Mary Costello — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Bronx-County, New York

Our Model Tree links this Mary Costello across the 1920, 1930 and 1940 US Censuses in Bronx-County, New York (XGBoost, ~Confirmed) — first a head (b.~1874), then head of a 3-person household.

Age 66 b. ~1874 Female Head Born: Ireland Widowed

1940 Census Record Details

Census Year	1940
Location	Bronx-County, New York
Surname	Costello
Given Name	Mary J.
Relationship to Head	Head
Sex	F
Color / Race	White
Age	66
Marital Status	Widowed
Birthplace	Ireland
1935 Residence (City)	New York
Naturalization Status	Naturalized
Additional Details
Income (1939)	0
Highest Grade	H-4
1935 Residence	New York
Birth Country	Ireland
Birthplace (normalized)	ireland
Township / Ward	Ny City
Est. Birth Year	~1874

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.

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

Name	Relation to head	Relative to Mary	Age	Birth yr
Mary Costello	Head	—	66	~1874
Bartholomew O'Rourke	Other	—	36	~1904
John Costello	Son	—	35	~1905

Census Appearances

1920

Kings, New …

Spouse, age 48

Kings, New York · implied b. ~1872 — 3 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Costello
Given Name	Mary
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	48
Marital Status	Married
Birthplace	Ireland
Year of Immigration	1885
Naturalization Status	Naturalized
Father's Birthplace	Ireland
Mother's Birthplace	Ireland
Occupation	none
Can Read	Yes
Can Write	Yes
Speaks English	Yes
Mother Tongue	English
Birth Country	Ireland
Year of Naturalization	1890
Birthplace (normalized)	ireland

1930

Kings, New …

Spouse, age 55

Kings, New York · implied b. ~1875 — 6 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Costello
Given Name	Mary
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	55
Marital Status	Married
Birthplace	Ireland
Naturalization Status	Naturalized
Year of Immigration	1887
Age at First Marriage	26
Father's Birthplace	Ireland
Mother's Birthplace	Ireland
Can Read/Write	Yes
Mother Tongue	English
Birth Country	Ireland
Birthplace (normalized)	ireland

1940

Bronx-County, New …

Head, age 66

Bronx-County, New York · implied b. ~1874 — 3 household members

Surname	Costello
Given Name	Mary J.
Relationship to Head	Head
Sex	F
Color / Race	White
Age	66
Marital Status	Widowed
Birthplace	Ireland
1935 Residence (City)	New York
Naturalization Status	Naturalized
Income (1939)	0
Highest Grade	H-4
1935 Residence	New York
Birth Country	Ireland
Birthplace (normalized)	ireland

Model Tree

Linked across censuses

Our Model Tree links Mary Costello 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 Costello

Head · 1940 · age 66 · b. ~1874 · New York

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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 — Bronx-County, New York Open full size

Page Contents

40 people indexed on this census page (nara:1940:m-t0627-02496-00685)

Line	Name	Age	Relation	Occupation	Birthplace
1	Elizabeth Harrington	21	Daughter	Representative	New York
2	Eileen Harrington	18	Daughter	—	New York
3	Mary Roeling	72	Head	—	New York
4	Michael Roeling	86	Father	—	Ireland
5	Anna Roeling	46	Sister	—	New York
6	Bridget Horn	81	Aunt	—	Ireland
7	Patrick Kiernan	60	Head	Agent	Ireland
8	Anna Kiernan	50	Wife	—	Ireland
9	Edmond Kiernan	21	Son	Clerk	New York
10	Rose Marie Kiernan	18	Daughter	—	New York
11	Patricia Kiernan	15	Daughter	—	New York
12	John Kiernan	15	Son	—	New York
13	Harry Meyers	50	Head	Compositor	New York
14	Lida Meyers	43	Wife	—	New York
15	Lida Meyers	17	Daughter	—	New York
16	Valentine Siebert	70	Head	—	Germany
17	Henry Siebert	39	Son	Waiter	New York
18	Christian Siebert	38	Son	Plumbers Helper	New York
19	Conrad Siebert	32	Son	Laborer	New York
20	Mary J. Costello THIS PERSON	66	Head	—	Ireland
21	John Michael Costello	35	Son	Steamfitter	New York
22	Bartholomew O'Rourke	36	Nephew	Information Clerk	Ireland
23	William Graham	34	Head	Engineer	New Jersey
24	Olive Graham	34	Wife	—	New York
25	Anne Graham	11	Daughter	—	New York
26	Edward Hanley	51	Boarder	—	New York
27	Charles Anderson	34	Head	Patrolman	New York
28	Margaret Anderson	37	Wife	—	New York
29	Margaret Mary Anderson	6	Daughter	—	New York
30	Lawrence Anderson	3	Son	—	New York
31	Charles Anderson	2	Son	—	New York
32	Richard Anderson	0	Son	—	New York
33	Frank Kearney	36	Brother-in-law	Clerk	New York
34	John Hamilton	42	Head	Chauffeur	Massachusetts
35	Clare Hamilton	45	Wife	—	New York
36	Katherine Blum	25	Sister-in-law	—	New York
37	Margaret Nelson	69	Head	—	Ireland
38	Fred Nelson	40	Son	Clerk	New York
39	Katherine Nelson	38	Daughter	Secretary	New York
40	Lawrence James	32	Son	Inspector	New York

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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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