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John Mcmahon — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Hamilton, Illinois
Our Model Tree links this John Mcmahon across the 1920, 1930 and 1940 US Censuses in Hamilton, Illinois (XGBoost, ~Confirmed) — first a head (b.~1865), then head of a 5-person household.
Age 65
b. ~1865
Male
Head
Born: Illinois
Married
1930 Census Record Details
| Census Year | 1930 |
| Location | Hamilton, Illinois |
| Surname | McMahon |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 65 |
| Marital Status | Married |
| Birthplace | Illinois |
| Age at First Marriage | 23 |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Additional Details | |
| Occupation | Farmer |
| Industry | General Farm |
| Class of Worker | O |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Farmer |
| Township / Ward | Mayberry Township Part Of |
| Est. Birth Year | ~1865 |
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.
5 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Mcmahon | Head | — | 65 | ~1865 |
| Alice Mcmahon | Other | — | 67 | ~1863 |
| Ben Mcmahon | Son | — | 23 | ~1907 |
| Frank Mcmahon | Son | — | 41 | ~1889 |
| Alton Mcmahon | Son | — | 21 | ~1909 |
Census Appearances
1920
Hamilton, Illinois
Head, age 56
Hamilton, Illinois · implied b. ~1864 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 56 |
| Marital Status | Married |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | Farmer |
| Industry | General Farm |
| Class of Worker | OA |
| 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
Hamilton, Illinois
Head, age 65
Hamilton, Illinois · implied b. ~1865 — 5 household members
| Surname | McMahon |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 65 |
| Marital Status | Married |
| Birthplace | Illinois |
| Age at First Marriage | 23 |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | Farmer |
| Industry | General Farm |
| Class of Worker | O |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Hamilton-County, Illinois
Head, age 75
Hamilton-County, Illinois · implied b. ~1865 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahan |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 75 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Mayberry Township |
| 1935 Residence (County) | Hamilton |
| Occupation | Farmer |
| Industry | Grain |
| Class of Worker | OA |
| Hours Worked | 50 |
| Income (1939) | 0 |
| Highest Grade | No 2 |
| 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 John Mcmahon across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
John Mcmahon
Head · 1930 · age 65 · b. ~1865 · Illinois
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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 — Hamilton, Illinois
Open full size
1930 US Federal Census — Hamilton, Illinois
Page Contents
50 people indexed on this census page (ia:1930:illinoiscensus00reel514:1066)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Samuel Van Winkle | 32 | Son | Laborer | Illinois |
| 52 | Genevieve Van Winkle | 9 | Daughter | — | Illinois |
| 53 | Charles G. Leah | 46 | Head | Farmer | Illinois |
| 54 | Mary Leah | 39 | Wife-H | — | Illinois |
| 55 | Fred Leah | 17 | Son | Laborer | Illinois |
| 56 | Opal Leah | 15 | Daughter | — | Illinois |
| 57 | Verna E. Leah | 13 | Daughter | — | Illinois |
| 58 | Pearl Leah | 7 | Daughter | — | Illinois |
| 59 | John W. Allen | 42 | Head | Farmer | Illinois |
| 60 | Lizzie Allen | 34 | Wife-H | — | Illinois |
| 61 | Milie Allen | 15 | Son-ab | Laborer | Illinois |
| 62 | Willie Allen | 14 | Son | Laborer | Illinois |
| 63 | Lloyd Allen | 12 | Son | Laborer | Illinois |
| 64 | Roberta Allen | 10 | Daughter | — | Illinois |
| 65 | Osborn Allen | 8 | Son | — | Illinois |
| 66 | Audrey Allen | 5 | Daughter | — | Illinois |
| 67 | John Leah | 38 | Head | Farmer | Illinois |
| 68 | Lilla Leah | 33 | Wife-H | — | Illinois |
| 69 | Glenn E. Leah | 14 | Son | Laborer | Illinois |
| 70 | Walter G. Leah | 13 | Son | Laborer | Illinois |
| 71 | Wilbert G. Leah | 11 | Son | Laborer | Illinois |
| 72 | James Ray | 45 | Head | Farmer | Illinois |
| 73 | Mary Ray | 30 | Wife-H | — | Illinois |
| 74 | Ralph Ray | 12 | Son | Laborer | Illinois |
| 75 | Hazel Ray | 5 | Daughter | — | Illinois |
| 76 | Charles A. Ray | 2 | Son | — | Illinois |
| 77 | Bell Griffith | 56 | Mother-in-law | — | Illinois |
| 78 | Sumner S. Sherley | 51 | Head | Farmer | Illinois |
| 79 | Ollie A. Sherley | 48 | Wife-H | — | Illinois |
| 80 | Harry Sherley | 13 | Son | — | Illinois |
| 81 | Joseph H. Allen | 47 | Head | Farmer | Illinois |
| 82 | Ina Allen | 36 | Wife-H | — | Illinois |
| 83 | Lily M. Allen | 15 | Daughter | — | Illinois |
| 84 | Alice Allen | 13 | Daughter | — | Illinois |
| 85 | John Allen | 10 | Son | — | Illinois |
| 86 | Iona Allen | 9 | Daughter | — | Illinois |
| 87 | Thelma Allen | 5 | Daughter | — | Illinois |
| 88 | Ruby Allen | 3 | Daughter | — | Illinois |
| 89 | John Mcmahon THIS PERSON | 65 | Head | Farmer | Illinois |
| 90 | Alice Mcmahon | 67 | Wife-H | — | Ohio |
| 91 | Frank Mcmahon | 41 | Son | Laborer | Illinois |
| 92 | Ben Mcmahon | 23 | Son | Laborer | Illinois |
| 93 | Alton C. Mcmahon | 21 | Son | Laborer | Illinois |
| 94 | Ben F. Eldredge | 45 | Head | Farmer | Indiana |
| 95 | Madeline Eldredge | 40 | Wife-H | — | Pennsylvania |
| 96 | Gladys Eldredge | 17 | Daughter | — | Illinois |
| 97 | Clara Eldredge | 15 | Daughter | — | Illinois |
| 98 | Albert Eldredge | 12 | Son | — | Illinois |
| 99 | Laura Eldredge | 8 | Daughter | — | Illinois |
| 100 | William Eldredge | 5 | Son | — | Illinois |
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)