MH
Mary Harmon — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Sussex-County, Delaware
Our Model Tree links this Mary Harmon across the 1930 and 1940 US Censuses in Sussex-County, Delaware (XGBoost, ~Confirmed) — first a daughter (b.~1926), then head of a 9-person household.
Age 14
b. ~1926
Female
Daughter
Born: Delaware
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Sussex-County, Delaware |
| Surname | Harmon |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Delaware |
| 1935 Residence (City) | Representative District No 10 |
| 1935 Residence (County) | Sussex |
| Additional Details | |
| Highest Grade | No 7 |
| 1935 Residence | Same House |
| Birth State | Delaware |
| Birth Country | United States |
| Birthplace (normalized) | delaware |
| Township / Ward | Representative District No 10 |
| Est. Birth Year | ~1926 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Blanche Harmon | Daughter | — | 9 | ~1931 |
| Mary Harmon | Daughter | — | 14 | ~1926 |
| Adelia Harmon | Daughter | — | 5 | ~1935 |
| Jennie Harmon | Daughter | — | 2 | ~1938 |
| Isaac Harmon | Head | — | 42 | ~1898 |
| Ernest Harmon | Son | — | 19 | ~1921 |
| Robert Harmon | Son | — | 12 | ~1928 |
| Leon Harmon | Son | — | 17 | ~1923 |
| Christine Harmon | Spouse | — | 35 | ~1905 |
Census Appearances
1930
Sussex, Delaware
Daughter, age 4
Sussex, Delaware · implied b. ~1926 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Harmon |
| Given Name | Mary V. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Delaware |
| Father's Birthplace | Delaware |
| Mother's Birthplace | Delaware |
| Birth State | Delaware |
| Birth Country | United States |
| Birthplace (normalized) | delaware |
1940
Sussex-County, Delaware
Daughter, age 14
Sussex-County, Delaware · implied b. ~1926 — 9 household members
| Surname | Harmon |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Delaware |
| 1935 Residence (City) | Representative District No 10 |
| 1935 Residence (County) | Sussex |
| Highest Grade | No 7 |
| 1935 Residence | Same House |
| 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 Harmon across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Harmon
Daughter · 1940 · age 14 · b. ~1926 · Delaware
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Sibling
Jennie Harmon
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Blanche Harmon
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Adelia Harmon
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Leon Harmon
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ernest Harmon
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Harmon
Sibling · 1940 · age 12
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 — Sussex-County, Delaware
Open full size
1940 US Federal Census — Sussex-County, Delaware
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00548-00376)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Fred Benton | 93 | Father | — | Delaware |
| 42 | Head Lester | None | M | Farm | — |
| 43 | Alice Lester | 29 | Wife | — | Delaware |
| 44 | Leon Lester | 11 | Son | — | Delaware |
| 45 | James F. Lester | 3 | Son | — | Delaware |
| 46 | Arthur Wilson | 72 | Head | Farmer | Delaware |
| 47 | Olive Wilson | 63 | Wife | — | Delaware |
| 48 | Jacob G. Ruth | 37 | Lodger | Farmer | Pennsylvania |
| 49 | Leon Ellingsworth | 63 | Head | Farmer | Delaware |
| 50 | Jane Ellingsworth | 53 | Wife | — | Maryland |
| 51 | Othee Ellingsworth | 20 | Daughter | — | Delaware |
| 52 | Martin Ellingsworth | 17 | Son | Farmer | Delaware |
| 53 | Jane Ellingsworth | 14 | Daughter | — | Delaware |
| 54 | William Hitchins | 22 | Head | Farmer | Delaware |
| 55 | Anna Hitchins | 20 | Wife | — | Delaware |
| 56 | John S. Hitchins | 58 | Head | Farmer | Delaware |
| 57 | Ella Hitchins | 16 | Wife | — | Delaware |
| 58 | Viola Hitchins | 3 | Daughter | — | Delaware |
| 59 | Edward Hitchins | 19 | Son | Farmer | Delaware |
| 60 | Anthony B. Higgins | 34 | Head | Writer | Delaware |
| 61 | Catherine Higgins | 30 | Wife | — | Maryland |
| 62 | Anthony Jr. Higgins | 2 | Son | — | Delaware |
| 63 | William S. Wright | 63 | Head | Farmer | Delaware |
| 64 | Return Wright | 30 | Son | Farmer | Delaware |
| 65 | C. Frank Ellingsworth | 34 | Head | Farmer | Delaware |
| 66 | Martha Ellingsworth | 42 | Wife | — | Delaware |
| 67 | Alvin L. Joseph | 79 | Head | — | Delaware |
| 68 | John R. Hitchins | 27 | Head | Farmer | Delaware |
| 69 | Jennie V. Hitchins | 20 | Wife | — | Delaware |
| 70 | Isaac Harmon | 42 | Head | Farmer | Delaware |
| 71 | Christine Harmon | 35 | Wife | — | Delaware |
| 72 | Ernest Harmon | 19 | Son | Farmer | Delaware |
| 73 | Leon Harmon | 17 | Son | Farmer | Delaware |
| 74 | Mary Harmon THIS PERSON | 14 | Daughter | — | Delaware |
| 75 | Robert Harmon | 12 | Son | — | Delaware |
| 76 | Blanche Harmon | 9 | Daughter | — | Delaware |
| 77 | Adelia Harmon | 5 | Daughter | — | Delaware |
| 78 | Jennie Harmon | 2 | Daughter | — | Delaware |
| 79 | Lenora Maesy | 54 | Head | — | Delaware |
| 80 | Preston Maesy | 25 | Son | Gasoline Station | Delaware |
Related Census Records
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)