MC
Margaret Cooper — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Baltimore-City-County, Maryland
Our Model Tree links this Margaret Cooper across the 1930 and 1940 US Censuses in Baltimore-City-County, Maryland (XGBoost, ~Confirmed) — first a daughter (b.~1918), then head of a 13-person household.
Age 22
b. ~1918
Female
Daughter
Born: Maryland
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Baltimore-City-County, Maryland |
| Surname | Cooper |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Baltimore City |
| Est. Birth Year | ~1918 |
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.
13 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Margaret | Age | Birth yr |
|---|---|---|---|---|
| Gladys Jones | Daughter | — | 30 | ~1910 |
| Adrienne Cooper | Daughter | — | 3 | ~1937 |
| Ernest Cooper | Son | — | 5 | ~1935 |
| Dalray Cooper | Son | — | 1 | ~1939 |
| Florence Cooper | Head | — | 53 | ~1887 |
| Osborne Cooper | Son | — | 3 | ~1937 |
| Catherine Cooper | Daughter | — | 20 | ~1920 |
| Claudenia Beaty | Daughter | — | 31 | ~1909 |
| Margaret Cooper | Daughter | — | 22 | ~1918 |
| Donald Cooper | Son | — | 5 | ~1935 |
| Joy Jones | Other | — | 6 | ~1934 |
| Clarice Jones | Other | — | 10 | ~1930 |
| Dorothy Jones | Other | — | 8 | ~1932 |
Census Appearances
1930
Baltimore, Maryland
Daughter, age 11
Baltimore, Maryland · implied b. ~1919 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cooper |
| Given Name | Margaret T. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Can Read/Write | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Baltimore-City-County, Maryland
Daughter, age 22
Baltimore-City-County, Maryland · implied b. ~1918 — 13 household members
| Surname | Cooper |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| Income (1939) | 0 |
| Highest Grade | Hs 4 |
| 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 Margaret Cooper across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Margaret Cooper
Daughter · 1940 · age 22 · b. ~1918 · Maryland
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Sibling
Osborne Cooper
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ernest Cooper
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Donald Cooper
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dalray Cooper
Sibling · 1940 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Adrienne Cooper
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Claudenia Beaty
Sibling · 1940 · age 31
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Gladys Jones
Sibling · 1940 · age 30
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Cooper
Sibling · 1940 · age 20
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-t0627-01534-00691)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Nathaniel Johnson | 21 | Son | Janitor | Maryland |
| 42 | Louise Johnson | 19 | Daughter | — | Maryland |
| 43 | Edgar Sye | 53 | Boarder | Janitor | Maryland |
| 44 | Howard Sye | 43 | Brother | — | Maryland |
| 45 | Grover Washington | 53 | Lodger | Seamstress | Virginia |
| 46 | William Johnson | 34 | Head | Lineman | S. Carolina |
| 47 | Ethel Johnson | 31 | Wife | — | S. Carolina |
| 48 | Arthur Johnson | 14 | Son | — | Maryland |
| 49 | Erlene Johnson | 12 | Daughter | — | Maryland |
| 50 | Irvin Johnson | 10 | Son | — | Maryland |
| 51 | Thelma Johnson | 9 | Daughter | — | Maryland |
| 52 | Shirley Johnson | 7 | Daughter | — | Maryland |
| 53 | Herman Johnson | 5 | Son | — | Maryland |
| 54 | Mary Johnson | 3 | Daughter | — | Maryland |
| 55 | Ethel Johnson | 1 | Daughter | — | Maryland |
| 56 | Susie Johnson | 66 | Mother | — | S. Carolina |
| 57 | Harriet Clark | 50 | Lodger | — | S. Carolina |
| 58 | Booker Clark | 21 | Lodger | Laborer | S. Carolina |
| 59 | John Sances | 82 | Head | — | Maryland |
| 60 | Emma Sances | 80 | Wife | — | Maryland |
| 61 | Alice Haas | 66 | Head | — | Maryland |
| 62 | Percy Matthews | 40 | Head | Chauffeur | Maryland |
| 63 | Mabel Matthews | 46 | Wife | — | Maryland |
| 64 | Percy Jr. Matthews | 5 | Son | — | Maryland |
| 65 | Jerome Washington | 31 | Step Son | Musician | Maryland |
| 66 | Martha Washington | 17 | Step Daughter-in-law | New Worker | Maryland |
| 67 | Douglas Washington | 13 | Step Son | — | Maryland |
| 68 | Florence Cooper | 53 | Head | — | Maryland |
| 69 | Margaret Cooper THIS PERSON | 22 | Daughter | — | Maryland |
| 70 | Catherine Cooper | 20 | Daughter | Presser | Maryland |
| 71 | Donald Cooper | 5 | Son | — | Maryland |
| 72 | Ernest Cooper | 5 | Son | — | Maryland |
| 73 | Osborne Cooper | 3 | Son | — | Maryland |
| 74 | Adrienne Cooper | 3 | Daughter | — | Maryland |
| 75 | Dalray Cooper | 1 | Son | — | Maryland |
| 76 | Gladys Jones | 30 | Daughter | Presser | Maryland |
| 77 | Clarice Jones | 10 | Grand Daughter | — | Maryland |
| 78 | Dorothy Jones | 8 | Grand Daughter | — | Maryland |
| 79 | Joy Jones | 6 | Grand Daughter | — | Maryland |
| 80 | Claudenia Beaty | 31 | Daughter | Presser | 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)