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Mary Lopez — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Mary Lopez across the 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a spouse (b.~1890), then head of a 9-person household.
Age 50
b. ~1890
Female
Spouse
Born: Portugal
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Lopez |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 50 |
| Marital Status | Married |
| Birthplace | Portugal |
| 1935 Residence (City) | Somerville city |
| 1935 Residence (County) | Middlesex |
| Naturalization Status | Alien |
| Additional Details | |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth Country | Portugal |
| Birthplace (normalized) | portugal |
| Township / Ward | Somerville City |
| Est. Birth Year | ~1890 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Elsie Sousa | Other | — | 1 | ~1939 |
| Mary Lopez | Daughter | — | 18 | ~1922 |
| James Lopez | Son | — | 24 | ~1916 |
| John Lopez | Son | — | 14 | ~1926 |
| Joseph Lopez | Head | — | 50 | ~1890 |
| Mary Lopez | Spouse | — | 50 | ~1890 |
| Anthea Sousa | Other | — | 3 | ~1937 |
| Mary Sousa | Daughter | — | 5 | ~1935 |
| Elsie Sousa | Daughter | — | 20 | ~1920 |
Census Appearances
1930
Middlesex, Massachusetts
Spouse, age 40
Middlesex, Massachusetts · implied b. ~1890 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Lopes |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Portugal |
| Naturalization Status | Alien |
| Year of Immigration | 1921 |
| Age at First Marriage | 20 |
| Father's Birthplace | Portugal |
| Mother's Birthplace | Portugal |
| Occupation | none |
| Can Read/Write | No |
| Mother Tongue | Portuguese |
| Birth Country | Portugal |
| Birthplace (normalized) | portugal |
1940
Middlesex-County, Massachusetts
Spouse, age 50
Middlesex-County, Massachusetts · implied b. ~1890 — 9 household members
| Surname | Lopez |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 50 |
| Marital Status | Married |
| Birthplace | Portugal |
| 1935 Residence (City) | Somerville city |
| 1935 Residence (County) | Middlesex |
| Naturalization Status | Alien |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth Country | Portugal |
| Birthplace (normalized) | portugal |
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 Lopez across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Lopez
Spouse · 1940 · age 50 · b. ~1890 · Massachusetts
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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-t0627-01702-00577)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Thomas J. Norton | 51 | Head | Cement Finisher | Massachusetts |
| 2 | William J. Norton | 27 | Son | — | Massachusetts |
| 3 | James L. Norton | 21 | Son | Laborer | Massachusetts |
| 4 | Robert F. Norton | 19 | Son | Laborer | Massachusetts |
| 5 | Joseph Lopez | 50 | Head | Furniture Finisher | Portugal |
| 6 | Mary Lopez THIS PERSON | 50 | Wife | — | Portugal |
| 7 | James J. Lopez | 24 | Son | Furniture Finisher | Portugal |
| 8 | Mary Lopez | 18 | Daughter | Shield Maker | Portugal |
| 9 | John Lopez | 14 | Son | — | Massachusetts |
| 10 | Elsie Sousa | 20 | Daughter | — | Portugal |
| 11 | Mary Sousa | 5 | Daughter | — | Massachusetts |
| 12 | Anthea Sousa | 3 | Granddaughter | — | Massachusetts |
| 13 | Elsie Sousa | 1 | Granddaughter | — | Massachusetts |
| 14 | Mariana Amaral | 41 | Head | Floor Walker | Portugal |
| 15 | Hilda Q. Amaral | 18 | Daughter | — | Portugal |
| 16 | Walter Souza | 27 | Head | Watchman | Rhode Island |
| 17 | Ruby J. Souza | 25 | Wife | — | Massachusetts |
| 18 | Edith M. Souza | 2 | Daughter | — | Massachusetts |
| 19 | Walter J. Souza | 1 | Son | — | Massachusetts |
| 20 | Lawrence M. Souza | 0 | Son | — | Massachusetts |
| 21 | Anna Lislevich | 28 | Head | Sausage Finisher | Massachusetts |
| 22 | Elizabeth Lislevich | 33 | Sister | Packer | Massachusetts |
| 23 | Stella Lislevich | 23 | Sister | Waitress | Massachusetts |
| 24 | Agnes Lislevich | 18 | Sister | — | Massachusetts |
| 25 | Manuel Souza | 52 | Head | — | Portugal |
| 26 | Mary Souza | 48 | Wife | — | Portugal |
| 27 | Manuel Souza | 23 | Son | Laborer | Massachusetts |
| 28 | John Souza | 21 | Son | — | Massachusetts |
| 29 | Raymond Souza | 19 | Son | Laborer | Massachusetts |
| 30 | Celia Souza | 17 | Daughter | — | Massachusetts |
| 31 | Albert Souza | 15 | Son | — | Massachusetts |
| 32 | Alfred Souza | 11 | Son | — | Massachusetts |
| 33 | Mildred Souza | 9 | Daughter | — | Massachusetts |
| 34 | Daniel Souza | 6 | Son | — | Massachusetts |
| 35 | Robert Souza | 4 | Son | — | Massachusetts |
| 36 | William Houlihan | 65 | Head | — | Eire |
| 37 | Bridget Houlihan | 64 | Wife | — | Eire |
| 38 | John Houlihan | 32 | Son | Clerk | Massachusetts |
| 39 | Patrick H. Geary | 64 | Head | Foreman | Eire |
| 40 | Bessie Geary | 54 | Wife | — | Eire |
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)