JM
James Mahoney — 1940 US Census Record
Model Tree available1940 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), with identified parents James & Ellen — first a head (b.~1898), then head of a 3-person household.
Age 42
b. ~1898
Male
Head
Born: New York
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Erie-County, New York |
| Surname | Mahoney |
| Given Name | James J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 42 |
| Marital Status | Married |
| Birthplace | New York |
| 1935 Residence (City) | Buffalo city |
| 1935 Residence (County) | Erie |
| Additional Details | |
| Occupation | Physical Training Instructor |
| Industry | Park City Dept. |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 1800 |
| Highest Grade | H 4 |
| 1935 Residence | Same Place |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
| Occupation | Physical Training Instructor |
| Township / Ward | Buffalo City |
| Est. Birth Year | ~1898 |
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 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| James Mahoney | Son | — | 13 | ~1927 |
| James Mahoney | Head | — | 42 | ~1898 |
| Marie Mahoney | Spouse | — | 39 | ~1901 |
Census Appearances
1920
Erie, New …
Son, age 21
Erie, New York · implied b. ~1899 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | James J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Pennsylvania |
| Occupation | Iron Worker |
| Industry | Steel Co |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1930
Erie, New …
Head, age 32
Erie, New York · implied b. ~1898 — 3 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 | 32 |
| Marital Status | Married |
| Birthplace | New York |
| Age at First Marriage | 26 |
| Father's Birthplace | Illinois |
| Mother's Birthplace | New York |
| Occupation | Playground |
| Industry | City |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 6500 |
| Radio Set | R |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1940
Erie-County, New …
Head, age 42
Erie-County, New York · implied b. ~1898 — 3 household members
| Surname | Mahoney |
| Given Name | James J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 42 |
| Marital Status | Married |
| Birthplace | New York |
| 1935 Residence (City) | Buffalo city |
| 1935 Residence (County) | Erie |
| Occupation | Physical Training Instructor |
| Industry | Park City Dept. |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 1800 |
| Highest Grade | H 4 |
| 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.
Our Model Tree links James Mahoney across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father James Mahoney (~0.92 confidence) and mother Ellen Mahoney (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
James Mahoney
b. ~1868
Source father
● Household
· direct · ~0.92
Mother
Ellen Mahoney
b. ~1871
Source mother
● Household
· direct · ~0.92
This person
Anchor record
James Mahoney
Head · 1940 · age 42 · b. ~1898 · New York
★ You are viewing this record
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-t0627-02836-00661)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Theo (X) Ellerstein | 53 | Head | Salesman | New York |
| 2 | Rose Ellerstein | 37 | Wife | Clerk | New York |
| 3 | Wilford N (X) Fuge | 39 | Head | Surgeon | Pennsylvania |
| 4 | Mildred W. Fuge | 34 | Wife | — | Canada-English |
| 5 | Roy J. (X) Camp | 57 | Head | Cost Accountant | Pennsylvania |
| 6 | Lois M. Camp | 34 | Wife | Sales-Lady | Pennsylvania |
| 7 | Clifford W. Beam | 41 | Head | Bank Clerk | Canada-English |
| 8 | Rhea E. Beam | 41 | Wife | Bank Clerk | Canada-English |
| 9 | Douglas Beam | 13 | Son | — | New York |
| 10 | Edgar (X) Halley | 45 | Head | Lawyer | New York |
| 11 | Ruth E. Halley | 41 | Wife | — | New York |
| 12 | Nancy F. Halley | 16 | Daughter | — | New York |
| 13 | Helen B. Millman | 54 | Head | Sewing | England |
| 14 | Loreen E. Millman | 25 | Daughter | Secretary | Canada-English |
| 15 | Irving H. Carson | 30 | Head | Tire Inspector | New York |
| 16 | Betty (X) Carson | 27 | Wife | Office Clerk | New York |
| 17 | Harold F. (X) Morin | 47 | Head | Repairman | New York |
| 18 | Bessie C. Morin | 42 | Wife | — | New York |
| 19 | Robert F. Morin | 14 | Son | — | New York |
| 20 | William T. Morin | 11 | Son | — | New York |
| 21 | Mary F. (X) Bennett | 36 | Head | Secretary | Pennsylvania |
| 22 | Christina Bennett | 31 | Sister | Secretary | Pennsylvania |
| 23 | Jennie Ehrlich | 54 | Head | — | Russia |
| 24 | Sadie (X) Ehrlich | 36 | Daughter | Stenographer | Russia |
| 25 | Irving Ehrlich | 30 | Son | Gas Station Attendant | New York |
| 26 | Sylvia Ehrlich | 25 | Daughter | — | New York |
| 27 | Frank Ehrlich | 4 | Grandson | — | New York |
| 28 | William E. (X) O'Heen | 41 | Head | Clerk | New York |
| 29 | Mildred F. (X) O'Heen | 39 | Wife | School Teacher | New York |
| 30 | William C. O'Heen | 12 | Son | — | New York |
| 31 | Donna O'Heen | 8 | Daughter | — | New York |
| 32 | Dorothy Schaeffer | 25 | Maid | House Maid | Pennsylvania |
| 33 | Lloyd C. (X) Donaldson | 39 | Head | Mechanic | Pennsylvania |
| 34 | Bernice M. Donaldson | 40 | Wife | — | New York |
| 35 | William F. Donaldson | 3 | Son | — | New York |
| 36 | Mary G. Ellsworth | 30 | Lodger | Clerk | New York |
| 37 | James J. Mahoney THIS PERSON | 42 | Head | Physical Training Instructor | New York |
| 38 | Marie F. Mahoney | 39 | Wife | — | New York |
| 39 | James J. Mahoney | 13 | Son | — | New York |
| 40 | Louise M. Schultz | 33 | Head | Proprietor Hair-Dresser | New York |
Pedigree Summary
James
Gen 1 · 2 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)