DS
Dorothy Sullivan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Dorothy Sullivan across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1924), then head of a 10-person household.
Age 16
b. ~1924
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Sullivan |
| Given Name | Dorothy |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Industry | 0 |
| Highest Grade | H 2 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1924 |
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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Dorothy | Age | Birth yr |
|---|---|---|---|---|
| Eileen Sullivan | Daughter | — | 14 | ~1926 |
| Edward Sullivan | Son | — | 12 | ~1928 |
| Lydia Sullivan | Spouse | — | 46 | ~1894 |
| Roger Sullivan | Son | — | 10 | ~1930 |
| Lawrence Sullivan | Son | — | 19 | ~1921 |
| Patricia Sullivan | Daughter | — | 24 | ~1916 |
| Daniel Sullivan | Son | — | 6 | ~1934 |
| James Sullivan | Son | — | 17 | ~1923 |
| John Sullivan | Head | — | 49 | ~1891 |
| Dorothy Sullivan | Daughter | — | 16 | ~1924 |
Census Appearances
1930
Cook, Illinois
Daughter, age 6
Cook, Illinois · implied b. ~1924 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sullivan |
| Given Name | Dorothy |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Minnesota |
| Mother's Birthplace | Michigan |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 16
Cook-County, Illinois · implied b. ~1924 — 10 household members
| Surname | Sullivan |
| Given Name | Dorothy |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Industry | 0 |
| Highest Grade | H 2 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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 Sullivan across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Dorothy Sullivan
Daughter · 1940 · age 16 · b. ~1924 · Illinois
★ You are viewing this record
Sibling
James Sullivan
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lawrence Sullivan
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Roger Sullivan
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patricia Sullivan
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Daniel Sullivan
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eileen Sullivan
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Sullivan
Sibling · 1940 · age 12
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 — Cook-County, Illinois
Open full size
1940 US Federal Census — Cook-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00939-01017)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Hattie A Nylund | 65 | Wife | — | Sweden |
| 2 | Lucille Nylund | 31 | Daughter | Stenographer | Illinois |
| 3 | Sylvia Nylund | 23 | Daughter | Office Clerk | Illinois |
| 4 | John Sullivan | 49 | Head | Owner | Minnesota |
| 5 | Lydia Sullivan | 46 | Wife | — | Michigan |
| 6 | Patricia Sullivan | 24 | Daughter | Waitress | Illinois |
| 7 | Lawrence Sullivan | 19 | Son | Bar Tender | Illinois |
| 8 | James Sullivan | 17 | Son | — | Illinois |
| 9 | Dorothy Sullivan THIS PERSON | 16 | Daughter | — | Illinois |
| 10 | Eileen Sullivan | 14 | Daughter | — | Illinois |
| 11 | Edward Sullivan | 12 | Son | — | Illinois |
| 12 | Roger Sullivan | 10 | Son | — | Illinois |
| 13 | Daniel Sullivan | 6 | Son | — | Illinois |
| 14 | Henry Le Maire | 48 | Head | Steel Casing | Michigan |
| 15 | Minnie Le Maire | 38 | Wife | — | Illinois |
| 16 | Henry Le Maire | 14 | Son | — | Illinois |
| 17 | Phyllis Le Maire | 11 | Daughter | — | Illinois |
| 18 | Elizabeth Le Maire | 5 | Daughter | — | Illinois |
| 19 | Geraldine Le Maire | 3 | Daughter | — | Illinois |
| 20 | Cornelius Van Natten | 58 | Head | Dealer | Holland |
| 21 | Jennie C Van Natten | 54 | Wife | — | Holland |
| 22 | Alice Van Natten | 33 | Daughter | Librarian | Illinois |
| 23 | Genevieve Van Natten | 17 | Daughter | — | Illinois |
| 24 | Alice De Cook | 82 | Mother-in-law | — | Holland |
| 25 | Henry Van Natten | 32 | Head | Sign Writer | Illinois |
| 26 | Hazel Van Natten | 32 | Wife | — | Illinois |
| 27 | Malachia Van Natten | 3 | Son | — | Illinois |
| 28 | Virginia Van Natten | 1 | Daughter | — | Illinois |
| 29 | Carl Hanson | 42 | Head | Electric Welder | Illinois |
| 30 | Adeline Hanson | 39 | Wife | — | Minnesota |
| 31 | Roger Hanson | 2 | Son | — | Illinois |
| 32 | Harold Biebe | 22 | Brother-in-law | Apprentice Electric Welder | Minnesota |
| 33 | Adelaide Pizzato | 60 | Head | — | Italy |
| 34 | Joe Pizzato | 25 | Son | Laborer | Italy |
| 35 | Lena Pizzato | 21 | Daughter | Salesclerk | Italy |
| 36 | Victorina Pizzato | 19 | Daughter | Laborer | Italy |
| 37 | Aldo Pizzato | 28 | Son | Salesclerk | Italy |
| 38 | Libera Pizzato | 28 | Daughter-in-law | — | Indiana |
| 39 | Massimo Pizzato | 54 | Brother-in-law | Laborer | Italy |
| 40 | Harry A Wellman | 60 | Head | Electrician | Kentucky |
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)