JM
James Mahoney — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Erie-County, New York
Our Model Tree links this James Mahoney across the 1920, 1930 and 1940 US Censuses in Erie-County, New York (XGBoost, ~Confirmed) — first a head (b.~1867), then head of a 4-person household.
Age 73
b. ~1867
Male
Head
Born: Illinois
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Erie-County, New York |
| Surname | Mahoney |
| Given Name | James T. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 73 |
| Marital Status | Widowed |
| Birthplace | Illinois |
| 1935 Residence (City) | Buffalo city |
| 1935 Residence (County) | Erie |
| Additional Details | |
| Industry | 0 |
| Class of Worker | 0 |
| Income (1939) | 0 |
| Highest Grade | No C1 |
| 1935 Residence | Same house |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Buffalo City |
| Est. Birth Year | ~1867 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| John Mahoney | Son | — | 26 | ~1914 |
| Thomas Mccarthy | Other | — | 30 | ~1910 |
| James Mahoney | Head | — | 73 | ~1867 |
| Anna Mccarthy | Daughter | — | 30 | ~1910 |
Census Appearances
1920
Erie, New …
Head, age 52
Erie, New York · implied b. ~1868 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | James J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 52 |
| Marital Status | Married |
| Birthplace | Illinois |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Merchant |
| Industry | U.S. Gov W |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | O |
| Home Free/Mortgaged | M |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Erie, New …
Head, age 63
Erie, New York · implied b. ~1867 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | James J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 63 |
| Marital Status | Married |
| Birthplace | Illinois |
| Age at First Marriage | 25 |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | letter carrier |
| Industry | U. S. government |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 4000 |
| Radio Set | R |
| Veteran | No |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Erie-County, New …
Head, age 73
Erie-County, New York · implied b. ~1867 — 4 household members
| Surname | Mahoney |
| Given Name | James T. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 73 |
| Marital Status | Widowed |
| Birthplace | Illinois |
| 1935 Residence (City) | Buffalo city |
| 1935 Residence (County) | Erie |
| Industry | 0 |
| Class of Worker | 0 |
| Income (1939) | 0 |
| Highest Grade | No C1 |
| 1935 Residence | Same house |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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 James Mahoney across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
James Mahoney
Head · 1940 · age 73 · b. ~1867 · 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 — Erie-County, New York
Open full size
1940 US Federal Census — Erie-County, New York
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02824-00294)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Elizabeth Langdon | 2 | Daughter | — | New York |
| 2 | Fred Langdon | 0 | Son | — | New York |
| 3 | Robert Fitzpatrick | 50 | Head | Fireman | Michigan |
| 4 | Minnie Fitzpatrick | 49 | Wife | — | New York |
| 5 | Daniel C. Martin | 32 | Head | Mill Operator | New York |
| 6 | Lina Martin | 28 | Wife | — | New York |
| 7 | Catherine Hathaway | 76 | Roomer | — | New York |
| 8 | Edward A. O'Brien | 45 | Head | Fireman | New York |
| 9 | Mary E. O'Brien | 45 | Wife | — | New York |
| 10 | Marie X. O'Brien | 5 | Daughter | — | New York |
| 11 | James T. Mahoney THIS PERSON | 73 | Head | — | Illinois |
| 12 | Anna Mccarthy | 30 | Daughter | Trade Teacher | New York |
| 13 | Thomas Mccarthy | 30 | Son-in-law | Foreman | New York |
| 14 | John Mahoney | 26 | Son | Senior Clerk | New York |
| 15 | Arthur Bagley | 61 | Head | Head Porter | New York |
| 16 | Lillian Bagley | 59 | Wife | — | New York |
| 17 | Charles P. Ryan | 71 | Head | — | New York |
| 18 | George Jansen | 57 | Head | Storekeeper | New York |
| 19 | Mary Jansen | 55 | Wife | — | New York |
| 20 | John Moore | 63 | Brother-in-law | Painter | New York |
| 21 | Daniel M. Condren | 60 | Head | Lieutenant | New York |
| 22 | Marie Condren | 58 | Wife | — | New York |
| 23 | Robert Condren | 12 | Son | — | New York |
| 24 | Alice C. Brent | 59 | Sister-in-law | Matron | New York |
| 25 | Ruth Murray | 25 | Daughter-in-law | — | New York |
| 26 | Robert Murray | 6 | Grandson | — | New York |
| 27 | Madonna Murray | 4 | Granddaughter | — | New York |
| 28 | William Murray | 2 | Grandson | — | New York |
| 29 | James Mcmahon | 28 | Head | Millwright | New York |
| 30 | Eileen Mcmahon | 27 | Wife | — | New York |
| 31 | Maureen Mcmahon | 5 | Daughter | — | New York |
| 32 | Marjorie Mcmahon | 2 | Daughter | — | New York |
| 33 | Edward Mcmahon | 0 | Son | — | New York |
| 34 | Earl Troob | 23 | Head | Checker | New York |
| 35 | Ruth Troob | 25 | Wife | — | New York |
| 36 | John Van Updorp | 29 | Head | Attendant | New York |
| 37 | Mildred Van Updorp | 26 | Wife | Billing Clerk | New York |
| 38 | Alexander Cahill | 49 | Head | Attendant | Canada English |
| 39 | Olive Cahill | 46 | Wife | — | Canada English |
| 40 | Gerard Cahill | 19 | Son | Attendant | Canada English |
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)