DC
Dorothy Cooper — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Montgomery-County, Maryland
Our Model Tree links this Dorothy Cooper across the 1930 and 1940 US Censuses in Montgomery-County, Maryland (XGBoost, ~Confirmed) — first a daughter (b.~1930), then head of a 9-person household.
Age 10
b. ~1930
Female
Daughter
Born: Maryland
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Montgomery-County, Maryland |
| Surname | Cooper |
| Given Name | Dorothy |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Rural |
| 1935 Residence (County) | Montgomery |
| Additional Details | |
| Highest Grade | No 2 |
| 1935 Residence | Same House |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Rural |
| 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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Dorothy | Age | Birth yr |
|---|---|---|---|---|
| Dorothy Cooper | Spouse | — | 23 | ~1917 |
| Dorothy Cooper | Daughter | — | 10 | ~1930 |
| Emory Cooper | Head | — | 30 | ~1910 |
| Irene Cooper | Daughter | — | 8 | ~1932 |
| James Cooper | Son | — | 14 | ~1926 |
| David Cooper | Son | — | 9 | ~1931 |
| Henrietta Cooper | Daughter | — | 4 | ~1936 |
| Emory Cooper | Son | — | 2 | ~1938 |
| Richard Cooper | Son | — | 6 | ~1934 |
Census Appearances
1930
Montgomery, Maryland
Other, age 1
Montgomery, Maryland · implied b. ~1929 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cooper |
| Given Name | Dorothy |
| Relationship to Head | Granddaughter |
| Sex | F |
| Color / Race | Black |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Montgomery-County, Maryland
Daughter, age 10
Montgomery-County, Maryland · implied b. ~1930 — 9 household members
| Surname | Cooper |
| Given Name | Dorothy |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Rural |
| 1935 Residence (County) | Montgomery |
| Highest Grade | No 2 |
| 1935 Residence | Same House |
| 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 Dorothy Cooper across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Dorothy Cooper
Daughter · 1940 · age 10 · b. ~1930 · Maryland
★ You are viewing this record
Sibling
Richard Cooper
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Cooper
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Emory Cooper
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Henrietta Cooper
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Irene Cooper
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
David Cooper
Sibling · 1940 · age 9
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 — Montgomery-County, Maryland
Open full size
1940 US Federal Census — Montgomery-County, Maryland
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01554-00918)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Arabell Mellott | 11 | Daughter | — | Pennsylvania |
| 2 | Edna Mellott | 8 | Daughter | — | Pennsylvania |
| 3 | Emory Cooper | 30 | Head | Farmer | Maryland |
| 4 | Dorothy Cooper | 23 | Wife | Laundress | Maryland |
| 5 | James Cooper | 14 | Son | — | Maryland |
| 6 | Dorothy Cooper THIS PERSON | 10 | Daughter | — | Maryland |
| 7 | David Cooper | 9 | Son | — | Maryland |
| 8 | Irene Cooper | 8 | Daughter | — | Maryland |
| 9 | Richard Cooper | 6 | Son | — | Maryland |
| 10 | Henrietta Cooper | 4 | Daughter | — | Maryland |
| 11 | Emory Jr Cooper | 2 | Son | — | Maryland |
| 12 | Arthur H Doug | 50 | Head | Laborer | Maryland |
| 13 | Louisa W Doug | 50 | Wife | — | Maryland |
| 14 | Arthur Jr Doug | 22 | Step Son | Caddie | Maryland |
| 15 | Milford Doug | 10 | Step Son | — | Maryland |
| 16 | Margaret Doug | 23 | Daughter in Law | — | Maryland |
| 17 | William Doug | 1 | Grandson | — | Maryland |
| 18 | Pauline Lefeged | 24 | Daughter | Gardener | Maryland |
| 19 | Barbara Lefeged | 6 | Granddau | — | Maryland |
| 20 | Betty Lefeged | 4 | Granddau | — | Maryland |
| 21 | Gerrylee Lefeged | 3 | Granddau | — | Maryland |
| 22 | Catherine Doug | 70 | Mother | — | Maryland |
| 23 | Viola Doug | 33 | Daughter | — | Maryland |
| 24 | Harry Johnson | 43 | Grandson | Laborer | Maryland |
| 25 | Le Roy Dove | 32 | Head | — | Maryland |
| 26 | Arlene V Dove | 27 | Wife | — | Maryland |
| 27 | Edward Dove | 9 | Son | — | Maryland |
| 28 | Calvin Dove | 7 | Son | — | Maryland |
| 29 | Leroy Jr Dove | 5 | Son | — | Maryland |
| 30 | William Dove | 4 | Son | — | Maryland |
| 31 | Christine Dove | 2 | Daughter | — | Maryland |
| 32 | Aline Dove | 0 | Daughter | — | Maryland |
| 33 | Elmer Sims | 41 | Head | — | Maryland |
| 34 | Carroll Sims | 36 | Brother | Truck Driver | Maryland |
| 35 | Winnie Sims | 27 | Nephew | Laborer | Maryland |
| 36 | Sarah Sims | 83 | Mother | — | Maryland |
| 37 | Isabel Sims | 35 | Sister in Law | Housekeeper | Maryland |
| 38 | Ernest Vincent | 34 | Head | — | Maryland |
| 39 | Sarah Vincent | 36 | Wife | Janitor | Maryland |
| 40 | John Vincent | 7 | 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)