RB
Robert Blair — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Knott-County, Kentucky
Our Model Tree links this Robert Blair across the 1920, 1930 and 1940 US Censuses in Knott-County, Kentucky (XGBoost, ~Confirmed) — first a head (b.~1885), then head of a 7-person household.
Age 55
b. ~1885
Male
Head
Born: Kentucky
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Knott-County, Kentucky |
| Surname | Blair |
| Given Name | Robert |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 55 |
| Marital Status | Married |
| Birthplace | Kentucky |
| 1935 Residence (City) | Magisterial District no. 2 |
| 1935 Residence (County) | Knott |
| Additional Details | |
| Occupation | Miner |
| Industry | Coal mine |
| Class of Worker | PW |
| Hours Worked | 28 |
| Income (1939) | 600 |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
| Occupation | Miner |
| Township / Ward | Magisterial District No 2 |
| Est. Birth Year | ~1885 |
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 |
|---|---|---|---|---|
| Polly Blair | Other | — | 53 | ~1887 |
| Robert Blair | Head | — | 55 | ~1885 |
| Sim Blair | Son | — | 11 | ~1929 |
| Barbara Blair | Spouse | — | 41 | ~1899 |
| Damon Blair | Son | — | 17 | ~1923 |
| Sylvester Blair | Son | — | 15 | ~1925 |
| Delbert Blair | Son | — | 20 | ~1920 |
Census Appearances
1920
Knott, Kentucky
Head, age 34
Knott, Kentucky · implied b. ~1886 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Blair |
| Given Name | Robert |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 34 |
| Marital Status | Married |
| Birthplace | Kentucky |
| Father's Birthplace | Kentucky |
| Mother's Birthplace | Kentucky |
| Occupation | Farmer |
| Industry | General Farm |
| Class of Worker | OA |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | R |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
1930
Knott, Kentucky
Head, age 43
Knott, Kentucky · implied b. ~1887 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Blair |
| Given Name | Robert |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 43 |
| Marital Status | Married |
| Birthplace | Kentucky |
| Age at First Marriage | 17 |
| Father's Birthplace | Kentucky |
| Mother's Birthplace | Kentucky |
| Occupation | Farmer |
| Industry | Gen farm |
| Class of Worker | OA |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 375 |
| Veteran | No |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
1940
Knott-County, Kentucky
Head, age 55
Knott-County, Kentucky · implied b. ~1885 — 7 household members
| Surname | Blair |
| Given Name | Robert |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 55 |
| Marital Status | Married |
| Birthplace | Kentucky |
| 1935 Residence (City) | Magisterial District no. 2 |
| 1935 Residence (County) | Knott |
| Occupation | Miner |
| Industry | Coal mine |
| Class of Worker | PW |
| Hours Worked | 28 |
| Income (1939) | 600 |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
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 Blair 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 Blair
Head · 1940 · age 55 · b. ~1885 · Kentucky
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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 — Knott-County, Kentucky
Open full size
1940 US Federal Census — Knott-County, Kentucky
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01326-00338)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Mary Francis | 44 | Sister | — | Kentucky |
| 2 | Willie Brown | 23 | Head | Miner | Kentucky |
| 3 | Cora Brown | 19 | Wife | — | Kentucky |
| 4 | Clora Brown | 1 | Daughter | — | Kentucky |
| 5 | John W. Witt | 31 | Head | Miner | Kentucky |
| 6 | Lida Witt | 27 | Wife | — | Kentucky |
| 7 | Reva G. Witt | 7 | Daughter | — | Kentucky |
| 8 | Ruth G. Witt | 5 | Daughter | — | Kentucky |
| 9 | Thomas J. Witt | 74 | Father | — | Virginia |
| 10 | Elizabeth Witt | 73 | Mother | — | Virginia |
| 11 | Joe Brown | 46 | Head | Farmer | Kentucky |
| 12 | Betty Brown | 45 | Wife | — | Kentucky |
| 13 | Irvin Brown | 19 | Son | Miner | Kentucky |
| 14 | Martha Brown | 17 | Daughter | — | Kentucky |
| 15 | Joe Jr. Brown | 15 | Son | — | Kentucky |
| 16 | Beulah Brown | 13 | Daughter | — | Kentucky |
| 17 | Judy Brown | 9 | Daughter | — | Kentucky |
| 18 | Edna Brown | 7 | Daughter | — | Kentucky |
| 19 | Walden Brown | 5 | Son | — | Kentucky |
| 20 | Gordon Brown | 35 | Head | — | Kentucky |
| 21 | Ollie Brown | 34 | Wife | — | Kentucky |
| 22 | John W. Cordill | 61 | Head | Farmer | Kentucky |
| 23 | Polly Cordill | 57 | Wife | — | Kentucky |
| 24 | Melvin Cordill | 27 | Son | Miner | Kentucky |
| 25 | Dicie Cordill | 24 | Daughter | House Work | Kentucky |
| 26 | Stella Cordill | 17 | Daughter | — | Kentucky |
| 27 | Annie Cordill | 14 | Daughter | — | Kentucky |
| 28 | Tilden Cordill | 29 | Head | Miner | Kentucky |
| 29 | Martha Cordill | 22 | Wife | — | Kentucky |
| 30 | Wilma L. Cordill | 2 | Daughter | — | Kentucky |
| 31 | Shelby Cordill | 1 | Son | — | Kentucky |
| 32 | Robert Blair THIS PERSON | 55 | Head | Miner | Kentucky |
| 33 | Barbara Blair | 41 | Wife | — | Kentucky |
| 34 | Delbert Blair | 20 | Son | Miner | Kentucky |
| 35 | Damon Blair | 17 | Son | Labour | Kentucky |
| 36 | Sylvester Blair | 15 | Son | — | Kentucky |
| 37 | Sim Blair | 11 | Son | — | Kentucky |
| 38 | Polly A. Blair | 53 | Sister | — | Kentucky |
| 39 | Steve H. Brown | 58 | Head | Labour | Kentucky |
| 40 | Malinda Brown | 53 | Wife | — | Kentucky |
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)