RB
Robert Blair — 1940 US Census Record
Model Tree available1940 United States Federal Census · Denver-County, Colorado
Our Model Tree links this Robert Blair across the 1920, 1930 and 1940 US Censuses in Denver-County, Colorado (XGBoost, ~Confirmed), with identified parents Minnie — first a son (b.~1918), then head of a 4-person household.
Age 22
b. ~1918
Male
Son
Born: Missouri
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Denver-County, Colorado |
| Surname | Blair |
| Given Name | Robert W. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Missouri |
| 1935 Residence (City) | Denver |
| 1935 Residence (County) | Denver |
| Additional Details | |
| Occupation | Ski Teacher-Geologist |
| Industry | U.S. Forest Service-Survey-Mining |
| Class of Worker | GW |
| Income (1939) | 840 |
| Highest Grade | C-4 |
| 1935 Residence | Same Place |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
| Occupation | Ski Teacher-Geologist |
| Township / Ward | Denver |
| Est. Birth Year | ~1918 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Robert | Age | Birth yr |
|---|---|---|---|---|
| Velma Bowers | Other | — | 26 | ~1914 |
| Robert Blair | Son | — | 22 | ~1918 |
| Minnie Blair | Head | — | 47 | ~1893 |
| John Blair | Son | — | 18 | ~1922 |
Census Appearances
1920
Denver, Colorado
Other, age 2
Denver, Colorado · implied b. ~1918 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Blair |
| Given Name | Robert W |
| Relationship to Head | Boarder |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Missouri |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Arizona |
| Speaks English | Yes |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
1930
Denver, Colorado
Son, age 13
Denver, Colorado · implied b. ~1917 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Blair |
| Given Name | Robert W |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Missouri |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Arizona |
| Can Read/Write | Yes |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
1940
Denver-County, Colorado
Son, age 22
Denver-County, Colorado · implied b. ~1918 — 4 household members
| Surname | Blair |
| Given Name | Robert W. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Missouri |
| 1935 Residence (City) | Denver |
| 1935 Residence (County) | Denver |
| Occupation | Ski Teacher-Geologist |
| Industry | U.S. Forest Service-Survey-Mining |
| Class of Worker | GW |
| Income (1939) | 840 |
| Highest Grade | C-4 |
| 1935 Residence | Same Place |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
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. Identified parents: mother Minnie Blair (~0.92 confidence). The pedigree spans 1 generation with 1 identified ancestor.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Minnie Blair
b. ~1893
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Robert Blair
Son · 1940 · age 22 · b. ~1918 · Colorado
★ You are viewing this record
Sibling
John Blair
Sibling · 1940 · age 18
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 — Denver-County, Colorado
Open full size
1940 US Federal Census — Denver-County, Colorado
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00487-00689)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Betty Dolores Patty | 32 | Wife | 0 | Colorado |
| 42 | Carl J. Patty | 10 | Son | — | Colorado |
| 43 | Neil B. Patty | 1 | Son | — | Colorado |
| 44 | Jean W. X. Patty | 0 | Daughter | — | Colorado |
| 45 | Olva G. Reed | 45 | Head | Clerk | Iowa |
| 46 | Ruby G. Reed | 45 | Wife | 0 | Missouri |
| 47 | Donald E. Reed | 13 | Son | — | Colorado |
| 48 | Sherman B. Grimes | 31 | Head | Clerk | Oklahoma |
| 49 | Mildred M. Grimes | 23 | Wife | Beauty Operator | Illinois |
| 50 | William B. Grimes | 1 | Son | — | Colorado |
| 51 | Laura E. Dillon | 45 | Head | Owner | Illinois |
| 52 | Zella E. Spears | 59 | Head | 0 | Illinois |
| 53 | Edgar E. Spears | 15 | Nephew | 0 | Colorado |
| 54 | James C. Henry | 79 | Lodger | 0 | Missouri |
| 55 | Ruby La Rue | 48 | Head | 0 | Indiana |
| 56 | Kathryn Wickert | 35 | Sister | Practical Nurse | Indiana |
| 57 | Roland O. Murphy | 28 | Head | Salesman | Texas |
| 58 | Mary C. Murphy | 31 | Wife | 0 | Texas |
| 59 | Patricia A. Murphy | 2 | Daughter | — | Illinois |
| 60 | Lillian F. Maloney | 20 | Sister-in-law | Stenographer | Texas |
| 61 | Edward E. Polanis | 33 | Head | Salesman | Connecticut |
| 62 | Laura Ma Polanis | 33 | Wife | 0 | Colorado |
| 63 | Raymond J. Polanis | 6 | Son | — | Colorado |
| 64 | John J. Quinn | 74 | Head | Watchman | Illinois |
| 65 | Louie Quinn | 61 | Wife | 0 | Missouri |
| 66 | Quinn J. Quinn | 26 | Son | Clerk | Nebraska |
| 67 | Henry S. Canby | 64 | Head | Medical Doctor | Oregon |
| 68 | Eleanor V. Canby | 53 | Wife | 0 | Germany |
| 69 | Cecil C. Canby | 21 | Daughter | Secretary | Colorado |
| 70 | Joel S. Canby | 22 | Son | 0 | Colorado |
| 71 | Minnie D. Blair | 47 | Head | 0 | Arizona |
| 72 | Robert W. Blair THIS PERSON | 22 | Son | Ski Teacher-Geologist | Missouri |
| 73 | John W. Blair | 18 | Son | — | California |
| 74 | Velma N. Bowers | 26 | Lodger | Maid | Nebraska |
| 75 | Guy H. Farrall | 53 | Head | Topographic Engineer | South Dakota |
| 76 | Lottie W. Farrall | 55 | Wife | 0 | Colorado |
| 77 | George A. Tracy | 31 | Head | Lineman | Colorado |
| 78 | Lenora A. Tracy | 30 | Wife | 0 | Missouri |
| 79 | Louise G. Tracy | 9 | Daughter | — | Colorado |
| 80 | George Tracy | 70 | Father | 0 | England |
Pedigree Summary
Robert + 1 sibling
Gen 1 · 1 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)