TC
Thomas Clark — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Frederick-County, Maryland
Our Model Tree links this Thomas Clark across the 1920, 1930 and 1940 US Censuses in Frederick-County, Maryland (XGBoost, ~Confirmed) — first a head (b.~1884), then head of a 8-person household.
Age 56
b. ~1884
Male
Head
Born: Maryland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Frederick-County, Maryland |
| Surname | Clark |
| Given Name | Thomas |
| Relationship to Head | head |
| Sex | M |
| Color / Race | White |
| Age | 56 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Election District 22 |
| 1935 Residence (County) | Frederick |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 40 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Occupation | Farmer |
| Township / Ward | Election District 22 |
| Est. Birth Year | ~1884 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Thomas | Age | Birth yr |
|---|---|---|---|---|
| Violet Clark | Daughter | — | 22 | ~1918 |
| Thomas Clark | Head | — | 56 | ~1884 |
| Thomas Clark | Son | — | 29 | ~1911 |
| Lawrence Clark | Son | — | 20 | ~1920 |
| George Clark | Son | — | 26 | ~1914 |
| Leslie Clark | Son | — | 23 | ~1917 |
| W Clark | Son | — | 27 | ~1913 |
| Emma Clark | Spouse | — | 46 | ~1894 |
Census Appearances
1920
Frederick, Maryland
Head, age 34
Frederick, Maryland · implied b. ~1886 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | Thomas |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 34 |
| Marital Status | Married |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | Farmer |
| Industry | General farm |
| Class of Worker | Emp |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | O |
| Home Free/Mortgaged | M |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1930
Frederick, Maryland
Head, age 44
Frederick, Maryland · implied b. ~1886 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | Thomas |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 44 |
| Marital Status | Married |
| Birthplace | Maryland |
| Age at First Marriage | 24 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Maryland |
| Occupation | Farmer |
| Industry | Gen farmer |
| Class of Worker | OA |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Frederick-County, Maryland
Head, age 56
Frederick-County, Maryland · implied b. ~1884 — 8 household members
| Surname | Clark |
| Given Name | Thomas |
| Relationship to Head | head |
| Sex | M |
| Color / Race | White |
| Age | 56 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Election District 22 |
| 1935 Residence (County) | Frederick |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 40 |
| Highest Grade | Hs 4 |
| 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 Thomas Clark across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Thomas Clark
Head · 1940 · age 56 · b. ~1884 · Maryland
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Frederick-County, Maryland
Open full size
1940 US Federal Census — Frederick-County, Maryland
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01548-00511)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Peggy M Mossing | 9 | daughter | — | Maryland |
| 42 | John T Fitzgerald | 77 | father | Farmer | Maryland |
| 43 | Benjamin S Mossing | 70 | father | Farmer | Virginia |
| 44 | Ada S Shoop | 37 | head | Farmer | Maryland |
| 45 | Charles W Delauter | 20 | son | Farmer | Maryland |
| 46 | Anna E Delauter | 12 | daughter | — | Maryland |
| 47 | Robert G Shoop | 2 | son | — | Maryland |
| 48 | Oscar G Delauter | 40 | farm hand | Farmer | Maryland |
| 49 | Austin T Haffner | 65 | head | Farm Manager | Maryland |
| 50 | Jane B Haffner | 54 | wife | — | Maryland |
| 51 | Margie Ambush | 30 | housekeeper | Housekeeper | Maryland |
| 52 | Daniel E O'Bryan | 34 | head | Farmer | Maryland |
| 53 | Bernice E O'Bryan | 30 | wife | — | Maryland |
| 54 | Vernon G O'Bryan | 11 | son | — | Maryland |
| 55 | Albenia E O'Bryan | 10 | daughter | — | Maryland |
| 56 | Alice M O'Bryan | 1 | daughter | — | Maryland |
| 57 | Charles H Umbaugh | 68 | father-in-law | — | Maryland |
| 58 | Carrie V Umbaugh | 58 | mother-in-law | — | Maryland |
| 59 | Floyd M Reeder | 31 | head | Farmer & Dairyman | Maryland |
| 60 | Mary M Reeder | 26 | wife | — | Maryland |
| 61 | R. Martin Reeder | 3 | son | — | Maryland |
| 62 | Stephen R Reeder | 1 | son | — | Maryland |
| 63 | John J Lamb | 30 | head | Farmer & Dairyman | Virginia |
| 64 | Nellie F Lamb | 30 | wife | Farmer & Dairyman | Virginia |
| 65 | Phyllis A Lamb | 10 | daughter | — | Virginia |
| 66 | Muriel J Lamb | 8 | daughter | — | Virginia |
| 67 | Fay L Lamb | 5 | daughter | — | Virginia |
| 68 | James L Lamb | 25 | head | Farmer & Dairyman | Virginia |
| 69 | Helen E Lamb | 25 | wife | — | Virginia |
| 70 | Anna L Lamb | 8 | daughter | — | Virginia |
| 71 | Thomas E Lamb | 5 | son | — | Virginia |
| 72 | James L Lamb | 3 | son | — | Virginia |
| 73 | Thomas Clark THIS PERSON | 56 | head | Farmer | Maryland |
| 74 | Emma M Clark | 46 | wife | — | Maryland |
| 75 | Thomas E Clark | 29 | son | Saw Dustier | Maryland |
| 76 | W. Earl Clark | 27 | son | Baker | Maryland |
| 77 | George R Clark | 26 | son | Farmer | Maryland |
| 78 | Leslie J Clark | 23 | son | Handy Man | Maryland |
| 79 | Violet V Clark | 22 | daughter | — | Maryland |
| 80 | Lawrence Clark | 20 | son | Farmer | 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)