Mary Nelson — 1940 US Census Record

Linked across censuses

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

Our Model Tree links this Mary Nelson across the 1920, 1930 and 1940 US Censuses in Kings-County, New York (XGBoost, ~Confirmed) — first a head (b.~1875), then head of a 3-person household.

Age 65 b. ~1875 Female Head Born: Ireland Widowed

1940 Census Record Details

Census Year	1940
Location	Kings-County, New York
Surname	Nelson
Given Name	Mary
Relationship to Head	Head
Sex	F
Color / Race	White
Age	65
Marital Status	Widowed
Birthplace	Ireland
1935 Residence (City)	New York City
1935 Residence (County)	Kings
Naturalization Status	Naturalized
Additional Details
Class of Worker	0
Highest Grade	No 8
1935 Residence	Same House
Birth Country	Ireland
Birthplace (normalized)	ireland
Township / Ward	New York City
Est. Birth Year	~1875

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
Nora Nelson	Daughter	—	35	~1905
Mary Nelson	Head	—	65	~1875
Ernest Nelson	Son	—	33	~1907

Census Appearances

1920

Kings, New …

Spouse, age 40

Kings, New York · implied b. ~1880 — 3 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Nelson
Given Name	Mary
Relationship to Head	wife
Sex	F
Color / Race	White
Age	40
Marital Status	Married
Birthplace	Ireland
Naturalization Status	Un
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
Birthplace (normalized)	ireland

1930

Kings, New …

Spouse, age 55

Kings, New York · implied b. ~1875 — 4 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Nelson
Given Name	Mary
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	55
Marital Status	Married
Birthplace	Ireland
Naturalization Status	Alien
Year of Immigration	1898
Age at First Marriage	19
Father's Birthplace	Ireland
Mother's Birthplace	Ireland
Can Read/Write	Yes
Mother Tongue	English
Birth Country	Ireland
Birthplace (normalized)	ireland

1940

Kings-County, New …

Head, age 65

Kings-County, New York · implied b. ~1875 — 3 household members

Surname	Nelson
Given Name	Mary
Relationship to Head	Head
Sex	F
Color / Race	White
Age	65
Marital Status	Widowed
Birthplace	Ireland
1935 Residence (City)	New York City
1935 Residence (County)	Kings
Naturalization Status	Naturalized
Class of Worker	0
Highest Grade	No 8
1935 Residence	Same House
Birth Country	Ireland
Birthplace (normalized)	ireland

Model Tree

Linked across censuses

Our Model Tree links Mary Nelson 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 Nelson

Head · 1940 · age 65 · b. ~1875 · 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 — Kings-County, New York Open full size

Page Contents

40 people indexed on this census page (nara:1940:m-t0627-02558-00747)

Line	Name	Age	Relation	Occupation	Birthplace
1	Edward Whalen	44	Roomer	Locksmith	New York
2	Louis Lahm	50	Roomer	Factory Work	Germany
3	John Roble	44	Roomer	—	New Jersey
4	Anna Ryan	63	Roomer	—	Ireland
5	Henry O'Neill	67	Head	Clerk	New York
6	Catherine O'Neill	64	Wife	—	New York
7	Catherine O'Neill	29	Daughter	Typist	New York
8	Marie O'Neill	22	Daughter	Receiving Clerk	New York
9	John Murphy	33	Head	Dept Manager	New York
10	Margaret Murphy	31	Wife	—	New York
11	Marie Murphy	4	Daughter	—	New York
12	Anne Murphy	2	Daughter	—	New York
13	Peter Grolio	32	Head	Plasterer	New York
14	Anna Grolio	26	Wife	—	Pennsylvania
15	Gerald Katchinski	8	Step-son	—	Pennsylvania
16	Anthony Castagna	44	Head	Mineral Water Business	New York
17	Helen Castagna	37	Wife	—	New York
18	Richard Castagna	9	Son	—	New York
19	William Meeghan	53	Head	Loader	New York
20	Florence Meeghan	51	Wife	—	New York
21	William Meeghan	25	Son	Loader	New York
22	John Meeghan	16	Son	Loader	New York
23	Grace Meeghan	22	Daughter	Labeler	New York
24	Dorothy Meeghan	20	Daughter	Envelope Operator	New York
25	Edwin Meeghan	15	Son	Order Boy	New York
26	Martha Meeghan	16	Daughter	—	New York
27	Gerard Meeghan	13	Son	—	New York
28	Mary Nelson THIS PERSON	65	Head	—	Ireland
29	Nora Nelson	35	Daughter	Child Nutrition	New York
30	Ernest Nelson	33	Son	Clothing Bus	New York
31	John V. Bonk	54	Head	Account Clerk	New York
32	Ethel Bonk	45	Wife	—	New Jersey
33	Stasia Bonk	75	Mother-in-law	—	Germany
34	John Mcmahon	70	Head	Watchman	Ireland
35	Catherine Mcmahon	70	Wife	—	Ireland
36	Thomas Mcmahon	40	Son	Electric Stat	New York
37	Catherine Mcmahon	38	Daughter	File Clerk	New York
38	Frances Mcmahon	32	Daughter	File Clerk	New York
39	Edward Talbot	46	Head	Clerk	New York
40	Marion Talbot	44	Wife	—	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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