RM
Robert Mason — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Anne-Arundel-County, Maryland
Our Model Tree links this Robert Mason across the 1930 and 1940 US Censuses in Anne-Arundel-County, Maryland (XGBoost, ~Confirmed) — first a son (b.~1930), then head of a 8-person household.
Age 10
b. ~1930
Male
Son
Born: Maryland
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Anne-Arundel-County, Maryland |
| Surname | Mason |
| Given Name | Robert E. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Eastport |
| 1935 Residence (County) | Anne Arundel |
| Additional Details | |
| Highest Grade | No 2 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Eastport |
| Est. Birth Year | ~1930 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Robert | Age | Birth yr |
|---|---|---|---|---|
| Betty Mason | Daughter | — | 11 | ~1929 |
| Edward Mason | Head | — | 32 | ~1908 |
| Harvey Mason | Son | — | 7 | ~1933 |
| William Mason | Son | — | 8 | ~1932 |
| Robert Mason | Son | — | 10 | ~1930 |
| Malcolm Mason | Son | — | 5 | ~1935 |
| Sherman Mason | Son | — | 3 | ~1937 |
| Mabel Mason | Spouse | — | 33 | ~1907 |
Census Appearances
1930
Anne Arundel, …
Son, age
Anne Arundel, Maryland · implied b. ~1930 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mason |
| Given Name | Robert E. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Anne-Arundel-County, Maryland
Son, age 10
Anne-Arundel-County, Maryland · implied b. ~1930 — 8 household members
| Surname | Mason |
| Given Name | Robert E. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Eastport |
| 1935 Residence (County) | Anne Arundel |
| Highest Grade | No 2 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
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 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Robert Mason
Son · 1940 · age 10 · b. ~1930 · Maryland
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Sibling
William Mason
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Sherman Mason
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Malcolm Mason
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Harvey Mason
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Betty Mason
Sibling · 1940 · age 11
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 — Anne-Arundel-County, Maryland
Open full size
1940 US Federal Census — Anne-Arundel-County, Maryland
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01501-00454)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Raymond H. Horsfield | 23 | Son | Lineman | Maryland |
| 2 | James R. Welsh | 52 | Head | Lineman | Maryland |
| 3 | Elsie O. Welsh | 53 | Wife | — | Maryland |
| 4 | Howard Welsh | 30 | Son | General Helper | Maryland |
| 5 | Genevieve Welsh | 27 | Daughter-in-law | — | Washington D.C. |
| 6 | John H. Smith | 63 | Head | — | Maryland |
| 7 | Sarah L. Smith | 69 | Wife | — | Maryland |
| 8 | John R. Smith | 45 | Son | Carpenter | Maryland |
| 9 | Harry Smith | 31 | Son | Plumber | Maryland |
| 10 | Lily T. Smith | 28 | Daughter-in-law | — | Maryland |
| 11 | Harry H. Smith | 8 | Grand-son | — | Maryland |
| 12 | Robert H. Smith | 7 | Grand-son | — | Maryland |
| 13 | Charles Ford | 72 | Head | Janitor | Maryland |
| 14 | Mary Ford | 69 | Wife | — | Maryland |
| 15 | Frederick Ford | 36 | Son | Carpenter | Maryland |
| 16 | George V. Shelton | 33 | Son-in-law | Carpenter | Maryland |
| 17 | Myrtle V. Shelton | 33 | Daughter | — | Maryland |
| 18 | Kathryn Shelton | 8 | Grand-daughter | — | Maryland |
| 19 | Marjorie Shelton | 3 | Grand-daughter | — | Maryland |
| 20 | Edward J. Mason | 32 | Head | Partner | Maryland |
| 21 | Mabel L. Mason | 33 | Wife | — | Maryland |
| 22 | Betty G. Mason | 11 | Daughter | — | Maryland |
| 23 | Robert E. Mason THIS PERSON | 10 | Son | — | Maryland |
| 24 | William D. Mason | 8 | Son | — | Maryland |
| 25 | Harvey B. Mason | 7 | Son | — | Maryland |
| 26 | Malcolm R. Mason | 5 | Son | — | Maryland |
| 27 | Sherman C. Mason | 3 | Son | — | Maryland |
| 28 | Joseph Hormwood | 39 | Head | Electrician | Maine |
| 29 | Irene Hormwood | 36 | Wife | — | Russia |
| 30 | Vladimir Ryoff | 17 | Son | — | China |
| 31 | Cora P. Pindell | 80 | Head | — | Mississippi |
| 32 | Edna P. Kearney | 56 | Daughter | — | Maryland |
| 33 | Lillian Knockstedt | 47 | Head | — | Maryland |
| 34 | Marguerite Knockstedt | 25 | Daughter | Cashier | Maryland |
| 35 | Erma Knockstedt | 23 | Daughter | Saleslady | Maryland |
| 36 | Jean Knockstedt | 9 | Daughter | — | Maryland |
| 37 | Nathaniel C. Wilson | 46 | Head | Painter | Maryland |
| 38 | Mary E. Wilson | 46 | Wife | — | Virginia |
| 39 | Louise Wilson | 17 | Daughter | — | Maryland |
| 40 | Joseph Wilson | 13 | Son | — | Maryland |
Related Census Records
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)