RB
Robert Blair — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Washington-County, Maryland
Our Model Tree links this Robert Blair across the 1930 and 1940 US Censuses in Washington-County, Maryland (XGBoost, ~Confirmed) — first a son (b.~1925), then head of a 10-person household.
Age 15
b. ~1925
Male
Son
Born: Maryland
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Washington-County, Maryland |
| Surname | Blair |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Conococheague |
| 1935 Residence (County) | Washington |
| Additional Details | |
| Highest Grade | No 5 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Conococheague |
| Est. Birth Year | ~1925 |
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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Robert | Age | Birth yr |
|---|---|---|---|---|
| Ruthie Blair | Daughter | — | 5 | ~1935 |
| Vernette Blair | Spouse | — | 47 | ~1893 |
| Harry Blair | Son | — | 13 | ~1927 |
| Helen Blair | Daughter | — | 11 | ~1929 |
| Rolin Blair | Son | — | 17 | ~1923 |
| Richard Blair | Son | — | 20 | ~1920 |
| Frederick Blair | Son | — | 19 | ~1921 |
| Ray Blair | Son | — | 9 | ~1931 |
| Robert Blair | Son | — | 15 | ~1925 |
| Russel Blair | Head | — | 45 | ~1895 |
Census Appearances
1930
Washington, Maryland
Son, age 4
Washington, Maryland · implied b. ~1926 — 8 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 | 4 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Washington-County, Maryland
Son, age 15
Washington-County, Maryland · implied b. ~1925 — 10 household members
| Surname | Blair |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Conococheague |
| 1935 Residence (County) | Washington |
| Highest Grade | No 5 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
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 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Robert Blair
Son · 1940 · age 15 · b. ~1925 · Maryland
★ You are viewing this record
Sibling
Harry Blair
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rolin Blair
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Blair
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Richard Blair
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ruthie Blair
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frederick Blair
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ray Blair
Sibling · 1940 · age 9
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 — Washington-County, Maryland
Open full size
1940 US Federal Census — Washington-County, Maryland
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01562-00465)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Morena Bello | 59 | Head | — | Maryland |
| 2 | Angelo Bello | 21 | Son | Laborer | Maryland |
| 3 | Virgie Bello | 18 | Daughter | Maid | Maryland |
| 4 | Ross Harbaugh | 43 | Head | Machinist | Maryland |
| 5 | Russell Harbaugh | 21 | Son | Driver | Maryland |
| 6 | Pauline Harbaugh | 14 | Daughter | — | Maryland |
| 7 | Annie Harbaugh | 43 | Wife | — | Maryland |
| 8 | Elaine Harbaugh | 6 | Daughter | — | Maryland |
| 9 | Carole Quigley | 1 | Grand-daughter | — | Maryland |
| 10 | Fred Meyers | 31 | Head | Farmer | Maryland |
| 11 | Margaret Meyers | 29 | Wife | — | Maryland |
| 12 | Sallie Meyers | 65 | Mother | — | Maryland |
| 13 | W. T. Springer | 69 | Head | Farmer | Maryland |
| 14 | Louise Springer | 66 | Wife | — | Maryland |
| 15 | Joseph Springer | 20 | Son | Copper | Maryland |
| 16 | Edna Springer | 15 | Daughter | — | Maryland |
| 17 | M. L. Hollinger | 46 | Head | Carpenter | Maryland |
| 18 | Daisy V. Hollinger | 37 | Wife | — | Maryland |
| 19 | Martha Hollinger | 19 | Daughter | — | Maryland |
| 20 | Charles Hollinger | 15 | Son | — | Maryland |
| 21 | Marvin Hollinger | 11 | Son | — | Maryland |
| 22 | John Wm Smith | 66 | Head | Farmer | Maryland |
| 23 | Elizabeth Smith | 62 | Wife | — | Maryland |
| 24 | Edgar Shellenberger | 31 | Head | Baker | Pennsylvania |
| 25 | Alaya Shellenberger | 25 | Wife | — | Iowa |
| 26 | John Snider | 14 | Adopted | — | Kansas |
| 27 | Russel Blair | 45 | Head | Foreman | Maryland |
| 28 | Vernette Blair | 47 | Wife | — | Maryland |
| 29 | Richard Blair | 20 | Son | Laborer | Maryland |
| 30 | Frederick Blair | 19 | Son | Laborer | Maryland |
| 31 | Rolin Blair | 17 | Son | — | Maryland |
| 32 | Robert Blair THIS PERSON | 15 | Son | — | Maryland |
| 33 | Harry Blair | 13 | Son | — | Maryland |
| 34 | Helen Blair | 11 | Daughter | — | Maryland |
| 35 | Ray Blair | 9 | Son | — | Maryland |
| 36 | Ruthie Blair | 5 | Daughter | — | Maryland |
| 37 | Egert-Paul Rambaugh | 21 | Head | Laborer | Pennsylvania |
| 38 | Jean Rambaugh | 16 | Wife | — | Pennsylvania |
| 39 | John Rambaugh | 15 | Brother | Laborer | Pennsylvania |
| 40 | Mary Rambaugh | 13 | Sister | — | Pennsylvania |
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)