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Mary Leach — 1940 US Census Record
Linked across censuses1940 United States Federal Census · New-Castle-County, Delaware
Our Model Tree links this Mary Leach across the 1930 and 1940 US Censuses in New-Castle-County, Delaware (XGBoost, ~Confirmed) — first a spouse (b.~1882), then head of a 5-person household.
Age 58
b. ~1882
Female
Spouse
Born: Delaware
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | New-Castle-County, Delaware |
| Surname | Leach |
| Given Name | Mary A. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 58 |
| Marital Status | Married |
| Birthplace | Delaware |
| 1935 Residence (City) | Wilmington City |
| 1935 Residence (County) | New Castle |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same Place |
| Birth State | Delaware |
| Birth Country | United States |
| Birthplace (normalized) | delaware |
| Township / Ward | Wilmington City |
| Est. Birth Year | ~1882 |
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 |
|---|---|---|---|---|
| Charles Leach | Head | — | 58 | ~1882 |
| Bayard Leach | Son | — | 10 | ~1930 |
| Mary Leach | Spouse | — | 58 | ~1882 |
| Ann Jones | Daughter | — | 42 | ~1898 |
| Virginia Leach | Daughter | — | 20 | ~1920 |
Census Appearances
1930
New Castle, …
Spouse, age 45
New Castle, Delaware · implied b. ~1885 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Leach |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 45 |
| Marital Status | Married |
| Birthplace | Delaware |
| Age at First Marriage | 15 |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Can Read/Write | Yes |
| Birth State | Delaware |
| Birth Country | United States |
| Birthplace (normalized) | delaware |
1940
New-Castle-County, Delaware
Spouse, age 58
New-Castle-County, Delaware · implied b. ~1882 — 5 household members
| Surname | Leach |
| Given Name | Mary A. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 58 |
| Marital Status | Married |
| Birthplace | Delaware |
| 1935 Residence (City) | Wilmington City |
| 1935 Residence (County) | New Castle |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 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 Leach across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Leach
Spouse · 1940 · age 58 · b. ~1882 · 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 — New-Castle-County, Delaware
Open full size
1940 US Federal Census — New-Castle-County, Delaware
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-00549-00634)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Hugh Deery | 18 | Head | Printer | Delaware |
| 2 | Agnes Deery | 16 | Daughter | — | Delaware |
| 3 | Charles W. Leach | 58 | Head | Fireman | Delaware |
| 4 | Mary A. Leach THIS PERSON | 58 | Wife | — | Delaware |
| 5 | Virginia M. Leach | 20 | Daughter | Saleslady | Delaware |
| 6 | Bayard Leach | 10 | Son | — | Delaware |
| 7 | Ann Jones | 42 | Daughter | Saleslady | Delaware |
| 9 | Frank Jones | 28 | Head | Truck Driver | Delaware |
| 10 | Angie Jones | 26 | Wife | — | Delaware |
| 11 | Chris Jones | 39 | Brother | Truck Driver | Delaware |
| 12 | Harry Jones | 70 | Father | — | Delaware |
| 13 | Paul Nake | 60 | Head | Cutler | Germany |
| 14 | Lena Nake | 59 | Wife | — | Germany |
| 15 | Helmut Nake | 23 | Son | Sheet Metal Worker | Germany |
| 16 | Frank B. Colton | 54 | Head | Machinist | Delaware |
| 17 | Alice Colton | 54 | Wife | — | Maryland |
| 18 | Ruth Colton | 27 | Daughter | — | Delaware |
| 19 | Joseph Colton | 16 | Son | — | Delaware |
| 20 | Helen Roberson | 26 | Daughter | Packer | Delaware |
| 21 | Charles M. Lane | 37 | Head | Meter Reader | Delaware |
| 22 | Mary E. Lane | 34 | Wife | — | Delaware |
| 23 | Charles T. Lane | 11 | Son | — | Delaware |
| 24 | Rose Mary Lane | 1 | Daughter | — | Delaware |
| 25 | Harold Simpson | 41 | Head | Custodian | England |
| 26 | Edith Simpson | 40 | Wife | — | England |
| 27 | Ronald Simpson | 20 | Son | — | England |
| 28 | Vernon Simpson | 18 | Son | Apprentice Printer | Delaware |
| 29 | Eleanor Simpson | 15 | Daughter | — | Delaware |
| 30 | Doreen Simpson | 4 | Daughter | — | Delaware |
| 31 | Patricia Ann Simpson | 0 | Daughter | — | Delaware |
| 32 | Frances Wilkinson | 23 | Lodger | Waitress | Delaware |
| 33 | Frederick C. Jackson | 30 | Head | Stationary Fireman | Delaware |
| 34 | Marion T. Jackson | 33 | Wife | — | Delaware |
| 35 | Frederick C. Jr. Jackson | 1 | Son | — | Delaware |
| 36 | Harry Truax | 63 | Head | Watchman | Delaware |
| 37 | Ella Truax | 44 | Wife | — | Delaware |
| 38 | Charles H. Gorry | 71 | Head | — | Delaware |
| 39 | Addie E. Gorry | 68 | Wife | — | Maryland |
| 40 | George H. Martin | 69 | Head | Research Work | Pennsylvania |
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)