MD
Mary Donnelly — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Cook, Illinois
Our Model Tree links this Mary Donnelly across the 1930 and 1940 US Censuses in Cook, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1909), then head of a 9-person household.
Age 21
b. ~1909
Female
Daughter
Born: Illinois
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Cook, Illinois |
| Surname | Donnelly |
| Given Name | Mary C. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Illinois |
| Additional Details | |
| Occupation | Saleslady |
| Industry | Dept. Store |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Saleslady |
| Township / Ward | Chicago |
| Est. Birth Year | ~1909 |
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.
9 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Donnelly | Daughter | — | 21 | ~1909 |
| Margaret Donnelly | Daughter | — | 20 | ~1910 |
| Margaret Donnelly | Daughter | — | 5 | ~1925 |
| Edward Donnelly | Head | — | 55 | ~1875 |
| William Donnelly | Son | — | 19 | ~1911 |
| Joseph Donnelly | Son | — | 25 | ~1905 |
| Thomas Donnelly | Son | — | 11 | ~1919 |
| Edward Donnelly | Son | — | 26 | ~1904 |
| Elizabeth Donnelly | Spouse | — | 50 | ~1880 |
Census Appearances
1930
Cook, Illinois
Daughter, age 21
Cook, Illinois · implied b. ~1909 — 9 household members
| Surname | Donnelly |
| Given Name | Mary C. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Illinois |
| Occupation | Saleslady |
| Industry | Dept. Store |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 32
Cook-County, Illinois · implied b. ~1908 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Donnelly |
| Given Name | Mae S. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 32 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Occupation | Stenographer |
| Industry | Building Sys |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1560 |
| 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 Donnelly across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Donnelly
Daughter · 1930 · age 21 · b. ~1909 · Illinois
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Sibling
Margaret Donnelly
Sibling · 1930 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Donnelly
Sibling · 1930 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Donnelly
Sibling · 1930 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Donnelly
Sibling · 1930 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Donnelly
Sibling · 1930 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Donnelly
Sibling · 1930 · age 5
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:illinoiscensus00reel461:0821)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | August H. Freitag | 47 | Head | Machinist | Iowa |
| 52 | Lydia Freitag | 43 | Wife | — | Iowa |
| 53 | William J. O'Brien | 24 | Boarder | Truck Driver | Iowa |
| 54 | Alois B. Hurd | 50 | Head | Foreman | Iowa |
| 55 | Mary A. Hurd | 45 | Wife | — | Iowa |
| 56 | Dorothy Hurd | 18 | Daughter | Stenographer | Iowa |
| 57 | Annie Campbell | 41 | Head | Carpenter | Illinois |
| 58 | Everett Campbell | 28 | Brother | — | Illinois |
| 59 | Edward J. Donnelly | 55 | Head | Clerk | Pennsylvania |
| 60 | Elizabeth Donnelly | 50 | Wife | — | Illinois |
| 61 | Edward Jr. Donnelly | 26 | Son | Electrician | Illinois |
| 62 | Joseph A. Donnelly | 25 | Son | Office Work | Illinois |
| 63 | Margaret S. Donnelly | 20 | Daughter | — | Illinois |
| 64 | William P. Donnelly | 19 | Son | Packer | Illinois |
| 65 | Mary C. Donnelly THIS PERSON | 21 | Daughter | Saleslady | Illinois |
| 66 | Thomas A. Donnelly | 11 | Son | — | Illinois |
| 67 | Margaret S. Donnelly | 5 | Daughter | — | Illinois |
| 68 | Julia O'Halloran | 45 | Head | — | Wisconsin |
| 69 | Charles A. Hill | 66 | Head | Parcel Post Clerk | Wisconsin |
| 70 | Anna M. Hill | 59 | Wife | — | Wisconsin |
| 71 | Lucile Madge Hill | 42 | Boarder | Stenographer | Missouri |
| 72 | Morris Strange | 48 | Head | — | Irish Free State |
| 73 | Joseph F. Boulman | 62 | Boarder | Decorator | New York |
| 74 | Donald M. Gaylord | 40 | Head | Sta. Engineer | Illinois |
| 75 | Iva M. Gaylord | 48 | Wife | — | Illinois |
| 76 | Edward A. Voss | 24 | Head | Oiler | Illinois |
| 77 | Elizabeth Voss | 25 | Wife | Stenographer | Nebraska |
| 78 | Arthur E. Voss | 4 | Son | — | Illinois |
| 79 | James E. Voss | 1 | Son | — | Illinois |
| 80 | Joseph Ecland | 88 | Head | Retired | Canada-French |
| 81 | Tillie H. Ecland | 79 | Wife | — | Canada-French |
| 82 | William H. Robinson | 31 | Head | Salesman | Illinois |
| 83 | Helen Robinson | 30 | Wife | Salesman | Illinois |
| 84 | Kate Robinson | 71 | Mother | — | Irish Free State |
| 85 | Gustav Ramine | 40 | Head | Foreman | Illinois |
| 86 | Mary Ramine | 38 | Wife | — | Illinois |
| 87 | Frank Ramine | 19 | Son | Packer | Illinois |
| 88 | Marie Ramine | 17 | Daughter | Apprentice | Illinois |
| 89 | Mary Mcnamee | 58 | Head | — | Irish Free State |
| 90 | James J. Mcnamee | 33 | Son | Clerk | Illinois |
| 91 | Edwin J. Starks | 34 | Head | Fireman | Illinois |
| 92 | Annie L. Starks | 27 | Wife | — | Illinois |
| 93 | Dorothy Starks | 6 | Daughter | — | Illinois |
| 94 | Milton G. Starks | 5 | Son | — | Illinois |
| 95 | Dolores Starks | 3 | Daughter | — | Illinois |
| 96 | Joseph Delaney | 60 | Head | Retired | Ireland |
| 97 | Anna A. Delaney | 28 | Son | Stenographer | Illinois |
| 98 | Barth Pellisella | 53 | Head | Druggist | Italy |
| 99 | Mary C. Pellisella | 51 | Wife | — | Iowa |
| 100 | Virginia D. Pellisella | 16 | Daughter | — | Illinois |
Related Census Records
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)