MC
Mary Campbell — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Campbell across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a spouse (b.~1887), then head of a 8-person household.
Age 53
b. ~1887
Female
Spouse
Born: Ireland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Campbell |
| Given Name | Mary |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 53 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Additional Details | |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
| Township / Ward | Chicago |
| Est. Birth Year | ~1887 |
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 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Cecelia Zimmer | Daughter | — | 5 | ~1935 |
| Mary Zimmer | Daughter | — | 27 | ~1913 |
| Mary Zimmer | Daughter | — | 1 | ~1939 |
| George Campbell | Head | — | 61 | ~1879 |
| Alice Dixon | Other | — | 19 | ~1921 |
| John Hynes | Other | — | 40 | ~1900 |
| Ernest Zimmer | Other | — | 29 | ~1911 |
| Mary Campbell | Spouse | — | 53 | ~1887 |
Census Appearances
1920
Cook, Illinois
Spouse, age 35
Cook, Illinois · implied b. ~1885 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Campbell |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 35 |
| Marital Status | Married |
| Birthplace | Ireland |
| Year of Immigration | 1917 |
| Naturalization Status | Alien |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Irish |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1930
Cook, Illinois
Spouse, age 46
Cook, Illinois · implied b. ~1884 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Campbell |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 46 |
| Marital Status | Married |
| Birthplace | Ireland |
| Naturalization Status | First papers filed |
| Year of Immigration | 1923 |
| Age at First Marriage | 21 |
| 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
Spouse, age 53
Cook-County, Illinois · implied b. ~1887 — 8 household members
| Surname | Campbell |
| Given Name | Mary |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 53 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Highest Grade | No 8 |
| 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 Campbell across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Campbell
Spouse · 1940 · age 53 · b. ~1887 · Illinois
★ You are viewing this record
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-t0627-00971-00281)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Morris Cohen | 45 | head | Advertising | New York |
| 2 | Gertrude Cohen | 46 | wife | — | Illinois |
| 3 | Marjorie Cohen | 18 | daughter | — | Indiana |
| 4 | Vivian Hegelund | 22 | daughter | — | Ohio |
| 5 | Annie Sherrod | 83 | head | — | Wisconsin |
| 6 | David Kelly | 44 | head | Steel Worker | Illinois |
| 7 | Mary Kelly | 42 | wife | — | Canada |
| 8 | Colleen Kelly | 14 | daughter | — | California |
| 9 | Joseph Kelly | 8 | son | — | Illinois |
| 10 | Katherine Dunn | 63 | head | Dressmaker | Wisconsin |
| 11 | August Dunn | 35 | son | Laborer | Illinois |
| 12 | Mabella Dunn | 38 | daughter | — | Illinois |
| 13 | Iver Dunn | 43 | son | Watchman | Michigan |
| 14 | Frank Pecina | 68 | head | Tailor | Bohemia |
| 15 | Salvatore Battaglia | 54 | head | Park Attendant | Italy |
| 16 | Carmella Battaglia | 58 | wife | — | Italy |
| 17 | Marie Vitello | 20 | daughter | — | Illinois |
| 18 | Albert Vitello | 18 | son | Mess Worker | Illinois |
| 19 | Claude Hopp | 55 | head | Street Car Conductor | Tennessee |
| 20 | Clara Hopp | 57 | wife | — | Illinois |
| 21 | Uriel Travelstead | 32 | head | Barber | Illinois |
| 22 | Deloris Travelstead | 22 | wife | — | Wisconsin |
| 23 | Beverly Travelstead | 4 | daughter | — | Illinois |
| 24 | Frank Smith | 50 | head | Dishwasher | Tennessee |
| 25 | Ada Smith | 50 | wife | — | Missouri |
| 26 | Charles Summers | 70 | head | — | Italy |
| 27 | Rose Summers | 71 | wife | — | Italy |
| 28 | George Campbell | 61 | head | Blacksmith | Ireland |
| 29 | Mary Campbell THIS PERSON | 53 | wife | — | Ireland |
| 30 | Ernest Zimmer | 29 | son in law | Metal Grinder | Pennsylvania |
| 31 | Mary A Zimmer | 27 | daughter | — | Scotland |
| 32 | Cecelia Zimmer | 5 | daughter | — | Illinois |
| 33 | Mary Zimmer | 1 | daughter | — | Illinois |
| 34 | Alice Dixon | 19 | lodger | — | Illinois |
| 35 | John Hynes | 40 | lodger | Auto Mechanic | Illinois |
| 36 | Patrick Hagdon | 32 | head | Cashier | Ireland |
| 37 | Josephine Hagdon | 29 | wife | — | Ireland |
| 38 | Patricia Hagdon | 2 | daughter | — | Illinois |
| 39 | John Summers | 37 | head | Laborer | Illinois |
| 40 | Clara Summers | 35 | wife | — | 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)