman | 53 | Wife | — | Netherlands |
| 52 | David Thompson | 63 | Head | Car-Cleaner | Scotland |
| 53 | Margaret Thompson | 55 | Wife | — | Scotland |
| 54 | Roy B. Johns | 55 | Head | Maintenance Man | Indiana |
| 55 | Ethel Johns | 52 | Wife | — | Indiana |
| 56 | David Thompson THIS PERSON | 25 | Head | Sausage-Maker | Iowa |
| 57 | Margaret Thompson | 22 | Wife | — | Illinois |
| 58 | Margaret Thompson | 2 | Daughter | — | Illinois |
| 59 | Jean Thompson | 0 | Daughter | — | Illinois |
| 60 | Wayne Helli | 31 | Head | Butcher | Michigan |
| 61 | Dorothy Helli | 26 | Wife | Trained Nurse | Illinois |
| 62 | Donna Mae Helli | 3 | Daughter | — | Illinois |
| 63 | Wayne Laine | 24 | Cousin | Gasoline Station Attendant | Michigan |
| 64 | Ida Muak | 74 | Head | — | Norway |
| 65 | Michael Pavlick | 30 | Grand-Son-in-law | Tractor Operator | Illinois |
| 66 | Norma Pavlick | 22 | Grand-Daughter | — | Illinois |
| 67 | Richard Pavlick | 2 | Great Grandson | — | Illinois |
| 68 | Edward Sivula | 36 | Head | Plater | Illinois |
| 69 | Alice Sivula | 36 | Wife | — | Wisconsin |
| 70 | Earl E. Cashmore | 28 | Head | Manager | Illinois |
| 71 | Frances M. Cashmore | 27 | Wife | — | Montana |
| 72 | Emil Konstrup | 48 | Head | Laborer | Denmark |
| 73 | Dagmar Konstrup | 39 | Wife | — | Denmark |
| 74 | Irene Konstrup | 15 | Daughter | — | Illinois |
| 75 | Edwin Konstrup | 13 | Son | — | South Dakota |
| 76 | Metha Spice | 45 | Head | Labor Foreman | Wisconsin |
| 77 | Russell Spice | 19 | Son | — | Illinois |
| 78 | Leroy Spice | 15 | Son | — | Illinois |
| 79 | John Scheider | 56 | Head | — | Netherlands |
| 80 | Mary Scheider | 59 | Wife | — | Netherlands |
Pedigree Summary
David
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)