MC
Mary Conley — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Conley across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1928), then head of a 7-person household.
Age 12
b. ~1928
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Conley |
| Given Name | Mary Patricia |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Class of Worker | 0 |
| Hours Worked | 0 |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago |
| 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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Myron Conley | Son | — | 19 | ~1921 |
| Harold Conley | Son | — | 23 | ~1917 |
| Mary Conley | Spouse | — | 47 | ~1893 |
| Gregory Conley | Son | — | 17 | ~1923 |
| Robert Conley | Son | — | 21 | ~1919 |
| Harold Conley | Head | — | 53 | ~1887 |
| Mary Conley | Daughter | — | 12 | ~1928 |
Census Appearances
1930
Cook, Illinois
Daughter, age 3
Cook, Illinois · implied b. ~1927 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Conly |
| Given Name | Marjorie |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | none |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 12
Cook-County, Illinois · implied b. ~1928 — 7 household members
| Surname | Conley |
| Given Name | Mary Patricia |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Class of Worker | 0 |
| Hours Worked | 0 |
| Highest Grade | No 7 |
| 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 Conley across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Conley
Daughter · 1940 · age 12 · b. ~1928 · Illinois
★ You are viewing this record
Sibling
Gregory Conley
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Conley
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Myron Conley
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Harold Conley
Sibling · 1940 · age 23
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-t0627-00996-00835)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Frank Murphy | 16 | son | — | Illinois |
| 42 | William Murphy | 14 | son | — | Illinois |
| 43 | Matteio Verde | 48 | Head | Machinist | Italy |
| 44 | Mary Verde | 48 | wife | — | Italy |
| 45 | Louise Verde | 18 | daughter | — | Illinois |
| 46 | Concetta Verde | 16 | daughter | — | Illinois |
| 47 | Ben Duwaldt | 37 | Head | Tool & Dye Maker | Illinois |
| 48 | Anna Duwaldt | 32 | wife | — | Illinois |
| 49 | Wallace Duwaldt | 12 | son | — | Illinois |
| 50 | Katherine Duwaldt | 5 | daughter | — | Illinois |
| 51 | Wallace Sheehan | 35 | brother-in-law | Clerical | Illinois |
| 52 | Nick Kachavos | 56 | Head | Owner | Greece |
| 53 | Helen Kachavos | 41 | wife | — | Greece |
| 54 | John Kachavos | 18 | son | Carrier Packages | Illinois |
| 55 | Mary Kachavos | 17 | daughter | — | Illinois |
| 56 | Georgia Kachavos | 15 | daughter | — | Illinois |
| 57 | George Kachavos | 14 | son | — | Illinois |
| 58 | Angeline Kachavos | 12 | daughter | — | Illinois |
| 59 | John Desas | 55 | Head | Part Owner | Greece |
| 60 | Mary Desas | 40 | wife | — | Greece |
| 61 | Harry Papas | 44 | brother | Part Owner | Greece |
| 62 | Frank Papas | 45 | brother | Clerk Soda Fountain | Greece |
| 63 | Helen Papas | 43 | sister-in-law | — | Greece |
| 64 | Connie Adams | 47 | Head | Boiler Room Helper | Illinois |
| 65 | Edith Adams | 45 | wife | — | Illinois |
| 66 | Connie Jr. Adams | 19 | son | Errand Boy | Illinois |
| 67 | Claude Miller | 27 | son-in-law | Bartender | Georgia |
| 68 | Verle Miller | 26 | daughter | Supervisor | Illinois |
| 69 | Gerald Miller | 6 | grandson | — | S. Dakota |
| 70 | Ray Wagner | 30 | brother-in-law | Decorator | Illinois |
| 71 | Margaret Hill | 56 | Head | — | Irish Free State |
| 72 | Sylvia Hill | 25 | daughter | Buyer | Illinois |
| 73 | Patrick Quianlivan | 38 | nephew | Tile Maker | Irish Free State |
| 74 | Harold Conley | 53 | Head | Clerk | Illinois |
| 75 | Mary Conley | 47 | wife | — | Pennsylvania |
| 76 | Harold Jr. Conley | 23 | son | — | Illinois |
| 77 | Robert Conley | 21 | son | Asst. Production | Illinois |
| 78 | Myron Conley | 19 | son | — | Illinois |
| 79 | Gregory Conley | 17 | son | — | Illinois |
| 80 | Mary Patricia Conley THIS PERSON | 12 | 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)