MB
Mary Blair — 1940 US Census Record
Model Tree available1940 United States Federal Census · Baltimore-County, Maryland
Our Model Tree links this Mary Blair across the 1920, 1930 and 1940 US Censuses in Baltimore-County, Maryland (XGBoost, ~Confirmed), with identified parents Anna & James — first a daughter (b.~1918), then head of a 5-person household.
Age 22
b. ~1918
Female
Daughter
Born: Maryland
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Baltimore-County, Maryland |
| Surname | Blair |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Election District 2 |
| 1935 Residence (County) | Baltimore |
| Additional Details | |
| Occupation | stenographer |
| Industry | hotel |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 780 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same house |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Occupation | Stenographer |
| Township / Ward | Election District 2 |
| 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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Blair | Daughter | — | 22 | ~1918 |
| Josephine Blair | Daughter | — | 12 | ~1928 |
| Robert Blair | Son | — | 14 | ~1926 |
| Leo Blair | Son | — | 18 | ~1922 |
| Anna Blair | Spouse | — | 55 | ~1885 |
Census Appearances
1920
Baltimore, Maryland
Daughter, age
Baltimore, Maryland · implied b. ~1920 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Blair |
| Given Name | Mary H. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1930
Baltimore, Maryland
Daughter, age 10
Baltimore, Maryland · implied b. ~1920 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Blair |
| Given Name | Mary A. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Can Read/Write | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Baltimore-County, Maryland
Daughter, age 22
Baltimore-County, Maryland · implied b. ~1918 — 5 household members
| Surname | Blair |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Election District 2 |
| 1935 Residence (County) | Baltimore |
| Occupation | stenographer |
| Industry | hotel |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 780 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same house |
| 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 Mary Blair across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Anna Blair (~0.92 confidence) and father James Blair (~0.92 confidence) and father James Blair (~0.92 confidence) and mother Phyllis Blair (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Anna Blair
b. ~1885
Source mother
● Household
· direct · ~0.92
Father
James Blair
b. ~1889
Source father
● Household
· direct · ~0.92
Father
James Blair
b. ~1891
Source father
● Household
· direct · ~0.92
Mother
Phyllis Blair
b. ~1893
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Blair
Daughter · 1940 · age 22 · b. ~1918 · Maryland
★ You are viewing this record
Sibling
Josephine Blair
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Blair
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Leo 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 — Baltimore-County, Maryland
Open full size
1940 US Federal Census — Baltimore-County, Maryland
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01503-00634)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Anna Blair | 55 | wife | — | Maryland |
| 42 | Mary Blair THIS PERSON | 22 | daughter | Stenographer | Maryland |
| 43 | Leo Blair | 18 | son | — | Maryland |
| 44 | Robert Blair | 14 | son | — | Maryland |
| 45 | Josephine Blair | 12 | daughter | — | Maryland |
| 46 | Edwin Emmel | 44 | head | Farmer | Maryland |
| 47 | Emma Emmel | 45 | wife | — | Maryland |
| 48 | George Randall | 60 | head | — | Maryland |
| 49 | Mary Randall | 65 | sister | — | Maryland |
| 50 | Purcell Grafton | 39 | head | Laborer | Maryland |
| 51 | Viola Grafton | 40 | wife | — | Maryland |
| 52 | Elizabeth Grafton | 16 | daughter | — | Maryland |
| 53 | William Grafton | 20 | son | Laborer | Maryland |
| 54 | Irene Grafton | 9 | daughter | — | Maryland |
| 55 | John Grafton | 5 | son | — | Maryland |
| 56 | Walter Grafton | 0 | son | — | Maryland |
| 57 | William Inman | 52 | lodger | Laborer | Virginia |
| 58 | Lillian Grafton | 15 | sister | — | Maryland |
| 59 | Samuel Redmond | 23 | head | Laborer | Maryland |
| 60 | Florence Redmond | 18 | wife | — | Maryland |
| 61 | John Randall | 64 | head | — | Maryland |
| 62 | Kenneth Bailey | 29 | head | Carpenter | Maryland |
| 63 | Mary Bailey | 26 | wife | — | Maryland |
| 64 | Mary Bailey | 7 | daughter | — | Maryland |
| 65 | Kenneth Bailey | 4 | son | — | Maryland |
| 66 | William Bailey | 1 | son | — | Maryland |
| 67 | Gilbert Allen | 73 | head | — | Maryland |
| 68 | Jennie Allen | 70 | wife | — | Maryland |
| 69 | John Nisell | 64 | head | — | Maryland |
| 70 | Christina Nisell | 67 | sister | — | Maryland |
| 71 | Edward Shizer | 51 | head | Painter | Virginia |
| 72 | Mary Shizer | 33 | wife | — | Maryland |
| 73 | Mildred Shizer | 17 | daughter | Domestic | Maryland |
| 74 | Frances Shizer | 15 | daughter | Domestic | Maryland |
| 75 | Edward Shizer | 12 | son | — | Maryland |
| 76 | Larry Shizer | 9 | son | — | Maryland |
| 77 | Bernhard Schwartz | 48 | head | Carpenter | Iowa |
| 78 | Eleanor Schwartz | 42 | wife | — | Pennsylvania |
| 79 | Edwina Schwartz | 13 | daughter | — | Maryland |
| 80 | William Schwartz | 11 | son | — | Maryland |
Pedigree Summary
Mary + 3 siblings
Gen 1 · 4 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)