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Mary Lopez — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Barnstable-County, Massachusetts
Our Model Tree links this Mary Lopez across the 1930 and 1940 US Censuses in Barnstable-County, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1922), then head of a 10-person household.
Age 18
b. ~1922
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Barnstable-County, Massachusetts |
| Surname | Lopez |
| Given Name | Mary H. |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | American Indian |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Mashpee Town |
| 1935 Residence (County) | Barnstable |
| Additional Details | |
| Industry | 0 |
| Highest Grade | No 4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Mashpee Town |
| Est. Birth Year | ~1922 |
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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Helen Lopez | Daughter | — | 20 | ~1920 |
| Vernon Lopez | Son | — | 17 | ~1923 |
| Emeline Lopez | Head | — | 48 | ~1892 |
| Frank Lopez | Son | — | 26 | ~1914 |
| Crawford Lopez | Son | — | 14 | ~1926 |
| Mary Lopez | Daughter | — | 18 | ~1922 |
| Arline Lopez | Daughter | — | 22 | ~1918 |
| Alden Lopez | Son | — | 24 | ~1916 |
| William Lopez | Son | — | 11 | ~1929 |
| Wilfred Lopez | Son | — | 16 | ~1924 |
Census Appearances
1930
Barnstable, Massachusetts
Daughter, age 9
Barnstable, Massachusetts · implied b. ~1921 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Lopes |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Cape Verde |
| Mother's Birthplace | Cape Verde |
| Industry | School |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Barnstable-County, Massachusetts
Daughter, age 18
Barnstable-County, Massachusetts · implied b. ~1922 — 10 household members
| Surname | Lopez |
| Given Name | Mary H. |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | American Indian |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Mashpee Town |
| 1935 Residence (County) | Barnstable |
| Industry | 0 |
| Highest Grade | No 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 Lopez across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Lopez
Daughter · 1940 · age 18 · b. ~1922 · Massachusetts
★ You are viewing this record
Sibling
Alden Lopez
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frank Lopez
Sibling · 1940 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Wilfred Lopez
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Lopez
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Vernon Lopez
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Lopez
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Crawford Lopez
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Arline Lopez
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 — Barnstable-County, Massachusetts
Open full size
1940 US Federal Census — Barnstable-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01566-00085)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | A. Muriel Peters | 13 | daughter | — | Massachusetts |
| 2 | Russell M. Peters | 11 | son | — | Massachusetts |
| 3 | John A. Peters | 10 | son | — | Massachusetts |
| 4 | Randolph G. Peters | 8 | son | — | Massachusetts |
| 5 | Ann R. Peters | 7 | daughter | — | Massachusetts |
| 6 | Stanley M. Cotton | 32 | Head | Teacher | Maine |
| 7 | Marguerite L. Cotton | 28 | wife | — | New York |
| 8 | Alice M. Matheson | 57 | Head | Proprietor | Massachusetts |
| 9 | Avery L. Young | 66 | Brother | Old Age | Massachusetts |
| 10 | Antonio Ferreira | 50 | lodger | 25 | Cape Verde Islands |
| 11 | Frank E. Hicks | 23 | Head | Painter | Massachusetts |
| 12 | Olive E. Hicks | 19 | wife | — | Massachusetts |
| 13 | Mary A. Corvett | 69 | Head | — | Massachusetts |
| 14 | J. Sheldon Corvett | 42 | son | Laborer | Massachusetts |
| 15 | Charles N. Collins | 73 | Head | Owner | Massachusetts |
| 16 | Irene W. Collins | 68 | wife | — | Massachusetts |
| 17 | — | None | — | Owner | — |
| 18 | — | None | — | Waitress | — |
| 19 | — | None | — | Waitress | — |
| 20 | Edward L. Besse | 75 | Head | Prop. | Massachusetts |
| 21 | Agnes M. Besse | 35 | wife | — | Illinois |
| 22 | Herman C. Lopes | 31 | Head | Laborer | Massachusetts |
| 23 | Mary L. Lopes | 25 | wife | — | Massachusetts |
| 24 | Augustus Booker | 40 | Head | Fisherman | Massachusetts |
| 25 | John T. Booker | 22 | Brother | Fisherman | Massachusetts |
| 26 | Mabel E. Buach|Beach | 27 | Head | Waitress | New York |
| 27 | Marion Buach|Beach | 12 | daughter | — | New York |
| 28 | Clinton Haynes | 46 | lodger | Driver | Massachusetts |
| 29 | John Green | 53 | Head | Mason | Massachusetts |
| 30 | Flossie H. Green | 50 | wife | — | Massachusetts |
| 31 | Emeline E. Lopez | 48 | Head | — | Massachusetts |
| 32 | Frank H. Lopez | 26 | son | Laborer | Massachusetts |
| 33 | Alden D. Lopez | 24 | son | — | Massachusetts |
| 34 | Arline A. Lopez | 22 | daughter | — | Massachusetts |
| 35 | Helen Lopez | 20 | daughter | — | Massachusetts |
| 36 | Mary H. Lopez THIS PERSON | 18 | daughter | — | Massachusetts |
| 37 | Vernon Lopez | 17 | son | — | Massachusetts |
| 38 | Wilfred Lopez | 16 | son | — | Massachusetts |
| 39 | Crawford Lopez | 14 | son | — | Massachusetts |
| 40 | William Lopez | 11 | son | — | 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)