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John Mcmahon — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Seminole, Florida
Our Model Tree links this John Mcmahon across the 1930 and 1940 US Censuses in Seminole, Florida (XGBoost, ~Confirmed) — first a son (b.~1919), then head of a 12-person household.
Age 11
b. ~1919
Male
Son
Born: Florida
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Seminole, Florida |
| Surname | McMahon |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Florida |
| Father's Birthplace | South Carolina |
| Mother's Birthplace | Georgia |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | Florida |
| Birth Country | United States |
| Birthplace (normalized) | florida |
| Township / Ward | Forest City Precinct 12 |
| Est. Birth Year | ~1919 |
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.
12 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Rebecca Mcmahon | Daughter | — | 22 | ~1908 |
| Ruby Mcmahon | Daughter | — | 18 | ~1912 |
| Rachel Mcmahon | Daughter | — | 16 | ~1914 |
| Victoria Mcmahon | Daughter | — | 20 | ~1910 |
| Lola Mcmahon | Daughter | — | 24 | ~1906 |
| Elisha Mcmahon | Head | — | 55 | ~1875 |
| Tyeth Mcmahon | Other | — | 1 | ~1929 |
| John Mcmahon | Son | — | 11 | ~1919 |
| Giles Mcmahon | Son | — | 8 | ~1922 |
| William Mcmahon | Son | — | 27 | ~1903 |
| Elisha Mcmahon | Son | — | 9 | ~1921 |
| Ida Mcmahon | Spouse | — | 53 | ~1877 |
Census Appearances
1930
Seminole, Florida
Son, age 11
Seminole, Florida · implied b. ~1919 — 12 household members
| Surname | McMahon |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Florida |
| Father's Birthplace | South Carolina |
| Mother's Birthplace | Georgia |
| Can Read/Write | Yes |
| Birth State | Florida |
| Birth Country | United States |
| Birthplace (normalized) | florida |
1940
Seminole-County, Florida
Other, age 19
Seminole-County, Florida · implied b. ~1921 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahan |
| Given Name | John C |
| Relationship to Head | Stepson |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Florida |
| 1935 Residence (City) | Sanford city |
| 1935 Residence (County) | Seminole |
| Occupation | Helper |
| Industry | Filling Station |
| Class of Worker | PW |
| Hours Worked | 3 |
| Income (1939) | 416 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Florida |
| Birth Country | United States |
| Birthplace (normalized) | florida |
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 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Mcmahon
Son · 1930 · age 11 · b. ~1919 · Florida
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Sibling
Rebecca Mcmahon
Sibling · 1930 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rachel Mcmahon
Sibling · 1930 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elisha Mcmahon
Sibling · 1930 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Victoria Mcmahon
Sibling · 1930 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Giles Mcmahon
Sibling · 1930 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lola Mcmahon
Sibling · 1930 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Mcmahon
Sibling · 1930 · age 27
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ruby Mcmahon
Sibling · 1930 · age 18
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
1930 US Federal Census — Seminole, Florida
Open full size
1930 US Federal Census — Seminole, Florida
Page Contents
50 people indexed on this census page (ia:1930:15thcensus332unit:1121)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Della Drake | 25 | Head | Box Maker | Michigan |
| 52 | Cora E Drake | 22 | Wife | — | Alabama |
| 53 | William Drake | 14 | Son | — | Florida |
| 54 | Frank C Lord | 22 | Head | Manager | New York |
| 55 | George Dean | 21 | Roomer | Helper | New York |
| 56 | Charles H Hudson | 48 | Head | Manager | Alabama |
| 57 | Beulah Hudson | 41 | Wife | — | Alabama |
| 58 | James B Hudson | 22 | Son | Laborer | Alabama |
| 59 | Raymond Hudson | 17 | Son | — | Alabama |
| 60 | Lewis L Hudson | 14 | Son | — | Alabama |
| 61 | Buford Hudson | 11 | Son | — | Alabama |
| 62 | Maitland Hudson | 9 | Son | — | Alabama |
| 63 | Gertrude Hudson | 2 | Daughter | — | Florida |
| 64 | William H Crooker | 34 | Head | Laborer | South Carolina |
| 65 | Alzada Crooker | 15 | Daughter | — | Florida |
| 66 | Roy J Crooker | 13 | Son | — | Florida |
| 67 | Layton S Simmons | 35 | Head | Laborer | South Carolina |
| 68 | Lola Simmons | 13 | Daughter | — | South Carolina |
| 69 | Charles Simmons | 9 | Son | — | South Carolina |
| 70 | Eloise Simmons | 7 | Daughter | — | South Carolina |
| 71 | George Fiddler | 46 | Head | Painter | West Virginia |
| 72 | Nora Fiddler | 36 | Wife | — | West Virginia |
| 73 | Lola Fiddler | 16 | Daughter | — | West Virginia |
| 74 | Elisha Mcmahon | 55 | Head | Laborer | South Carolina |
| 75 | Ida Mcmahon | 53 | Wife | — | Georgia |
| 76 | William Mcmahon | 27 | Son | Chauffeur | Georgia |
| 77 | Lola M Mcmahon | 24 | Daughter | Cook | Georgia |
| 78 | Rebecca Mcmahon | 22 | Daughter | Cook | Georgia |
| 79 | Victoria Mcmahon | 20 | Daughter | Cook | Georgia |
| 80 | Ruby Mcmahon | 18 | Daughter | — | Georgia |
| 81 | Rachel Mcmahon | 16 | Daughter | — | Florida |
| 82 | John Mcmahon THIS PERSON | 11 | Son | — | Florida |
| 83 | Elisha J Mcmahon | 9 | Son | — | Florida |
| 84 | Giles Mcmahon | 8 | Son | — | Florida |
| 85 | Tyeth Elmer Mcmahon | 1 | Grand Son | — | Florida |
| 86 | James Fletcher | 32 | Head | Common Laborer | South Carolina |
| 87 | Minerva Fletcher | 27 | Wife | — | Alabama |
| 88 | Roosevelt Miller | 12 | Brother in law | — | Alabama |
| 89 | John Campbell | 50 | Head | Farmer | Florida |
| 90 | Sophie L Campbell | 49 | Wife | — | Florida |
| 91 | Wilson John L Campbell | 12 | Grand Son | — | Florida |
| 92 | William B Handel | 61 | Head | Manager | Michigan |
| 93 | Rose Handel | 41 | Wife | — | Michigan |
| 94 | Stanley Handel | 10 | Son | — | California |
| 95 | Abbie Handel | 8 | Daughter | — | Florida |
| 96 | Richard Handel | 6 | Son | — | Florida |
| 97 | Ellen Handel | 4 | Daughter | — | Florida |
| 98 | Albert L Hoover | 58 | Head | Contractor | Illinois |
| 99 | Florence R Hoover | 48 | Wife | — | Canada-English |
| 100 | Howard B Dean | 27 | Roomer | — | Michigan |
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)