JD
James Day — 1940 US Census Record
Model Tree available1940 United States Federal Census · Lake-County, Illinois
Our Model Tree links this James Day across the 1920, 1930 and 1940 US Censuses in Lake-County, Illinois (XGBoost, ~Confirmed), with identified parents Frederick & Mabel — first a son (b.~1914), then head of a 3-person household.
Age 26
b. ~1914
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Lake-County, Illinois |
| Surname | Day |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Waukegan city |
| 1935 Residence (County) | Lake |
| Additional Details | |
| Occupation | Salesman |
| Industry | Chain Store |
| Class of Worker | PW |
| Hours Worked | 30 |
| Income (1939) | 1300 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Salesman |
| Township / Ward | Waukegan City |
| Est. Birth Year | ~1914 |
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 James | Age | Birth yr |
|---|---|---|---|---|
| Mabel Day | Head | — | 57 | ~1883 |
| Josephine Day | Other | — | 25 | ~1915 |
| James Day | Son | — | 26 | ~1914 |
Census Appearances
1920
Lake, Illinois
Son, age 6
Lake, Illinois · implied b. ~1914 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Day |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Lake, Illinois
Son, age 16
Lake, Illinois · implied b. ~1914 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Day |
| Given Name | James |
| 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
Lake-County, Illinois
Son, age 26
Lake-County, Illinois · implied b. ~1914 — 3 household members
| Surname | Day |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Waukegan city |
| 1935 Residence (County) | Lake |
| Occupation | Salesman |
| Industry | Chain Store |
| Class of Worker | PW |
| Hours Worked | 30 |
| Income (1939) | 1300 |
| 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 James Day across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Frederick Day (~0.92 confidence) and mother Mabel Day (~0.92 confidence) and mother Mabel Day (~0.92 confidence) and mother Mabel Day (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Frederick Day
b. ~1875
Source father
● Household
· direct · ~0.92
Mother
Mabel Day
b. ~1883
Source mother
● Household
· direct · ~0.92
Mother
Mabel Day
b. ~1883
Source mother
● Household
· direct · ~0.92
Mother
Mabel Day
b. ~1883
Source mother
● Household
· direct · ~0.92
This person
Anchor record
James Day
Son · 1940 · age 26 · b. ~1914 · 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 — Lake-County, Illinois
Open full size
1940 US Federal Census — Lake-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00830-00629)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Walter Wilmington | 25 | Head | Buffer | Illinois |
| 2 | Lucille Wilmington | 24 | Wife | — | Michigan |
| 3 | Regina Wilmington | 4 | Daughter | — | Indiana |
| 4 | Delores Wilmington | 2 | Daughter | — | Illinois |
| 5 | Walter John Wilmington | 1 | Son | — | Illinois |
| 6 | John Kramer | 50 | Head | Machinist | Wisconsin |
| 7 | Agnes Kramer | 47 | Wife | — | Illinois |
| 8 | Lyle Kramer | 23 | Son | Asst. Ind. Engineer | Illinois |
| 9 | Franklin Kramer | 21 | Son | Buffer | Illinois |
| 10 | Ruth Kramer | 19 | Daughter | Waitress | Illinois |
| 11 | Eva Kramer | 15 | Daughter | — | Illinois |
| 12 | Carol Kramer | 6 | Daughter | — | Illinois |
| 13 | Amelia Wilmington | 72 | Head | — | Illinois |
| 14 | Jessie Sides | 42 | Daughter | Saleslady | Illinois |
| 15 | Rodney Sides | 42 | Son-in-law | Buffer | Illinois |
| 16 | George Sides | 13 | Grandson | — | Illinois |
| 17 | William Daggett | 39 | Head | Truck Driver | Wisconsin |
| 18 | Louise Daggett | 34 | Wife | Waitress | Iowa |
| 19 | Betty Daggett | 5 | Daughter | — | Wisconsin |
| 20 | Paul Crowley | 25 | Brother-in-law | Nailer | South Dakota |
| 21 | Charles Westlund | 53 | Head | — | Germany |
| 22 | Strand Westlund | 54 | Wife | — | Chicago |
| 23 | Herbert Westlund | 35 | Son | Housekeeper | Illinois |
| 24 | Glenn Morgan | 50 | Head | Carpenter | Nebraska |
| 25 | Luella Morgan | 45 | Wife | — | Wisconsin |
| 26 | Theodore H. Meyer | 69 | Head | — | Germany |
| 27 | Emma Meyer | 68 | Wife | — | Illinois |
| 28 | Pauline Scheblek | 26 | Lodger | Registered Nurse | Wisconsin |
| 29 | Norman Green | 28 | Head | Salesman | Montana |
| 30 | Lucille Green | 29 | Wife | — | Illinois |
| 31 | Norman B. Green | 1 | Son | — | Illinois |
| 32 | Mabel Day | 57 | Head | — | Illinois |
| 33 | James Day THIS PERSON | 26 | Son | Salesman | Illinois |
| 34 | Josephine Day | 25 | Daughter-in-law | Waitress | Michigan |
| 35 | Joe Sarbovak | 46 | Head | Truck Driver | New York |
| 36 | Marie Sarbovak | 50 | Wife | — | New York |
| 37 | John Lampinen | 29 | Head | Machinist Helper | Minnesota |
| 38 | Sarah Lampinen | 24 | Wife | — | Illinois |
| 39 | John Lampinen | 4 | Son | — | Illinois |
| 40 | Edwin Lampinen | 61 | Father | Carpenter | Finland |
Pedigree Summary
James
Gen 1 · 4 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)