John Mcmahon — 1940 US Census Record

Linked across censuses

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

Our Model Tree links this John Mcmahon across the 1920, 1930 and 1940 US Censuses in New-York-County, New York (XGBoost, ~Confirmed) — first a head (b.~1868), then head of a 3-person household.

Age 72 b. ~1868 Male Head Born: SCOTLAND Married

1940 Census Record Details

Census Year	1940
Location	New-York-County, New York
Surname	MCMAHON
Given Name	JOHN
Relationship to Head	HEAD
Sex	M
Color / Race	White
Age	72
Marital Status	Married
Birthplace	SCOTLAND
1935 Residence (City)	NEW YORK
1935 Residence (County)	NEW YORK
Naturalization Status	Naturalized
Additional Details
Occupation	GROCERY-MAN
Class of Worker	PW
Hours Worked	40
Highest Grade	No 4
1935 Residence	Same place
Birth Country	Scotland
Birthplace (normalized)	scotland
Occupation	Grocery-Man
Township / Ward	New York
Est. Birth Year	~1868

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 John	Age	Birth yr
John Mcmahon	Head	—	72	~1868
Francis Mcmahon	Son	—	40	~1900
Mary Mcmahon	Spouse	—	72	~1868

Census Appearances

1920

New York, …

Spouse, age 54

New York, New York · implied b. ~1866 — 3 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	McMahon
Given Name	John
Relationship to Head	Husband
Sex	M
Color / Race	White
Age	54
Marital Status	Married
Birthplace	Scotland
Naturalization Status	Un
Father's Birthplace	Scotland
Mother's Birthplace	Scotland
Occupation	Stone Cutter
Industry	Marble Wk
Class of Worker	W
Can Read	Yes
Can Write	Yes
Speaks English	Yes
Mother Tongue	Scotch
Birth Country	Scotland
Birthplace (normalized)	scotland

1930

New York, …

Head, age 62

New York, New York · implied b. ~1868 — 7 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	McMahon
Given Name	John
Relationship to Head	Head
Sex	M
Color / Race	White
Age	62
Marital Status	Married
Birthplace	Scotland
Naturalization Status	Naturalized
Year of Immigration	1891
Age at First Marriage	26
Father's Birthplace	Scotland
Mother's Birthplace	Ireland
Occupation	Grocery
Industry	Store
Class of Worker	E
Can Read/Write	Yes
Mother Tongue	English
Home Owned/Rented	R
Home Value / Rent	55
Veteran	No
Birth Country	Scotland
Birthplace (normalized)	scotland

1940

New-York-County, New …

Head, age 72

New-York-County, New York · implied b. ~1868 — 3 household members

Surname	MCMAHON
Given Name	JOHN
Relationship to Head	HEAD
Sex	M
Color / Race	White
Age	72
Marital Status	Married
Birthplace	SCOTLAND
1935 Residence (City)	NEW YORK
1935 Residence (County)	NEW YORK
Naturalization Status	Naturalized
Occupation	GROCERY-MAN
Class of Worker	PW
Hours Worked	40
Highest Grade	No 4
1935 Residence	Same place
Birth Country	Scotland
Birthplace (normalized)	scotland

Model Tree

Linked across censuses

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

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This person

Anchor record

John Mcmahon

Head · 1940 · age 72 · b. ~1868 · 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 — New-York-County, New York Open full size

Page Contents

40 people indexed on this census page (nara:1940:m-t0627-02632-00799)

Line	Name	Age	Relation	Occupation	Birthplace
41	Marie Cazeaux	40	HEAD	Packer	FRANCE
42	Isabell Cazeaux	14	DAUGHTER	—	NEW YORK
43	Albert Constanty	43	HEAD	Box-Maker	FRANCE
44	Louise Constanty	50	WIFE	Floor Lady	FRANCE
45	John Mcmahon THIS PERSON	72	HEAD	Grocery-Man	SCOTLAND
46	Mary Mcmahon	72	WIFE	—	NORTHERN IRELAND
47	Francis Mcmahon	40	SON	Grocery-Man	NEW YORK
48	Antonio Georgiadis	36	HEAD	Counter-Clerk	EGYPT
49	Josephine Georgiadis	25	WIFE	—	PENNSYLVANIA
50	Edward Georgiadis	7	SON	—	PENNSYLVANIA
51	Peter Georgiadis	1	SON	—	NEW YORK
52	James Murphy	70	HEAD	Laborer	EIRE
53	Anna Murphy	30	WIFE	—	EIRE
54	John J Murphy	2	SON	—	NEW YORK
55	Patrick G Murphy	0	SON	—	NEW YORK
56	Annie Hyndmen	59	HEAD	—	SCOTLAND
57	Andrew Hyndmen	33	SON	—	CONNECTICUT
58	Joseph Hyndmen	22	SON	Usher	SCOTLAND
59	Agnes Void	None	DAUGHTER	—	SAME PLACE
60	William Void	21	SON	Laborer	NEW YORK
61	Margaret Void	18	DAUGHTER	New Worker	NEW YORK
62	Anna Void	16	DAUGHTER	—	NEW YORK
63	James Gordon	37	HEAD	Long Shoreman	NEW YORK
64	Marion Gordon	28	WIFE	—	NEW YORK
65	Edward Gordon	12	SON	—	NEW YORK
66	John Gordon	11	SON	—	NEW YORK
67	Marion Gordon	8	DAUGHTER	—	NEW YORK
68	Margaret Gordon	4	DAUGHTER	—	NEW YORK
69	John Poskovich	47	HEAD	Candy-Cigar	JUGOSLAVIA
70	Dessie Poskovich	41	WIFE	Candy-Cigar	AUSTRIA
71	John Reagan	38	LODGER	Helper-Truck	NEW JERSEY
72	Esther Reagan	38	LODGER	—	PENNSYLVANIA
73	Anieli Eskries	52	HEAD	—	POLAND
74	Karl Hichel	55	LODGER	Cook	CZECHO-SLOVAK
75	Margaret York	44	HEAD	—	NEW YORK
76	George York	26	SON	Laborer	NEW YORK
77	Matthew York	19	SON	New Worker	NEW YORK
78	Margaret York	17	DAUGHTER	—	NEW YORK
79	Thomas York	14	SON	—	NEW YORK
80	Edward Storck	24	HEAD	Butcher	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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