TM
Thomas Mcdonald — 1940 US Census Record
Model Tree available1940 United States Federal Census · Sangamon-County, Illinois
Our Model Tree links this Thomas Mcdonald across the 1920, 1930 and 1940 US Censuses in Sangamon-County, Illinois (XGBoost, ~Confirmed), with identified parents Lillian & Lydia — first a son (b.~1916), then head of a 3-person household.
Age 24
b. ~1916
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Sangamon-County, Illinois |
| Surname | McDonald |
| Given Name | Thomas |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Springfield City |
| 1935 Residence (County) | Sangamon |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same House |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Springfield City |
| Est. Birth Year | ~1916 |
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 |
|---|---|---|---|---|
| Thomas Mcdonald | Son | — | 24 | ~1916 |
| Lydia Mcdonald | Head | — | 53 | ~1887 |
| Jesse Mcdonald | Son | — | 13 | ~1927 |
Census Appearances
1920
Sangamon, Illinois
Other, age 6
Sangamon, Illinois · implied b. ~1914 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDonald |
| Given Name | Thomas |
| Relationship to Head | Grandson |
| Sex | M |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read | No |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Sangamon, Illinois
Son, age 16
Sangamon, Illinois · implied b. ~1914 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mc Donald |
| Given Name | Thomas |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Sangamon-County, Illinois
Son, age 24
Sangamon-County, Illinois · implied b. ~1916 — 3 household members
| Surname | McDonald |
| Given Name | Thomas |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Springfield City |
| 1935 Residence (County) | Sangamon |
| Income (1939) | 0 |
| Highest Grade | Hs 4 |
| 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 Mcdonald across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Lillian Mc Donald (~0.92 confidence) and mother Lydia Mcdonald (~0.92 confidence) and father Cashier Mc Donald (~0.60 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.81
Mother
Lillian Mc Donald
b. ~1886
Source mother
● Household
· direct · ~0.92
Mother
Lydia Mcdonald
b. ~1887
Source mother
● Household
· direct · ~0.92
Father
Cashier Mc Donald
b. ~1902
Source father
● Household
· direct · ~0.6
This person
Anchor record
Thomas Mcdonald
Son · 1940 · age 24 · b. ~1916 · Illinois
★ You are viewing this record
Sibling
Jesse Mcdonald
Sibling · 1940 · age 13
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 — Sangamon-County, Illinois
Open full size
1940 US Federal Census — Sangamon-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00886-00097)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Lydia G. Mcdonald | 53 | Head | House Mother | Illinois |
| 42 | Thomas Mcdonald THIS PERSON | 24 | Son | — | Illinois |
| 43 | Jesse Mcdonald | 13 | Son | — | Illinois |
| 44 | George M. Beter | 46 | Head | — | Illinois |
| 45 | Shirley Beter | 20 | Daughter | Watchman | Illinois |
| 46 | Shirley Beter | 12 | Daughter | — | Illinois |
| 47 | Betty Ann Hill | 19 | Daughter | — | Illinois |
| 48 | Charles Hill | 23 | Son-in-law | Salesman | Illinois |
| 49 | John J. O'Keefe | 30 | Head | Clerk | Missouri |
| 50 | Kathryn W. O'Keefe | 23 | Wife | — | Illinois |
| 51 | Margaret O'Keefe | 2 | Daughter | — | Illinois |
| 52 | Adelbert Callaby | 37 | Head | Sales Engineer | Kentucky |
| 53 | Victoria Callaby | 32 | Wife | — | Kentucky |
| 54 | R. Jean Callaby | 9 | Daughter | — | Kentucky |
| 55 | Charles H. Buenhat | 26 | Head | Salesman | Illinois |
| 56 | Mildred D. Buenhat | 28 | Wife | Reg Nurse | Illinois |
| 57 | Russell Kittinger | 34 | Head | Cook | Illinois |
| 58 | Mona W. Kittinger | 29 | Wife | — | Illinois |
| 59 | Kittinger | 3 | Daughter | — | Illinois |
| 60 | Rhea Raisbeck | 29 | Lodger | Clerk | Illinois |
| 61 | Charles H. Petefish | 34 | Head | Teacher | Illinois |
| 62 | Helen Petefish | 33 | Wife | — | Illinois |
| 63 | Norma Petefish | 13 | Daughter | — | Illinois |
| 64 | Petefish | 7 | Daughter | — | Illinois |
| 65 | Harrison S. Noble | 50 | Head | — | Illinois |
| 66 | Adelia Noble | 51 | Wife | — | Illinois |
| 67 | Molly Noble | 22 | Daughter | Sales Operator | Illinois |
| 68 | Allen L. Smith | 48 | Head | Manual Arts Teacher | Wisconsin |
| 69 | Hazel H. Smith | 45 | Wife | — | Wisconsin |
| 70 | Allen Jr. Smith | 19 | Son | Clerk | Illinois |
| 71 | Robert Smith | 16 | Son | — | Illinois |
| 72 | Mary Smith | 6 | Daughter | — | Illinois |
| 73 | Frederick Markley | 49 | Head | Asst. Engineer | Missouri |
| 74 | Atha W. Markley | 30 | Wife | — | Illinois |
| 75 | Leslie Markley | 4 | Son | — | Illinois |
| 76 | Albert R. Hays | 49 | Head | Carpenter-Foreman | Illinois |
| 77 | Marie W. Hays | 41 | Wife | — | Illinois |
| 78 | Paul Hays | 23 | Son | Laborer | Illinois |
| 79 | Mary Hays | 22 | Daughter | Stenographer | Illinois |
| 80 | Orville Hays | 20 | Son | Carpenter Appr. | Illinois |
Pedigree Summary
Thomas + 1 sibling
Gen 1 · 3 parents
~0.81
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)