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Mary Harmon — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Harmon across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a spouse (b.~1911), then head of a 7-person household.
Age 29
b. ~1911
Female
Spouse
Born: Mississippi
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Harmon |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | Black |
| Age | 29 |
| Marital Status | Married |
| Birthplace | Mississippi |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth State | Mississippi |
| Birth Country | United States |
| Birthplace (normalized) | mississippi |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1911 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Sarah Harmon | Daughter | — | 14 | ~1926 |
| Louis Harmon | Head | — | 32 | ~1908 |
| Lloyd Harmon | Son | — | ~1940 | |
| Rubie Harmon | Son | — | 1 | ~1939 |
| Louis Harmon | Son | — | 10 | ~1930 |
| Edward Harmon | Son | — | 2 | ~1938 |
| Mary Harmon | Spouse | — | 29 | ~1911 |
Census Appearances
1930
Cook, Illinois
Spouse, age 22
Cook, Illinois · implied b. ~1908 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Harmon |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | Black |
| Age | 22 |
| Marital Status | Married |
| Birthplace | Mississippi |
| Age at First Marriage | 18 |
| Father's Birthplace | Mississippi |
| Mother's Birthplace | Mississippi |
| Can Read/Write | Yes |
| Birth State | Mississippi |
| Birth Country | United States |
| Birthplace (normalized) | mississippi |
1940
Cook-County, Illinois
Spouse, age 29
Cook-County, Illinois · implied b. ~1911 — 7 household members
| Surname | Harmon |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | Black |
| Age | 29 |
| Marital Status | Married |
| Birthplace | Mississippi |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Class of Worker | 0 |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth State | Mississippi |
| Birth Country | United States |
| Birthplace (normalized) | mississippi |
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 Harmon across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Harmon
Spouse · 1940 · age 29 · b. ~1911 · 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-t0627-00925-00279)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Anna Corth | 23 | Wife | — | Arkansas |
| 2 | Theodore Corth | 2 | Son | — | Illinois |
| 3 | James Mcneal | 50 | Head | Washer | Mississippi |
| 4 | Burnee Mcneal | 34 | Wife | — | Arkansas |
| 5 | Chester Mcneal | 21 | Son | Kitchen Helper | Missouri |
| 6 | Johnnie Mcneal | 20 | Son | Porter | Missouri |
| 7 | Maggie Linton | 39 | Lodger | Seamstress | Arkansas |
| 8 | John Linton | 48 | Lodger | New Worker | Arkansas |
| 9 | Carrie Anderson | 38 | Head | — | Mississippi |
| 10 | James B Anderson | 20 | Son | — | Arkansas |
| 11 | Eddie B Anderson | 18 | Son | — | Arkansas |
| 12 | Marie H Anderson | 8 | Daughter | — | Illinois |
| 13 | Annie M Anderson | 6 | Daughter | — | Illinois |
| 14 | Donald Anderson | 4 | Son | — | Illinois |
| 15 | Minnie Manuel | 34 | Head | — | Oklahoma |
| 16 | Goldie Manuel | 3 | Daughter | — | Arkansas |
| 17 | Edmund Arnold | 20 | Head | Bus Boy | Georgia |
| 18 | Willie Vincent | 22 | Head | Car Washer | Arkansas |
| 19 | Magnolia Vincent | 20 | Wife | — | Arkansas |
| 20 | Robert Lee Vincent | 3 | Son | — | Arkansas |
| 21 | Willie B Vincent | 0 | Son | — | Illinois |
| 22 | Mercy Vincent | 18 | Sister | — | Arkansas |
| 23 | Geraldine Johnson | 2 | Niece | — | Illinois |
| 24 | Charles Hawkins | 59 | Head | Laborer | Missouri |
| 25 | James Murphy | 66 | Lodger | — | Missouri |
| 26 | Louis Harmon | 32 | Head | Laborer | Mississippi |
| 27 | Mary Harmon THIS PERSON | 29 | Wife | — | Mississippi |
| 28 | Sarah Harmon | 14 | Daughter | — | Mississippi |
| 29 | Louis Jr Harmon | 10 | Son | — | Illinois |
| 30 | Edward Harmon | 2 | Son | — | Illinois |
| 31 | Lloyd Harmon | 0 | Son | — | Illinois |
| 32 | Rubie Harmon | 1 | Son | — | Illinois |
| 33 | Emma Spears | 29 | Head | Maid | Kentucky |
| 34 | Rowena Spears | 45 | Sister-in-law | — | Kentucky |
| 35 | Sylvester Duncan | 32 | Head | Mechanic | Oklahoma |
| 36 | Gertie Duncan | 20 | Wife | — | Mississippi |
| 37 | Aurestia Duncan | 3 | Daughter | — | Illinois |
| 38 | Blossie Yoakum | 26 | Head | Laundress | Mississippi |
| 39 | Gwendolyn Yoakum | 7 | Daughter | — | Illinois |
| 40 | Opal Hill | 35 | Head | Press Operator | Alabama |
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)