MJ
Mamie Johnson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mamie Johnson across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Mary — first a daughter (b.~1888), then head of a 5-person household.
Age 52
b. ~1888
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Johnson |
| Given Name | Mamie |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 52 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | City - Chicago |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Highest Grade | No 8 |
| 1935 Residence | Same house |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | City Chicago |
| Est. Birth Year | ~1888 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mamie | Age | Birth yr |
|---|---|---|---|---|
| Olive Johnson | Daughter | — | 44 | ~1896 |
| Mamie Johnson | Daughter | — | 52 | ~1888 |
| Winnetta Johnson | Daughter | — | 51 | ~1889 |
| Mary Johnson | Head | — | 22 | ~1918 |
| Marshall Johnson | Son | — | 42 | ~1898 |
Census Appearances
1920
Cook, Illinois
Spouse, age 31
Cook, Illinois · implied b. ~1889 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Mamie |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | Illinois |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Spouse, age 41
Cook, Illinois · implied b. ~1889 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Mamie E. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 41 |
| Marital Status | Married |
| Birthplace | Illinois |
| Age at First Marriage | 33 |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Ohio |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 52
Cook-County, Illinois · implied b. ~1888 — 5 household members
| Surname | Johnson |
| Given Name | Mamie |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 52 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | City - Chicago |
| 1935 Residence (County) | Cook |
| Highest Grade | No 8 |
| 1935 Residence | Same house |
| 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 Mamie Johnson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Mary Johnson (~0.50 confidence). The pedigree spans 1 generation with 1 identified ancestor.
Show:
Gen 1
Parents
confidence ≈ 0.5
Mother
Mary Johnson
b. ~1918
Source mother
● Household
· direct · ~0.5
This person
Anchor record
Mamie Johnson
Daughter · 1940 · age 52 · b. ~1888 · Illinois
★ You are viewing this record
Sibling
Marshall Johnson
Sibling · 1940 · age 42
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Winnetta Johnson
Sibling · 1940 · age 51
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Olive Johnson
Sibling · 1940 · age 44
Source co-child of head (derived)
● Co-child · derived · ~0.88
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-t0627-00987-00640)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Ida Nordin | 58 | Head | Charwoman | Illinois |
| 42 | Robert Nordin | 19 | Brother | Office Boy | Illinois |
| 43 | Mary Johnson | 22 | Head | — | Norway |
| 44 | Mamie Johnson THIS PERSON | 52 | Daughter | — | Illinois |
| 45 | Winnetta Johnson | 51 | Daughter | — | Illinois |
| 46 | Olive Johnson | 44 | Daughter | Stenographer | Illinois |
| 47 | Marshall Johnson | 42 | Son | Fishing Guide | Illinois |
| 48 | Julius Fuchs | 54 | Head | Supervisor Painter | Hungary |
| 49 | Caroline Fuchs | 51 | Wife | — | Hungary |
| 50 | Julius Jr. Fuchs | 27 | Son | Assembler | Illinois |
| 51 | Alfred Fuchs | 24 | Son | Assembler | Illinois |
| 52 | Karoline Fuchs | 16 | Daughter | — | Illinois |
| 53 | Kenneth Fuchs | 6 | Grandson | — | Illinois |
| 54 | Julius Iii Fuchs | 3 | Grandson | — | Illinois |
| 55 | Minnie Baska | 40 | Lodger | Proofreader | Illinois |
| 56 | Richard Lundquist | 32 | Head | Tool Maker | Illinois |
| 57 | Evelyn Lundquist | 25 | Wife | Storekeeper | Illinois |
| 58 | Ronald Lundquist | 4 | Son | — | Illinois |
| 59 | George Segelman | 23 | Head | Stock Clerk | Illinois |
| 60 | Susanna Segelman | 22 | Wife | — | Illinois |
| 61 | Ronald Segelman | 1 | Son | — | Illinois |
| 62 | Paul Habik | 25 | Brother-in-law | Clerk | Illinois |
| 63 | Joseph Czernoski | 56 | Head | Proprietor | Poland |
| 64 | Josephine Czernoski | 56 | Wife | — | Poland |
| 65 | Stanley Cern | 23 | Son | Sales Clerk | Illinois |
| 66 | Anna Wodzin | 29 | Daughter | Seamstress | Illinois |
| 67 | Irvin Wodzin | 11 | Grandson | — | Illinois |
| 68 | Albert Olen | 42 | Head | Engineer | Michigan |
| 69 | Sophie Olen | 41 | Wife | — | Michigan |
| 70 | Harold Olen | 18 | Son | — | Illinois |
| 71 | Robert Olen | 15 | Son | — | Illinois |
| 72 | Margaret Olen | 9 | Daughter | — | Illinois |
| 73 | Thomas Russo | 24 | Head | Service Man | Michigan |
| 74 | Phyllis Russo | 23 | Wife | — | Illinois |
| 75 | Thomas Jr. Russo | 2 | Son | — | Illinois |
| 76 | Vincent Edzikowski | 66 | Father-in-law | — | Poland |
| 77 | Mary Edzikowski | 50 | Mother-in-law | — | Poland |
| 78 | Max Mielski | 46 | Head | Floor Man | Poland |
| 79 | Natalie Mielski | 45 | Wife | Butcher | Poland |
| 80 | Olga Mielski | 23 | Daughter | Bookkeeper | Illinois |
Pedigree Summary
Mamie + 3 siblings
Gen 1 · 1 parents
~0.5
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)