RM
Robert Mason — 1940 US Census Record
Model Tree available1940 United States Federal Census · Plymouth-County, Massachusetts
Our Model Tree links this Robert Mason across the 1920, 1930 and 1940 US Censuses in Plymouth-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Mabel & Myrtle — first a son (b.~1919), then head of a 5-person household.
Age 21
b. ~1919
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Plymouth-County, Massachusetts |
| Surname | Mason |
| Given Name | Robert L. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Brockton City |
| 1935 Residence (County) | Plymouth |
| Additional Details | |
| Occupation | Laborer |
| Industry | C.C.C. |
| Class of Worker | GW |
| Hours Worked | 48 |
| Income (1939) | 988 |
| Highest Grade | H 2 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Laborer |
| Township / Ward | Brockton City |
| Est. Birth Year | ~1919 |
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 1940 census.
| Name | Relation to head | Relative to Robert | Age | Birth yr |
|---|---|---|---|---|
| Beverly Mason | Daughter | — | 10 | ~1930 |
| Myrtle Mason | Head | — | 52 | ~1888 |
| Harry Crocker | Other | — | 33 | ~1907 |
| Robert Mason | Son | — | 21 | ~1919 |
| Ralph Mason | Son | — | 22 | ~1918 |
Census Appearances
1920
Plymouth, Massachusetts
Son, age 1
Plymouth, Massachusetts · implied b. ~1919 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mason |
| Given Name | Robert S. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Plymouth, Massachusetts
Son, age 11
Plymouth, Massachusetts · implied b. ~1919 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mason |
| Given Name | Robert L. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Plymouth-County, Massachusetts
Son, age 21
Plymouth-County, Massachusetts · implied b. ~1919 — 5 household members
| Surname | Mason |
| Given Name | Robert L. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Brockton City |
| 1935 Residence (County) | Plymouth |
| Occupation | Laborer |
| Industry | C.C.C. |
| Class of Worker | GW |
| Hours Worked | 48 |
| Income (1939) | 988 |
| Highest Grade | H 2 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
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 Robert Mason across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Mabel Mason (~0.92 confidence) and mother Myrtle Mason (~0.92 confidence) and father Ralph Mason (~0.92 confidence) and father Ralph Mason (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Mabel Mason
b. ~1889
Source mother
● Household
· direct · ~0.92
Mother
Myrtle Mason
b. ~1889
Source mother
● Household
· direct · ~0.92
Father
Ralph Mason
b. ~1892
Source father
● Household
· direct · ~0.92
Father
Ralph Mason
b. ~1896
Source father
● Household
· direct · ~0.92
This person
Anchor record
Robert Mason
Son · 1940 · age 21 · b. ~1919 · Massachusetts
★ You are viewing this record
Sibling
Beverly Mason
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ralph Mason
Sibling · 1940 · age 22
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 — Plymouth-County, Massachusetts
Open full size
1940 US Federal Census — Plymouth-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01636-00027)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Alma J. Peckman | 16 | Daughter | Housekeeper | Massachusetts |
| 42 | Ellen J. Peckman | 13 | Daughter | — | Massachusetts |
| 43 | Alberta M. Peckman | 12 | Daughter | — | Massachusetts |
| 44 | Simon C. Johnson | 21 | Roomer | Boiler Room | Massachusetts |
| 45 | James T. Meadi | 52 | Head | Foreman | Massachusetts |
| 46 | Margaret M. Meadi | 53 | Wife | — | Massachusetts |
| 47 | Margaret M. Meadi | 23 | Daughter | New Worker | Massachusetts |
| 48 | Rose E. Meadi | 21 | Daughter | New Worker | Massachusetts |
| 49 | Myrtle M. Mason | 52 | Head | — | Massachusetts |
| 50 | Ralph B. Mason | 22 | Son | Clerk Sales | Massachusetts |
| 51 | Robert L. Mason THIS PERSON | 21 | Son | Laborer | Massachusetts |
| 52 | Beverly J. Mason | 10 | Daughter | — | Massachusetts |
| 53 | Harry G. Crocker | 33 | Roomer | Foreman | New York |
| 54 | Anbis J. Dilly | 68 | Head | Foreman | Bermuda |
| 55 | Ephah H. Dilly | 63 | Wife | — | Bermuda |
| 56 | Leo H. Fortier | 38 | Head | Owner | Massachusetts |
| 57 | Rose A. Fortier | 39 | Wife | — | Massachusetts |
| 58 | June R. Fortier | 4 | Daughter | — | Massachusetts |
| 59 | Paul L. Fortier | 3 | Son | — | Massachusetts |
| 60 | Clifford G. Broman | 26 | Head | Salesman | Massachusetts |
| 61 | Ruth M. Broman | 19 | Wife | — | Massachusetts |
| 62 | Lorraine Broman | 0 | Daughter | — | Massachusetts |
| 63 | Alton D. Bell | 29 | Head | Sales Clerk | Maine |
| 64 | Pauline L. Bell | 24 | Wife | Waitress | Maine |
| 65 | Ernest A. Ducharme | 32 | Head | Laborer | Massachusetts |
| 66 | Anna M. Ducharme | 33 | Wife | — | Massachusetts |
| 67 | Pauline Ducharme | 6 | Daughter | — | Massachusetts |
| 68 | Donald F. Ducharme | 5 | Son | — | Massachusetts |
| 69 | Claire L. Ducharme | 2 | Daughter | — | Massachusetts |
| 70 | Allan E. Morse | 22 | Head | Truck Driver | Massachusetts |
| 71 | Hazel M. Morse | 20 | Wife | — | Massachusetts |
| 72 | Joan B. Morse | 0 | Daughter | — | Massachusetts |
| 73 | Elizabeth W. Holmes | 76 | Head | — | Massachusetts |
| 74 | Arthur H. Holmes | 46 | Son | Truck Driver | Massachusetts |
| 75 | Ellsworth W. Brainard | 53 | Head | Shoe Worker | Massachusetts |
| 76 | Ruth Brainard | 46 | Wife | — | Massachusetts |
| 77 | Ethel M. Mosher | 25 | Daughter | Ironer | Massachusetts |
| 78 | Alice Brainard | 24 | Daughter | Shoe Worker | Massachusetts |
| 79 | Constance L. Mosher | 8 | Granddaughter | — | Massachusetts |
| 80 | Arthur T. Mosher | 5 | Grandson | — | Massachusetts |
Pedigree Summary
Robert + 2 siblings
Gen 1 · 4 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)