JM
James Mason — 1940 US Census Record
Model Tree available1940 United States Federal Census · La-Plata-County, Colorado
Our Model Tree links this James Mason across the 1920, 1930 and 1940 US Censuses in La-Plata-County, Colorado (XGBoost, ~Confirmed), with identified parents John & Jennie — first a son (b.~1907), then head of a 3-person household.
Age 33
b. ~1907
Male
Son
Born: Colorado
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | La-Plata-County, Colorado |
| Surname | Mason |
| Given Name | James D. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 33 |
| Marital Status | Single |
| Birthplace | Colorado |
| 1935 Residence (City) | Election Precinct 16 Pleasant View |
| 1935 Residence (County) | La Plata |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 40 |
| Highest Grade | No 8 |
| 1935 Residence | Same house |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
| Occupation | Farmer |
| Township / Ward | Election Precinct 16 Pleasant View |
| Est. Birth Year | ~1907 |
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 |
|---|---|---|---|---|
| Janet Mason | Head | — | 60 | ~1880 |
| George Mason | Son | — | 39 | ~1901 |
| James Mason | Son | — | 33 | ~1907 |
Census Appearances
1920
La Plata, …
Son, age 14
La Plata, Colorado · implied b. ~1906 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mason |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Colorado |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Illinois |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
1930
La Plata, …
Son, age 25
La Plata, Colorado · implied b. ~1905 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mason |
| Given Name | James D. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Colorado |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Illinois |
| Occupation | Laborer |
| Industry | Farm |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
1940
La-Plata-County, Colorado
Son, age 33
La-Plata-County, Colorado · implied b. ~1907 — 3 household members
| Surname | Mason |
| Given Name | James D. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 33 |
| Marital Status | Single |
| Birthplace | Colorado |
| 1935 Residence (City) | Election Precinct 16 Pleasant View |
| 1935 Residence (County) | La Plata |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 40 |
| Highest Grade | No 8 |
| 1935 Residence | Same house |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
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 Mason across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Mason (~0.92 confidence) and mother Jennie Mason (~0.92 confidence) and mother Janet Mason (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Mason
b. ~1876
Source father
● Household
· direct · ~0.92
Mother
Jennie Mason
b. ~1880
Source mother
● Household
· direct · ~0.92
Mother
Janet Mason
b. ~1880
Source mother
● Household
· direct · ~0.92
This person
Anchor record
James Mason
Son · 1940 · age 33 · b. ~1907 · Colorado
★ You are viewing this record
Sibling
George Mason
Sibling · 1940 · age 39
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
1940 US Federal Census — La-Plata-County, Colorado
Open full size
1940 US Federal Census — La-Plata-County, Colorado
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00466-00980)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Johanna Dunn | 70 | Wife | — | Germany |
| 2 | Thomas Mccosh | 29 | Head | Farmer | Colorado |
| 3 | Leona Mccosh | 24 | Wife | — | Oklahoma |
| 4 | Edward Mccosh | 6 | Son | — | Colorado |
| 5 | Gloria Ellen Mccosh | 5 | Daughter | — | Colorado |
| 6 | John Mccosh | 4 | Son | — | Colorado |
| 7 | Bertha Thompson | 62 | Mother | — | Michigan |
| 8 | James Dennison | 67 | Head | Farmer | Wales |
| 9 | Katherine Dennison | 66 | Wife | — | Ireland |
| 10 | James H. Dennison | 40 | Son | Farmer | Colorado |
| 11 | Clara Dennison | 37 | Daughter-in-law | — | Colorado |
| 12 | Gerald Dennison | 17 | Grand-son | — | Colorado |
| 13 | Phillip Dennison | 15 | Grand-daughter | — | Colorado |
| 14 | Lenore Dennison | 13 | Grand-daughter | — | Colorado |
| 15 | Donald Dennison | 7 | Grand-son | — | Colorado |
| 16 | Leo Dennison | 5 | Grand-son | — | Colorado |
| 17 | Keith Dennison | 2 | Grand-son | — | Colorado |
| 18 | James Mason | 73 | Head | — | Penn. |
| 19 | Janet Mason | 60 | Head | — | Illinois |
| 20 | George Mason | 39 | Son | — | Missouri |
| 21 | James D. Mason THIS PERSON | 33 | Son | Farmer | Colorado |
| 22 | Earl Crawford | 51 | Head | Farmer | Missouri |
| 23 | Allen Crawford | 27 | Son | Farmer | Colorado |
| 24 | Arlene Crawford | 22 | Daughter | — | Oklahoma |
| 25 | Mark Gudmundson | 20 | Hired hand | Farm Labor | Idaho |
| 26 | Garfield Davies | 55 | Head | Farmer | Wales |
| 27 | Cecil Davies | 51 | Wife | — | Nebraska |
| 28 | Victor Paulek | 50 | Head | Farmer | Lithuania |
| 29 | Albert Paulek | 21 | Son | Farm Labor | Colorado |
| 30 | John Paulek | 18 | Son | Farm Labor | Colorado |
| 31 | Edward Paulek | 11 | Son | — | Colorado |
| 32 | Benny Rabbit | 75 | Head | Farmer | Colorado |
| 33 | Mrs. Benny Rabbit | 70 | Wife | — | Colorado |
| 34 | Victor M. Paulek | 34 | Head | Farmer | Colorado |
| 35 | Marguerite Paulek | 36 | Wife | — | Colorado |
| 36 | Grant Paulek | 10 | Son | — | Colorado |
| 37 | Marilyn Paulek | 5 | Daughter | — | Colorado |
| 38 | Raymond Kennedy | 39 | Hired hand | Farm Labor | Ohio |
| 39 | Duke H. Paulek | 32 | Head | Farmer | Colorado |
| 40 | Alice Paulek | 27 | Wife | — | Colorado |
Pedigree Summary
James + 1 sibling
Gen 1 · 3 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)