FT
Francis Thomas — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Frederick-County, Maryland
Our Model Tree links this Francis Thomas across the 1930 and 1940 US Censuses in Frederick-County, Maryland (XGBoost, ~Confirmed) — first a son (b.~1928), then head of a 12-person household.
Age 12
b. ~1928
Male
Son
Born: Maryland
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Frederick-County, Maryland |
| Surname | Thomas |
| Given Name | Francis M. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Frederick City |
| 1935 Residence (County) | Frederick |
| Additional Details | |
| Highest Grade | 4 |
| 1935 Residence | Same house |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Frederick City |
| Est. Birth Year | ~1928 |
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.
12 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Francis | Age | Birth yr |
|---|---|---|---|---|
| Ralph Thomas | Head | — | 45 | ~1895 |
| Doris Thomas | Daughter | — | 8 | ~1932 |
| Mary Thomas | Daughter | — | 4 | ~1936 |
| Ralph Thomas | Son | — | 18 | ~1922 |
| Francis Thomas | Son | — | 12 | ~1928 |
| Lawrence Thomas | Son | — | 16 | ~1924 |
| Veronica Thomas | Daughter | — | 2 | ~1938 |
| Marie Thomas | Spouse | — | 38 | ~1902 |
| Margaret Thomas | Daughter | — | 6 | ~1934 |
| Teresa Thomas | Daughter | — | 14 | ~1926 |
| Anne Thomas | Daughter | — | 20 | ~1920 |
| George Spencer | Other | — | 41 | ~1899 |
Census Appearances
1930
Frederick, Maryland
Son, age 1
Frederick, Maryland · implied b. ~1929 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Francis M |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Frederick-County, Maryland
Son, age 12
Frederick-County, Maryland · implied b. ~1928 — 12 household members
| Surname | Thomas |
| Given Name | Francis M. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Frederick City |
| 1935 Residence (County) | Frederick |
| Highest Grade | 4 |
| 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 Francis Thomas across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Francis Thomas
Son · 1940 · age 12 · b. ~1928 · Maryland
★ You are viewing this record
Sibling
Doris Thomas
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Teresa Thomas
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Thomas
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ralph Thomas
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lawrence Thomas
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anne Thomas
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Veronica Thomas
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Thomas
Sibling · 1940 · age 4
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 — 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-t0627-01548-00174)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Daniel P. Ruby | 55 | Head | Janitor | Maryland |
| 2 | Viola M. Ruby | 47 | Wife | Maid | Pennsylvania |
| 3 | Henry H. Robinson | 50 | Head | Laborer | Virginia |
| 4 | Doris S. Robinson | 53 | Wife | Maid | Virginia |
| 5 | Charles H. Robinson | 26 | Son | Laborer | Virginia |
| 6 | Nancy J. Robinson | 15 | Grand-daughter | Student | Virginia |
| 7 | Matthew Strimmer | 60 | Head | House-Keeper | Maryland |
| 8 | John J. Waters | 26 | Boarder | Laborer | Maryland |
| 9 | Mary Anne Daffney | 24 | Boarder | Maid | Maryland |
| 10 | Alice Waters | 8 | Boarder | — | Maryland |
| 11 | Lilla Johnson | 50 | Head | Maid | Maryland |
| 12 | Thomas Johnson | 50 | Lodger | Laborer | West Virginia |
| 13 | William H. Hammond | 39 | Head | Laborer | Maryland |
| 14 | William D. Hammond | 16 | Son | Laborer | Maryland |
| 15 | Dorothy R. Hammond | 10 | Daughter | — | Maryland |
| 16 | Edith Duffin | 30 | Lodger | Housekeeper | Pennsylvania |
| 17 | Ralph L. Thomas | 45 | Head | Laborer | Maryland |
| 18 | Marie G. Thomas | 38 | Wife | Maid | Maryland |
| 19 | Anne Marie Thomas | 20 | Daughter | Maid | Maryland |
| 20 | Ralph L. Jr. Thomas | 18 | Son | — | Maryland |
| 21 | Lawrence S. Thomas | 16 | Son | — | Maryland |
| 22 | Teresa G. Thomas | 14 | Daughter | — | Maryland |
| 23 | Francis M. Thomas THIS PERSON | 12 | Son | — | Maryland |
| 24 | Doris J. Thomas | 8 | Daughter | — | Maryland |
| 25 | Margaret N. Thomas | 6 | Daughter | — | Maryland |
| 26 | Mary E. Thomas | 4 | Daughter | — | Maryland |
| 27 | Veronica B. Thomas | 2 | Daughter | — | Maryland |
| 28 | George Spencer | 41 | Lodger | Laborer | Maryland |
| 29 | Joseph Simpson | 44 | Head | Laborer | Maryland |
| 30 | Ella May Simpson | 42 | Wife | Maid | Maryland |
| 31 | Hilda Simpson | 19 | Daughter | Maid | Maryland |
| 32 | Austin Simpson | 16 | Son | Student | Maryland |
| 33 | Richard Simpson | 13 | Son | — | Maryland |
| 34 | Virgie Strickland | 47 | Head | Cook | Maryland |
| 35 | Margaret E. Warner | 74 | Head | Laundress | Maryland |
| 36 | Benjamin Snowden | 12 | Nephew | Janitor | Maryland |
| 37 | Clayton E. Biser | 65 | Head | Janitor | Maryland |
| 38 | Effie May Biser | 60 | Wife | House-Helper | Maryland |
| 39 | Mary Smith | 94 | Mother-in-law | — | Virginia |
| 40 | John S. Smith | 21 | Nephew | Launderer | 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)