MD
Mary Decker — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Salt-Lake-County, Utah
Our Model Tree links this Mary Decker across the 1930 and 1940 US Censuses in Salt-Lake-County, Utah (XGBoost, ~Confirmed) — first a daughter (b.~1922), then head of a 8-person household.
Age 18
b. ~1922
Female
Daughter
Born: Utah
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Salt-Lake-County, Utah |
| Surname | Decker |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Utah |
| 1935 Residence (City) | Salt Lake City |
| 1935 Residence (County) | Salt Lake |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | C 2 |
| 1935 Residence | Same Place |
| Birth State | Utah |
| Birth Country | United States |
| Birthplace (normalized) | utah |
| Township / Ward | Salt Lake City |
| Est. Birth Year | ~1922 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Marjorie Decker | Daughter | — | 5 | ~1935 |
| Rhoda Muir | Other | — | 30 | ~1910 |
| Ashby Decker | Son | — | 6 | ~1934 |
| Herbert Decker | Son | — | 14 | ~1926 |
| Mary Decker | Daughter | — | 18 | ~1922 |
| Wayne Decker | Head | — | 47 | ~1893 |
| Evallyn Decker | Spouse | — | 46 | ~1894 |
| Jack Decker | Son | — | 22 | ~1918 |
Census Appearances
1930
Salt Lake, …
Daughter, age 8
Salt Lake, Utah · implied b. ~1922 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Decker |
| Given Name | Mary Dorothy |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Utah |
| Father's Birthplace | Utah |
| Mother's Birthplace | Utah |
| Can Read/Write | Yes |
| Birth State | Utah |
| Birth Country | United States |
| Birthplace (normalized) | utah |
1940
Salt-Lake-County, Utah
Daughter, age 18
Salt-Lake-County, Utah · implied b. ~1922 — 8 household members
| Surname | Decker |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Utah |
| 1935 Residence (City) | Salt Lake City |
| 1935 Residence (County) | Salt Lake |
| Income (1939) | 0 |
| Highest Grade | C 2 |
| 1935 Residence | Same Place |
| Birth State | Utah |
| Birth Country | United States |
| Birthplace (normalized) | utah |
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 18 · b. ~1922 · Utah
★ You are viewing this record
Sibling
Herbert Decker
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jack Decker
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ashby Decker
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marjorie Decker
Sibling · 1940 · age 5
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 — Salt-Lake-County, Utah
Open full size
1940 US Federal Census — Salt-Lake-County, Utah
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-04226-00598)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Adiel Bleyhl | 24 | Son | Advertising Dept | Utah |
| 42 | Frank Snow | 85 | Head | — | Utah |
| 43 | Olive Williams | 45 | Daughter | — | Utah |
| 44 | Rachel Kingsbury | 52 | Daughter | — | Utah |
| 45 | Vern Halliday | 51 | Head | Auditor | Utah |
| 46 | Marguerite Halliday | 49 | Wife | — | Utah |
| 47 | Ruth Halliday | 20 | Daughter | Bookkeeper | Utah |
| 48 | Ivy Kowallis | 20 | Boarder | Bookkeeper | Utah |
| 49 | Arthur L. Smith | 52 | Head | Salesman | California |
| 50 | Gertrude Smith | 50 | Wife | — | Utah |
| 51 | Rehan Smith | 25 | Daughter | Employment Supervisor | Canada |
| 52 | Franklin Smith | 27 | Head | Service Dept | Canada |
| 53 | Geraldine Smith | 26 | Wife | Operator | Utah |
| 54 | Robert Sims | 24 | Head | Foreman | Utah |
| 55 | Evelyn Sims | 23 | Wife | — | Utah |
| 56 | George A. Sims | 60 | Head | Manager | Utah |
| 57 | Nell B. Sims | 59 | Wife | — | Utah |
| 58 | Valentine Snow | 60 | Head | Mining | Utah |
| 59 | Kate R. Snow | 58 | Wife | — | Utah |
| 60 | Louise Snow | 21 | Daughter | Office Girl | Utah |
| 61 | Martha H. Snow | 60 | Head | Saleslady | Utah |
| 62 | Lucy Durant | 26 | Daughter | Operator | Utah |
| 63 | Harvey Durant | 29 | Son-in-law | Bookkeeper | Idaho |
| 64 | Leon Higginbotham | 45 | Head | Accountant | Utah |
| 65 | Ruth Higginbotham | 39 | Wife | — | Utah |
| 66 | Sue Lyn Higginbotham | 7 | Daughter | — | Utah |
| 67 | Clarence Nelson | 45 | Head | Furniture M | Utah |
| 68 | Olive Nelson | 41 | Wife | — | Utah |
| 69 | Marjorie Nelson | 20 | Daughter | — | Utah |
| 70 | Shirley Nelson | 13 | Daughter | — | Utah |
| 71 | Patricia Nelson | 11 | Daughter | — | Utah |
| 72 | Mabel Evans | 40 | Maid | Maid | Utah |
| 73 | Wayne Decker | 47 | Head | Wholesale Jewelry | Utah |
| 74 | Evallyn Decker | 46 | Wife | — | Utah |
| 75 | Jack A. Decker | 22 | Son | Missionary | Utah |
| 76 | Mary Decker THIS PERSON | 18 | Daughter | — | Utah |
| 77 | Herbert W. Decker | 14 | Son | — | Utah |
| 78 | Ashby Decker | 6 | Son | — | Utah |
| 79 | Marjorie Ann Decker | 5 | Daughter | — | Utah |
| 80 | Rhoda Maid Muir | 30 | Maid | Maid | Utah |
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)