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.~1927), then head of a 10-person household.
Age 13
b. ~1927
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Conley |
| Given Name | Mary Alice |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Park Ridge City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Highest Grade | No 7 |
| 1935 Residence | Same house |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Park Ridge City |
| Est. Birth Year | ~1927 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Alice Conley | Spouse | — | 40 | ~1900 |
| Patricia Conley | Daughter | — | 9 | ~1931 |
| Elizabeth Conley | Daughter | — | 5 | ~1935 |
| Judith Conley | Daughter | — | 6 | ~1934 |
| Mary Conley | Daughter | — | 13 | ~1927 |
| Helen Conley | Daughter | — | 15 | ~1925 |
| Helen Mcfarland | Other | — | 35 | ~1905 |
| Imogene Conley | Daughter | — | 11 | ~1929 |
| Harold Conley | Head | — | 47 | ~1893 |
| Charles Conley | Son | — | 2 | ~1938 |
Census Appearances
1930
Cook, Illinois
Daughter, age 2
Cook, Illinois · implied b. ~1928 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Conley |
| Given Name | Marjorie |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 13
Cook-County, Illinois · implied b. ~1927 — 10 household members
| Surname | Conley |
| Given Name | Mary Alice |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Park Ridge City |
| 1935 Residence (County) | Cook |
| Highest Grade | No 7 |
| 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 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 13 · b. ~1927 · Illinois
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Sibling
Charles Conley
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Conley
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Imogene Conley
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patricia Conley
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elizabeth Conley
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Judith Conley
Sibling · 1940 · age 6
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
34 people indexed on this census page (nara:1940:m-t0627-00780-00139)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Leona Stearns | 31 | Servant | Servant | Illinois |
| 42 | Thomas Herrick | 43 | Head | Rest-Aurant Mgr | Iowa |
| 43 | Mary Herrick | 40 | Wife | — | Iowa |
| 44 | Patricia Herrick | 11 | Daughter | — | Iowa |
| 45 | Benedict Miller | 42 | Head | Salesman | Illinois |
| 46 | Victoria Miller | 42 | Wife | — | Illinois |
| 47 | Walter R. Woltze | 43 | Head | Manager | Illinois |
| 48 | Alice Woltze | 38 | Wife | — | Illinois |
| 49 | Craig Woltze | 10 | Son | — | Illinois |
| 50 | John Woltze | 7 | Son | — | Illinois |
| 51 | David Garrity | 39 | Head | Manager | Illinois |
| 52 | Ruth Garrity | 37 | Wife | — | Illinois |
| 53 | Daniel Garrity | 8 | Son | — | Illinois |
| 54 | Leah Garrity | 5 | Son | — | Illinois |
| 55 | Elizabeth Garrity | 5 | Daughter | — | Illinois |
| 56 | Walter Stegner | 47 | Head | Salesman | Ohio |
| 57 | Florence Stegner | 46 | Wife | — | Ohio |
| 58 | William Stegner | 17 | Son | — | Ohio |
| 59 | Harold Conley | 47 | Head | Med. Doctor | Wisconsin |
| 60 | Alice Conley | 40 | Wife | — | Illinois |
| 61 | Helen Conley | 15 | Daughter | — | Illinois |
| 62 | Mary Alice Conley THIS PERSON | 13 | Daughter | — | Illinois |
| 63 | Imogene Conley | 11 | Daughter | — | Illinois |
| 64 | Patricia Conley | 9 | Daughter | — | Illinois |
| 65 | Judith Conley | 6 | Daughter | — | Illinois |
| 66 | Elizabeth Conley | 5 | Daughter | — | Illinois |
| 67 | Charles Conley | 2 | Son | — | Illinois |
| 68 | Helen Mcfarland | 35 | Servant | Servant | Illinois |
| 69 | William Horner | 75 | Head | — | Canada-Eng |
| 70 | Janet Horner | 70 | Wife | — | Illinois |
| 71 | Robert Horner | 45 | Son | Salesman | Illinois |
| 72 | Frieda Horner | 40 | Daughter-in-law | — | Illinois |
| 73 | Janet Horner | 18 | Daughter | — | Illinois |
| 74 | William Horner | 14 | Son | — | 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)