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James Mcmahon — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Erie-County, New York
Our Model Tree links this James Mcmahon across the 1930 and 1940 US Censuses in Erie-County, New York (XGBoost, ~Confirmed) — first a head (b.~1892), then head of a 10-person household.
Age 48
b. ~1892
Male
Head
Born: New York
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Erie-County, New York |
| Surname | McMahon |
| Given Name | James M. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 48 |
| Marital Status | Married |
| Birthplace | New York |
| 1935 Residence (City) | Buffalo city |
| 1935 Residence (County) | Erie |
| Additional Details | |
| Occupation | Freight Cashier |
| Industry | Steam Railroad |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 2400 |
| Highest Grade | H-1 |
| 1935 Residence | New York |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
| Occupation | Freight Cashier |
| Township / Ward | Buffalo City |
| Est. Birth Year | ~1892 |
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 James | Age | Birth yr |
|---|---|---|---|---|
| Betty Mcmahon | Daughter | — | 20 | ~1920 |
| James Mcmahon | Head | — | 48 | ~1892 |
| Harry Thompson | Other | — | 70 | ~1870 |
| Richard Mcmahon | Son | — | 15 | ~1925 |
| Edward Mcmahon | Son | — | 11 | ~1929 |
| Paul Mcmahon | Son | — | 13 | ~1927 |
| Harry Mcmahon | Son | — | 18 | ~1922 |
| James Mcmahon | Son | — | 17 | ~1923 |
| Donald Mcmahon | Son | — | 7 | ~1933 |
| Helen Mcmahon | Spouse | — | 45 | ~1895 |
Census Appearances
1930
Erie, New …
Head, age 37
Erie, New York · implied b. ~1893 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | James M |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 37 |
| Marital Status | Married |
| Birthplace | New York |
| Age at First Marriage | 20 |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Occupation | clerk office |
| Industry | railroad |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 27.00 |
| Radio Set | R |
| Veteran | Yes |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1940
Erie-County, New …
Head, age 48
Erie-County, New York · implied b. ~1892 — 10 household members
| Surname | McMahon |
| Given Name | James M. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 48 |
| Marital Status | Married |
| Birthplace | New York |
| 1935 Residence (City) | Buffalo city |
| 1935 Residence (County) | Erie |
| Occupation | Freight Cashier |
| Industry | Steam Railroad |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 2400 |
| Highest Grade | H-1 |
| 1935 Residence | New York |
| 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 Mcmahon across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
James Mcmahon
Head · 1940 · age 48 · b. ~1892 · 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
39 people indexed on this census page (nara:1940:m-t0627-02823-01060)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Evelyn M. Gretzen | 10 | Daughter | — | New York |
| 42 | Joseph C. Meegan | 36 | Head | Clerk | New York |
| 43 | Beatrice M. Meegan | 32 | Wife | — | New York |
| 44 | Maureen Meegan | 6 | Daughter | — | New York |
| 45 | Sharon A. Meegan | 5 | Daughter | — | New York |
| 46 | Jos Pat Meegan | 4 | Daughter | — | New York |
| 47 | Kevin J. Meegan | 2 | Son | — | New York |
| 48 | Nancy S. Meegan | 1 | Daughter | — | New York |
| 49 | James M. Mcmahon THIS PERSON | 48 | Head | Freight Cashier | New York |
| 50 | Helen J. Mcmahon | 45 | Wife | — | New York |
| 51 | Betty Mcmahon | 20 | Daughter | Bookkeeper | New York |
| 52 | Harry J. Mcmahon | 18 | Son | Stock Clerk | New York |
| 53 | James M. Mcmahon | 17 | Son | Delivery Boy | New York |
| 54 | Richard J. Mcmahon | 15 | Son | — | New York |
| 55 | Paul E. Mcmahon | 13 | Son | — | New York |
| 56 | Edward J. Mcmahon | 11 | Son | — | New York |
| 57 | Donald F. Mcmahon | 7 | Son | — | New York |
| 58 | Harry M. Thompson | 70 | Brother-law | — | New York |
| 59 | Arthur G. Nagel | 46 | Head | Pump Machinist | New York |
| 60 | Anna E. Nagel | 40 | Wife | — | New York |
| 61 | Arthur G. Nagel | 4 | Son | — | New York |
| 62 | Alpheus H. Fisher | 52 | Head | Stationary Engineer | Pennsylvania |
| 63 | Lena J. Fisher | 42 | Wife | — | Pennsylvania |
| 64 | James J. Fisher | 12 | Son | — | Pennsylvania |
| 65 | John H. Waters | 32 | Brother-law | Pipe Fitter | New York |
| 66 | Edward S. Mutka | 59 | Head | Janitor | Czecho Slovakia |
| 67 | Mary Mutka | 52 | Wife | — | Czecho Slovakia |
| 68 | Rose Mutka | 30 | Daughter | Egg Candler | New York |
| 69 | Norbert M. Mutka | 21 | Son | Metallurgist | New York |
| 70 | Edward M. Mutka | 18 | Son | Rougher Steel Mill | New York |
| 71 | John G. Mutka | 17 | Son | — | New York |
| 72 | Elizabeth M. Mutka | 13 | Daughter | — | New York |
| 73 | Joseph J. Mutka | 12 | Son | — | New York |
| 74 | Thomas J. O'Connor | 42 | Head | Pipe Fitter | Ireland |
| 75 | Margaret J. O'Connor | 41 | Wife | — | Ireland |
| 76 | Margaret E. O'Connor | 16 | Daughter | — | New York |
| 77 | Catherine E. O'Connor | 15 | Daughter | — | New York |
| 78 | Andrew M. Borman | 48 | Head | Asst Stationary Engineer | Ireland |
| 79 | Anna P. Borman | 48 | Wife | — | Ireland |
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)