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James Mcmahon — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Richland-County, South Carolina
Our Model Tree links this James Mcmahon across the 1920, 1930 and 1940 US Censuses in Richland-County, South Carolina (XGBoost, ~Confirmed) — first a head (b.~1878), then head of a 3-person household.
Age 62
b. ~1878
Male
Head
Born: Georgia
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Richland-County, South Carolina |
| Surname | McMahon |
| Given Name | James S. (X) |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 62 |
| Marital Status | Married |
| Birthplace | Georgia |
| 1935 Residence (City) | Columbia City |
| 1935 Residence (County) | Richland |
| Additional Details | |
| Occupation | Nightwatchman |
| Industry | Cotton Warehouse |
| Class of Worker | PW |
| Hours Worked | 49 |
| Income (1939) | 832 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Georgia |
| Birth Country | United States |
| Birthplace (normalized) | georgia |
| Occupation | Nightwatchman |
| Township / Ward | Columbia City |
| Est. Birth Year | ~1878 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| James Mcmahon | Head | — | 62 | ~1878 |
| Paul Mcmahon | Son | — | 19 | ~1921 |
| Minnie Mcmahon | Spouse | — | 59 | ~1881 |
Census Appearances
1920
Richland, South …
Head, age 41
Richland, South Carolina · implied b. ~1879 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | James S. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 41 |
| Marital Status | Married |
| Birthplace | Georgia |
| Father's Birthplace | Georgia |
| Mother's Birthplace | Georgia |
| Occupation | Manager |
| Industry | Soft Drink Co. |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | R |
| Birth State | Georgia |
| Birth Country | United States |
| Birthplace (normalized) | georgia |
1930
Richland, South …
Head, age 51
Richland, South Carolina · implied b. ~1879 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | James S. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 51 |
| Marital Status | Married |
| Birthplace | Georgia |
| Age at First Marriage | 23 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Chauffeur |
| Industry | Bus Company |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 20 |
| Birth State | Georgia |
| Birth Country | United States |
| Birthplace (normalized) | georgia |
1940
Richland-County, South …
Head, age 62
Richland-County, South Carolina · implied b. ~1878 — 3 household members
| Surname | McMahon |
| Given Name | James S. (X) |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 62 |
| Marital Status | Married |
| Birthplace | Georgia |
| 1935 Residence (City) | Columbia City |
| 1935 Residence (County) | Richland |
| Occupation | Nightwatchman |
| Industry | Cotton Warehouse |
| Class of Worker | PW |
| Hours Worked | 49 |
| Income (1939) | 832 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Georgia |
| Birth Country | United States |
| Birthplace (normalized) | georgia |
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 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
James Mcmahon
Head · 1940 · age 62 · b. ~1878 · South Carolina
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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 — Richland-County, South Carolina
Open full size
1940 US Federal Census — Richland-County, South Carolina
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03833-00097)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Iray Cook | 25 | Head | Drawing Room | South Carolina |
| 42 | Grace Cook | 23 | Wife | Spinning Room | South Carolina |
| 43 | Henry Miles | 30 | Brother-in-law | Laborer | South Carolina |
| 44 | Herman (X) Kinsey | 36 | Head | Spinning | South Carolina |
| 45 | Lottie Kinsey | 34 | Wife | Spinning | Florida |
| 46 | Evelyn Kinsey | 2 | Daughter | — | South Carolina |
| 47 | Freddie Cantrell | 28 | Sister-in-law | — | Georgia |
| 48 | Stephen James | 11 | Nephew | — | Georgia |
| 49 | Clyde Hurt | 25 | Head | Salesman | South Carolina |
| 50 | Letha (X) Hurt | 21 | Wife | Spool Room | Georgia |
| 51 | Albert Mead | 63 | Father-in-law | — | Georgia |
| 52 | James Whittle | 23 | Head | Manager | South Carolina |
| 53 | Tiny (X) Whittle | 26 | Wife | — | South Carolina |
| 54 | Mary Lee Whittle | 2 | Daughter | — | South Carolina |
| 55 | George Partridge | 31 | Head | Rune Frames | Alabama |
| 56 | Daisy (X) Partridge | 25 | Wife | — | South Carolina |
| 57 | Betty Grace Partridge | 1 | Daughter | — | South Carolina |
| 58 | Pearl (X) Jones | 32 | Head | Spinning Room | South Carolina |
| 59 | Ray Jones | 11 | Son | — | South Carolina |
| 60 | Henry L. Harris | 48 | Head | Conductor | South Carolina |
| 61 | Ida (X) Harris | 48 | Wife | — | South Carolina |
| 62 | William J. Harris | 11 | Son | — | South Carolina |
| 63 | Henry Kirkland | 37 | Head | Electrician | Georgia |
| 64 | Cola Kirkland | 31 | Wife | Amuse Worker | South Carolina |
| 65 | Minnie Tarlton | 52 | Mother-in-law | — | South Carolina |
| 66 | James S. (X) Mcmahon THIS PERSON | 62 | Head | Nightwatchman | Georgia |
| 67 | Minnie Mcmahon | 59 | Wife | — | South Carolina |
| 68 | Paul Mcmahon | 19 | Son | — | South Carolina |
| 69 | William T. Mcmahon | 23 | Head | Delivery Clerk | South Carolina |
| 70 | Janima Mcmahon | 22 | Wife | Beautician | South Carolina |
| 71 | Robert Mcmahon | 2 | Son | — | South Carolina |
| 72 | James R. (X) Kluke | 60 | Head | Switchman | Alabama |
| 73 | Gula Mae Kluke | 60 | Wife | — | South Carolina |
| 74 | Robert (X) Kluke | 32 | Son | Postal Department | Georgia |
| 75 | Byron Morton | 44 | Step-son | Sheet Metal Worker | North Carolina |
| 76 | Doline Holcombe | 57 | Head | Textile Mechanic | South Carolina |
| 77 | Katy (X) Holcombe | 53 | Wife | — | South Carolina |
| 78 | Catherine Holcombe | 20 | Daughter | Clerical Worker | South Carolina |
| 79 | Charles M. Galloway | 49 | Head | Taxi Driver | South Carolina |
| 80 | Mary (X) Galloway | 50 | Wife | — | South Carolina |
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)