MN
Mary Nolan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Nolan across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1925), then head of a 12-person household.
Age 15
b. ~1925
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Nolan |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Highest Grade | H-1 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1925 |
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.
12 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Margaret Nolan | Daughter | — | 10 | ~1930 |
| Patricia Nolan | Daughter | — | 8 | ~1932 |
| Mary Nolan | Daughter | — | 15 | ~1925 |
| Frank Nolan | Head | — | 52 | ~1888 |
| John Conway | Other | — | 40 | ~1900 |
| Joseph Conway | Other | — | 27 | ~1913 |
| James Nolan | Son | — | 22 | ~1918 |
| Francis Nolan | Son | — | 17 | ~1923 |
| John Nolan | Son | — | 19 | ~1921 |
| Robert Nolan | Son | — | 12 | ~1928 |
| Thomas Nolan | Son | — | 14 | ~1926 |
| Margaret Nolan | Spouse | — | 48 | ~1892 |
Census Appearances
1930
Cook, Illinois
Daughter, age 4
Cook, Illinois · implied b. ~1926 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Nolan |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 15
Cook-County, Illinois · implied b. ~1925 — 12 household members
| Surname | Nolan |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Highest Grade | H-1 |
| 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 Mary Nolan across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Nolan
Daughter · 1940 · age 15 · b. ~1925 · Illinois
★ You are viewing this record
Sibling
John Nolan
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Nolan
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Francis Nolan
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Nolan
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patricia Nolan
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Nolan
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Nolan
Sibling · 1940 · age 14
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-t0627-00945-00443)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John Winkler | 44 | Head | Bar Tender | Germany |
| 2 | Elizabeth Winkler | 44 | Wife | — | Yugoslavia |
| 3 | John Winkler | 12 | Son | — | Illinois |
| 4 | Betty Winkler | 9 | Daughter | — | Illinois |
| 5 | Peter Koch | 58 | Head | Baker | Austria |
| 6 | Eva Koch | 48 | Wife | Housekeeper | Austria |
| 7 | Martin Koch | 26 | Son | Salesman | New Jersey |
| 8 | Alex Koch | 18 | Son | — | Pennsylvania |
| 9 | James Ryan | 44 | Head | Foreman | Illinois |
| 10 | Mary Jane Ryan | 44 | Wife | — | Illinois |
| 11 | Robert Ryan | 10 | Son | — | Illinois |
| 12 | Frank Nolan | 52 | Head | Policeman | Illinois |
| 13 | Margaret Nolan | 48 | Wife | — | Illinois |
| 14 | James Nolan | 22 | Son | Clerk | Illinois |
| 15 | John Nolan | 19 | Son | Office Clerk | Illinois |
| 16 | Francis Nolan | 17 | Son | — | Illinois |
| 17 | Mary Nolan THIS PERSON | 15 | Daughter | — | Illinois |
| 18 | Thomas Nolan | 14 | Son | — | Illinois |
| 19 | Robert Nolan | 12 | Son | — | Illinois |
| 20 | Margaret Nolan | 10 | Daughter | — | Illinois |
| 21 | Patricia Nolan | 8 | Daughter | — | Illinois |
| 22 | John Conway | 40 | Lodger | Policeman | Illinois |
| 23 | Joseph Conway | 27 | Lodger | Clerk | Illinois |
| 24 | Henry Dorner | 25 | Head | — | Illinois |
| 25 | Myrtle Dorner | 44 | Daughter | — | Illinois |
| 26 | Earl Dorner | 43 | Lodger | Radio Salesman | Illinois |
| 27 | Walter C. Corrie | 68 | Lodger | Surgical Fitting | England |
| 28 | Mary Luesche | 66 | Head | — | Illinois |
| 29 | Amada Luesche | 44 | Daughter | Office Clerk | Illinois |
| 30 | Mary Slattery | 44 | Head | — | Northwestern |
| 31 | James Slattery | 21 | Son | Junior Clerk | Illinois |
| 32 | Marie Slattery | 19 | Daughter | House Work | Illinois |
| 33 | Lorraine Slattery | 17 | Daughter | Office Clerk | Illinois |
| 34 | Ruth Slattery | 15 | Daughter | — | Illinois |
| 35 | John Slattery | 12 | Son | — | Illinois |
| 36 | Dolores Slattery | 10 | Daughter | — | Illinois |
| 37 | Ilene Slattery | 7 | Daughter | — | Illinois |
| 38 | Barbara Hickey | 79 | Board-Daughter | — | Illinois |
| 39 | Malvern Williams | 47 | Head | Insurance Agent | Ohio |
| 40 | Theda Williams | 42 | Wife | — | Illinois |
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)