JM
John Mckay — 1940 US Census Record
Model Tree available1940 United States Federal Census · Valley-County, Montana
Our Model Tree links this John Mckay across the 1920, 1930 and 1940 US Censuses in Valley-County, Montana (XGBoost, ~Confirmed), with identified parents Donald & John — first a head (b.~1914), then head of a 3-person household.
Age 26
b. ~1914
Male
Head
Born: Washington
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Valley-County, Montana |
| Surname | McKay |
| Given Name | John A. Jr. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Married |
| Birthplace | Washington |
| 1935 Residence (City) | Park Grove |
| 1935 Residence (County) | Valley |
| Additional Details | |
| Occupation | Truck driver |
| Industry | Earth dam construction |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 1450 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
| Occupation | Truck Driver |
| Township / Ward | Park Grove |
| Est. Birth Year | ~1914 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Mckay | Head | — | 26 | ~1914 |
| Wilma Mckay | Spouse | — | 22 | ~1918 |
| Kay Mckay | Daughter | — | 2 | ~1938 |
Census Appearances
1920
Phillips, Montana
Son, age 7
Phillips, Montana · implied b. ~1913 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McKay |
| Given Name | John G. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Washington |
| Father's Birthplace | Canada |
| Mother's Birthplace | Kansas |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
1930
Valley, Montana
Son, age 17
Valley, Montana · implied b. ~1913 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McKay |
| Given Name | John A. Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Washington |
| Father's Birthplace | Canada-English |
| Mother's Birthplace | Kansas |
| Can Read/Write | Yes |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
1940
Valley-County, Montana
Head, age 26
Valley-County, Montana · implied b. ~1914 — 3 household members
| Surname | McKay |
| Given Name | John A. Jr. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Married |
| Birthplace | Washington |
| 1935 Residence (City) | Park Grove |
| 1935 Residence (County) | Valley |
| Occupation | Truck driver |
| Industry | Earth dam construction |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 1450 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
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 Mckay across 3 US Census years (1920, 1930 and 1940) in 3 locations, using XGBoost record linkage. Identified parents: father Donald Mckay (~0.92 confidence) and father John Mckay (~0.92 confidence) and mother Minnie Mckay (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Donald Mckay
b. ~1880
Source father
● Household
· direct · ~0.92
Father
John Mckay
b. ~1881
Source father
● Household
· direct · ~0.92
Mother
Minnie Mckay
b. ~1882
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Mckay
Head · 1940 · age 26 · b. ~1914 · Montana
★ 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 — Valley-County, Montana
Open full size
1940 US Federal Census — Valley-County, Montana
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02233-00469)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Viola C. Mckay | 59 | Wife | — | Kansas |
| 2 | Leslie A. Mckay | 20 | Son | Handyman | Montana |
| 3 | Leonard E. Mckay | 17 | Son | — | Montana |
| 4 | John A. Jr. Mckay THIS PERSON | 26 | Head | Truck Driver | Washington |
| 5 | Wilma E. Mckay | 22 | Wife | — | Montana |
| 6 | Kay E. Mckay | 2 | Daughter | — | Montana |
| 7 | James D. Tade | 44 | Head | Carpenter Helper | Illinois |
| 8 | Grace C. Tade | 39 | Wife | — | Montana |
| 9 | Joanne L. Tade | 13 | Daughter | — | Montana |
| 10 | John D. Tade | 9 | Son | — | Montana |
| 11 | Mary E. Tade | 7 | Daughter | — | Montana |
| 12 | Paul C. Edstrom | 36 | Head | Electrical Worker | Minnesota |
| 13 | Anne E. Edstrom | 31 | Wife | — | Montana |
| 14 | Ronald R. Edstrom | 11 | Son | — | Montana |
| 15 | Delores L. Edstrom | 10 | Daughter | — | Montana |
| 16 | Joel B. Mahlen | 31 | Head | Laborer | Dakota |
| 17 | Mabel C. Mahlen | 26 | Wife | — | Montana |
| 18 | Eunice D. Mahlen | 4 | Daughter | — | Montana |
| 19 | Ralph E. Mahlen | 1 | Son | — | Montana |
| 20 | Arlene J. Mahlen | 0 | Daughter | — | Montana |
| 21 | Richard Whitney | 31 | Head | Truck Driver | Dakota |
| 22 | Elizabeth C. Whitney | 34 | Wife | — | Illinois |
| 23 | Peter M. Penner | 47 | Head | Deck Hand | Russia |
| 24 | Mary Penner | 42 | Wife | — | England |
| 25 | Susie Penner | 19 | Daughter | — | Dakota |
| 26 | Peter D. Penner | 17 | Son | Farm Worker | Dakota |
| 27 | Isaac H. Penner | 14 | Son | — | Dakota |
| 28 | John H. Penner | 9 | Son | — | Dakota |
| 29 | Sarah Penner | 4 | Daughter | — | Montana |
| 30 | Ernest H. Romsbecken | 41 | Head | Welder Helper | Minnesota |
| 31 | Mildred L. Romsbecken | 28 | Wife | — | Minnesota |
| 32 | Constance L. Romsbecken | 12 | Daughter | — | Montana |
| 33 | Ramona S. Romsbecken | 10 | Daughter | — | Montana |
| 34 | Arlene M. Romsbecken | 3 | Daughter | — | Montana |
| 35 | Herbert Brynjildson | 52 | Head | Proprietor | Minnesota |
| 36 | Myrtle J. Brynjildson | 41 | Wife | Clerk | Wisconsin |
| 37 | Herbert Brynjildson | 16 | Son | — | Montana |
| 38 | Vivian R. Brynjildson | 9 | Daughter | — | Montana |
| 39 | Adrian D. Culver | 38 | Head | Pump Operator | Wisconsin |
| 40 | Emma Culver | 38 | Wife | — | South Dakota |
Pedigree Summary
John
Gen 1 · 3 parents
~0.92
Max depth 4 (1900–1950 window)
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)