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John Brennan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Dakota-County, Minnesota
Our Model Tree links this John Brennan across the 1920, 1930 and 1940 US Censuses in Dakota-County, Minnesota (XGBoost, ~Confirmed) — first a head (b.~1868), then head of a 5-person household.
Age 72
b. ~1868
Male
Head
Born: Minnesota
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Dakota-County, Minnesota |
| Surname | Brennan |
| Given Name | John M. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 72 |
| Marital Status | Married |
| Birthplace | Minnesota |
| 1935 Residence (City) | Marshan Twp |
| 1935 Residence (County) | Dakota |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 60 |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Minnesota |
| Birth Country | United States |
| Birthplace (normalized) | minnesota |
| Occupation | Farmer |
| Township / Ward | Marshan Twp |
| Est. Birth Year | ~1868 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Brennan | Head | — | 72 | ~1868 |
| Russell Robinson | Other | — | 21 | ~1919 |
| Roy Brennan | Son | — | 32 | ~1908 |
| Augusta Brennan | Spouse | — | 61 | ~1879 |
| Jennie Robinson | Spouse | — | 18 | ~1922 |
Census Appearances
1920
Dakota, Minnesota
Head, age 52
Dakota, Minnesota · implied b. ~1868 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brennan |
| Given Name | John M. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 52 |
| Marital Status | Married |
| Birthplace | Minnesota |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Farmer |
| Industry | General Farm |
| Class of Worker | Emp |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth State | Minnesota |
| Birth Country | United States |
| Year of Naturalization | M |
| Birthplace (normalized) | minnesota |
1930
Dakota, Minnesota
Head, age 62
Dakota, Minnesota · implied b. ~1868 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brennan |
| Given Name | John M. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 62 |
| Marital Status | Married |
| Birthplace | Minnesota |
| Age at First Marriage | 27 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Minnesota |
| Occupation | Farmer |
| Industry | General Farm |
| Class of Worker | OA |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | yes |
| Radio Set | R |
| Veteran | No |
| Birth State | Minnesota |
| Birth Country | United States |
| Birthplace (normalized) | minnesota |
1940
Dakota-County, Minnesota
Head, age 72
Dakota-County, Minnesota · implied b. ~1868 — 5 household members
| Surname | Brennan |
| Given Name | John M. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 72 |
| Marital Status | Married |
| Birthplace | Minnesota |
| 1935 Residence (City) | Marshan Twp |
| 1935 Residence (County) | Dakota |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 60 |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| 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 Brennan across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
John Brennan
Head · 1940 · age 72 · b. ~1868 · Minnesota
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Dakota-County, Minnesota
Open full size
1940 US Federal Census — Dakota-County, Minnesota
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01917-00518)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | James Riley | 17 | Son | — | Minnesota |
| 2 | Martin Bohnert | 79 | Lodger | — | Hungary |
| 3 | Charles B. Isaacson | 70 | Head | Farmer | Minnesota |
| 4 | Elizabeth Isaacson | 68 | Wife | House Keeper | Minnesota |
| 5 | George Isaacson | 31 | Son | Laborer | Minnesota |
| 6 | George Isaacson | 14 | Grandson | — | Minnesota |
| 7 | Edward B. Kiefer | 28 | Head | Farmer | Minnesota |
| 8 | Cecile Kiefer | 32 | Wife | House Keeper | Minnesota |
| 9 | John F. Rahn | 48 | Head | Farmer | Minnesota |
| 10 | Theresa Rahn | 47 | Wife | House Keeper | Minnesota |
| 11 | Delores Rahn | 17 | Daughter | — | Minnesota |
| 12 | Bernardine Rahn | 15 | Daughter | — | Minnesota |
| 13 | John F. Rahn | 11 | Son | — | Minnesota |
| 14 | Joseph Ramsay | 33 | Head | Feed Grinding | Minnesota |
| 15 | Margaret Ramsay | 28 | Wife | House Keeper | Minnesota |
| 16 | James Ramsay | 8 | Son | — | Minnesota |
| 17 | Dorothy Ramsay | 6 | Daughter | — | Minnesota |
| 18 | Donald Ramsay | 5 | Son | — | Minnesota |
| 19 | Joseph Ramsay | 4 | Son | — | Minnesota |
| 20 | Daniel D. Canniff | 54 | Head | Farmer | Minnesota |
| 21 | Elizabeth Canniff | 54 | Wife | House Keeper | Minnesota |
| 22 | James Canniff | 28 | Son | Laborer | Minnesota |
| 23 | Dorothy Canniff | 22 | Daughter | Laborer | Minnesota |
| 24 | Joseph Canniff | 20 | Son | Laborer | Minnesota |
| 25 | Thomas Canniff | 18 | Son | Laborer | Minnesota |
| 26 | Annette Canniff | 17 | Daughter | — | Minnesota |
| 27 | Byron A. Kingston | 56 | Head | Farmer | Minnesota |
| 28 | Marie Kingston | 42 | Wife | House Keeper | Minnesota |
| 29 | Thomas Kingston | 20 | Son | Laborer | Minnesota |
| 30 | Kenneth Kingston | 17 | Son | — | Minnesota |
| 31 | Mary E. Kingston | 14 | Daughter | — | Minnesota |
| 32 | John B. Kingston | 11 | Son | — | Minnesota |
| 33 | John M. Brennan THIS PERSON | 72 | Head | Farmer | Minnesota |
| 34 | Augusta Brennan | 61 | Wife | House Keeper | Minnesota |
| 35 | Roy B. Brennan | 32 | Son | Laborer | Minnesota |
| 36 | Russell Robinson | 21 | Laborer | — | Minnesota |
| 37 | Jennie Robinson | 18 | Wife | — | Michigan |
| 38 | Grant Rahn | 51 | Head | Farmer | Minnesota |
| 39 | Susanna Rahn | 50 | Wife | House Keeper | Minnesota |
| 40 | Aloysius Fox | 26 | Son-in-law | Salesman | 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)