LC
Lillian Cook — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Baltimore-City-County, Maryland
Our Model Tree links this Lillian Cook across the 1930 and 1940 US Censuses in Baltimore-City-County, Maryland (XGBoost, ~Confirmed) — first a daughter (b.~1928), then head of a 14-person household.
Age 12
b. ~1928
Female
Daughter
Born: Maryland
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Baltimore-City-County, Maryland |
| Surname | Cook |
| Given Name | Lillian L. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| Additional Details | |
| Highest Grade | H-1 |
| 1935 Residence | Same Home |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Baltimore City |
| Est. Birth Year | ~1928 |
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.
14 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Lillian | Age | Birth yr |
|---|---|---|---|---|
| William Cook | Other | — | 1 | ~1939 |
| Robert Cook | Son | — | 14 | ~1926 |
| William Cook | Head | — | 48 | ~1892 |
| Elsie Cook | Daughter | — | 21 | ~1919 |
| William Cook | Son | — | 24 | ~1916 |
| Harry Cook | Son | — | 23 | ~1917 |
| Thelma Cook | Daughter | — | 19 | ~1921 |
| Helen Cook | Daughter | — | 8 | ~1932 |
| Charles Cook | Son | — | 6 | ~1934 |
| Eva Cook | Spouse | — | 48 | ~1892 |
| Lillian Cook | Daughter | — | 12 | ~1928 |
| Lillian Cook | Other | — | 20 | ~1920 |
| Warren Cook | Son | — | 10 | ~1930 |
| Muriel Cook | Daughter | — | 16 | ~1924 |
Census Appearances
1930
Baltimore, Maryland
Daughter, age 3
Baltimore, Maryland · implied b. ~1927 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cook |
| Given Name | Loastine |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | South Carolina |
| Mother's Birthplace | Virginia |
| Occupation | none |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Baltimore-City-County, Maryland
Daughter, age 12
Baltimore-City-County, Maryland · implied b. ~1928 — 14 household members
| Surname | Cook |
| Given Name | Lillian L. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| Highest Grade | H-1 |
| 1935 Residence | Same Home |
| 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 Lillian Cook across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Lillian Cook
Daughter · 1940 · age 12 · b. ~1928 · Maryland
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Sibling
Robert Cook
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Charles Cook
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thelma Cook
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Harry Cook
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Cook
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Muriel Cook
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Cook
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Warren Cook
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elsie Cook
Sibling · 1940 · age 21
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-t0627-01535-00121)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Matilda Falk | 46 | Head | — | Maryland |
| 2 | Robert J. Moonan | 25 | Head | Inspector | Maryland |
| 3 | Audrey Moonan | 24 | Wife | — | Maryland |
| 4 | Robert Jr. Moonan | 4 | Son | — | Maryland |
| 5 | Melvin Moonan | 3 | Son | — | Maryland |
| 6 | Robt. Saas | 60 | Head | Painter | Maryland |
| 7 | Clara Saas | 58 | Wife | — | Maryland |
| 8 | Thelma Van Fosson | 27 | Daughter | — | Maryland |
| 9 | Raymond J. Van Fosson | 5 | Grandson | — | Maryland |
| 10 | Mary Saas | 89 | Mother | — | Maryland |
| 11 | Charles Kehs | 65 | Head | — | Maryland |
| 12 | Joseph Kehs | 37 | Son | Clerk | Maryland |
| 13 | George Maurer | 37 | Head | Laborer | Maryland |
| 14 | Evelyn Maurer | 33 | Wife | — | Maryland |
| 15 | Betty Lou Haynie | 4 | Lodger | — | Maryland |
| 16 | Robert Jennings | 19 | Nephew | Laborer | Maryland |
| 17 | Gloria Jennings | 17 | Niece | — | Maryland |
| 18 | Florence Jennings | 5 | Niece | — | Maryland |
| 19 | Stella Maurer | 48 | Sister | — | Maryland |
| 20 | John H. Maurer | 70 | Father | — | Maryland |
| 21 | Charles E. Anderson | 29 | Head | Porter | Maryland |
| 22 | Margaret D. Anderson | 25 | Wife | — | Maryland |
| 23 | John F. Anderson | 2 | Son | — | Maryland |
| 24 | Charles D. Anderson | 1 | Son | — | Maryland |
| 25 | William E. Cook | 48 | Head | Fireman | Maryland |
| 26 | Eva F. Cook | 48 | Wife | — | Maryland |
| 27 | Harry E. Cook | 23 | Son | Cutter | Maryland |
| 28 | Elsie E. Cook | 21 | Daughter | Packer | Maryland |
| 29 | Thelma L. Cook | 19 | Daughter | New Worker | Maryland |
| 30 | Muriel D. Cook | 16 | Daughter | — | Maryland |
| 31 | Robert E. Cook | 14 | Son | — | Maryland |
| 32 | Lillian L. Cook THIS PERSON | 12 | Daughter | — | Maryland |
| 33 | Warren D. Cook | 10 | Son | — | Maryland |
| 34 | Helen J. Cook | 8 | Daughter | — | Maryland |
| 35 | Charles Cook | 6 | Son | — | Maryland |
| 36 | William E. Cook | 24 | Son | Laborer | Maryland |
| 37 | Lillian M. Cook | 20 | Daughter-in-law | — | Maryland |
| 38 | William E. Cook | 1 | Grandson | — | Maryland |
| 39 | Jacob Rotizer | 56 | Head | Retail | Lithuania |
| 40 | Rose Rotizer | 56 | Wife | — | Lithuania |
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)