MC
Margaret Cooper — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Olmsted-County, Minnesota
Our Model Tree links this Margaret Cooper across the 1930 and 1940 US Censuses in Olmsted-County, Minnesota (XGBoost, ~Confirmed) — first a daughter (b.~1927), then head of a 10-person household.
Age 13
b. ~1927
Female
Daughter
Born: Minnesota
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Olmsted-County, Minnesota |
| Surname | Cooper |
| Given Name | Margaret |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Minnesota |
| 1935 Residence (City) | Rochester |
| 1935 Residence (County) | Olmsted |
| Additional Details | |
| Highest Grade | S 8 |
| 1935 Residence | Same Place |
| Birth State | Minnesota |
| Birth Country | United States |
| Birthplace (normalized) | minnesota |
| Township / Ward | Rochester |
| Est. Birth Year | ~1927 |
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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Margaret | Age | Birth yr |
|---|---|---|---|---|
| Clara Clappier | Daughter | — | 30 | ~1910 |
| Rose Cooper | Daughter | — | 22 | ~1918 |
| Herbert Cooper | Head | — | 56 | ~1884 |
| John Cooper | Son | — | 15 | ~1925 |
| Frances Cooper | Daughter | — | 19 | ~1921 |
| David Clappier | Other | — | 9 | ~1931 |
| Margaret Cooper | Daughter | — | 13 | ~1927 |
| Margaret Cooper | Spouse | — | 55 | ~1885 |
| William Cooper | Son | — | 21 | ~1919 |
| Dennis Clappier | Other | — | 8 | ~1932 |
Census Appearances
1930
Olmsted, Minnesota
Daughter, age 3
Olmsted, Minnesota · implied b. ~1927 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cooper |
| Given Name | Margaret M |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Minnesota |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Canada-English |
| Birth State | Minnesota |
| Birth Country | United States |
| Birthplace (normalized) | minnesota |
1940
Olmsted-County, Minnesota
Daughter, age 13
Olmsted-County, Minnesota · implied b. ~1927 — 10 household members
| Surname | Cooper |
| Given Name | Margaret |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Minnesota |
| 1935 Residence (City) | Rochester |
| 1935 Residence (County) | Olmsted |
| Highest Grade | S 8 |
| 1935 Residence | Same Place |
| Birth State | Minnesota |
| Birth Country | United States |
| Birthplace (normalized) | minnesota |
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 Margaret Cooper across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Margaret Cooper
Daughter · 1940 · age 13 · b. ~1927 · Minnesota
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Sibling
Clara Clappier
Sibling · 1940 · age 30
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rose Cooper
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Cooper
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frances Cooper
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Cooper
Sibling · 1940 · age 21
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 — Olmsted-County, Minnesota
Open full size
1940 US Federal Census — Olmsted-County, Minnesota
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01944-00539)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Herbert C Cooper | 56 | Head | Barber | Iowa |
| 2 | Margaret A Cooper | 55 | Wife | — | Canada |
| 3 | Clara Clappier | 30 | daughter | Manager | Iowa |
| 4 | David Clappier | 9 | grandson | — | Wisconsin |
| 5 | Dennis Clappier | 8 | grandson | — | Wisconsin |
| 6 | Rose Mary Cooper | 22 | daughter | Editorial Dept | Iowa |
| 7 | William Cooper | 21 | son | — | Iowa |
| 8 | Frances Cooper | 19 | daughter | Bookkeeper | Iowa |
| 9 | John Cooper | 15 | son | — | Minnesota |
| 10 | Margaret Cooper THIS PERSON | 13 | daughter | — | Minnesota |
| 11 | Lura S La Van | 47 | Head | Agent | Minnesota |
| 12 | Margaret Hickey | 44 | Lodger | Teacher | Illinois |
| 13 | Grace E Payne | 48 | Lodger | Saleslady | Minnesota |
| 14 | Fred M Duell | 58 | Head | Lodging House | Poland |
| 15 | Dorothy Duell | 24 | daughter | New Worker | Minnesota |
| 16 | Evelyn Duell | 30 | daughter | Secretary | Minnesota |
| 17 | Milton Hardtke | 20 | Lodger | Truck Driver | Wisconsin |
| 18 | Herman Lopse | 78 | Lodger | Owner | Germany |
| 19 | Nora Igoss | 22 | Lodger | Saleslady | Montana |
| 20 | Ben Igoss | 25 | Lodger | Bartender | Montana |
| 21 | Anna Lissman | 44 | Lodger | — | Iowa |
| 22 | Dagna Christenson | 50 | Lodger | Teacher | Minnesota |
| 23 | Helen Quish | 43 | Lodger | Teacher | Minnesota |
| 24 | Merice Keegan | 29 | Lodger | Trained Nurse | Nebraska |
| 25 | Nanette Coffin | 27 | Lodger | Trained Nurse | Minnesota |
| 26 | Mary Aldeen | 51 | Head | Practical | Minnesota |
| 27 | Dean Aldeen | 14 | son | — | Minnesota |
| 28 | Donald Campbell | 31 | Head | Med Doctor | Nebraska |
| 29 | Helen Campbell | 30 | wife | — | Nebraska |
| 30 | Robert Campbell | 5 | son | — | Nebraska |
| 31 | James D Campbell | 1 | son | — | Minnesota |
| 32 | Alex Murray | 41 | Head | Trucking Salesman | Minnesota |
| 33 | Rose Murray | 39 | wife | — | Minnesota |
| 34 | Elizabeth Murray | 20 | daughter | New Worker | Minnesota |
| 35 | Dan Murray | 19 | son | — | Minnesota |
| 36 | Robert Murray | 11 | son | — | Minnesota |
| 37 | Mary Murray | 8 | daughter | Laborer | Minnesota |
| 38 | Henry Helmholz | 57 | Head | Med Doctor | Illinois |
| 39 | Isabel G Helmholz | 54 | Wife | — | Wisconsin |
| 40 | Louise Fielder | 42 | servant | Maid | Minnesota |
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)