RK
Robert Kerr — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Black-Hawk-County, Iowa
Our Model Tree links this Robert Kerr across the 1930 and 1940 US Censuses in Black-Hawk-County, Iowa (XGBoost, ~Confirmed) — first a son (b.~1920), then head of a 7-person household.
Age 20
b. ~1920
Male
Son
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Black-Hawk-County, Iowa |
| Surname | Kerr |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Lincoln Twp |
| 1935 Residence (County) | Blackhawk |
| Additional Details | |
| Occupation | farm laborer |
| Industry | farm |
| Class of Worker | NP |
| Hours Worked | 84 |
| Income (1939) | 288 |
| Highest Grade | H-4 |
| 1935 Residence | Same house |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Farm Laborer |
| Township / Ward | Lincoln Twp |
| Est. Birth Year | ~1920 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Robert | Age | Birth yr |
|---|---|---|---|---|
| James Kerr | Son | — | 16 | ~1924 |
| Marion Kerr | Daughter | — | 23 | ~1917 |
| Robert Kerr | Head | — | 57 | ~1883 |
| Virginia Kerr | Daughter | — | 18 | ~1922 |
| Robert Kerr | Son | — | 20 | ~1920 |
| Doris Kerr | Daughter | — | 9 | ~1931 |
| Alice Kerr | Spouse | — | 51 | ~1889 |
Census Appearances
1930
Black Hawk, …
Son, age 10
Black Hawk, Iowa · implied b. ~1920 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kerr |
| Given Name | Robert J |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Black-Hawk-County, Iowa
Son, age 20
Black-Hawk-County, Iowa · implied b. ~1920 — 7 household members
| Surname | Kerr |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Lincoln Twp |
| 1935 Residence (County) | Blackhawk |
| Occupation | farm laborer |
| Industry | farm |
| Class of Worker | NP |
| Hours Worked | 84 |
| Income (1939) | 288 |
| Highest Grade | H-4 |
| 1935 Residence | Same house |
| 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 Kerr across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Robert Kerr
Son · 1940 · age 20 · b. ~1920 · Iowa
★ You are viewing this record
Sibling
Virginia Kerr
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marion Kerr
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Doris Kerr
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Kerr
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 — Black-Hawk-County, Iowa
Open full size
1940 US Federal Census — Black-Hawk-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01139-00603)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Alvin Yuska | 13 | Son | — | Iowa |
| 2 | Wesley Yuska | 27 | Head | Farm Operator | Iowa |
| 3 | Florence Yuska | 24 | Wife | — | Iowa |
| 4 | Henry E. Bickett | 54 | Head | Farm Operator | Iowa |
| 5 | Emma Bickett | 59 | Wife | — | Iowa |
| 6 | Mary Jean Bickett | 16 | Daughter | — | Iowa |
| 7 | Milo J. Mastain | 73 | Head | Farm Operator | Illinois |
| 8 | Georgia D. Mastain | 65 | Wife | — | Iowa |
| 9 | Ralph Mash | 23 | Hired | Farm Laborer | Iowa |
| 10 | Robert Kerr | 57 | Head | Farm Operator | Iowa |
| 11 | Alice Kerr | 51 | Wife | — | Iowa |
| 12 | Marion Kerr | 23 | Daughter | Teacher | Iowa |
| 13 | Robert Kerr THIS PERSON | 20 | Son | Farm Laborer | Iowa |
| 14 | Virginia Kerr | 18 | Daughter | — | Iowa |
| 15 | James Kerr | 16 | Son | — | Iowa |
| 16 | Doris Kerr | 9 | Daughter | — | Iowa |
| 17 | James Kubik | 47 | Head | Farm Operator | Iowa |
| 18 | Marjorie Kubik | 35 | Wife | — | Iowa |
| 19 | Barbara Joe Kubik | 3 | Daughter | — | Iowa |
| 20 | Jacque Marie Kubik | 1 | Daughter | — | Iowa |
| 21 | Delma Sheehan | 43 | Maid | Maid | Iowa |
| 22 | Peter Hansen | 65 | Hired man | Farm Laborer | Denmark |
| 23 | Robert Smith | 48 | Head | Farm Operator | Nebraska |
| 24 | Mary Smith | 50 | Wife | — | Iowa |
| 25 | Harry Grathwohl | 35 | Hired man | Farm Laborer | Illinois |
| 26 | Lillian Kerr | 52 | Head | — | Iowa |
| 27 | Thomas Kerr | 13 | Son | — | Iowa |
| 28 | Oscar Jensen | 24 | Hired man | Farm Laborer | Iowa |
| 29 | John Mastain | 67 | Head | Farm Operator | Illinois |
| 30 | Florence Mastain | 68 | Wife | — | Kentucky |
| 31 | Alfred Petersen | 62 | Head | Farm Operator | Denmark |
| 32 | Anna Petersen | 58 | Wife | — | Denmark |
| 33 | Gordon Jorgensen | 19 | Hired man | Farm Laborer | Iowa |
| 34 | Elsie Outram | 15 | Daughter | — | Iowa |
| 35 | Nels Jensen | 63 | Head | Farm Operator | Denmark |
| 36 | Sophia Jensen | 60 | Wife | — | Denmark |
| 37 | Otto Jensen | 21 | Son | Farm Laborer | Iowa |
| 38 | Lester Sternberger | 27 | Head | Farm Operator | Iowa |
| 39 | Catherine Sternberger | 24 | Wife | — | Oregon |
| 40 | John Sternberger | 1 | Son | — | Iowa |
Related Census Records
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)