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Mary Mckenzie — 1940 US Census Record
Model Tree available1940 United States Federal Census · Johnson-County, Illinois
Our Model Tree links this Mary Mckenzie across the 1920, 1930 and 1940 US Censuses in Johnson-County, Illinois (XGBoost, ~Confirmed), with identified parents Adolphus & Ralph — first a daughter (b.~1903), then head of a 2-person household.
Age 37
b. ~1903
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Johnson-County, Illinois |
| Surname | McKenzie |
| Given Name | Mary B |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 37 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Vienna City |
| 1935 Residence (County) | Johnson |
| Additional Details | |
| Occupation | Teacher |
| Industry | Public School |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 680 |
| Highest Grade | C 2 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Teacher |
| Township / Ward | Vienna City |
| Est. Birth Year | ~1903 |
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.
2 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Mckenzie | Daughter | — | 37 | ~1903 |
| Alice Mckenzie | Head | — | 64 | ~1876 |
Census Appearances
1920
Johnson, Illinois
Daughter, age 17
Johnson, Illinois · implied b. ~1903 — 12 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McKenzie |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Ohio |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Johnson, Illinois
Daughter, age 27
Johnson, Illinois · implied b. ~1903 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McKenzie |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Ohio |
| Occupation | Teacher |
| Industry | School |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Johnson-County, Illinois
Daughter, age 37
Johnson-County, Illinois · implied b. ~1903 — 2 household members
| Surname | McKenzie |
| Given Name | Mary B |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 37 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Vienna City |
| 1935 Residence (County) | Johnson |
| Occupation | Teacher |
| Industry | Public School |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 680 |
| Highest Grade | C 2 |
| 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 Mckenzie across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Adolphus Mckenzie (~0.92 confidence) and father Ralph Mckenzie (~0.92 confidence) and mother Alice Mckenzie (~0.92 confidence) and mother Alice Mckenzie (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Adolphus Mckenzie
b. ~1872
Source father
● Household
· direct · ~0.92
Father
Ralph Mckenzie
b. ~1872
Source father
● Household
· direct · ~0.92
Mother
Alice Mckenzie
b. ~1877
Source mother
● Household
· direct · ~0.92
Mother
Alice Mckenzie
b. ~1879
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Mckenzie
Daughter · 1940 · age 37 · b. ~1903 · 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 — Johnson-County, Illinois
Open full size
1940 US Federal Census — Johnson-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00818-00274)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Lolita G Bellington | 7 | Daughter | — | Missouri |
| 42 | Glenn Morgan | 28 | Head | Laborer | Illinois |
| 43 | Mary Morgan | 26 | Wife | — | Illinois |
| 44 | Doris J Morgan | 5 | Daughter | — | Illinois |
| 45 | James E Mcraven | 44 | Head | Manager | Illinois |
| 46 | Mabel L Mcraven | 39 | Wife | — | Illinois |
| 47 | Virginia D Mcraven | 16 | Daughter | — | Illinois |
| 48 | James Wooldridge | 28 | Head | Janitor | Illinois |
| 49 | Bobbie Jones | 17 | Cousin | — | Illinois |
| 50 | Wallace Kelley | 17 | Nephew | — | Illinois |
| 51 | June Jordan | 12 | Niece | — | Illinois |
| 52 | Maggie Thomas | 50 | Head | — | Illinois |
| 53 | Alice M Thomas | 18 | daughter | — | Illinois |
| 54 | Wilma F Williams | 4 | daughter | — | Illinois |
| 55 | Alice Chain | 70 | Head | — | Illinois |
| 56 | Charles Norman | 53 | Head | Farmer | Mississippi |
| 57 | Mary Norman | 49 | Wife | — | Tennessee |
| 58 | Robert Wooldridge | 27 | Head | Laborer | Illinois |
| 59 | Rosetta Wooldridge | 25 | Wife | — | Arkansas |
| 60 | Dorothy L Wooldridge | 9 | daughter | — | Illinois |
| 61 | Robert E Wooldridge | 7 | son | — | Illinois |
| 62 | John H Wooldridge | 4 | son | — | Illinois |
| 63 | Alene Wooldridge | 1 | daughter | — | Illinois |
| 64 | Leo Casey | 32 | Head | Laborer | Illinois |
| 65 | Josephine Casey | 28 | Wife | — | Missouri |
| 66 | Patricia A Casey | 5 | daughter | — | Missouri |
| 67 | Margaret L Casey | 4 | daughter | — | Missouri |
| 68 | Loretta Casey | 2 | daughter | — | Missouri |
| 69 | Beatrice Jane | 33 | Head | General House Keeping | Illinois |
| 70 | Myra C Redden | 49 | Head | Nurse | Illinois |
| 71 | John H Redden | 22 | son | Manager | Illinois |
| 72 | Katherine Redden | 17 | daughter-in-law | — | Illinois |
| 73 | Herbert Mckenzie | 34 | Head | Manager | Illinois |
| 74 | Margaret E Mckenzie | 25 | Wife | Seamstress | Illinois |
| 75 | Mary L Mckenzie | 6 | daughter | — | Illinois |
| 76 | Alice M Mckenzie | 4 | daughter | — | Illinois |
| 77 | William H Mckenzie | 1 | son | — | Illinois |
| 78 | Rosa Nell Gourley | 20 | sister-in-law | General House Keeper | Illinois |
| 79 | Alice E Mckenzie | 64 | Head | — | Ohio |
| 80 | Mary B Mckenzie THIS PERSON | 37 | daughter | Teacher | Illinois |
Pedigree Summary
Mary
Gen 1 · 4 parents
~0.92
Max depth 4 (1900–1950 window)
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)