MJ
Mary Jefferson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · New-Castle-County, Delaware
Our Model Tree links this Mary Jefferson across the 1920, 1930 and 1940 US Censuses in New-Castle-County, Delaware (XGBoost, ~Confirmed) — first a head (b.~1888), then head of a 7-person household.
Age 52
b. ~1888
Female
Head
Born: Delaware
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | New-Castle-County, Delaware |
| Surname | Jefferson |
| Given Name | Mary E. |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 52 |
| Marital Status | Widowed |
| Birthplace | Delaware |
| 1935 Residence (City) | Wilmington City |
| 1935 Residence (County) | New Castle |
| Additional Details | |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Delaware |
| Birth Country | United States |
| Birthplace (normalized) | delaware |
| Township / Ward | Wilmington City |
| Est. Birth Year | ~1888 |
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 |
|---|---|---|---|---|
| Joseph Jefferson | Son | — | 25 | ~1915 |
| Mary Jefferson | Head | — | 52 | ~1888 |
| Sadie Walles | Other | — | 33 | ~1907 |
| Arthur Jefferson | Son | — | 18 | ~1922 |
| Randolph Jefferson | Son | — | 14 | ~1926 |
| Catherine Jefferson | Daughter | — | 16 | ~1924 |
| Richard Walles | Other | — | 41 | ~1899 |
Census Appearances
1920
New Castle, …
Spouse, age 31
New Castle, Delaware · implied b. ~1889 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jefferson |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | Black |
| Age | 31 |
| Marital Status | Married |
| Birthplace | Delaware |
| Father's Birthplace | Delaware |
| Mother's Birthplace | Delaware |
| Occupation | Laborer |
| Industry | Sugar Store |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Delaware |
| Birth Country | United States |
| Birthplace (normalized) | delaware |
1930
New Castle, …
Spouse, age 42
New Castle, Delaware · implied b. ~1888 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jefferson |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 42 |
| Marital Status | Married |
| Birthplace | Delaware |
| Age at First Marriage | 22 |
| Father's Birthplace | Delaware |
| Mother's Birthplace | Delaware |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Delaware |
| Birth Country | United States |
| Birthplace (normalized) | delaware |
1940
New-Castle-County, Delaware
Head, age 52
New-Castle-County, Delaware · implied b. ~1888 — 7 household members
| Surname | Jefferson |
| Given Name | Mary E. |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 52 |
| Marital Status | Widowed |
| Birthplace | Delaware |
| 1935 Residence (City) | Wilmington City |
| 1935 Residence (County) | New Castle |
| Highest Grade | Hs 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 Jefferson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Jefferson
Head · 1940 · age 52 · b. ~1888 · Delaware
★ You are viewing this record
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
40 people indexed on this census page (nara:1940:m-t0627-00552-00513)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Wife Theresa | None | F | New Castle Leather | — |
| 2 | John Di Santis | 57 | Head | Laborer | Italy |
| 3 | Angela Di Santis | 52 | Wife | — | Italy |
| 4 | Joseph Di Santis | 32 | Son | Machine Oper. | Italy |
| 5 | Augustine Di Santis | 30 | Son | — | Italy |
| 6 | Samuel George | 27 | Son-in-law | Gardener | Penna |
| 7 | Ellen George | 25 | Daughter | — | Delaware |
| 8 | Samuel Jr. George | 1 | Grand-son | — | Delaware |
| 9 | Domino Ciabattoni | 43 | Head | Housework | Italy |
| 10 | Lucy Ciabattoni | 36 | Wife | — | Delaware |
| 11 | Jenny Ciabattoni | 15 | Daughter | — | Delaware |
| 12 | William Ciabattoni | 14 | Son | — | Delaware |
| 13 | Teresa Ciabattoni | 10 | Daughter | — | Delaware |
| 14 | Josephine Ciabattoni | 8 | Daughter | — | Delaware |
| 15 | Domino Jr. Ciabattoni | 7 | Son | — | Delaware |
| 16 | Elizabeth Ciabattoni | 5 | Daughter | — | Delaware |
| 17 | Emeido Stellina | 46 | Head | Truck Driver | Italy |
| 18 | Jenny Stellina | 42 | Wife | — | Italy |
| 19 | Lawrence Stellina | 15 | Son | — | Delaware |
| 20 | Franky Stellina | 12 | Son | — | Delaware |
| 21 | Nick Stellina | 10 | Son | — | Delaware |
| 22 | Emeido Jr. Stellina | 7 | Son | — | Delaware |
| 23 | John Mespeco | 50 | Head | Gardener | Italy |
| 24 | Josephine Mespeco | 55 | Wife | — | Italy |
| 25 | Dominick Petruccia | 52 | Lodger | Laborer | Italy |
| 26 | Mark Petruccia | 24 | Lodger | Laborer | Italy |
| 27 | Carmen Collicchio | 46 | Head | Laborer | Italy |
| 28 | Tanina Collicchio | 42 | Wife | — | Italy |
| 29 | Roy R. Marshall | 30 | Head | Janitor | Virginia |
| 30 | Willie J. Marshall | 27 | Wife | — | Virginia |
| 31 | Arvey J. Marshall | 8 | Daughter | — | Virginia |
| 32 | Otis Corbin | 24 | Lodger | Janitor | Virginia |
| 33 | Mary E. Jefferson THIS PERSON | 52 | Head | — | Delaware |
| 34 | Joseph H. Jefferson | 25 | Son | Laborer | Delaware |
| 35 | Randolph E. Jefferson | 14 | Son | — | Delaware |
| 36 | Arthur D. Jefferson | 18 | Son | Clerk | Delaware |
| 37 | Catherine A. Jefferson | 16 | Daughter | — | Delaware |
| 38 | Richard Walles | 41 | Lodger | Cook | North Carolina |
| 39 | Sadie Walles | 33 | Lodger | Cook | Tenn. |
| 40 | Joseph W. Porter | 57 | Head | — | Virginia |
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)