MC
Mary Cooper — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Kent-County, Delaware
Our Model Tree links this Mary Cooper across the 1920, 1930 and 1940 US Censuses in Kent-County, Delaware (XGBoost, ~Confirmed) — first a spouse (b.~1894), then head of a 5-person household.
Age 46
b. ~1894
Female
Spouse
Born: Delaware
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Kent-County, Delaware |
| Surname | Cooper |
| Given Name | Mary M. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 46 |
| Marital Status | Married |
| Birthplace | Delaware |
| 1935 Residence (City) | 9th Dist |
| 1935 Residence (County) | Kent |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | H-4 |
| 1935 Residence | Same Place |
| Birth State | Delaware |
| Birth Country | United States |
| Birthplace (normalized) | delaware |
| Township / Ward | 9Th Dist |
| Est. Birth Year | ~1894 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Cooper | Daughter | — | 18 | ~1922 |
| Harlan Cooper | Son | — | 21 | ~1919 |
| John Cooper | Son | — | 4 | ~1936 |
| J Cooper | Son | — | 15 | ~1925 |
| Mary Cooper | Spouse | — | 46 | ~1894 |
Census Appearances
1920
Kent, Delaware
Spouse, age 26
Kent, Delaware · implied b. ~1894 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cooper |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 26 |
| Marital Status | Married |
| Birthplace | Delaware |
| Father's Birthplace | Delaware |
| Mother's Birthplace | Delaware |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Delaware |
| Birth Country | United States |
| Birthplace (normalized) | delaware |
1930
Kent, Delaware
Spouse, age 36
Kent, Delaware · implied b. ~1894 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cooper |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 36 |
| Marital Status | Married |
| Birthplace | Delaware |
| Age at First Marriage | 20 |
| Father's Birthplace | Delaware |
| Mother's Birthplace | Pennsylvania |
| Can Read/Write | Yes |
| Birth State | Delaware |
| Birth Country | United States |
| Birthplace (normalized) | delaware |
1940
Kent-County, Delaware
Spouse, age 46
Kent-County, Delaware · implied b. ~1894 — 5 household members
| Surname | Cooper |
| Given Name | Mary M. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 46 |
| Marital Status | Married |
| Birthplace | Delaware |
| 1935 Residence (City) | 9th Dist |
| 1935 Residence (County) | Kent |
| Income (1939) | 0 |
| Highest Grade | H-4 |
| 1935 Residence | Same Place |
| Birth State | Delaware |
| Birth Country | United States |
| Birthplace (normalized) | delaware |
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 Cooper across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Cooper
Spouse · 1940 · age 46 · b. ~1894 · Delaware
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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 — Kent-County, Delaware
Open full size
1940 US Federal Census — Kent-County, Delaware
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00544-00862)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Mary M. Cooper THIS PERSON | 46 | Wife | — | Delaware |
| 42 | Harlan H. Cooper | 21 | Son | Machine Operator | Delaware |
| 43 | Mary E. Cooper | 18 | Daughter | — | Delaware |
| 44 | J. Miller Cooper | 15 | Son | — | Delaware |
| 45 | John Wayne Cooper | 4 | Son | — | Delaware |
| 46 | Charles Draper | 39 | Head | Farmer | Maryland |
| 47 | Josephine Draper | 34 | Wife | — | Ohio |
| 48 | Robert Draper | 15 | Son | — | Maryland |
| 49 | Pauline Draper | 13 | Daughter | — | Maryland |
| 50 | James Pearson | 62 | Hired Hand | Hired Help | Delaware |
| 51 | Elwood Shultie | 38 | Head | Truck Driver | Maryland |
| 52 | Marie Shultie | 36 | Wife | Operator | Pennsylvania |
| 53 | Doris Shultie | 12 | Daughter | — | Delaware |
| 54 | Elwood Shultie | 9 | Son | — | New Jersey |
| 55 | Robert Shultie | 7 | Son | — | Delaware |
| 56 | Richard Shultie | 5 | Son | — | Delaware |
| 57 | Leanne Shultie | 2 | Daughter | — | Delaware |
| 58 | Dora Fish | 43 | Head | Manager | Russia |
| 59 | Emma Fish | 21 | Daughter | Clerical | Pennsylvania |
| 60 | John Holloway | 30 | Head | Outside Man | Delaware |
| 61 | Marguerite Holloway | 25 | Wife | Clerk | Delaware |
| 62 | Helman J. Minner | 30 | Head | Manager | Delaware |
| 63 | Mildred Minner | 29 | Wife | Bookkeeper | Delaware |
| 64 | Mildred A. Minner | 5 | Daughter | — | Delaware |
| 65 | Jonathen J. Minner | 3 | Son | — | Delaware |
| 66 | Clarence Billings | 39 | Head | Farmer | Delaware |
| 67 | Edith D. Billings | 39 | Wife | — | West Virginia |
| 68 | Herschel Billings | 22 | Son | Service Man | Delaware |
| 69 | Ralph Billings | 16 | Son | Helper | Delaware |
| 70 | Jr. Clarence Billings | 12 | Son | — | Delaware |
| 71 | Audrey Billings | 6 | Daughter | — | Delaware |
| 72 | Ralph Hanson | 19 | Son-in-law | Service Man | Delaware |
| 73 | Thelma Hanson | 19 | Daughter | Seamstress | Delaware |
| 74 | George N. O. Graves | 59 | Head | Farmer | Virginia |
| 75 | Martha Graves | 65 | Wife | — | Delaware |
| 76 | Ida Lair | 13 | Granddaughter | — | Delaware |
| 77 | Clifford Vincent | 11 | Foster Child | — | Delaware |
| 78 | Marie Korbel | 61 | Head | — | Czechoslovakia |
| 79 | Mary J. Korbel | 39 | Daughter | 60 | New York |
| 80 | Frank O. Kotlaba | 38 | Head | 60 | New Jersey |
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)