MC
Mary Chase — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Charles-County, Maryland
Our Model Tree links this Mary Chase across the 1930 and 1940 US Censuses in Charles-County, Maryland (XGBoost, ~Confirmed) — first a daughter (b.~1925), then head of a 11-person household.
Age 15
b. ~1925
Female
Daughter
Born: Maryland
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Charles-County, Maryland |
| Surname | Chase |
| Given Name | Mary J. |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | Black |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Election District 8 |
| 1935 Residence (County) | Charles |
| Additional Details | |
| Industry | H 5 |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Election District 8 |
| Est. Birth Year | ~1925 |
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.
11 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| William Chase | Son | — | 2 | ~1938 |
| Dorothy Chase | Daughter | — | 16 | ~1924 |
| Frances Chase | Other | — | 3 | ~1937 |
| Dorothy Chase | Head | — | 35 | ~1905 |
| Thomas Chase | Son | — | 11 | ~1929 |
| William Stewart | Other | — | 39 | ~1901 |
| Virginia Chase | Daughter | — | 8 | ~1932 |
| Catherine Chase | Daughter | — | 10 | ~1930 |
| Mary Chase | Daughter | — | 20 | ~1920 |
| Emily Chase | Daughter | — | 5 | ~1935 |
| Mary Chase | Daughter | — | 15 | ~1925 |
Census Appearances
1930
Charles, Maryland
Daughter, age 4
Charles, Maryland · implied b. ~1926 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Chase |
| Given Name | Mary F |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Charles-County, Maryland
Daughter, age 15
Charles-County, Maryland · implied b. ~1925 — 11 household members
| Surname | Chase |
| Given Name | Mary J. |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | Black |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Election District 8 |
| 1935 Residence (County) | Charles |
| Industry | H 5 |
| Highest Grade | No 7 |
| 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 Mary Chase across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Chase
Daughter · 1940 · age 15 · b. ~1925 · Maryland
★ You are viewing this record
Sibling
Emily Chase
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Chase
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Chase
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Virginia Chase
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Chase
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Chase
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dorothy Chase
Sibling · 1940 · age 16
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 — Charles-County, Maryland
Open full size
1940 US Federal Census — Charles-County, Maryland
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01546-00224)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Bessie L. Lybrook | 26 | wife | — | Maryland |
| 2 | Varrow E. Robey | 60 | Head | Carpenter Helper | Maryland |
| 3 | William A. Robey | 38 | Son | Truck Driver | Maryland |
| 4 | Alice E. Robey | 33 | wife | — | Maryland |
| 5 | James J. Mckay | 69 | lodger | Carpenter | Maryland |
| 6 | Emma Mckay | 60 | lodger | — | Pennsylvania |
| 7 | Margie Jacobs | 38 | lodger | Operator | Maryland |
| 8 | John Higgins | 18 | Head | Farm Hand | Maryland |
| 9 | Samuel Bruere | 28 | Head | Mechanic | Maryland |
| 10 | Gladys Bruere | 27 | wife | — | Maryland |
| 11 | Earl Bruere | 8 | son | — | Maryland |
| 12 | Harriet Pinkard | 64 | Head | Laundress | Maryland |
| 13 | John Edward Pinkard | 24 | son | Tobacco Packer | Maryland |
| 14 | Peter C. Booge | 59 | Head | — | Maryland |
| 15 | Catherine Booge | 54 | wife | — | Maryland |
| 16 | Alice Dent | 33 | daughter | — | Maryland |
| 17 | Thomas Dent | 13 | son | — | Maryland |
| 18 | James Dent | 12 | son | — | Maryland |
| 19 | Edward Dent | 7 | son | — | Maryland |
| 20 | Eugene Dent | 7 | son | — | Maryland |
| 21 | John Dent | 6 | son | — | Maryland |
| 22 | Wallace Dent | 3 | son | — | Maryland |
| 23 | Edward A. Booge | 29 | son | Janitor | Maryland |
| 24 | Mary E. Booge | 22 | daughter in law | — | Maryland |
| 25 | Mary G. Booge | 6 | daughter | — | Maryland |
| 26 | Dorothy J. Chase | 35 | Head | Wash Woman | Maryland |
| 27 | Mary Agnes Chase | 20 | daughter | Maid | Maryland |
| 28 | Dorothy L. Chase | 16 | daughter | — | Maryland |
| 29 | Mary J. Chase THIS PERSON | 15 | daughter | — | Maryland |
| 30 | Thomas J. Chase | 11 | son | — | Maryland |
| 31 | Catherine C. Chase | 10 | daughter | — | Maryland |
| 32 | Virginia E. Chase | 8 | daughter | — | Maryland |
| 33 | Emily L. Chase | 5 | daughter | — | Maryland |
| 34 | William A. Chase | 2 | son | — | Maryland |
| 35 | Frances L. Chase | 3 | Grand daughter | — | Maryland |
| 36 | William A. Stewart | 39 | Boarder | Laborer | Maryland |
| 37 | Bernard J. Marshall | 42 | Head | Farm Laborer | Maryland |
| 38 | Annie E. Marshall | 40 | wife | Maid | Maryland |
| 39 | Hazel B. Marshall | 18 | daughter | Maid | Maryland |
| 40 | James E. Marshall | 12 | 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)