MD
Mary Decker — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Baltimore-City-County, Maryland
Our Model Tree links this Mary Decker across the 1930 and 1940 US Censuses in Baltimore-City-County, Maryland (XGBoost, ~Confirmed) — first a daughter (b.~1929), then head of a 6-person household.
Age 11
b. ~1929
Female
Daughter
Born: Maryland
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Baltimore-City-County, Maryland |
| Surname | Decker |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore |
| 1935 Residence (County) | Baltimore City |
| Additional Details | |
| Highest Grade | No 4 |
| 1935 Residence | Maryland |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Baltimore City |
| Est. Birth Year | ~1929 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Albert Decker | Head | — | 34 | ~1906 |
| Eleanor Decker | Daughter | — | ~1940 | |
| Janet Decker | Daughter | — | 8 | ~1932 |
| Shirley Decker | Daughter | — | 3 | ~1937 |
| Catherine Decker | Spouse | — | 29 | ~1911 |
| Mary Decker | Daughter | — | 11 | ~1929 |
Census Appearances
1930
Baltimore, Maryland
Other, age 1
Baltimore, Maryland · implied b. ~1929 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Decker |
| Given Name | Mary |
| Relationship to Head | Niece |
| Sex | F |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Baltimore-City-County, Maryland
Daughter, age 11
Baltimore-City-County, Maryland · implied b. ~1929 — 6 household members
| Surname | Decker |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore |
| 1935 Residence (County) | Baltimore City |
| Highest Grade | No 4 |
| 1935 Residence | Maryland |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
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 Decker across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Decker
Daughter · 1940 · age 11 · b. ~1929 · Maryland
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Sibling
Eleanor Decker
Sibling · 1940 · age
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Janet Decker
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Shirley Decker
Sibling · 1940 · age 3
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 — Baltimore-City-County, Maryland
Open full size
1940 US Federal Census — Baltimore-City-County, Maryland
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-01531-00443)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Annie B Gambler | 24 | Wife | — | Maryland |
| 2 | Patricia Gambler | 3 | Daughter | — | Maryland |
| 3 | Paul Gambler | 1 | Son | — | Maryland |
| 5 | Alexander Beck | 56 | Head | Machinist | Maryland |
| 6 | Emma S. Beck | 52 | Wife | — | Virginia |
| 7 | Allen Beck | 31 | Son | Truck Driver | Maryland |
| 8 | Ethyl Beck | 29 | Daughter-in-law | — | Maryland |
| 9 | Ruth Beck | 9 | Granddaughter | — | Maryland |
| 10 | Doris Beck | 6 | Granddaughter | — | Maryland |
| 11 | Jean Beck | 4 | Granddaughter | — | Maryland |
| 12 | Peter Weaver | 71 | Head | Railroad | Maryland |
| 13 | Sarah Weaver | 68 | Wife | — | Maryland |
| 14 | Rose Meyer | 64 | Sister-in-law | — | Maryland |
| 15 | William Geary | 57 | Head | Routeman | Maryland |
| 16 | Catherine Geary | 51 | Wife | — | Maryland |
| 17 | James Griffin | 48 | Lodger | Chauffeur | Maryland |
| 18 | Daniel Scullin | 47 | Head | Painter | Maryland |
| 19 | Catherine Scullin | 45 | Wife | — | Maryland |
| 20 | Margaret Tucker | 23 | Daughter | — | Maryland |
| 21 | Bernhard Tucker | 23 | Son-in-law | Painter Helper | Maryland |
| 22 | George Scullin | 22 | Son | Painter Helper | Maryland |
| 23 | Elizabeth Scullin | 13 | Daughter | — | Maryland |
| 24 | Catherine Keatler | 68 | Mother-in-law | — | Maryland |
| 25 | Max Drechsler | 29 | Head | Automobile Mechanic | Germany |
| 26 | Theresa Drechsler | 31 | Wife | — | Maryland |
| 27 | Goldie Ashtman | 36 | Head | — | Maryland |
| 28 | John Ashtman | 16 | Son | — | Maryland |
| 29 | Walter Ashtman | 12 | Son | — | Maryland |
| 30 | Betty Ashtman | 9 | Daughter | — | Maryland |
| 31 | William Ashtman | 7 | Son | — | Maryland |
| 32 | Joan Ashtman | 5 | Daughter | — | Maryland |
| 33 | Eugene Ashtman | 3 | Son | — | Maryland |
| 34 | Deloris Ashtman | 14 | Daughter | — | Maryland |
| 35 | Albert Decker | 34 | Head | Laborer | Maryland |
| 36 | Catherine Decker | 29 | Wife | — | Maryland |
| 37 | Mary Decker THIS PERSON | 11 | Daughter | — | Maryland |
| 38 | Janet Decker | 8 | Daughter | — | Maryland |
| 39 | Shirley Decker | 3 | Daughter | — | Maryland |
| 40 | Eleanor Decker | 0 | Daughter | — | Maryland |
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)