MC
Mary Connolly — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Cook, Illinois
Our Model Tree links this Mary Connolly across the 1930 and 1940 US Censuses in Cook, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1925), then head of a 8-person household.
Age 5
b. ~1925
Female
Daughter
Born: Illinois
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Cook, Illinois |
| Surname | Connolly |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Additional Details | |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago |
| 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.
8 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Connolly | Daughter | — | 5 | ~1925 |
| Katherine Connolly | Daughter | — | 9 | ~1921 |
| Patrick Connolly | Son | — | 11 | ~1919 |
| Anna Connolly | Daughter | — | 12 | ~1918 |
| Sarah Connolly | Spouse | — | 29 | ~1901 |
| Michael Connolly | Son | — | 14 | ~1916 |
| Michael Connolly | Head | — | 31 | ~1899 |
| Alice Connolly | Daughter | — | 7 | ~1923 |
Census Appearances
1930
Cook, Illinois
Daughter, age 5
Cook, Illinois · implied b. ~1925 — 8 household members
| Surname | Connolly |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 16
Cook-County, Illinois · implied b. ~1924 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Connelly |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Highest Grade | Hs 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 Connolly across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Connolly
Daughter · 1930 · age 5 · b. ~1925 · Illinois
★ You are viewing this record
Sibling
Alice Connolly
Sibling · 1930 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Michael Connolly
Sibling · 1930 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anna Connolly
Sibling · 1930 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patrick Connolly
Sibling · 1930 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Katherine Connolly
Sibling · 1930 · age 9
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
1930 US Federal Census — Cook, Illinois
Open full size
1930 US Federal Census — Cook, Illinois
Page Contents
50 people indexed on this census page (ia:1930:illinoiscensus00reel484:0733)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Michael Connolly | 31 | Head | Appraiser | Free State Ireland |
| 2 | Sarah Connolly | 29 | Wife | Chamber Maid | Irish Free State |
| 3 | Michael Connolly | 14 | Son | — | Illinois |
| 4 | Anna Connolly | 12 | Daughter | — | Illinois |
| 5 | Patrick Connolly | 11 | Son | — | Illinois |
| 6 | Katherine Connolly | 9 | Daughter | — | Illinois |
| 7 | Alice Connolly | 7 | Daughter | — | Illinois |
| 8 | Mary Connolly THIS PERSON | 5 | Daughter | — | Illinois |
| 9 | John Pons | 30 | Head | Truck Driver | Florida |
| 10 | Lola Pons | 24 | Wife | — | Indiana |
| 11 | Raymond Pons | 14 | Son | — | Illinois |
| 12 | Jackeline Pons | 1 | Daughter | — | Illinois |
| 13 | Emma Thomas | 33 | Head | — | Illinois |
| 14 | Russell Thomas | 14 | Son | — | Illinois |
| 15 | Leonard Thomas | 10 | Son | — | Illinois |
| 16 | Robert Thomas | 8 | Son | — | Illinois |
| 17 | John Thomas | 6 | Son | — | Illinois |
| 18 | Lorraine Thomas | 4 | Daughter | — | Illinois |
| 19 | Jacob Gonarkle | 60 | Lodger | Press Feeder | Germany |
| 20 | Mary Morgan | 60 | Head | Cook | Germany |
| 21 | John Boast | 45 | Head | Painter | Germany |
| 22 | Elizabeth Boast | 19 | Daughter | Stenographer | Illinois |
| 23 | Anna Boast | 17 | Daughter | Office Work | Illinois |
| 24 | Mary Boast | 12 | Daughter | — | Illinois |
| 25 | Paul Matteoni | 37 | Head | Tile Helper | Italy |
| 26 | Helen Matteoni | 35 | Wife | — | Illinois |
| 27 | Clorinda Matteoni | 14 | Daughter | — | Illinois |
| 28 | Eleanor Matteoni | 6 | Daughter | — | Illinois |
| 29 | Joseph Matteoni | 3 | Son | — | Illinois |
| 30 | Joseph Matteoni | 65 | Lodger | Peddler | Italy |
| 31 | Amelia Matteoni | 50 | Lodger | — | Italy |
| 32 | Armedia Matteoni | 22 | Daughter | Private Sec | Illinois |
| 33 | James S Jewell | 53 | Head | Machinery Mover | Maine |
| 34 | Augusta Jewell | 40 | Wife | — | Illinois |
| 35 | Amelia Frederickson | 80 | Mother | — | Norway |
| 36 | Ruth Jewell | 19 | Daughter | — | Illinois |
| 37 | John Jewell | 18 | Son | Lead Pourer | Illinois |
| 38 | Eleanor Jewell | 17 | Daughter | Order Clerk | Illinois |
| 39 | Arline Jewell | 11 | Daughter | — | Illinois |
| 40 | James Jewell | 9 | Son | — | Illinois |
| 41 | Jeanette Jewell | 1 | Daughter | — | Illinois |
| 42 | Nicholas Markovich | 45 | Head | Butcher | Hungary |
| 43 | Theresa Markovich | 40 | Wife | Musician Voice | Hungary |
| 44 | John Lavdner | 36 | Head | Driver | Illinois |
| 45 | Helen Lavdner | 30 | Wife | — | Illinois |
| 46 | William Lavdner | 4 | Son | — | Illinois |
| 47 | Richard Lavdner | 2 | Son | — | Illinois |
| 48 | John C Schmitt | 43 | Head | Variety Store | Texas |
| 49 | Anna Schmitt | 33 | Wife | — | Illinois |
| 50 | John H Schmitt | 13 | Son | — | Illinois |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)