WU
William Underwood — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this William Underwood across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1886), then head of a 6-person household.
Age 54
b. ~1886
Male
Head
Born: Wisconsin
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Underwood |
| Given Name | William J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 54 |
| Marital Status | Married |
| Birthplace | Wisconsin |
| 1935 Residence (City) | Chicago City |
| Additional Details | |
| Occupation | Dentist |
| Industry | Private Practice |
| Class of Worker | OA |
| Hours Worked | 68 |
| Income (1939) | 1282 |
| Highest Grade | No 8 |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
| Occupation | Dentist |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1886 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Henry Underwood | Son | — | 12 | ~1928 |
| William Underwood | Head | — | 54 | ~1886 |
| Robert Underwood | Son | — | 18 | ~1922 |
| Edith Underwood | Spouse | — | 51 | ~1889 |
| Winifred Underwood | Daughter | — | 6 | ~1934 |
| Charles Underwood | Son | — | 22 | ~1918 |
Census Appearances
1930
Cook, Illinois
Other, age 39
Cook, Illinois · implied b. ~1891 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Underwood |
| Given Name | Willard |
| Relationship to Head | General Practice |
| Sex | M |
| Color / Race | White |
| Age | 39 |
| Marital Status | Married |
| Birthplace | Wisconsin |
| Age at First Marriage | 22 |
| Father's Birthplace | Illinois |
| Mother's Birthplace | New York |
| Occupation | Dentist |
| Class of Worker | OA |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 9000 |
| Radio Set | R |
| Veteran | No |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
1940
Cook-County, Illinois
Head, age 54
Cook-County, Illinois · implied b. ~1886 — 6 household members
| Surname | Underwood |
| Given Name | William J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 54 |
| Marital Status | Married |
| Birthplace | Wisconsin |
| 1935 Residence (City) | Chicago City |
| Occupation | Dentist |
| Industry | Private Practice |
| Class of Worker | OA |
| Hours Worked | 68 |
| Income (1939) | 1282 |
| Highest Grade | No 8 |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
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 Underwood across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Underwood
Head · 1940 · age 54 · b. ~1886 · Illinois
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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
38 people indexed on this census page (nara:1940:m-t0627-01000-00301)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Grace Alke | 19 | Sister | — | Michigan |
| 42 | Ottilie Strem | 65 | Head | — | Germany |
| 43 | Clara Strem | 40 | Daughter | Typist | Illinois |
| 44 | Margaret Strem | 35 | Daughter | Board Operator | Illinois |
| 45 | Ida Gierke | 70 | Head | — | Illinois |
| 46 | Arthur Gierke | 34 | Son | Salesman | Illinois |
| 47 | Veronica Gierke | 33 | Daughter | — | Illinois |
| 48 | Eleanor Gierke | 10 | Granddaughter | — | Illinois |
| 49 | Marion Gierke | 8 | Granddaughter | — | Illinois |
| 50 | Robert Gierke | 6 | Grandson | — | Illinois |
| 51 | Augusta Dorey | 61 | Head | — | Germany |
| 52 | Rose Carl | 36 | Sister | Bookkeeper | Illinois |
| 53 | Emma Burch | 72 | Lodger | — | Germany |
| 54 | John Vlack | 42 | Lodger | Machine Hand | Bohemia |
| 55 | Albert Morsch | 67 | Head | Carpenter | Michigan |
| 56 | Teresa Morsch | 63 | Wife | — | Illinois |
| 57 | William T. Williams | 46 | Son-in-law | Cashier | Illinois |
| 58 | Elvira Williams | 39 | Daughter | — | Illinois |
| 59 | Edna Gierke | 43 | Head | Stenographer | Illinois |
| 60 | Marion Gierke | 14 | Daughter | — | Florida |
| 61 | Hannah Jorgensen | 74 | Mother | — | Sweden |
| 62 | William J. Underwood THIS PERSON | 54 | Head | Dentist | Wisconsin |
| 63 | Edith J. Underwood | 51 | Wife | — | Wisconsin |
| 64 | Charles H. Underwood | 22 | Son | — | Illinois |
| 65 | Robert N. Underwood | 18 | Son | — | Illinois |
| 66 | Henry F. Underwood | 12 | Son | — | Illinois |
| 67 | Winifred Underwood | 6 | Daughter | — | Illinois |
| 68 | Curtis Peterson | 32 | Head | Collector | Illinois |
| 69 | Frances Peterson | 31 | Wife | — | Illinois |
| 70 | Marilyn Peterson | 5 | Daughter | — | Illinois |
| 71 | Richard Peterson | 4 | Son | — | Illinois |
| 72 | Alice Peterson | 70 | Mother | — | Illinois |
| 73 | William G. Kruse | 49 | Head | Asst. Engineer | Illinois |
| 74 | Elizabeth V. Kruse | 42 | Wife | — | Illinois |
| 75 | Robert Kruse | 20 | Son | Filing Clerk | Illinois |
| 76 | William Jr. Kruse | 14 | Son | Machine Hand | Illinois |
| 77 | Veronica Kruse | 9 | Daughter | — | Illinois |
| 78 | Elizabeth Schoof | 71 | Mother-in-law | — | Illinois |
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)