MM
Mary Mclean — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Madison-County, Illinois
Our Model Tree links this Mary Mclean across the 1920, 1930 and 1940 US Censuses in Madison-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1884), then head of a 3-person household.
Age 56
b. ~1884
Female
Head
Born: Illinois
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Madison-County, Illinois |
| Surname | McLean |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 56 |
| Marital Status | Widowed |
| Birthplace | Illinois |
| 1935 Residence (City) | Granite City |
| 1935 Residence (County) | Madison |
| Additional Details | |
| Highest Grade | G 8 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Granite City |
| Est. Birth Year | ~1884 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Kathryn Mclean | Daughter | — | 26 | ~1914 |
| Mary Mclean | Head | — | 56 | ~1884 |
| James Mclean | Son | — | 31 | ~1909 |
Census Appearances
1920
Madison, Illinois
Spouse, age 36
Madison, Illinois · implied b. ~1884 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McLean |
| Given Name | Mary E. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 36 |
| Marital Status | Married |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Madison, Illinois
Spouse, age 46
Madison, Illinois · implied b. ~1884 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McLean |
| Given Name | Mary E |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 46 |
| Marital Status | Married |
| Birthplace | Illinois |
| Age at First Marriage | 23 |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Madison-County, Illinois
Head, age 56
Madison-County, Illinois · implied b. ~1884 — 3 household members
| Surname | McLean |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 56 |
| Marital Status | Widowed |
| Birthplace | Illinois |
| 1935 Residence (City) | Granite City |
| 1935 Residence (County) | Madison |
| Highest Grade | G 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 Mclean across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Mclean
Head · 1940 · age 56 · b. ~1884 · 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 — Madison-County, Illinois
Open full size
1940 US Federal Census — Madison-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00850-00140)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Elbert Cotter | 48 | Head | — | Illinois |
| 2 | Irma Cotter | 44 | Wife | — | Illinois |
| 3 | Melvin J. Cotter | 13 | Son | — | Illinois |
| 4 | Wayne R. Cotter | 4 | Son | — | Illinois |
| 5 | Mary Mclean THIS PERSON | 56 | Head | — | Illinois |
| 6 | James Mclean | 31 | Son | Storage | Illinois |
| 7 | Kathryn Mclean | 26 | Daughter | Operator | Illinois |
| 8 | Bertha Skinner | 32 | Head | Packer | Illinois |
| 9 | Lois Skinner | 12 | Daughter | — | Missouri |
| 10 | Shirley Skinner | 11 | Daughter | — | Michigan |
| 11 | Alphonse Krenschek | 44 | Head | Foreman | Illinois |
| 12 | Flora Krenschek | 44 | Wife | — | Missouri |
| 13 | Lois Krenschek | 25 | Daughter | Clerk | Illinois |
| 14 | Arline Krenschek | 15 | Daughter | — | Illinois |
| 15 | Augusta Meghing | 66 | Head | — | Missouri |
| 16 | Robert Meghing | 20 | Son | — | Missouri |
| 17 | Fred Meghing | 35 | Head | Machinist | Missouri |
| 18 | Bertha O. Meghing | 36 | Wife | Operator | Missouri |
| 19 | Clyde Wilson | 29 | Head | — | Missouri |
| 20 | Doris Wilson | 25 | Wife | — | Illinois |
| 21 | Donald Wilson | 6 | Son | — | Missouri |
| 22 | Grant Wilson | 29 | Brother | — | Missouri |
| 23 | Elmer Grady | 25 | Head | Laborer | Missouri |
| 24 | Annabelle Grady | 24 | Wife | — | Missouri |
| 25 | Teddy L. Grady | 5 | Son | — | Missouri |
| 26 | Robert Dodd | 16 | Boarder | New Walker | Missouri |
| 27 | Frank Varton | 25 | Head | Clerk | Illinois |
| 28 | Alice Varton | 20 | Wife | Dipper | Illinois |
| 29 | — | None | — | — | — |
| 30 | Ed Johnson | 71 | Head | Detective | Illinois |
| 31 | Elizabeth Johnson | 68 | Wife | — | Illinois |
| 32 | Golda Walker | 54 | Lodger | Teacher | Illinois |
| 33 | W. H. Moss | 69 | Head | — | Illinois |
| 34 | Katie Moss | 68 | Wife | — | Illinois |
| 35 | Geraldine Moss | 21 | Daughter | — | Illinois |
| 36 | Harry F. Moss | 26 | Son | Salesman | Illinois |
| 37 | Earl W. Miller | 43 | Head | Chemist | Kansas |
| 38 | Geneve Miller | 38 | Wife | — | Illinois |
| 39 | Shirley M. Miller | 15 | Daughter | — | Illinois |
| 40 | Earl W. Jr. Miller | 8 | Son | — | 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)