Mary Mcmahon — 1940 US Census Record

Linked across censuses

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

Our Model Tree links this Mary Mcmahon across the 1920, 1930 and 1940 US Censuses in Queens-County, New York (XGBoost, ~Confirmed) — first a head (b.~1873), then head of a 3-person household.

Age 67 b. ~1873 Female Head Born: Ireland Widowed

1940 Census Record Details

Census Year	1940
Location	Queens-County, New York
Surname	McMahon
Given Name	Mary
Relationship to Head	Head
Sex	F
Color / Race	White
Age	67
Marital Status	Widowed
Birthplace	Ireland
1935 Residence (City)	New York
Naturalization Status	Naturalized
Additional Details
Industry	0
Highest Grade	No 8
1935 Residence	New York
Birth Country	Ireland
Birthplace (normalized)	ireland
Township / Ward	New York City
Est. Birth Year	~1873

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
Helen Mcmahon	Daughter	—	36	~1904
Mary Mcmahon	Daughter	—	25	~1915
Mary Mcmahon	Head	—	67	~1873

Census Appearances

1920

Westchester, New …

Spouse, age 47

Westchester, New York · implied b. ~1873 — 2 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	MacMahon
Given Name	Mary
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	47
Marital Status	Married
Birthplace	Ireland
Father's Birthplace	Ireland
Mother's Birthplace	Ireland
Can Read	Yes
Can Write	Yes
Speaks English	Yes
Mother Tongue	Irish
Home Owned/Rented	1903
Birth Country	Ireland
Year of Naturalization	1897
Birthplace (normalized)	ireland

1930

Bronx, New …

Spouse, age 57

Bronx, New York · implied b. ~1873 — 3 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	McMahon
Given Name	Mary
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	57
Marital Status	Married
Birthplace	Ireland
Naturalization Status	Naturalized
Year of Immigration	1885
Age at First Marriage	22
Father's Birthplace	Ireland
Mother's Birthplace	Ireland
Can Read/Write	Yes
Mother Tongue	English
Veteran	No
Birth Country	Ireland
Birthplace (normalized)	ireland

1940

Queens-County, New …

Head, age 67

Queens-County, New York · implied b. ~1873 — 3 household members

Surname	McMahon
Given Name	Mary
Relationship to Head	Head
Sex	F
Color / Race	White
Age	67
Marital Status	Widowed
Birthplace	Ireland
1935 Residence (City)	New York
Naturalization Status	Naturalized
Industry	0
Highest Grade	No 8
1935 Residence	New York
Birth Country	Ireland
Birthplace (normalized)	ireland

Model Tree

Linked across censuses

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

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This person

Anchor record

Mary Mcmahon

Head · 1940 · age 67 · b. ~1873 · 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 — Queens-County, New York Open full size

Page Contents

40 people indexed on this census page (nara:1940:m-t0627-02733-00515)

Line	Name	Age	Relation	Occupation	Birthplace
41	Anna Thomas	14	Daughter	—	New York
42	Frank Port	38	Head	Painter	Germany
43	Sophie Port	34	Wife	—	Germany
44	Sophie Port	9	Daughter	—	New York
45	Mary Mcmahon THIS PERSON	67	Head	—	Ireland
46	Helen Mcmahon	36	Daughter	Clerk	New York
47	Mary J. Mcmahon	25	Daughter	Clerk	New York
48	Patrick Moran	69	Head	Stone Cutter	Ireland
49	Mary Moran	67	Wife	—	Ireland
50	Daniel Moran	36	Son	Broker	New York
51	Patrick Smith	67	Head	—	Ireland
52	Johanna Smith	62	Wife	—	Pennsylvania
53	John J. Flaherty	31	Son in law	Laborer	New York
54	Madeline Flaherty	27	Wife	—	New York
55	Virginia Noe	31	Cousin	Stenographer	New York
56	August F. Erdman	63	Head	Salesman	New York
57	Christina Erdman	44	Wife	Cook	New York
58	Henry A. Erdman	23	Son	Machine Operator	New York
59	Robert G. Erdman	19	Son	Runner	New York
60	Nicola Leone	67	Head	—	Italy
61	Anna Leone	56	Wife	—	Italy
62	Michelina Leone	31	Daughter	Cleaner	New York
63	Joseph Leone	29	Son	Investigator	New York
64	Catherine Leone	23	Daughter	Seamstress	New York
65	John J. Corcoran	48	Head	Operator	New York
66	Katherine Corcoran	47	Wife	—	New York
67	James Corcoran	14	Son	—	New York
68	Ignazio La Rosa	61	Head	Cook	Italy
69	Lillian La Rosa	61	Wife	—	Italy
70	John La Rosa	33	Son	—	New York
71	Rosa La Rosa	29	Daughter	Stenographer	New York
72	Paul Orrico	33	Head	—	New York
73	Lorraine Orrico	32	Wife	—	New York
74	Charles Stofft	41	Head	Butcher	New York
75	Helen Stofft	38	Wife	—	New Jersey
76	John Stofft	14	Son	—	New York
77	Dorothy Stofft	10	Daughter	—	New York
78	Christian Kleffmann	61	Head	Clerk	Germany
79	Kate Kleffmann	60	Wife	—	New York
80	Frank Temesy	59	Head	Sample Maker	Hungary

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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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