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Mary Finn — 1940 US Census Record

Model Tree available

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

Our Model Tree links this Mary Finn across the 1920, 1930 and 1940 US Censuses in Nassau-County, New York (XGBoost, ~Confirmed), with identified parents Louis & Michael — first a daughter (b.~1909), then head of a 12-person household.

Age 31 b. ~1909 Female Daughter Born: New York Single

1940 Census Record Details

Census Year1940
LocationNassau-County, New York
SurnameFinn
Given NameMary
Relationship to HeadDaughter
SexF
Color / RaceWhite
Age31
Marital StatusSingle
BirthplaceNew York
1935 Residence (City)Plainview-Woodbury
1935 Residence (County)Nassau
Additional Details
Class of WorkerH
Income (1939)0
Highest GradeNo 8
1935 ResidenceSame place
Birth StateNew York
Birth CountryUnited States
Birthplace (normalized)new york
Township / WardPlainviewwoodbury
Est. Birth Year~1909

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.

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

Name Relation to head Relative to Mary Age Birth yr
Albert Finn Son — 15 ~1925
Edward Finn Son — 20 ~1920
Mary Finn Daughter — 31 ~1909
Frances Finn Daughter — 27 ~1913
Elizabeth Finn Daughter — 23 ~1917
Bernard Finn Son — 22 ~1918
Catherine Finn Daughter — 14 ~1926
Anna Finn Daughter — 24 ~1916
Margaret Finn Daughter — 17 ~1923
George Finn Son — 26 ~1914
Catherine Finn Spouse — 52 ~1888
Louis Finn Head — 66 ~1874

Census Appearances

1920
New York, …
Daughter, age 9
New York, New York · implied b. ~1911 — 4 household members
●  Primary link · ~Confirmed · 2 sources
XGBoost Household
Surname Finn
Given Name Mary
Relationship to Head Daughter
Sex F
Color / Race White
Age 9
Marital Status Single
Birthplace New York
Father's Birthplace Ireland
Mother's Birthplace Ireland
Can Read Yes
Can Write Yes
Speaks English Yes
Mother Tongue English
Birth State New York
Birth Country United States
Birthplace (normalized) new york
1930
New York, …
Daughter, age 20
New York, New York · implied b. ~1910 — 7 household members
●  Primary link · ~Confirmed · 2 sources
XGBoost Household
Surname Finn
Given Name Mary
Relationship to Head Daughter
Sex F
Color / Race White
Age 20
Marital Status Single
Birthplace New York
Father's Birthplace Ireland
Mother's Birthplace Ireland
Can Read/Write Yes
Birth State New York
Birth Country United States
Birthplace (normalized) new york
1940
Nassau-County, New …
Daughter, age 31
Nassau-County, New York · implied b. ~1909 — 12 household members
Surname Finn
Given Name Mary
Relationship to Head Daughter
Sex F
Color / Race White
Age 31
Marital Status Single
Birthplace New York
1935 Residence (City) Plainview-Woodbury
1935 Residence (County) Nassau
Class of Worker H
Income (1939) 0
Highest Grade No 8
1935 Residence Same place
Birth State New York
Birth Country United States
Birthplace (normalized) new york

Model Tree

An inferred pedigree reconstructed from census links — up to 4 generations within the 1900–1950 window. Closer generations are built from household co-residence; deeper ones are bridged by following a relative to their own childhood census. Confidence compounds and weakens with each generation.
Model Tree available
Our Model Tree links Mary Finn across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Louis Finn (~0.92 confidence) and father Michael Finn (~0.92 confidence) and father William Finn (~0.92 confidence) and mother Catherine Finn (~0.92 confidence) and mother Elizabeth Finn (~0.92 confidence) and mother Mary Finn (~0.92 confidence). The pedigree spans 1 generation with 6 identified ancestors.
Show:
Gen 1 Parents confidence ≈ 0.92
Father
Louis Finn
b. ~1874
Source father
● Household · direct · ~0.92
Father
Michael Finn
b. ~1878
Source father
● Household · direct · ~0.92
Father
William Finn
b. ~1883
Source father
● Household · direct · ~0.92
Mother
Catherine Finn
b. ~1888
Source mother
● Household · direct · ~0.92
Mother
Elizabeth Finn
b. ~1888
Source mother
● Household · direct · ~0.92
Mother
Mary Finn
b. ~1878
Source mother
● Household · direct · ~0.92
This person
Anchor record
Mary Finn
Daughter · 1940 · age 31 · b. ~1909 · New York
★ You are viewing this record
Sibling
Bernard Finn
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Albert Finn
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Finn
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anna Finn
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Finn
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elizabeth Finn
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frances Finn
Sibling · 1940 · age 27
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Finn
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
George Finn
Sibling · 1940 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Confirmed / household (~0.90+) Probable / derived (~0.65–0.89) Candidate (<0.65, unverified)

Original Census Page

1940 US Federal Census — Nassau-County, New York Open full size

Page Contents

40 people indexed on this census page (nara:1940:m-t0627-02694-00030)

Line Name Age Relation Occupation Birthplace
1 Donald Kant 12 Son — New York
2 Mathilda Peterson 80 Mother-in-law — Sweden
3 Joseph Finn 30 Head Laborer New York
4 Rose Finn 28 Wife — New York
5 Louis Finn 66 Head Farmer New York
6 Catherine Finn 52 Wife — New York
7 Mary Finn THIS PERSON 31 Daughter — New York
8 Frances Finn 27 Daughter — New York
9 George Finn 26 Son Laborer New York
10 Anna Finn 24 Daughter — New York
11 Elizabeth Finn 23 Daughter — New York
12 Bernard Finn 22 Son Laborer New York
13 Edward Finn 20 Son Laborer New York
14 Margaret Finn 17 Daughter — New York
15 Albert Finn 15 Son — New York
16 Catherine Finn 14 Daughter — New York
17 Thomas Suttin 45 Head Laborer Germany
18 Henry Froehlich 35 Head Farmer New York
19 Loretta Froehlich 32 Wife — New York
20 Henry Froehlich 9 Son — New York
21 Joseph Froehlich 6 Son — New York
22 Kenneth Froehlich 3 Son — New York
23 John Meijer 23 Head Farmer New York
24 Elizabeth Meijer 46 Wife — New York
25 Elsie Meijer 14 Daughter — New York
26 Mary Schloss 79 Mother-in-law — Germany
27 Fred Bedient 79 Lodger — Connecticut
28 Stephen Meyer 37 Head Farmer New York
29 Margaret Meyer 30 Wife — New York
30 Marjorie Meyer 6 Daughter — New York
31 Annie Meyer 73 Head — New York
32 Madeline Meyer 44 Daughter — New York
33 George Schultz 44 Lodger Mechanic'S Helper New York
34 John Mulford 37 Head Farmer New York
35 Madeline Mulford 35 Wife — New York
36 Madeline Mulford 11 Daughter — New York
37 John Mulford 9 Son — New York
38 Lillian Mulford 7 Daughter — New York
39 Lucille Mulford 4 Daughter — New York
40 Virginia Mulford 2 Daughter — New York

Related Census Records

Search for Mary Finn

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Pedigree Summary

Mary + 9 siblings
Gen 1 · 6 parents ~0.92
Max depth 4 (1900–1950 window)

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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