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Mary Warren — 1940 US Census Record
Model Tree available1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Mary Warren across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Clarence & Clarence — first a daughter (b.~1903), then head of a 5-person household.
Age 37
b. ~1903
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Warren |
| Given Name | Mary A. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 37 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Somerville (city) |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Occupation | Book Binder |
| Industry | Publishers |
| Class of Worker | PW |
| Hours Worked | 24 |
| Income (1939) | 496 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Book Binder |
| Township / Ward | Somerville City |
| Est. Birth Year | ~1903 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Warren | Daughter | — | 37 | ~1903 |
| Sarah Warren | Daughter | — | 35 | ~1905 |
| Frances Warren | Daughter | — | 20 | ~1920 |
| Clarence Warren | Head | — | 61 | ~1879 |
| Sarah Warren | Spouse | — | 61 | ~1879 |
Census Appearances
1920
Middlesex, Massachusetts
Daughter, age 16
Middlesex, Massachusetts · implied b. ~1904 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Warren |
| Given Name | Mary A. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | England |
| Occupation | Feeder press |
| Industry | Book Bindery |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Daughter, age 27
Middlesex, Massachusetts · implied b. ~1903 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Warren |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | England |
| Occupation | Bookbinder |
| Industry | Publishing House |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Daughter, age 37
Middlesex-County, Massachusetts · implied b. ~1903 — 5 household members
| Surname | Warren |
| Given Name | Mary A. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 37 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Somerville (city) |
| 1935 Residence (County) | Middlesex |
| Occupation | Book Binder |
| Industry | Publishers |
| Class of Worker | PW |
| Hours Worked | 24 |
| Income (1939) | 496 |
| Highest Grade | H-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 Mary Warren across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Clarence Warren (~0.92 confidence) and father Clarence Warren (~0.92 confidence) and mother Sarah Warren (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Clarence Warren
b. ~1879
Source father
● Household
· direct · ~0.92
Father
Clarence Warren
b. ~1879
Source father
● Household
· direct · ~0.92
Mother
Sarah Warren
b. ~1879
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Warren
Daughter · 1940 · age 37 · b. ~1903 · Massachusetts
★ You are viewing this record
Sibling
Frances Warren
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Sarah Warren
Sibling · 1940 · age 35
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 — Middlesex-County, Massachusetts
Open full size
1940 US Federal Census — Middlesex-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01705-00239)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Clarence J. Warren | 61 | Head | Case Maker | England |
| 42 | Sarah A. Warren | 61 | Wife | — | England |
| 43 | Mary A. Warren THIS PERSON | 37 | Daughter | Book Binder | Massachusetts |
| 44 | Sarah A. Warren | 35 | Daughter | Sales Clerk | Massachusetts |
| 45 | Frances E. Warren | 20 | Daughter | Office Clerk | Massachusetts |
| 46 | Anna O. Swanfeldt | 49 | Head | Seamstress | Sweden |
| 47 | Margreta Swanfeldt | 19 | Daughter | Filling Clerk | Massachusetts |
| 48 | Lorentz Pearson | 61 | Head | Machinist | Sweden |
| 49 | Eliana O. Pearson | 62 | Wife | — | Sweden |
| 50 | Thomas Torode | 30 | Head | Power Inspector | England |
| 51 | Viola Torode | 23 | Wife | — | Massachusetts |
| 52 | Irene Torode | 5 | Daughter | — | Massachusetts |
| 53 | Judith A. Torode | 3 | Daughter | — | Massachusetts |
| 54 | John G. Brady | 36 | Head | Wool Sorter | Massachusetts |
| 55 | Frances M. Brady | 30 | Wife | — | New Hampshire |
| 56 | John G. Jr. Brady | 7 | Son | — | Massachusetts |
| 57 | Claire E. Brady | 5 | Daughter | — | Massachusetts |
| 58 | Ruth G. Sullivan | 51 | Boarder | Checker | Massachusetts |
| 59 | Michael A. Lannon | 60 | Head | Metal Cutter | Massachusetts |
| 60 | Mary S. Lannon | 53 | Wife | — | South Wales |
| 61 | James T. Lannon | 30 | Son | Salesman | Massachusetts |
| 62 | Mary V. Lannon | 27 | Daughter | Salesgirl | Massachusetts |
| 63 | Florence V. Lannon | 23 | Daughter | Clerk | Massachusetts |
| 64 | Hattie E. Lannon | 17 | Son | — | Massachusetts |
| 65 | Clarence J. Dewolfe | 44 | Head | Painter | Canada English |
| 66 | Mabelle Dewolfe | 45 | Wife | Fitter | Canada English |
| 67 | Willa Shill | 42 | Sister in law | — | Canada English |
| 68 | James Dewolfe | 8 | Son | — | Massachusetts |
| 69 | Harry G. Burnett | 32 | Head | Office Clerk | Massachusetts |
| 70 | Doris Burnett | 64 | Mother | — | New York |
| 71 | Axel Johanson | 65 | Head | Custom Tailor | Sweden |
| 72 | E. Ida Johanson | 66 | Wife | — | Sweden |
| 73 | Carl Bengston | 78 | Head | — | Sweden |
| 74 | Carl H. Bengston | 57 | Son | — | Massachusetts |
| 75 | Walter A. Holmberg | 39 | Head | Police Officer | Massachusetts |
| 76 | Edith E. Holmberg | 31 | Wife | — | Massachusetts |
| 77 | Richard Holmberg | 3 | Son | — | Massachusetts |
| 78 | Albert Holmberg | 72 | Head | Cabinet Maker | Sweden |
| 79 | H. Ida Holmberg | 70 | Wife | — | Sweden |
| 80 | Isaac Shelton | 39 | Son in law | Finisher | Sweden |
Pedigree Summary
Mary + 2 siblings
Gen 1 · 3 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)