RS
Robert Simpson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Black-Hawk-County, Iowa
Our Model Tree links this Robert Simpson across the 1920, 1930 and 1940 US Censuses in Black-Hawk-County, Iowa (XGBoost, ~Confirmed) — first a head (b.~1871), then head of a 2-person household.
Age 69
b. ~1871
Male
Head
Born: Iowa
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Black-Hawk-County, Iowa |
| Surname | Simpson |
| Given Name | Robert |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 69 |
| Marital Status | Widowed |
| Birthplace | Iowa |
| 1935 Residence (City) | Mt. Vernon |
| 1935 Residence (County) | Black Hawk |
| Additional Details | |
| Occupation | Farm Labor |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 20 |
| Income (1939) | 178 |
| Highest Grade | 8 |
| 1935 Residence | Same House |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Farm Laborer |
| Township / Ward | Mt Vernon |
| Est. Birth Year | ~1871 |
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.
2 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Robert | Age | Birth yr |
|---|---|---|---|---|
| Robert Simpson | Head | — | 69 | ~1871 |
| Leonard Simpson | Son | — | 33 | ~1907 |
Census Appearances
1920
Black Hawk, …
Head, age 49
Black Hawk, Iowa · implied b. ~1871 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Simpson |
| Given Name | Robert |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 49 |
| Marital Status | Married |
| Birthplace | Iowa |
| Father's Birthplace | Ireland |
| Mother's Birthplace | New York |
| Occupation | Farmer |
| Industry | General Farm |
| Class of Worker | OA |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | O |
| Home Free/Mortgaged | F |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Black Hawk, …
Head, age 59
Black Hawk, Iowa · implied b. ~1871 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Simpson |
| Given Name | Robert M |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 59 |
| Marital Status | Married |
| Birthplace | Iowa |
| Age at First Marriage | 27 |
| Father's Birthplace | North Ireland |
| Mother's Birthplace | New York |
| Occupation | Farmer |
| Industry | General Farm |
| Class of Worker | E |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 123 |
| Radio Set | R |
| Veteran | No |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Black-Hawk-County, Iowa
Head, age 69
Black-Hawk-County, Iowa · implied b. ~1871 — 2 household members
| Surname | Simpson |
| Given Name | Robert |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 69 |
| Marital Status | Widowed |
| Birthplace | Iowa |
| 1935 Residence (City) | Mt. Vernon |
| 1935 Residence (County) | Black Hawk |
| Occupation | Farm Labor |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 20 |
| Income (1939) | 178 |
| Highest Grade | 8 |
| 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 Simpson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Robert Simpson
Head · 1940 · age 69 · b. ~1871 · Iowa
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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 — Black-Hawk-County, Iowa
Open full size
1940 US Federal Census — Black-Hawk-County, Iowa
Page Contents
32 people indexed on this census page (nara:1940:m-t0627-01139-00631)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Lucile Mcclure | 7 | Daughter | — | Iowa |
| 42 | Sylvester Ehard | 74 | Lodger | — | Indiana |
| 43 | Donald Thompson | 31 | Head | Farm Labor | Iowa |
| 44 | Naomi Thompson | 30 | Wife | — | Iowa |
| 45 | Jacqueline Thompson | 13 | Daughter | — | Iowa |
| 46 | Geraldine Thompson | 10 | Daughter | — | Iowa |
| 47 | William Rapp | 52 | Head | Farm Labor | Iowa |
| 48 | Kate Rapp | 75 | Mother | — | Iowa |
| 50 | Ray W. Hachitt | 49 | Head | Farm Labor | Iowa |
| 51 | Mable Hachitt | 50 | Wife | — | Illinois |
| 52 | Arlene Hachitt | 20 | Daughter | — | Iowa |
| 53 | Frank Thompson | 52 | Head | Farm Labor | Iowa |
| 54 | Grace Thompson | 54 | Wife | — | Iowa |
| 55 | Lucy Phelps | 76 | Mother-in-law | — | Iowa |
| 56 | Roy Keith | 47 | Head | Farm Labor | Iowa |
| 57 | Anna Keith | 45 | Wife | — | Iowa |
| 58 | Betty Ann Keith | 14 | Daughter | — | Iowa |
| 59 | John Keith | 12 | Son | — | Iowa |
| 60 | Frances Keith | 11 | Daughter | — | Iowa |
| 61 | Earl Marquett | 40 | Head | Farm Labor | Iowa |
| 62 | Florence Marquett | 44 | Wife | — | Iowa |
| 63 | Robert Simpson THIS PERSON | 69 | Head | Farm Labor | Iowa |
| 64 | Leonard Simpson | 33 | Son | Farm Labor | Iowa |
| 65 | Kenneth Patten | 29 | Head | Farm Labor | Illinois |
| 66 | Alice Patten | 29 | Wife | — | Iowa |
| 67 | Marlyn Patten | 8 | Daughter | — | Iowa |
| 68 | Delbert Braniger | 28 | Head | Labor | Iowa |
| 69 | Bess Braniger | 31 | Wife | — | Iowa |
| 70 | Michael Braniger | 1 | Son | — | Iowa |
| 71 | Fred R. Decker | 72 | Head | — | Iowa |
| 72 | Mary Decker | 61 | Wife | — | Iowa |
| 73 | Louis Swinton | 70 | Lodger | — | Iowa |
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)