MP
Mary Peterson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Mercer-County, North Dakota
Our Model Tree links this Mary Peterson across the 1920, 1930 and 1940 US Censuses in Mercer-County, North Dakota (XGBoost, ~Confirmed) — first a head (b.~1879), then head of a 3-person household.
Age 61
b. ~1879
Female
Head
Born: Germany
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Mercer-County, North Dakota |
| Surname | Peterson |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 61 |
| Marital Status | Widowed |
| Birthplace | Germany |
| 1935 Residence (City) | Twp 144-85 |
| 1935 Residence (County) | Mercer |
| Naturalization Status | Naturalized |
| Additional Details | |
| Industry | H |
| Class of Worker | 0 |
| Highest Grade | No 3 |
| 1935 Residence | Same place |
| Birth Country | Germany |
| Birthplace (normalized) | germany |
| Township / Ward | Twp 14485 |
| Est. Birth Year | ~1879 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Peterson | Head | — | 61 | ~1879 |
| Oswald Peterson | Son | — | 17 | ~1923 |
| Oscar Peterson | Son | — | 17 | ~1923 |
Census Appearances
1920
Mercer, North …
Spouse, age 41
Mercer, North Dakota · implied b. ~1879 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Peterson |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 41 |
| Marital Status | Married |
| Birthplace | Germany |
| Year of Immigration | 1884 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | German |
| Birth Country | Germany |
| Year of Naturalization | 1900 |
| Birthplace (normalized) | germany |
1930
Mercer, North …
Other, age 51
Mercer, North Dakota · implied b. ~1879 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Peterson |
| Given Name | Mary |
| Relationship to Head | mother-H |
| Sex | F |
| Color / Race | White |
| Age | 51 |
| Marital Status | Widowed |
| Birthplace | Germany |
| Naturalization Status | Naturalized |
| Year of Immigration | 1883 |
| Age at First Marriage | 31 |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Occupation | Farmer |
| Industry | General Farm |
| Class of Worker | VVVV |
| Can Read/Write | Yes |
| Mother Tongue | German |
| Home Owned/Rented | R |
| Birth Country | Germany |
| Birthplace (normalized) | germany |
1940
Mercer-County, North …
Head, age 61
Mercer-County, North Dakota · implied b. ~1879 — 3 household members
| Surname | Peterson |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 61 |
| Marital Status | Widowed |
| Birthplace | Germany |
| 1935 Residence (City) | Twp 144-85 |
| 1935 Residence (County) | Mercer |
| Naturalization Status | Naturalized |
| Industry | H |
| Class of Worker | 0 |
| Highest Grade | No 3 |
| 1935 Residence | Same place |
| Birth Country | Germany |
| Birthplace (normalized) | germany |
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 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Peterson
Head · 1940 · age 61 · b. ~1879 · North 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 — Mercer-County, North Dakota
Open full size
1940 US Federal Census — Mercer-County, North Dakota
Page Contents
35 people indexed on this census page (nara:1940:m-t0627-03007-00147)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Emma Frutty | 23 | Wife | — | North Dakota |
| 2 | Claude Martin | 35 | Head | Farmer | Illinois |
| 3 | Hilda Martin | 33 | Wife | — | North Dakota |
| 4 | Edgar Brusen | 60 | Head | Farmer | Kansas |
| 5 | Sadie Brusen | 54 | Wife | — | Indiana |
| 6 | Helen Brusen | 25 | Daughter | Teacher | North Dakota |
| 7 | Vada Brusen | 18 | Daughter | — | Washington |
| 8 | Mary Peterson THIS PERSON | 61 | Head | — | Germany |
| 9 | Oswald Peterson | 17 | Son | — | North Dakota |
| 10 | Oscar Peterson | 17 | Son | — | North Dakota |
| 11 | Emil Link | 25 | Head | Farmer | North Dakota |
| 12 | Ida Link | 26 | Wife | — | North Dakota |
| 13 | Doris Link | 4 | Daughter | — | North Dak. |
| 14 | Darleen Link | 2 | Daughter | — | North Dak. |
| 15 | Elias Berg | 72 | Head | Farmer | Norway |
| 16 | Selma Berg | 68 | Wife | — | Sweden |
| 17 | Hans Unruh | 33 | Son in law | Farm Laborer | Germany |
| 18 | Helen Unruh | 30 | Wife | — | North Dakota |
| 19 | W. A. Johnson | 67 | Head | Farmer | Sweden |
| 20 | Rinna Johnson | 61 | Wife | — | Sweden |
| 21 | Vivian Johnson | 32 | Daughter | Teacher | North Dakota |
| 22 | Vernon Johnson | 27 | Son | Farm Laborer | North Dakota |
| 23 | Vernice Johnson | 22 | Daughter | — | North Dakota |
| 24 | Charles Ford | 49 | Head | Farmer | Iowa |
| 25 | Eva Ford | 47 | Wife | — | Iowa |
| 26 | Dale Ford | 23 | Son | Farm Laborer | North Dakota |
| 27 | Jeanne Ford | 19 | Daughter | Teacher | North Dakota |
| 28 | Loren Ford | 5 | Son | — | North Dakota |
| 29 | Ruth Morris | 15 | Niece | — | North Dak. |
| 30 | Berenice Brown | 71 | Head | — | Pennsylvania |
| 31 | George Brown | 46 | Son | Farmer | Iowa |
| 32 | Lydell Brown | 44 | Son | Farmer | Iowa |
| 33 | John Teuber | 55 | Head | Farmer | Minnesota |
| 34 | Katie Teuber | 60 | Wife | — | Minnesota |
| 35 | Samuel Neuman | 38 | Head | Farmer | North 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)