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John Mcmahon — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Lucas, Ohio
Our Model Tree links this John Mcmahon across the 1920, 1930 and 1940 US Censuses in Lucas, Ohio (XGBoost, ~Confirmed) — first a head (b.~1869), then head of a 4-person household.
Age 61
b. ~1869
Male
Head
Born: Ohio
Married
1930 Census Record Details
| Census Year | 1930 |
| Location | Lucas, Ohio |
| Surname | McMahon |
| Given Name | John P. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 61 |
| Marital Status | Married |
| Birthplace | Ohio |
| Age at First Marriage | 23 |
| Father's Birthplace | Canada-English |
| Mother's Birthplace | Ireland |
| Additional Details | |
| Occupation | Foreman |
| Industry | Railroad |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 8500 |
| Radio Set | R |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
| Occupation | Foreman |
| Township / Ward | Toledo City |
| Est. Birth Year | ~1869 |
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 1930 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Frances Mcmahon | Daughter | — | 25 | ~1905 |
| Violet Mcmahon | Daughter | — | 22 | ~1908 |
| John Mcmahon | Head | — | 61 | ~1869 |
| Mabel Mcmahon | Other | — | 52 | ~1878 |
Census Appearances
1920
Lucas, Ohio
Head, age 51
Lucas, Ohio · implied b. ~1869 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | John H. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 51 |
| Marital Status | Married |
| Birthplace | Ohio |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Cattle Dealer |
| Industry | Stock |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | O |
| Home Free/Mortgaged | F |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
1930
Lucas, Ohio
Head, age 61
Lucas, Ohio · implied b. ~1869 — 4 household members
| Surname | McMahon |
| Given Name | John P. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 61 |
| Marital Status | Married |
| Birthplace | Ohio |
| Age at First Marriage | 23 |
| Father's Birthplace | Canada-English |
| Mother's Birthplace | Ireland |
| Occupation | Foreman |
| Industry | Railroad |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 8500 |
| Radio Set | R |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
1940
Lucas-County, Ohio
Other, age 71
Lucas-County, Ohio · implied b. ~1869 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | John |
| Relationship to Head | Father |
| Sex | M |
| Color / Race | White |
| Age | 71 |
| Marital Status | Widowed |
| Birthplace | Ohio |
| 1935 Residence (City) | Toledo City |
| 1935 Residence (County) | Lucas |
| Hours Worked | 7 |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
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 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Mcmahon
Head · 1930 · age 61 · b. ~1869 · Ohio
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1930 US Federal Census — Lucas, Ohio
Open full size
1930 US Federal Census — Lucas, Ohio
Page Contents
50 people indexed on this census page (ia:1930:ohiocensus00reel1836:0673)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John P. Mcmahon THIS PERSON | 61 | Head | Foreman | Ohio |
| 2 | Mabel J. Mcmahon | 52 | Wife-H | — | Ohio |
| 3 | Violet Mcmahon | 22 | Daughter | Bookkeeper | Ohio |
| 4 | Frances Mcmahon | 25 | Daughter | Housekeeper | Ohio |
| 5 | Herbert H. Huntley | 28 | Head | Salesman | Illinois |
| 6 | Carol D. Huntley | 26 | Wife-H | — | Illinois |
| 7 | Betty J. Huntley | 4 | Daughter | — | Ohio |
| 8 | Marie Baumgartner | 65 | Mother-in-law | — | Illinois |
| 9 | Samuel E. Otaher | 54 | Head | Bridge Foreman | Ohio |
| 10 | Rose A. Otaher | 55 | Wife-H | — | Ohio |
| 11 | Edna M. Otaher | 42 | Daughter | Stenographer | Ohio |
| 12 | Leota A. Otaher | 20 | Daughter | Teacher | Ohio |
| 13 | Evelyn L. Otaher | 18 | Daughter | — | Ohio |
| 14 | Lenora E. Otaher | 15 | Daughter | — | Ohio |
| 15 | Donald J. O'Brien | 51 | Head | Bookkeeper | Ohio |
| 16 | Octavia M. O'Brien | 51 | Wife-H | — | Ohio |
| 17 | John M. O'Brien | 15 | Son | — | Ohio |
| 18 | Ludwig C. Kurtz | 52 | Head | Manager | Michigan |
| 19 | Christina B. Kurtz | 54 | Wife-H | — | Ohio |
| 20 | Robert W. Kurtz | 11 | Son | — | Ohio |
| 21 | Mildred B. Kurtz | 4 | Daughter | — | Ohio |
| 22 | Emery Edwards | 50 | Head | Dry Cleaner | Ohio |
| 23 | Bernice M. Edwards | 34 | Wife-H | — | Michigan |
| 24 | James E. Edwards | 7 | Son | — | Ohio |
| 25 | Rose E. Edwards | 4 | Daughter | — | Ohio |
| 26 | Harold L. Edwards | 2 | Son | — | Ohio |
| 27 | Gordon R. Edwards | 0 | Son | — | Ohio |
| 28 | Frank H. Wood | 54 | Head | Clerk | Ireland |
| 29 | Eugene Wood | 57 | Wife-H | — | Ohio |
| 30 | Juanita F. Wood | 11 | Daughter | — | Ohio |
| 31 | Elizabeth De Lorenzo | 26 | Daughter | — | Ohio |
| 32 | Andrew F. Staley | 70 | Head | Porter | Ohio |
| 33 | Elizabeth Staley | 71 | Wife-H | — | Ohio |
| 34 | Florence E. Staley | 43 | Daughter | — | Ohio |
| 35 | Lois M. Staley | 41 | Daughter | — | Ohio |
| 36 | Cora Leifer | 51 | Head-H | — | Ohio |
| 37 | Esther Leifer | 28 | Daughter | Telephone Operator | Ohio |
| 38 | Mildred Leifer | 23 | Daughter | Stenographer | Ohio |
| 39 | Agnes Ring | 51 | Sister | Clerk | Ohio |
| 40 | Bernice Peckman | 26 | Daughter | Saleslady | Ohio |
| 41 | Fred Peckman | 33 | Son-in-law | Manager | Ohio |
| 42 | George Ring | 15 | Nephew | — | Ohio |
| 43 | Edward W. De Mars | 37 | Head | Ticket Clerk | Ohio |
| 44 | Mary H. De Mars | 38 | Wife-H | — | Ohio |
| 45 | Dorothy E. De Mars | 19 | Daughter | — | Ohio |
| 46 | Nora D. Astam | 62 | Mother-in-law | — | Ohio |
| 47 | Arthur D. De Mars | 57 | Nephew | Buyer | Pennsylvania |
| 48 | Earl H. Van Wormer | 40 | Head | Foreman | Ohio |
| 49 | Loretta S. Van Wormer | 43 | Wife-H | — | Ohio |
| 50 | George S. Van Wormer | 19 | Son | — | Ohio |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)