Mary Leahy — 1940 US Census Record

Linked across censuses

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

Our Model Tree links this Mary Leahy across the 1920, 1930 and 1940 US Censuses in Bronx-County, New York (XGBoost, ~Confirmed) — first a spouse (b.~1881), then head of a 3-person household.

Age 59 b. ~1881 Female Spouse Born: Ireland Married

1940 Census Record Details

Census Year	1940
Location	Bronx-County, New York
Surname	Leahy
Given Name	Mary
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	59
Marital Status	Married
Birthplace	Ireland
1935 Residence (City)	New York
1935 Residence (County)	Bronx
Naturalization Status	Naturalized
Additional Details
Highest Grade	No 8
1935 Residence	New York
Birth Country	Ireland
Birthplace (normalized)	ireland
Township / Ward	New York City
Est. Birth Year	~1881

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
John Leahy	Son	—	23	~1917
William Leahy	Head	—	57	~1883
Mary Leahy	Spouse	—	59	~1881

Census Appearances

1920

Kings, New …

Other, age 35

Kings, New York · implied b. ~1885 — 4 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Leahy
Given Name	Mary
Relationship to Head	Servant
Sex	F
Color / Race	White
Age	35
Marital Status	Single
Birthplace	Ireland
Year of Immigration	1904
Naturalization Status	Alien
Father's Birthplace	Ireland
Mother's Birthplace	Ireland
Can Read	Yes
Can Write	Yes
Speaks English	Yes
Mother Tongue	English
Birth Country	Ireland
Birthplace (normalized)	ireland

1930

Kings, New …

Other, age 49

Kings, New York · implied b. ~1881 — 3 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Leahy
Given Name	Mary A.
Relationship to Head	Wife-H
Sex	F
Color / Race	White
Age	49
Marital Status	Married
Birthplace	Ireland
Naturalization Status	Naturalized
Year of Immigration	1903
Age at First Marriage	25
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 …

Spouse, age 59

Bronx-County, New York · implied b. ~1881 — 3 household members

Surname	Leahy
Given Name	Mary
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	59
Marital Status	Married
Birthplace	Ireland
1935 Residence (City)	New York
1935 Residence (County)	Bronx
Naturalization Status	Naturalized
Highest Grade	No 8
1935 Residence	New York
Birth Country	Ireland
Birthplace (normalized)	ireland

Model Tree

Linked across censuses

Our Model Tree links Mary Leahy 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 Leahy

Spouse · 1940 · age 59 · b. ~1881 · 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-t0627-02492-00576)

Line	Name	Age	Relation	Occupation	Birthplace
1	Max Kaufman	42	Head	Beautician	New York
2	Sonia Kaufman	38	Wife	Beautician	Russia
3	Edward Kaufman	3	Son	—	New York
4	Gene Feinstin	21	Neice	Beautician	Russia
5	Jack Feinstin	19	Nephew	Restaurant Waiter	New York
6	Walter Lowe	22	Head	Show Room Man	Massachusetts
7	Florence Lowe	29	Wife	—	New York
8	Walter Jr. Lowe	2	Son	—	New York
9	Florence Conover	67	Mother	—	New York
10	Maude Brabham	62	Aunt	—	New York
11	Gilbert Nelson	53	Head	Salesman	New York
12	Anna Nelson	53	Wife	—	New York
13	Richard Nelson	16	Son	—	New York
14	Mary Vanek	23	Wife	—	New York
15	Charles Vanek	27	Head	Clerk	New York
16	Marilynn Vanek	1	Daughter	—	New York
17	William Leahy	57	Head	Guard	Ireland
18	Mary Leahy THIS PERSON	59	Wife	—	Ireland
19	John Leahy	23	Son	Bookkeeper	New York
20	John Hofmann	54	Head	Machinist Engineer	Germany
21	Marie Hofmann	52	Wife	—	Germany
22	Otto Hofmann	27	Son	—	New Jersey
23	Harry Mooney	44	Head	Patrolman	New York
24	Martha Mooney	47	Wife	—	New York
25	Rita Mooney	11	Daughter	—	New York
26	Frank Roberts	40	Head	Collector	Eng. Midwest
27	Jeane Roberts	32	Wife	—	New York
28	Frank Jr. Roberts	6	Son	—	New York
29	Andrew Roberts	4	Son	—	New York
30	Elisabeth Maxwell	50	Mother	—	North Ireland
31	Charles Mclaughan	52	Head	Harbor Master	Massachusetts
32	Jenney Mclaughan	47	Wife	—	New York
33	Edna Mclaughan	23	Daughter	Stenographer	Providence, R.I.
34	Mildred Mclaughan	18	Daughter	Mail Room	Providence, R.I.
35	Harold Robbins	43	Head	Developing	New York
36	Mary Robbins	34	Wife	—	Pennsylvania
37	Harold Robbins	2	Son	—	New York
38	Edward T. O'Hara	71	Head	—	New York
39	Edward A. O'Hara	40	Son	Trader	New York
40	Dorothy Harrison	43	Head	Clerk	Missouri

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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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