MT
Mary Thornton — 1940 US Census Record
Model Tree available1940 United States Federal Census · District-Of-Columbia-County, District of Columbia
Our Model Tree links this Mary Thornton across the 1920, 1930 and 1940 US Censuses in District-Of-Columbia-County, District of Columbia (XGBoost, ~Confirmed), with identified parents Nannie & Russell — first a daughter (b.~1918), then head of a 3-person household.
Age 22
b. ~1918
Female
Daughter
Born: Virginia
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | District-Of-Columbia-County, District of Columbia |
| Surname | Thornton |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Virginia |
| 1935 Residence (City) | Washington |
| 1935 Residence (County) | District Of Columbia |
| Additional Details | |
| Occupation | Secretary |
| Industry | Heating Contractor |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 800 |
| Highest Grade | C 4 |
| 1935 Residence | Same house |
| Birth State | Virginia |
| Birth Country | United States |
| Birthplace (normalized) | virginia |
| Occupation | Secretary |
| Township / Ward | Washington |
| 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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Thornton | Daughter | — | 22 | ~1918 |
| Russell Thornton | Head | — | 48 | ~1892 |
| Nannie Thornton | Spouse | — | 49 | ~1891 |
Census Appearances
1920
Washington, District …
Daughter, age 2
Washington, District of Columbia · implied b. ~1918 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thornton |
| Given Name | Mary C. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Virginia |
| Father's Birthplace | Virginia |
| Mother's Birthplace | Virginia |
| Birth State | Virginia |
| Birth Country | United States |
| Birthplace (normalized) | virginia |
1930
Washington, District …
Daughter, age 12
Washington, District of Columbia · implied b. ~1918 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thornton |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Virginia |
| Father's Birthplace | Virginia |
| Mother's Birthplace | Virginia |
| Can Read/Write | Yes |
| Birth State | Virginia |
| Birth Country | United States |
| Birthplace (normalized) | virginia |
1940
District-Of-Columbia-County, District …
Daughter, age 22
District-Of-Columbia-County, District of Columbia · implied b. ~1918 — 3 household members
| Surname | Thornton |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Virginia |
| 1935 Residence (City) | Washington |
| 1935 Residence (County) | District Of Columbia |
| Occupation | Secretary |
| Industry | Heating Contractor |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 800 |
| Highest Grade | C 4 |
| 1935 Residence | Same house |
| 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 Thornton across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Nannie Thornton (~0.92 confidence) and father Russell Thornton (~0.92 confidence) and mother Bessie Thornton (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Nannie Thornton
b. ~1891
Source mother
● Household
· direct · ~0.92
Father
Russell Thornton
b. ~1895
Source father
● Household
· direct · ~0.92
Mother
Bessie Thornton
b. ~1901
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Thornton
Daughter · 1940 · age 22 · b. ~1918 · District of Columbia
★ 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 — District-Of-Columbia-County, District of Columbia
Open full size
1940 US Federal Census — District-Of-Columbia-County, District of Columbia
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00560-00870)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Marie L. Mccabe | 15 | Daughter | — | Ireland |
| 42 | Joan N. Mccabe | 14 | Daughter | — | France |
| 43 | John H. Mccabe | 13 | Son | — | France |
| 44 | Russell M. Thornton | 48 | Head | Owner | Virginia |
| 45 | Nannie Thornton | 49 | Wife | — | Virginia |
| 46 | Mary Thornton THIS PERSON | 22 | Daughter | Secretary | Virginia |
| 47 | Franklin D. Watkins | 36 | Head | Accountant | Virginia |
| 48 | Mary Watkins | 36 | Wife | — | D.C. |
| 49 | Franklin D. Watkins | 3 | Son | — | D.C. |
| 50 | Frances E. Erickson | 52 | Head | Clerk | Pennsylvania |
| 51 | Marjorie Erickson | 44 | Wife | Clerk | New York |
| 52 | Fred L. Burger | 75 | Father-in-law | — | New York |
| 53 | Marie O. Rossman | 66 | Head | Supervisor | New York |
| 54 | Katherine Taylor | 58 | Sister | — | Maryland |
| 55 | Walter E. Smith | 51 | Head | Floor Superintendent | New Jersey |
| 56 | Pearl C. Smith | 43 | Wife | — | New York |
| 57 | Ulrich Case | 41 | Head | Installer | Connecticut |
| 58 | Ida E. Case | 42 | Wife | — | Sweden |
| 59 | Ruth Case | 13 | Daughter | — | New York |
| 60 | W. Wade Barbour | 49 | Head | Asst Superintendent | D.C. |
| 61 | Alice S. Barbour | 41 | Wife | — | Virginia |
| 62 | Mabel F. Mcdowell | 40 | Head | Supply Officer | Ohio |
| 63 | Elizabeth D. Lanning | 53 | Head | Clerk | New Jersey |
| 64 | Byron C. Wemmer | 33 | Head | Asst Supervisor | Pennsylvania |
| 65 | Emily P. Wemmer | 33 | Wife | — | Pennsylvania |
| 66 | Emily Lou Wemmer | 4 | Daughter | — | D.C. |
| 67 | Patricia A. Wemmer | 1 | Daughter | — | D.C. |
| 68 | Clarence G. Richardson | 31 | Head | Insurance Agent | Virginia |
| 69 | Eutha Richardson | 26 | Wife | — | Florida |
| 70 | Nancy G. Richardson | 1 | Daughter | — | D.C. |
| 71 | Harold A. Frella | 36 | Head | Bank Examiner | Pennsylvania |
| 72 | M. Adelaide Frella | 30 | Wife | — | Pennsylvania |
| 73 | Earl A. Frella | 7 | Son | — | Pennsylvania |
| 74 | Fannie C. Anderson | 61 | Head | Clerk | Virginia |
| 75 | Cancelled | None | — | — | — |
| 76 | Marjorie Tidwell | 44 | Head | Bookkeeper | D.C. |
| 77 | Ruth Shepard | 44 | Lodger | Secretary | Iowa |
| 78 | Henrietta S. Marsh | 56 | Head | Clerk | Indiana |
| 79 | Sarah S. Smith | 53 | Sister | Clerk | Indiana |
| 80 | Cancelled | None | — | — | — |
Pedigree Summary
Mary
Gen 1 · 3 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)