JH
John Hahn — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Lake-County, South Dakota
Our Model Tree links this John Hahn across the 1930 and 1940 US Censuses in Lake-County, South Dakota (XGBoost, ~Confirmed) — first a head (b.~1900), then head of a 8-person household.
Age 40
b. ~1900
Male
Head
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Lake-County, South Dakota |
| Surname | Hahn |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Miner |
| 1935 Residence (County) | S. Dak. |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 80 |
| Income (1939) | 0 |
| Highest Grade | No 7 |
| 1935 Residence | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Farmer |
| Township / Ward | Orland Township |
| Est. Birth Year | ~1900 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Amos Hahn | Son | — | 15 | ~1925 |
| Ardyce Hahn | Daughter | — | 13 | ~1927 |
| Willard Hahn | Son | — | 7 | ~1933 |
| Frances Hahn | Spouse | — | 34 | ~1906 |
| Della Hahn | Daughter | — | 9 | ~1931 |
| Johnny Hahn | Son | — | 11 | ~1929 |
| Rodney Hahn | Son | — | 5 | ~1935 |
| John Hahn | Head | — | 40 | ~1900 |
Census Appearances
1930
Miner, South …
Head, age 30
Miner, South Dakota · implied b. ~1900 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hahn |
| Given Name | John A. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Married |
| Birthplace | Illinois |
| Age at First Marriage | 23 |
| Father's Birthplace | Germany |
| Mother's Birthplace | Illinois |
| Occupation | Farmer |
| Industry | General Farm |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Lake-County, South …
Head, age 40
Lake-County, South Dakota · implied b. ~1900 — 8 household members
| Surname | Hahn |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Miner |
| 1935 Residence (County) | S. Dak. |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 80 |
| Income (1939) | 0 |
| Highest Grade | No 7 |
| 1935 Residence | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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 John Hahn across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Hahn
Head · 1940 · age 40 · b. ~1900 · South 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 — Lake-County, South Dakota
Open full size
1940 US Federal Census — Lake-County, South Dakota
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03859-00767)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Hazel Hanson | 8 | daughter | — | S. Dak. |
| 2 | August Larson | 52 | Head | Farmer | Sweden |
| 3 | Gundborg Larson | 40 | wife | — | Sweden |
| 4 | Duane Larson | 16 | son | — | S. Dak. |
| 5 | Eileen Larson | 15 | daughter | — | S. Dak. |
| 6 | Ray Larson | 13 | son | — | S. Dak. |
| 7 | Russell Larson | 11 | son | — | S. Dak. |
| 8 | David Larson | 9 | son | — | S. Dak. |
| 9 | Carl Larson | 4 | son | — | S. Dak. |
| 10 | Martha Mae Larson | 1 | daughter | — | S. Dak. |
| 11 | Henry G. Johnson | 55 | Head | — | S. Dak. |
| 12 | Carrie Johnson | 54 | wife | — | Illinois |
| 13 | Dean Johnson | 20 | son | Farm Laborer | S. Dak. |
| 14 | Lorraine Johnson | 13 | daughter | — | S. Dak. |
| 15 | Mike Weber | 42 | Hired hand | Farm Laborer | Wisconsin |
| 16 | Chris J. Schmidt | 36 | Head | Farmer | S. Dak. |
| 17 | Palma Schmidt | 34 | wife | — | S. Dak. |
| 18 | Lloyd Schmidt | 11 | son | — | S. Dak. |
| 19 | Betty Schmidt | 10 | daughter | — | S. Dak. |
| 20 | Naomi Jean Schmidt | 6 | daughter | — | S. Dak. |
| 21 | Rosella Schmidt | 3 | daughter | — | S. Dak. |
| 22 | Joyce Schmidt | 1 | daughter | — | S. Dak. |
| 23 | Gus A. Johnson | 50 | Head | Farmer | Sweden |
| 24 | Bertha O. Johnson | 50 | wife | — | Sweden |
| 25 | Iver Johnson | 20 | son | Farm Laborer | S. Dak. |
| 26 | Ula Johnson | 16 | daughter | — | S. Dak. |
| 27 | Esther Johnson | 12 | daughter | — | S. Dak. |
| 28 | Duane Johnson | 10 | son | — | S. Dak. |
| 29 | Junior Johnson | 9 | son | — | S. Dak. |
| 30 | Clarence Frye | 34 | Head | Farmer | Iowa |
| 31 | Clara O. Frye | 26 | wife | — | S. Dak. |
| 32 | Ralph Edward Frye | 2 | son | — | S. Dak. |
| 33 | John Hahn THIS PERSON | 40 | Head | Farmer | Illinois |
| 34 | Frances Hahn | 34 | wife | — | S. Dak. |
| 35 | Amos Hahn | 15 | son | — | S. Dak. |
| 36 | Ardyce Hahn | 13 | daughter | — | S. Dak. |
| 37 | Johnny Hahn | 11 | son | — | S. Dak. |
| 38 | Della Hahn | 9 | daughter | — | S. Dak. |
| 39 | Willard Hahn | 7 | son | — | S. Dak. |
| 40 | Rodney Hahn | 5 | son | — | S. Dak. |
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)