MK
Mary Koch — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Morton-County, North Dakota
Our Model Tree links this Mary Koch across the 1930 and 1940 US Censuses in Morton-County, North Dakota (XGBoost, ~Confirmed) — first a spouse (b.~1885), then head of a 6-person household.
Age 55
b. ~1885
Female
Spouse
Born: Hungary
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Morton-County, North Dakota |
| Surname | Koch |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 55 |
| Marital Status | Married |
| Birthplace | Hungary |
| 1935 Residence (City) | Mandan |
| 1935 Residence (County) | Morton |
| Naturalization Status | Naturalized |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | No |
| 1935 Residence | Same place |
| Birth Country | Hungary |
| Birthplace (normalized) | hungary |
| Township / Ward | Mandan |
| Est. Birth Year | ~1885 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Ray Koch | Head | — | 54 | ~1886 |
| Laurence Koch | Son | — | 10 | ~1930 |
| Helen Koch | Daughter | — | 15 | ~1925 |
| Eleanor Koch | Daughter | — | 19 | ~1921 |
| Mary Koch | Spouse | — | 55 | ~1885 |
| Leonard Koch | Son | — | 13 | ~1927 |
Census Appearances
1930
Morton, North …
Other, age 45
Morton, North Dakota · implied b. ~1885 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Koch |
| Given Name | Mary |
| Relationship to Head | wife-H |
| Sex | F |
| Color / Race | White |
| Age | 45 |
| Marital Status | Married |
| Birthplace | Hungary |
| Naturalization Status | Naturalized |
| Year of Immigration | 1903 |
| Age at First Marriage | 20 |
| Father's Birthplace | Hungary |
| Mother's Birthplace | Hungary |
| Can Read/Write | Yes |
| Mother Tongue | German |
| Birth Country | Hungary |
| Birthplace (normalized) | hungary |
1940
Morton-County, North …
Spouse, age 55
Morton-County, North Dakota · implied b. ~1885 — 6 household members
| Surname | Koch |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 55 |
| Marital Status | Married |
| Birthplace | Hungary |
| 1935 Residence (City) | Mandan |
| 1935 Residence (County) | Morton |
| Naturalization Status | Naturalized |
| Income (1939) | 0 |
| Highest Grade | No |
| 1935 Residence | Same place |
| Birth Country | Hungary |
| Birthplace (normalized) | hungary |
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 Koch across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Koch
Spouse · 1940 · age 55 · b. ~1885 · North Dakota
★ 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 — Morton-County, North Dakota
Open full size
1940 US Federal Census — Morton-County, North Dakota
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03007-00572)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Lee C Dall | 41 | Head | Laborer | Romania |
| 2 | Rose Dall | 41 | Wife | — | Russia |
| 3 | Elizabeth Dall | 16 | Daughter | — | North Dakota |
| 4 | Ralph Dall | 13 | Son | — | North Dakota |
| 5 | Hazel Dall | 21 | Daughter-in-law | — | Russia |
| 6 | John M Boehm | 19 | Head | Laborer | North Dakota |
| 7 | Monica Boehm | 18 | Wife | — | North Dakota |
| 8 | George S Jorde | 33 | Head | Dental Technician | North Dakota |
| 9 | Alice Jorde | 26 | Wife | — | North Dakota |
| 10 | Donavon Jorde | 8 | Son | — | North Dakota |
| 11 | Wayne Jorde | 4 | Son | — | North Dakota |
| 12 | Karen Jorde | 1 | Daughter | — | North Dakota |
| 13 | Jacob N Bender | 53 | Head | Laborer | Russia |
| 14 | Mary Bender | 49 | Wife | — | South Dakota |
| 15 | Elizabeth Bender | 16 | Daughter | — | North Dakota |
| 16 | Leo Bender | 22 | Son | Repair Man | North Dakota |
| 17 | Lucas A Steckler | 27 | Head | Service Man | North Dakota |
| 18 | Betty Steckler | 26 | Wife | — | North Dakota |
| 19 | Terrance Steckler | 2 | Son | — | North Dakota |
| 20 | Peter Tooper | 55 | Head | Engineer | Russia |
| 21 | Isabell Tooper | 47 | Wife | Repair Work | Russia |
| 22 | John Tooper | 25 | Son | Truck Driver | Minnesota |
| 23 | Andy Tooper | 22 | Son | Helper | North Dakota |
| 24 | Lilly Tooper | 19 | Daughter | Houseworker | North Dakota |
| 25 | Andrew Gerser | 50 | Head | Laborer | Russia |
| 26 | Elizabeth Gerser | 47 | Wife | — | North Dakota |
| 27 | Genevieve Gerser | 21 | Daughter | Clerk | North Dakota |
| 28 | Kathryn Gerser | 19 | Daughter | Dental Assistant | North Dakota |
| 29 | Peter N Peterson | 50 | Head | Foreman | Russia |
| 30 | Nora Peterson | 46 | Wife | — | Russia |
| 31 | Roy N Peterson | 24 | Son | Clerk | North Dakota |
| 32 | Rosemary Peterson | 20 | Daughter | — | North Dakota |
| 33 | William Peterson | 15 | Son | — | North Dakota |
| 34 | Ray Koch | 54 | Head | Carpenter | Russia |
| 35 | Mary Koch THIS PERSON | 55 | Wife | — | Hungary |
| 36 | Eleanor Koch | 19 | Daughter | Housework | Montana |
| 37 | Helen Koch | 15 | Daughter | — | North Dakota |
| 38 | Leonard Koch | 13 | Son | — | North Dakota |
| 39 | Laurence Koch | 10 | Son | — | North Dakota |
| 40 | A. B. Curtis | 61 | Head | Brakeman | Wisconsin |
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)