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John Koch — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Ramsey-County, Minnesota
Our Model Tree links this John Koch across the 1930 and 1940 US Censuses in Ramsey-County, Minnesota (XGBoost, ~Confirmed) — first a son (b.~1922), then head of a 7-person household.
Age 18
b. ~1922
Male
Son
Born: Minnesota
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Ramsey-County, Minnesota |
| Surname | Koch |
| Given Name | John A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Minnesota |
| 1935 Residence (City) | Minneapolis |
| 1935 Residence (County) | Hennepin |
| Additional Details | |
| Hours Worked | 0 |
| Highest Grade | Hs 2 |
| 1935 Residence | Minnesota |
| Birth State | Minnesota |
| Birth Country | United States |
| Birthplace (normalized) | minnesota |
| Township / Ward | St Paul City |
| Est. Birth Year | ~1922 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Arthur Koch | Head | — | 44 | ~1896 |
| Robert Koch | Son | — | 21 | ~1919 |
| Josephine Koch | Spouse | — | 45 | ~1895 |
| Richard Koch | Son | — | 10 | ~1930 |
| Marion Koch | Daughter | — | 14 | ~1926 |
| William Koch | Son | — | 5 | ~1935 |
| John Koch | Son | — | 18 | ~1922 |
Census Appearances
1930
Hennepin, Minnesota
Son, age 7
Hennepin, Minnesota · implied b. ~1923 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Koch |
| Given Name | John E. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Minnesota |
| Father's Birthplace | Wisconsin |
| Mother's Birthplace | Wisconsin |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Minnesota |
| Birth Country | United States |
| Birthplace (normalized) | minnesota |
1940
Ramsey-County, Minnesota
Son, age 18
Ramsey-County, Minnesota · implied b. ~1922 — 7 household members
| Surname | Koch |
| Given Name | John A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Minnesota |
| 1935 Residence (City) | Minneapolis |
| 1935 Residence (County) | Hennepin |
| Hours Worked | 0 |
| Highest Grade | Hs 2 |
| 1935 Residence | Minnesota |
| Birth State | Minnesota |
| Birth Country | United States |
| Birthplace (normalized) | minnesota |
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 Koch across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Koch
Son · 1940 · age 18 · b. ~1922 · Minnesota
★ You are viewing this record
Sibling
Marion Koch
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Koch
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Koch
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Richard Koch
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Ramsey-County, Minnesota
Open full size
1940 US Federal Census — Ramsey-County, Minnesota
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02002-00474)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | James H. Eppel | 20 | Son | Clerk | Minnesota |
| 42 | Mary G. Eppel | 19 | Daughter | — | Minnesota |
| 43 | Thomas B. Bann | 45 | Head | Salesman | Saskatchewan |
| 44 | Ruth H. Bann | 40 | Wife | — | Wisconsin |
| 45 | Thomas J. Bann | 24 | Son | Truck Driver | Minnesota |
| 46 | Audrey M. Peterson | 22 | Daughter | Cashier | Minnesota |
| 47 | George E. Zylka | 55 | Head | Clerk | Minnesota |
| 48 | Elizabeth D. Zylka | 54 | Wife | — | England |
| 49 | Dorothy M. Zylka | 21 | Daughter | Clerical | Minnesota |
| 50 | Harry G. Christiansen | 28 | Head | Laborer | Minnesota |
| 51 | Arlene L. Christiansen | 26 | Wife | — | Minnesota |
| 52 | Lois J. Christiansen | 3 | Daughter | — | Minnesota |
| 53 | Joel Butwinick | 25 | Head | Owner | Minnesota |
| 54 | Elsie A. Butwinick | 25 | Wife | — | New York |
| 55 | Gerald S. Butwinick | 1 | Son | — | Minnesota |
| 56 | Pearl H. Hawi | 17 | Servant | Housework | Minnesota |
| 57 | William M. Carey | 72 | Head | Guard | Eire |
| 58 | Vinnie Carey | 83 | Wife | — | Eire |
| 59 | John V. Casey | 61 | Head | Landscaper | Iowa |
| 60 | Ellaberne Casey | 46 | Wife | — | Minnesota |
| 61 | Vincent P. Casey | 27 | Son | Landscaper | So. Dakota |
| 62 | Clinton P. Casey | 25 | Son | Clerk | So. Dakota |
| 63 | Frances E. Casey | 21 | Daughter | — | So. Dakota |
| 64 | Walter J. Kennedy | 45 | Head | Doctor | Minnesota |
| 65 | Katherine C. Kennedy | 16 | Niece | — | Minnesota |
| 66 | Gustave A. Nelson | 50 | Head | Installer | Minnesota |
| 67 | Hattie K. Nelson | 49 | Wife | — | Minnesota |
| 68 | Edward A. Nelson | 22 | Son | — | Minnesota |
| 69 | Robert K. Nelson | 19 | Son | — | Minnesota |
| 70 | Halleck Marker | 44 | Head | Clerk | Minnesota |
| 71 | Helen E. Marker | 45 | Wife | — | Minnesota |
| 72 | Donald Marker | 19 | Son | Attendant | Minnesota |
| 73 | Arthur J. Koch | 44 | Head | Owner | Minnesota |
| 74 | Josephine E. Koch | 45 | Wife | — | Minnesota |
| 75 | Robert A. Koch | 21 | Son | Apprentice | Minnesota |
| 76 | John A. Koch THIS PERSON | 18 | Son | — | Minnesota |
| 77 | Marion E. Koch | 14 | Daughter | — | Minnesota |
| 78 | Richard S. Koch | 10 | Son | — | Minnesota |
| 79 | William A. Koch | 5 | Son | — | Minnesota |
| 80 | Godfrey Pearson | 54 | Head | Salesman | Sweden |
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)