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Bertha Thomas — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Frederick-County, Maryland
Our Model Tree links this Bertha Thomas across the 1920, 1930 and 1940 US Censuses in Frederick-County, Maryland (XGBoost, ~Confirmed) — first a spouse (b.~1898), then head of a 6-person household.
Age 42
b. ~1898
Female
Spouse
Born: Maryland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Frederick-County, Maryland |
| Surname | Thomas |
| Given Name | Bertha M. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 42 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Election District 23 Ballenger |
| 1935 Residence (County) | Frederick |
| Additional Details | |
| Occupation | Housewife |
| Industry | Farm |
| Class of Worker | NP |
| Income (1939) | 0 |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Occupation | Housewife |
| Township / Ward | Election District 23 Ballenger |
| Est. Birth Year | ~1898 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Bertha | Age | Birth yr |
|---|---|---|---|---|
| Russell Thomas | Head | — | 55 | ~1885 |
| James Thomas | Son | — | 22 | ~1918 |
| Fannie Thomas | Other | — | 18 | ~1922 |
| John Thomas | Son | — | 23 | ~1917 |
| Bertha Thomas | Spouse | — | 42 | ~1898 |
| James Thomas | Other | — | 10 | ~1930 |
Census Appearances
1920
Frederick, Maryland
Spouse, age 22
Frederick, Maryland · implied b. ~1898 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Bertha |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | Black |
| Age | 22 |
| Marital Status | Married |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1930
Frederick, Maryland
Other, age 32
Frederick, Maryland · implied b. ~1898 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Bertha M |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 32 |
| Marital Status | Married |
| Birthplace | Maryland |
| Age at First Marriage | 24 |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Can Read/Write | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Frederick-County, Maryland
Spouse, age 42
Frederick-County, Maryland · implied b. ~1898 — 6 household members
| Surname | Thomas |
| Given Name | Bertha M. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 42 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Election District 23 Ballenger |
| 1935 Residence (County) | Frederick |
| Occupation | Housewife |
| Industry | Farm |
| Class of Worker | NP |
| Income (1939) | 0 |
| Highest Grade | No 7 |
| 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 Bertha Thomas across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Bertha Thomas
Spouse · 1940 · age 42 · b. ~1898 · 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-t0627-01549-00617)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Gordon S. Smith | 48 | Head | Laborer | Maryland |
| 2 | Jemima E. Smith | 42 | Wife | Housewife | Maryland |
| 3 | Leroy Smith | 18 | Son | Laborer | Maryland |
| 4 | Richard A. Smith | 17 | Son | Laborer | Maryland |
| 5 | Helen V. Smith | 15 | Daughter | Housewife | Maryland |
| 6 | Christine M. Smith | 13 | Daughter | — | Maryland |
| 7 | Albert L. Grimmett | 2 | Hired hand | — | Maryland |
| 8 | Floyd S. Smith | 20 | Son | Laborer | Maryland |
| 9 | Lewis Pitt | 72 | Head | Laborer | Maryland |
| 10 | Ella L. Pitt | 70 | Wife | Housewife | Maryland |
| 11 | Harvey G. Baker | 60 | Head | Dealer And Farm Machinery | Maryland |
| 12 | Annie E. Baker | 60 | Wife | Housewife | Maryland |
| 13 | H. George Baker | 23 | Son | Salesman | Maryland |
| 14 | Charles M. Baker | 8 | Hired hand | — | Maryland |
| 15 | William O. Michael | 73 | Head | Operator | Maryland |
| 16 | Nellie I. Michael | 47 | Wife | Housewife | Maryland |
| 17 | Charles C. Hann | 53 | Hired hand | Laborer | Maryland |
| 18 | Russell C. Thomas | 55 | Head | Operator | Maryland |
| 19 | Bertha M. Thomas THIS PERSON | 42 | Wife | Housewife | Maryland |
| 20 | James R. Thomas | 22 | Son | — | Maryland |
| 21 | James R. Thomas | 10 | Hired hand | — | Maryland |
| 22 | John William Thomas | 23 | Son | Laborer | Maryland |
| 23 | Fannie Virginia Thomas | 18 | Daughter in law | Housewife | Maryland |
| 24 | Bernard E. Burkhart | 35 | Head | Laborer | Maryland |
| 25 | Nannie E. Burkhart | 33 | Wife | Housewife | Maryland |
| 26 | Bernard E. Jr. Burkhart | 14 | Son | Scholar | Maryland |
| 27 | Marion E. Burkhart | 10 | Son | — | Maryland |
| 28 | Catherine A. Burkhart | 6 | Daughter | — | Maryland |
| 29 | Nellie E. Burkhart | 4 | Daughter | — | Maryland |
| 30 | William B. Mckenzie | 65 | Head | Operator | Maryland |
| 31 | Alice E. Mckenzie | 64 | Wife | Housewife | Maryland |
| 32 | Grace N. Mckenzie | 19 | Daughter | Helper | Maryland |
| 33 | Robert C. Lulu | 35 | Son in law | Polisher | Maryland |
| 34 | Ruth M. Lulu | 30 | Daughter | Folder | Maryland |
| 35 | Robert William Lulu | 9 | Grandson | — | Maryland |
| 36 | Albert L. Lulu | 8 | Grandson | — | Maryland |
| 37 | Spencer G. Jones | 53 | Head | Operator | Maryland |
| 38 | Emma L. Jones | 53 | Wife | Housewife | Maryland |
| 39 | Alvin G. Fry | 32 | Son in law | Laborer | Maryland |
| 40 | Isabel M. Fry | 30 | Daughter | Helper Housewife | Maryland |
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)