JD
John Day — 1940 US Census Record
Model Tree available1940 United States Federal Census · Knox-County, Tennessee
Our Model Tree links this John Day across the 1920, 1930 and 1940 US Censuses in Knox-County, Tennessee (XGBoost, ~Confirmed), with identified parents John & Mother — first a son (b.~1919), then head of a 4-person household.
Age 21
b. ~1919
Male
Son
Born: Tennessee
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Knox-County, Tennessee |
| Surname | Day |
| Given Name | John M. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Tennessee |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Knox |
| Additional Details | |
| Highest Grade | No 5 |
| 1935 Residence | Tennessee |
| Birth State | Tennessee |
| Birth Country | United States |
| Birthplace (normalized) | tennessee |
| Township / Ward | Dante |
| Est. Birth Year | ~1919 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| William Day | Head | — | 44 | ~1896 |
| John Day | Son | — | 21 | ~1919 |
| William Day | Son | — | 16 | ~1924 |
| Della Day | Spouse | — | 42 | ~1898 |
Census Appearances
1920
Knox, Tennessee
Son, age
Knox, Tennessee · implied b. ~1920 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Day |
| Given Name | John W. Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Tennessee |
| Father's Birthplace | Tennessee |
| Mother's Birthplace | Tennessee |
| Birth State | Tennessee |
| Birth Country | United States |
| Birthplace (normalized) | tennessee |
1930
Knox, Tennessee
Son, age 11
Knox, Tennessee · implied b. ~1919 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Day |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Tennessee |
| Father's Birthplace | Tennessee |
| Mother's Birthplace | Tennessee |
| Can Read/Write | Yes |
| Birth State | Tennessee |
| Birth Country | United States |
| Birthplace (normalized) | tennessee |
1940
Knox-County, Tennessee
Son, age 21
Knox-County, Tennessee · implied b. ~1919 — 4 household members
| Surname | Day |
| Given Name | John M. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Tennessee |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Knox |
| Highest Grade | No 5 |
| 1935 Residence | Tennessee |
| Birth State | Tennessee |
| Birth Country | United States |
| Birthplace (normalized) | tennessee |
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 John Day across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Day (~0.92 confidence) and mother Mother Day (~0.92 confidence) and father William Day (~0.92 confidence) and mother Della Day (~0.92 confidence) and mother May Day (~0.92 confidence) and father John Day (~0.92 confidence). The pedigree spans 1 generation with 6 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Day
b. ~1890
Source father
● Household
· direct · ~0.92
Mother
Mother Day
b. ~1895
Source mother
● Household
· direct · ~0.92
Father
William Day
b. ~1896
Source father
● Household
· direct · ~0.92
Mother
Della Day
b. ~1898
Source mother
● Household
· direct · ~0.92
Mother
May Day
b. ~1904
Source mother
● Household
· direct · ~0.92
Father
John Day
b. ~1906
Source father
● Household
· direct · ~0.92
This person
Anchor record
John Day
Son · 1940 · age 21 · b. ~1919 · Tennessee
★ You are viewing this record
Sibling
William Day
Sibling · 1940 · age 16
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 — Knox-County, Tennessee
Open full size
1940 US Federal Census — Knox-County, Tennessee
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03910-00899)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | George Inzer | 16 | Son | Dresser | Tennessee |
| 42 | Emil C. Gadd | 24 | Head | Dresser | Tennessee |
| 43 | Esther Gadd | 23 | Wife | — | Tennessee |
| 44 | Emily Lou Gadd | 1 | Daughter | — | Tennessee |
| 45 | Raymond Black | 31 | Head | Trucker | Tennessee |
| 46 | Alana Black | 28 | Wife | — | Michigan |
| 47 | Helen Black | 7 | Daughter | — | Michigan |
| 48 | Raymond Black | 4 | Son | — | Tennessee |
| 49 | John Black | 1 | Son | — | Michigan |
| 50 | Donald Bates | 22 | Head | Lumber Sorter | W. Virginia |
| 51 | Dorothy Bates | 20 | Wife | — | W. Virginia |
| 52 | Robert Ledford | 34 | Head | Knitter | Georgia |
| 53 | Esthel Ledford | 35 | Wife | — | Tennessee |
| 54 | Evelyn Ledford | 9 | Daughter | — | Tennessee |
| 55 | Delley Ledford | 6 | Daughter | — | Tennessee |
| 56 | Wilma Ledford | 4 | Daughter | — | Tennessee |
| 57 | Denny Ledford | 2 | Son | — | Tennessee |
| 58 | William Day | 44 | Head | Carpenter | Tennessee |
| 59 | Della Day | 42 | Wife | Cleaner | Tennessee |
| 60 | John M. Day THIS PERSON | 21 | Son | — | Tennessee |
| 61 | William Day | 16 | Son | — | Tennessee |
| 62 | Charles Ballard | 50 | Head | Farmer | Tennessee |
| 63 | Esther Ballard | 30 | Wife | — | Tennessee |
| 64 | Clifford Ballard | 1 | Son | — | Tennessee |
| 65 | W. H. Williams | 47 | Head | Machinist | Virginia |
| 66 | Oma Williams | 32 | Wife | Machine Operator | Tennessee |
| 67 | Warren Atkins | 40 | Brother-in-law | — | Tennessee |
| 68 | Ross Belle Baird | 28 | Head | Cafeteria Helper | Kentucky |
| 69 | Thomas Baird | 10 | Son | — | Tennessee |
| 70 | Bertha Baird | 9 | Daughter | — | Tennessee |
| 71 | Beulah Baird | 5 | Daughter | — | Tennessee |
| 72 | Ruth Baird | 3 | Daughter | — | Tennessee |
| 73 | Dewey Lay | 50 | Head | Farmer | Tennessee |
| 74 | Maggie Lay | 46 | Wife | — | Tennessee |
| 75 | Elizabeth Lay | 15 | Daughter | — | Tennessee |
| 76 | Elmer Lay | 17 | Son | — | Tennessee |
| 77 | June Lay | 11 | Daughter | — | Tennessee |
| 78 | J. N. Fine | 50 | Head | — | Tennessee |
| 79 | Ida Fine | 44 | Wife | — | Tennessee |
| 80 | Dennis Fine | 19 | Son | Plumber Helper | Tennessee |
Pedigree Summary
John + 1 sibling
Gen 1 · 6 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)