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William Mcmahon — 1940 US Census Record

Linked across censuses

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

Our Model Tree links this William Mcmahon across the 1930 and 1940 US Censuses in Erie-County, New York (XGBoost, ~Confirmed) — first a son (b.~1928), then head of a 10-person household.

Age 12 b. ~1928 Male Son Born: New York Single

1940 Census Record Details

Census Year1940
LocationErie-County, New York
SurnameMcMahon
Given NameWilliam
Relationship to HeadSon
SexM
Color / RaceWhite
Age12
Marital StatusSingle
BirthplaceNew York
1935 Residence (City)Buffalo City
1935 Residence (County)Erie
Additional Details
Class of Worker0
Highest GradeNo 5
1935 ResidenceSame place
Birth StateNew York
Birth CountryUnited States
Birthplace (normalized)new york
Township / WardBuffalo City
Est. Birth Year~1928

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.

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

Name Relation to head Relative to William Age Birth yr
Grace Mcmahon Spouse — 38 ~1902
Andrew Mcmahon Son — 6 ~1934
Edward Mcmahon Son — 11 ~1929
Joseph Mcmahon Son — 4 ~1936
Martin Mcmahon Son — 9 ~1931
Patricia Mcmahon Daughter — 2 ~1938
William Mcmahon Son — 12 ~1928
Martin Mcmahon Head — 38 ~1902
Marie Teel Other — 40 ~1900
Mary Mcmahon Daughter — 8 ~1932

Census Appearances

1930
Erie, New …
Son, age 1
Erie, New York · implied b. ~1929 — 4 household members
●  Primary link · ~Confirmed · 2 sources
XGBoost Household
Surname McMahon
Given Name William J.
Relationship to Head Son
Sex M
Color / Race White
Age 1
Marital Status Single
Birthplace New York
Father's Birthplace New York
Mother's Birthplace New York
Occupation none
Birth State New York
Birth Country United States
Birthplace (normalized) new york
1940
Erie-County, New …
Son, age 12
Erie-County, New York · implied b. ~1928 — 10 household members
Surname McMahon
Given Name William
Relationship to Head Son
Sex M
Color / Race White
Age 12
Marital Status Single
Birthplace New York
1935 Residence (City) Buffalo City
1935 Residence (County) Erie
Class of Worker 0
Highest Grade No 5
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.
Linked across censuses
Our Model Tree links William Mcmahon across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Mcmahon
Son · 1940 · age 12 · b. ~1928 · New York
★ You are viewing this record
Sibling
Martin Mcmahon
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Andrew Mcmahon
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Mcmahon
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Mcmahon
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Mcmahon
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patricia Mcmahon
Sibling · 1940 · age 2
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 — Erie-County, New York Open full size

Page Contents

36 people indexed on this census page (nara:1940:m-t0627-02823-00087)

Line Name Age Relation Occupation Birthplace
41 Doyle, Ruth Doyle 38 Wife — New York
42 Anthony, Rosemary Doyle 19 Daughter — New York
43 Lottie Orluk 65 Head — Poland
44 Arthur Orluk 28 Son Freight Handler New York
45 Stanley Orluk 20 Son Newspaper New York
46 Frank Orluk 19 Son Shipping Clerk New York
47 Helen Orluk 17 Daughter — New York
48 George Kelsey 52 Lodger Tool Maker New York
49 Alex Hatzis 44 Head Janitor Czechoslovakia
50 Ida Hatzis 39 Wife Charwoman Czechoslovakia
51 Mary Hatzis 16 Daughter — New York
52 Margaret Hatzis 12 Daughter — New York
53 George Beach 46 Head Salesman New York
54 Martha Beach 55 Sister — New York
55 John Rome 26 Head Miller New York
56 Cecilia Rome 19 Wife — New York
57 Mildred Rome 1 Daughter — New York
58 Martin Mcmahon 38 Head Trucker New York
59 Grace Mcmahon 38 Wife — New York
60 William Mcmahon THIS PERSON 12 Son — New York
61 Edward Mcmahon 11 Son — New York
62 Martin Jr. Mcmahon 9 Son — New York
63 Mary Mcmahon 8 Daughter — New York
64 Andrew Mcmahon 6 Son — New York
65 Joseph Mcmahon 4 Son — New York
66 Patricia Mcmahon 2 Daughter — New York
67 Marie Teel 40 Lodger Assistant Manager New York
68 Thomas Browne 60 Head — Ireland
69 Susan Browne 62 Wife — Eire State
70 Thomas Jr. Browne 24 Son School Teacher New York
71 Patrick Neeman 56 Head Operator —
72 Mary E. Neeman 57 Wife — —
73 John Neeman 27 Son Teller New York
74 Thomas Neeman 26 Son Hand Record Clerk New York
75 Mary T. Neeman 23 Daughter Stenographer New York
76 Margaret Neeman 14 Daughter — 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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