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Margaret Thomas — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Calvert-County, Maryland
Our Model Tree links this Margaret Thomas across the 1930 and 1940 US Censuses in Calvert-County, Maryland (XGBoost, ~Confirmed) — first a daughter (b.~1923), then head of a 11-person household.
Age 17
b. ~1923
Female
Daughter
Born: Maryland
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Calvert-County, Maryland |
| Surname | Thomas |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Third Election District |
| 1935 Residence (County) | Calvert |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | Hs 3 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Third Election District |
| Est. Birth Year | ~1923 |
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.
11 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Margaret | Age | Birth yr |
|---|---|---|---|---|
| Almer Thomas | Daughter | — | 16 | ~1924 |
| Erma Thomas | Daughter | — | 8 | ~1932 |
| Ruth Thomas | Daughter | — | 5 | ~1935 |
| Mollie Thomas | Daughter | — | 3 | ~1937 |
| Margaret Thomas | Daughter | — | 17 | ~1923 |
| David Thomas | Head | — | 52 | ~1888 |
| David Thomas | Son | — | 19 | ~1921 |
| Maurice Thomas | Son | — | 15 | ~1925 |
| Robert Thomas | Son | — | 10 | ~1930 |
| Samuel Thomas | Son | — | 12 | ~1928 |
| Grace Thomas | Spouse | — | 48 | ~1892 |
Census Appearances
1930
Calvert, Maryland
Daughter, age 7
Calvert, Maryland · implied b. ~1923 — 13 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Calvert-County, Maryland
Daughter, age 17
Calvert-County, Maryland · implied b. ~1923 — 11 household members
| Surname | Thomas |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Third Election District |
| 1935 Residence (County) | Calvert |
| Class of Worker | 0 |
| Highest Grade | Hs 3 |
| 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 Margaret Thomas across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Margaret Thomas
Daughter · 1940 · age 17 · b. ~1923 · Maryland
★ You are viewing this record
Sibling
Ruth Thomas
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Erma Thomas
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Almer Thomas
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Maurice Thomas
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Samuel Thomas
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
David Thomas
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mollie Thomas
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Thomas
Sibling · 1940 · age 10
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 — Calvert-County, Maryland
Open full size
1940 US Federal Census — Calvert-County, Maryland
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01543-00218)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Arthur Jr Jones | 5 | Son | — | Maryland |
| 2 | Gladys Jones | 4 | Daughter | — | Maryland |
| 3 | Alverta Jones | 3 | Daughter | — | Maryland |
| 4 | Robert Jones | 1 | Son | — | Maryland |
| 5 | Alice Jones | 4 | Grand-daughter | — | Maryland |
| 6 | James R Gross | 21 | Nephew | Laborer | Maryland |
| 7 | David Thomas | 52 | Head | Farmer | Maryland |
| 8 | Grace M Thomas | 48 | Wife | — | Maryland |
| 9 | David Jr Thomas | 19 | Son | Laborer | Maryland |
| 10 | Margaret Thomas THIS PERSON | 17 | Daughter | — | Maryland |
| 11 | Almer L Thomas | 16 | Daughter | — | Maryland |
| 12 | Maurice Thomas | 15 | Son | — | Maryland |
| 13 | Samuel Thomas | 12 | Son | — | Maryland |
| 14 | Robert O Thomas | 10 | Son | — | Maryland |
| 15 | Erma Thomas | 8 | Daughter | — | Maryland |
| 16 | Ruth A Thomas | 5 | Daughter | — | Maryland |
| 17 | Mollie M Thomas | 3 | Daughter | — | Maryland |
| 18 | Henry F Stowns | 54 | Head | Farmer | Maryland |
| 19 | Margaret H Stowns | 57 | Wife | — | Maryland |
| 20 | Margaret E Stowns | 22 | Daughter | Elementary Teacher | Maryland |
| 21 | Murray Reed | 45 | Head | Laborer | Maryland |
| 22 | Florence Reed | 45 | Wife | — | Maryland |
| 23 | Marie Reed | 18 | Daughter | — | Maryland |
| 24 | Winnie Reed | 14 | Daughter | — | Maryland |
| 25 | Evvie Reed | 12 | Daughter | — | Maryland |
| 26 | Webster Reed | 10 | Son | — | Maryland |
| 27 | Walter Reed | 6 | Son | — | Maryland |
| 28 | Edith Moten | 22 | Sister | Waitress | Maryland |
| 29 | Ray E Jones | 10 | Grandson | — | Maryland |
| 30 | Frances Jones | 7 | Grand-daughter | — | Maryland |
| 31 | James Henson | 48 | Head | Laborer | Maryland |
| 32 | Rosie Henson | 45 | Wife | Servant | Maryland |
| 33 | Cephas Randall | 67 | Head | Farmer | Maryland |
| 34 | Charles Harvey | 17 | Grandson | — | Maryland |
| 35 | Wilbur Contee | 14 | Grandson | — | Maryland |
| 36 | Gilbert Jones | 21 | Nephew | Laborer | Maryland |
| 37 | Clement R Smith | 46 | Head | Farmer | Maryland |
| 38 | Laura Smith | 41 | Wife | Servant | Maryland |
| 39 | Henrietta Smith | 15 | Daughter | — | Maryland |
| 40 | Gladys R Smith | 13 | Daughter | — | Maryland |
Related Census Records
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)