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William Spencer — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this William Spencer across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1925), then head of a 9-person household.
Age 15
b. ~1925
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Spencer |
| Given Name | William H |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Highest Grade | Hs 2 |
| 1935 Residence | Same House |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1925 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Cecelia Spencer | Daughter | — | 21 | ~1919 |
| Helen Spencer | Daughter | — | 18 | ~1922 |
| Maryann Spencer | Daughter | — | 23 | ~1917 |
| John Spencer | Head | — | 56 | ~1884 |
| William Spencer | Son | — | 15 | ~1925 |
| Thomas Spencer | Son | — | 17 | ~1923 |
| Robert Spencer | Son | — | 14 | ~1926 |
| John Spencer | Son | — | 20 | ~1920 |
| Mary Spencer | Spouse | — | 50 | ~1890 |
Census Appearances
1930
Cook, Illinois
Son, age 5
Cook, Illinois · implied b. ~1925 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Spencer |
| Given Name | William A |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | District of Columbia |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 15
Cook-County, Illinois · implied b. ~1925 — 9 household members
| Surname | Spencer |
| Given Name | William H |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Highest Grade | Hs 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 William Spencer across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Spencer
Son · 1940 · age 15 · b. ~1925 · Illinois
★ You are viewing this record
Sibling
Maryann Spencer
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Spencer
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Spencer
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Spencer
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Cecelia Spencer
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Spencer
Sibling · 1940 · age 20
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 — Cook-County, Illinois
Open full size
1940 US Federal Census — Cook-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01000-00383)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Edward Pauly | 3 | Son | — | Illinois |
| 42 | Austin Wheatley | 31 | Lodger | Clerk | Iowa |
| 43 | Carl Jacobsen | 43 | Head | Clerk | Wisconsin |
| 44 | Frank Debelak | 56 | Head | Painter | Austria |
| 45 | Mary Debelak | 49 | Wife | — | Austria |
| 46 | William Debelak | 26 | Son | Clerk | Illinois |
| 47 | Harlow Madden | 37 | Head | Lawyer | New Hampshire |
| 48 | Louise Madden | 37 | Wife | Lawyer | Illinois |
| 49 | Barbara Madden | 9 | Daughter | — | Illinois |
| 50 | Bertha Kopplin | 84 | Head | — | Germany |
| 51 | Raymond Kopplin | 50 | Son | Wood Worker | Illinois |
| 52 | Paul Kopplin | 48 | Son | Wood Worker | Illinois |
| 53 | Olga Kopplin | 46 | Daughter | Clerk | Illinois |
| 54 | John Meyer | 40 | Head | Insurance Agent | Illinois |
| 55 | Ruth Meyer | 41 | Wife | — | Illinois |
| 56 | Harriet Meyer | 17 | Daughter | — | Illinois |
| 57 | John Meyer | 14 | Son | — | Illinois |
| 58 | George Heath | 52 | Head | Clerk | Illinois |
| 59 | Anna Smith | 69 | Head | — | Illinois |
| 60 | Lucille Smith | 40 | Daughter | Office Clerk | Illinois |
| 61 | Mary Smith | 31 | Daughter | Reg. Nurse | Illinois |
| 62 | John C Spencer | 56 | Head | Merchant | Illinois |
| 63 | Mary Spencer | 50 | Wife | — | Washington, D.C. |
| 64 | Maryann Spencer | 23 | Daughter | New Worker | Illinois |
| 65 | Cecelia F Spencer | 21 | Daughter | — | Illinois |
| 66 | John E Spencer | 20 | Son | — | Illinois |
| 67 | Helen M Spencer | 18 | Daughter | — | Illinois |
| 68 | Thomas Spencer | 17 | Son | — | Illinois |
| 69 | William H Spencer THIS PERSON | 15 | Son | — | Illinois |
| 70 | Robert J Spencer | 14 | Son | — | Illinois |
| 71 | — | None | — | Minister | — |
| 72 | Bernard H Hemmeter | 44 | Head | Laborer | Maryland |
| 73 | Ruth Hemmeter | 41 | Wife | — | North Carolina |
| 74 | Bernard Hemmeter | 18 | Son | — | Illinois |
| 75 | Pearl Hemmeter | 16 | Daughter | — | Illinois |
| 76 | Winetred Hemmeter | 15 | Daughter | — | Illinois |
| 77 | Robert Hemmeter | 10 | Son | — | Illinois |
| 78 | John Hemmeter | 6 | Son | — | Illinois |
| 79 | Salvatore Corsi | 40 | Head | Police Officer | England |
| 80 | Lucy Corsi | 37 | Wife | — | Italy |
Related Census Records
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)