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Robert Johnston — 1940 US Census Record
Model Tree available1940 United States Federal Census · Mercer-County, Illinois
Our Model Tree links this Robert Johnston across the 1920, 1930 and 1940 US Censuses in Mercer-County, Illinois (XGBoost, ~Confirmed), with identified parents Margaret — first a head (b.~1880), then head of a 4-person household.
Age 60
b. ~1880
Male
Head
Born: Ohio
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Mercer-County, Illinois |
| Surname | Johnston |
| Given Name | Robert C |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 60 |
| Marital Status | Married |
| Birthplace | Ohio |
| 1935 Residence (City) | Aledo |
| 1935 Residence (County) | Mercer |
| Additional Details | |
| Occupation | proprietor-pharmacist |
| Industry | retail drugstore |
| Class of Worker | OA |
| Hours Worked | 50 |
| Income (1939) | 3070 |
| Highest Grade | C 5 |
| 1935 Residence | Same place |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
| Occupation | Proprietor-Pharmacist |
| Township / Ward | Aledo |
| Est. Birth Year | ~1880 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Robert | Age | Birth yr |
|---|---|---|---|---|
| Marilyn Johnston | Daughter | — | 14 | ~1926 |
| Robert Johnston | Head | — | 60 | ~1880 |
| Eunice Stevenson | Other | — | 46 | ~1894 |
| Bertha Johnston | Spouse | — | 57 | ~1883 |
Census Appearances
1920
Mercer, Illinois
Son, age 40
Mercer, Illinois · implied b. ~1880 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnston |
| Given Name | Robert C. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 40 |
| Marital Status | Single |
| Birthplace | Ohio |
| Year of Immigration | 1887 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Ohio |
| Occupation | Druggist |
| Industry | Own Store |
| Class of Worker | OA |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
1930
Mercer, Illinois
Head, age 50
Mercer, Illinois · implied b. ~1880 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnston |
| Given Name | Robert C. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 50 |
| Marital Status | Married |
| Birthplace | Ohio |
| Age at First Marriage | 40 |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Ohio |
| Occupation | Pharmacist |
| Industry | Retail drug store |
| Class of Worker | E |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 4000 |
| Radio Set | R |
| Veteran | No |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
1940
Mercer-County, Illinois
Head, age 60
Mercer-County, Illinois · implied b. ~1880 — 4 household members
| Surname | Johnston |
| Given Name | Robert C |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 60 |
| Marital Status | Married |
| Birthplace | Ohio |
| 1935 Residence (City) | Aledo |
| 1935 Residence (County) | Mercer |
| Occupation | proprietor-pharmacist |
| Industry | retail drugstore |
| Class of Worker | OA |
| Hours Worked | 50 |
| Income (1939) | 3070 |
| Highest Grade | C 5 |
| 1935 Residence | Same place |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
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 Robert Johnston across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Margaret Johnston (~0.92 confidence). The pedigree spans 1 generation with 1 identified ancestor.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Margaret Johnston
b. ~1843
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Robert Johnston
Head · 1940 · age 60 · b. ~1880 · 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 — Mercer-County, Illinois
Open full size
1940 US Federal Census — Mercer-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00858-00182)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Rebecca Vance | 76 | Head | — | Illinois |
| 42 | James H Vance | 48 | Son | Laborer | Illinois |
| 43 | Bernice Vance | 44 | Daughter-in-law | — | Illinois |
| 44 | Robert Lee Vance | 9 | Grandson | — | California |
| 45 | Ben Walters | 49 | Head | Salesman | Illinois |
| 46 | Sayda Walters | 43 | Wife | — | Finland |
| 47 | Hope Walters | 22 | Daughter | New Worker | Illinois |
| 48 | Doris Walters | 18 | Daughter | — | Iowa |
| 49 | Evelyn Walters | 12 | Daughter | — | Illinois |
| 50 | Robert C Johnston THIS PERSON | 60 | Head | Proprietor-Pharmacist | Ohio |
| 51 | Bertha Johnston | 57 | Wife | — | Illinois |
| 52 | Marilyn Johnston | 14 | Daughter | — | Illinois |
| 53 | Eunice Stevenson | 46 | Maid | Housework | Illinois |
| 54 | Milton L Mader | 47 | Head | Asst Supt | Illinois |
| 55 | Elsie Mader | 44 | Wife | Clerk | Illinois |
| 56 | Eugene Mader | 20 | Son | Clerk | Illinois |
| 57 | Dallas Mader | 15 | Son | — | Illinois |
| 58 | Charles W Nesbitt | 65 | Head | Proprietor | Pennsylvania |
| 59 | Bertha X Nesbitt | 65 | Wife | — | Illinois |
| 60 | Merle Nesbitt | 41 | Son | Mail Carrier | Illinois |
| 61 | Orpha G Van Meter | 82 | Head | — | Illinois |
| 62 | Blanche Miller | 59 | Daughter | — | Illinois |
| 63 | Oline Miller | 29 | Granddaughter | — | Illinois |
| 64 | Howard Riley | 40 | Head | Bulk Station Manager | Illinois |
| 65 | E. Mildred Riley | 36 | Wife | — | Illinois |
| 66 | Oline Shaw | 42 | Lodger | Proprietress | Illinois |
| 67 | George Acord | 25 | Head | Abstractor | Illinois |
| 68 | Lola Acord | 23 | Wife | — | Illinois |
| 69 | Lella Knickerbocker | 64 | Head | — | Illinois |
| 70 | Ruth Porter | 54 | Sister | — | Illinois |
| 71 | Elinor Porter | 25 | Niece | Clerical Work | Illinois |
| 72 | William Porter | 23 | Nephew | — | Illinois |
| 73 | Laura Campbell | 21 | Lodger | Stenographer | Michigan |
| 74 | Maurine Campbell | 18 | Lodger | — | California |
| 75 | Charles H Carlstrom | 33 | Head | Lawyer | Minnesota |
| 76 | Margaret Carlstrom | 27 | Wife | — | Illinois |
| 77 | David L Carlstrom | 4 | Son | — | Illinois |
| 78 | Mabel Conway | 55 | Head | — | Illinois |
| 79 | Clarence E Nordling | 42 | Head | Minister | Illinois |
| 80 | Mary Nordling | 35 | Wife | — | Illinois |
Pedigree Summary
Robert
Gen 1 · 1 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)