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William Hartman — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this William Hartman across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Peter & Sibella — first a son (b.~1907), then head of a 3-person household.
Age 33
b. ~1907
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Hartman |
| Given Name | William L. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 33 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Oak Park Village |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Accountant |
| Industry | Refrigerator manufacturing |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 1800 |
| Highest Grade | C-2 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Accountant |
| Township / Ward | Oak Park Village |
| Est. Birth Year | ~1907 |
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 William | Age | Birth yr |
|---|---|---|---|---|
| Peter Hartman | Head | — | 74 | ~1866 |
| Sibella Hartman | Spouse | — | 69 | ~1871 |
| William Hartman | Son | — | 33 | ~1907 |
Census Appearances
1920
Cook, Illinois
Son, age 12
Cook, Illinois · implied b. ~1908 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hartman |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | German |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Son, age 22
Cook, Illinois · implied b. ~1908 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hartmann |
| Given Name | William Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Occupation | Clerk |
| Industry | Broker |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 33
Cook-County, Illinois · implied b. ~1907 — 3 household members
| Surname | Hartman |
| Given Name | William L. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 33 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Oak Park Village |
| 1935 Residence (County) | Cook |
| Occupation | Accountant |
| Industry | Refrigerator manufacturing |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 1800 |
| 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 William Hartman across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Peter Hartman (~0.92 confidence) and mother Sibella Hartman (~0.92 confidence) and mother Margaret Hartmann (~0.92 confidence) and father William Hartman (~0.92 confidence) and father William Hartmann (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Peter Hartman
b. ~1866
Source father
● Household
· direct · ~0.92
Mother
Sibella Hartman
b. ~1871
Source mother
● Household
· direct · ~0.92
Mother
Margaret Hartmann
b. ~1873
Source mother
● Household
· direct · ~0.92
Father
William Hartman
b. ~1874
Source father
● Household
· direct · ~0.92
Father
William Hartmann
b. ~1875
Source father
● Household
· direct · ~0.92
This person
Anchor record
William Hartman
Son · 1940 · age 33 · b. ~1907 · 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 — Cook-County, Illinois
Open full size
1940 US Federal Census — Cook-County, Illinois
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-00786-00104)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Marilyn J. Thinn | 2 | Grand-daughter | — | Illinois |
| 2 | Dennis A. Thinn | 1 | Grand-son | — | Illinois |
| 3 | Reinhold T. Knubbe | 62 | Head | Interior Decorator | Illinois |
| 4 | Ida Knubbe | 61 | Wife | — | Illinois |
| 5 | George Lampere | 43 | Head | Barber | Greece |
| 6 | Emma Lampere | 34 | Wife | — | Poland |
| 7 | George Jr. Lampere | 12 | Son | — | Illinois |
| 8 | Gloria Lampere | 7 | Daughter | — | Illinois |
| 9 | Lucille Hess | 35 | Lodger | File Clerk | Nebraska |
| 10 | William Klein | 34 | Head | Yard Salesman | Ohio |
| 11 | Mildred Klein | 35 | Wife | — | Illinois |
| 12 | Shirley Klein | 7 | Daughter | — | Illinois |
| 13 | Donald Klein | 2 | Son | — | Illinois |
| 14 | Peter J. Hartman | 74 | Head | — | Illinois |
| 15 | Sibella H. Hartman | 69 | Wife | — | Illinois |
| 16 | William L. Hartman THIS PERSON | 33 | Son | Accountant | Illinois |
| 17 | Arthur Simonson | 52 | Head | — | Denmark |
| 18 | Madeline Simonson | 52 | Wife | Comptometer Operator | Illinois |
| 19 | Mathias Simonson | 83 | Father | — | Denmark |
| 20 | Arthur G. Dutton | 58 | Head | Floor Manager | Iowa |
| 21 | Mamie Dutton | 49 | Wife | — | Illinois |
| 22 | Wilbur Dutton | 25 | Son | Chauffeur | Illinois |
| 23 | Lois Dutton | 23 | Daughter | File Clerk | Illinois |
| 24 | Edward Dutton | 20 | Son | Inspector | Texas |
| 25 | Marjorie Dutton | 18 | Daughter | New Worker | Texas |
| 26 | Jeannette Dutton | 16 | Daughter | — | Illinois |
| 27 | Donald Dutton | 14 | Son | — | Illinois |
| 28 | George Reid | 63 | Head | House Painter | Scotland |
| 29 | Margaret Reid | 65 | Wife | — | Scotland |
| 30 | Mary Fullerton | 65 | Sister-in-law | — | Scotland |
| 31 | Martin Vanema | 47 | Lodger | Delivery Man | Illinois |
| 32 | Angeline Vanema | 49 | Lodger | Sales Clerk | Illinois |
| 33 | Mervin C. Berger | 30 | Lodger | Machine Operator | Minnesota |
| 34 | Violet R. Berger | 27 | Lodger | File Clerk | Illinois |
| 35 | Belle Wandell | 70 | Lodger | — | Illinois |
| 36 | Gustav Staehle | 66 | Head | Coal Merchant | Germany |
| 37 | Alma Staehle | 61 | Wife | — | Germany |
| 38 | Robert Staehle | 16 | Son | — | Illinois |
| 39 | August Straub | 60 | Head | Baker | Germany |
Pedigree Summary
William
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)