MC
Mary Cassidy — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Cook, Illinois
Our Model Tree links this Mary Cassidy across the 1920, 1930 and 1940 US Censuses in Cook, Illinois (XGBoost, ~Confirmed) — first a spouse (b.~1868), then head of a 4-person household.
Age 62
b. ~1868
Female
Spouse
Born: Illinois
Married
1930 Census Record Details
| Census Year | 1930 |
| Location | Cook, Illinois |
| Surname | Cassidy |
| Given Name | Mary H. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 62 |
| Marital Status | Married |
| Birthplace | Illinois |
| Age at First Marriage | 32 |
| Father's Birthplace | England |
| Mother's Birthplace | Irish Free State |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1868 |
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.
4 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Virginia Cassidy | Daughter | — | 22 | ~1908 |
| Irene Ferguson | Daughter | — | 31 | ~1899 |
| Thomas Cassidy | Head | — | 64 | ~1866 |
| Mary Cassidy | Spouse | — | 62 | ~1868 |
Census Appearances
1920
Cook, Illinois
Spouse, age 50
Cook, Illinois · implied b. ~1870 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cassidy |
| Given Name | Mary J. |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 50 |
| Marital Status | Married |
| Birthplace | Illinois |
| Father's Birthplace | England |
| Mother's Birthplace | Ireland |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Spouse, age 62
Cook, Illinois · implied b. ~1868 — 4 household members
| Surname | Cassidy |
| Given Name | Mary H. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 62 |
| Marital Status | Married |
| Birthplace | Illinois |
| Age at First Marriage | 32 |
| Father's Birthplace | England |
| Mother's Birthplace | Irish Free State |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Spouse, age 71
Cook-County, Illinois · implied b. ~1869 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cassidy |
| Given Name | Margaret |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 71 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago city |
| 1935 Residence (County) | Cook |
| Class of Worker | 0 |
| Hours Worked | 0 |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 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 Cassidy across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Cassidy
Spouse · 1930 · age 62 · b. ~1868 · Illinois
★ You are viewing this record
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:illinoiscensus00reel458:1056)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Frances Palineka | 43 | Head | — | Missouri |
| 2 | Jacqueline Peters | 5 | Grand da | — | Illinois |
| 3 | Daphne Peters | 2 | Grand da | — | Illinois |
| 4 | Lizzie Stross | 24 | Roomer | Operator | N. Dakota |
| 5 | Edith Borden | 25 | Roomer | — | Illinois |
| 6 | Arthur B. Wheeler | 40 | Roomer | Shipping Clerk | Missouri |
| 7 | Marie Wheeler | 34 | Roomer | Housekeeper | Illinois |
| 8 | James Godfrey | 47 | Roomer | Boilermaker | Missouri |
| 9 | Oscar L. Judas | 46 | Roomer | Blacksmith | Kansas |
| 10 | Robert Hellstrom | 29 | Roomer | Brakeman | Sweden |
| 11 | Cecil P. Linehan | 19 | Roomer | Clerk | Michigan |
| 12 | — | None | — | — | — |
| 13 | Fannie Limenstahl | 46 | Head | — | Ohio |
| 14 | Grace Limenstahl | 20 | Roomer | — | Illinois |
| 15 | Alice Slayer | 19 | Roomer | — | Pennsylvania |
| 16 | Norman Watts | 28 | Roomer | Machinist | England |
| 17 | Joe James | 40 | Roomer | Splicer | Illinois |
| 18 | William Holden | 50 | Roomer | Adjuster | Illinois |
| 19 | Raymond Allison | 30 | Roomer | Laborer | Iowa |
| 20 | Elmer Allison | 33 | Roomer | Laborer | Iowa |
| 21 | Thomas J. Cassidy | 64 | Head | Undertaker | Illinois |
| 22 | Mary H. Cassidy THIS PERSON | 62 | Wife | — | Illinois |
| 23 | Virginia Cassidy | 22 | Daughter | — | Illinois |
| 24 | Irene L. Ferguson | 31 | Daughter | — | Illinois |
| 25 | Alfred Lawrence | 68 | Head | — | England |
| 26 | Jane Lawrence | 69 | Wife | — | Canada-English |
| 27 | Edward Peterson | 60 | Brother | Conductor | Canada-English |
| 28 | Cora Crosbie | 42 | Roomer | Clerical | Illinois |
| 29 | Annie Halvorsen | 62 | Head | — | Norway |
| 30 | Roy Halvorsen | 24 | Son | Reinforcer | Illinois |
| 31 | Louise Haug | 23 | Roomer | Saleslady | Illinois |
| 32 | Eva Christensen | 21 | Roomer | Nurse | Norway |
| 33 | Eva Bunnard | 22 | Roomer | Switchboard Operator | Illinois |
| 34 | Eva Malone | 45 | Roomer | — | Irish Free State |
| 35 | Ruth Malone | 20 | Roomer | — | Illinois |
| 36 | Christine Malone | 22 | Roomer | — | Illinois |
| 37 | Elva Mcmuster | 22 | Roomer | Secretary | Illinois |
| 38 | Herman Welsh | 27 | Roomer | Telegrapher | Ohio |
| 39 | Hazel Welsh | 23 | Roomer | — | Ohio |
| 40 | Harold Halvorsen | 30 | Roomer | Ironworker | Illinois |
| 41 | Agnes Halvorsen | 23 | Roomer | — | Wisconsin |
| 42 | Jack Halvorsen | 1 | Roomer | — | Illinois |
| 43 | Albert Johnson | 40 | Roomer | Switchman | Minnesota |
| 44 | William O'Brien | 66 | Head | Judge | Illinois |
| 45 | Edward A. O'Brien | 38 | Son | Lawyer | Illinois |
| 46 | Walter S. Hosew | 42 | Head | Proprietor | Utah |
| 47 | Josephine Hosew | 36 | Wife | — | Utah |
| 48 | Walter Hosew | 17 | Son | — | Illinois |
| 49 | Lucia A. Hosew | 14 | Daughter | — | Illinois |
| 50 | Mary H. Hosew | 5 | Daughter | — | 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)