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Thomas Armstrong — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Thomas Armstrong across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents John & Cecelia — first a head (b.~1899), then head of a 3-person household.
Age 41
b. ~1899
Male
Head
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Armstrong |
| Given Name | Thomas |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 41 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago, city |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Automobile Salesman |
| Industry | Standard Spring Co. |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 1800 |
| Highest Grade | 5 |
| 1935 Residence | Same house |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Automobile Salesman |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1899 |
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 Thomas | Age | Birth yr |
|---|---|---|---|---|
| Lloyd Armstrong | Son | — | 11 | ~1929 |
| Cecelia Armstrong | Spouse | — | 43 | ~1897 |
| Thomas Armstrong | Head | — | 41 | ~1899 |
Census Appearances
1920
Cook, Illinois
Son, age 19
Cook, Illinois · implied b. ~1901 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Armstrong |
| Given Name | Thomas R. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | Clerk |
| Industry | Post Office |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Head, age 29
Cook, Illinois · implied b. ~1901 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Armstrong |
| Given Name | Thomas C. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Married |
| Birthplace | Illinois |
| Age at First Marriage | 23 |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | Clerk |
| Industry | Hotel |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Head, age 41
Cook-County, Illinois · implied b. ~1899 — 3 household members
| Surname | Armstrong |
| Given Name | Thomas |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 41 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago, city |
| 1935 Residence (County) | Cook |
| Occupation | Automobile Salesman |
| Industry | Standard Spring Co. |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 1800 |
| Highest Grade | 5 |
| 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 Thomas Armstrong across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Armstrong (~0.92 confidence) and mother Cecelia Armstrong (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Armstrong
b. ~1842
Source father
● Household
· direct · ~0.92
Mother
Cecelia Armstrong
b. ~1867
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Thomas Armstrong
Head · 1940 · age 41 · b. ~1899 · 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
40 people indexed on this census page (nara:1940:m-t0627-00984-00235)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | June Piening | 3 | Daughter | — | Illinois |
| 42 | John V. Piening | 0 | Son | — | Illinois |
| 43 | Arnold Helmuth | 55 | Head | Assembler | Illinois |
| 44 | Laura Helmuth | 53 | Wife | — | Philadelphia |
| 45 | Howard Philbert | 39 | Head | Switchman | Illinois |
| 46 | Myrtle Philbert | 34 | Wife | — | Illinois |
| 47 | Howard Jr. Philbert | 9 | Son | — | Illinois |
| 48 | Ronald G. Philbert | 5 | Son | — | Illinois |
| 49 | Samuel Lorentzen | 38 | Head | Painter House | Michigan |
| 50 | Lucille Lorentzen | 36 | Wife | — | Illinois |
| 51 | Kenneth Lorentzen | 12 | Son | — | Illinois |
| 52 | Doris Lou Lorentzen | 5 | Daughter | — | Illinois |
| 53 | Carolyn Lorentzen | 4 | Daughter | — | Illinois |
| 54 | Charles Reinlie | 56 | Head | Foreman Plater | Illinois |
| 55 | Ruth Reinlie | 49 | Wife | — | Illinois |
| 56 | Merle Reinlie | 20 | Daughter | Bookkeeper | Illinois |
| 57 | Robert Reinlie | 19 | Son | — | Illinois |
| 58 | June Reinlie | 12 | Daughter | — | Illinois |
| 59 | Ruth Reinlie | 9 | Daughter | — | Ohio |
| 60 | Here Ends Block Three And Begins Block Four | None | — | — | — |
| 61 | James Mahon | 50 | Head | Auto Mechanic | Illinois |
| 62 | Pearl Mahon | 50 | Wife | — | N. Dakota |
| 63 | Evelyn Mahon | 19 | Daughter | — | S. Dakota |
| 64 | Edward Mahon | 17 | Son | — | S. Dakota |
| 65 | Joseph Szabo | 31 | Head | Machinist | Hungary |
| 66 | Helen Szabo | 26 | Wife | Folding Machine Operator | Illinois |
| 67 | Thomas Armstrong THIS PERSON | 41 | Head | Automobile Salesman | Illinois |
| 68 | Cecelia Armstrong | 43 | Wife | — | Minnesota |
| 69 | Lloyd Armstrong | 11 | Son | — | Illinois |
| 70 | George Jensen | 55 | Head | Manager Matron | Norway |
| 71 | Ray Jensen | 32 | Son | Electrician | Illinois |
| 72 | Charles Long | 41 | Head | Auto Mechanic | Illinois |
| 73 | Alice Long | 22 | Wife | Hairdresser | Illinois |
| 74 | Charles Long | 9 | Son | — | Illinois |
| 75 | Florence Jackson | 46 | Sister-in-law | Housework | Illinois |
| 76 | Fred Bonn | 24 | Head | Electrician Engineer | Illinois |
| 77 | Anne Bonn | 22 | Wife | — | England |
| 78 | Fred W. Bonn | 2 | Son | — | Illinois |
| 79 | Barbara Bonn | 0 | Daughter | — | Illinois |
| 80 | Willie Settle | 27 | Brother-in-law | Office Manager | England |
Pedigree Summary
Thomas
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)