MS
Margaret Sullivan — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Margaret Sullivan across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Patrick & Patrick — first a daughter (b.~1910), then head of a 4-person household.
Age 30
b. ~1910
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Sullivan |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 30 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Waitress |
| Industry | Restaurant |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 560 |
| Highest Grade | G 8 |
| 1935 Residence | Same House |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Waitress |
| Township / Ward | Chicago |
| Est. Birth Year | ~1910 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Margaret | Age | Birth yr |
|---|---|---|---|---|
| Margaret Sullivan | Daughter | — | 30 | ~1910 |
| Catherine Sullivan | Daughter | — | 25 | ~1915 |
| Catherine Sullivan | Head | — | 74 | ~1866 |
| Jeremiah Sullivan | Son | — | 28 | ~1912 |
Census Appearances
1920
Cook, Illinois
Daughter, age 10
Cook, Illinois · implied b. ~1910 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sullivan |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Daughter, age 20
Cook, Illinois · implied b. ~1910 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sullivan |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | General Office |
| Industry | Work |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 30
Cook-County, Illinois · implied b. ~1910 — 4 household members
| Surname | Sullivan |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 30 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Occupation | Waitress |
| Industry | Restaurant |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 560 |
| Highest Grade | G 8 |
| 1935 Residence | Same House |
| 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 Margaret Sullivan across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Patrick Sullivan (~0.92 confidence) and father Patrick Sullivan (~0.92 confidence) and mother Margaret Sullivan (~0.92 confidence) and mother Julia Sullivan (~0.92 confidence) and mother Catherine Sullivan (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Patrick Sullivan
b. ~1877
Source father
● Household
· direct · ~0.92
Father
Patrick Sullivan
b. ~1877
Source father
● Household
· direct · ~0.92
Mother
Margaret Sullivan
b. ~1882
Source mother
● Household
· direct · ~0.92
Mother
Julia Sullivan
b. ~1884
Source mother
● Household
· direct · ~0.92
Mother
Catherine Sullivan
b. ~1866
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Margaret Sullivan
Daughter · 1940 · age 30 · b. ~1910 · Illinois
★ You are viewing this record
Sibling
Catherine Sullivan
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jeremiah Sullivan
Sibling · 1940 · age 28
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-t0627-00976-00520)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Pridgie Damiacontro | 22 | Daughter | Office Clerk | Illinois |
| 42 | Rose Damiacontro | 20 | Daughter | Sales Clerk | Illinois |
| 43 | Guy Buonicontro | 40 | Head | Foreman | Illinois |
| 44 | Margaret Buonicontro | 34 | Wife | — | Illinois |
| 45 | James Buonicontro | 13 | Son | — | Illinois |
| 46 | Marie Buonicontro | 12 | Daughter | — | Illinois |
| 47 | Albert Harrison | 37 | Head | Pullman Mechanic | Texas |
| 48 | Martha Harrison | 39 | Wife | — | Oklahoma |
| 49 | Thomas Harrison | 18 | Son | Chauffeur | Oklahoma |
| 50 | Florence Harrison | 10 | Daughter | — | Illinois |
| 51 | John Mccutcheon | 34 | Head | Division Superintendent | Illinois |
| 52 | Eloise Mccutcheon | 29 | Wife | — | Illinois |
| 53 | Eleanor Mccutcheon | 11 | Daughter | — | Illinois |
| 54 | Barbara Mccutcheon | 9 | Daughter | — | Illinois |
| 55 | John A. Mccutcheon | 5 | Son | — | Illinois |
| 56 | William Marshy | 65 | Head | — | Indiana |
| 57 | Mamie Marshy | 50 | Wife | — | Georgia |
| 58 | Edward Marshy | 15 | Son | — | Illinois |
| 59 | Mamie Marshy | 14 | Daughter | — | Illinois |
| 60 | William Jr. Marshy | 12 | Son | — | Illinois |
| 61 | Wilda Marshy | 9 | Daughter | — | Illinois |
| 62 | William Walker | 45 | Head | — | Iowa |
| 63 | Elizabeth Walker | 43 | Wife | — | Illinois |
| 64 | John J. Donovan | 21 | Lodger | Chauffeur Helper | Illinois |
| 65 | Catherine Sullivan | 74 | Head | — | Eire |
| 66 | Margaret Sullivan THIS PERSON | 30 | Daughter | Waitress | Illinois |
| 67 | Jeremiah Sullivan | 28 | Son | Policeman | Illinois |
| 68 | Catherine Sullivan | 25 | Daughter | — | Illinois |
| 69 | Peter J. Gleeson | 48 | Head | Fire Captain | Illinois |
| 70 | Catherine Gleeson | 43 | Wife | — | Illinois |
| 71 | Margaret Dewar | 49 | Sister in law | Dining Room Matron | Illinois |
| 72 | William H. Stoughton | 82 | Head | — | Michigan |
| 73 | Della M. Stoughton | 77 | Wife | — | Michigan |
| 74 | Sanford T. Stoughton | 77 | Brother | — | Michigan |
| 75 | Anna Goldberg | 66 | Head | — | Russia |
| 76 | Albert Goldberg | 40 | Son | Pressman'S Helper | Illinois |
| 77 | Edith Goldberg | 38 | Daughter | Bookkeeper | Illinois |
| 78 | Carl Goldberg | 35 | Son | Salesclerk | Illinois |
| 79 | Benjamin Goldberg | 33 | Son | Sales Clerk | Illinois |
| 80 | James Fleshman | 38 | Head | Dairy Milk Washer | Indiana |
Related Census Records
Pedigree Summary
Margaret + 2 siblings
Gen 1 · 5 parents
~0.92
Max depth 4 (1900–1950 window)
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)