MC
Mary Carlson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Williams-County, North Dakota
Our Model Tree links this Mary Carlson across the 1930 and 1940 US Censuses in Williams-County, North Dakota (XGBoost, ~Confirmed) — first a daughter (b.~1930), then head of a 7-person household.
Age 10
b. ~1930
Female
Daughter
Born: North Dakota
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Williams-County, North Dakota |
| Surname | Carlson |
| Given Name | Mary C. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | North Dakota |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Williams |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | 5 |
| 1935 Residence | North Dakota |
| Birth State | North Dakota |
| Birth Country | United States |
| Birthplace (normalized) | north dakota |
| Township / Ward | Barrbutte |
| Est. Birth Year | ~1930 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Carlson | Daughter | — | 10 | ~1930 |
| Judith Carlson | Daughter | — | 11 | ~1929 |
| Palmer Carlson | Son | — | 15 | ~1925 |
| Martin Carlson | Head | — | 58 | ~1882 |
| Severin Carlson | Son | — | 16 | ~1924 |
| Clarence Carlson | Son | — | 22 | ~1918 |
| Martin Carlson | Son | — | 8 | ~1932 |
Census Appearances
1930
Williams, North …
Daughter, age 1
Williams, North Dakota · implied b. ~1929 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Carlson |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | North Dakota |
| Father's Birthplace | Norway |
| Mother's Birthplace | South Dakota |
| Birth State | North Dakota |
| Birth Country | United States |
| Birthplace (normalized) | north dakota |
1940
Williams-County, North …
Daughter, age 10
Williams-County, North Dakota · implied b. ~1930 — 7 household members
| Surname | Carlson |
| Given Name | Mary C. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | North Dakota |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Williams |
| Class of Worker | 0 |
| Highest Grade | 5 |
| 1935 Residence | North Dakota |
| Birth State | North Dakota |
| Birth Country | United States |
| Birthplace (normalized) | north dakota |
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 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Carlson
Daughter · 1940 · age 10 · b. ~1930 · North Dakota
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Sibling
Clarence Carlson
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Palmer Carlson
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Severin Carlson
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Judith Carlson
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Martin Carlson
Sibling · 1940 · age 8
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 — Williams-County, North Dakota
Open full size
1940 US Federal Census — Williams-County, North Dakota
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-03018-00421)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Michael D. Thoeny | 1 | Son | — | North Dakota |
| 42 | Chauncey D. Bill | 32 | Head | Farmer | Canada-English |
| 43 | Jens P. Lund | 58 | Head | Farmer | Denmark |
| 44 | Rena C. Lund | 51 | Wife | — | Denmark |
| 45 | Alvin J. Lund | 17 | Son | — | North Dakota |
| 46 | August F. O. Johnson | 54 | Head | Farmer | Wisconsin |
| 47 | Lillian M. Johnson | 31 | Daughter | House Work | North Dakota |
| 48 | Ruth L. Johnson | 16 | Daughter | — | North Dakota |
| 49 | Emil A. Johnson | 14 | Son | — | North Dakota |
| 51 | Martin Carlson | 58 | Head | Farmer | Norway |
| 52 | Clarence M. Carlson | 22 | Son | Laborer | North Dakota |
| 53 | Severin Carlson | 16 | Son | — | North Dakota |
| 54 | Palmer E. Carlson | 15 | Son | — | North Dakota |
| 55 | Judith M. Carlson | 11 | Daughter | — | North Dakota |
| 56 | Mary C. Carlson THIS PERSON | 10 | Daughter | — | North Dakota |
| 57 | Martin C. Carlson | 8 | Son | — | North Dakota |
| 58 | Victor Limstaugh | 28 | Head | Farmer | Ohio |
| 59 | Elmer Nelson | 38 | Head | Farmer | South Dakota |
| 60 | Caroline Nelson | 41 | Wife | — | South Dakota |
| 61 | Alvin Nelson | 21 | Son | Laborer | South Dakota |
| 62 | Harold Nelson | 15 | Son | — | North Dakota |
| 63 | Donald Nelson | 10 | Son | — | North Dakota |
| 64 | Clark D. Dopith | 72 | Head | Farmer | New York |
| 65 | Lawrence Clemitson | 39 | Head | Farmer | North Dakota |
| 66 | Ruth J. Clemitson | 37 | Wife | — | Indiana |
| 67 | Lyle L. Clemitson | 5 | Son | — | North Dakota |
| 68 | David L. Clemitson | 3 | Son | 0 | North Dakota |
| 69 | Nancy R. Clemitson | 2 | Daughter | 0 | North Dakota |
| 70 | Hans Fostel | 57 | Head | Operator | Norway |
| 71 | Andrew L. Moen | 56 | Head | Farmer | Minnesota |
| 72 | Euphemia C. Moen | 42 | Wife | Housework | Canada-English |
| 73 | Alden A. Moen | 20 | Son | — | North Dakota |
| 74 | Margaret Moen | 19 | Daughter | — | North Dakota |
| 75 | Frank H. Larson | 59 | Head | Farmer | Minnesota |
| 76 | Edna T. Larson | 55 | Wife | — | Iowa |
| 77 | Mabel I. Larson | 27 | Daughter | — | North Dakota |
| 78 | Joseph F. Larson | 22 | Son | Farmer | North Dakota |
| 79 | Frank L. Larson | 18 | Son | Farmer | North Dakota |
| 80 | Ruth M. Larson | 17 | Daughter | — | North Dakota |
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)