RM
Robert Mason — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Baltimore-City-County, Maryland
Our Model Tree links this Robert Mason across the 1930 and 1940 US Censuses in Baltimore-City-County, Maryland (XGBoost, ~Confirmed) — first a son (b.~1927), then head of a 8-person household.
Age 13
b. ~1927
Male
Son
Born: Maryland
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Baltimore-City-County, Maryland |
| Surname | Mason |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| Additional Details | |
| Highest Grade | Yes 6 |
| 1935 Residence | Same Place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Baltimore City |
| Est. Birth Year | ~1927 |
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 |
|---|---|---|---|---|
| James Mason | Head | — | 53 | ~1887 |
| James Mason | Son | — | 8 | ~1932 |
| Melvin Mason | Son | — | 10 | ~1930 |
| Leon Mason | Son | — | 16 | ~1924 |
| Steven Mason | Son | — | 14 | ~1926 |
| Charles Mason | Son | — | 12 | ~1928 |
| Robert Mason | Son | — | 13 | ~1927 |
| Daisy Mason | Spouse | — | 34 | ~1906 |
Census Appearances
1930
Baltimore, Maryland
Son, age 3
Baltimore, Maryland · implied b. ~1927 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mason |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Baltimore-City-County, Maryland
Son, age 13
Baltimore-City-County, Maryland · implied b. ~1927 — 8 household members
| Surname | Mason |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| Highest Grade | Yes 6 |
| 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 13 · b. ~1927 · Maryland
★ You are viewing this record
Sibling
Steven Mason
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Leon Mason
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Charles Mason
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Mason
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Melvin Mason
Sibling · 1940 · age 10
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 — Baltimore-City-County, Maryland
Open full size
1940 US Federal Census — Baltimore-City-County, Maryland
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01534-00788)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Alice Hightower | 19 | Wife | — | Maryland |
| 2 | James T Hightower | 21 | Head | Laborer | Virginia |
| 3 | Wilson Bynon | 21 | Brother-in-law | Laborer | Maryland |
| 4 | Josephine Wright | 57 | Head | Keeper | Maryland |
| 5 | Ernest Wright | 28 | Son | Stevedore | Maryland |
| 6 | Elvena Wright | 28 | Daughter | Painter | Maryland |
| 7 | Ivory Love | 13 | Lodger | — | Maryland |
| 8 | Josephine Love | 12 | Lodger | — | Maryland |
| 9 | Samuel Love | 11 | Lodger | — | Maryland |
| 10 | James Love | 10 | Lodger | — | Maryland |
| 11 | Mary Love | 9 | Lodger | — | Maryland |
| 12 | Ella Lee | 59 | Head | — | Virginia |
| 13 | Bertha Brown | 29 | Head | — | South Carolina |
| 14 | John Brown | 13 | Son | — | South Carolina |
| 15 | Theadore Brown | 12 | Son | — | South Carolina |
| 16 | George Moore | 39 | Head | Stevedore | Maryland |
| 17 | Lillian E Moore | 34 | Wife | — | Maryland |
| 18 | Charles Moore | 18 | Son | New Worker | Maryland |
| 19 | Bernard Moore | 17 | Son | — | Maryland |
| 20 | Marie Moore | 16 | Daughter | — | Maryland |
| 21 | George Jr Moore | 15 | Son | — | Maryland |
| 22 | Delma Moore | 12 | Daughter | — | Maryland |
| 23 | Doris Moore | 11 | Daughter | — | Maryland |
| 24 | Jerome Moore | 9 | Son | — | Maryland |
| 25 | Stanley Moore | 8 | Son | — | Maryland |
| 26 | Elmer Moore | 7 | Son | — | Maryland |
| 27 | Gwendolyn Moore | 3 | Daughter | — | Maryland |
| 28 | Payton Johnson | 47 | Head | Laborer | Maryland |
| 29 | Bertha Johnson | 48 | Wife | Housework | Maryland |
| 30 | Dolores Johnson | 13 | Daughter | — | Maryland |
| 31 | Catherine Johnson | 12 | Daughter | — | Maryland |
| 32 | Henrietta Taylor | 36 | Uncle | Laborer | Maryland |
| 33 | James Mason | 53 | Head | Wpa Laborer | Virginia |
| 34 | Daisy Mason | 34 | Wife | — | Virginia |
| 35 | Leon Mason | 16 | Son | — | Maryland |
| 36 | Steven Mason | 14 | Son | — | Pennsylvania |
| 37 | Robert Mason THIS PERSON | 13 | Son | — | Maryland |
| 38 | Charles Mason | 12 | Son | — | Maryland |
| 39 | Melvin Mason | 10 | Son | — | Maryland |
| 40 | James Mason | 8 | Son | — | Maryland |
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)