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John Mcmahon — 1940 US Census Record
Model Tree available1940 United States Federal Census · Essex-County, New York
Our Model Tree links this John Mcmahon across the 1910, 1920, 1930 and 1940 US Censuses in Essex-County, New York (XGBoost, ~Confirmed), with identified parents Ellen & Helen — first a son (b.~1886), then head of a 7-person household.
Age 54
b. ~1886
Male
Son
Born: Colorado
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Essex-County, New York |
| Surname | McMahon |
| Given Name | John X |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 54 |
| Marital Status | Single |
| Birthplace | Colorado |
| 1935 Residence (City) | Westport |
| 1935 Residence (County) | Essex |
| Additional Details | |
| Occupation | Farmer |
| Industry | Mothers farm |
| Class of Worker | OA |
| Hours Worked | 30 |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
| Occupation | Farmer |
| Township / Ward | Westport |
| Est. Birth Year | ~1886 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Kathryn Mcmahon | Daughter | — | 50 | ~1890 |
| Ellen Doyle | Head | — | 90 | ~1850 |
| Margaret Collins | Other | — | 56 | ~1884 |
| Louis Hess | Other | — | 13 | ~1927 |
| Thomas Farrell | Other | — | 16 | ~1924 |
| John Mcmahon | Son | — | 54 | ~1886 |
| Peter Mcmahon | Son | — | 48 | ~1892 |
Census Appearances
1910
Essex, New …
Son, age 25
Essex, New York · implied b. ~1885 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | John C |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Colorado |
| Father's Birthplace | New York |
| Mother's Birthplace | New York |
| Occupation | Laborer |
| Industry | farm |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
1920
Essex, New …
Other, age 36
Essex, New York · implied b. ~1884 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | John P. |
| Relationship to Head | Brother |
| Sex | M |
| Color / Race | White |
| Age | 36 |
| Marital Status | Single |
| Birthplace | Colorado |
| Father's Birthplace | New York |
| Mother's Birthplace | New York |
| Occupation | Farm Laborer |
| Industry | Working Out |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
1930
Essex, New …
Other, age 48
Essex, New York · implied b. ~1882 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | John P. |
| Relationship to Head | Brother |
| Sex | M |
| Color / Race | White |
| Age | 48 |
| Marital Status | Single |
| Birthplace | Colorado |
| Father's Birthplace | New York |
| Mother's Birthplace | New York |
| Occupation | Farm laborer |
| Industry | General farm |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
1940
Essex-County, New …
Son, age 54
Essex-County, New York · implied b. ~1886 — 7 household members
| Surname | McMahon |
| Given Name | John X |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 54 |
| Marital Status | Single |
| Birthplace | Colorado |
| 1935 Residence (City) | Westport |
| 1935 Residence (County) | Essex |
| Occupation | Farmer |
| Industry | Mothers farm |
| Class of Worker | OA |
| Hours Worked | 30 |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
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.
Our Model Tree links John Mcmahon across 4 US Census years (1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Ellen Doyle (~0.92 confidence) and mother Helen Doyle (~0.92 confidence) and father Thomas Doyle (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Ellen Doyle
b. ~1850
Source mother
● Household
· direct · ~0.92
Mother
Helen Doyle
b. ~1853
Source mother
● Household
· direct · ~0.92
Father
Thomas Doyle
b. ~1857
Source father
● Household
· direct · ~0.92
This person
Anchor record
John Mcmahon
Son · 1940 · age 54 · b. ~1886 · New York
★ You are viewing this record
Sibling
Peter Mcmahon
Sibling · 1940 · age 48
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Kathryn Mcmahon
Sibling · 1940 · age 50
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 — Essex-County, New York
Open full size
1940 US Federal Census — Essex-County, New York
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02533-00934)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Raymond W Lawrence | 37 | Head | — | Westport |
| 42 | Caroline X Mooley | 60 | Head | — | Westport |
| 43 | Fannie Slaughter | 65 | Aunt | — | Westport |
| 44 | Ellen Doyle | 90 | Head | — | Westport |
| 45 | John X Mcmahon THIS PERSON | 54 | Son | Farmer | Colorado |
| 46 | Peter Mcmahon | 48 | Son | Farmer | Colorado |
| 47 | Kathryn Mcmahon | 50 | Daughter | — | New York |
| 48 | Louis Hess | 13 | Grandchild | — | New York |
| 49 | Margaret Collins | 56 | Maid | Maid | New York |
| 50 | Thomas Farrell | 16 | B. Son | — | New York |
| 51 | Wm Morrison | 50 | Head | Farmer | Tennessee |
| 52 | Elsie X Morrison | 48 | Wife | — | Iowa |
| 53 | Wm Morrison | 12 | Son | — | New York |
| 54 | Charles X Dunston | 79 | Head | — | Mass |
| 55 | Fred Reynolds | 55 | Head | Farmer | New York |
| 56 | Irene X Reynolds | 50 | Wife | — | New York |
| 57 | Amy Moore | 25 | Daughter | Teacher | New York |
| 58 | Ernest X Peirce | 56 | Head | Farmer | New York |
| 59 | Florence Peirce | 56 | Wife | — | New York |
| 60 | Robert Floyd | 39 | Head | Laborer | New York |
| 61 | Ethel X Floyd | 40 | Wife | — | New York |
| 62 | Carroll X Mason | 39 | Head | Farmer | New York |
| 63 | Archie Swan | 66 | Lodger | — | New York |
| 64 | Lila Mowry | 47 | Lodger | — | New York |
| 65 | Ella May Mowry | 20 | Lodger | — | Ohio |
| 66 | Robert Mowry | 17 | Lodger | — | Ohio |
| 67 | Fannie X Swan | 55 | Head | Farmer | New York |
| 68 | Fred Braine | 54 | Lodger | Laborer | New York |
| 69 | Wm X Bigelow | 48 | Head | Farmer | New York |
| 70 | Elma X Bigelow | 28 | Wife | — | New York |
| 71 | Elacia Bigelow | 5 | Daughter | — | New York |
| 72 | Ann Bigelow | 2 | Daughter | — | New York |
| 73 | Harry Allen | 64 | Head | Farmer | New York |
| 74 | Ralph Allen | 33 | Son | Landscaping | New York |
| 75 | Mabel X Allen | 27 | Sons wife | — | New York |
| 76 | David Allen | 5 | Son | — | New York |
| 77 | Evelyn Allen | 4 | Daughter | — | New York |
| 78 | Frank X Lyon | 60 | Head | Farmer | New York |
| 79 | Walton X Merrill | 42 | Head | Wood Seller | New York |
| 80 | Leo Merrill | 9 | Son | — | New York |
Pedigree Summary
John + 2 siblings
Gen 1 · 3 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)