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Mary Mason — 1940 US Census Record
Model Tree available1940 United States Federal Census · Baltimore-City-County, Maryland
Our Model Tree links this Mary Mason across the 1920, 1930 and 1940 US Censuses in Baltimore-City-County, Maryland (XGBoost, ~Confirmed), with identified parents David & Robert — first a daughter (b.~1910), then head of a 4-person household.
Age 30
b. ~1910
Female
Daughter
Born: Virginia
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Baltimore-City-County, Maryland |
| Surname | Mason |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 30 |
| Marital Status | Married |
| Birthplace | Virginia |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| Additional Details | |
| Hours Worked | 0 |
| Highest Grade | No 3 |
| 1935 Residence | Same place |
| Birth State | Virginia |
| Birth Country | United States |
| Birthplace (normalized) | virginia |
| Township / Ward | Baltimore City |
| Est. Birth Year | ~1910 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Mason | Daughter | — | 30 | ~1910 |
| Clarence Clayton | Head | — | 57 | ~1883 |
| Major Mason | Other | — | 42 | ~1898 |
| Alice Clayton | Spouse | — | 49 | ~1891 |
Census Appearances
1920
Prince Georges, …
Daughter, age 11
Prince Georges, Maryland · implied b. ~1909 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mason |
| Given Name | Marie |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Virginia |
| Father's Birthplace | Virginia |
| Mother's Birthplace | Virginia |
| Can Read | No |
| Can Write | No |
| Speaks English | Yes |
| Birth State | Virginia |
| Birth Country | United States |
| Birthplace (normalized) | virginia |
1930
Baltimore, Maryland
Daughter, age 21
Baltimore, Maryland · implied b. ~1909 — 13 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mason |
| Given Name | Marie |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Virginia |
| Father's Birthplace | Virginia |
| Mother's Birthplace | Virginia |
| Occupation | Housework |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Virginia |
| Birth Country | United States |
| Birthplace (normalized) | virginia |
1940
Baltimore-City-County, Maryland
Daughter, age 30
Baltimore-City-County, Maryland · implied b. ~1910 — 4 household members
| Surname | Mason |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 30 |
| Marital Status | Married |
| Birthplace | Virginia |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| Hours Worked | 0 |
| Highest Grade | No 3 |
| 1935 Residence | Same place |
| Birth State | Virginia |
| Birth Country | United States |
| Birthplace (normalized) | virginia |
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 Mason across 3 US Census years (1920, 1930 and 1940) in 3 locations, using XGBoost record linkage. Identified parents: father David Mason (~0.92 confidence) and father Robert Mason (~0.92 confidence) and father Clarence Clayton (~0.92 confidence) and mother Lulu Mason (~0.92 confidence) and mother Cora Mason (~0.92 confidence) and mother Alice Clayton (~0.92 confidence). The pedigree spans 1 generation with 6 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
David Mason
b. ~1881
Source father
● Household
· direct · ~0.92
Father
Robert Mason
b. ~1882
Source father
● Household
· direct · ~0.92
Father
Clarence Clayton
b. ~1883
Source father
● Household
· direct · ~0.92
Mother
Lulu Mason
b. ~1883
Source mother
● Household
· direct · ~0.92
Mother
Cora Mason
b. ~1890
Source mother
● Household
· direct · ~0.92
Mother
Alice Clayton
b. ~1891
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Mason
Daughter · 1940 · age 30 · b. ~1910 · Maryland
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Baltimore-City-County, Maryland
Open full size
1940 US Federal Census — Baltimore-City-County, Maryland
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01529-00020)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Thomas Marshall | 2 | Son | — | Maryland |
| 42 | Harvey Marshall | 0 | Son | — | Maryland |
| 43 | Eliza Cooper | 39 | Sister | — | Maryland |
| 44 | George Gordon | 36 | Head | Chauffeur | Maryland |
| 45 | Grace Gordon | 40 | Wife | Domestic | Virginia |
| 46 | Edward Lewis | 24 | Lodger | Helper | Virginia |
| 47 | Josephine Savoy | 10 | Niece | — | Maryland |
| 48 | Paul Carkery | 55 | Head | Waiter | Maryland |
| 49 | Helen Carkery | 44 | Wife | Maid | Maryland |
| 50 | Lydia Cooper | 19 | Lodger | Maid | Maryland |
| 51 | Cadwell Cooper | 2 | Lodger | — | Maryland |
| 52 | George Garden | 35 | Lodger | Porter | Maryland |
| 53 | Mable Barnes | 70 | Head | — | Maryland |
| 54 | Clyde Jones | 74 | Lodger | — | Maryland |
| 55 | Annie Williams | 56 | Lodger | Cook | Florida |
| 56 | Hellar Smith | 39 | Head | Manager | North Carolina |
| 57 | Henrietta Maxwell | 16 | Daughter | Maid | Maryland |
| 58 | Curtis Cooke | 36 | Lodger | Musician | Louisiana |
| 59 | Luella Mccullough | 34 | Lodger | Domestic | South Carolina |
| 60 | Dorothy Logan | 43 | Head | — | Maryland |
| 61 | Lavernia Logan | 18 | Daughter | — | Maryland |
| 62 | Robert Logan | 16 | Son | — | Maryland |
| 63 | Dorothy Logan | 12 | Daughter | — | Maryland |
| 64 | Douglas Logan | 8 | Son | — | Maryland |
| 65 | Clarence Clayton | 57 | Head | Laborer | Virginia |
| 66 | Alice Clayton | 49 | Wife | Domestic | Virginia |
| 67 | Mary Mason THIS PERSON | 30 | Daughter | — | Virginia |
| 68 | Major Mason | 42 | Son-in-law | Custodian | North Carolina |
| 69 | James Hawkins | 39 | Head | Filer | North Carolina |
| 70 | Johnnie Hawkins | 20 | Wife | — | Virginia |
| 71 | Bennie Hawkins | 1 | Daughter | — | Maryland |
| 72 | Ruth Bertha | 35 | Sister | Domestic | North Carolina |
| 73 | Line Extra | None | — | — | — |
| 74 | Mary Benson | 31 | Head | — | North Carolina |
| 75 | Ruth Penick | 17 | Daughter | — | South Carolina |
| 76 | York Price | 45 | Lodger | Cook | Florida |
| 77 | Charles Roberts | 50 | Head | — | Maryland |
| 78 | Mary Roberts | 49 | Wife | Domestic | Maryland |
| 79 | Charles Jr. Roberts | 20 | Son | Laborer | Maryland |
| 80 | Andrew Scott | 43 | Head | Laborer | Virginia |
Pedigree Summary
Mary
Gen 1 · 6 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)