FT
Frances Thomas — 1940 US Census Record
Model Tree available1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this Frances Thomas across the 1920, 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed), with identified parents James & Isoline — first a daughter (b.~1912), then head of a 9-person household.
Age 28
b. ~1912
Female
Daughter
Born: Massachusetts
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Thomas |
| Given Name | Frances |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 28 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston city |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Boston City |
| Est. Birth Year | ~1912 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Frances | Age | Birth yr |
|---|---|---|---|---|
| Robert Thomas | Other | — | 3 | ~1937 |
| Mabel Crosby | Head | — | 49 | ~1891 |
| Gertrude Crosby | Daughter | — | 25 | ~1915 |
| Frances Thomas | Daughter | — | 28 | ~1912 |
| Mary Crosby | Daughter | — | 22 | ~1918 |
| Richard Thomas | Other | — | 2 | ~1938 |
| Shirley Low | Other | — | 2 | ~1938 |
| Edith Thomas | Other | — | 10 | ~1930 |
| Edward Crosby | Other | — | 4 | ~1936 |
Census Appearances
1920
Suffolk, Massachusetts
Daughter, age 9
Suffolk, Massachusetts · implied b. ~1911 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Florence |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Barbados |
| Mother's Birthplace | Jamaica |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
Daughter, age 18
Suffolk, Massachusetts · implied b. ~1912 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Florence |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | Black |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Barbados B. W. I. |
| Mother's Birthplace | Jamaica B. W. I. |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Daughter, age 28
Suffolk-County, Massachusetts · implied b. ~1912 — 9 household members
| Surname | Thomas |
| Given Name | Frances |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 28 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston city |
| 1935 Residence (County) | Suffolk |
| Class of Worker | 0 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
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 Frances Thomas across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father James Thomas (~0.92 confidence) and mother Isoline Thomas (~0.92 confidence) and mother Isolene Thomas (~0.92 confidence) and mother Mabel Crosby (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
James Thomas
b. ~1887
Source father
● Household
· direct · ~0.92
Mother
Isoline Thomas
b. ~1888
Source mother
● Household
· direct · ~0.92
Mother
Isolene Thomas
b. ~1891
Source mother
● Household
· direct · ~0.92
Mother
Mabel Crosby
b. ~1891
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Frances Thomas
Daughter · 1940 · age 28 · b. ~1912 · Massachusetts
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Sibling
Gertrude Crosby
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Crosby
Sibling · 1940 · age 22
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 — Suffolk-County, Massachusetts
Open full size
1940 US Federal Census — Suffolk-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01666-00179)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Prastepous Anthony Pantopano | 10 | — | — | Massachusetts |
| 42 | John Begorian | 48 | Head | Owner | Armenia |
| 43 | Martha Begorian | 45 | Wife | — | Armenia |
| 44 | John Begorian | 19 | Son | Counterman | Massachusetts |
| 45 | Florence Begorian | 16 | Daughter | — | Massachusetts |
| 46 | Mary Begorian | 13 | Daughter | — | Massachusetts |
| 47 | James Salados | 45 | Head | Shoe Store | Greece |
| 48 | Catherine Salados | 40 | Wife | — | Greece |
| 49 | George Salados | 15 | Son | — | Massachusetts |
| 50 | Theodore Salados | 14 | Daughter | — | Massachusetts |
| 51 | Sophie Salados | 13 | Daughter | — | Massachusetts |
| 52 | Joseph Santors | 46 | Head | Owner | Italy |
| 53 | Mary Santors | 44 | Wife | — | Italy |
| 54 | Sally Santors | 20 | Daughter | Stitcher | Massachusetts |
| 55 | Theresa Santors | 16 | Daughter | — | Massachusetts |
| 56 | Anna Santors | 13 | Daughter | — | Massachusetts |
| 57 | Frank Bulla | 32 | Head | Entertainer | Massachusetts |
| 58 | Virginia Bulla | 32 | Wife | — | Massachusetts |
| 59 | Virginia Bulla | 11 | Daughter | — | Massachusetts |
| 60 | Frank Bulla | 9 | Son | — | Massachusetts |
| 61 | John Bulla | 8 | Son | — | Massachusetts |
| 62 | Catherine Shea | 49 | Lodger | — | Massachusetts |
| 63 | Mabel Crosby | 49 | Head | — | Massachusetts |
| 64 | Gertrude Crosby | 25 | Daughter | Laundress | Massachusetts |
| 65 | Mary Crosby | 22 | Daughter | Laundress | Massachusetts |
| 66 | Frances Thomas THIS PERSON | 28 | Daughter | — | Massachusetts |
| 67 | Edith Thomas | 10 | Granddaughter | — | Massachusetts |
| 68 | Robert Thomas | 3 | Grandson | — | Massachusetts |
| 69 | Richard Thomas | 2 | Grandson | — | Massachusetts |
| 70 | Edward Crosby | 4 | Grandson | — | Massachusetts |
| 71 | Shirley Low | 2 | Granddaughter | — | Massachusetts |
| 72 | George Courtney | 42 | Head | Painter | Massachusetts |
| 73 | Louise Courtney | 46 | Wife | — | Connecticut |
| 74 | William Schlichte | 35 | Lodger | Plumber | Massachusetts |
| 75 | Michael Leeds | 43 | Lodger | Painter | Greece |
| 76 | Gustaf Blackstad | 57 | Head | — | Norway |
| 77 | Gertrude Blackstad | 26 | Daughter | Laundress | Norway |
| 78 | Rachel Ramos | 24 | Daughter | Laundress | Norway |
| 79 | Ruth Waldman | 13 | Granddaughter | — | Massachusetts |
| 80 | Greta Ramos | 10 | Granddaughter | — | Massachusetts |
Related Census Records
Pedigree Summary
Frances + 2 siblings
Gen 1 · 4 parents
~0.92
Max depth 4 (1900–1950 window)
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)