MD
Mary Decker — 1940 US Census Record
Linked across censuses1940 United States Federal Census · St.-Louis-City-County, Missouri
Our Model Tree links this Mary Decker across the 1920, 1930 and 1940 US Censuses in St.-Louis-City-County, Missouri (XGBoost, ~Confirmed) — first a spouse (b.~1875), then head of a 4-person household.
Age 65
b. ~1875
Female
Spouse
Born: Missouri
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | St.-Louis-City-County, Missouri |
| Surname | Decker |
| Given Name | Mary A. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 65 |
| Marital Status | Married |
| Birthplace | Missouri |
| 1935 Residence (City) | St. Louis |
| 1935 Residence (County) | St. Louis |
| Additional Details | |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
| Township / Ward | St Louis |
| Est. Birth Year | ~1875 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| John Garrison | Other | — | 55 | ~1885 |
| Myrtle Decker | Daughter | — | 41 | ~1899 |
| Mary Decker | Spouse | — | 65 | ~1875 |
| Chas Decker | Head | — | 67 | ~1873 |
Census Appearances
1920
St Louis, …
Head, age 45
St Louis, Missouri · implied b. ~1875
●
Primary link
· ~Confirmed · 1 source
XGBoost
| Surname | Ducker |
| Given Name | Mattie |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | Black |
| Age | 45 |
| Marital Status | Widowed |
| Birthplace | Missouri |
| Father's Birthplace | Missouri |
| Mother's Birthplace | Virginia |
| Occupation | Laundress |
| Industry | Private family |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | R |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
1930
St Louis, …
Head, age 55
St Louis, Missouri · implied b. ~1875 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Decker |
| Given Name | Margaret |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 55 |
| Marital Status | Widowed |
| Birthplace | Missouri |
| Age at First Marriage | 21 |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 30 |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
1940
St.-Louis-City-County, Missouri
Spouse, age 65
St.-Louis-City-County, Missouri · implied b. ~1875 — 4 household members
| Surname | Decker |
| Given Name | Mary A. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 65 |
| Marital Status | Married |
| Birthplace | Missouri |
| 1935 Residence (City) | St. Louis |
| 1935 Residence (County) | St. Louis |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
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 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Decker
Spouse · 1940 · age 65 · b. ~1875 · Missouri
★ 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 — St.-Louis-City-County, Missouri
Open full size
1940 US Federal Census — St.-Louis-City-County, Missouri
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02191-00716)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Gloria R. Webber | 12 | Daughter | — | Missouri |
| 42 | William Robert Webber | 14 | Son | — | Missouri |
| 43 | J. T. Newell | 66 | Head | Secretary | Missouri |
| 44 | May E. Newell | 33 | Daughter | Teacher | Missouri |
| 45 | James P. Newell | 32 | Son | — | Missouri |
| 46 | Adolph Schmiedeke | 64 | Head | Machinist | Illinois |
| 47 | Katie Schmiedeke | 60 | Wife | — | Illinois |
| 48 | Harry J. Schmiedeke | 34 | Son | Machine Helper | Missouri |
| 49 | Roy C. Graves | 35 | Head | Chemist | Illinois |
| 50 | Ruth M. Graves | 38 | Wife | — | Illinois |
| 51 | Royce Louis Graves | 6 | Daughter | — | Illinois |
| 52 | Elaine Marie Graves | 4 | Daughter | — | Illinois |
| 53 | Fred E. Gierich | 64 | Head | Insurance Agent | Missouri |
| 54 | Augusta D. Gierich | 53 | Wife | — | Missouri |
| 55 | Carl H. Althuns | 20 | Son | Apprentice | Missouri |
| 56 | Robert V. Berger | 38 | Head | Furniture | Missouri |
| 57 | Corrine E. Berger | 35 | Wife | — | Missouri |
| 58 | Robert C. Berger | 15 | Son | — | Missouri |
| 59 | Warren G. Berger | 8 | Son | — | Missouri |
| 60 | Edwin J. Berger | 4 | Son | — | Missouri |
| 61 | Raymond F. Berger | 2 | Son | — | Missouri |
| 62 | Otto F. Brinkman | 34 | Head | Draftsman | Illinois |
| 63 | Veronica Brinkman | 34 | Wife | — | Missouri |
| 64 | Sophie Brinkman | 71 | Mother | — | Germany |
| 65 | Adolph F. Brinkman | 33 | Brother | Book-Keeper | Illinois |
| 66 | Chas. J. D. Decker | 67 | Head | Tax Collector | Missouri |
| 67 | Mary A. Decker THIS PERSON | 65 | Wife | — | Missouri |
| 68 | Myrtle M. Decker | 41 | Daughter | Clerk | Missouri |
| 69 | John J. Garrison | 55 | Nephew | Chauffeur | Missouri |
| 70 | M. E. Mella | 53 | Head | General Agent | Missouri |
| 71 | Clara D. Q. Mella | 49 | Wife | — | Missouri |
| 72 | William F. Jr. Mella | 15 | Son | — | Missouri |
| 73 | Bertha E. Zwicke | 69 | Mother-in-law | — | Missouri |
| 74 | Albert C. Petzold | 35 | Head | Meat Cutter | Missouri |
| 75 | Alice L. D. Petzold | 35 | Wife | — | Missouri |
| 76 | Jacqulin Petzold | 12 | Daughter | — | Missouri |
| 77 | Jerry L. Driscoll | 55 | Head | Pipe Fitter | Missouri |
| 78 | Edna D. Driscoll | 51 | Wife | — | Missouri |
| 79 | Martin Ameras | 47 | Head | Bench Hand | Missouri |
| 80 | Caroline D. Ameras | 38 | Wife | — | Missouri |
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)