GT
Grace Thomas — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Frederick-County, Maryland
Our Model Tree links this Grace Thomas across the 1920, 1930 and 1940 US Censuses in Frederick-County, Maryland (XGBoost, ~Confirmed) — first a spouse (b.~1884), then head of a 3-person household.
Age 56
b. ~1884
Female
Spouse
Born: Maryland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Frederick-County, Maryland |
| Surname | Thomas |
| Given Name | Grace L. |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 56 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Middletown Election District 3 |
| 1935 Residence (County) | Frederick |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | No 7 |
| 1935 Residence | Same house |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Middletown Election District 3 |
| 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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Grace | Age | Birth yr |
|---|---|---|---|---|
| Grace Thomas | Spouse | — | 56 | ~1884 |
| William Thomas | Head | — | 68 | ~1872 |
| Austin Thomas | Son | — | 22 | ~1918 |
Census Appearances
1920
Frederick, Maryland
Spouse, age 36
Frederick, Maryland · implied b. ~1884 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Grace S |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 36 |
| Marital Status | Married |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1930
Frederick, Maryland
Other, age 46
Frederick, Maryland · implied b. ~1884 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Grace L. |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 46 |
| Marital Status | Married |
| Birthplace | Maryland |
| Age at First Marriage | 18 |
| 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 56
Frederick-County, Maryland · implied b. ~1884 — 3 household members
| Surname | Thomas |
| Given Name | Grace L. |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 56 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Middletown Election District 3 |
| 1935 Residence (County) | Frederick |
| Income (1939) | 0 |
| Highest Grade | No 7 |
| 1935 Residence | Same house |
| 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 Grace 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
Grace Thomas
Spouse · 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-t0627-01548-00605)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Blanche Mcallister | 42 | wife | — | Maryland |
| 2 | Allen T. Mcallister | 17 | son | Farmer | Maryland |
| 3 | Leon W. Mcallister | 15 | son | Farmer | Maryland |
| 4 | Carroll E. Mcallister | 12 | son | — | Maryland |
| 5 | Robert D. Mcallister | 10 | son | — | Maryland |
| 6 | Joyce R. Mcallister | 5 | daughter | — | Maryland |
| 7 | Gerald Ahalt | 30 | Head | Day Laborer | Maryland |
| 8 | Mildred Ahalt | 24 | wife | — | Maryland |
| 9 | Ernest E. Ahalt | 36 | Head | Farmer | Maryland |
| 10 | Madaline Ahalt | 32 | wife | — | Maryland |
| 11 | Susanne E. Ahalt | 0 | daughter | — | Maryland |
| 12 | James A. Stine | 19 | brother-in-law | — | Maryland |
| 13 | William Naill | 28 | hired hand | Farmer | Maryland |
| 14 | Betty J. Clemons | 15 | maid | Maid | Maryland |
| 15 | John B. Q. Thomas | 51 | Head | Railroad Agent | Maryland |
| 16 | Mary L. Thomas | 49 | wife | — | Maryland |
| 17 | Katherine L. Thomas | 21 | daughter | — | Maryland |
| 18 | Lida M. Thomas | 17 | daughter | — | Maryland |
| 19 | Mary A. Thomas | 3 | daughter | — | Maryland |
| 20 | John J. Q. Moss | 45 | Head | Farmer | Maryland |
| 21 | Daisy M. Moss | 38 | wife | — | Maryland |
| 22 | Edward F. Moss | 18 | son | Farmer | Maryland |
| 23 | Ruth E. Moss | 16 | daughter | — | Maryland |
| 24 | Elmer L. Moss | 14 | son | — | Maryland |
| 25 | H. Lee Moss | 10 | son | — | Maryland |
| 26 | Helen L. Moss | 5 | daughter | — | Maryland |
| 27 | William E. Thomas | 68 | Head | Road Supervisor | Maryland |
| 28 | Grace L. Thomas THIS PERSON | 56 | wife | — | Maryland |
| 29 | Austin W. Thomas | 22 | son | Farmer | Maryland |
| 30 | Samuel G. Crone | 55 | Head | Farmer | Virginia |
| 31 | Anna S. Crone | 58 | wife | — | Maryland |
| 32 | John C. Crone | 31 | son | Truck Driver | Maryland |
| 33 | Robert B. Crone | 23 | son | Farmer | Maryland |
| 34 | Anna Marie Crone | 20 | daughter | — | Maryland |
| 35 | Samuel E. Crone | 17 | son | Farmer | Maryland |
| 36 | Alonzo G. Ahalt | 62 | Head | Farmer | Maryland |
| 37 | Hattie M. Ahalt | 58 | wife | — | Maryland |
| 38 | Orville D. Ahalt | 26 | son | Farmer | Maryland |
| 39 | Elizabeth E. Ahalt | 26 | daughter-in-law | — | Maryland |
| 40 | Joseph A. C. Boyer | 20 | Head | Farmer | 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)