MP
Mary Power — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Mary Power across the 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1919), then head of a 7-person household.
Age 21
b. ~1919
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Power |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Somerville City |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Occupation | Salesgirl |
| Industry | Department Store |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 298 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Salesgirl |
| Township / Ward | Somerville City |
| Est. Birth Year | ~1919 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Alexander Power | Son | — | 17 | ~1923 |
| Lillian Power | Daughter | — | 20 | ~1920 |
| Ethel Power | Spouse | — | 41 | ~1899 |
| Janet Power | Daughter | — | 19 | ~1921 |
| Viola Power | Daughter | — | 13 | ~1927 |
| Alexander Power | Head | — | 54 | ~1886 |
| Mary Power | Daughter | — | 21 | ~1919 |
Census Appearances
1930
Middlesex, Massachusetts
Daughter, age 11
Middlesex, Massachusetts · implied b. ~1919 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Powers |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Daughter, age 21
Middlesex-County, Massachusetts · implied b. ~1919 — 7 household members
| Surname | Power |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Somerville City |
| 1935 Residence (County) | Middlesex |
| Occupation | Salesgirl |
| Industry | Department Store |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 298 |
| 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 Power across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Power
Daughter · 1940 · age 21 · b. ~1919 · Massachusetts
★ You are viewing this record
Sibling
Lillian Power
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Alexander Power
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Janet Power
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Viola Power
Sibling · 1940 · age 13
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
39 people indexed on this census page (nara:1940:m-t0627-01703-00673)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Anthony De Riva | 54 | Head | Owner | Italy |
| 2 | Julia De Riva | 33 | Wife | — | Massachusetts |
| 3 | Marie De Riva | 30 | Daughter | Assistant | Maine |
| 4 | Mary De Riva | 27 | Daughter | Stenographer | Massachusetts |
| 5 | Evelyn De Riva | 15 | Daughter | — | Massachusetts |
| 6 | Thomas Kanter | 44 | Head | Salesman | Albania |
| 7 | Anna Kanter | 44 | Wife | Stitcher | Albania |
| 8 | Victoria Kanter | 23 | Daughter | Stitcher | Albania |
| 9 | Rosa B. Ward | 75 | Head | — | New York |
| 10 | Myrtle E. Ward | 40 | Daughter | Inspector | New York |
| 11 | John B. Ward | 22 | Grandchild | Laborer | Massachusetts |
| 12 | Shirley Ward | 13 | Grandchild | — | Massachusetts |
| 13 | Frank Festa | 63 | Head | Cobbler | Italy |
| 14 | Fortunata Festa | 57 | Wife | — | Italy |
| 15 | Daniel A. Festa | 36 | Son | Cobbler | Italy |
| 16 | Frank Festa | 25 | Son | New Worker | Massachusetts |
| 17 | Cosmo Di Sola | 52 | Head | Butcher | Italy |
| 18 | Rosalie Di Sola | 47 | Wife | — | Italy |
| 19 | Matilda Di Sola | 29 | Daughter | Stitcher | Massachusetts |
| 20 | Mary Di Sola | 26 | Daughter | New Worker | Massachusetts |
| 21 | Elaine Di Sola | 21 | Daughter | Stitcher | Massachusetts |
| 22 | Michael Di Sola | 19 | Son | Laborer | Massachusetts |
| 23 | Aldo Di Sola | 18 | Daughter | — | Massachusetts |
| 24 | Nicholas Di Sola | 15 | Son | — | Massachusetts |
| 25 | Arthur Di Sola | 11 | Son | — | Massachusetts |
| 26 | Lorraine Di Sola | 6 | Daughter | — | Massachusetts |
| 27 | John Martinelli | 38 | Head | Chef | Massachusetts |
| 28 | Mary Martinelli | 37 | Wife | — | Massachusetts |
| 29 | Mary Martinelli | 12 | Daughter | — | Massachusetts |
| 30 | Marjorie Martinelli | 10 | Daughter | — | Massachusetts |
| 31 | John Martinelli | 5 | Son | — | Massachusetts |
| 32 | Barbara Martinelli | 4 | Daughter | — | Massachusetts |
| 33 | Alexander Power | 54 | Head | Carpenter | Newfoundland |
| 34 | Ethel R. Power | 41 | Wife | — | Newfoundland |
| 35 | Mary Power THIS PERSON | 21 | Daughter | Salesgirl | Massachusetts |
| 36 | Lillian Power | 20 | Daughter | New Worker | Massachusetts |
| 37 | Janet Power | 19 | Daughter | New Worker | Massachusetts |
| 38 | Alexander Power | 17 | Son | — | Massachusetts |
| 39 | Viola Power | 13 | Daughter | — | Massachusetts |
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)