MD
Mary Duggan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Duggan across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1893), then head of a 6-person household.
Age 47
b. ~1893
Female
Head
Born: Ireland
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Duggan |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 47 |
| Marital Status | Widowed |
| Birthplace | Ireland |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Janitress |
| Industry | office building |
| Class of Worker | PW |
| Hours Worked | 36 |
| Income (1939) | 650 |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
| Occupation | Janitress |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1893 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Edward Duggan | Son | — | 21 | ~1919 |
| Connor Duggan | Son | — | 16 | ~1924 |
| Mary Duggan | Daughter | — | 25 | ~1915 |
| Josephine Duggan | Daughter | — | 18 | ~1922 |
| Mary Duggan | Head | — | 47 | ~1893 |
| Ann Duggan | Daughter | — | 23 | ~1917 |
Census Appearances
1930
Cook, Illinois
Spouse, age 39
Cook, Illinois · implied b. ~1891 — 35 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Dugan |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 39 |
| Marital Status | Married |
| Birthplace | Ireland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1912 |
| Age at First Marriage | 24 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1940
Cook-County, Illinois
Head, age 47
Cook-County, Illinois · implied b. ~1893 — 6 household members
| Surname | Duggan |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 47 |
| Marital Status | Widowed |
| Birthplace | Ireland |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Occupation | Janitress |
| Industry | office building |
| Class of Worker | PW |
| Hours Worked | 36 |
| Income (1939) | 650 |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
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 Duggan across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Duggan
Head · 1940 · age 47 · b. ~1893 · Illinois
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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-t0627-00983-00502)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Ruth Adin | 16 | daughter | — | New York |
| 42 | Fanny Adin | 15 | daughter | — | New York |
| 43 | Arthur Adin | 13 | son | — | New Jersey |
| 44 | Bernard Adin | 1 | son | — | Illinois |
| 45 | Rose R Leonard | 47 | Head | Finisher | Russia |
| 46 | Seymour Leonard | 16 | son | — | Illinois |
| 47 | Samuel Leonard | 14 | son | — | Illinois |
| 48 | Milton Leonard | 10 | son | — | Illinois |
| 49 | Morris Tefenson | 55 | lodger | Laborer | Russia |
| 50 | William Linsky | 81 | Head | — | Lithuania |
| 51 | Percy B Linsky | 46 | son | Salesman (Shoes) | Lithuania |
| 52 | Morris Riegner | 29 | Head | Manager | Illinois |
| 53 | Mazie Riegner | 25 | wife | — | Illinois |
| 54 | Burton Riegner | 7 | son | — | Illinois |
| 55 | Louis Riegner | 6 | son | — | Illinois |
| 56 | Norman Riegner | 5 | son | — | Illinois |
| 57 | Sherwin Riegner | 2 | son | — | Illinois |
| 58 | Mary Duggan THIS PERSON | 47 | Head | Janitress | Ireland |
| 59 | Mary Q Duggan | 25 | daughter | Assembler | Illinois |
| 60 | Ann Duggan | 23 | daughter | Gen. Factory Work | Illinois |
| 61 | Edward Duggan | 21 | son | Assembler | Illinois |
| 62 | Josephine Duggan | 18 | daughter | Assembler | Illinois |
| 63 | Connor Duggan | 16 | son | — | Illinois |
| 64 | Theodore Malychey | 46 | Head | Laborer | Poland |
| 65 | Mary A Malychey | 43 | wife | — | Poland |
| 66 | Theodore Jr Malychey | 18 | son | Stock Boy | Illinois |
| 67 | Edward Wolf | 27 | Head | Packer | Illinois |
| 68 | Eleanor Wolf | 24 | wife | Folder | Illinois |
| 69 | Gloria Wolf | 4 | daughter | — | Illinois |
| 70 | Joseph Wojcik | 63 | lodger | Solderer | Poland |
| 71 | Rose Gottlieb | 80 | Head | — | Hungary |
| 72 | Joseph A Feldheim | 51 | son | Watchman | Hungary |
| 73 | Max Batkin | 44 | Head | Dentist | Russia |
| 74 | Helene A Batkin | 33 | wife | Millinery Worker | Hungary |
| 75 | Mildred Marian Batkin | 13 | daughter | — | Illinois |
| 76 | Nancy Joyce Batkin | 2 | daughter | — | Illinois |
| 77 | Hattie King | 25 | servant | Servant | Ohio |
| 78 | Rebecca Wilonsky | 60 | Head | — | Poland |
| 79 | Dora Lied | 30 | boarder | Typist | Poland |
| 80 | John Sicek | 53 | Head | Electrician | 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)