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William Mcmahon — 1920 US Census Record

Linked across censuses

1920 United States Federal Census · Ontario, New York

Our Model Tree links this William Mcmahon across the 1900, 1910, 1920 and 1930 US Censuses in Ontario, New York (XGBoost, ~Confirmed) — first a head (b.~1866), then head of a 3-person household.

Age 54 b. ~1866 Male Head Born: New York Widowed

1920 Census Record Details

Census Year1920
LocationOntario, New York
SurnameMcMahon
Given NameWilliam
Relationship to HeadHead
SexM
Color / RaceWhite
Age54
Marital StatusWidowed
BirthplaceNew York
Father's BirthplaceIreland
Mother's BirthplaceIreland
Additional Details
OccupationFarmer
IndustryGeneral Farm
Can ReadYes
Can WriteYes
Speaks EnglishYes
Home Owned/RentedR
Birth StateNew York
Birth CountryUnited States
Birthplace (normalized)new york
OccupationFarmer
Township / WardCanandaigua City
Est. Birth Year~1866

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 1920 census.

Name Relation to head Relative to William Age Birth yr
William Mcmahon Head — 54 ~1866
William Mcmahon Son — 22 ~1898
Florence Mcmahon Daughter — 15 ~1905

Census Appearances

1900
Ontario, New …
Head, age 36
Ontario, New York · implied b. ~1864 — 6 household members
●  Primary link · ~Confirmed · 2 sources
XGBoost Household
Surname McMahon
Given Name William
Relationship to Head Head
Sex M
Color / Race White
Age 35
Marital Status Married
Birthplace New York
Birth Month Oct
Birth Year 1864
Father's Birthplace Ireland
Mother's Birthplace Ireland
Occupation Farmer
Can Read Yes
Can Write Yes
Speaks English Yes
Birth State New York
Birth Country United States
Birthplace (normalized) new york
1910
Ontario, New …
Head, age 45
Ontario, New York · implied b. ~1865 — 5 household members
●  Primary link · ~Confirmed · 2 sources
XGBoost Household
Surname McMahon
Given Name William
Relationship to Head Head
Sex M
Color / Race White
Age 45
Marital Status Widowed
Birthplace New York
Father's Birthplace Ireland
Mother's Birthplace Ireland
Occupation Farmer
Industry General Farm
Can Read Yes
Can Write Yes
Speaks English English
Birth State New York
Birth Country United States
Birthplace (normalized) new york
1920
Ontario, New …
Head, age 54
Ontario, New York · implied b. ~1866 — 3 household members
Surname McMahon
Given Name William
Relationship to Head Head
Sex M
Color / Race White
Age 54
Marital Status Widowed
Birthplace New York
Father's Birthplace Ireland
Mother's Birthplace Ireland
Occupation Farmer
Industry General Farm
Can Read Yes
Can Write Yes
Speaks English Yes
Home Owned/Rented R
Birth State New York
Birth Country United States
Birthplace (normalized) new york
1930
Ontario, New …
Other, age 65
Ontario, New York · implied b. ~1865 — 2 household members
●  Primary link · ~Confirmed · 2 sources
XGBoost Household
Surname McMahon
Given Name William
Relationship to Head Lodger
Sex M
Color / Race White
Age 65
Marital Status Widowed
Birthplace New York
Age at First Marriage 24
Father's Birthplace Irish Free State
Mother's Birthplace Irish Free State
Occupation Farmer
Industry Farm
Class of Worker OA
Can Read/Write Yes
Veteran No
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 4 US Census years (1900, 1910, 1920 and 1930) in Ontario, New York, using XGBoost record linkage.
Show:
This person
Anchor record
William Mcmahon
Head · 1920 · age 54 · b. ~1866 · New York
★ You are viewing this record
Confirmed / household (~0.90+) Probable / derived (~0.65–0.89) Candidate (<0.65, unverified)

Original Census Page

1920 US Federal Census — Ontario, New York Open full size

Page Contents

50 people indexed on this census page (ia:1920:14thcensusofpopu1250unit:0787)

Line Name Age Relation Occupation Birthplace
1 Henry J Nass 63 Head Farmer Ireland
2 Elizabeth Nass 63 Wife — Scotland
3 Benjamin Miles 57 Head Laborer New York
4 Deal Miles 56 Wife — New York
5 August B Vale 27 Head Farmer New York
6 Ethel M Vale 22 Wife — New York
7 Harry W Brown 31 Head Farmer New York
8 Julia M Brown 29 Wife — New York
9 Dorothy Brown 2 Daughter — New York
10 Stuart E Stark 9 Nephew — New York
11 Henry Norton 69 Uncle Mail Carrier New York
12 William Mcmahon THIS PERSON 54 Head Farmer New York
13 Florence Mcmahon 15 Daughter — New York
14 William Mcmahon 22 Son Laborer New York
15 Lester P Bliss 44 Head Farmer Missouri
16 Ada Bliss 41 Wife — New York
17 L Henrietta Bliss 19 Son Laborer New York
18 Helen L Bliss 17 Daughter — New York
19 Ruth G Bliss 15 Daughter — New York
20 Harland P Bliss 11 Son — New York
21 Clarence A Dombau 24 Hired Man Laborer New York
22 Rollin M Pierce 24 Head Farmer New York
23 Alice M Pierce 21 Wife — New York
24 Frank B Corry 32 Head Merchant New York
25 Hazel P Corry 28 Wife — New York
26 Jane G Corry 6 Daughter — New York
27 Addison B Corry 2 Son — New York
28 Amanda V Donnelly 66 Hired Aunt Dressmaker New York
29 Louis Grei 41 Head Farmer New York
30 Helen A Grei 39 Wife — New York
31 Jessie A Grei 7 Daughter — New York
32 Lois I Grei 4 Daughter — New York
33 Rufus Durand 82 Head Farmer New York
34 Ann M Durand 82 Wife — New York
35 William Graham 23 Hired Man Laborer New York
36 Charles W Coombs 37 Head Farmer New York
37 Eva M Coombs 23 Wife — Michigan
38 Irene S Coombs 6 Daughter — New York
39 Helen B Coombs 2 Daughter — New York
40 William G Corcer 40 Head Farmer New York
41 Grace M Corcer 30 Wife — New York
42 Fred W Northrup 10 Step Daughter — New York
43 Ione M Northrup 8 Step Daughter — New York
44 Emily E Corcer 2 Daughter — New York
45 John Woodward 24 Brother in law Laborer New York
46 Leon Smith 32 Head Farmer New York
47 Lillian M Smith 30 Wife — New York
48 Byron B Eddy 13 Orphan — New York
49 R Melvin Pierce 69 Head Farmer New York
50 Ida M Pierce 53 Wife — New York

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About This Record & Model Tree

This record was independently indexed by YourRoots from the 1920 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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