MD
Mary Dillon — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Dillon across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1922), then head of a 8-person household.
Age 18
b. ~1922
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Dillon |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Librarian |
| Industry | Public Library |
| Class of Worker | GW |
| Income (1939) | 360 |
| Highest Grade | H-4 |
| 1935 Residence | Same House |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Librarian |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1922 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Kathleen Dillon | Daughter | — | 17 | ~1923 |
| Mary Dillon | Daughter | — | 18 | ~1922 |
| James Dillon | Head | — | 55 | ~1885 |
| William Dillon | Son | — | 13 | ~1927 |
| Patrick Dillon | Son | — | 20 | ~1920 |
| Timothy Dillon | Son | — | 21 | ~1919 |
| James Dillon | Son | — | 24 | ~1916 |
| Alina Dillon | Spouse | — | 51 | ~1889 |
Census Appearances
1930
Cook, Illinois
Daughter, age 7
Cook, Illinois · implied b. ~1923 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Dillon |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Irish Fr State |
| Mother's Birthplace | Irish Fr State |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 18
Cook-County, Illinois · implied b. ~1922 — 8 household members
| Surname | Dillon |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | Librarian |
| Industry | Public Library |
| Class of Worker | GW |
| Income (1939) | 360 |
| Highest Grade | H-4 |
| 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 Mary Dillon across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Dillon
Daughter · 1940 · age 18 · b. ~1922 · Illinois
★ You are viewing this record
Sibling
James Dillon
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Kathleen Dillon
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patrick Dillon
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Dillon
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Timothy Dillon
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 — 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-t0627-00936-00073)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Stella C Holmes | 67 | Head | — | Iowa |
| 42 | Florence C Nelson | 69 | Sister | — | Iowa |
| 43 | Ada Cameron | 80 | Aunt | — | Ohio |
| 44 | Albert Curtis | 56 | Head | Investigator | Illinois |
| 45 | Mignon Curtis | 59 | Wife | — | Illinois |
| 46 | William C Curtis | 22 | Son | Pianist | Illinois |
| 47 | Ray W Smith | 47 | Head | Broker | Iowa |
| 48 | Bernice B Smith | 50 | Wife | — | Kansas |
| 49 | Charles Burmeister | 67 | Head | Hoisting Engineer | New York |
| 50 | Anna Burmeister | 67 | Wife | — | Denmark |
| 51 | Otto Huebner | 69 | Head | — | Kentucky |
| 52 | John W Towne | 41 | Son-in-law | Civil Engineer | Iowa |
| 53 | Dorothy Towne | 40 | Daughter | Teacher | Kentucky |
| 54 | James G Condax | 55 | Head | Buyer | Illinois |
| 55 | Muriel Condax | 39 | Wife | — | Canada-Eng |
| 56 | Carol Condax | 5 | Daughter | — | Illinois |
| 57 | Florence Condax | 47 | Sister | — | Illinois |
| 58 | Louise Peterson | 62 | Cousin | — | Sweden |
| 59 | Edward B Cason | 50 | Head | Lawyer | Illinois |
| 60 | Edith Cason | 49 | Wife | — | Illinois |
| 61 | James Dillon | 55 | Head | Watchman | Ireland-Eire |
| 62 | Alina Dillon | 51 | Wife | — | Ireland-Eire |
| 63 | James G Dillon | 24 | Son | Switchman | Illinois |
| 64 | Timothy Dillon | 21 | Son | Gardener | Illinois |
| 65 | Patrick Dillon | 20 | Son | — | Illinois |
| 66 | Mary Dillon THIS PERSON | 18 | Daughter | Librarian | Illinois |
| 67 | Kathleen Dillon | 17 | Daughter | — | Illinois |
| 68 | William Dillon | 13 | Son | — | Illinois |
| 69 | Thomas Kirkwood | 55 | Head | Watchman | Illinois |
| 70 | Katherine Kirkwood | 59 | Wife | — | Germany |
| 71 | Arthur Kirkwood | 23 | Son | Machinist Apprentice | Illinois |
| 72 | Joseph J Mayol | 33 | Head | Manager | Louisiana |
| 73 | Myrtle Mayol | 31 | Wife | — | Louisiana |
| 74 | Carol Lee Mayol | 10 | Daughter | — | Louisiana |
| 75 | Donald Mayol | 7 | Son | — | Louisiana |
| 76 | John Spaniel | 66 | Head | Auto Trimmer | Illinois |
| 77 | Matilda Spaniel | 59 | Wife | — | Illinois |
| 78 | William Moran | 42 | Head | Patrolman | Pennsylvania |
| 79 | Anna Moran | 42 | Wife | — | Illinois |
| 80 | Marie H Moran | 16 | Daughter | — | Illinois |
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)