RD
Robert Day — 1940 US Census Record
Model Tree available1940 United States Federal Census · Scott-County, Iowa
Our Model Tree links this Robert Day across the 1920, 1930 and 1940 US Censuses in Scott-County, Iowa (XGBoost, ~Confirmed), with identified parents Elmer & Robert — first a head (b.~1914), then head of a 3-person household.
Age 26
b. ~1914
Male
Head
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Scott-County, Iowa |
| Surname | Day |
| Given Name | Robert Lee |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Rock Island |
| 1935 Residence (County) | Rock Island |
| Additional Details | |
| Occupation | Machine operator |
| Industry | Arsenal |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 2000 |
| Highest Grade | C 4 |
| 1935 Residence | Illinois |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Machine Operator |
| Township / Ward | Bettendorf 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 Robert | Age | Birth yr |
|---|---|---|---|---|
| Ronald Day | Son | — | ~1940 | |
| Eleanor Day | Spouse | — | 26 | ~1914 |
| Robert Day | Head | — | 26 | ~1914 |
Census Appearances
1920
Rock Island, …
Son, age 4
Rock Island, Illinois · implied b. ~1916 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Day |
| Given Name | Robert |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Illinois |
| Occupation | none |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Rock Island, …
Son, age 16
Rock Island, Illinois · implied b. ~1914 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Day |
| Given Name | Robert L. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Scott-County, Iowa
Head, age 26
Scott-County, Iowa · implied b. ~1914 — 3 household members
| Surname | Day |
| Given Name | Robert Lee |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Rock Island |
| 1935 Residence (County) | Rock Island |
| Occupation | Machine operator |
| Industry | Arsenal |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 2000 |
| Highest Grade | C 4 |
| 1935 Residence | Illinois |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
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 Elmer Day (~0.92 confidence) and father Robert Day (~0.92 confidence) and mother Cora Day (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Elmer Day
b. ~1894
Source father
● Household
· direct · ~0.92
Father
Robert Day
b. ~1891
Source father
● Household
· direct · ~0.92
Mother
Cora Day
b. ~1895
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Robert Day
Head · 1940 · age 26 · b. ~1914 · Iowa
★ 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 — Scott-County, Iowa
Open full size
1940 US Federal Census — Scott-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01202-00096)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Cyril Cumming | 28 | Head | Crane Operator | Iowa |
| 42 | June Cumming | 21 | Wife | — | Iowa |
| 43 | Ronald Cumming | 2 | Son | — | Iowa |
| 44 | Dennis Cumming | 0 | Son | — | Iowa |
| 45 | William Machalek | 50 | Head | Chipper | Czechoslovakia |
| 46 | Mary Machalek | 53 | Wife | — | Czechoslovakia |
| 47 | Walter Machalek | 25 | Son | Laborer | Iowa |
| 48 | Walter Becker | 29 | Head | Heat Treat | Illinois |
| 49 | Jessie Becker | 27 | Wife | — | Iowa |
| 50 | Earling Engelking | 37 | Head | Packer | Minnesota |
| 51 | Wanda Engelking | 26 | Wife | — | Minnesota |
| 52 | Paul J Vogel | 29 | Head | Bottler | Iowa |
| 53 | Geneva Vogel | 31 | Wife | — | Iowa |
| 54 | Evelyn Vogel | 5 | Daughter | — | Iowa |
| 55 | Albert Jahncke | 44 | Head | Electrician | Iowa |
| 56 | Lucille Jahncke | 34 | Wife | — | Illinois |
| 57 | Shirley Jahncke | 5 | Daughter | — | Iowa |
| 58 | Otto L Truesner | 61 | Head | Laborer | Illinois |
| 59 | Ruth Truesner | 54 | Wife | — | Kansas |
| 60 | Johanna Rodgers | 74 | Mother-in-law | — | Sweden |
| 61 | Frank Kolacia | 46 | Head | Welder | Czechoslovakia |
| 62 | Ludmila Kolacia | 43 | Wife | — | Czechoslovakia |
| 63 | Olga Kolacia | 15 | Daughter | — | Iowa |
| 64 | Robert Lee Day THIS PERSON | 26 | Head | Machine Operator | Iowa |
| 65 | Eleanor Day | 26 | Wife | — | Iowa |
| 66 | Ronald Lee Day | 0 | Son | — | Iowa |
| 67 | Fred Voldaner | 39 | Head | Carpenter | Iowa |
| 68 | Earla Voldaner | 39 | Wife | Presser | Iowa |
| 69 | Archie Lushington | 43 | Head | Tool Maker | Iowa |
| 70 | Eva Lushington | 42 | Wife | — | Iowa |
| 71 | Eufine Lushington | 20 | Daughter | — | Iowa |
| 72 | Jack Lushington | 18 | Son | Apprentice | Iowa |
| 73 | Caroline Lushington | 16 | Daughter | — | Illinois |
| 74 | Dwight Lushington | 14 | Son | — | Illinois |
| 75 | Don Lushington | 12 | Son | — | Iowa |
| 76 | Harlan Lushington | 10 | Son | — | Iowa |
| 77 | Reino Mamer | 28 | Head | Brick Layer | Oregon |
| 78 | Helen Mamer | 27 | Wife | — | Iowa |
| 79 | Dorothy Mamer | 8 | Daughter | — | Texas |
| 80 | Donald Mamer | 5 | Son | — | Texas |
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)