RD
Robert Day — 1940 US Census Record
Model Tree available1940 United States Federal Census · Lake-County, Illinois
Our Model Tree links this Robert Day across the 1920, 1930 and 1940 US Censuses in Lake-County, Illinois (XGBoost, ~Confirmed), with identified parents Frederick & Mabel — first a head (b.~1907), then head of a 4-person household.
Age 33
b. ~1907
Male
Head
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Lake-County, Illinois |
| Surname | Day |
| Given Name | Robert |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 33 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Waukegan City |
| 1935 Residence (County) | Lake |
| Additional Details | |
| Occupation | Maintenance |
| Industry | Telephone Company |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 2500 |
| Highest Grade | H-4 |
| 1935 Residence | Same Place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Maintenance |
| Township / Ward | Waukegan City |
| Est. Birth Year | ~1907 |
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 Robert | Age | Birth yr |
|---|---|---|---|---|
| Dorothy Day | Spouse | — | 28 | ~1912 |
| Laurice Day | Daughter | — | 7 | ~1933 |
| Barbara Day | Daughter | — | 4 | ~1936 |
| Robert Day | Head | — | 33 | ~1907 |
Census Appearances
1920
Lake, Illinois
Son, age 13
Lake, Illinois · implied b. ~1907 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Day |
| Given Name | Robert |
| 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 | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Lake, Illinois
Son, age 23
Lake, Illinois · implied b. ~1907 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Day |
| Given Name | Robert |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | clerk |
| Industry | Telephone |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Lake-County, Illinois
Head, age 33
Lake-County, Illinois · implied b. ~1907 — 4 household members
| Surname | Day |
| Given Name | Robert |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 33 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Waukegan City |
| 1935 Residence (County) | Lake |
| Occupation | Maintenance |
| Industry | Telephone Company |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 2500 |
| 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 Robert 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). The pedigree spans 1 generation with 3 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
This person
Anchor record
Robert Day
Head · 1940 · age 33 · b. ~1907 · 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-t0627-00831-00015)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Jo Anne Kirkham | 17 | Daughter | — | Illinois |
| 2 | Ned Harley | 27 | Nephew | Office Clerk | Indiana |
| 3 | Robert Day THIS PERSON | 33 | Head | Maintenance | Illinois |
| 4 | Dorothy @ Day | 28 | Wife | — | Illinois |
| 5 | Laurice Day | 7 | Daughter | — | Illinois |
| 6 | Barbara Day | 4 | Daughter | — | Illinois |
| 7 | Thomas F. Tyrrell | 51 | Head | Superintendent | Illinois |
| 8 | Martha @ Tyrrell | 50 | Wife | — | Iowa |
| 9 | Marilyn Tyrrell | 12 | Daughter | — | Illinois |
| 10 | Clarence Rahling | 30 | Head | Cost Accountant | Illinois |
| 11 | Carrie @ Rahling | 54 | Mother | — | Illinois |
| 12 | Raymond Thielen | 16 | Nephew | — | Illinois |
| 13 | Eunice Goodall | 51 | Lodger | Business Consultant | Michigan |
| 14 | Bernard Drew | 71 | Head | — | Illinois |
| 15 | Mary Drew | 33 | Daughter | Teacher | Illinois |
| 16 | Richard Drew | 29 | Son | Lawyer | Illinois |
| 17 | Thomas @ Drew | 26 | Son | Lifeguard | Illinois |
| 18 | Bernard Drew | 22 | Son | Proprietor | Illinois |
| 19 | William Dunlap | 69 | Lodger | — | Illinois |
| 20 | Annie @ Remago | 49 | Head | Children'S Nurse | Scotland |
| 21 | Elizabeth Remago | 15 | Daughter | — | Illinois |
| 22 | Sheila Remago | 9 | Daughter | — | Illinois |
| 23 | Emma Pater | 73 | Head | — | Canada English |
| 24 | Frank @ Labalie | 57 | Head | Interior Decorator | Michigan |
| 25 | Gladys Labalie | 50 | Wife | Sewing Instructor | Iowa |
| 26 | Carl Gibson | 33 | Head | Proprietor | Wisconsin |
| 27 | Agnes @ Gibson | 39 | Wife | Waitress | Wisconsin |
| 28 | Laura @ Bockeloh | 44 | Head | — | Wisconsin |
| 29 | Vivien Bockeloh | 22 | Daughter | Switchboard Operator | Illinois |
| 30 | Janet Bockeloh | 19 | Daughter | Operator | Illinois |
| 31 | William Bockeloh | 15 | Son | — | Canada English |
| 32 | Clifford Needham | 39 | Nephew | Bookkeeper | Illinois |
| 33 | Lawrence @ Corrigan | 56 | Head | Conductor | Missouri |
| 34 | Elizabeth Corrigan | 52 | Wife | — | Indiana |
| 35 | Joseph Corrigan | 24 | Son | Chauffeur | Indiana |
| 36 | William Yellen | 42 | Head | Proprietor | Poland |
| 37 | Rebecca @ Yellen | 42 | Wife | — | Poland |
| 38 | Sarah Yellen | 14 | Daughter | Office Work | France |
| 39 | Morris Yellen | 18 | Son | — | New Jersey |
| 40 | Rose Yellen | 17 | Daughter | — | New Jersey |
Pedigree Summary
Robert
Gen 1 · 3 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)