FD
Frank Day — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Frank Day across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1904), then head of a 8-person household.
Age 36
b. ~1904
Male
Head
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Day |
| Given Name | Frank |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 36 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Electrician |
| Industry | Gum Mfg. Co. |
| Class of Worker | PW |
| Hours Worked | 42 |
| Income (1939) | 2510 |
| Highest Grade | H 3 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Electrician |
| Township / Ward | Chicago |
| Est. Birth Year | ~1904 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Frank | Age | Birth yr |
|---|---|---|---|---|
| Frank Day | Head | — | 36 | ~1904 |
| Richard Day | Son | — | 8 | ~1932 |
| Donald Day | Son | — | 10 | ~1930 |
| Dorothy Day | Daughter | — | 12 | ~1928 |
| Frank Day | Son | — | 9 | ~1931 |
| Claire Day | Daughter | — | 5 | ~1935 |
| Emily Day | Spouse | — | 36 | ~1904 |
| Caroline Day | Daughter | — | 3 | ~1937 |
Census Appearances
1930
Cook, Illinois
Son, age 21
Cook, Illinois · implied b. ~1909 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Day |
| Given Name | Frank R |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | Operator |
| Industry | Telephone |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Head, age 36
Cook-County, Illinois · implied b. ~1904 — 8 household members
| Surname | Day |
| Given Name | Frank |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 36 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Occupation | Electrician |
| Industry | Gum Mfg. Co. |
| Class of Worker | PW |
| Hours Worked | 42 |
| Income (1939) | 2510 |
| Highest Grade | H 3 |
| 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 Frank Day across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Frank Day
Head · 1940 · age 36 · b. ~1904 · Illinois
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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-t0627-00947-00532)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Helen Hillock | 10 | Daughter | — | Illinois |
| 42 | Anna M. Hillock | 9 | Daughter | — | Illinois |
| 43 | James Hillock | 7 | Son | — | Illinois |
| 44 | George Hillock | 5 | Son | — | Illinois |
| 45 | Loretta Hillock | 2 | Daughter | — | Illinois |
| 46 | Bartosz Sabina | 24 | Sister-in-law | Factory Hand | Illinois |
| 47 | Richard Sies | 34 | Head | Shipping Clerk | Illinois |
| 48 | Bernice Sies | 27 | Wife | Stenographer | Illinois |
| 49 | Bernard Jankun | 64 | Father-in-law | — | Poland |
| 50 | Robert O'Brien | 45 | Head | Deputy Sheriff | Illinois |
| 51 | Minnie O'Brien | 47 | Wife | — | Ireland |
| 52 | Robert O'Brien | 23 | Son | Skilled Laborer | Illinois |
| 53 | Harold O'Brien | 22 | Son | Truck Driver | Illinois |
| 54 | George O'Brien | 21 | Son | Office Boy | Illinois |
| 55 | Mary O'Brien | 18 | Daughter | Clerk | Illinois |
| 56 | John O'Brien | 17 | Son | — | Illinois |
| 57 | Dorothy O'Brien | 15 | Daughter | — | Illinois |
| 58 | Lawrence O'Brien | 14 | Daughter | — | Illinois |
| 59 | Francis O'Brien | 9 | Son | — | Illinois |
| 60 | Rita O'Brien | 8 | Daughter | — | Illinois |
| 61 | John Bevan | 49 | Head | Truck Driver | Illinois |
| 62 | Mae Bevan | 43 | Wife | Mailer | Illinois |
| 63 | Violet Bevan | 20 | Daughter | Clerk | Illinois |
| 64 | Walter J. Martinese | 32 | Head | Elevator Operator | Illinois |
| 65 | Florence Martinese | 34 | Wife | Water Cooler Operator | Illinois |
| 66 | Harriet Martinese | 15 | Daughter | — | Illinois |
| 67 | Genevieve Martinese | 14 | Daughter | — | Illinois |
| 68 | Cecelia Martinese | 12 | Daughter | — | Illinois |
| 69 | Frances Martinese | 4 | Daughter | — | Illinois |
| 70 | Marjorie Martinese | 4 | Daughter | — | Illinois |
| 71 | William J. Winters | 63 | Father-in-law | — | Illinois |
| 72 | Elena Winters | 63 | Mother-in-law | — | New York |
| 73 | Frank Day THIS PERSON | 36 | Head | Electrician | Illinois |
| 74 | Emily Day | 36 | Wife | — | Illinois |
| 75 | Dorothy Day | 12 | Daughter | — | Illinois |
| 76 | Donald Day | 10 | Son | — | Illinois |
| 77 | Frank Day | 9 | Son | — | Illinois |
| 78 | Richard Day | 8 | Son | — | Illinois |
| 79 | Claire Day | 5 | Daughter | — | Illinois |
| 80 | Caroline Day | 3 | Daughter | — | Illinois |
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)