MK
Mary Koch — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Lincoln-County, Nebraska
Our Model Tree links this Mary Koch across the 1930 and 1940 US Censuses in Lincoln-County, Nebraska (XGBoost, ~Confirmed) — first a head (b.~1895), then head of a 6-person household.
Age 45
b. ~1895
Female
Head
Born: Nebraska
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Lincoln-County, Nebraska |
| Surname | Koch |
| Given Name | Mary A |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 45 |
| Marital Status | Widowed |
| Birthplace | Nebraska |
| 1935 Residence (City) | North Platte City |
| Additional Details | |
| Occupation | House work |
| Industry | Private family |
| Class of Worker | PW |
| Hours Worked | 46 |
| Income (1939) | 468 |
| Highest Grade | H 4 |
| Birth State | Nebraska |
| Birth Country | United States |
| Birthplace (normalized) | nebraska |
| Occupation | House Work |
| Township / Ward | North Platte City |
| Est. Birth Year | ~1895 |
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 |
|---|---|---|---|---|
| Esther Koch | Daughter | — | 13 | ~1927 |
| Lillian Koch | Daughter | — | 18 | ~1922 |
| Mildred Koch | Daughter | — | 16 | ~1924 |
| Ruth Koch | Daughter | — | 21 | ~1919 |
| Mary Koch | Head | — | 45 | ~1895 |
| William Koch | Son | — | 19 | ~1921 |
Census Appearances
1930
Lincoln, Nebraska
Other, age 34
Lincoln, Nebraska · implied b. ~1896 — 8 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 | 34 |
| Marital Status | Married |
| Birthplace | Nebraska |
| Age at First Marriage | 23 |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Nebraska |
| Birth Country | United States |
| Birthplace (normalized) | nebraska |
1940
Lincoln-County, Nebraska
Head, age 45
Lincoln-County, Nebraska · implied b. ~1895 — 6 household members
| Surname | Koch |
| Given Name | Mary A |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 45 |
| Marital Status | Widowed |
| Birthplace | Nebraska |
| 1935 Residence (City) | North Platte City |
| Occupation | House work |
| Industry | Private family |
| Class of Worker | PW |
| Hours Worked | 46 |
| Income (1939) | 468 |
| Highest Grade | H 4 |
| Birth State | Nebraska |
| Birth Country | United States |
| Birthplace (normalized) | nebraska |
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
Head · 1940 · age 45 · b. ~1895 · Nebraska
★ 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 — Lincoln-County, Nebraska
Open full size
1940 US Federal Census — Lincoln-County, Nebraska
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02256-00456)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Dorothy Westphal | 14 | daughter | — | Nebraska |
| 42 | William T Smith | 61 | Head | Repairman | Iowa |
| 43 | Stella A Smith | 57 | wife | — | Nebraska |
| 44 | Roy W Smith | 20 | son | Pin Setter | Nebraska |
| 45 | George H Borron | 35 | Head | Salesman | Missouri |
| 46 | Hilda Gerlach | 34 | lodger | Canning App | Nebraska |
| 47 | Ronald Gerlach | 8 | lodger | — | Kansas |
| 48 | Harlin Gerlach | 11 | lodger | — | Nebraska |
| 49 | Edwin Isaac | 22 | lodger | Common Laborer | Nebraska |
| 50 | Mary A Koch THIS PERSON | 45 | Head | House Work | Nebraska |
| 51 | Ruth Koch | 21 | daughter | Stenographer | Nebraska |
| 52 | William A Koch | 19 | son | Call Boy | Nebraska |
| 53 | Lillian Koch | 18 | daughter | Bookkeeper | Nebraska |
| 54 | Mildred Koch | 16 | daughter | — | Nebraska |
| 55 | Esther Koch | 13 | daughter | — | Nebraska |
| 56 | Allen E Austen | 42 | Head | Welder | Nebraska |
| 57 | Minna Austen | 33 | wife | — | Nebraska |
| 58 | Constance Austen | 11 | daughter | — | Nebraska |
| 59 | Allen W Austen | 9 | son | — | Nebraska |
| 60 | Robert D Austen | 2 | son | — | Nebraska |
| 61 | Douglas D Austen | 0 | son | — | Nebraska |
| 62 | Nels D Winters | 50 | Head | Locomotive Engineer | Nebraska |
| 63 | Edna E Winters | 47 | wife | — | Nebraska |
| 64 | Lucius J Dean | 61 | Head | Locomotive Engineer | Ohio |
| 65 | Alberta J Dean | 61 | wife | — | Tennessee |
| 66 | Clarence H Dorser | 58 | Head | Machinist | Missouri |
| 67 | Jennie B Dorser | 50 | wife | — | Nebraska |
| 68 | Pauline Dorser | 21 | daughter | — | Washington |
| 69 | Bale H Mcmichael | 25 | Head | Repairman | Nebraska |
| 70 | Laverne Mcmichael | 25 | wife | — | Nebraska |
| 71 | Gary G Mcmichael | 3 | son | — | Nebraska |
| 72 | Joseph D Mcmichael | 2 | son | — | Nebraska |
| 73 | Thomas E Smith | 37 | Head | Salesman | Nebraska |
| 74 | Anna E Smith | 37 | wife | — | Nebraska |
| 75 | Thomas E Smith | 16 | son | — | Nebraska |
| 76 | Bruce H Smith | 13 | son | — | Nebraska |
| 77 | Phillis J Smith | 12 | daughter | — | Nebraska |
| 78 | Emily G Mitchner | 33 | Head | Hotel | Illinois |
| 79 | Edna E Mitchner | 14 | daughter | — | Nebraska |
| 80 | Glenn L Mitchner | 11 | son | — | Nebraska |
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)