MC
Mary Carlson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Knox-County, Illinois
Our Model Tree links this Mary Carlson across the 1920, 1930 and 1940 US Censuses in Knox-County, Illinois (XGBoost, ~Confirmed), with identified parents August & Sophia — first a daughter (b.~1901), then head of a 3-person household.
Age 39
b. ~1901
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Knox-County, Illinois |
| Surname | Carlson |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 39 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Victoria Township |
| 1935 Residence (County) | Knox |
| Additional Details | |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Victoria Township |
| Est. Birth Year | ~1901 |
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 |
|---|---|---|---|---|
| Mary Carlson | Daughter | — | 39 | ~1901 |
| Mabel Carlson | Daughter | — | 56 | ~1884 |
| Sophia Carlson | Head | — | 77 | ~1863 |
Census Appearances
1920
Knox, Illinois
Daughter, age 19
Knox, Illinois · implied b. ~1901 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Carlson |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Illinois |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Knox, Illinois
Daughter, age 29
Knox, Illinois · implied b. ~1901 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Carlson |
| Given Name | Mary E |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 29 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Knox-County, Illinois
Daughter, age 39
Knox-County, Illinois · implied b. ~1901 — 3 household members
| Surname | Carlson |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 39 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Victoria Township |
| 1935 Residence (County) | Knox |
| 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 Mary Carlson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father August Carlson (~0.92 confidence) and mother Sophia Carlson (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
August Carlson
b. ~1857
Source father
● Household
· direct · ~0.92
Mother
Sophia Carlson
b. ~1862
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Carlson
Daughter · 1940 · age 39 · b. ~1901 · Illinois
★ You are viewing this record
Sibling
Mabel Carlson
Sibling · 1940 · age 56
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 — Knox-County, Illinois
Open full size
1940 US Federal Census — Knox-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00827-00415)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Leslie Fahnestrom | 24 | Lodger | Farmer | Minnesota |
| 42 | Samuel M. Collinson | 78 | Head | Retired | Illinois |
| 43 | Julia A. Collinson | 79 | Wife | — | Illinois |
| 44 | Louden Ely | 56 | Head | Farmer | Illinois |
| 45 | Goldie V. Ely | 44 | Wife | — | Illinois |
| 46 | Jeane Ely | 15 | Daughter | — | Illinois |
| 47 | Ruth Ely | 12 | Daughter | — | Illinois |
| 48 | Harvey Ely | 9 | Son | — | Illinois |
| 49 | Gerald P. Arwig | 30 | Head | Farmer | Iowa |
| 50 | Lucile Arwig | 28 | Wife | — | Illinois |
| 51 | Keith Arwig | 8 | Son | — | Illinois |
| 52 | Lester Arwig | 3 | Son | — | Illinois |
| 53 | George O. Carlson | 44 | Head | Farmer | Illinois |
| 54 | Susie Carlson | 42 | Wife | — | Illinois |
| 55 | Claridon Carlson | 9 | Son | — | Illinois |
| 56 | Sophia Carlson | 77 | Head | — | Illinois |
| 57 | Mabel Carlson | 56 | Daughter | — | Illinois |
| 58 | Mary Carlson THIS PERSON | 39 | Daughter | — | Illinois |
| 59 | Akina Johnson | 71 | Head | — | Illinois |
| 60 | Matilda Johnson | 67 | Wife | — | Illinois |
| 61 | Ethel Mae Johnson | 28 | Daughter | Teacher | Illinois |
| 62 | Harold P. Elliott | 45 | Head | Farmer | Illinois |
| 63 | Nellie Elliott | 44 | Wife | — | Illinois |
| 64 | Enid Elliott | 18 | Daughter | — | Illinois |
| 65 | Jean Elliott | 16 | Daughter | — | Illinois |
| 66 | Audrey Elliott | 13 | Daughter | — | Illinois |
| 67 | Esther Elliott | 8 | Daughter | — | Illinois |
| 68 | Everett Yelm | 45 | Head | Laborer | Illinois |
| 69 | Vida Yelm | 30 | Wife | — | Illinois |
| 70 | Betty Lou Yelm | 14 | Daughter | — | Illinois |
| 71 | Rolland Dean Yelm | 13 | Son | — | Illinois |
| 72 | Everett Dean Yelm | 11 | Son | — | Illinois |
| 73 | Merland Levern Yelm | 9 | Son | — | Illinois |
| 74 | Mamy Marie Yelm | 7 | Daughter | — | Illinois |
| 75 | Earl Duane Yelm | 5 | Son | — | Illinois |
| 76 | Ada Fay Yelm | 3 | Daughter | — | Illinois |
| 77 | Wallace R. Ellburg | 33 | Head | Farmer | Illinois |
| 78 | Pluma Ellburg | 40 | Sister | — | Illinois |
| 79 | Lester P. Johnson | 33 | Head | Farmer | Illinois |
| 80 | Thelma Johnson | 30 | Wife | — | Illinois |
Pedigree Summary
Mary + 1 sibling
Gen 1 · 2 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)