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Mary Warren — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Mary Warren across the 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1921), then head of a 11-person household.
Age 19
b. ~1921
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Warren |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Somerville City |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Occupation | general clerk |
| Industry | Department store |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 375 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | General Clerk |
| Township / Ward | Somerville City |
| Est. Birth Year | ~1921 |
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.
11 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Florence Warren | Daughter | — | 23 | ~1917 |
| Mary Warren | Daughter | — | 19 | ~1921 |
| Mervin Warren | Daughter | — | 15 | ~1925 |
| Betty Warren | Daughter | — | 32 | ~1908 |
| Grace Warren | Daughter | — | 21 | ~1919 |
| Irene Warren | Daughter | — | 27 | ~1913 |
| Edna Warren | Daughter | — | 17 | ~1923 |
| William Warren | Head | — | 57 | ~1883 |
| William Warren | Son | — | 25 | ~1915 |
| Sadie Warren | Spouse | — | 37 | ~1903 |
| Mary Warren | Spouse | — | 59 | ~1881 |
Census Appearances
1930
Middlesex, Massachusetts
Other, age 10
Middlesex, Massachusetts · implied b. ~1920 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Warren |
| Given Name | Mary |
| Relationship to Head | Step Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Daughter, age 19
Middlesex-County, Massachusetts · implied b. ~1921 — 11 household members
| Surname | Warren |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Somerville City |
| 1935 Residence (County) | Middlesex |
| Occupation | general clerk |
| Industry | Department store |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 375 |
| 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 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Warren
Daughter · 1940 · age 19 · b. ~1921 · Massachusetts
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Sibling
Mervin Warren
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Warren
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edna Warren
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Florence Warren
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Betty Warren
Sibling · 1940 · age 32
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Irene Warren
Sibling · 1940 · age 27
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Grace Warren
Sibling · 1940 · age 21
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-t0627-01704-00239)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Samuel King | 43 | Head | Manager | Pennsylvania |
| 42 | Helen E. King | 32 | Wife | — | Massachusetts |
| 43 | Mary King | 8 | Daughter | — | Massachusetts |
| 44 | Norma King | 6 | Daughter | — | Massachusetts |
| 45 | Janet King | 2 | Daughter | — | Massachusetts |
| 46 | Samuel King | 1 | Son | — | Massachusetts |
| 47 | Martin Mcgrath | 57 | Head | Steam Engineer | Newfoundland |
| 48 | Jessie Mcgrath | 56 | Wife | — | Massachusetts |
| 49 | Julia A. Twohill | 59 | Head | Examiner | Massachusetts |
| 50 | Mary E. Twohill | 57 | Sister | Salesgirl | Massachusetts |
| 51 | Frances Twohill | 52 | Sister | Salesgirl | Massachusetts |
| 52 | Leda Twohill | 49 | Sister | Salesgirl | Massachusetts |
| 53 | Alice Twohill | 46 | Sister | Salesgirl | Massachusetts |
| 54 | Alfred Dowling | 44 | Head | Clerk | Massachusetts |
| 55 | Bert Gilman | 54 | Head | Locomotive Engineer | Massachusetts |
| 56 | Laura Gilman | 52 | Wife | — | Massachusetts |
| 57 | Alberta Gilman | 15 | Daughter | — | Massachusetts |
| 58 | Avis Gilman | 13 | Daughter | — | Massachusetts |
| 59 | Robert Randell | 64 | Head | Construction Laborer | Newfoundland |
| 60 | Lily Randell | 58 | Wife | — | Newfoundland |
| 61 | Victor Randell | 30 | Son | Construction Laborer | Newfoundland |
| 62 | Ralph Randell | 25 | Son | Roofer | Newfoundland |
| 63 | Jean Randell | 15 | Daughter | — | Newfoundland |
| 64 | John Loder | 25 | Nephew | Roofer | Newfoundland |
| 65 | Julia Corridan | 70 | Head | — | Eire (Ireland) |
| 66 | William Warren | 57 | Head | — | Newfoundland |
| 67 | Mary Warren | 59 | Wife | — | Newfoundland |
| 68 | Betty Warren | 32 | Daughter | Telephone Operator | Massachusetts |
| 69 | Grace Warren | 21 | Daughter | — | Massachusetts |
| 70 | Irene Warren | 27 | Daughter | Telephone Operator | Massachusetts |
| 71 | William Warren | 25 | Son | Blueprint | Massachusetts |
| 72 | Florence Warren | 23 | Daughter | General Clerk | Massachusetts |
| 73 | Mary Warren THIS PERSON | 19 | Daughter | General Clerk | Massachusetts |
| 74 | Edna Warren | 17 | Daughter | — | Massachusetts |
| 75 | Sadie Warren | 37 | Wife | Salesgirl | Massachusetts |
| 76 | Mervin Warren | 15 | Daughter | — | Massachusetts |
| 77 | Catherine Mccaffrey | 53 | Head | — | Ireland |
| 78 | Mary B. Mccaffrey | 25 | Daughter | Telephone Operator | Massachusetts |
| 79 | Catherine Mccaffrey | 23 | Daughter | Binder | Massachusetts |
| 80 | Suzanne Mccaffrey | 21 | Daughter | Cookie Packer | Massachusetts |
Related Census Records
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)