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John Mcmahon — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Knox, Tennessee
Our Model Tree links this John Mcmahon across the 1930 and 1940 US Censuses in Knox, Tennessee (XGBoost, ~Confirmed) — first a son (b.~1915), then head of a 9-person household.
Age 15
b. ~1915
Male
Son
Born: Tennessee
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Knox, Tennessee |
| Surname | McMahon |
| Given Name | John S. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Tennessee |
| Father's Birthplace | Tennessee |
| Mother's Birthplace | Alabama |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | Tennessee |
| Birth Country | United States |
| Birthplace (normalized) | tennessee |
| Township / Ward | City Knoxville |
| Est. Birth Year | ~1915 |
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.
9 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Celest Mcmahon | Daughter | — | 13 | ~1917 |
| Lovenda Mcmahon | Daughter | — | 7 | ~1923 |
| Ana Mcmahon | Daughter | — | 15 | ~1915 |
| Sam Mcmahon | Head | — | 51 | ~1879 |
| Hugh Mcmahon | Son | — | 8 | ~1922 |
| John Mcmahon | Son | — | 15 | ~1915 |
| Cleo Mcmahon | Son | — | 10 | ~1920 |
| Paris Mcmahon | Son | — | 19 | ~1911 |
| Lessie Mcmahon | Spouse | — | 44 | ~1886 |
Census Appearances
1930
Knox, Tennessee
Son, age 15
Knox, Tennessee · implied b. ~1915 — 9 household members
| Surname | McMahon |
| Given Name | John S. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Tennessee |
| Father's Birthplace | Tennessee |
| Mother's Birthplace | Alabama |
| Can Read/Write | Yes |
| Birth State | Tennessee |
| Birth Country | United States |
| Birthplace (normalized) | tennessee |
1940
Knox-County, Tennessee
Son, age 22
Knox-County, Tennessee · implied b. ~1918 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahan |
| Given Name | John P |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Tennessee |
| 1935 Residence (City) | Civil District 15 |
| 1935 Residence (County) | Knox |
| Occupation | Repair Mech. |
| Industry | Cotton Mill |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 280 |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth State | Tennessee |
| Birth Country | United States |
| Birthplace (normalized) | tennessee |
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 15 · b. ~1915 · Tennessee
★ You are viewing this record
Sibling
Celest Mcmahon
Sibling · 1930 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Cleo Mcmahon
Sibling · 1930 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ana Mcmahon
Sibling · 1930 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Hugh Mcmahon
Sibling · 1930 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lovenda Mcmahon
Sibling · 1930 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Paris Mcmahon
Sibling · 1930 · age 19
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 — Knox, Tennessee
Open full size
1930 US Federal Census — Knox, Tennessee
Page Contents
50 people indexed on this census page (ia:1930:15thcensus2259unit:0229)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Ella King | 17 | Daughter | Nurse | Georgia |
| 2 | Georgia M. King | 16 | Daughter | Maid | Georgia |
| 3 | Addie P. King | 14 | Daughter | — | Georgia |
| 4 | Minnie Jr. Porter | 61 | Wife | Teacher | Georgia |
| 5 | Edna A. Porter | 23 | Daughter | — | Tennessee |
| 6 | Ruth Porter | 24 | Daughter | — | Alabama |
| 7 | Anne J. Porter | 22 | Daughter | — | Alabama |
| 8 | Bertha M. Porter | 20 | Daughter | — | Alabama |
| 9 | Sarah E. Magoun | 17 | Roomer | — | Kentucky |
| 10 | Sonia I. Cooper | 21 | Roomer | — | Alabama |
| 11 | Hazel M. Cooper | 17 | Roomer | — | Alabama |
| 12 | Mary E. Smith | 23 | Roomer | — | Arkansas |
| 13 | Frank L. Davis | 46 | Head | Brick Mason | South Carolina |
| 14 | Ellen C. Davis | 43 | Wife | Cook | Tennessee |
| 15 | Frank M. Scales | 43 | Head | Porter | North Carolina |
| 16 | Bula A. Scales | 41 | Wife | Steward | Tennessee |
| 17 | William C. Scales | 21 | Son | — | Tennessee |
| 18 | Arthur Jr. Gordon | 35 | Head | Bell Hop | Tennessee |
| 19 | Christine N. Gordon | 14 | Daughter | — | Tennessee |
| 20 | Jacqueline A. Gordon | 12 | Daughter | — | Tennessee |
| 21 | Maggie Harden | 65 | Mother-in-law | — | Tennessee |
| 22 | Archie C. Harden | 18 | Roomer | — | Tennessee |
| 23 | Sam P. Mcmahon | 51 | Head | Brick Mason | Tennessee |
| 24 | Lessie L. Mcmahon | 44 | Wife | — | Alabama |
| 25 | Paris A. Mcmahon | 19 | Son | — | Tennessee |
| 26 | John S. Mcmahon THIS PERSON | 15 | Son | — | Tennessee |
| 27 | Cleo B. Mcmahon | 10 | Son | — | Tennessee |
| 28 | Hugh B. Mcmahon | 8 | Son | — | Tennessee |
| 29 | Celest Mcmahon | 13 | Daughter | — | Tennessee |
| 30 | Lovenda Mcmahon | 7 | Daughter | — | Tennessee |
| 31 | Ana M. Mcmahon | 15 | Daughter | — | Tennessee |
| 32 | Howard P. Brown | 43 | Head | Heater | Tennessee |
| 33 | Bessie Brown | 43 | Wife | — | Mississippi |
| 34 | Vera C. Brown | 12 | Daughter | — | Tennessee |
| 35 | Ellen M. Brown | 10 | Daughter | — | Tennessee |
| 36 | James P. James | 52 | Head | Labor | Georgia |
| 37 | Nancy James | 50 | Wife | — | Georgia |
| 38 | William H. James | 19 | Son | Labor | Georgia |
| 39 | James P. Hill | 28 | Roomer | Labor | Georgia |
| 40 | Lizzie H. Hill | 23 | Roomer | — | Georgia |
| 41 | Alvin W. Sherrill | 30 | Head | Labor | North Carolina |
| 42 | Ruth E. Sherrill | 30 | Wife | Nurse | Arkansas |
| 43 | Eugene Sherrill | 18 | Son | Porter | North Carolina |
| 44 | Mildred Lane | 11 | Boarder | — | Tennessee |
| 45 | Luther A. Crombie | 28 | Boarder | Nurse | Georgia |
| 46 | Bula G. Crombie | 18 | Boarder | — | Georgia |
| 47 | Joe A. Fritz | 55 | Head | Polisher | Tennessee |
| 48 | Ida Fritz | 55 | Wife | — | Tennessee |
| 49 | Joe Jr. Fritz | 22 | Son | Boiler Maker | Tennessee |
| 50 | Lula Fritz | 18 | Daughter | — | Tennessee |
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)