OJ
Olga Johnson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Olga Johnson across the 1910, 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a spouse (b.~1885), then head of a 5-person household.
Age 55
b. ~1885
Female
Spouse
Born: Finland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Johnson |
| Given Name | Olga |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 55 |
| Marital Status | Married |
| Birthplace | Finland |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Additional Details | |
| Industry | 0 |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth Country | Finland |
| Birthplace (normalized) | finland |
| Township / Ward | Chicago |
| Est. Birth Year | ~1885 |
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 Olga | Age | Birth yr |
|---|---|---|---|---|
| Alice Johnson | Daughter | — | 19 | ~1921 |
| Carl Johnson | Head | — | 56 | ~1884 |
| Olga Johnson | Spouse | — | 55 | ~1885 |
| Helen Johnson | Daughter | — | 9 | ~1931 |
| Berton Johnson | Son | — | 17 | ~1923 |
Census Appearances
1910
Essex, Massachusetts
Spouse, age 24
Essex, Massachusetts · implied b. ~1886 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Olga |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 24 |
| Marital Status | Married |
| Birthplace | Finland |
| Years Married | 4 |
| Children Born | 2 |
| Children Living | 2 |
| Year of Immigration | 1903 |
| Father's Birthplace | Finland |
| Mother's Birthplace | Finland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | English |
| Birth Country | Finland |
| Birthplace (normalized) | finland |
1920
Cook, Illinois
Spouse, age 35
Cook, Illinois · implied b. ~1885 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Olga |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 35 |
| Marital Status | Married |
| Birthplace | Finland |
| Year of Immigration | 1902 |
| Naturalization Status | Alien |
| Father's Birthplace | Finland |
| Mother's Birthplace | Finland |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Finnish |
| Birth Country | Finland |
| Birthplace (normalized) | finland |
1930
Cook, Illinois
Spouse, age 46
Cook, Illinois · implied b. ~1884 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Olga |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 46 |
| Marital Status | Married |
| Birthplace | Finland |
| Naturalization Status | Alien |
| Year of Immigration | 1913 |
| Age at First Marriage | 34 |
| Father's Birthplace | Finland |
| Mother's Birthplace | Finland |
| Can Read/Write | Yes |
| Mother Tongue | Swedish |
| Birth Country | Finland |
| Birthplace (normalized) | finland |
1940
Cook-County, Illinois
Spouse, age 55
Cook-County, Illinois · implied b. ~1885 — 5 household members
| Surname | Johnson |
| Given Name | Olga |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 55 |
| Marital Status | Married |
| Birthplace | Finland |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Industry | 0 |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth Country | Finland |
| Birthplace (normalized) | finland |
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 Olga Johnson across 4 US Census years (1910, 1920, 1930 and 1940) in 3 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Olga Johnson
Spouse · 1940 · age 55 · b. ~1885 · 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-t0627-01010-00839)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Donald F Hubler | 10 | Son | — | Illinois |
| 42 | Mary Maroney | 45 | Lodger | Table Worker | Massachusetts |
| 43 | Noreen Maroney | 10 | Cousin | — | Illinois |
| 44 | Herbert Belford | 40 | Lodger | — | Left Switzerland |
| 45 | Frank Wodak | 77 | Lodger | — | Norway |
| 46 | John Herman | 71 | Head | Night Watchman | Germany |
| 47 | Elizabeth Herman | 64 | Wife | — | Illinois |
| 48 | Elizabeth Daley | 55 | Head | — | Kansas |
| 49 | Olive Daley | 22 | Son | Printer | Illinois |
| 50 | Carl Johnson | 56 | Head | — | Sweden |
| 51 | Olga Johnson THIS PERSON | 55 | Wife | — | Finland |
| 52 | Alice Johnson | 19 | Daughter | — | Illinois |
| 53 | Berton Johnson | 17 | Son | — | Illinois |
| 54 | Helen Johnson | 9 | Daughter | — | Illinois |
| 55 | Helen Fuller | 43 | Head | Dressmaker | Missouri |
| 56 | Fred Schwartz | 35 | Head | Auto Driver | Germany |
| 57 | Helen Schwartz | 38 | Wife | — | Hungary |
| 58 | Fred Venne | 42 | Head | Maintenance | Kansas |
| 59 | Helen Venne | 29 | Wife | Clerk | Pennsylvania |
| 60 | Elizabeth Platt | 66 | Head | — | Illinois |
| 61 | Cora C Finn | 40 | Head | Maid | Illinois |
| 62 | Elizabeth Finn | 13 | Daughter | — | Illinois |
| 63 | Loretta Finn | 11 | Daughter | — | Illinois |
| 64 | James Finn | 9 | Son | — | Illinois |
| 65 | Mary B Finn | 66 | Head | — | Illinois |
| 66 | Morris Finn | 19 | Son | Laborer | Illinois |
| 67 | Ambrose Finn | 16 | Son | Office Clerk | Illinois |
| 68 | Mercedes Finn | 26 | Daughter | — | Illinois |
| 69 | Eugene Finn | 24 | Son | Printer | Illinois |
| 70 | Andrew Lock | 34 | Head | Machinist | Hungary |
| 71 | Helen Lock | 29 | Wife | Clerk | Illinois |
| 72 | Helen Lock | 11 | Daughter | — | Illinois |
| 73 | Robert Lock | 7 | Son | — | Illinois |
| 74 | Katherine Wagner | 60 | Mother-in-law | — | Hungary |
| 75 | Marguerite | 25 | Daughter | Stenographer | Illinois |
| 76 | Mary | 21 | Daughter | Stenographer | Illinois |
| 77 | Elmer M Feltes | 42 | Head | Clerk Sales | Illinois |
| 78 | Helen C Feltes | 40 | Wife | — | Illinois |
| 79 | Elmer Feltes | 4 | Son | — | Illinois |
| 80 | Louis Mayer | 27 | Head | Nite Manager | Hungary |
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)