JK
John Knapp — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Aitkin-County, Minnesota
Our Model Tree links this John Knapp across the 1930 and 1940 US Censuses in Aitkin-County, Minnesota (XGBoost, ~Confirmed) — first a head (b.~1891), then head of a 7-person household.
Age 49
b. ~1891
Male
Head
Born: Pennsylvania
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Aitkin-County, Minnesota |
| Surname | Knapp |
| Given Name | John G. B. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 49 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Macville Township |
| 1935 Residence (County) | Aitkin |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 40 |
| Income (1939) | 0 |
| Highest Grade | 7 |
| 1935 Residence | Same house |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Farmer |
| Township / Ward | Macville Township |
| Est. Birth Year | ~1891 |
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 |
|---|---|---|---|---|
| Josephine Knapp | Daughter | — | 47 | ~1893 |
| Mildred Knapp | Daughter | — | 23 | ~1917 |
| Joseph Knapp | Son | — | 19 | ~1921 |
| John Knapp | Head | — | 49 | ~1891 |
| Lola Knapp | Daughter | — | 11 | ~1929 |
| Marlene Knapp | Daughter | — | 9 | ~1931 |
| Robert Knapp | Son | — | 11 | ~1929 |
Census Appearances
1930
Aitkin, Minnesota
Head, age 39
Aitkin, Minnesota · implied b. ~1891 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Knapp |
| Given Name | John A. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 39 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| Age at First Marriage | 22 |
| Father's Birthplace | New York |
| Mother's Birthplace | Pennsylvania |
| Occupation | Attendant |
| Industry | Oil Station |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Aitkin-County, Minnesota
Head, age 49
Aitkin-County, Minnesota · implied b. ~1891 — 7 household members
| Surname | Knapp |
| Given Name | John G. B. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 49 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Macville Township |
| 1935 Residence (County) | Aitkin |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 40 |
| Income (1939) | 0 |
| Highest Grade | 7 |
| 1935 Residence | Same house |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
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 Knapp across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Knapp
Head · 1940 · age 49 · b. ~1891 · Minnesota
★ 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 — Aitkin-County, Minnesota
Open full size
1940 US Federal Census — Aitkin-County, Minnesota
Page Contents
20 people indexed on this census page (nara:1940:m-t0627-01903-00379)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Ann Dougherty | 8 | Daughter | — | Minnesota |
| 42 | Aretha Dougherty | 6 | Daughter | — | Minnesota |
| 43 | Clyde Stansberry | 30 | Head | Farmer | Minnesota |
| 44 | Viola Stansberry | 33 | Wife | — | Minnesota |
| 45 | Caroline Stansberry | 5 | Daughter | — | Minnesota |
| 46 | Evelyn Stansberry | 2 | Daughter | — | Minnesota |
| 47 | John G. B. Knapp THIS PERSON | 49 | Head | Farmer | Pennsylvania |
| 48 | Josephine Knapp | 47 | Daughter | — | New York |
| 49 | Mildred L. Knapp | 23 | Daughter | Seamstress | Virginia |
| 50 | Joseph A. Knapp | 19 | Son | Farmer | New York |
| 51 | Lola Mae Knapp | 11 | Daughter | — | Minnesota |
| 52 | Robert J. Knapp | 11 | Son | — | Minnesota |
| 53 | Marlene Knapp | 9 | Daughter | — | Minnesota |
| 54 | Elmer D. Snakenberg | 50 | Head | Farmer | Iowa |
| 55 | Maude Snakenberg | 50 | Wife | — | Iowa |
| 56 | Jewell Francis Snakenberg | 3 | Daughter | — | Minnesota |
| 57 | Thomas Francis Snakenberg | 81 | Father | — | Iowa |
| 58 | Lloyd R. Wickham | 28 | Head | Laborer | Minnesota |
| 59 | Mabel Wickham | 20 | Wife | — | Minnesota |
| 60 | Duane Wickham | 1 | Son | — | Minnesota |
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)