TS
Theodore Smith — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Theodore Smith across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Daniel & Daniel — first a son (b.~1917), then head of a 8-person household.
Age 23
b. ~1917
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Smith |
| Given Name | Theodore |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Clerk |
| Industry | Liquor Store |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 400 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Clerk |
| Township / Ward | Chicago |
| Est. Birth Year | ~1917 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Theodore | Age | Birth yr |
|---|---|---|---|---|
| Ann Smith | Daughter | — | 18 | ~1922 |
| Daniel Smith | Head | — | 55 | ~1885 |
| Theodore Smith | Son | — | 23 | ~1917 |
| Albert Smith | Son | — | 22 | ~1918 |
| Charles Smith | Son | — | 17 | ~1923 |
| Daniel Smith | Son | — | 20 | ~1920 |
| William Smith | Son | — | 16 | ~1924 |
| Ella Smith | Spouse | — | 54 | ~1886 |
Census Appearances
1920
Cook, Illinois
Son, age 3
Cook, Illinois · implied b. ~1917 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Smith |
| Given Name | Theo Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Ohio |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Son, age 13
Cook, Illinois · implied b. ~1917 — 12 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Smith |
| Given Name | Theodore |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| 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
Cook-County, Illinois
Son, age 23
Cook-County, Illinois · implied b. ~1917 — 8 household members
| Surname | Smith |
| Given Name | Theodore |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Occupation | Clerk |
| Industry | Liquor Store |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 400 |
| Highest Grade | H-4 |
| 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 Theodore Smith across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Daniel Smith (~0.92 confidence) and father Daniel Smith (~0.92 confidence) and mother Ella Smith (~0.92 confidence) and father Theo Smith (~0.92 confidence) and mother Catherine Smith (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Daniel Smith
b. ~1885
Source father
● Household
· direct · ~0.92
Father
Daniel Smith
b. ~1885
Source father
● Household
· direct · ~0.92
Mother
Ella Smith
b. ~1887
Source mother
● Household
· direct · ~0.92
Father
Theo Smith
b. ~1892
Source father
● Household
· direct · ~0.92
Mother
Catherine Smith
b. ~1897
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Theodore Smith
Son · 1940 · age 23 · b. ~1917 · Illinois
★ You are viewing this record
Sibling
Albert Smith
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ann Smith
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Daniel Smith
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Smith
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Charles Smith
Sibling · 1940 · age 17
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-t0627-01015-00106)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Mary Keil | 81 | Head | — | Illinois |
| 42 | Matthew Keil | 51 | Son | Salesman | Illinois |
| 43 | Elizabeth Keil | 39 | Daughter | — | Illinois |
| 44 | Felix Stenke | 24 | Head | Caretaker | Pennsylvania |
| 45 | Patrick Byrne | 54 | Head | Laborer | Northern Ireland |
| 46 | Katherine Byrne | 52 | Wife | — | Irish Free State (Eire) |
| 47 | Mary Byrne | 20 | Daughter | Waitress | Illinois |
| 48 | Theresa Byrne | 15 | Daughter | — | Illinois |
| 49 | Timothy Sullivan | 38 | Head | Laborer | Irish Free State (Eire) |
| 50 | Mary Sullivan | 47 | Wife | Chambermaid | Irish Free State (Eire) |
| 51 | William Sullivan | 14 | Son | — | Illinois |
| 52 | James Sullivan | 7 | Son | — | Illinois |
| 53 | Timothy Sullivan | 3 | Son | — | Illinois |
| 54 | Daniel Smith | 55 | Head | Painter | Illinois |
| 55 | Ella Smith | 54 | Wife | — | Illinois |
| 56 | Theodore Smith THIS PERSON | 23 | Son | Clerk | Illinois |
| 57 | Albert Smith | 22 | Son | Truck Driver | Illinois |
| 58 | Daniel Jr Smith | 20 | Son | Clerk | Illinois |
| 59 | Ann Smith | 18 | Daughter | — | Illinois |
| 60 | Charles Smith | 17 | Son | — | Illinois |
| 61 | William Smith | 16 | Son | Delivery Boy | Illinois |
| 62 | Bridget Byrne | 70 | Head | — | Northern Ireland |
| 63 | Anne Byrne | 67 | Sister | — | Northern Ireland |
| 64 | Patrick Gibbons | 55 | Head | Bottom Man | Irish Free State (Eire) |
| 65 | Agnes Gibbons | 52 | Wife | — | Irish Free State (Eire) |
| 66 | Thomas Gibbons | 14 | Son | — | Illinois |
| 67 | Maurice Riordan | 52 | Lodger | Laborer | Irish Free State (Eire) |
| 68 | Frank O'Neal | 28 | Head | Salesman | Illinois |
| 69 | Celia O'Neal | 26 | Wife | — | Illinois |
| 70 | Frank Jr O'Neal | 3 | Son | — | Illinois |
| 71 | Nancy O'Neal | 1 | Daughter | — | Illinois |
| 72 | Frank Zernitz | 38 | Head | Stripper | Illinois |
| 73 | Theodore Zernitz | 13 | Daughter | — | Illinois |
| 74 | Charlene Zernitz | 11 | Daughter | — | Illinois |
| 75 | Russell E Wells | 29 | Head | Shearman | Illinois |
| 76 | Irene Wells | 31 | Wife | — | Illinois |
| 77 | Sharondel Wells | 4 | Daughter | — | Illinois |
| 78 | Jessie Hallquist | 40 | Head | Cook | Florida |
| 79 | Albert Hallquist | 19 | Son | Bus Boy | Florida |
| 80 | John Frager | 43 | Head | Building Manager | At Sea |
Pedigree Summary
Theodore + 5 siblings
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)