MP
Mary Peterson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Salt-Lake-County, Utah
Our Model Tree links this Mary Peterson across the 1910, 1920, 1930 and 1940 US Censuses in Salt-Lake-County, Utah (XGBoost, ~Confirmed) — first a spouse (b.~1870), then head of a 4-person household.
Age 70
b. ~1870
Female
Spouse
Born: Utah
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Salt-Lake-County, Utah |
| Surname | Peterson |
| Given Name | Mary S. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 70 |
| Marital Status | Married |
| Birthplace | Utah |
| 1935 Residence (City) | Salt Lake City |
| 1935 Residence (County) | Salt Lake |
| Additional Details | |
| Industry | 0 |
| Highest Grade | C 4 |
| 1935 Residence | Same place |
| Birth State | Utah |
| Birth Country | United States |
| Birthplace (normalized) | utah |
| Township / Ward | Salt Lake City |
| Est. Birth Year | ~1870 |
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 |
|---|---|---|---|---|
| Mary Peterson | Daughter | — | 30 | ~1910 |
| Alfred Peterson | Head | — | 70 | ~1870 |
| Joseph Peterson | Son | — | 24 | ~1916 |
| Mary Peterson | Spouse | — | 70 | ~1870 |
Census Appearances
1910
Salt Lake, …
Spouse, age 40
Salt Lake, Utah · implied b. ~1870 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Peterson |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Utah |
| Years Married | 8 |
| Children Born | 3 |
| Children Living | 2 |
| Father's Birthplace | Missouri |
| Mother's Birthplace | Utah |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | English |
| Birth State | Utah |
| Birth Country | United States |
| Birthplace (normalized) | utah |
1920
Salt Lake, …
Spouse, age 49
Salt Lake, Utah · implied b. ~1871 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Peterson |
| Given Name | Mary S |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 49 |
| Marital Status | Married |
| Birthplace | Utah |
| Father's Birthplace | Missouri |
| Mother's Birthplace | Utah |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Utah |
| Birth Country | United States |
| Birthplace (normalized) | utah |
1930
Salt Lake, …
Spouse, age 60
Salt Lake, Utah · implied b. ~1870 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Peterson |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 60 |
| Marital Status | Married |
| Birthplace | Utah |
| Age at First Marriage | 30 |
| Father's Birthplace | Missouri |
| Mother's Birthplace | Utah |
| Can Read/Write | Yes |
| Birth State | Utah |
| Birth Country | United States |
| Birthplace (normalized) | utah |
1940
Salt-Lake-County, Utah
Spouse, age 70
Salt-Lake-County, Utah · implied b. ~1870 — 4 household members
| Surname | Peterson |
| Given Name | Mary S. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 70 |
| Marital Status | Married |
| Birthplace | Utah |
| 1935 Residence (City) | Salt Lake City |
| 1935 Residence (County) | Salt Lake |
| Industry | 0 |
| Highest Grade | C 4 |
| 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 Peterson across 4 US Census years (1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Peterson
Spouse · 1940 · age 70 · b. ~1870 · Utah
★ 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 — 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-t0627-04226-00195)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | George Groves | 40 | Head | Janitor | Utah |
| 2 | Thelma Groves | 34 | Wife | — | Utah |
| 3 | Nadine Groves | 12 | Daughter | — | Utah |
| 4 | Eugene Groves | 10 | Son | — | Utah |
| 5 | Dale Groves | 8 | Son | — | Utah |
| 6 | Beverly Groves | 6 | Daughter | — | Utah |
| 7 | Thomas Wright | 73 | Father-in-law | — | England |
| 8 | Nicia Caddell | 71 | Head | — | S. Carolina |
| 9 | William Johnson | 30 | Nephew | — | Utah |
| 10 | Ruth Johnson | 40 | Head | — | Utah |
| 11 | Charles Foster | 51 | Brother | — | Utah |
| 12 | James Hayes | 31 | Head | Supervisor | Idaho |
| 13 | Naomi Hayes | 27 | Wife | — | Washington |
| 14 | Naomi Hayes | 8 | Daughter | — | Utah |
| 15 | James Hayes | 7 | Son | — | Utah |
| 16 | Harry Hayes | 6 | Son | — | Utah |
| 17 | Kathleen Hayes | 2 | Daughter | — | Utah |
| 18 | Marilyn Hayes | 0 | Daughter | — | Utah |
| 19 | James Hutchison | 72 | Head | — | England |
| 20 | Flo Wilcox | 60 | Head | — | New York |
| 21 | Viola Wilcox | 29 | Daughter | — | Utah |
| 22 | Alfred Peterson | 70 | Head | Treasurer | Utah |
| 23 | Mary S. Peterson THIS PERSON | 70 | Wife | — | Utah |
| 24 | Mary Peterson | 30 | Daughter | Cashier | Utah |
| 25 | Joseph H. Peterson | 24 | Son | — | Utah |
| 26 | Reinhard Backer | 36 | Head | Manager | Germany |
| 27 | Ruby Backer | 28 | Wife | Saleswoman | Mexico |
| 28 | Gary Backer | 5 | Son | — | California |
| 29 | Martin Backer | 22 | Brother | Decorator | Germany |
| 30 | Kenneth Sharp | 30 | Head | Truck Driver | Nebraska |
| 31 | Ella Sharp | 28 | Wife | — | Idaho |
| 32 | Michael Sharp | 3 | Son | — | Idaho |
| 33 | Herbert Hess | 41 | Head | Stage Driver | Iowa |
| 34 | Alice Hess | 27 | Wife | — | Utah |
| 35 | Richard White | 41 | Head | Clerk | Utah |
| 36 | Ellora White | 40 | Wife | — | Utah |
| 37 | Dorothy White | 14 | Daughter | — | Utah |
| 38 | Darlene White | 14 | Daughter | — | Utah |
| 39 | Jeanette Mann | 53 | Head | — | Scotland |
| 40 | Le Grand Mann | 23 | Son | Printer | Utah |
Related Census Records
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)