Mary Costa — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Bristol-County, Massachusetts

Our Model Tree links this Mary Costa across the 1920, 1930 and 1940 US Censuses in Bristol-County, Massachusetts (XGBoost, ~Confirmed) — first a spouse (b.~1886), then head of a 4-person household.

Age 54 b. ~1886 Female Spouse Born: Azores Married

1940 Census Record Details

Census Year	1940
Location	Bristol-County, Massachusetts
Surname	Costa
Given Name	Mary
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	54
Marital Status	Married
Birthplace	Azores
1935 Residence (City)	New Bedford City
1935 Residence (County)	Bristol
Naturalization Status	Alien
Additional Details
Occupation	Sales Clerk
Industry	Wholesale Fruit Store
Class of Worker	NP
Hours Worked	24
Highest Grade	No 0
1935 Residence	Same House
Birth Country	Portugal
Birthplace (normalized)	azores
Occupation	Sales Clerk
Township / Ward	New Bedford City
Est. Birth Year	~1886

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.

4 people recorded at the same address in the 1940 census.

Name	Relation to head	Relative to Mary	Age	Birth yr
Leonard Costa	Son	—	15	~1925
Mary Costa	Spouse	—	54	~1886
Bernadines Costa	Other	—	92	~1848
John Costa	Head	—	55	~1885

Census Appearances

1920

Bristol, Massachusetts

Spouse, age 39

Bristol, Massachusetts · implied b. ~1881 — 10 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Costa
Given Name	Mary
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	39
Marital Status	Married
Birthplace	Azores
Year of Immigration	1917
Naturalization Status	Alien
Father's Birthplace	Azores
Mother's Birthplace	Azores
Occupation	none
Can Read	No
Can Write	No
Speaks English	No
Mother Tongue	Portuguese
Birth Country	Portugal
Birthplace (normalized)	azores

1930

Bristol, Massachusetts

Spouse, age 47

Bristol, Massachusetts · implied b. ~1883 — 3 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Costa
Given Name	Mary C.
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	47
Marital Status	Married
Birthplace	Azores
Naturalization Status	Alien
Year of Immigration	1916
Age at First Marriage	26
Father's Birthplace	Azores
Mother's Birthplace	Azores
Can Read/Write	No
Mother Tongue	Portuguese
Birth Country	Portugal
Birthplace (normalized)	azores

1940

Bristol-County, Massachusetts

Spouse, age 54

Bristol-County, Massachusetts · implied b. ~1886 — 4 household members

Surname	Costa
Given Name	Mary
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	54
Marital Status	Married
Birthplace	Azores
1935 Residence (City)	New Bedford City
1935 Residence (County)	Bristol
Naturalization Status	Alien
Occupation	Sales Clerk
Industry	Wholesale Fruit Store
Class of Worker	NP
Hours Worked	24
Highest Grade	No 0
1935 Residence	Same House
Birth Country	Portugal
Birthplace (normalized)	azores

Model Tree

Linked across censuses

Our Model Tree links Mary Costa across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.

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This person

Anchor record

Mary Costa

Spouse · 1940 · age 54 · b. ~1886 · 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 — Bristol-County, Massachusetts Open full size

Page Contents

28 people indexed on this census page (nara:1940:m-t0627-01701-00408)

Line	Name	Age	Relation	Occupation	Birthplace
41	George Desroches	50	Lodger	Yard Man	Mass.
42	Grover Devlin	55	Lodger	Laborer	Mass.
43	Mary Martin	42	Head	Weaver	Azores
44	Eleanor Martin	30	Daughter	Sales Clerk	Mass.
45	Robert Martin	11	Son	—	Mass.
46	Wilfrid Martin	10	Son	—	Mass.
47	Joseph Cardoza	43	Head	Laborer	Mass.
48	Bertha Cardoza	38	Wife	—	Mass.
49	Marian Cardoza	17	Daughter	—	Mass.
50	Helena Cardoza	14	Daughter	—	Mass.
51	Edith Cardoza	13	Daughter	—	Mass.
52	Adelarde Medeiros	59	Head	—	Azores
53	Mabel Medeiros	38	Daughter	Spooler Tender	Mass.
54	Lydia Medeiros	37	Daughter	Quill Winder	Mass.
55	Adelarde Medeiros	33	Daughter	Roller Cleaner	Mass.
56	Helen Medeiros	32	Daughter	Roller Cleaner	Mass.
57	Frank Medeiros	30	Son	Yarn Boy	Mass.
58	Leonard Medeiros	26	Son	Mechanic	Mass.
59	Dorothy Medeiros	23	Daughter	New Worker	Mass.
60	John Costa	55	Head	Sales Clerk	Azores
61	Mary Costa THIS PERSON	54	Wife	Sales Clerk	Azores
62	Bernadines Costa	92	Mother-in-law	—	Azores
63	Leonard Costa	15	Son	—	Mass.
64	John Souza	44	Head	Spinner	Rio de Janeiro
65	Angelina Souza	46	Wife	—	Azores
66	Barbara Souza	10	Daughter	—	Mass.
67	Manuel Martin	51	Head	Slasher Tender	Azores
68	Tenney Martin	26	Son	New Worker	Mass.

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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)

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