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Mary Martinez — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Charles-Mix-County, South Dakota
Our Model Tree links this Mary Martinez across the 1930 and 1940 US Censuses in Charles-Mix-County, South Dakota (XGBoost, ~Confirmed) — first a spouse (b.~1901), then head of a 5-person household.
Age 39
b. ~1901
Female
Spouse
Born: South Dakota
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Charles-Mix-County, South Dakota |
| Surname | Martinez |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 39 |
| Marital Status | Married |
| Birthplace | South Dakota |
| 1935 Residence (City) | Isaac Lake Township |
| 1935 Residence (County) | Charles Mix |
| Additional Details | |
| Highest Grade | No 7 |
| 1935 Residence | Same house |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
| Township / Ward | Isaac Lake Township |
| Est. Birth Year | ~1901 |
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 |
|---|---|---|---|---|
| Paul Martinez | Head | — | 38 | ~1902 |
| Bernice Martinez | Daughter | — | 12 | ~1928 |
| Mary Martinez | Spouse | — | 39 | ~1901 |
| Donald Martinez | Son | — | 4 | ~1936 |
| Elmer Martinez | Son | — | 19 | ~1921 |
Census Appearances
1930
Charles Mix, …
Other, age 27
Charles Mix, South Dakota · implied b. ~1903 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Martinez |
| Given Name | Mary |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 27 |
| Marital Status | Married |
| Birthplace | South Dakota |
| Age at First Marriage | 23 |
| Father's Birthplace | South Dakota |
| Mother's Birthplace | South Dakota |
| Can Read/Write | Yes |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
1940
Charles-Mix-County, South …
Spouse, age 39
Charles-Mix-County, South Dakota · implied b. ~1901 — 5 household members
| Surname | Martinez |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 39 |
| Marital Status | Married |
| Birthplace | South Dakota |
| 1935 Residence (City) | Isaac Lake Township |
| 1935 Residence (County) | Charles Mix |
| Highest Grade | No 7 |
| 1935 Residence | Same house |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
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 Martinez across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Martinez
Spouse · 1940 · age 39 · b. ~1901 · South Dakota
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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 — Charles-Mix-County, South Dakota
Open full size
1940 US Federal Census — Charles-Mix-County, South Dakota
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03851-00093)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Gladys Larsen | 19 | Daughter | Teacher | South Dakota |
| 2 | George Pederson | 53 | Head | Farmer | South Dakota |
| 3 | Minnie Pederson | 56 | Wife | — | Norway |
| 4 | Helene Johannesson | 79 | Mother | — | Norway |
| 5 | Curry Nelson | 22 | Lodger | Laborer | South Dakota |
| 6 | Paul Wentland | 40 | Head | Farmer | Germany |
| 7 | Hanna Wentland | 37 | Wife | — | South Dakota |
| 8 | Mavis Wentland | 10 | Daughter | — | South Dakota |
| 9 | Alvin Wentland | 7 | Son | — | South Dakota |
| 10 | Alice Wentland | 5 | Daughter | — | South Dakota |
| 11 | Paul Jr. Wentland | 4 | Son | — | South Dakota |
| 12 | Rosemary Wentland | 3 | Daughter | — | South Dakota |
| 13 | George Wentland | 2 | Son | — | South Dakota |
| 14 | Harold Wentland | 1 | Son | — | South Dakota |
| 15 | Robert Wentland | 1 | Son | — | South Dakota |
| 16 | Walter Wentland | 1 | Son | — | South Dakota |
| 17 | Jerry Soulek | 29 | Head | Farmer | South Dakota |
| 18 | Lavina Soulek | 27 | Wife | — | South Dakota |
| 19 | Frank Sr. Kadlec | 77 | Head | — | Czechoslovakia |
| 20 | James Kadlec | 44 | Head | Farmer | South Dakota |
| 21 | Mayme Kadlec | 44 | Wife | — | South Dakota |
| 22 | Edward Kadlec | 17 | Son | — | South Dakota |
| 23 | Ray Kadlec | 16 | Son | — | South Dakota |
| 24 | Helen Kadlec | 14 | Daughter | — | South Dakota |
| 25 | Ruby Kadlec | 13 | Daughter | — | South Dakota |
| 26 | Leonard Kadlec | 12 | Son | — | South Dakota |
| 27 | Frank Kadlec | 39 | Head | Farmer | South Dakota |
| 28 | Rose Kadlec | 33 | Wife | — | South Dakota |
| 29 | Irene Kadlec | 13 | Daughter | — | South Dakota |
| 30 | Viola Kadlec | 11 | Daughter | — | South Dakota |
| 31 | Jo Anna Kadlec | 8 | Daughter | — | South Dakota |
| 32 | Paul Martinez | 38 | Head | Farmer | South Dakota |
| 33 | Mary Martinez THIS PERSON | 39 | Wife | — | South Dakota |
| 34 | Elmer Martinez | 19 | Son | — | South Dakota |
| 35 | Bernice Martinez | 12 | Daughter | — | South Dakota |
| 36 | Donald Martinez | 4 | Son | — | South Dakota |
| 37 | James Cabalka | 30 | Head | Farmer | South Dakota |
| 38 | Paul Thucka | 40 | Head | Farmer | South Dakota |
| 39 | Veretta Thucka | 34 | Wife | — | Nebraska |
| 40 | Alberta Thucka | 12 | Daughter | — | South Dakota |
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)