JM
James Mcmahon — 1940 US Census Record
Model Tree available1940 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), with identified parents B — first a head (b.~1904), then head of a 6-person household.
Age 36
b. ~1904
Male
Head
Born: South Carolina
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Richland-County, South Carolina |
| Surname | McMahon |
| Given Name | James R. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 36 |
| Marital Status | Married |
| Birthplace | South Carolina |
| 1935 Residence (City) | Columbia City |
| 1935 Residence (County) | Richland |
| Additional Details | |
| Occupation | Truck Driver |
| Industry | Scales Company |
| Class of Worker | PW |
| Hours Worked | 58 |
| Income (1939) | 910 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same house |
| Birth State | South Carolina |
| Birth Country | United States |
| Birthplace (normalized) | south carolina |
| Occupation | Truck Driver |
| Township / Ward | Columbia City |
| Est. Birth Year | ~1904 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| Mary Mcmahon | Daughter | — | 5 | ~1935 |
| Betty Mcmahon | Daughter | — | 13 | ~1927 |
| Sybil Mcmahon | Daughter | — | 10 | ~1930 |
| James Mcmahon | Head | — | 36 | ~1904 |
| Lester Ashford | Other | — | 59 | ~1881 |
| Ruby Mcmahon | Spouse | — | 34 | ~1906 |
Census Appearances
1920
Richland, South …
Other, age 16
Richland, South Carolina · implied b. ~1904 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | James S. |
| Relationship to Head | Nephew |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | South Carolina |
| Father's Birthplace | South Carolina |
| Mother's Birthplace | South Carolina |
| Occupation | Salesman |
| Industry | Soft Drink Co. |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | South Carolina |
| Birth Country | United States |
| Birthplace (normalized) | south carolina |
1930
Richland, South …
Son, age 26
Richland, South Carolina · implied b. ~1904 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Married |
| Birthplace | South Carolina |
| Age at First Marriage | 22 |
| Father's Birthplace | South Carolina |
| Mother's Birthplace | South Carolina |
| Occupation | Day man |
| Industry | Railroad |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | South Carolina |
| Birth Country | United States |
| Birthplace (normalized) | south carolina |
1940
Richland-County, South …
Head, age 36
Richland-County, South Carolina · implied b. ~1904 — 6 household members
| Surname | McMahon |
| Given Name | James R. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 36 |
| Marital Status | Married |
| Birthplace | South Carolina |
| 1935 Residence (City) | Columbia City |
| 1935 Residence (County) | Richland |
| Occupation | Truck Driver |
| Industry | Scales Company |
| Class of Worker | PW |
| Hours Worked | 58 |
| Income (1939) | 910 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same house |
| Birth State | South Carolina |
| Birth Country | United States |
| Birthplace (normalized) | south carolina |
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. Identified parents: father B Mcmahon (~0.92 confidence). The pedigree spans 1 generation with 1 identified ancestor.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
B Mcmahon
b. ~1881
Source father
● Household
· direct · ~0.92
This person
Anchor record
James Mcmahon
Head · 1940 · age 36 · b. ~1904 · South Carolina
★ You are viewing this record
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-t0627-03833-00102)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Cless J. Cole | 34 | Head | Tying Machine | South Carolina |
| 2 | Relia Cole | 37 | Wife | — | South Carolina |
| 3 | Elmer Hall | 18 | Daughter | Domestic | South Carolina |
| 4 | Morrison Cole | 12 | Son | — | South Carolina |
| 5 | Gerald Cole | 5 | Son | — | South Carolina |
| 6 | """C. R.""" Mccaw | 25 | Head | Loom Fixer | Georgia |
| 7 | Addie Mccaw | 29 | Wife | — | South Carolina |
| 8 | George Mccaw | 2 | Son | — | South Carolina |
| 9 | John T. Mccaw | 23 | Head | Nightwatchman | Georgia |
| 10 | Lanere Mccaw | 19 | Wife | — | Georgia |
| 11 | Lanette Mccaw | 0 | Daughter | — | Georgia |
| 12 | A. Haskell Moak | 40 | Head | Weaver | South Carolina |
| 13 | Maude Moak | 38 | Wife | — | Tennessee |
| 14 | Kathleen Moak | 14 | Daughter | — | South Carolina |
| 15 | Billy Moak | 11 | Son | — | South Carolina |
| 16 | Harold Moak | 9 | Son | — | South Carolina |
| 17 | Ida Cooper | 56 | Head | — | South Carolina |
| 18 | """A. Y.""" Cooper | 18 | Son | General Helper | South Carolina |
| 19 | Ray Cooper | 15 | Son | — | South Carolina |
| 20 | Vernelle Cooper | 15 | Daughter | — | South Carolina |
| 21 | Everette Reese | 24 | Son-in-law | Duck Mill | South Carolina |
| 22 | Bailey Fraher | 60 | Head | — | Georgia |
| 23 | Gladys Fraher | 21 | Son | Laborer | Georgia |
| 24 | Quincy Martin | 28 | Head | Oiling | South Carolina |
| 25 | Henrietta Martin | 24 | Wife | Cleaning | Georgia |
| 26 | Ronald Martin | 7 | Son | — | South Carolina |
| 27 | Margie Martin | 4 | Daughter | — | South Carolina |
| 28 | June Martin | 1 | Daughter | — | South Carolina |
| 29 | Sam Nicks | 67 | Lodger | — | Georgia |
| 30 | James R. Mcmahon THIS PERSON | 36 | Head | Truck Driver | South Carolina |
| 31 | Ruby Mcmahon | 34 | Wife | Card Room | South Carolina |
| 32 | Betty Mcmahon | 13 | Daughter | — | South Carolina |
| 33 | Sybil Mcmahon | 10 | Daughter | — | South Carolina |
| 34 | Mary Ann Mcmahon | 5 | Daughter | — | South Carolina |
| 35 | Lester B. Ashford | 59 | Son-in-law | Card Room | South Carolina |
| 36 | Mamie Stanley | 53 | Head | Fill Batteries | Tennessee |
| 37 | Travis Parritt | 32 | Son-in-law | Fill Batteries | South Carolina |
| 38 | Juanita Parritt | 28 | Daughter | Fill Batteries | South Carolina |
| 39 | Jacqueline Parritt | 4 | Granddaughter | — | South Carolina |
| 40 | Hattie Workman | 54 | Head | Sewing Room | Georgia |
Pedigree Summary
James
Gen 1 · 1 parents
~0.92
Max depth 4 (1900–1950 window)
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)